Carbon dioxide capture device

Abstract

To provide a carbon dioxide recovery device which can use adsorption heat, and has high energy efficiency enough to suppress energy required for rise of a temperature of an adsorption material in a desorption step.SOLUTION: A carbon dioxide recovery device 1 includes: a module 11 which has an adsorption material 12 therein, and executes an adsorption step of sucking gas containing carbon dioxide, and making the adsorption material 12 adsorb the carbon dioxide, and a desorption step of heating the periphery of the adsorption material in a decompressed state, and thereby desorbing the carbon dioxide from the adsorption material 12; and a cooling water tank 82 for storing a cooling medium for cooling the module 11, wherein in the adsorption step, when a difference between the temperature of the adsorption material 12 and the temperature of a cooling medium in the cooling water tank 82 is equal to or more than a first threshold, the adsorption step flows the cooling medium to the module 11, and recovers the heat.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a carbon dioxide recovery device.

Background Art

[0002] Conventionally, a technique for recovering carbon dioxide from a gas containing carbon dioxide such as air has been known. For example, Patent Document 1 describes this type of technique. Patent Document 1 describes a method of separating gaseous carbon dioxide from a gas mixture by cyclic adsorption / desorption using an adsorbent that adsorbs gaseous carbon dioxide.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the desorption step of desorbing carbon dioxide adsorbed on the adsorbent from the adsorbent, it is necessary to heat the adsorbent to a high temperature. To raise the temperature of the adsorbent from room temperature to a desorption-capable temperature, a large amount of heat energy is required from the outside. On the other hand, in the adsorption step of adsorbing carbon dioxide on the adsorbent, adsorption heat is generated in the adsorbent, but this adsorption heat has not been utilized. There has been room for improvement in the prior art in terms of improving the energy efficiency required for heating the adsorbent.

[0005] An object of the present invention is to provide a highly energy-efficient carbon dioxide recovery device that can utilize adsorption heat and suppress the energy required to raise the temperature of the adsorbent in the desorption step.

Means for Solving the Problems

[0006] This disclosure solves the aforementioned problems by the following solutions. For ease of understanding, the embodiments of this disclosure will be described using corresponding reference numerals, but are not limited thereto.

[0007] The first disclosure is a carbon dioxide recovery device (1) comprising: a module (11) having an adsorbent (12) inside, which performs an adsorption step of drawing a gas containing carbon dioxide onto the adsorbent (12) to adsorb the carbon dioxide, and a desorption step of heating the adsorbent (12) while the surrounding area is under reduced pressure to desorb the carbon dioxide; and a tank (82) for storing a cooling medium to cool the module (11), wherein in the adsorption step, when the difference between the temperature of the adsorbent (12) and the temperature of the cooling medium in the tank (82) is greater than or equal to a first threshold, the cooling medium is flowed into the module (11) to recover heat.

[0008] The second disclosure is a carbon dioxide recovery device (1) described in the first disclosure, wherein when the difference between the inlet temperature at the position where the cooling medium enters the module (11) and the outlet temperature at the position where the cooling medium exits the module (11) becomes smaller than a second threshold, the flow of the cooling medium to the module (11) is stopped.

[0009] The third disclosure is a carbon dioxide recovery device (1) described in the first or second disclosure, wherein when the difference between the temperature of the adsorbent (12) and the temperature of the cooling medium in the tank (82) becomes smaller than a third threshold, the flow of the cooling medium to the module (11) is stopped. [Effects of the Invention]

[0010] According to this disclosure, it is possible to provide an energy-efficient carbon dioxide recovery device that can utilize the heat of adsorption, thereby suppressing the energy required to raise the temperature of the adsorbent in the desorption process. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic diagram showing the configuration of the liquid flow in a carbon dioxide recovery device 1 according to one embodiment of the present invention. [Figure 2] This is a schematic diagram showing the gas flow configuration of module 11 of the carbon dioxide capture device 1 of this embodiment. [Figure 3] This is a schematic diagram showing the heat supply path during the adsorption process when heat recovery from adsorption is not being performed. [Figure 4] This is a schematic diagram showing the heat supply path during heat recovery in the adsorption process. [Figure 5] This graph illustrates the heat transfer in module 11 during the adsorption process, including periods when adsorption heat is not being recovered and periods when adsorption heat is being recovered. [Figure 6] This flowchart shows an example of the operation flow for adsorption heat recovery using the carbon dioxide recovery device of this embodiment. [Modes for carrying out the invention]

[0012] Embodiments of the present invention will be described below with reference to the drawings.

[0013] <Overall Structure> Figure 1 is a schematic diagram showing the configuration of the liquid flow in a carbon dioxide recovery device 1 according to one embodiment of the present invention. Figure 2 is a schematic diagram showing the configuration of the gas flow in module 11 of the carbon dioxide recovery device 1 according to this embodiment. Note that the gas flow configuration of the carbon dioxide recovery device 1 is not shown in Figure 1.

[0014] The carbon dioxide capture device 1 of this embodiment is applied, for example, to direct air capture (DAC) technology, which captures carbon dioxide from the atmosphere in order to reduce the concentration of carbon dioxide in the atmosphere. The carbon dioxide captured by the carbon dioxide capture device 1 is stored underground or reused as fuel or material.

[0015] As shown in FIGS. 1 and 2, the carbon dioxide recovery apparatus 1 of the present embodiment includes a module unit 10, a fan 61, a vacuum pump 62, a carbon dioxide recovery pump 63, a heat exchanger 80, and a control device 90.

[0016] The module unit 10 is configured by arranging a plurality of modules 11 that adsorb carbon dioxide in parallel. In the present embodiment, a total of 16 modules 11 are arranged by a pair of left and right module units 10.

[0017] As shown in FIG. 2, the module 11 is a carbon dioxide recovery module including an adsorbent 12, a first valve 21, a second valve 22, a third valve 23, a fourth valve 24, and an adsorbent temperature sensor 27.

[0018] The adsorbent 12 is arranged inside the module 11 to adsorb carbon dioxide. The adsorbent 12 is a particulate member, and has the property of adsorbing carbon dioxide in a low temperature state (for example, in the range of -30°C to 50°C) and desorbing (releasing) carbon dioxide in a high temperature state (for example, in the range of 50°C to 110°C) and a state where the concentration of ambient carbon dioxide is low. Examples of such an adsorbent 12 include a solid amine carbon dioxide adsorbent formed by supporting an amine on a porous material such as silica.

[0019] The first valve 21 is an on-off valve arranged at the connection part between the carbon dioxide line 103 for recovering carbon dioxide and the module 11. A carbon dioxide recovery pump 63 is arranged in the carbon dioxide line 103. The second valve 22 is an on-off valve arranged at the connection part between the vacuum line 102 where the vacuum pump 62 is arranged and the module 11. The third valve 23 is an on-off valve arranged at the inlet for taking in air or the like into the module 11. The fourth valve 24 is an on-off valve arranged at the connection part between the adsorption line 101 and the module 11. A fan 61 is arranged in the adsorption line 101.

[0020] The first valve 21, the second valve 22, the third valve 23, and the fourth valve 24 are all controlled to open and close by the control device 90. The first valve 21, the second valve 22, the third valve 23, and the fourth valve 24 are each constituted by, for example, a normally open butterfly valve. The adsorbent temperature sensor 27 measures the temperature of the adsorbent 12. The measurement information of the adsorbent temperature sensor 27 is transmitted to the control device 90.

[0021] The adsorption line 101 is branched and connected to each of the modules 11. The fan 61 is disposed at a portion where the branched portions of the adsorption line 101 converge. When the fan 61 is driven, it generates a gas flow from "intake" to "exhaust" with respect to the module 11 through the adsorption line 101. Thereby, the atmosphere is supplied into the module 11.

[0022] The vacuum line 102 is branched and connected to each of the modules 11. The vacuum pump 62 is disposed at a portion where the branched portions of the vacuum line 102 converge. When the vacuum pump 62 is driven, it sucks the gas inside the module 11 through the vacuum line 102 and makes the inside of the module 11 into a vacuum state or approach a vacuum state.

[0023] The carbon dioxide line 103 is branched and connected to each of the modules 11. A carbon dioxide recovery pump 63 is disposed at a portion where the branched portions of the carbon dioxide line 103 converge. The carbon dioxide recovery pump 63 applies a suction force to the carbon dioxide flowing through the carbon dioxide line 103 and stores the recovered carbon dioxide in a tank (not shown) for storing carbon dioxide.

[0024] Returning to FIG. 1, the heat exchange device 80 will be described. The heat exchange device 80 supplies thermal energy for heating the inside of the module 11 to a predetermined temperature when each module 11 of the module unit 10 performs a desorption process. Further, the heat exchange device 80 recovers unnecessary thermal energy when each module 11 performs an adsorption process.

[0025] The heat exchange device 80 of this embodiment includes a heat exchanger 81, a chilled water tank 82, a chilled water line 111, a hot water tank 83, a hot water line 112, and a three-way valve 30.

[0026] The heat exchanger 81 performs heat exchange between the heat transfer medium flowing through the chilled water line 111 and the heat transfer medium flowing through the hot water line 112. The heat exchanger 81 is, for example, a heat pump. The heat transfer medium is, for example, a liquid such as water. The heat transfer that occurs in the heat exchanger 81 cools the heat transfer medium flowing through the chilled water line 111 and heats the heat transfer medium flowing through the hot water line 112.

[0027] The chilled water tank 82 stores the heat transfer medium that flows through the chilled water line 111. After being stored in the chilled water tank 82, the heat transfer medium flowing through the chilled water line 111 is sent to the heat exchanger 81. The heat transfer medium cooled in the heat exchanger 81 is returned to the chilled water tank 82 and then sent to each module 11 through the chilled water line 111. A heat exchanger circulation water pump 821 is positioned between the chilled water tank 82 and the heat exchanger 81 in the chilled water line 111. The heat exchanger circulation water pump 821 is driven to circulate the heat transfer medium flowing through the chilled water line 111 between the chilled water tank 82 and the heat exchanger 81.

[0028] The chilled water line 111 branches and connects to the upstream and downstream sides of each module 11, connecting the chilled water tank 82 to each module 11. Between the chilled water tank 82 and each module 11 in the chilled water line 111, a first chilled water circulation water pump 822 and a second chilled water circulation water pump 823 are positioned. Furthermore, a circulation line 824 is positioned in the chilled water line 111, returning the water from the downstream side of the second chilled water circulation water pump 823 to the upstream side. A circulation valve 825 is positioned in this circulation line 824.

[0029] The hot water tank 83 stores the heat transfer medium that flows through the hot water line 112. After being stored in the hot water tank 83, the heat transfer medium flowing through the hot water line 112 is sent to the heat exchanger 81. The heat transfer medium heated in the heat exchanger 81 is returned to the hot water tank 83 and then sent to each module 11 through the hot water line 112. A heat exchanger circulation water pump 831 is positioned between the hot water tank 83 and the heat exchanger 81 in the hot water line 112. The heat exchanger circulation water pump 831 is driven to circulate the heat transfer medium flowing through the hot water line 112 between the hot water tank 83 and the heat exchanger 81.

[0030] The hot water line 112 branches and connects to the upstream and downstream sides of each module 11, connecting the hot water tank 83 to each module 11. Between the hot water tank 83 and each module 11 in the hot water line 112, a first hot water circulation water pump 832 and a second hot water circulation water pump 833 are positioned. Furthermore, a circulation line 834 is positioned in the hot water line 112, returning water from the downstream side of the second hot water circulation water pump 833 to the upstream side. A circulation valve 835 is positioned in this circulation line 834.

[0031] The three-way valve 30 is connected to the chilled water line 111, the hot water line 112, and the module 11. The three-way valve 30 is positioned on both the upstream and downstream sides of the module 11. The three-way valve 30 is configured to be switchable between a chilled water connection state, connecting the chilled water line 111 to the module 11; a hot water connection state, connecting the hot water line 112 to the module 11; and a disconnection state, disconnecting the chilled water line 111 and the hot water line 112 from the module 11.

[0032] The flow path switching of the three-way valve 30 is controlled by the control device 90. A heat transfer medium is introduced into module 11 through the three-way valve 30 located on the upstream side, and the heat transfer medium is returned to the heat exchanger 81 side through the three-way valve 30 located on the downstream side.

[0033] Next, the control device 90 will be described. The control device 90 controls the operation of each part of the carbon dioxide recovery device 1. The control device 90 controls the operation of devices used for carbon dioxide adsorption and desorption, such as driving and stopping. The control device 90 controls the opening and closing of the first valve 21, second valve 22, third valve 23, and fourth valve 24 provided in each module 11. In addition, the control device 90 controls the driving of the fan 61, vacuum pump 62, carbon dioxide recovery pump 63, heat exchanger circulation water pump 821, first chilled water circulation water pump 822, second chilled water circulation water pump 823, heat exchanger circulation water pump 831, first hot water circulation water pump 832, second hot water circulation water pump 833, etc., and controls the opening and closing of the circulation valve 825 and circulation valve 835.

[0034] The control device 90 is, for example, a computer having a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), etc. The control device 90 may consist of one unit or multiple units.

[0035] <Carbon dioxide capture> Next, the control for carbon dioxide recovery by the control device 90 will be described. The carbon dioxide recovery device 1 alternately performs an adsorption process in which carbon dioxide from a gas such as the inhaled atmosphere is adsorbed onto the adsorbent material 12 in the module 11, and a desorption process in which the carbon dioxide adsorbed onto the adsorbent material 12 is desorbed. The desorbed carbon dioxide is compressed and stored in a tank (not shown), thereby removing and recovering carbon dioxide from the air. In this embodiment, the adsorption process and the desorption process are performed in a ratio of 3:1 between the time of the adsorption process and the time of the desorption process.

[0036] The adsorption process involves adsorbing carbon dioxide onto the adsorbent material 12 within module 11. During the adsorption process, the third valve 23 and fourth valve 24 of module 11 are opened, and the first valve 21 and second valve 22 are closed. A fan 61 is driven, generating a gas flow from upstream to downstream, drawing in a gas containing carbon dioxide (e.g., air) through the third valve 23. The drawn-in gas passes through the adsorbent material 12 within module 11. At this time, the temperature inside module 11 is ambient (25°C), and the carbon dioxide in the gas is adsorbed onto the adsorbent material 12. Other gases, such as nitrogen and oxygen, are exhausted to the outside of the carbon dioxide recovery device 1 through the fourth valve 24 and the adsorption line 101. In this embodiment, if certain conditions are met during this adsorption process, an adsorption heat recovery operation is performed. This adsorption heat recovery operation will be described later.

[0037] The desorption process is a process of desorbing carbon dioxide from the adsorbent 12 inside the module 11. In the desorption process, the first valve 21, third valve 23, and fourth valve 24 of the module 11 are closed, and the second valve 22 is opened. The vacuum pump 62 is operated to draw air into the inside of the module 11, reducing the pressure to a vacuum state or close to a vacuum state. At the same time, the heat exchanger 80 supplies thermal energy by having a heat transfer medium, which acts as a heat source, flow inside the module 11, raising the temperature of the adsorbent 12 inside the module 11.

[0038] By controlling the temperature rise of the adsorbent 12, the adsorbent 12 is heated to a predetermined temperature (e.g., 80°C) sufficient for the desorption process, and the carbon dioxide adsorbed on the adsorbent 12 is desorbed. Next, the second valve 22, the third valve 23, and the fourth valve 24 are closed, the first valve 21 is opened, and the carbon dioxide recovery pump 63 is driven, and the carbon dioxide desorbed through the carbon dioxide line 103 is stored in a tank (not shown). In this embodiment, of the 16 modules 11, 12 are controlled to perform the adsorption process, and the remaining 4 are controlled to perform the desorption process.

[0039] <Adsorption heat recovery operation (control)> In the adsorption process, when carbon dioxide is adsorbed onto the adsorbent 12, heat of adsorption is generated. This heat of adsorption has not been utilized in conventional carbon dioxide recovery devices. However, if this heat of adsorption can be used to raise the temperature of the adsorbent 12 for the desorption process, the energy required to raise the temperature of the adsorbent 12 can be reduced. Therefore, the carbon dioxide recovery device 1 of this embodiment performs a heat of adsorption recovery operation. This heat of adsorption recovery operation will be described below.

[0040] Figure 3 is a schematic diagram showing the heat supply path during the adsorption process when adsorption heat is not recovered. Figure 4 is a schematic diagram showing the heat supply path during the adsorption process when adsorption heat is recovered. Figure 5 is a graph illustrating the heat transfer in module 11, including the periods when adsorption heat is not recovered and when adsorption heat is recovered. Note that the remaining modules 11 are not shown in Figures 3 to 5.

[0041] First, the structure for supplying the heat transfer medium to module 11 will be described. As shown in Figures 3 and 4, module 11 includes an inlet-side flow path 33 connected to an inlet into which the heat transfer medium flows, and an outlet-side flow path 34 connected to an outlet out which the heat transfer medium flows out. A three-way valve 30 is positioned at the upstream end of the inlet-side flow path 33, and another three-way valve 30 is positioned at the downstream end of the outlet-side flow path 34.

[0042] An inlet temperature sensor 35 is provided in the inlet channel 33. The inlet temperature sensor 35 measures the temperature of the heat transfer medium flowing into the module 11 (hereinafter also referred to as the inlet temperature), and transmits the measurement information to the control device 90. An outlet temperature sensor 36 is provided in the outlet channel 34. The outlet temperature sensor 36 measures the temperature of the heat transfer medium flowing out of the module 11 (hereinafter also referred to as the outlet temperature), and transmits the measurement information to the control device 90. In addition, the carbon dioxide recovery device 1 of this embodiment is equipped with a hot water tank temperature sensor 37 and a chilled water tank temperature sensor 38. The hot water tank temperature sensor 37 measures the temperature of the hot water tank 83, and transmits the measurement information to the control device 90. The chilled water tank temperature sensor 38 measures the temperature of the chilled water tank 82, and transmits the measurement information to the control device 90.

[0043] The operation during the non-recovery of adsorption heat in the adsorption process will now be explained. Figure 3 shows the state during the non-recovery of adsorption heat in the adsorption process. In the state during the non-recovery of adsorption heat in the adsorption process, the module 11 has already been cooled to a predetermined temperature (for example, 20°C) by the chilled water line 111 in the preceding stage. Therefore, the control device 90 controls the inlet three-way valve 30a and the outlet three-way valve 30b to isolate the module 11 from both the chilled water line 111 and the hot water line 112. In this state, carbon dioxide is adsorbed from the atmosphere introduced by the drive of the fan 61.

[0044] As shown in Figure 5, when the adsorption process begins, heat is generated due to adsorption, causing the temperature of the adsorbent 12 in the module 11 to gradually rise. When the temperature difference ΔT1 between the temperature of the chilled water tank 82 obtained from the chilled water tank temperature sensor 38 and the temperature of the adsorbent 12 obtained from the adsorbent temperature sensor 27 exceeds a predetermined value (first threshold), the control device 90 controls the inlet three-way valve 30a to connect the chilled water line 111 to the inlet side flow path 33, and controls the outlet three-way valve 30b to connect the outlet side flow path 34 to the chilled water line 111, thereby starting adsorption heat recovery (state shown in Figure 4). Here, the first threshold can be set as appropriate, but for example, it can be set to 5°C. Even during this adsorption heat recovery, the fan 61 continues to operate, and carbon dioxide adsorption continues.

[0045] When adsorption heat recovery is started, the heat transfer medium (chilled water) is heated by the heat of adsorption as it passes through module 11, and the heated chilled water returns to chilled water tank 82. This heated chilled water undergoes heat exchange in heat exchanger 81, and the recovered adsorption heat is used to heat the hot water. In the initial stages of adsorption heat recovery, the temperature difference between the inlet temperature measured by the inlet temperature sensor 35 and the outlet temperature measured by the outlet temperature sensor 36 (module inlet / outlet water temperature difference ΔT2) is large, but as heat recovery progresses, this module inlet / outlet water temperature difference gradually decreases. When this module inlet / outlet water temperature difference ΔT2 falls below a predetermined value (second threshold), the control device 90 controls the inlet three-way valve 30a and the outlet three-way valve 30b to isolate module 11 from both the chilled water line 111 and the hot water line 112 (state shown in Figure 3). Here, the second threshold can be set as appropriate, but for example, it can be set to 5°C. After a predetermined time has elapsed since the start of adsorption, the adsorption process is terminated.

[0046] Next, referring to Figure 6, the timing for switching between starting and ending adsorption heat recovery will be explained. Figure 6 is a flowchart showing an example of the operation flow of adsorption heat recovery by the carbon dioxide recovery device of this embodiment.

[0047] When the adsorption process begins, in step S10, the control device 90 determines whether a certain amount of time has elapsed since the start of the adsorption process. If a certain amount of time has elapsed since the start of the adsorption process, the control device 90 terminates the adsorption process (step S10: Yes). If a certain amount of time has not elapsed since the start of the adsorption process, the control device 90 proceeds to step S20 of the adsorption process (step S10: No).

[0048] In step S20, the control device 90 exposes the adsorbent 12 to outside air to adsorb carbon dioxide. During this adsorption process in step S20, as shown in Figure 5, the temperature of the adsorbent 12 gradually rises due to the heat of adsorption.

[0049] In step S30, the control device 90 determines whether or not heat recovery is in progress. If heat recovery is in progress, the control device 90 proceeds to step S90 of the adsorption process (step S30: Yes). If heat recovery is not in progress, the control device 90 proceeds to step S40 of the adsorption process (step S30: No).

[0050] In step S40, the control device 90 determines whether the temperature difference ΔT1 between the temperature of the chilled water tank 82 obtained from the chilled water tank temperature sensor 38 and the temperature of the adsorbent 12 obtained from the adsorbent temperature sensor 27 is greater than or equal to a predetermined value (first threshold). If ΔT1 is greater than or equal to the predetermined value (first threshold), the control device 90 proceeds to step S50 of the adsorption process (step S40: Yes). If ΔT1 is not greater than or equal to the predetermined value (first threshold), the control device 90 proceeds to step S70 of the adsorption process (step S40: No).

[0051] In step S50, the control device 90 makes a decision to perform adsorption heat recovery. In step S60, the control device 90 controls the inlet three-way valve 30a to connect the chilled water line 111 to the inlet side flow path 33, and controls the outlet three-way valve 30b to connect the outlet side flow path 34 to the chilled water line 111, thereby forming a chilled water flow for adsorption heat recovery.

[0052] In step S70, the control device 90 decides not to perform adsorption heat recovery. In step S80, the control device 90 controls the inlet three-way valve 30a and the outlet three-way valve 30b to a fully closed state, thereby isolating module 11 from both the chilled water line 111 and the hot water line 112.

[0053] In step S90, the control device 90 determines whether the temperature difference (module inlet / outlet water temperature difference ΔT2) between the inlet temperature measured by the inlet temperature sensor 35 and the outlet temperature measured by the outlet temperature sensor 36 is greater than or equal to a predetermined value (second threshold). If ΔT2 is greater than or equal to the predetermined value (second threshold), the control device 90 proceeds to step S50 of the adsorption process (step S90: Yes). If ΔT2 is not greater than or equal to the predetermined value (second threshold), the control device 90 proceeds to step S100 of the adsorption process (step S90: No).

[0054] In step S100, the control device 90 decides to terminate the adsorption heat recovery and proceeds to step S80 of the adsorption process.

[0055] In the example of the operation flow described above, in step S90, the control device 90 determines whether or not to terminate adsorption heat recovery by determining whether or not the module inlet / outlet water temperature difference ΔT2 is equal to or greater than a second threshold. However, the operation is not limited to this, and for example, adsorption heat recovery may be terminated (the flow of the cooling medium to the module is stopped) when the difference between the temperature of the adsorbent 12 and the temperature of the cooling medium in the chilled water tank 82 becomes smaller than a third threshold.

[0056] As described above, in the carbon dioxide recovery device 1 of this embodiment, when the difference between the temperature of the adsorbent 12 and the temperature of the cooling medium in the chilled water tank 82 is greater than or equal to a first threshold, the cooling medium is flowed to the module 11 to recover heat. This allows for the effective utilization of adsorption heat that was not previously used, and can supplement the amount of heat required for heat exchange in the heat exchanger 81. Therefore, it is possible to provide an energy-efficient carbon dioxide recovery device 1 that can suppress the energy required to raise the temperature of the adsorbent 12 in the desorption process.

[0057] Furthermore, the carbon dioxide capture device 1 stops flowing the cooling medium to module 11 when the difference between the inlet temperature at the point where the cooling medium enters module 11 and the outlet temperature at the point where the cooling medium exits module 11 falls below a second threshold. This ensures that the overall module cooling performance of the carbon dioxide capture device is maintained.

[0058] Furthermore, the carbon dioxide recovery device 1 may stop flowing the cooling medium to the module 11 when the difference between the temperature of the adsorbent 12 and the temperature of the cooling medium in the chilled water tank 82 falls below a third threshold. This maintains the overall module cooling performance of the carbon dioxide recovery device.

[0059] Although embodiments of the present invention have been described above, the invention is not limited to the embodiments and modifications described above. Furthermore, the effects described in the above embodiments are merely a list of preferred effects and are not limited to those described in the above embodiments. [Explanation of Symbols]

[0060] 1. Carbon dioxide capture device 11 modules 12 Adsorbent 30 Three-way valve 61 Fans 62 Vacuum pump 63. Carbon dioxide capture pump 80 Heat exchange equipment 81 Heat exchanger 82 Cold water tank 83 Hot water tank

Claims

1. A module having an adsorbent inside, which performs an adsorption step of drawing a gas containing carbon dioxide onto the adsorbent to adsorb the carbon dioxide, and a desorption step of heating the adsorbent while the area around it is under reduced pressure to desorb the carbon dioxide, A tank for storing a cooling medium for cooling the module, A heat exchanger that performs heat exchange between a heat transfer medium that raises the temperature of the module and a cooling medium, Equipped with, In the adsorption step, when the difference between the temperature of the adsorbent and the temperature of the cooling medium in the tank is greater than or equal to a first threshold, the cooling medium is flowed to the module to recover heat. The heat exchanger utilizes the heat recovered by the cooling medium to heat the heat medium, In the desorption step, the module is heated by the heat transfer medium heated by the heat exchanger. Carbon dioxide capture device.

2. In the carbon dioxide recovery apparatus according to claim 1, When the difference between the inlet temperature at the point where the cooling medium enters the module and the outlet temperature at the point where the cooling medium exits the module falls below a second threshold, the flow of the cooling medium to the module is stopped. Carbon dioxide capture device.

3. In the carbon dioxide recovery apparatus according to claim 1 or claim 2, When the difference between the temperature of the adsorbent and the temperature of the cooling medium in the tank becomes smaller than a third threshold, the flow of the cooling medium to the module is stopped. Carbon dioxide capture device.

Images