Co2 recovery apparatus

Abstract

To provide a CO2 recovery apparatus contributing to improvement of exhaust heat utilization efficiency.SOLUTION: A CO2 recovery apparatus (1) includes: a passage (2a) where gas is flown; a first CO2 adsorption member (5) and a heat absorbing member (6) disposed in the passage (2a); a first insertion port (2b) through which fluid is inserted in the passage (2a) to flow the fluid in the heat absorbing member (6) via the first CO2 adsorption member (5); and a second insertion port (2c) through which the fluid is inserted in the passage (2a) to flow the fluid in the first CO2 adsorption member (5) via the heat absorbing member (6). When the fluid is flow in the heat absorbing member (6) via the heated first CO2 adsorption member (5) to heat the heat adsorbing member (6) and the first CO2 adsorption member (5) is heated, the fluid is flown in the first CO2 adsorption member (5) via the heat absorbing member (6) to heat the first CO2 adsorption member (5).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a CO2 capture device. [Background technology]

[0002] CO2 capture devices that capture CO2 contained in gas using a CO2 adsorption member (i.e., a solid adsorption member) have been put to practical use. Such CO2 capture devices are configured to desorb and capture CO2 adsorbed by the CO2 adsorption member by heating the CO2 adsorption member.

[0003] For example, the CO2 recovery device of Patent Document 1 is configured to heat a CO2 adsorption member without contact using steam extracted from a steam turbine, and to desorb and recover CO2 adsorbed in the CO2 adsorption member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5914300 Summary of the Invention [Problem to be solved by the invention]

[0005] The present applicant has found the following problem: The CO2 recovery device of Patent Document 1 has a configuration in which the CO2 adsorption member is heated without contact, so heat is not easily transferred to the CO2 adsorption member, resulting in poor waste heat utilization efficiency.

[0006] The present disclosure has been made in consideration of such problems, and realizes a CO2 recovery device that contributes to improving the efficiency of exhaust heat utilization. [Means for solving the problem]

[0007] A CO2 recovery apparatus according to one embodiment of the present disclosure is a CO2 recovery apparatus that recovers CO2 contained in gas, a flow passage through which the gas flows to recover CO2; a first CO2 adsorption member disposed in the flow passage; a heat absorbing member disposed in the flow passage alongside the first CO2 adsorption member; a first insertion port provided in the flow passage for inserting the fluid into the flow passage so that the fluid flows to the heat absorbing member via the first CO2 adsorption member; a second insertion port provided in the flow passage for inserting the fluid into the flow passage so that the fluid flows to the first CO2 adsorption member via the heat absorbing member; Equipped with The fluid is passed through the heat absorption member via the first CO2 adsorption member, which has been heated to desorb CO2, to heat the heat absorption member, and when heating the first CO2 adsorption member, the fluid is passed through the heat absorption member to heat the first CO2 adsorption member. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to realize a CO2 recovery device that contributes to improving the efficiency of exhaust heat utilization. [Brief explanation of the drawings]

[0009] [Figure 1] 2(a) to 2(f) are diagrams for explaining the CO2 capture cycle in the CO2 capture device of the first embodiment. [Figure 2] 2 is a block diagram showing the configuration of a control system of the CO2 recovery apparatus of the first embodiment. FIG. [Figure 3] 10(a) to 10(h) are diagrams for explaining the CO2 capture cycle in the CO2 capture device of the second embodiment. [Figure 4] FIG. 10 is a block diagram showing the configuration of a control system of a CO2 recovery apparatus according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Specific embodiments to which the present disclosure is applied will be described in detail below with reference to the drawings. However, the present disclosure is not limited to the following embodiments. In addition, the following description and drawings have been simplified as appropriate for clarity of explanation.

[0011] <First Embodiment> 1(a) to 1(f) are diagrams for explaining the CO2 capture cycle in the CO2 capture device of this embodiment. FIG. 2 is a block diagram showing the configuration of the control system of the CO2 capture device of this embodiment. In the following explanation, for clarity, a three-dimensional (XYZ) coordinate system is used. Here, in FIGS. 1(a) to 1(f), the flows of gas and H2O are indicated by dashed lines.

[0012] As shown in Figures 1(a) to 1(f), the CO2 recovery device 1 of this embodiment is configured to recover CO2 contained in gas using a CO2 adsorption member, which is a so-called solid adsorption member. As shown in Figures 1(a) to 1(f) and 2, the CO2 recovery device 1 includes a circulation pipe 2, a pump 3, a tank 4, a CO2 adsorption member 5, a heat absorbing member 6, a heating / cooling unit 7, and a control unit 8.

[0013] 1(a) to 1(f), the flow pipe 2 has a flow passage 2a through which gas flows in order to recover CO2 from the gas. The flow pipe 2 extends, for example, in the Y-axis direction, and the end of the flow pipe 2 on the + side of the Y-axis and the end of the flow pipe 2 on the - side of the Y-axis are closed.

[0014] As shown in Figures 1(a) to 1(f), a first insertion port 2b is provided at the end of the flow pipe 2 on the negative side of the Y axis, through which gaseous H2O, a representative example of a fluid, is inserted into the flow passage 2a of the flow pipe 2. A second insertion port 2c is provided at the end of the flow pipe 2 on the positive side of the Y axis, through which gaseous H2O is inserted into the flow passage 2a of the flow pipe 2. These first insertion port 2b and second insertion port 2c are connected to an H2O supply unit 10 (see Figure 2).

[0015] As shown in Figures 1(a) to 1(f), a third insertion port 2d for introducing gas is provided at the end of the flow pipe 2 on the negative side of the Y axis and on the positive side of the Z axis. The third insertion port 2d can be opened and closed by a first valve 11. At this time, it is preferable to send gas into the third insertion port 2d using, for example, a fan 12. The gas may be air taken in from the atmosphere or exhaust gas from a combustion mechanism.

[0016] 1(a) to 1(f), a first outlet 2e for discharging gas is provided at approximately the center in the Y-axis direction and at the end on the negative Z-axis side of the flow pipe 2. The first outlet 2e can be opened and closed by a second valve 13.

[0017] 1(a) to 1(f), a second outlet 2f for discharging gas is provided at the Y-axis negative side of the flow pipe 2 and at the Z-axis negative end of the flow pipe 2. The second outlet 2f can be opened and closed by a third valve 14.

[0018] 1(a) to 1(f), a third outlet 2g for discharging gas is provided at the end of the flow pipe 2 on the + side of the Y axis and on the - side of the Z axis. The third outlet 2g can be opened and closed by a fourth valve 15.

[0019] A shutter 16 is provided in the flow pipe 2 so as to be able to open and close the flow passage 2a so as to divide the flow passage 2a into a first space S1 on the negative side of the Y axis including the first outlet 2e in the flow passage 2a, and a second space S2 on the positive side of the Y axis relative to the first outlet 2e in the flow passage 2a.

[0020] The pump 3 sucks gas from the flow passage 2a of the flow pipe 2. As shown in Figures 1(a) to 1(f), the pump 3 is connected to the second outlet 2f and the third outlet 2g. The pump 3 is connected to a recovery side path R1 and an exhaust side path R2.

[0021] The recovery side path R1 is connected to the tank 4 and is provided with a fifth valve 17. The tank 4 stores the gas sent from the pump 3. The exhaust side path R2 is provided with a sixth valve 18.

[0022] The CO2 adsorption member 5 collects CO2 from the gas inserted in the flow pipe 2. The CO2 adsorption member 5 can be made of a general solid adsorption member, for example, a ceramic honeycomb material used in catalysts for automobiles, etc., coated with an adsorbent capable of adsorbing CO2, such as amine.

[0023] That is, the CO2 adsorption member 5 has a honeycomb structure. As shown in Figures 1(a) to 1(f), the CO2 adsorption member 5 is disposed in the first space S1 of the flow pipe 2 between the third insertion port 2d, the second outlet port 2f, and the first outlet port 2e so as to allow gas to pass therethrough in the Y-axis direction.

[0024] The heat absorbing member 6 absorbs heat from the CO2 adsorption member 5 and is used as a heat source for heating the CO2 adsorption member 5. The heat absorbing member 6 can be made of, for example, a ceramic honeycomb material used in catalysts for automobiles, etc. In other words, the heat absorbing member 6 also has a honeycomb structure.

[0025] However, the heat absorbing member 6 only needs to be capable of heat exchange and allow fluid to pass through in the Y-axis direction. As shown in Figures 1(a) to 1(f), the heat absorbing member 6 is disposed in the second space S2 of the flow pipe 2 between the shutter 16 and the third outlet 2g so as to allow gas to pass through in the Y-axis direction.

[0026] The heating / cooling unit 7 heats or cools the CO2 adsorption member 5. As shown in Figures 1(a) to 1(f), for example, the heating / cooling unit 7 is configured to heat or cool the CO2 adsorption member 5 via the circulation pipe 2 by circulating a heat source through a pipe wound around the circulation pipe 2 so as to cover the outer periphery of the region where the CO2 adsorption member 5 is located.

[0027] 2, the control unit 8 controls the H2O supply unit 10, the first valve 11, the fan 12, the second valve 13, the third valve 14, the fourth valve 15, the shutter 16, the fifth valve 17, the sixth valve 18, the pump 3, and the heating / cooling unit 7. The control unit 8 may execute a program to realize the process of capturing gaseous CO2 using the CO2 capture device 1 described below.

[0028] Next, a flow of capturing gaseous CO2 using the CO2 capture device 1 of this embodiment will be described. In the following description, unless otherwise specified, it is assumed that the valves 11, 13, 14, 15, 17, and 18 and the shutter 16 are closed. In the following description, it is assumed that the H2O supply unit 10, the fan 12, and the pump 3 are stopped.

[0029] First, with the CO2 adsorption member 5 cooled and the heat absorption member 6 heated, the control unit 8 controls the first valve 11 and the second valve 13 to open the third insertion port 2d and the first discharge port 2e, as shown in Fig. 1(a). Then, the control unit 8 controls the fan 12 to introduce gas into the first space S1 of the circulation pipe 2. As a result, the CO2 adsorption member 5 adsorbs CO2 contained in the gas.

[0030] 1(a), the control unit 8 controls the fourth valve 15 and the sixth valve 18 to open the third outlet 2g and the exhaust-side path R2, and controls the pump 3 to suck the gas from the second space S2 of the circulation pipe 2. This allows the small amount of gas that has entered the second space S2 to be discharged via the shutter 16.

[0031] Next, as shown in Fig. 1(b), the control unit 8 controls the third valve 14 and the sixth valve 18 to open the second outlet 2f and the exhaust-side path R2, and also controls the pump 3 to suck the gas from the first space S1 of the flow pipe 2. This reduces the pressure in the first space S1 of the flow pipe 2. At this time, the control unit 8 preferably controls the fourth valve 15 to open the third outlet 2g, thereby discharging the small amount of gas that has entered the second space S2 of the flow pipe 2.

[0032] 1(c), while continuing the suction of gas by the pump 3 and the opening of the third valve 14, the control unit 8 controls the shutter 16 to connect the first space S1 and the second space S2 of the circulation pipe 2, and controls the fifth valve 17 to open the recovery side path R1. Then, the control unit 8 controls the HO supply unit 10 to insert gaseous HO from the second insertion port 2c.

[0033] At this time, the first space S1 and the second space S2 of the flow pipe 2 are preferably in a reduced pressure environment that prevents H2O from condensing in the first space S1 and the second space S2, and that can increase the rate at which CO2 is desorbed from the CO2 adsorption member 5 and suppress oxidation of the CO2 adsorption member 5 when the CO2 adsorption member 5 is heated.

[0034] As a result, the gaseous H2O passes through the heated heat absorbing member 6 and the CO2 adsorption member 5 to be recovered into the tank 4, and in this process the CO2 adsorption member 5 can be heated by the heat stored in the heat absorbing member 6.

[0035] Next, as shown in FIG. 1(d), the control unit 8 controls the fourth valve 15 to open the third outlet 2g while continuing to suck gas by the pump 3 and to open the fifth valve 17 and the shutter 16.

[0036] Then, with the first space S1 and the second space S2 of the flow pipe 2 in a reduced pressure environment, the control unit 8 controls the heating / cooling unit 7 to heat the CO2 adsorption member 5 via the flow pipe 2. This allows CO2 gradually desorbed from the CO2 adsorption member 5 to be collected in the tank 4.

[0037] Next, with the first space S1 and the second space S2 of the circulation pipe 2 in a reduced-pressure environment, the control unit 8 continues to suck gas using the pump 3, open the fourth valve 15, the fifth valve 17, and the shutter 16, and heat using the heating / cooling unit 7, as shown in FIG. 1(e), while controlling the H2O supply unit 10 to insert gaseous H2O from the first insertion port 2b into the first space S1 and the second space S2 of the circulation pipe 2, so that CO2 is pushed out of the CO2 adsorption member 5 by the H2O and the H2O passes through the heat absorbing member 6 via the heated CO2 adsorption member 5.

[0038] This allows CO2 to be efficiently recovered from the CO2 adsorption member 5, and also allows the heat absorbing member 6 to be heated by the heat stored in the CO2 adsorption member 5. Note that H2O may be separated from CO2 in the recovery path R1, or may be recovered in the tank 4 together with CO2.

[0039] When the recovery of CO2 from the CO2 adsorption member 5 is completed, the first space S1 and the second space S2 of the circulation pipe 2 are in a reduced pressure environment, and the control unit 8 continues to suction gas using the pump 3, open the fourth valve 15 and the shutter 16, and insert gaseous H2O using the H2O supply unit 10, as shown in Figure 1(f), while controlling the sixth valve 18 to open the discharge side path R2 and controlling the heating / cooling unit 7 to cool the CO2 adsorption member 5 through the circulation pipe 2.

[0040] As a result, the CO2 adsorption member 5 is cooled and regenerated to a state where it can adsorb CO2. Thereafter, by repeating the steps of Figure 1(a) to Figure 1(f), the CO2 recovery device 1 of this embodiment can recover CO2 contained in the gas.

[0041] In this way, the CO2 recovery device 1 of this embodiment is configured to transfer heat from the heated CO2 adsorption member 5 directly to the heat absorbing member 6 by gaseous H2O to heat the heat absorbing member 6, and when heating the CO2 adsorption member 5, transfer heat from the heated heat absorbing member 6 directly to the CO2 adsorption member 5 by gaseous H2O to heat the CO2 adsorption member 5. Therefore, the CO2 recovery device 1 of this embodiment can contribute to improving the efficiency of exhaust heat utilization compared to the CO2 recovery device of Patent Document 1.

[0042] Furthermore, in the CO2 recovery device 1 of this embodiment, the third outlet 2g used when recovering CO2 is positioned downstream of the flow of H2O relative to the CO2 adsorption member 5, so that the CO2 pushed out by H2O from the CO2 adsorption member 5 can be recovered effectively.

[0043] Furthermore, in the CO2 recovery device 1 of this embodiment, the CO2 adsorption member 5 has a honeycomb structure, so that the area in contact with the gas is large, and the CO2 adsorption efficiency can be improved.

[0044] Furthermore, the CO2 recovery device 1 of this embodiment uses gaseous H2O as a fluid for heating and cooling the CO2 adsorption member 5 and for pushing CO2 out of the CO2 adsorption member 5, thereby making it possible to suppress oxidation of the CO2 adsorption member 5 that has adsorbed CO2 and wetting of the CO2 adsorption member.

[0045] <Embodiment 2> Figures 3(a) to 3(h) are diagrams for explaining the CO2 capture cycle in the CO2 capture device of this embodiment. Figure 4 is a block diagram showing the configuration of the control system of the CO2 capture device of this embodiment. In the following explanation, the same members as in embodiment 1 will be described using the same reference numerals. Here, in Figures 3(a) to 3(h), the flows of gas and H2O are shown with dashed lines, and the fan 12 is omitted as appropriate.

[0046] As shown in Figures 3(a) to 3(h), the CO2 recovery device 21 of this embodiment is configured to utilize the basic principle of exhaust heat utilization of the CO2 recovery device 1 of embodiment 1, while using a second CO2 adsorption member 22 as a heat absorption member 6, thereby being able to recover CO2 alternately from the CO2 adsorption member (first CO2 adsorption member) 5 and the second CO2 adsorption member 22.

[0047] The second CO2 adsorption member 22 may have substantially the same configuration as the first CO2 adsorption member 5. As shown in Figures 3(a) to 3(h), the second CO2 adsorption member 22 can be heated and cooled by a second heating / cooling unit 23 via a flow pipe 24.

[0048] 3(a) to 3(h), a fourth insertion port 24a is provided at the end portion on the +Y-axis side and on the +Z-axis side of the flow pipe 24. The fourth insertion port 24a can be opened and closed by a seventh valve 31.

[0049] 3(a) to 3(h), a fourth outlet 24b is provided in the flow pipe 24 between the first CO2 adsorption member 5 and the first outlet 2e, at the end of the flow pipe 24 on the negative Z-axis side. The fourth outlet 24b can be opened and closed by an eighth valve 32.

[0050] 3(a) to 3(h), a fifth outlet 24c is provided in the flow pipe 24 between the second CO2 adsorption member 22 and the shutter (first shutter) 16, at the end of the flow pipe 24 on the negative Z-axis side. The fifth outlet 24c can be opened and closed by a ninth valve 33.

[0051] 3(a) to 3(h), a second shutter 34 is provided between the first outlet 2e and the fourth outlet 24b in the flow pipe 24 so as to be able to open and close the flow passage 2a. That is, with the first outlet 2e between them in the Y-axis direction, the first shutter 16 is disposed on the +Y-axis side, and the second shutter 34 is disposed on the -Y-axis side.

[0052] As a result, as shown in Figures 3(a) to 3(h), the flow pipe 24 can be divided into a first space S3 on the negative Y-axis side of the first outlet 2e in the flow passage 2a, a second space S4 on the positive Y-axis side of the first outlet 2e in the flow passage 2a, and a third space S5 around the first outlet 2e in the flow passage 2a.

[0053] As shown in FIG. 4, the control unit 25 controls the HO supply unit 10, the first valve 11, the fan 12, the second valve 13, the third valve 14, the fourth valve 15, the first shutter 16, the fifth valve 17, the sixth valve 18, the pump 3, and the heating / cooling unit (first heating / cooling unit) 7, as well as the second heating / cooling unit 23, the seventh valve 31, the eighth valve 32, the ninth valve 33, and the second shutter 34.

[0054] Next, a flow of capturing gaseous CO2 using the CO2 capture device 21 of this embodiment will be described. In the following description, unless otherwise specified, it is assumed that the valves 11, 13, 14, 15, 17, 18, 31, 32, and 33, the first shutter 16, and the second shutter 34 are closed. In the following description, it is assumed that the H2O supply unit 10, the fan 12, and the pump 3 are stopped.

[0055] First, the first CO2 adsorption member 5 is cooled, the second CO2 adsorption member 22 is heated after adsorbing CO2, and the second space S4 of the circulation pipe 24 is in a reduced pressure environment. As shown in Figure 3(a), the control unit 25 controls the second shutter 34 to connect the first space S3 of the circulation pipe 24 to the third space S5.

[0056] Here, the reduced pressure environment is preferably one in which H2O does not condense in the flow passage 24a of the flow pipe 24, and which can increase the desorption rate of CO2 from the first CO2 adsorption member 5 or the second CO2 adsorption member 22 and suppress oxidation of the first CO2 adsorption member 5 or the second CO2 adsorption member 22.

[0057] 3(a), the control unit 25 controls the first valve 11 and the second valve 13 to open the third insertion port 2d and the first discharge port 2e. The control unit 25 also controls the fan 12 to introduce gas into the first space S3 and the third space S5 of the flow pipe 2. As a result, the first CO2 adsorption member 5 adsorbs CO2 contained in the gas.

[0058] At the same time, as shown in Figure 3(a), the control unit 25 controls the second heating / cooling unit 23 to heat the second CO2 adsorption member 22 through the circulation pipe 24, while controlling the ninth valve 33 and the fifth valve 17 to open the fifth outlet 24c and the recovery side path R1.

[0059] 3(a), the control unit 25 controls the pump 3 to maintain a reduced pressure environment in the second space S4 of the flow pipe 24, and controls the H2O supply unit 10 to insert gaseous H2O from the second insertion port 2c into the second space S4 of the flow pipe 2. As a result, CO2 pushed out of the second CO2 adsorption member 22 by the gaseous H2O is collected in the tank 4.

[0060] Next, as shown in Fig. 3(b), the control unit 25 controls the third valve 14 and the sixth valve 18 to open the second outlet 2f and the discharge-side path R2 while continuing the gas suction by the pump 3 and the opening of the second shutter 34. This places the first space S3 and the third space S5 of the flow pipe 24 in a reduced-pressure environment. At this time, the side of the second CO2 adsorption member 22 is in a standby state.

[0061] Next, as shown in FIG. 3(c), while maintaining the pump 3 sucking gas and the second shutter 34 and the third valve 14 open, the control unit 25 controls the first shutter 16 to connect the first space S3, the third space S5 and the second space S4 of the flow pipe 24, and controls the fifth valve 17 to open the recovery side path R1.

[0062] 3(c), with the first space S3, the second space S4, and the third space S5 of the flow pipe 24 in a reduced-pressure environment, the control unit 25 controls the H2O supply unit 10 to insert gaseous H2O from the second insertion port 2c into the first space S3, the second space S4, and the third space S5 of the flow pipe 2, and passes the gaseous H2O through the second CO2 adsorption member 22 in which heat has been stored and then to the first CO2 adsorption member 5. This makes it possible to cool the second CO2 adsorption member 22 and to heat the first CO2 adsorption member 5 by the heat stored in the second CO2 adsorption member 22.

[0063] 3(d), the control unit 25 controls the eighth valve 32 to open the fourth outlet 24b while maintaining the gas suction by the pump 3 and the open state of the fifth valve 17. Then, with the first space S3 of the circulation pipe 24 in a reduced pressure environment, the control unit 25 controls the first heating / cooling unit 7 to heat the first CO2 adsorption member 5 via the circulation pipe 24. As a result, CO2 gradually desorbed from the first CO2 adsorption member 5 is collected in the tank 4.

[0064] 3(d), the control unit 25 controls the second heating / cooling unit 23 to cool the second CO2 adsorption member 22 through the circulation pipe 24. As a result, the second CO2 adsorption member 22 is cooled and regenerated to a state capable of adsorbing CO2.

[0065] Next, under a reduced pressure environment in the first space S3 of the flow pipe 24, the control unit 25 controls the HO supply unit 10 to insert gaseous HO from the first insertion port 2b into the first space S3 of the flow pipe 2, while maintaining the suction of gas by the pump 3, the opening of the fifth valve 17 and the eighth valve 32, and the heating by the first heating / cooling unit 7, as shown in Fig. 3(e). As a result, CO2 pushed out of the first CO2 adsorption member 5 by the gaseous HO is collected in the tank 4.

[0066] At the same time, as shown in FIG. 3(e), the control unit 25 controls the second valve 13 and the seventh valve 31 to open the first discharge port 2e and the fourth insertion port 24a, and controls the first shutter 16 to connect the second space S4 and the third space S5 of the flow pipe 24.

[0067] 3(e), the control unit 25 controls the fan 12 to introduce the gas into the second space S4 and the third space S5 of the flow pipe 2. As a result, the second CO2 adsorption member 22 adsorbs the CO2 contained in the gas.

[0068] Next, as shown in Fig. 3(f), the control unit 25 controls the fourth valve 15 and the sixth valve 18 to open the third outlet 2g and the discharge-side path R2 while continuing to suck gas by the pump 3 and open the first shutter 16. This creates a reduced-pressure environment in the second space S4 and the third space S5 of the flow pipe 24. At this time, the side of the first CO2 adsorption member 5 is in a standby state.

[0069] Next, as shown in FIG. 3(g), while maintaining the pump 3 sucking gas and the first shutter 16 and the fourth valve 15 open, the control unit 25 controls the second shutter 34 to connect the first space S3, the third space S5 and the second space S4 of the flow pipe 24, and controls the fifth valve 17 to open the recovery side path R1.

[0070] 3(g), with the first space S3, the second space S4, and the third space S5 of the flow pipe 24 in a reduced-pressure environment, the control unit 25 controls the H2O supply unit 10 to insert gaseous H2O from the first insertion port 2b into the first space S3, the second space S4, and the third space S5 of the flow pipe 2, and passes the gaseous H2O through the first CO2 adsorption member 5 in which heat has been stored and into the second CO2 adsorption member 22. This allows the first CO2 adsorption member 5 to be cooled, and the second CO2 adsorption member 22 to be heated by the heat stored in the first CO2 adsorption member 5.

[0071] 3(h), the control unit 25 controls the ninth valve 33 to open the fifth outlet 24c while maintaining the gas suction by the pump 3 and the opening of the fifth valve 17. Then, with the second space S4 of the circulation pipe 24 in a reduced pressure environment, the control unit 25 controls the second heating / cooling unit 23 to heat the second CO2 adsorption member 22 via the circulation pipe 24. As a result, CO2 gradually desorbed from the second CO2 adsorption member 22 is collected in the tank 4.

[0072] At the same time, as shown in Fig. 3(h), the control unit 25 controls the first heating / cooling unit 7 to cool the first CO2 adsorption member 5 through the circulation pipe 24. As a result, the first CO2 adsorption member 5 is cooled and regenerated to a state capable of adsorbing CO2.

[0073] Thereafter, by repeating the steps of Figures 3(a) to 3(h), the CO2 recovery device 21 of this embodiment can recover CO2 contained in the gas alternately using the first CO2 adsorption member 5 and the second CO2 adsorption member 22.

[0074] As described above, the CO2 recovery device 21 of this embodiment is configured such that, when heating the second CO2 adsorption member 22, the heat of the heated first CO2 adsorption member 5 is transferred directly from the first CO2 adsorption member 5 to the second CO2 adsorption member 22 by gas-phase H2O, thereby heating the second CO2 adsorption member 22, and when heating the first CO2 adsorption member 5, the heat of the heated second CO2 adsorption member 22 is transferred directly from the second CO2 adsorption member 22 to the first CO2 adsorption member 5 by gas-phase H2O, thereby heating the first CO2 adsorption member 5. Therefore, the CO2 recovery device 21 of this embodiment can also contribute to improving the efficiency of exhaust heat utilization compared to the CO2 recovery device of Patent Document 1.

[0075] Moreover, since the gaseous CO2 can be captured alternately by the first CO2 adsorption member 5 and the second CO2 adsorption member 22, the gaseous CO2 can be efficiently captured.

[0076] The present disclosure is not limited to the above-described embodiments, and can be modified as appropriate within the scope of the present disclosure. In the above embodiment, gaseous H20 is inserted into the flow pipes 2 and 24, but any fluid capable of transferring heat may be used. [Explanation of symbols]

[0077] 1. Recovery device 2 flow pipe, 2a flow passage, 2b first insertion port, 2c second insertion port, 2d third insertion port, 2e first discharge port, 2f second discharge port, 2g third discharge port 3. Pump 4 Tank 5 CO2 adsorption member (first CO2 adsorption member) 6 Heat absorption material 7 Heating / Cooling Section (First Heating / Cooling Section) 8 Control Unit 10 H2O Supply Unit 11 First valve, 13 Second valve, 14 Third valve, 15 Fourth valve, 17 Fifth valve, 18 Sixth valve 12 Fans 16 Shutter (First Shutter) 21 CO2 capture equipment 22 Second CO2 adsorption member 23 Second heating / cooling section 24 flow pipe, 24a fourth insertion port, 24b fourth discharge port, 24c fifth discharge port 25 Control Unit 31 Seventh valve, 32 Eighth valve, 33 Ninth valve 34 Second Shutter R1: Recovery route, R2: Exhaust route S1 first space, S2 second space, S3 first space, S4 second space, S5 third space

Claims

1. CO contained in the gas ２ CO2 recovery ２ A recovery device, CO ２ a flow passage through which the gas flows to recover the A first CO ２ an adsorption member; The first CO ２ a heat absorbing member arranged alongside the adsorption member; The first CO ２ a first insertion port for inserting the fluid into the flow passage so that the fluid flows to the heat absorbing member via an adsorption member; The first CO ２ a second insertion port for inserting the fluid into the flow path so that the fluid flows through the adsorption member; Equipped with CO ２ the first CO ２ The fluid is passed through an adsorption member to the heat absorption member to heat the heat absorption member, and the first CO ２ When the adsorption member is heated, the first CO ２ The fluid is passed through the adsorption member to adsorb the first CO ２ Heat the adsorption member, CO ２ Recovery device.

2. The first CO ２ CO from the adsorption member ２ When desorbing the first CO ２ The fluid is passed through the heat absorbing member via an adsorption member, and the first CO ２ CO is discharged from an outlet provided on the heat absorbing member side of the adsorption member. ２ The CO according to claim 1 ２ Recovery device.

3. The heat absorbing member is a second CO ２ an adsorption member, The second CO ２ When the adsorption member is heated, the first CO ２ The second CO ２ The fluid is passed through the adsorption member to adsorb the second CO ２ Heating the adsorption member; The first CO ２ When the adsorption member is heated, the second CO ２ The first CO ２ The fluid is passed through the adsorption member to adsorb the first CO ２ 3. The CO adsorption method according to claim 1, wherein the adsorption member is heated. ２ Recovery device.

4. The first CO ２ 3. The CO 2 adsorption device according to claim 1, wherein the adsorption member and the heat absorption member have a honeycomb structure. ２ Recovery device.

5. The fluid is in the form of gaseous H under a reduced pressure environment in the flow passage. ２ 3. The CO of claim 1 or 2, ２ Recovery device.

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