JP2013212954A - Reforming system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reforming system enabling the arrival time of a reforming catalyst at a refomable temperature to be further shortened, which is superior also from the standpoint of power consumption.SOLUTION: There is provided a reforming system having a reformer for generating hydrogen by taking in a hydrogen system fuel at least containing hydrogen as a constituent together with air in mixed-gas form from an inlet part. The reformer includes a reforming catalyst for modifying the hydrogen system fuel to generate hydrogen and an oxidizing catalyst disposed on the upper stream side than the reforming catalyst to oxidize in the presence of oxygen. In the reforming system, there are provided a heat exchanger disposed on the farther downstream side than the reformer to heat-exchange with a modified gas generated by modifying the mixed gas, a heat accumulator for accumulating the heat moved from the modified gas by means of the heat exchanger, and a catalyst temperature raising unit for promoting a temperature rise in the oxidizing catalyst by utilizing the heat stored in the heat accumulator.

Description

  In order to generate hydrogen to be supplied to a fuel cell, an intake / exhaust system of an internal combustion engine, etc., hydrogen is generated by introducing a hydrogen-based fuel containing at least hydrogen as a constituent component with air as a mixed gas from an inlet portion. A reformer comprising a reforming catalyst that reforms the hydrogen-based fuel to generate hydrogen, and an oxidation catalyst that is disposed upstream of the reforming catalyst and oxidizes in an oxygen atmosphere. The present invention relates to a reforming system including a quality device.

  In recent years, a part of a mixed gas containing hydrogen fuel and air is oxidized by a catalyst (hereinafter referred to as an oxidation catalyst) that performs an oxidation reaction provided on the upstream side of the reformer, and the heat of reaction is used to internalize the gas. Development of a so-called autothermal reformer that promotes the reforming reaction by raising the temperature of the catalyst that performs the reforming reaction (hereinafter referred to as a reforming catalyst) has been underway. One of the problems in such a reformer is that the reforming reaction in the reforming catalyst occurs when the reforming catalyst temperature is raised to a high temperature, so that a considerable time is required for raising the reforming catalyst temperature. In other words, there is a problem that the startability of an apparatus (for example, an internal combustion engine) that requires supply of hydrogen gas may be hindered.

  As a means for solving such a problem, a heating element that generates heat by energization is arranged upstream of the reforming catalyst in order to accelerate the reforming reaction and shorten the time required to generate hydrogen gas. A reforming apparatus having a configuration in which catalyst particles that exothermically react with an introduced mixed gas are supported on the heating element, that is, a so-called electric heating catalyst (EHC) is disposed upstream of the reforming catalyst is known. (See Patent Document 1). According to such a reformer configuration, the heating element itself is heated by energization of the heating element, and the catalyst particles carried on the heating element are heated, and the catalyst particles and the mixed gas taken in are mixed. The exothermic reaction of the catalyst is promoted, and the temperature of the oxidation catalyst and the reforming catalyst can be quickly raised by the heated mixed gas, and the time required for the reforming catalyst to reach the reformable temperature can be shortened. It can be.

JP 2002-154805 A JP 2007-278244 A

  By the way, the technical field where the application of the above-described autothermal reformer is expected is expanding, and there is a demand for further shortening the time required for the reforming catalyst to reach the reformable temperature. As a solution to this demand, a heat accumulator that can receive heat supply in advance and store heat is configured, and if necessary, oxidation is performed using the heat stored in the heat accumulator. It is conceivable that the time required for the reforming catalyst to reach the reformable temperature can be shortened by rapidly raising the temperature of the catalyst to a predetermined temperature. Here, as a method of storing heat in the regenerator, it may be possible to use an additional electric heating source, but in the case where heat storage to the regenerator is performed using an additional electric heating source, There may be cases where it will cause trouble in terms of consumption.

  In view of the above problems, the present invention is a reformer that takes in a hydrogen-based fuel containing at least hydrogen as a constituent component together with air as a mixed gas from an inlet portion to generate hydrogen, and reforms the hydrogen-based fuel to generate hydrogen. In a reforming system including a reforming catalyst having a reforming catalyst that generates oxygen and an oxidation catalyst that is disposed upstream of the reforming catalyst and oxidizes in an oxygen atmosphere, the heat supply is received in advance. By arranging the heat accumulator that can store heat, it is possible to further shorten the time required for the reforming catalyst to reach the reformable temperature, and it is also excellent in terms of power consumption. An object is to provide a reforming system.

  According to the first aspect of the present invention, there is provided a reformer for generating hydrogen by introducing a hydrogen-based fuel containing at least hydrogen as a constituent component together with air as a mixed gas from an inlet portion, and reforming the hydrogen-based fuel. A reforming system comprising a reforming catalyst having a reforming catalyst that generates hydrogen by reforming and an oxidation catalyst that is disposed upstream of the reforming catalyst and oxidizes in an oxygen atmosphere. A heat exchanger disposed downstream of the heat exchanger, the heat exchanger exchanging heat with the reformed gas generated by reforming the mixed gas, and the reformed gas by the heat exchanger. There is provided a reforming system comprising a heat accumulator for accumulating the heat transferred from and a catalyst temperature raising means for promoting the temperature rise of the oxidation catalyst using the heat accumulated in the heat accumulator.

  By the way, since the reformed gas generated and released in the reformer as described above is generally in an extremely high temperature state such as 500 ° C., the adverse effect on the apparatus to which the reformed gas is supplied is taken into consideration. In addition, there is known a system in which a heat exchanger is disposed between a reformer-supplied apparatus and a reformer to cool the reformed gas (see Patent Document 2). In such a configuration, if the heat transferred from the reformed gas in a high temperature state can be used for heat storage as described above, it is necessary to store heat in the heat accumulator with an additional electric heating source. Therefore, it is possible to shorten the time required for the reforming catalyst to reach the reformable temperature, and to provide a reforming system that is excellent in terms of power consumption.

  Based on this, the invention according to claim 1 is a reformer that generates hydrogen by taking in hydrogen-based fuel as a mixed gas together with air from an inlet, and has a reforming catalyst and an oxidation catalyst. In a reforming system including a reactor, heat exchange is performed with the reformed gas generated by reforming the mixed gas, that is, the reformed gas is cooled by transferring heat from the reformed gas in a high temperature state. A heat exchanger is disposed downstream of the reformer. A heat accumulator for accumulating heat transferred from the reformed gas by the heat exchanger; and a catalyst temperature raising means for promoting the temperature rise of the oxidation catalyst using the heat accumulated in the heat accumulator. With this configuration, the heat necessary for raising the temperature of the oxidation catalyst is stored, and if necessary, the temperature of the oxidation catalyst can be quickly raised to a predetermined temperature by the stored heat. It is possible to shorten the time required for the quality catalyst to reach the reformable temperature. In Patent Document 2, the structure of the present invention, that is, moved from a high-temperature reformed gas so as to be able to quickly raise the temperature of the oxidation catalyst to a predetermined temperature as necessary. There is no disclosure or suggestion of a configuration for storing heat in the regenerator.

  According to the invention of claim 2, the catalyst temperature raising means is a case where the temperature of the oxidation catalyst is lower than a predetermined temperature, and the temperature of the oxidation catalyst needs to be raised to a predetermined temperature. A circulation path is formed in which the residual gas remaining in the reformer can be circulated between the reformer and the heat accumulator, and the residual gas is circulated in the circulation path to the heat accumulator. The reforming system according to claim 1, wherein the residual gas is heated by the stored heat, and the oxidation catalyst is heated by the heated residual gas.

  According to the invention of claim 3, the catalyst temperature raising means is a case where the temperature of the oxidation catalyst is lower than a predetermined temperature, and the temperature of the oxidation catalyst needs to be raised to a predetermined temperature. The heat medium is heated by the heat stored in the heat accumulator, the heated heat medium is circulated between the inlet of the reformer and the heat accumulator, and the heated heat medium 2. The reforming system according to claim 1, wherein the mixed gas taken in from an inlet portion of the reformer is heated, and the temperature of the oxidation catalyst is raised by the heated mixed gas.

  According to the invention of claim 4, the catalyst temperature raising means is a case where the temperature of the oxidation catalyst is lower than a predetermined temperature, and the temperature of the oxidation catalyst needs to be raised to a predetermined temperature. A fuel detour is formed to supply the hydrogen fuel to the reformer via the heat accumulator, the hydrogen fuel is supplied to the fuel detour, and the heat accumulated in the heat accumulator 2. The reforming system according to claim 1, wherein a hydrogen-based fuel is heated, and the temperature of the oxidation catalyst is increased by the heated hydrogen-based fuel.

  According to the invention of claim 5, the catalyst temperature raising means is a case where the temperature of the oxidation catalyst is lower than a predetermined temperature, and the temperature of the oxidation catalyst needs to be raised to a predetermined temperature. A heat medium is heated by heat stored in the heat accumulator, the heated heat medium is circulated between the oxidation catalyst and the heat accumulator, and the oxidation catalyst is circulated by the heated heat medium. A reforming system according to claim 1, wherein the temperature is increased.

  According to a sixth aspect of the present invention, the catalyst temperature raising means includes an electric heating heater that is disposed in a circulation path through which the heat medium circulates and can supplementarily heat the heat medium. Is provided.

  According to the invention described in each claim, a reformer that takes in hydrogen-based fuel as a mixed gas together with air from an inlet to generate hydrogen, and is disposed upstream of the reforming catalyst and the reforming catalyst. In a reforming system including a reformer having an oxidation catalyst provided, a heat accumulator that can store heat by receiving heat transferred from a high-temperature reformed gas by a heat exchanger is arranged. Thus, it is possible to further shorten the time required for the reforming catalyst to reach the reformable temperature, and to provide an excellent reforming system in terms of power consumption. Has a common effect.

It is a figure which shows one Embodiment of the whole structure of the reforming system of this invention. It is a flowchart which shows one Embodiment of the catalyst temperature rising control in the reforming system of embodiment shown by FIG. It is a figure which shows another one Embodiment of the whole structure of the reforming system of this invention. It is a flowchart which shows one Embodiment of the catalyst temperature rising control in the reforming system of embodiment shown by FIG. It is a figure which shows another one Embodiment of the whole structure of the reforming system of this invention. It is a flowchart which shows one Embodiment of the catalyst temperature rising control in the reforming system of embodiment shown by FIG. It is a figure which shows another one Embodiment of the whole structure of the reforming system of this invention. It is a figure which shows another one Embodiment of the whole structure of the reforming system of this invention. It is a figure which shows one Embodiment of the thermal storage in the reforming system of this invention. It is a figure which shows another one Embodiment of the heat storage in the reforming system of this invention. It is a figure which shows another one Embodiment of the heat storage in the reforming system of this invention. It is a figure which shows one Embodiment of the reforming system in a prior art.

  Hereinafter, embodiments of a reforming system according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a diagram showing an embodiment of the overall configuration of a reforming system of the present invention. The reforming system shown in FIG. 1 supplies reformed gas generated by a reformer to an internal combustion engine. It is comprised as follows. In FIG. 1, 1 is a reformer, 2 is a reforming catalyst, 3 is an oxidation catalyst, 4 is an electrically heated heater, 5 is a heat exchanger, 14 is a reformer inlet valve, 15 is a reformer outlet valve, Reference numeral 16 denotes a reformer fuel injector, 21 denotes a heat accumulator, 22 denotes a circulation pump, 23 denotes a first valve for circulation path, and 24 denotes a second valve for circulation path. In the intake system in the internal combustion engine 13, a throttle valve 12, an air flow meter 11 for measuring the intake air amount adjusted by the throttle valve 12, and an engine fuel injector 17 for injecting fuel into the intake system are arranged. Is done.

  A reformer 1 in the embodiment shown in FIG. 1 is a reformer that generates hydrogen by reforming a hydrogen-based fuel containing at least hydrogen as a constituent component, and reforms the hydrogen-based fuel to produce hydrogen. A reforming catalyst 2 that generates oxygen, an oxidation catalyst 3 that is disposed upstream of the reforming catalyst 2 and performs oxidation such as partial oxidation or complete oxidation in an oxygen atmosphere, and the reforming catalyst 2 and the oxidation catalyst 3 And an exterior casing housed inside. The exterior casing includes an inlet portion for taking in hydrogen-based fuel as a mixed gas together with air from an upstream passage disposed upstream of the oxidation catalyst 3, and the generated reformed gas from the reforming catalyst 2. An outlet portion that discharges to a downstream passage disposed on the downstream side and an outer peripheral wall portion that surrounds the outer periphery of the reforming catalyst 2 and the oxidation catalyst 3 are configured. Further, in the embodiment shown in FIG. 1, electric heating that promotes the temperature rise of the oxidation catalyst 3 by heating the mixed gas introduced from the inlet portion inside the outer casing and upstream of the oxidation catalyst 3. A type heater 4 is provided.

  The reforming catalyst 2 plays a role of reforming the hydrogen-based fuel taken from the upstream flow path to generate hydrogen, and catalyst particles for reforming the hydrogen-based fuel are arranged. The reforming catalyst 2 in the present embodiment is formed in a honeycomb structure and has a plurality of flow paths formed along the direction in which the introduced mixed gas flows. The catalyst particles of the reforming catalyst 2 are assumed to be supported on a support, and the support is formed of, for example, aluminum oxide and supported on a base material. In addition, examples of the metal of the catalyst particles for reforming the incorporated hydrogen fuel can include noble metals such as platinum and ruthenium, or base metals such as nickel and cobalt, but are not limited thereto. Rather, it can be composed of any metal that can result in reforming of the incorporated hydrogen-based fuel.

  On the other hand, the oxidation catalyst 3 is disposed upstream of the reforming catalyst 2 and oxidizes in an oxygen atmosphere. Hydrogen-based fuel is produced using oxygen in the air taken in along with the hydrogen-based fuel from the inlet. A part of the catalyst, and the heat generated by the combustion is used to promote the temperature rise of the reforming catalyst 2 disposed on the downstream side to a reformable temperature, Catalyst particles are provided to oxidize a part of the hydrogen-based fuel taken in from, such as partial oxidation or complete oxidation. The oxidation catalyst 3 in this embodiment is formed in a honeycomb structure like the reforming catalyst 2 and has a plurality of flow paths formed along the direction in which the introduced mixed gas flows. The catalyst particles of the oxidation catalyst 3 are also carried on a carrier as in the reforming catalyst 2, and the carrier is formed of, for example, aluminum oxide and supported on a substrate. To do. Examples of the metal of the catalyst particles for oxidizing the incorporated hydrogen-based fuel include noble metals such as platinum and base metals such as iron, but are not limited thereto, and oxidation of the incorporated fuel is not limited thereto. It can be composed of any metal that can result.

  In the reformer 1 of the present embodiment, electric heating that heats the mixed gas introduced from the inlet portion inside the outer casing and upstream of the oxidation catalyst 3 to promote the temperature rise of the oxidation catalyst 3 is performed. A type heater 4 is provided. In this embodiment, an electric heating type catalyst (EHC) is disposed as such an electric heating type heater. This electrically heated catalyst comprises a carrier substrate on which a catalyst coat layer is formed, and a heating means for electrically heating the carrier substrate, and is in the air taken in along with the hydrogen-based fuel from the inlet. A part of the hydrogen-based fuel is burned using oxygen, and the mixed gas is heated using the heat generated by the combustion, so that the respective predetermined temperatures of the oxidation catalyst 3 and the reforming catalyst 2 arranged on the downstream side are heated. It plays a role in promoting the temperature rise to.

  In the present embodiment, the electric heating catalyst 4 is used auxiliary until the temperature of the oxidation catalyst 3 is raised to a predetermined temperature that is an oxidizable temperature. After the temperature is raised to a predetermined temperature, the energization is stopped and its use is stopped. In the present embodiment, the electrically heated catalyst 4 is arranged as a temperature increase promoting means until the oxidation catalyst 3 is heated to a predetermined temperature. However, the present invention is not limited to this, and it is not limited to this. Any electric heater may be used as long as it is an electric heater that has a function of heating the air-fuel mixture taken in by energization. Furthermore, in the present embodiment, for the purpose of quickly raising the temperature of the oxidation catalyst 3 to a predetermined temperature, a temperature rise promoting means such as an electric heating heater is disposed upstream of the oxidation catalyst 3. Such temperature increase promotion means may not be arranged, and the necessity of such temperature increase promotion means is generally determined according to the performance of the oxidation catalyst 3.

  In the reformer 1 in the present embodiment configured to include the reforming catalyst 2, the oxidation catalyst 3, and the electric heater 4 as described above, the temperature of the oxidation catalyst 3 is lower than the oxidizable temperature. In such a low temperature state, the electric heater 4 is energized and the temperature of the oxidation catalyst 3 is quickly raised to the oxidizable temperature. Then, using the heat of reaction due to the oxidation reaction in the oxidation catalyst 3 that has been heated to an oxidizable temperature, the reforming catalyst 2 that performs the reforming reaction is heated to promote the reforming reaction. The reforming control is executed.

  As described above, there is a demand for further shortening of the time required for the reforming catalyst to reach the reformable temperature with respect to the reformer in which such autothermal reforming control is performed. In response to this demand, the present invention further reduces the time required for the reforming catalyst to reach the reformable temperature by configuring and arranging a heat accumulator that can store heat by receiving heat in advance. It is an object of the present invention to provide a reforming system that is capable of reducing the power consumption and is excellent in terms of power consumption.

  By the way, in the autothermal reformer as described above, the reformed gas generated and released by the reformer is generally in a very high temperature state such as about 500 ° C. In consideration of the adverse effect on the apparatus to which the reformed gas is supplied, a heat exchanger is disposed between the reformer supplied apparatus and the reformer to cool the reformed gas. FIG. 12 shows one embodiment of such a prior art reforming system. The reference numerals shown in FIG. 12 are the same as in FIG. 1, 1 is a reformer, 2 is a reforming catalyst, 3 is an oxidation catalyst, 4 is an electrically heated heater, 5 is a heat exchanger, 14 is a reformer inlet valve, Reference numeral 16 denotes a reformer fuel injector. In such a configuration, if the heat transferred from the reformed gas in a high temperature state can be used for heat storage as described above, it is necessary to store heat in the heat accumulator with an additional electric heating source. Therefore, it is possible to shorten the time required for the reforming catalyst to reach the reformable temperature, and to provide a reforming system that is excellent in terms of power consumption.

  Based on this, in the reforming system of the present invention, a heat exchanger that cools the reformed gas by transferring heat from the reformed gas in a high temperature state generated by the reformer is provided downstream of the reformer. A heat accumulator that stores heat transferred from the reformed gas by the heat exchanger, and a catalyst temperature raising means that promotes the temperature rise of the oxidation catalyst using the heat accumulated in the heat accumulator. With this configuration, the heat necessary for raising the temperature of the oxidation catalyst can be stored, and if necessary, the temperature of the oxidation catalyst can be quickly raised to a predetermined temperature by the stored heat. This makes it possible to shorten the time required for the reforming catalyst to reach the reformable temperature.

  The reforming system of the embodiment shown in FIG. 1 includes a reformer 1, a heat exchanger 5, and a heat accumulator 21. The catalyst temperature raising means for promoting the temperature rise of the oxidation catalyst 3 using the heat stored in the heat accumulator 21 is a case where the temperature of the oxidation catalyst 3 is lower than a predetermined temperature, and the temperature of the oxidation catalyst 3 is set. When it is necessary to raise the temperature to a predetermined temperature, a circulation path capable of circulating the remaining gas remaining in the reformer 1 between the reformer 1 and the heat accumulator 21 is formed. The remaining gas is circulated, the remaining gas is heated by the heat stored in the heat accumulator 21, and the oxidation catalyst 3 is heated by the heated remaining gas.

  FIG. 2 is a flowchart showing an embodiment of the catalyst temperature rise control by the catalyst temperature raising means in the reforming system of the embodiment shown in FIG. In the catalyst temperature increase control in the reforming system of the embodiment shown in FIG. 2, the temperature of the oxidation catalyst 3 is lower than the predetermined temperature, and the temperature of the oxidation catalyst 3 needs to be increased to the predetermined temperature. This control is started before the reformer inlet valve 14 and the reformer outlet valve 15, the first circulation path valve 23, and the second circulation path valve 24. All valves shall be closed. It is assumed that heat transferred from the reformed gas by the heat exchanger 5 is accumulated in the heat accumulator 21.

  When the temperature of the oxidation catalyst 3 is lower than the predetermined temperature and the temperature of the oxidation catalyst 3 needs to be raised to the predetermined temperature and the catalyst temperature raising control is started, first, at step 101, the circuit The first valve 23 and the second circulation path valve 24 are opened to form a circulation path through which residual gas remaining in the reformer 1 can be circulated between the reformer 1 and the heat accumulator 21. The On the other hand, the reformer inlet valve 14 and the reformer outlet valve 15 are kept closed, and the flow of air from the outside to the reformer 1 is stopped. In such a valve state, the electric heater 4 is turned on and operated.

  In step 102 following step 101, the circulation pump 22 disposed in the circulation path of the residual gas remaining in the reformer 1 is turned on and operated, whereby the reformer 1 and the heat accumulator 21 are operated. In the meantime, the circulation of the remaining gas is started. At this time, the electric heater 4 is heated, and the heat accumulator 21 stores heat obtained by heat exchange from the reformed gas. Therefore, by such catalyst temperature raising control, the residual gas circulating between the reformer 1 and the heat accumulator 21 can be heated by the heat of the electric heater 4 and the heat accumulator 21, and the temperature is raised. It becomes possible to promote the temperature rise of the oxidation catalyst 3 by the residual gas.

  In step 103 following step 102, it is determined whether or not the temperature of the oxidation catalyst 3 has reached a predetermined temperature or higher. If it is determined that the temperature of the oxidation catalyst 3 is higher than or equal to the predetermined temperature, the subsequent step 104 is continued. move on. On the other hand, when it is determined that the temperature of the oxidation catalyst 3 has not reached the predetermined temperature, the control of Step 101 and Step 102 is continuously performed, that is, the reformer 1 and the regenerator of the heated residual gas. Thus, the temperature of the oxidation catalyst 3 is continuously increased by circulation with the engine 21.

  In step 104, since the temperature of the oxidation catalyst 3 is equal to or higher than the predetermined temperature, the circulation pump 22 is turned off and the operation is stopped, and between the heated residual gas reformer 1 and the regenerator 21. The temperature increase of the oxidation catalyst 3 due to the circulation of is stopped. At this time, the first circulation path valve 23 and the second circulation path valve 24 are closed, and the residual gas remaining in the reformer 1 is transferred between the reformer 1 and the heat accumulator 21. The circulation path that can be circulated is closed. On the other hand, the reformer inlet valve 14 and the reformer outlet valve 15 are opened so that air can be circulated from the outside to the reformer 1.

  In Step 105 following Step 104, the electric heater 4 is turned off and the operation is stopped. In Step 106 following Step 105, fuel is supplied by the reformer fuel injector 16, and Air is supplied to the reformer 1 and reforming is started. During the operation of the reformer 1, the reformed gas is cooled by the heat exchanger 5, and the heat taken by the heat exchanger 5 is stored in the heat accumulator 21 and used for the next start-up. Then, when the operation of the reformer 1 becomes unnecessary, this control is terminated, and at that time, the reformer inlet valve 14 and the reformer outlet valve 15, the first circulation path valve 23, and the second circulation path valve 24. Are closed, and the flow of air from the outside to the reformer 1 is stopped.

  According to the catalyst temperature raising control of the reforming system shown in FIG. 2 as described above, it is necessary to raise the temperature of the oxidation catalyst 3 to the predetermined temperature even when the temperature of the oxidation catalyst 3 is lower than the predetermined temperature. In some cases, a circulation path capable of circulating the remaining gas remaining in the reformer 1 between the reformer 1 and the heat accumulator 21 is formed, and the remaining gas is circulated in the circulation path to thereby store the heat accumulator. The residual gas is heated by the heat stored in 21 and the temperature of the oxidation catalyst 3 can be raised by the heated residual gas. Incidentally, it is possible to promote the temperature increase of the oxidation catalyst 3 only by heating the residual gas by the heat stored in the heat accumulator 21, and in the embodiment shown in FIG. 1, the electric heater 4 is a reformer. However, the present invention is not limited to this, and the electric heater 4 may be excluded from the configuration of the reformer 1.

  FIG. 3 is a diagram showing another embodiment of the overall configuration of the reforming system of the present invention. The reforming system shown in FIG. 3 is connected to the reformer in the same manner as the embodiment shown in FIG. The reformed gas generated in this way is configured to be supplied to the internal combustion engine. In FIG. 3, 31 indicates a heat accumulator, 32 indicates a circulation pump, and 33 indicates an inlet portion of the reformer. In FIG. 3, the reformer 1, reforming catalyst 2, oxidation catalyst 3, electric heater 4, heat exchanger 5, air flow meter 11, throttle valve 12, internal combustion engine 13, reformer inlet valve 14, Each of the mass device outlet valve 15, the reformer fuel injector 16, and the engine fuel injector 17 has the same configuration as that of the embodiment shown in FIG.

  The reforming system according to the embodiment shown in FIG. 3 includes a reformer 1, a heat exchanger 5, and a heat accumulator 31. The catalyst temperature raising means for promoting the temperature rise of the oxidation catalyst 3 using the heat stored in the heat accumulator 31 is a case where the temperature of the oxidation catalyst 3 is lower than a predetermined temperature and the temperature of the oxidation catalyst is set to a predetermined value. When it is necessary to raise the temperature, the heat medium is heated by the heat stored in the heat accumulator 31, and the heated heat medium is transferred between the inlet 33 of the reformer 1 and the heat accumulator 31. The gas mixture is circulated and the mixed gas taken in from the inlet 33 of the reformer 1 is heated by the heated heat medium, and the temperature of the oxidation catalyst 3 is increased by the heated mixed gas.

  FIG. 4 is a flowchart showing an embodiment of control in the reforming system of the embodiment shown in FIG. In the catalyst temperature increase control in the reforming system of the embodiment shown in FIG. 4, as in the control shown in FIG. 2, the temperature of the oxidation catalyst 3 is less than a predetermined temperature and the temperature of the oxidation catalyst 3 is set. This control is started when it is necessary to raise the temperature to a predetermined temperature. Further, it is assumed that the reformer inlet valve 14 and the reformer outlet valve 15 are closed before the start. Furthermore, it is assumed that heat transferred from the reformed gas by the heat exchanger 5 is accumulated in the heat accumulator 31.

  When the temperature of the oxidation catalyst 3 is lower than the predetermined temperature and the temperature of the oxidation catalyst 3 needs to be raised to the predetermined temperature and the catalyst temperature raising control is started, first, in step 201, the reformer The inlet valve 14 and the reformer outlet valve 15 are opened, and air can be circulated from the outside to the reformer 1. And in such a valve state, the circulation pump 32 arranged in the circulation passage that brings about the circulation of the heat medium between the inlet 33 of the reformer 1 and the heat accumulator 31 is turned on and operated. Circulation of the heat medium between the inlet 33 of the vessel 1 and the regenerator 31 is effected.

  In step 202 following step 201, the electric heater 4 is turned on and operated, and the electric heater 4 is heated. In step 203 subsequent to step 202, fuel is supplied from the reformer fuel injector 16 and air is supplied to the reformer 1. At this time, heat obtained by heat exchange from the reformed gas is stored in the heat accumulator 31, and a heat medium circulating between the inlet 33 of the reformer 1 and the heat accumulator 31 is heated. Can do. Therefore, by such catalyst temperature increase control, the heated gas that circulates the mixed gas taken from the inlet 33 of the reformer 1 between the inlet 33 of the reformer 1 and the heat accumulator 31 and It can be heated by the electric heater 4 and the temperature rise of the oxidation catalyst 3 can be promoted by the air-fuel mixture thus heated.

  In step 204 following step 203, it can be determined whether or not the temperature of the oxidation catalyst 3 has reached a predetermined temperature or higher, and if it is determined that the temperature of the oxidation catalyst 3 is higher than or equal to the predetermined temperature, the subsequent step 205 is continued. move on. On the other hand, when it is determined that the temperature of the oxidation catalyst 3 has not reached the predetermined temperature, the control from step 201 to step 203 is continuously executed, that is, the inlet 33 of the reformer 1 and the heat accumulator 31. The temperature of the oxidation catalyst 3 is continuously increased by the mixed gas heated by the heated heating medium circulating between and the electric heater 4.

  In step 205, since the temperature of the oxidation catalyst 3 is equal to or higher than the predetermined temperature, the electric heater 4 is turned off and the operation is stopped. In step 206 following step 205, the circulation pump 32 is turned off. Then, the operation is stopped, the circulation of the heat medium is stopped between the inlet 33 of the reformer 1 and the heat accumulator 31, and the reformer 1 enters a normal operation state. During the operation of the reformer 1, the reformed gas is cooled by the heat exchanger 5, and the heat taken by the heat exchanger 5 is stored in the heat accumulator 31 and used for the next start-up. Then, when the operation of the reformer 1 becomes unnecessary, this control is terminated, and at that time, the reformer inlet valve 14 and the reformer outlet valve 15 are closed, and the flow of air from the outside to the reformer 1 is allowed. Canceled.

  According to the catalyst temperature raising control of the reforming system shown in FIG. 4 as described above, it is necessary to raise the temperature of the oxidation catalyst 3 to the predetermined temperature even when the temperature of the oxidation catalyst 3 is lower than the predetermined temperature. In some cases, the heat medium is heated by the heat stored in the heat accumulator 31, and the heated heat medium is circulated between the inlet 33 of the reformer 1 and the heat accumulator 31 to be heated. The mixed gas taken from the inlet of the reformer 1 is heated by the heated medium, and the temperature of the oxidation catalyst 3 can be raised by the heated mixed gas. Incidentally, the heating of the oxidation catalyst 3 can be promoted only by heating the heat medium by the heat stored in the heat accumulator 31, and in the embodiment shown in FIG. 3, the electric heater 4 is a reformer. However, the present invention is not limited to this, and the electric heater 4 may be excluded from the configuration of the reformer 1.

  FIG. 5 is a diagram showing another embodiment of the overall configuration of the reforming system of the present invention. The reforming system shown in FIG. 5 is connected to the reformer in the same manner as the embodiment shown in FIG. The reformed gas generated in this way is configured to be supplied to the internal combustion engine. In FIG. 5, reference numeral 41 denotes a heat accumulator, 42 denotes a bypass fuel valve, and 43 denotes a reformer bypass fuel injector. In FIG. 5, the reformer 1, the reforming catalyst 2, the oxidation catalyst 3, the electric heating heater 4, the heat exchanger 5, the air flow meter 11, the throttle valve 12, the internal combustion engine 13, the reformer inlet valve 14, Each of the mass device outlet valve 15, the reformer fuel injector 16, and the engine fuel injector 17 has the same configuration as that of the embodiment shown in FIG.

  The reforming system of the embodiment shown in FIG. 5 includes a reformer 1, a heat exchanger 5, and a heat accumulator 41. The catalyst temperature raising means for promoting the temperature rise of the oxidation catalyst 3 using the heat stored in the heat accumulator 41 is a case where the temperature of the oxidation catalyst 3 is lower than a predetermined temperature, and the temperature of the oxidation catalyst is set. When it is necessary to raise the temperature to a predetermined temperature, a fuel detour that can supply hydrogen-based fuel to the reformer 1 via the heat accumulator 41 is formed, and hydrogen-based fuel is supplied to the fuel detour to store heat. The hydrogen fuel is heated by the heat stored in the vessel 41, and the temperature of the oxidation catalyst 3 is raised by the heated hydrogen fuel.

  FIG. 6 is a flowchart showing an embodiment of the catalyst temperature increase control in the reforming system of the embodiment shown in FIG. In the catalyst temperature increase control in the reforming system of the embodiment shown in FIG. 6, as in the control shown in FIG. 2, the temperature of the oxidation catalyst 3 is less than a predetermined temperature and the temperature of the oxidation catalyst 3 is set. This control is started when it is necessary to raise the temperature to a predetermined temperature. Further, it is assumed that the reformer inlet valve 14 and the reformer outlet valve 15 and the bypass fuel valve 42 are closed before the start. Furthermore, it is assumed that heat transferred from the reformed gas by the heat exchanger 5 is accumulated in the heat accumulator 41.

  When the temperature of the oxidation catalyst 3 is lower than the predetermined temperature and the temperature of the oxidation catalyst 3 needs to be raised to the predetermined temperature and the catalyst temperature raising control is started, first, in step 301, the reformer The inlet valve 14, the reformer outlet valve 15, and the bypass fuel valve 42 are opened, and the flow of air from the outside to the reformer 1 and the fuel injection from the bypass fuel injector 43 for the reformer are enabled. Then, the electric heater 4 is turned on and operated, and the electric heater 4 is heated.

  In step 302 subsequent to step 301, fuel is supplied by the detour fuel injector 43 and air is supplied to the reformer 1. At this time, the electric heater 4 is heated, and the heat accumulator 41 stores heat obtained by heat exchange from the reformed gas, and the heat accumulated in the heat accumulator 41 is used as fuel. The fuel flowing through the detour can be heated. Therefore, by such catalyst temperature rise control, the mixed gas taken in from the inlet portion of the reformer 1 can be made into a heated mixture by the heated fuel and the electric heater 4. It becomes possible to promote the temperature rise of the oxidation catalyst 3 by the air-fuel mixture heated to the first.

  In step 303 subsequent to step 302, it can be determined whether or not the temperature of the oxidation catalyst 3 has reached a predetermined temperature or higher. If it is determined that the temperature of the oxidation catalyst 3 is higher than or equal to the predetermined temperature, the subsequent step 304 is continued. move on. On the other hand, if it is determined that the temperature of the oxidation catalyst 3 has not reached the predetermined temperature, the control from step 301 to step 302 is continuously executed, that is, by the heated fuel and the electric heater 4. The temperature of the oxidation catalyst 3 is continuously raised by the heated heated mixed gas.

  In step 304, since the temperature of the oxidation catalyst 3 is equal to or higher than the predetermined temperature, the electric heater 4 is turned off and the operation is stopped. In step 305 following step 304, the bypass fuel valve 42 is closed, the fuel supply from the reformer bypass fuel injector 43 to the reformer 1 is stopped, and the fuel from the reformer fuel injector 16 is stopped. Switching to the fuel supply to the reformer 1 starts normal operation of the reformer 1. During the operation of the reformer 1, the reformed gas is cooled by the heat exchanger 5, and the heat taken by the heat exchanger 5 is stored in the heat accumulator 41 and used for the next start-up. Then, when the operation of the reformer 1 becomes unnecessary, this control is terminated, and at that time, the reformer inlet valve 14 and the reformer outlet valve 15 are closed, and the flow of air from the outside to the reformer 1 is allowed. Canceled.

  According to the catalyst temperature increase control of the reforming system shown in FIG. 6 as described above, it is necessary to raise the temperature of the oxidation catalyst 3 to the predetermined temperature even when the temperature of the oxidation catalyst 3 is lower than the predetermined temperature. In some cases, the fuel injected into the reformer 1 is heated by the heat stored in the heat accumulator 41, and is taken from the inlet of the reformer 1 by the heated fuel and the electric heater 4. It is possible to raise the temperature of the oxidation catalyst 3 by using the mixed gas as a heated air-fuel mixture. Incidentally, the temperature increase of the oxidation catalyst 3 can be promoted only by heating the fuel by the heat stored in the heat accumulator 41. In the embodiment shown in FIG. However, the present invention is not limited to this, and the electric heater 4 may be excluded from the configuration of the reformer 1.

  FIG. 7 is a diagram showing another embodiment of the overall configuration of the reforming system of the present invention. In FIG. 7, 51 indicates a heat accumulator, 52 indicates a first circulation pump, 53 indicates an electric heating heater, 54 indicates a second circulation pump, and 55 indicates a third circulation pump. Note that each of the reformer 1, reforming catalyst 2, oxidation catalyst 3, heat exchanger 5, reformer inlet valve 14 and reformer fuel injector 16 in FIG. 7 is the same as that of the embodiment shown in FIG. The configuration is the same as the above.

  The reforming system of the embodiment shown in FIG. 7 includes a reformer 1, a heat exchanger 5, and a heat accumulator 51. The catalyst temperature raising means for promoting the temperature rise of the oxidation catalyst 3 using the heat stored in the heat accumulator 51 is a case where the temperature of the oxidation catalyst 3 is lower than a predetermined temperature, and the temperature of the oxidation catalyst 3 is set. When it is necessary to raise the temperature to a predetermined temperature, the heat medium is heated by the heat stored in the heat accumulator 51, and the heated heat medium is circulated between the oxidation catalyst 3 and the heat accumulator 51. The temperature of the oxidation catalyst 3 is raised by the heated heat medium.

  In the reforming system shown in FIG. 7, it is necessary to raise the temperature of the oxidation catalyst 3 to a predetermined temperature when the temperature of the oxidation catalyst 3 is lower than the predetermined temperature, as in the catalyst temperature increase control shown in FIG. It is assumed that the catalyst temperature increase control by the catalyst temperature increase means of the present reforming system is started when there is any. Further, it is assumed that the reformer inlet valve 14 is closed before the catalyst temperature raising control is started. Further, the regenerator 51 uses a second circulation pump 54 disposed in a circulation path that brings about circulation of the heat medium between the heat exchanger 5 and the heat accumulator 51, and the heat exchanger 5 uses the reformed gas. It is assumed that the heat transferred from is accumulated.

  In addition, in embodiment shown by FIG.1, FIG3 and FIG.5, although the circulation pump arrange | positioned in the circulation path which brings about the circulation of the heat medium between the heat exchanger 5 and the heat storage device is not shown in particular. A circulation pump similar to the second circulation pump 54 as shown in the present embodiment is arranged and configured. Further, in the present embodiment, when there is a need for further cooling of the generated reformed gas, that is, even if the heat of the reformed gas is transferred to the heat accumulator, the excess heat still exists and the reformed gas is improved. In consideration of the case where the necessity of further movement of the heat of the quality gas arises, the heat exchanger 5 is provided with a surplus heat waste circuit and a circulation of the heat medium in the surplus heat waste circuit. A three-circulation pump 55 is arranged. Such an excess heat waste circulation path and the third circulation pump 55 may be applied to the embodiment shown in FIGS. 1, 3, and 5.

  When the temperature of the oxidation catalyst 3 is lower than the predetermined temperature and the temperature of the oxidation catalyst 3 needs to be raised to the predetermined temperature and the catalyst temperature increase control is started, the reformer inlet valve 14 is first opened. Thus, air can be circulated from the outside to the reformer 1. In such a valve state, the first circulation pump 52 disposed in the circulation path that brings about the circulation of the heat medium between the oxidation catalyst 3 and the heat accumulator 51 is turned on and operated, and the oxidation catalyst 3 and the heat storage Circulation of the heat medium to and from the vessel 51 is provided.

  Next, an electric heating heater 53 that is disposed in a circulation path that brings about circulation of the heat medium between the heat accumulator 51 and the oxidation catalyst 3 and can heat the heat medium in an auxiliary manner is turned on and operated. The heater 53 is heated. Then, fuel is supplied by the reformer fuel injector 16 and air is supplied to the reformer 1. At this time, the electric heater 53 is heated, and heat obtained by heat exchange from the reformed gas is stored in the heat accumulator 51, and between the oxidation catalyst 3 and the heat accumulator 51. The circulating heat medium can be heated. Therefore, the temperature increase of the oxidation catalyst 3 can be promoted by such catalyst temperature increase control. The electric heater 53 that performs auxiliary heating of the heat medium is used only when, for example, the temperature of the heat medium heated by the heat accumulator is lower than the temperature at which the oxidation catalyst is activated. It may be said.

  According to the reforming system shown in FIG. 7 as described above, when the temperature of the oxidation catalyst 3 is lower than the predetermined temperature and the temperature of the oxidation catalyst 3 needs to be raised to the predetermined temperature, the regenerator It is possible to heat the heat medium with the heat stored in 51 and to circulate the heated heat medium between the oxidation catalyst 3 and the heat accumulator 51 to promote the temperature rise of the oxidation catalyst 3. To do. Incidentally, the temperature increase of the oxidation catalyst 3 can be promoted only by heating the heat medium by the heat stored in the heat accumulator 51. In the embodiment shown in FIG. Although included as one component of the means, the invention is not limited to this, and the electric heater 53 may be omitted from the configuration.

  FIG. 8 is a diagram showing another embodiment of the overall configuration of the reforming system of the present invention. The reforming system of the embodiment shown in FIG. 8 has an exhaust gas heat storage means for storing heat of the exhaust gas of the internal combustion engine in a heat accumulator in addition to the same configuration as that of the embodiment shown in FIG. Configured. That is, in the present embodiment, it is configured to have an exhaust gas heat storage means for storing the heat of the exhaust gas of the internal combustion engine in the heat accumulator, and the heat of the exhaust gas of the internal combustion engine together with the heat of the reformed gas to the heat accumulator. The heat is stored, and the temperature of the oxidation catalyst is promoted using the stored heat.

  The exhaust gas heat storage means in the present embodiment is configured by arranging a heat exchanger 25 for exchanging heat with the exhaust gas from the internal combustion engine 13 in the exhaust system of the internal combustion engine 13. The exhaust gas heat storage means uses a circulation pump arranged in a circulation path that brings about circulation of the heat medium between the heat exchanger 25 and the heat storage device 21 arranged in the exhaust system of the internal combustion engine 13, The heat of the exhaust gas is moved by the heat exchanger 25, and the moved heat is supplied to the heat accumulator 21 to store the heat.

  According to the configuration of the reforming system shown in FIG. 8, the heat of the exhaust gas from the internal combustion engine as well as the heat of the generated reformed gas can be used as a heat storage heat source for the heat accumulator 21. Thus, it is possible to store heat to the heat accumulator 21 more reliably. The exhaust gas heat storage means shown in the present embodiment may be applied not only to the embodiment shown in FIG. 1 but also to the embodiment shown in FIG. 3, FIG. 5, and FIG.

  FIG. 9 is a diagram showing an embodiment of a heat accumulator in the reforming system of the present invention, and in particular, a heat accumulator used in the reforming system of the embodiment shown in FIG. 1, FIG. 5 and FIG. It is a figure which shows one Embodiment. The heat accumulator in the present embodiment includes an exterior casing 61, an interior casing 62, and a heat insulating layer 63. A part of the circulation path that causes circulation of the heat medium 64 between the heat exchanger 5 that performs heat exchange with the generated reformed gas and the heat accumulator is disposed in the interior housing 62, and the mixing is performed. An entrance for gas or fuel 65 is provided. A heat insulating layer 63 is formed between the exterior casing 61 and the interior casing 62 in order to store the heat supplied by the heat medium. In the present embodiment, the heat insulating layer 63 is formed as a vacuum space. However, the present invention is not limited to this, and the form of the heat insulating layer 63 may be appropriately determined according to design specifications and the like, and may be configured to be filled with a heat insulating material, for example. In the present embodiment, for example, water, molten salt, silicon oil, or the like is applied as a heat medium that circulates between the heat exchanger 5 that performs heat exchange with the generated reformed gas and the heat accumulator. Shall be.

FIG. 10 is a diagram showing another embodiment of the heat accumulator in the reforming system of the present invention, and in particular, one heat accumulator used in the reforming system of the embodiment shown in FIG. 3 and FIG. It is a figure which shows embodiment. The heat accumulator in the present embodiment is configured to perform heat storage by so-called chemical heat storage, and ammonia (NH ₃ ) that is in fluid communication with the outer casing 71 and the outer casing 71 and the valve 73. The storage chamber 72 is configured.

  In the exterior casing 71, a part of a circulation path that causes circulation of the heat medium 75 between the heat exchanger 5 and the heat accumulator that performs heat exchange with the generated reformed gas, the heat accumulator, and the reformer A part of the circulation path that provides circulation of the heat medium 74 between the inlet of the vessel or the oxidation catalyst is arranged. The exterior casing 71 is filled with a metal salt. In the present embodiment, circulation is performed between the heat exchanger 5 that performs heat exchange with the generated reformed gas and the heat accumulator, and between the heat accumulator and the inlet of the reformer or the oxidation catalyst. As the heat medium to be used, for example, water, molten salt, silicon oil, or the like is applied.

In this embodiment, when the temperature of the oxidation catalyst is lower than the predetermined temperature and the temperature of the oxidation catalyst needs to be raised to the predetermined temperature, ammonia in the storage chamber 72 is allowed to enter the outer casing 71. Thus, the heat of reaction generated when ammonia is absorbed by the metal salt is heated, and the heat medium 74 circulating between the heat accumulator and the inlet of the reformer or the oxidation catalyst is heated. The heating medium 74 is used to raise the temperature of the oxidation catalyst. On the other hand, in the case of performing heat storage on the heat accumulator, the metal salt is generated by the heat supplied by the heat medium 75 that circulates between the heat exchanger 5 that performs heat exchange with the generated reformed gas and the heat accumulator. The ammonia absorbed in the catalyst is desorbed, and the desorbed ammonia is stored in the storage chamber 72 so that it can be used when the temperature of the next oxidation catalyst is raised. The valve 73 interposed between the outer casing 71 and the ammonia (NH ₃ ) storage chamber 72 is opened when the temperature of the oxidation catalyst is increased and when the heat storage of the regenerator is performed. It is closed when it is not in use.

  FIG. 11 is a diagram showing another embodiment of the heat accumulator in the reforming system of the present invention, and in particular, one of the heat accumulators used in the reforming system of the embodiment shown in FIG. 3 and FIG. It is a figure which shows embodiment. The heat accumulator in the present embodiment includes an exterior casing 82, an interior casing 83, and a heat insulating layer 84. In the interior casing 83, a part of the circulation path that causes the heat medium 90 to circulate between the heat exchanger 5 that performs heat exchange with the generated reformed gas and the heat accumulator, the heat accumulator, and the reformer A part of the circulation path that provides circulation of the heat medium 89 between the inlet of the vessel or the oxidation catalyst is arranged. And the valves 85-87 are arrange | positioned at each entrance / exit of each circulation path. Between the outer casing 82 and the inner casing 83 in order to store heat supplied by the heat medium 90 circulating between the heat exchanger 5 that performs heat exchange with the generated reformed gas and the heat accumulator. A heat insulating layer 84 is formed. In this embodiment, the heat insulation layer 84 shall be formed as a vacuum space. However, the present invention is not limited to this, and the form of the heat insulating layer 84 may be appropriately determined according to design specifications and the like, and may be configured to be filled with a heat insulating material, for example. Further, in the present embodiment, the heat medium 90 that circulates between the heat exchanger 5 that performs heat exchange with the generated reformed gas and the heat accumulator, and the inlet portion or oxidation of the heat accumulator and the reformer For example, water, molten salt, silicon oil, or the like is applied as the heat medium 89 circulating between the catalyst and the catalyst.

  In this embodiment, when the temperature of the oxidation catalyst is lower than the predetermined temperature and the temperature of the oxidation catalyst needs to be raised to the predetermined temperature, heat exchange is performed for heat exchange with the generated reformed gas. Valves 87 and 88 arranged at the inlet / outlet with respect to the heat accumulator in the circulation path that brings about the circulation of the heat medium between the regenerator 5 and the heat accumulator are closed, and between the heat accumulator and the reformer inlet or the oxidation catalyst. The valves 85 and 86 disposed at the entrance and exit of the heat accumulator in the circulation path that brings about the circulation of the heat medium are opened, and the temperature of the oxidation catalyst is raised using the heat medium 89 heated by the heat accumulation of the heat accumulator. Configured. On the other hand, in the case of performing heat storage on the heat accumulator, at the entrance to the heat accumulator in the circulation path that brings about circulation of the heat medium between the heat exchanger 5 that performs heat exchange with the generated reformed gas and the heat accumulator. The disposed valves 87 and 88 are opened, and the valves 85 and 86 are disposed at the inlet / outlet with respect to the heat accumulator in the circulation path that provides circulation of the heat medium between the heat accumulator and the reformer inlet or the oxidation catalyst. Is closed and heat storage for the heat accumulator is performed.

  As can be understood from the above description, according to the reforming system of the present invention as described above, in the autothermal reforming apparatus, the heat transferred from the high-temperature reformed gas is received by the heat exchanger. It is possible to further shorten the time required for the reforming catalyst to reach the reformable temperature by arranging the heat accumulator that can store the heat and to be excellent in terms of power consumption. It is possible to provide an improved reforming system. Although the reforming system of the present invention of the embodiment shown above is shown as being applied to a configuration for supplying hydrogen to the intake system of an internal combustion engine, the reforming system of the present invention is not limited to this. For example, the present invention may be applied to a configuration for supplying hydrogen to a fuel cell.

DESCRIPTION OF SYMBOLS 1 Reformer 2 Reforming catalyst 3 Oxidation catalyst 5 Heat exchanger 21 Regenerator 22 Circulation pump

Claims (6)

A reformer that generates hydrogen by introducing a hydrogen-based fuel containing at least hydrogen as a constituent component together with air as a mixed gas from an inlet portion, and reforming the hydrogen-based fuel to generate hydrogen; In a reforming system comprising a reformer having an oxidation catalyst that is disposed upstream of the reforming catalyst and oxidizes in an oxygen atmosphere,
A heat exchanger disposed downstream of the reformer, the heat exchanger performing heat exchange with the reformed gas generated by reforming the mixed gas;
A heat accumulator for accumulating heat transferred from the reformed gas by the heat exchanger;
A reforming system, comprising: a catalyst temperature raising means for promoting the temperature rise of the oxidation catalyst using heat stored in the heat accumulator.   When the temperature of the oxidation catalyst is lower than a predetermined temperature and the temperature of the oxidation catalyst needs to be increased to a predetermined temperature, the catalyst temperature raising means is the remaining in the reformer A circulation path capable of circulating gas between the reformer and the heat accumulator is formed, the residual gas is circulated in the circulation path, and the residual gas is heated by heat stored in the heat accumulator. The reforming system according to claim 1, wherein the temperature of the oxidation catalyst is raised by the heated residual gas.   When the temperature of the oxidation catalyst is lower than a predetermined temperature and the temperature of the oxidation catalyst needs to be increased to a predetermined temperature, the catalyst temperature raising means is heated by heat stored in the heat accumulator. The medium is heated, and the heated heat medium is circulated between the inlet portion of the reformer and the heat accumulator, and is taken in from the inlet portion of the reformer by the heated heat medium. The reforming system according to claim 1, wherein a mixed gas is heated, and the temperature of the oxidation catalyst is raised by the heated mixed gas.   When the temperature of the oxidation catalyst is lower than a predetermined temperature and the temperature of the oxidation catalyst needs to be increased to a predetermined temperature, the catalyst temperature raising means is configured to pass the hydrogen fuel through the heat accumulator. A fuel bypass route to be supplied to the reformer is formed, the hydrogen fuel is supplied to the fuel bypass route, the hydrogen fuel is heated by heat stored in the heat accumulator, and the The reforming system according to claim 1, wherein the temperature of the oxidation catalyst is increased by a hydrogen-based fuel.   When the temperature of the oxidation catalyst is lower than a predetermined temperature and the temperature of the oxidation catalyst needs to be increased to a predetermined temperature, the catalyst temperature raising means is heated by heat stored in the heat accumulator. The modified medium according to claim 1, wherein the medium is heated, the heated heat medium is circulated between the oxidation catalyst and the heat accumulator, and the temperature of the oxidation catalyst is increased by the heated heat medium. Quality system.   The reforming system according to claim 5, wherein the catalyst temperature raising unit includes an electric heating heater that is disposed in a circulation path through which the heat medium circulates and can supplementarily heat the heat medium.

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