JP6139180B2 - Operation method of volatile organic compound processing equipment - Google Patents

Description

  The present invention relates to an operation method for improving the efficiency of processing work in processing a volatile organic compound from a gas before discharging the gas containing the volatile organic compound.

  Exhaust gas generated from factories may contain volatile organic compounds that cause problems if discharged into the atmosphere as they are. In this case, before exhaust gas is discharged into the atmosphere, the contained volatile organic compounds must be treated. As a method for this, an adsorption tower containing activated carbon or other adsorbent is used to adsorb volatile organic compounds contained in exhaust gas to the adsorbent, reduce the concentration in the gas and discharge it to the atmosphere. An adsorption / desorption system is generally used in which a volatile organic compound is desorbed to make the adsorption tower reusable and the volatile organic compound is treated.

  For the above desorption, it is necessary to bring a gas not containing a volatile organic compound into contact with the adsorbent. Since adsorption cannot be performed simultaneously with desorption by a single adsorption tower, desorption is preferably carried out promptly. As a method of speeding up desorption, a method of introducing a large amount of desorption gas, a method of reducing pressure by sucking with a vacuum pump, a method of introducing high-temperature desorption water vapor to promote desorption which is an endothermic reaction, etc. There is.

  In order to introduce high-temperature desorption water vapor, a large amount of fuel is consumed for its heating, so a method for saving fuel has been studied. In Patent Document 1, desorbed water vapor containing the recovered volatile organic compound is guided to a combustion furnace, and the volatile organic compound is burned as a fuel (Claim 1). It is described that the steam is heated (Claim 2).

  However, exhaust gas containing a volatile organic compound is introduced from below the adsorption tower and the treated gas is discharged from above, whereas desorption water vapor is introduced from above the adsorbent layer, If the entire part of the layer is desorbed and extracted from the lower side of the adsorbent layer, it takes too much time for the desorbed water vapor to pass through the adsorbent layer. That is, it takes too much time from the start of heating to generate desorption steam in the combustion furnace until the organic compound is extracted along with the steam and reaches the combustion furnace (steam generator). Until then, the recovered volatile organic compound could not be used as fuel, and another fuel such as LNG gas had to be used, resulting in waste.

  On the other hand, the supply port to the adsorption tower for desorption water vapor is composed of a plurality of stages divided in both end directions, and the position where the adsorption layer occupies the supply port on the one end side of the adsorption tower most of the adsorption tower. The desorption water vapor is introduced from the middle of the adsorption layer opened from the supply port located on one end side of the adsorption tower, and the organic compound-containing water vapor, which is desorbed and takes in the volatile organic compound, is disposed in the adsorption tower. A method of extracting from one end side is described in Patent Document 2. According to this method, the first supply port for supplying water vapor is close to the discharge port, so that the organic solvent desorbed in a part of the upper layer of the adsorption layer quickly reaches the discharge port and reaches the combustion furnace. The required time is reduced. Accordingly, it is possible to reduce the consumption of fuel that had to be supplied separately until the organic solvent reaches the combustion furnace.

JP 2007-2222736 A JP2011-226690A

  However, since the adsorbent in the adsorption layer is cold immediately after the start of desorption, the desorbed water vapor introduced at the beginning of desorption condenses into a liquid in the adsorption tower and transports the desorbed organic solvent to the combustion furnace. Did not generate enough pressure. For this reason, in order to reach the combustion furnace even though the organic solvent has been desorbed, the steam can be pushed out to the combustion furnace without substantially losing the introduced pressure without agglomeration. Had to wait until the adsorbed layer warmed up.

  Therefore, the present invention relates to a time lag from the start of desorption until it can be used as fuel when desorbing volatile organic compounds from an adsorption tower using heated desorption water vapor and burning the desorbed volatile organic compounds in a combustion furnace. The purpose of this is to further shorten the fuel consumption and suppress the waste of fuel.

  The present invention solves the above-mentioned problems by introducing, as a desorption gas used for desorption, a mixed gas obtained by mixing an extrusion gas containing a gas component at normal temperature and normal pressure with water vapor into an adsorption tower. When such a mixed gas is used, the pressure of the gas supplied to the adsorption tower is reduced because the extruded gas remains as a gas even if the water vapor aggregates into water by being cooled in contact with the adsorption layer. While partially reduced, it is possible to secure the pressure to push out. Then, the volatile organic compound heated and desorbed by the mixed gas can be pushed out from the outlet of the adsorption tower as soon as it passes through the adsorption layer, and accompanied to the combustion furnace. As a result, the time from the start of desorption to the arrival of the volatile organic compound in the combustion furnace is shortened by the amount of time that was conventionally waited for the adsorption layer to be heated to a temperature at which water vapor is not agglomerated. Thus, the fuel can be used more quickly and the amount of fuel consumed can be reduced.

  As the extrusion gas, a pipe may be provided so that the exhaust gas after the high temperature gas generated in the combustion furnace is introduced into the heat exchanger and water vapor is generated can be used, or the pipe is provided so that the high temperature gas itself can be used. Alternatively, piping may be provided so that both can be used. The main components of the high-temperature gas and exhaust gas are water and carbon dioxide generated by the combustion of hydrocarbons, and carbon dioxide out of them is not condensed at room temperature and normal pressure and remains a gas. Therefore, when mixed gas is introduced into the adsorption tower, water vapor becomes water while carbon dioxide remains as a gas, so the internal pressure in the adsorption tower increases, and volatile organic compounds are pushed out or entrained toward the combustion furnace. Can be carried.

  The mixed gas can be mixed by connecting a pipe for introducing exhaust gas or a high-temperature gas and a pipe for introducing water vapor generated from the heat exchanger, but the mixed gas can be sufficiently desorbed. It is good to provide piping so that it can circulate through the path | route containing a heat exchanger so that it can heat. This is because even if exhaust gas or high-temperature gas is contained, if the water vapor is not sufficiently warmed, desorption does not proceed sufficiently even if it is introduced into the adsorption tower, and only water may increase. Here, it is desirable that the temperature in the path circulating before introduction is 150 degrees or more.

  In introducing this mixed gas into the adsorption tower, at least not only the bottom of the adsorption tower, but also the side where the adsorption layer is present is provided with a supply port, which can be introduced from two or more supply ports, The mixed gas may be introduced from a supply port close to the side where the desorbed volatile organic compound is supplied, that is, close to the supply port. Even if the mixed gas is used, if it is introduced from the other end side that must pass through the entire adsorption layer, it takes too much time for the volatile organic compound to reach the outlet. For this reason, it is desirable that the volatile organic compound that has passed through only a small part of the one end side of the adsorption layer and quickly reaches the outlet is sent to the combustion furnace.

  By implementing this invention in an adsorption tower for treating a gas containing a volatile organic compound, consumption of fuel used for removing the volatile organic compound can be suppressed and energy saving can be achieved.

Conceptual diagram of an adsorption tower and its peripheral devices for carrying out the present invention Flow chart of desorption process for carrying out this invention Flow chart of adsorption process and desorption process for implementing this invention Conceptual diagram of an adsorption tower and its peripheral devices in a comparative example Graph of combustion furnace temperature in the example Graph of combustion furnace temperature in comparative example

  Embodiments of the present invention will be described below. The present invention relates to a volatile organic compound processing apparatus that reduces the concentration of a volatile organic compound-containing gas so that the gas can be discharged into the atmosphere, collects the volatile organic compound, and uses it as a fuel. FIG. 1 shows an example of an overall image of a volatile organic compound processing apparatus according to the present invention.

  The volatile organic compound to be treated in the present invention is an organic compound that can be converted into a gas when heated at normal pressure, and particularly, a liquid that is liquid at room temperature is easily adsorbed. Examples thereof include hydrocarbon solvents such as alcohols having about 1 to 8 carbon atoms such as methanol, ethanol and isopropyl alcohol, and aromatic organic compounds such as toluene and benzene.

  The volatile organic compound processing apparatus for carrying out the present invention includes an adsorption tower 11, a combustion furnace 13, a heat exchanger 14, and a pipe connecting them.

  The adsorption tower 11 has a substantially cylindrical shape, and the inside is partitioned by a single porous plate 20 provided in the vicinity of the lower end. An adsorption layer 12 filled with an adsorbent that adsorbs volatile organic compounds and can be desorbed by heating is provided on the perforated plate. Examples of the adsorbent include activated carbon.

  An inlet 17 for the volatile organic compound-containing gas A is provided at the upper end side of the adsorption layer 11 of the adsorption tower 11, and the concentration of the volatile organic compound is adsorbed by the adsorbent at the lower end side of the adsorption layer 12. A post-treatment gas B outlet 18 is provided. The discharge port 18 discharges into the atmosphere.

  In addition, supply ports 15a to 15c for desorption water vapor F having a plurality of stages (a total of three stages in FIG. 1) are provided on a side surface and a lower end of a portion where the adsorption layer 12 of the adsorption tower 11 is provided. The uppermost supply port 15 a is located above the center in the vertical direction of the adsorption layer 12 and below the porous plate 20 at the upper end of the adsorption layer 12, and the lowermost supply port 15 c is lower than the lower end of the adsorption layer 12. Located below. Further, an outlet 16 for extracting the vapor organic compound accompanying gas K from which the organic compound has been desorbed is provided on the upper end side of the upper end of the adsorption layer 12.

  The combustion furnace 13 generates heat for generating the desorption water vapor F, and is accompanied by the water vapor organic compound sent from the fuel supply port 21 for supplying the fuel D and the outlet 16 of the adsorption tower 11. It has a contained gas supply port 22 for supplying the gas K, a burner (not shown), a chimney 61, and a combustion furnace temperature sensor 24 for measuring the internal temperature. The heat generated in the combustion furnace 13 is supplied to the heat exchanger 14 through the high temperature gas supply passage 41 as the generated high temperature gas L. Since the high temperature gas L is obtained by burning an organic compound, water vapor and carbon dioxide are the main components. Among these, carbon dioxide is a gas at normal temperature and normal pressure, and even if supplied to the adsorption tower 11 through a pipe to be described later, it is not adsorbed by the adsorbent, and is volatile without being condensed even when cooled in contact with the adsorbent. Organic compounds can be transferred. Moreover, since water vapor | steam is contained, the desorption water vapor | steam mentioned later can be saved. Furthermore, since oxygen is reduced by combustion, deterioration of the adsorbent can be reduced.

  The heat exchanger 14 is provided with a water supply port 26 that supplies water E that is the source of water vapor, and supplies desorption water vapor F obtained by heating the water E to the supply ports 15 a to 15 c of the adsorption tower 11. The desorption water vapor supply path 25 and the water vapor temperature sensor 28 that measures the internal temperature of the desorption water vapor supply path 25 are provided. The water supply port 26 has a function of spraying water E into the desorption water vapor supply path 25. Further, the high temperature gas L supplied to the heat exchanger 14 is cooled by passing heat to the water E, and becomes a lower temperature exhaust gas M and is discharged from the exhaust gas discharge path 53. The components of the exhaust gas M are the same as those of the high temperature gas L described above.

  The desorption water vapor supply path 25 from which the water vapor F generated in the heat exchanger 14 is extracted is branched (27a, 27b) on the way, and one branch 27b is connected to the opening 29 to the atmosphere, and the branch 27a And the heat exchanger 14 form a circulation path. Further, the high temperature gas supply passage 41 that leads from the combustion furnace 13 to the heat exchanger 14 has a high temperature gas branch point 43 that branches in the middle. The other branched hot gas introduction path 42 leads to the desorption steam supply path 25 so that the hot gas L can be mixed with the steam F. Furthermore, the exhaust gas discharge path 51 of the exhaust gas M discharged from the heat exchanger 14 to the exhaust gas discharge path 53 has an exhaust gas branch point 54 that branches in the middle. The other branched exhaust gas introduction path 52 leads to the desorption water vapor supply path 25, and the exhaust gas M can be mixed with the water vapor F. Therefore, the steam F can be mixed with both the high temperature gas L and the exhaust gas M.

  Further, although not shown in the drawing, the desorption water vapor supply path 25 may separately have a pipe capable of introducing a gas that is a gas at normal temperature and pressure. Examples of such a gas include air, nitrogen, and argon. Furthermore, since these gases are not adsorbed by the adsorbent, the volatile organic compound can be reliably transferred even if supplied into the adsorption tower 11. Of these, use of nitrogen is particularly safe. These may be introduced at room temperature, but if heated to the exhaust gas M or high-temperature gas L and supplied to the pipe to be introduced, the temperature of the mixed gas G including the desorption water vapor F is kept high. Is preferable.

  In the volatile organic compound processing apparatus according to the present invention, first, the volatile organic compound contained in the volatile organic compound-containing gas A introduced into the adsorption tower 11 is adsorbed by the adsorbent of the adsorption layer 12. The treated gas B that has passed through the adsorption layer 12 exits from the outlet and is released into the atmosphere. This adsorption work is performed until a certain period of time elapses or until the adsorption capacity becomes below a certain level. In order to stop the adsorption by detecting a decrease in the adsorption capacity, a volatile organic compound detection device (not shown) is provided at the discharge port 18 where the concentration of the volatile organic compound contained in the gas B after the treatment is determined. A control circuit is provided that, when measured and exceeds a predetermined value, interprets that the adsorption capacity of the adsorption layer 12 has reached its limit and issues a command to close the valve of the inlet 17.

  On the other hand, preparation for desorption is proceeded before the adsorption is completed. Since the desorption water vapor F cannot be supplied immediately, if heating is started after the completion of adsorption, a time lag occurs before the desorption begins, and the originally necessary adsorption process is stopped. In addition, when there are two or more adsorption towers 11, the adsorption process can be performed on the other side even if the adsorption process is stopped on one side, but in that case, the desorption water vapor F is always prepared.

  This desorption process will be described with reference to the flow of FIG. First, combustion of the fuel D is started in the combustion furnace 13, and the air in the circulation path of the desorption water vapor supply path 25 is circulated by a fan (not shown) provided in the path (S11). When the water control circuit 30 detects the air temperature at this time with the water vapor temperature sensor 28 and confirms that the water control circuit 30 has reached the set temperature T1 or higher at which water vapor can be generated (S12), the desorption water vapor that returns to the heat exchanger 14 from the branch 27a. The valve of the water supply port 26 of the water E into the supply path 25 is opened, and the water E is sprayed to generate water vapor in the heat exchanger 14 (S13). In the heat exchanger 14, the temperature of the water vapor generated by the water vapor temperature sensor 28 is detected, and the opening 29 is maintained until the desorption water vapor F reaches a temperature T2 suitable for desorption (S14) or until the adsorption is completed. The valve is opened and released into the atmosphere (S15). This is because desorption is an endothermic reaction, and desorption does not proceed quickly unless the steam is sufficiently hot. Here, the desorption water vapor F is superheated water vapor or saturated water vapor. Further, a part of the desorption water vapor F branched at the branch 27 a passes through the path of the water supply port 26 and circulates to the heat exchanger 14.

  In addition, the high temperature gas L can be introduced from the high temperature gas introduction path 42 and the exhaust gas M can be introduced from the exhaust gas introduction path 52 into the desorption water vapor supply path 25. Only one or both may be introduced. However, it is desirable to close these inlet valves until the desorption water vapor F is sufficiently warmed.

  The temperature of the high-temperature gas L is not particularly limited, but when it is 650 ° C. or higher, it is easy to generate water vapor in the heat exchanger 14 and is preferably 700 ° C. or higher. On the other hand, if the temperature is too high, the device is liable to be damaged. Therefore, the temperature is preferably 900 ° C. or lower, preferably 850 ° C. or lower, and more preferably 800 ° C. or lower. When the gas directly discharged from the combustion furnace 13 is at a high temperature, the temperature may be lowered by mixing with air, adjusted to the above temperature range, and then introduced into the heat exchanger 14. Further, the temperature of the exhaust gas M is preferably about 150 ° C. or higher and 300 ° C. or lower, although it depends on the setting of the heat exchanger. Even when any gas is introduced through the respective introduction paths (42, 52), the temperature is basically higher than the temperature required for desorption, and therefore the temperature of the mixed gas G obtained by mixing by these introductions. The amount of heat required for climbing can be saved.

  When the adsorption in the adsorption tower 11 is completed and the desorption water vapor F becomes equal to or higher than the predetermined temperature T2 (S14), the open port control circuit 31 closes the valve to the open port 29, and the high temperature gas introduction path 42, The exhaust gas introduction path 52, other gas introduction paths, or a plurality of valves thereof are opened, and the desorption water vapor F is mixed with components that are gases at normal temperature and normal pressure to generate a mixed gas G (S16). . Next, the valve of the mixed gas G to the supply port 15a closest to the outlet 16 is opened (S17). The mixed gas G supplied to the supply port 15a desorbs the volatile organic compound adsorbed on the upper layer portion of the adsorption layer 12, and is supplied from the outlet 16 as the vapor organic compound accompanying gas K (S18). At this time, since the gas that is gaseous at normal temperature and pressure, such as carbon dioxide, contained in the mixed gas G does not condense, the desorbed component of the volatile organic compound is pushed to the pressure at which the gas is supplied from the supply port 15a. , Or accompanied, and promptly delivered from the outlet 16. Here, the closer the supply port 15a is to the upper end of the adsorption layer 12, the shorter the time it takes for the desorbed vapor organic compound accompanying gas K to pass through the adsorption layer 12 and reach the upper outlet 16 is. Eventually, the time until the steam organic compound-entrained gas K reaches the contained gas supply port 22 that leads from the outlet 16 to the combustion furnace 13 (S19) is also shortened.

  When the steam organic compound entrained gas K reaches the combustion furnace 13 (S19), the total amount of combustibles supplied to the combustion furnace 13 increases, so the temperature in the combustion furnace 13 rises. This temperature rise is detected by the combustion furnace temperature sensor 24. A specified temperature T3 that is defined as exceeding the error in temperature rise during combustion of only fuel D is previously defined in the fuel control circuit 33, and when the temperature detected by the combustion furnace temperature sensor 24 is equal to or higher than T3 (S20). ) Considering that the combustibles have increased due to the arrival of the vapor organic compound accompanying gas K, the valve of the fuel D supplied to the fuel supply port 21 is throttled to save the fuel D (S21).

  However, since the organic compound contained in the steam organic compound accompanying gas K decreases as the volatile organic compound adsorbed in the vicinity of the supply port 15a is gradually desorbed, the supply port 15b on the side closer to the supply port 16 sequentially. The valve 15c is opened so that the amount of the volatile organic compound supplied to the combustion furnace 13 is not excessively reduced. The opening timing may be determined by the elapsed time since the supply port 15a closest to the outlet 16 is opened, or the temperature decrease defined by the combustion furnace temperature sensor 24 of the combustion furnace 13 is determined in advance. As shown, that is, when it is detected that the amount of combustible material to be burned has decreased, it may be opened sequentially. When the temperature drop is detected, if the supply port control circuit 32 that preliminarily defines the furnace temperature T4 that should be dealt with by reducing combustible materials detects the temperature drop of the combustion furnace temperature sensor 24 (S22), the supply is performed. Among the unopened valves of the ports 15b to 15c, the valve on the outlet 16 side (upper end side) is opened (S23 to S24). One valve is opened, and once the furnace temperature rises, the furnace temperature is monitored again, and when the temperature drop is detected, the next valve is opened. If there are supply ports 15X in more stages than in FIG. 1, this continues until all the supply ports are opened (S25). When the next valve is opened, the supply port valve that has been opened is closed.

  When the time t1 at which the desorption in the adsorption layer 12 sufficiently proceeds has elapsed after all the supply ports 15X have been opened (S26), all the supply ports 15X are closed to complete the desorption (S27). If there is only one adsorption tower 11, the valve of the fuel supply port 21 for supplying the fuel D is closed, and the combustion in the combustion furnace 13 is terminated (S28). In addition, the valve of the outlet 16 is also closed. Excess desorption water vapor F still generated in the heat exchanger 14 is released into the atmosphere by opening the valve of the opening 29 (S29). Further, the valves of the high temperature gas introduction path 42 and the exhaust gas introduction path 52 are also closed (S30).

  Thus, the desorption of the adsorption tower 11 is completed, and the adsorption layer 12 can be again adsorbed. Therefore, the inlet 17 of the volatile organic compound-containing gas A is opened to start the adsorption, and the adsorption is performed for a certain time. After that, desorption is performed in the same procedure as described above.

  In the embodiment when carrying out the present invention, the positions of the supply ports 15 a to 15 c, the supply port 16, the introduction port 17, and the discharge port 18 provided in the adsorption tower 11 may be reversed in the vertical direction. Further, in principle, the present invention can also be implemented in a form in which the adsorption tower 11 is oriented in the horizontal direction and rotated 90 degrees from the form shown in the figure. Whatever direction the adsorption tower 11 faces, the inlet 17 for introducing the volatile organic compound-containing gas A to the adsorption tower 11 and the outlet 16 for delivering the steam organic compound-containing gas K are adsorbed. There is no change in the form in which the exhaust port 18 for exhausting the treated gas B on one end side (one end side) of the tower 11 is located on the other end side (other end side). In addition, supply ports 15a, 15b,... 15x are provided in a plurality of stages in both end directions, and the supply port 15a closest to one end, that is, the side closest to the outlet 16 is the adsorption tower 11. The present invention can be effectively implemented as long as it is provided on the side surface of the position occupied by the adsorption layer 12. By opening from the supply port 15a located on the most end side, the mixed gas G is introduced from the middle of the adsorption layer 12, and the desorbed volatile organic compound is promptly placed on the one end side by the extrusion gas. It can be extracted to the outlet 16.

  Another embodiment includes an embodiment provided with two adsorption towers 11. In the above-described embodiment in which the adsorption tower 11 is a single unit, the treatment of the volatile organic compound-containing gas A cannot be performed during desorption. Therefore, the treatment must be temporarily stopped and stored. When two adsorption towers 11 are provided, the adsorption can be started with another unit while the adsorption is completed with one unit and the desorption is started, so that the time required for the desorption is shorter than the time that can be adsorbed. Thus, the processing of the volatile organic compound-containing gas A can be continued without stopping. In order to realize this embodiment, the control circuit is prepared so that ports for supplying and discharging to each adsorption tower 11 are provided, and individual valves can be operated independently.

  FIG. 3 shows adsorption and desorption procedures in an embodiment provided with two such adsorption towers 11. First, the adsorption in the adsorption tower β starts with the completion of the adsorption in the adsorption tower α. By the time the adsorption capacity of the adsorption tower β is lowered, desorption is started with respect to the adsorption layer 12 of the adsorption tower α. First, the supply port 15a is opened to introduce the mixed gas G (S17). When the first steam organic compound entrained gas K reaches and the temperature of the combustion furnace 13 rises, the supply amount of the fuel D is reduced (S21). . Thereafter, the temperature drop (S22) of the combustion furnace 13 is detected, and the supply ports 15b to 15c are sequentially opened (S23, S24), and the desorption of the adsorption layer 12 is advanced. When the desorption proceeds sufficiently, the introduction of the mixed gas G to the adsorption tower α is stopped (S41). Since the steam organic compound entrained gas K does not reach the combustion furnace 13, the supply amount of the fuel D is once recovered to compensate for the shortage of combustion substances (S42), and the combustion is maintained. Further, during this time, the desorption water vapor F is always generated, but the supply ports 15a to 15c are all closed, so that they are circulated from the branch 27a to the heat exchanger 14 or opened from the open port 29 as appropriate. When the adsorption in the adsorption tower β is completed, the adsorption in the adsorption tower α whose function is recovered by desorption is started, and the supply of the mixed gas G to the adsorption tower β is started in the meantime, and the desorption is performed in the same manner. .

Next, the present invention will be described more specifically by examples of actual implementation of the present invention.
Adsorption tower dimensions: 630W × 800L × 1055H, packed part: 630W × 800L × 700H (volume: 352.8L), activated carbon weight: 151.7 kg (Shirakaba S2x 4/6), as shown in FIG. The configuration was Specifically, it is assumed that exhaust gas from the exhaust gas introduction path 52 can be mixed with the desorption water vapor that has come out of the heat exchanger 14, and a valve is provided so that the mixed gas can be supplied to the adsorption tower. Further, the gas containing the volatile organic compound delivered from the outlet 16 of the adsorption tower is sent to the combustion furnace 13. In addition, the supply port 15 is only two places, a side surface (15a) and a bottom face (15c).

(Example)
A gas containing toluene as a volatile organic compound was passed through the adsorption tower 11 in advance, and toluene was sufficiently adsorbed on activated carbon as an adsorbent. At the same time, the fuel was burned in the combustion furnace 13, and high-temperature gas whose temperature was adjusted to 735 ° C. was introduced into the heat exchanger 14 to generate water vapor. The mixed gas was produced by mixing with the exhaust gas at 200 to 250 ° C. discharged from the heat exchanger 14. The mixing ratio was a volumetric flow rate ratio of steam: exhaust gas = 6: 1 to 1: 1, and the temperature of the mixed gas was 140 to 150 ° C.

  After completion of the adsorption, a mixed gas was introduced from the supply port 15a of the adsorption tower 11, and a steam organic compound-entrained gas K containing toluene was discharged from the outlet 16 at the top of the tower. Moreover, introduction of mixed gas was also started from the supply port 15c at the bottom after 10 minutes from the start of introduction. The temperature change of the combustion furnace at this time is shown in FIG. After 7 minutes from the introduction, the temperature of the combustion furnace 13 began to rise, indicating that the volatile organic compound has reached the combustion furnace at this point. Further, 15 minutes after the introduction, a temperature rise that seems to have started to arrive at the volatile organic compound desorbed from the entire adsorption layer was detected, but the rise was moderate.

(Comparative example)
In Example 1, desorption was performed by the same procedure except that the exhaust gas was not mixed and the same amount of desorption water vapor as the mixed gas was supplied. The temperature change of the combustion furnace at that time is shown in FIG. Despite the introduction of water vapor from the side, the temperature of the combustion furnace does not increase until 17 minutes have elapsed, and there is a waiting time until the volatile organic compound that should have been desorbed reaches the combustion furnace. Indicated. Further, the temperature rise after 17 minutes is rapid, and the combustion furnace may be damaged unless the amount of fuel supplied to the combustion furnace is quickly suppressed.

DESCRIPTION OF SYMBOLS 11 Adsorption tower 12 Adsorption layer 13 Combustion furnace 14 Heat exchanger 15a-15c Supply port 16 Supply port (Water vapor organic compound accompanying gas)
17 Inlet (volatile organic compound-containing gas)
18 Outlet (Gas after treatment)
20 perforated plate 21 fuel supply port 22 containing gas supply port 24 combustion furnace temperature sensor 25 desorption water vapor supply path 26 water supply port 27a, 27b branch 28 water vapor temperature sensor 29 open port 30 water control circuit 31 open port control circuit 32 supply port Control circuit 33 Fuel control circuit 41 High-temperature gas supply path 42 High-temperature gas introduction path 43 High-temperature gas branch point 51 Exhaust gas discharge path 52 Exhaust gas introduction path 53 Exhaust gas discharge path 54 Exhaust gas branch point 61 Chimney A Volatile organic compound-containing gas B Processed gas D Fuel E Water F Desorption steam G Mixed gas H Discharged steam K Steam organic compound accompanying gas L Hot gas M Exhaust gas

Claims (4)

An adsorption tower having an adsorption layer filled with an adsorbent that adsorbs a volatile organic compound, and capable of supplying a desorption gas for desorbing the volatile organic compound from the adsorption layer;
A combustion furnace capable of using the desorbed volatile organic compound as a part of the fuel;
A heat exchanger that generates water vapor by exchanging heat between the high-temperature gas and water generated in the combustion furnace,
As the desorption gas, using a mixed gas obtained by mixing an extrusion gas containing a component that is a gas at normal temperature and pressure with the water vapor,
The hot gas exhaust gases after heat exchange have a pipe that is supplied as the extrusion gas at the heat exchanger,
An organic compound processing apparatus capable of supplying the mixed gas to the adsorption tower after reaching a predetermined temperature .   The organic compound processing apparatus of Claim 1 which has piping which supplies the high temperature gas produced | generated with the said combustion furnace as said extrusion gas. The organic compound processing apparatus according to claim 1 , wherein the mixed gas can be circulated through a path including the heat exchanger. As the supply port to the desorption water vapor adsorption tower consists of multiple stages divided in both end directions,
It is a method of operating the organic compound processing apparatus according to any one of claims 1 to 3, wherein a supply port on one end side of the adsorption tower is provided on a side surface at a position occupied by the adsorption layer inside the adsorption tower. ,
Open from the supply port located at one end of the adsorption tower, introduce the mixed gas from the middle of the adsorption layer, and desorb the vapor organic compound entrained gas that has taken in the volatile organic compound from the one end side of the adsorption tower. Supply to the combustion furnace
Operation method of organic compound processing equipment.

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