JP5579630B2 - Carbon dioxide recovery system - Google Patents

Description

  The present invention relates to a carbon dioxide recovery system.

The problem of global warming due to greenhouse gas emissions has been widely recognized. Examples of greenhouse gases include carbon dioxide (CO ₂ ), methane (CH ₄ ), and chlorofluorocarbons (CFCs), but carbon dioxide is the one that has a large emission amount and has a substantial effect on its emission. Reduction of volume is an urgent issue.

  JP 2007-284272 A discloses an absorption tower that removes carbon dioxide by contacting an exhaust gas containing carbon dioxide with a carbon dioxide absorbing liquid, a regeneration tower that regenerates a rich solution that has absorbed carbon dioxide, A carbon dioxide recovery device that reuses a lean solution from which carbon dioxide has been removed in a regeneration tower, in an absorption tower, wherein the absorption tower absorbs carbon dioxide in exhaust gas with a carbon dioxide absorbent, A cooling unit that is provided on the upper side of the carbon dioxide recovery unit, cools the gas from which carbon dioxide has been removed, collects the accompanying carbon dioxide absorption liquid, and includes a carbon dioxide absorption liquid condensed in the water washing unit. The carbon dioxide absorbing liquid is supplied to a circulation line that circulates water directly from the top of the water washing section, and a lean solution supply pipe that supplies the lean solution from the regeneration tower to the absorption tower. Carbon dioxide recovery apparatus is disclosed comprising a surplus condensed water supplying line for supplying the surplus condensed water containing.

  Currently, the carbon dioxide recovery technology using a carbon dioxide absorbing solution described in JP-A-2007-284272 has begun to be used, but the carbon dioxide absorbing solution is running due to problems such as volatilization loss of the solution during the regeneration of the absorbing solution. Cost is high.

  Therefore, development of a solid carbon dioxide capturing material having a relatively low running cost because there is no volatilization loss of the absorbing liquid (JP-A-5-131116, JP-A-2004-261670, JP-A-2001-70726, Japanese Patent Laid-Open No. 8-40715) is also underway.

  Japanese Patent Laid-Open No. 5-131116 discloses a carbon dioxide capturing method in which carbon dioxide or a carbon dioxide-containing gas is brought into contact with a transition metal-supported zeolite at about 20 to 100 ° C.

  JP-A-2004-261670 discloses that exhaust gas containing carbon dioxide and moisture is brought into contact with a support chemically bonded with a silane coupling agent to selectively capture and desorb carbon dioxide. Although a treatment method is disclosed, since the disclosed solid carbon dioxide capturing material chemically reacts with carbon dioxide to greatly change the structure of carbon dioxide to produce a compound, the reaction rate is slow and the reaction takes time.

  Japanese Patent Laid-Open No. 2001-70726 discloses a carbon dioxide capturing method in which carbon dioxide or a carbon dioxide-containing gas is brought into contact with a capturing material mainly composed of magnesium oxide at about 300 to 500 ° C.

  JP-A-8-40715 discloses a capturing material that captures carbon dioxide in contact with a porous material obtained by drying potassium carbonate containing hydrate as a capturing material.

JP 2007-284272 A JP-A-5-131116 JP 2004-261670 A JP 2001-70726 A JP-A-8-40715

  However, any of the techniques described in JP 2007-284272 A, JP 5-131116 A, JP 2004-261670 A, JP 2001-70726 A, and JP 8-40715 A However, no consideration is given to the temperature increase due to the heat of reaction of the carbon dioxide capture reaction when using a solid carbon dioxide capture material, and the decrease in the amount of carbon dioxide captured by the carbon dioxide supplement material due to this temperature increase.

  The object of the present invention is to improve the efficiency of a carbon dioxide recovery system by suppressing a decrease in the amount of captured carbon dioxide due to a rise in temperature of the container containing the capture material and the capture material when a solid carbon dioxide capture material is used. It is to provide a carbon dioxide recovery system.

  The carbon dioxide recovery system of the present invention is a carbon dioxide recovery system that captures and separates carbon dioxide from a carbon dioxide-containing gas containing carbon dioxide using a solid carbon dioxide capture material, and a container that contains a solid capture material; A cooling pipe serving as a first cooling means for flowing down a cooling medium for cooling the supplementary material is disposed inside a wall member forming the container, and the cooling medium is circulated through the cooling pipe and is accommodated in the container. Further, the invention is characterized in that it is configured to suppress an increase in temperature of the capturing material.

The carbon dioxide recovery system of the present invention is a carbon dioxide recovery system that captures and separates carbon dioxide from a carbon dioxide-containing gas containing carbon dioxide using a solid carbon dioxide capture material.
A container for storing a solid capturing material, and a cooling pipe serving as a first cooling means for flowing a cooling medium for cooling the supplementary material inside a wall member forming the container, and the wall member of the container A second cooling means for cooling the cooling medium is disposed upstream of the flow path for supplying the cooling medium to the first cooling means disposed in the interior of the trapping material. It is characterized by being configured to suppress an increase in temperature.

  According to the present invention, when a solid carbon dioxide capturing material is used, the decrease in the amount of captured carbon dioxide due to the temperature rise of the capturing material and the container containing the capturing material is suppressed to improve the efficiency of the carbon dioxide recovery system. A carbon dioxide recovery system can be realized.

The schematic block diagram which shows the carbon dioxide collection system which isolate | separates and collects a carbon dioxide from the carbon dioxide containing gas which is the reference example 1 of this invention. The characteristic view showing the time-dependent change of the temperature distribution of a carbon dioxide capture material. The fragmentary sectional view which shows the condition which cut | disconnected the container which contains the carbon dioxide capture material in the carbon dioxide collection system of the reference example 1 shown in FIG. 1 in parallel with the carbon dioxide containing gas distribution direction. The fragmentary sectional view which shows the condition which cut | disconnected the container which contains the carbon dioxide capture material in the carbon dioxide collection system of the reference example 1 shown in FIG. 1 in parallel with the carbon dioxide containing gas distribution direction. The state which cut | disconnected the container which contains the carbon dioxide capture material in the carbon dioxide recovery system which isolate | separates and collects carbon dioxide from the carbon dioxide containing gas which is 1st Example of this invention in parallel with the carbon dioxide containing gas distribution direction is shown. FIG. 5 is a partial cross-sectional view illustrating a schematic configuration of a control device that controls a flow rate of a cooling medium flowing through a cooling pipe for cooling a carbon dioxide capturing material inside the container. A plurality of containers containing a carbon dioxide capturing material in a carbon dioxide recovery system for separating and recovering carbon dioxide from a carbon dioxide-containing gas according to a second embodiment of the present invention are installed, and these containers are used to distribute carbon dioxide-containing gas. It is the fragmentary sectional view which showed the situation cut | disconnected in parallel with the direction, and the figure which showed together schematic structure of the control apparatus which controls the flow volume of the cooling medium which flows through the cooling piping which cools the carbon dioxide capture material inside a container . The schematic block diagram which shows the carbon dioxide collection system which isolate | separates and collects a carbon dioxide from the carbon dioxide containing gas which is the reference example 2 of this invention. The figure which shows various conditions used when calculating the temperature distribution of the capture | acquisition material at the time of a carbon dioxide capture. The figure which shows the maximum temperature of the carbon dioxide capture material in each carbon dioxide capture reaction heat.

  The carbon dioxide recovery system using the solid carbon dioxide capturing material targeted by the present invention is a method that can solve the problem of deterioration of the absorption liquid that occurs in the carbon dioxide recovery system using the carbon dioxide absorption liquid. Development of carbon dioxide capture materials has been promoted.

  On the other hand, as a result of intensive studies by the inventors, when a solid carbon dioxide capturing material is used, the temperature of the container containing the capturing material and the capturing material increases excessively due to the capture reaction heat at the time of capturing the carbon dioxide. It has been found that there is a possibility of reducing the amount of capture.

  Therefore, the carbon dioxide-containing gas before capturing carbon dioxide is cooled in advance, or the container containing the carbon dioxide capturing material is appropriately cooled at the time of carbon dioxide capturing reaction. Reduction can be suppressed.

  As a method of cooling the container containing the carbon dioxide capturing material, a method of directly cooling the wall member of the container or a cooling pipe disposed in the wall member of the container and allowing a cooling medium to flow through the cooling pipe. There is a method of cooling.

  The arrangement method of arranging the cooling pipe in the container containing the carbon dioxide capturing material may be arranged along the flow direction of the carbon dioxide-containing gas, or upstream of the flow direction of the carbon dioxide-containing gas. The cooling pipe may be arranged in each stage divided into several stages from the downstream to the downstream.

Further, as a solid carbon dioxide capturing material for adsorbing and separating carbon dioxide from a carbon dioxide-containing gas, for example, inorganic oxides such as silica, alumina, titania, zirconia, ceria, and zeolite may be used, or MOFs (Metal-Organic Frameworks) and ZIFs (Zeolytic Imidazolate Frameworks), or an organic metal compound, an alkali metal carbonate, an alkali metal hydrogen carbonate, an alkaline earth metal carbonate, or an alkaline earth metal hydrogen carbonate may be used. These may be heat-treated.
[ Reference Example 1 ]

A carbon dioxide recovery system using a solid carbon dioxide capturing material as Reference Example 1 of the present invention will be described with reference to FIGS.

In the carbon dioxide recovery system using the solid carbon dioxide capturing material, which is Reference Example 1 of the present invention shown in FIG. 1, contains carbon dioxide supplied through a carbon dioxide containing gas flow path 1 provided with an opening / closing valve 4a. Four containers 5 containing solid carbon dioxide capturing material 8 for capturing and separating carbon dioxide from the gas to be separated are installed in parallel.

  As the solid carbon dioxide capturing material 8, as described above, for example, inorganic oxides such as silica, alumina, titania, zirconia, ceria and zeolite may be used, MOFs (Metal-Organic Frameworks), An organic metal compound such as ZIFs (Zeolytic Imidazolate Frameworks), an alkali metal carbonate, an alkali metal hydrogen carbonate, an alkaline earth metal carbonate, or an alkaline earth metal hydrogen carbonate may be used. It may be used.

  Carbon dioxide gas is supplied to the containers 5 containing the solid carbon dioxide capturing materials 8 installed in the four units through the high-purity carbon dioxide gas flow path 2 provided with the opening / closing valve 4b. Water vapor gas is supplied to each of the containers 5 through the water vapor gas flow path 3 provided with the opening / closing valve 4c.

  The four containers 5 containing the solid carbon dioxide capturing material installed have the same function, and the carbon dioxide capturing process, carbon dioxide purging process, carbon dioxide desorption process and cooling in the carbon dioxide recovery system. The four processes are repeated in sequence.

  In the first carbon dioxide capturing process, the carbon dioxide-containing gas supplied through the carbon dioxide-containing gas flow path 1 is operated by operating the on-off valve 4a and including the four containers 5 containing the solid carbon dioxide capturing material 8. The carbon dioxide contained in the carbon dioxide-containing gas is captured by the carbon dioxide capturing material 8 through only one container 5. The gas after the carbon dioxide is removed is discharged into the atmosphere through the carbon dioxide removal gas flow path 6 disposed on the outlet side of the container 5 by operating the opening / closing valve 35.

  In the second carbon dioxide purge process, the carbon dioxide-containing gas flow path is operated by operating the opening / closing valve 4a to the container 5 containing the carbon dioxide capturing material 8 in which the carbon dioxide capturing amount is saturated among the four containers 5. The distribution of the carbon dioxide-containing gas supplied through 1 is stopped.

  Next, the open / close valve 4 b is operated to circulate carbon dioxide supplied through the high-purity carbon dioxide gas flow path 2 into the container 5 to purge gases other than carbon dioxide from the container 5. At this time, the gas discharged from the container 5 is discharged into the atmosphere through the carbon dioxide removal gas channel 6 by operating the opening / closing valve 35.

  Finally, the on-off valve 4b and the on-off valve 35 are operated to stop the flow of carbon dioxide gas into the container 5 and the discharge of carbon dioxide removal gas from the container 5, respectively.

  In the third carbon dioxide desorption process, the open / close valve 4 c is operated to supply water vapor gas to the container 5 through the water vapor gas flow path 3 to raise the temperature of the container 5.

  By circulating water vapor through the water vapor gas flow path 3 to the container 5, carbon dioxide trapped in the solid carbon dioxide capturing material 8 accommodated in the container 5 is desorbed, and the open / close valve 36 is operated. The carbon dioxide is recovered from the carbon dioxide capturing material 8 through the carbon dioxide recovery flow path 7 disposed at the outlet of the container 5.

  In the fourth cooling process, the solid carbon dioxide capturing material 8 and the container 5 containing the carbon dioxide capturing material 8 are cooled by a cooling medium supplied through a cooling pipe 11. By repeating the above four processes in each of the four containers 5 containing the solid carbon dioxide supplement material 8, the carbon dioxide contained in the carbon dioxide-containing gas is continuously desorbed and recovered. obtain.

  The amount of the solid carbon dioxide capturing material 8 required in one container 5 is the distribution time of the carbon dioxide containing gas, the circulation amount of the carbon dioxide containing gas in the first carbon dioxide capturing process, and the carbon dioxide containing amount. What is necessary is just to determine with the carbon dioxide concentration of gas.

The carbon dioxide recovery system of this Reference Example 1 that recovers carbon dioxide using a solid carbon dioxide capturing material that captures and separates carbon dioxide from a gas containing carbon dioxide includes a carbon dioxide capture process, a carbon dioxide purge process, carbon dioxide The four processes of the desorption process and the cooling process are configured as one cycle.

  Assuming that one cycle is operated for 120 minutes, that is, one process is operated for 30 minutes, the temperature distribution of the trapping material at the time of capturing carbon dioxide was calculated as one-dimensional thermal fluid under various conditions shown in FIG. The conditions described in FIG. 8 are modeled on exhaust gas from a 1000 MW class thermal power plant. However, it was assumed that the container 5 containing the carbon dioxide capturing material 8 is thermally insulated.

  FIG. 9 shows the maximum temperature of the carbon dioxide capturing material at various heats of carbon dioxide capturing reaction. Moreover, the calculation result of the carbon dioxide supplement material temperature distribution at the time of using the carbon dioxide capture material whose carbon dioxide capture reaction heat is 10 kcal / mol was shown in FIG.

  As shown in FIG. 9, the carbon dioxide capture material temperature of the carbon dioxide recovery system is up to 147 ° C. even when a carbon dioxide capture material of 10 kcal / mol, which is very low as the heat of capture reaction, is used. It turned out to rise.

  Since the carbon dioxide capture material having a carbon dioxide capture temperature of 50 ° C. is normally assumed to desorb carbon dioxide at around 120 to 150 ° C., the carbon dioxide capture material has a carbon dioxide capture temperature of 147 ° C. It can be predicted that the carbon capture amount will be greatly reduced.

Therefore, in order to cope with a reduction in the amount of carbon dioxide captured by the carbon dioxide capturing material, as described in the carbon dioxide recovery system of this embodiment, a cooling means is installed in the carbon dioxide recovery system, or the present invention described later. As described in the carbon dioxide recovery system that is Reference Example 2 , the cooling means is installed in the carbon dioxide recovery system, and another cooling means is also required to be installed in the previous stage of the carbon dioxide recovery system. .

  As can be understood from the graph showing the change over time of the temperature distribution of the carbon dioxide trapping material shown in FIG. 2, it can be seen that a high temperature portion and a low temperature portion are generated in the carbon dioxide trapping material. For example, after the carbon dioxide-containing gas is circulated through the carbon dioxide capturing material for 20 minutes, the capture reaction heat is not generated when the carbon dioxide capturing material reaches the carbon dioxide capturing saturation in the upstream portion of the gas flow. Since the carbon dioxide-containing gas at 0 ° C. continues to flow, the carbon dioxide capturing material is cooled.

In the most downstream portion of the gas flow, which is the position of the carbon dioxide capturing material, no carbon dioxide capturing reaction occurs, so no reaction heat is generated, and the temperature of the carbon dioxide capturing material remains low. On the other hand, between the upstream part and the downstream part of the gas flow that is the position of the carbon dioxide capturing material, the carbon dioxide capturing material captures carbon dioxide and the temperature rises due to reaction heat, and the carbon dioxide content that circulates from the upstream part The gas cooling effect is also small. Accordingly, since a temperature distribution is generated in the carbon dioxide capturing material, it is possible to efficiently cool the carbon dioxide capturing material by installing an appropriate cooling means.
Next, the carbon dioxide recovery system using the solid carbon dioxide capturing material which is Reference Example 1 of the present invention will be described in more detail.

In the carbon dioxide recovery system of the first reference example shown in FIG. 1, solid carbon dioxide capturing materials 8 are accommodated in the containers 5 installed in parallel, and supplied to the containers 5. The carbon dioxide-containing gas is supplemented by the solid carbon dioxide capturing material 8.

As shown in detail in the partial sectional view of FIG. 3, the container 5 containing the solid carbon dioxide capturing material 8 is on the outer wall side of the carbon dioxide capturing material 8 on the inner wall side inside the wall member 9 of the container 5. The cooling pipe 11 for circulating the cooling medium is disposed in a spiral shape in the circumferential direction of the container 5 in the region located at the outer peripheral side of the cooling pipe 11 inside the wall member 9 of the container 5. A plurality of other cooling pipes 10 for circulating the cooling medium are arranged in the vertical direction along the longitudinal direction of the container 5.

  As shown in FIG. 1, the container 5 has a carbon dioxide-containing gas flow path 1 having an opening / closing valve 4a for supplying a carbon dioxide-containing gas to the container 5, and a high purity for purging gases other than carbon dioxide. High-purity carbon dioxide gas flow path 2 provided with open / close valve 4b for supplying carbon dioxide gas to container 5 and steam for raising the temperature of container 5 in order to desorb carbon dioxide captured by carbon dioxide capturing material 8 A water vapor gas flow path 3 having a supply opening / closing valve 4c is provided.

  The container 5 is provided with an open / close valve 35 that discharges the gas, which is captured by the carbon dioxide capturing material 8 installed in the container 5 and from which the carbon dioxide has been removed, to the atmosphere. A removal gas channel 6 is provided.

  Further, the carbon dioxide removal gas flow path 6 is a gas other than carbon dioxide from the container 5 when the carbon dioxide supplied from the high purity carbon dioxide gas flow path 2 is circulated to purge a gas other than carbon dioxide. It is also used as a flow path for discharging gas into the atmosphere.

  An opening / closing valve 36 is provided in the container 5 to desorb carbon dioxide captured by the carbon dioxide capturing material 8 by temperature rise by water vapor supplied from the water vapor gas flow path 3 and recover the separated carbon dioxide. A carbon dioxide recovery flow path 7 is provided.

FIG. 4 is a partial cross-sectional view of the container 5 containing the carbon dioxide capturing material 8 in the carbon dioxide recovery system of the first reference example cut in parallel to the flow direction of the carbon dioxide-containing gas. Is disposed through the container 5 and the container wall member 9, and the cooling medium flowing through these cooling pipes 11 is adjusted to effectively cool the container 5 and the carbon dioxide capturing material 8 accommodated in the container 5. There are things.

  When the temperature of the carbon dioxide capturing material 8 that captures carbon dioxide from the carbon dioxide-containing gas rises, the cooling pipe disposed so as to penetrate the container 5 containing the carbon dioxide capturing material 8 and the wall member 9 of the container 5. 11 is divided into a plurality of parallel arrangements from an upstream portion to a downstream portion in the flow direction of the carbon dioxide-containing gas, and carbon dioxide is generated by a cooling medium flowing through the plurality of cooling pipes 11 arranged in parallel. It becomes possible to suppress the heat of the carbon dioxide capturing material 8 whose temperature gradually increases from the upstream portion to the downstream portion in the flow direction of the contained gas.

  That is, when carbon dioxide is captured from the carbon dioxide-containing gas, the temperature of the carbon dioxide capturing material 8 increases from the upstream portion of the carbon dioxide-containing gas flow to the downstream portion of the carbon dioxide-containing gas flow. The temperature distribution may exceed the desired value.

  Therefore, when the cooling pipe is installed vertically along the carbon dioxide-containing gas flow, the cooling medium flowing through the vertically installed cooling pipe even though the downstream portion of the carbon dioxide capturing material 8 is in a low temperature state. May transfer the heat obtained from the high temperature part of the carbon dioxide capturing material 8 to the low temperature part of the carbon dioxide capturing material 8 on the downstream side and heat it to a temperature exceeding the desired value.

Therefore, in the carbon dioxide recovery system according to the first reference example , the cooling pipe 11 disposed so as to penetrate the container 5 containing the carbon dioxide capturing material 8 and the wall member 9 of the container 5 has a flow direction of the carbon dioxide-containing gas. The carbon dioxide capturing material 8 located on the downstream side of the flow of the carbon dioxide-containing gas is arranged by being divided into a plurality of parts in parallel from the upstream portion to the downstream portion and flowing the cooling medium through these cooling pipes 11. It becomes possible to suppress the temperature rise.

According to the first reference example , when a solid carbon dioxide capturing material is used, the decrease in the amount of captured carbon dioxide due to the temperature increase of the capturing material and the container containing the capturing material is suppressed, thereby improving the efficiency of the carbon dioxide recovery system. The carbon dioxide recovery system which improves can be realized.

Next, a carbon dioxide recovery system according to a first embodiment of the present invention will be described with reference to FIG.

The carbon dioxide recovery system of this embodiment shown in FIG. 5 has the same basic configuration as the carbon dioxide recovery system of Reference Example 1 shown in FIGS. Differences will be described below.

  In the carbon dioxide recovery system of the present embodiment shown in FIG. 5, the cooling pipe 11 disposed so as to penetrate the container 5 containing the solid carbon dioxide capturing material 8 and the wall member 9 of the container 5 includes carbon dioxide. The plurality of cooling pipes 11 arranged in parallel are arranged in parallel from the upstream part to the downstream part in the flow direction of the contained gas, and the temperature of the cooling medium flowing through the cooling pipe 11 is set in the plurality of cooling pipes 11 arranged in parallel. A plurality of temperature detectors 17 to be detected and a plurality of flow rate adjusters 18 for adjusting the flow rate of the cooling medium flowing through the cooling pipe 11 are installed.

  Furthermore, based on the detected temperature of the cooling medium flowing through the cooling pipe 11 detected by the temperature detector 17, the temperature of the carbon dioxide capturing material 8 at an arbitrary position from the upstream portion to the downstream portion in the flow direction of the carbon dioxide-containing gas is desired. In order to adjust the flow rate to the respective temperatures, a control device 19 for calculating and outputting a command signal for adjusting the flow rate of the cooling medium flowing through the cooling pipe 11 is installed in the flow rate regulator 18.

  In the carbon dioxide recovery system of the present embodiment described above, the carbon dioxide capture material 8 is transformed from carbon dioxide-containing gas to carbon dioxide as shown on the right side of FIG. When the temperature of a part of the carbon dioxide capturing material 8 rises when capturing carbon dioxide, the temperature of the carbon dioxide capturing material 8 increases at a position intermediate between the upstream portion and the downstream portion of the flow of the carbon dioxide-containing gas. There is a high possibility that the temperature distribution is as shown by the broken line, which is the high temperature part.

  Therefore, the control device 19 controls the flow rate of the cooling medium flowing through the cooling pipes 11 arranged in parallel so as to pass through the container 5 containing the solid carbon dioxide capturing material 8 and the wall member 9 of the container. Then, the carbon dioxide capturing material 8 accommodated in the container 5 is cooled, and the temperature distribution of the carbon dioxide capturing material 8 is adjusted to a desired temperature distribution.

  A plurality of the cooling pipes 11 serving as heat transfer tubes are arranged in parallel from the upstream portion to the downstream portion in the flow direction of the carbon dioxide-containing gas. When the carbon dioxide-containing gas flows into the container 5 and the temperature of the carbon dioxide capturing material 8 rises, the temperature detector 17 installed in each of the plurality of cooling pipes 11 is located at a position near the cooling pipe 11. The temperature of the carbon dioxide capturing material 8 is detected and input to the control device 19.

  The control device 19 compares the detected temperature detected by the temperature detector 17 with a set value in which the desired temperature of the carbon dioxide capturing material 8 at the position is set, so that the cooling pipe is used to obtain the desired temperature. 11 calculates a flow rate of the cooling medium to be supplied to 11, outputs a command signal for adjusting the flow rate of the cooling medium flowing through the cooling pipe 11 to the flow rate adjuster 18, operates the flow rate adjuster 18, and operates the carbon dioxide trap 8 The temperature distribution of the carbon dioxide capturing material 8 is adjusted by adjusting the flow rate of the cooling medium flowing through the cooling pipe 11 in the vicinity of the arbitrary position, and the relationship between the position and temperature of the carbon dioxide capturing material is shown on the right side of FIG. As indicated by the solid line as the final temperature distribution, the temperature of the carbon dioxide capturing material 8 is as shown by the solid line without the high temperature part from the upstream part of the carbon dioxide containing gas flow to the downstream part of the carbon dioxide containing gas flow. Almost uniform Controlled to have a degree distribution.

  The method for detecting the temperature rise of the carbon dioxide capturing material 8 may be an empirical prediction means by a test operation or a temperature prediction means by a thermal fluid simulation in addition to the installation of the temperature detector 17.

  By performing the control as described above, only the flow rate of the cooling medium flowing down the cooling pipe 11 disposed in the vicinity of the position of the high temperature portion generated in the carbon dioxide capturing material 8 is increased, and the carbon dioxide capturing is performed. The temperature of the material 8 can be adjusted to a substantially uniform temperature distribution, and as a result, the total flow rate of the cooling medium supplied to the cooling pipe 11 necessary for adjusting the temperature of the carbon dioxide capturing material 8 can be reduced.

  As described above, in the carbon dioxide recovery system of the present embodiment, the flow rate of the cooling medium flowing through the plurality of cooling pipes 11 arranged in parallel from the upstream portion to the downstream portion in the flow direction of the carbon dioxide-containing gas is adjusted. As a result, the carbon dioxide capturing material 8 can be efficiently cooled to make the temperature of the carbon dioxide capturing material 8 substantially uniform.

  According to the present embodiment, when a solid carbon dioxide capturing material is used, the decrease in the amount of captured carbon dioxide due to the temperature rise in the container containing the capturing material and the capturing material is suppressed, thereby improving the efficiency of the carbon dioxide recovery system. An improved carbon dioxide recovery system can be realized.

Next, a carbon dioxide recovery system according to a second embodiment of the present invention will be described with reference to FIG.

Since the basic configuration of the carbon dioxide recovery system of this embodiment is the same as that of the carbon dioxide recovery system of the first embodiment shown in FIG. Explained.

  The carbon dioxide recovery system of the present embodiment shown in FIG. 6 includes a container 5a through which carbon dioxide-containing gas flows and a container 5b through which water vapor gas flows as containers for storing the carbon dioxide capturing material.

  That is, a container 5a enclosing a carbon dioxide capturing material 8a in which a carbon dioxide-containing gas flows and in the process of capturing carbon dioxide, and a container enclosing a carbon dioxide capturing material 8b in the process of rising and desorbing carbon dioxide by flowing of water vapor gas 5b, and penetrates the inside of the containers 5a and 5b and the wall members 9a and 9b of these containers 5a and 5b. The structure connected with the cooling piping 11 to flow down is provided, and sectional drawing which cut | disconnected the containers 5a and 5b in parallel with respect to the distribution direction of a carbon dioxide containing gas and water vapor | steam gas is shown.

The carbon dioxide recovery system of the present embodiment shown in FIG. 6 is similar to the carbon dioxide recovery system of the first embodiment shown in FIG. A detector 17 and a flow rate adjuster 18 are respectively installed, and a control device for adjusting the flow rate of the cooling medium flowing down the cooling pipe 11 by operating the flow rate adjuster 18 based on the detected temperature detected by the temperature detector 17. 19 is installed.

  In the carbon dioxide recovery system of the present embodiment, when the temperature of a part of the carbon dioxide capture material 8a accommodated in the container 5a in the carbon dioxide capture process in which the carbon dioxide-containing gas flows is increased, the carbon dioxide capture material 8a is Capture the carbon dioxide by adjusting the flow rate of the cooling medium flowing down through the common cooling pipes 11 arranged in parallel so as to pass through the container 5a and the wall member 9a of the container, by adjusting by the control device 19 The temperature distribution of the material 8a is controlled.

  Then, the heat obtained by the cooling medium flowing through the commonly arranged cooling pipe 11 by the trapping reaction heat in the carbon dioxide trapping material 8a is accommodated in the container 5b in the carbon dioxide temperature rising and desorption process in which the steam gas flows. The carbon dioxide capturing material 8b is heated and heated by being moved by a cooling medium flowing down through a common cooling pipe 11 arranged in parallel to the carbon dioxide capturing material 8b.

  The carbon dioxide capturing material 8b accommodated in the container 5b in the temperature rising and desorption process in which the water vapor gas flows is heated by the cooling medium that has obtained heat flowing down the common cooling pipe 11, and the gas flow in the container 5b. Carbon dioxide can be quickly desorbed from the carbon dioxide capturing material 8b by the water vapor gas flowing from the inlet.

In addition, the carbon dioxide capture | acquisition material 8a accommodated in the container 5a in which the carbon dioxide containing gas flows and is in the carbon dioxide capture process, and the carbon dioxide accommodated in the container 5b in the carbon dioxide temperature rising desorption process by flowing the steam gas The control of the temperature distribution of each of the trapping materials 8b is the same as in the case of the carbon dioxide recovery system of the first embodiment shown in FIG. 5, and is installed in a common cooling pipe 11 arranged in parallel. Since the control device 19 operates the flow rate regulator 18 based on the detected temperature detected by the temperature detector 17 to adjust the flow rate of the cooling medium flowing down the cooling pipe 11, these are controlled. The description about is omitted.

  As described above, the carbon dioxide scavenging material 8b accommodated in the container 5b that is in the process of heating and desorbing carbon dioxide and needs to be heated is generated in the carbon dioxide scavenging material 8a accommodated in the container 5a in the carbon dioxide capturing process. Since the carbon dioxide capture reaction heat can be used for heating through the cooling medium, the carbon dioxide capture reaction heat can be effectively recovered.

According to the present embodiment, when a solid carbon dioxide capturing material is used, the decrease in the amount of captured carbon dioxide due to the temperature rise in the container containing the capturing material and the capturing material is suppressed, thereby improving the efficiency of the carbon dioxide recovery system. An improved carbon dioxide recovery system can be realized.
[ Reference Example 2 ]

Next, a carbon dioxide recovery system that is a reference example 2 of the present invention will be described with reference to FIG.

Since the basic configuration of the carbon dioxide recovery system of Reference Example 2 shown in FIG. 7 is the same as that of the carbon dioxide recovery system of Reference Example 1 shown in FIGS. 1 to 4, description common to both is omitted. Differences will be described below.

In the carbon dioxide recovery system of the present Reference Example 2 shown in FIG. 7, the carbon dioxide-containing gas flow path 1 is located at the upstream side of the opening / closing valve 4a of the carbon dioxide-containing gas flow path 1 that is the previous stage of the carbon dioxide recovery system. It is the system provided with the cooling means 26 which cools the carbon dioxide containing gas which flows through.

In the carbon dioxide recovery system of this reference example 2, the carbon dioxide containing gas supplied to the container 5 containing the solid carbon dioxide capturing material 8 is cooled by the cooling means 26 so that the carbon dioxide content of the carbon dioxide containing gas is reduced. When it is high, the amount of gas to be cooled other than carbon dioxide can be reduced, which is particularly efficient.

  In general, for the carbon dioxide capturing material 8 having a small activation energy for the carbon dioxide capturing reaction to the solid carbon dioxide capturing material 8, the carbon dioxide is captured more at a lower temperature. Accordingly, it is possible to reduce the capacity of the solid carbon dioxide capturing material 8 included in the container 5 as compared with the case where the carbon dioxide-containing gas is not cooled in the previous stage of the carbon dioxide recovery system, and the carbon dioxide capturing material 8 It is also possible to suppress the temperature rise.

According to the present Reference Example 2 , when a solid carbon dioxide capturing material is used, the decrease in the amount of captured carbon dioxide due to the temperature increase of the capturing material and the container containing the capturing material is suppressed, thereby improving the efficiency of the carbon dioxide recovery system. The carbon dioxide recovery system which improves can be realized.

  The present invention can be applied to a carbon dioxide recovery system that captures and separates and recovers carbon dioxide from exhaust gas containing carbon dioxide.

  1: Carbon dioxide containing gas flow path, 2: High purity carbon dioxide gas flow path, 3: Water vapor gas flow path, 4a, 4b, 4c, 35, 36: Open / close valve, 5, 5a, 5b: Container, 6: Dioxide Carbon removal gas flow path, 7: Carbon dioxide recovery flow path, 8, 8a, 8b: Carbon dioxide capture material, 9: Wall member of container, 10, 11: Cooling piping, 17: Temperature detector, 18: Flow rate regulator , 19: control device, 26: cooling means.

Claims (8)

In a carbon dioxide recovery system for capturing and separating carbon dioxide from a carbon dioxide-containing gas containing carbon dioxide using a solid carbon dioxide capturing material,
A cooling pipe serving as a first cooling means for flowing down a cooling medium for cooling the trapping material is disposed inside the container for storing the solid trapping material and a wall member forming the container, and the cooling pipe is cooled. Configured to suppress an increase in temperature of the trapping material accommodated in the container by circulating a medium;
The cooling pipes constituting the first cooling means respectively disposed inside the wall member of the container for storing the solid capturing material are a plurality of horizontal pipes arranged in parallel, a plurality of vertical pipes, Consisting of
The carbon dioxide recovery system, wherein each of the plurality of horizontal pipes includes a flow rate adjusting means. In a carbon dioxide recovery system for capturing and separating carbon dioxide from a carbon dioxide-containing gas containing carbon dioxide using a solid carbon dioxide capturing material,
A cooling pipe serving as a first cooling means for flowing down a cooling medium for cooling the trapping material is disposed inside the container for storing the solid trapping material and a wall member forming the container, and the cooling pipe is cooled. Configured to suppress an increase in temperature of the trapping material accommodated in the container by circulating a medium;
A plurality of containers for storing the solid capturing material are provided, a first container in which carbon dioxide-containing gas flows in the capturing material and a second container in which water vapor gas flows in the capturing material. The cooling pipes constituting the first cooling means arranged inside the wall member of each container are provided with a plurality of horizontal pipes arranged in parallel, and the plurality of horizontal pipes were provided. The cooling pipe is arranged as a common cooling pipe across the first container and the second container,
The carbon dioxide recovery system, wherein each of the plurality of horizontal pipes includes a flow rate adjusting means. In a carbon dioxide recovery system for capturing and separating carbon dioxide from a carbon dioxide-containing gas containing carbon dioxide using a solid carbon dioxide capturing material,
A container for storing a solid capturing material, and a cooling pipe serving as a first cooling means for flowing down a cooling medium for cooling the capturing material in a wall member forming the container, and the wall member of the container A second cooling means for cooling the cooling medium is disposed upstream of the flow path for supplying the cooling medium to the first cooling means disposed in the interior of the trapping material. Configured to suppress the rise in temperature,
The cooling pipes constituting the first cooling means respectively disposed inside the wall member of the container for storing the solid capturing material are a plurality of horizontal pipes arranged in parallel, a plurality of vertical pipes, Consisting of
The carbon dioxide recovery system, wherein each of the plurality of horizontal pipes includes a flow rate adjusting means. In a carbon dioxide recovery system for capturing and separating carbon dioxide from a carbon dioxide-containing gas containing carbon dioxide using a solid carbon dioxide capturing material,
A container for storing a solid capturing material, and a cooling pipe serving as a first cooling means for flowing down a cooling medium for cooling the capturing material in a wall member forming the container, and the wall member of the container A second cooling means for cooling the cooling medium is disposed upstream of the flow path for supplying the cooling medium to the first cooling means disposed in the interior of the trapping material. Configured to suppress the rise in temperature,
A plurality of containers for storing the solid capturing material are provided, a first container in which carbon dioxide-containing gas flows in the capturing material and a second container in which water vapor gas flows in the capturing material. The cooling pipes constituting the first cooling means arranged inside the wall member of each container are provided with a plurality of horizontal pipes arranged in parallel, and the plurality of horizontal pipes were provided. The cooling pipe is arranged as a common cooling pipe across the first container and the second container,
The carbon dioxide recovery system, wherein each of the plurality of horizontal pipes includes a flow rate adjusting means. In the carbon dioxide recovery system according to any one of claims 1 to 4,
Installed in each of a plurality of horizontal pipes arranged in parallel to constitute the first cooling means arranged in the wall member of the container containing the solid capturing material, A temperature detector for detecting the temperature of the cooling medium flowing through the flow pipe, a flow rate regulator for adjusting the flow rate of the cooling medium flowing through the horizontal pipe, and a detected value of the temperature of the cooling medium detected by the temperature detector Control for calculating the temperature distribution in the container and outputting a command signal for adjusting the flow rate of the cooling medium to the flow rate regulator so that the calculated temperature distribution becomes a set desired temperature distribution state A carbon dioxide recovery system comprising an apparatus. In the carbon dioxide recovery system according to claim 2 or 4 ,
Heat obtained from a carbon dioxide-containing gas flowing through the carbon dioxide capturing material housed in the first container by a cooling medium flowing through a common cooling pipe constituting the first cooling means disposed in the first container The carbon dioxide is used for heating the carbon dioxide capturing material in which the water vapor gas stored in the second container flows through the cooling medium flowing through the common cooling pipe by heat exchange. Collection system. In the carbon dioxide recovery system according to any one of claims 1 to 4,
The carbon dioxide-containing gas supplied to the solid capturing material accommodated in the container is a carbon dioxide-containing gas having a temperature of 0 ° C. or higher and 80 ° C. or lower. In the carbon dioxide recovery system according to any one of claims 1 to 4,
The carbon dioxide containing system supplied to the solid capturing material accommodated in the container is an exhaust gas discharged from an iron mill or a thermal power plant.

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