Co2 removal device and combustion facility

Abstract

This CO2 removal device for removing CO2 from a gas is provided with: a cylindrical housing; a plate-shaped first carrier for supporting, on the surface thereof, an adsorbent that adsorbs CO2, the first carrier being disposed inside the housing; and a plate-shaped second carrier for supporting, on the surface thereof, an adsorbent that adsorbs CO2, the second carrier being disposed inside the housing such that a gas flow path for circulating the gas is formed between the first carrier and the second carrier. The first carrier includes at least one first ridge portion that protrudes toward the second carrier and extends inside the gas flow path so as to be inclined at a first angle with respect to the extending direction of the housing. The second carrier includes at least one second ridge portion that protrudes toward the first carrier so as to be in contact with the first ridge portion and extends inside the gas flow path so as to be inclined at a second angle that intersects a direction in which the first ridge portion extends and is different from the first angle with respect to the extending direction.

Description

CO₂ Removal Device and Combustion Equipment

[0001] The present disclosure relates to a CO₂ removal device that removes CO₂ from a gas, and combustion equipment including this CO₂ removal device. This application claims priority based on Japanese Patent Application No. 2024-158191 filed with the Japan Patent Office on September 12, 2024, and Japanese Patent Application No. 2025-015889 filed with the Japan Patent Office on February 3, 2025, the contents of which are incorporated herein by reference.

[0002] For example, Patent Document 1 discloses a CO₂ removal device including a structure (honeycomb monolith) including a plurality of vertical channels formed by extending a wall containing a CO₂ adsorbent from a gas inlet toward a gas outlet. Further, Patent Document 1 describes heating an adsorbent that has adsorbed CO₂ with the heat of steam and separating CO₂ from this adsorbent.

[0003] Japanese Patent Publication No. 2023-520609

[0004] However, the technique described in Patent Document 1 does not disclose or suggest a technique for suppressing the energy (amount of steam) required for separating CO₂ from the adsorbent that has adsorbed CO₂.

[0005] The present disclosure has been made in view of the above problems, and an object thereof is to provide a CO₂ removal device capable of suppressing the energy required for separating CO₂ from an adsorbent.

[0006] To achieve the above objective, the CO2 removal device according to the present disclosure is a CO2 removal device for removing CO2 from a gas, comprising: a cylindrical housing; a plate-shaped first carrier having an adsorbent for adsorbing CO2 on its surface, the first carrier being disposed within the housing; and a plate-shaped second carrier having an adsorbent for adsorbing CO2 on its surface, the second carrier being disposed within the housing such that a gas flow path is formed between it and the first carrier for circulating the gas, wherein the first carrier includes at least one first projection that protrudes toward the second carrier and extends within the gas flow path at a first angle with respect to the extending direction of the housing, and the second carrier includes at least one second projection that protrudes toward the first carrier so as to contact the first projection, and extends within the gas flow path at a second angle different from the first angle with respect to the extending direction, intersecting the direction in which the first projection extends.

[0007] The CO2 removal apparatus of this disclosure can suppress the energy required to separate CO2 from the adsorbent.

[0008] This is a perspective view showing the configuration of a CO2 removal device according to one embodiment. This is an enlarged view of a part of the first carrier according to one embodiment. This is an enlarged view of a part of the second carrier according to one embodiment. This is a perspective view showing enlarged views of parts of the first and second carriers according to one embodiment. This is an enlarged view of a part of the third carrier according to one embodiment. This is a perspective view showing enlarged views of parts of the first and third carriers according to one embodiment. This is a diagram for explaining the operation and effects of a CO2 removal device according to one embodiment. This is a diagram schematically showing the configuration of a combustion facility equipped with a CO2 removal device according to one embodiment. This is a diagram schematically showing an example of the configuration of a combustion facility different from that of Figure 8.

[0009] Hereinafter, a CO2 removal device and a combustion system equipped with this CO2 removal device according to embodiments of the present disclosure will be described with reference to the drawings. Such embodiments represent one aspect of the present disclosure and are not limiting, and can be modified at will within the scope of the technical concept of the present disclosure.

[0010] <CO2 Removal Device> (Configuration) The CO2 removal device according to this disclosure removes CO2 from a gas. The gas from which CO2 is to be removed is not particularly limited. In some embodiments, the CO2 removal device employs Direct Air Capture (DAC), which recovers CO2 from the atmosphere. In some embodiments, the CO2 removal device is located upstream of the turbocharger and removes CO2 from the intake air of the turbocharger.

[0011] Figure 1 is a perspective view showing the configuration of a CO2 removal device 1 according to one embodiment. As shown in Figure 1, the CO2 removal device 1 includes a housing 2, a first carrier 4, and a second carrier 6.

[0012] The housing 2 extends in a cylindrical shape, with openings at both end faces in the extending direction D1. The housing 2 is positioned in a flow path through which air A, which is to be treated for CO2 removal, flows. One opening is an inlet 2a for air A to flow into the housing 2, and the other opening is an outlet 2b for the CO2-removed air A1 to flow out from inside the housing 2. In the embodiment illustrated in Figure 1, the housing 2 has a rectangular cylindrical shape with the extending direction D1 being the longitudinal side, but this disclosure is not limited to this embodiment. In some embodiments, the housing 2 has a cylindrical shape. In some embodiments, the housing 2 has a curved cylindrical shape. Existing piping or ducts may be used as the housing 2.

[0013] Each of the first carrier 4 and the second carrier 6 has a plate-like shape and is arranged inside the housing 2. As shown in Figure 1, the plate-shaped second carrier 6 is arranged inside the housing 2 such that a gas channel 3 is formed between it and the plate-shaped first carrier 4 for the circulation of air A. The second carrier 6 is stacked on the first carrier 4 along the height direction D2 of the housing 2. The second carrier 6 is located on one side of the height direction D2 compared to the first carrier 4. Hereinafter, the direction perpendicular to the extension direction D1 and the height direction D2 will be referred to as the width direction D3 (width direction of the housing 2).

[0014] Figure 2 is an enlarged view of a part of the first carrier 4 according to one embodiment. As shown in Figure 2, the first carrier 4 has an adsorbent 14 that adsorbs CO2 on its surface 12. The first carrier 4 has the adsorbent 14 supported over the entire surface 12. The first carrier 4 is made of a ceramic such as cordierite. The adsorbent 14 is not particularly limited as long as it can adsorb CO2, for example, an amine. In the figures other than Figure 2, the adsorbent 14 is not shown on the surface 12 of the first carrier 4, but the first carrier 4 will be described assuming that it has the adsorbent 14 supported on it.

[0015] Figure 3 is an enlarged view of a part of the second carrier 6 according to one embodiment. As shown in Figure 3, the second carrier 6 has an adsorbent 14 that adsorbs CO2 on its surface 22. The adsorbent 14 is supported over the entire surface 22 of the second carrier 6. The second carrier 6 is manufactured from a ceramic such as cordierite. The adsorbent 14 is not particularly limited as long as it can adsorb CO2, for example, an amine. In the figures other than Figure 3, the adsorbent 14 is not shown on the surface 22 of the second carrier 6, but the second carrier 6 will be described assuming that it supports the adsorbent 14.

[0016] Figure 4 is an enlarged perspective view showing a part of the first carrier 4 and a part of the second carrier 6 according to one embodiment, and is a diagram for explaining the configuration of the first carrier 4 and the configuration of the second carrier 6, respectively.

[0017] The first carrier 4 includes a first projection 8 that protrudes toward the second carrier 6. This first projection 8 extends within the gas flow path 3 at a first angle θ1 with respect to the extension direction D1. In one embodiment, as illustrated in Figure 4, the length of the first projection 8 in the width direction D3 narrows toward the second carrier 6, and the cross-section has a triangular shape. Let the first imaginary line L1 be an imaginary straight line passing through the center of the triangular base of the first projection 8. The first angle θ1 is the smaller angle on the inlet 2a side of the first imaginary line L1, when the first projection 8 is viewed from the height direction D2, between the extension line Ld, which extends parallel to the extension direction D1, and the first imaginary line L1. In other words, the first angle θ1 is the angle of inclination with respect to the inflow direction (inflow direction of air A) toward the airflow into the housing 2. This first angle θ1 is between 15 degrees and 60 degrees. The first carrier 4 includes a plurality of first protrusions 8 arranged along the width direction D3 (see Figure 1). The plurality of first protrusions 8 are arranged at a predetermined pitch in the width direction D3.

[0018] In one embodiment, as illustrated in Figure 4, the first carrier 4 includes an opposite first projection 9 that protrudes toward the other side in the height direction D2 (see the third carrier 30, described later, in Figure 6). This opposite first projection 9 extends at an inclination of a third angle θ3 with respect to the extension direction D1. The opposite first projection 9 has a narrowing in width direction D3 as it approaches the other side in the height direction D2, and has a triangular cross-section. Let the third virtual line L3 be a virtual straight line passing through the center of the triangular base of the opposite first projection 9. The third angle θ3 is the smaller angle on the inlet 2a side of the angle formed by the extension line Ld and the third virtual line L3 when the opposite first projection 9 is viewed from the height direction D2. In other words, the third angle θ3 is the inclination angle with respect to the air inflow direction. This third angle θ3 is between 15 degrees and 60 degrees. The first carrier 4 includes a plurality of opposite first protrusions 9 arranged along the width direction D3 (see Figure 1). The plurality of opposite first protrusions 9 are arranged at a predetermined pitch in the width direction D3.

[0019] In one embodiment, the ridge 8a of the first projection 8 and the ridge 9a of the opposite first projection 9 extend parallel to each other, and the first angle θ1 and the third angle θ3 are the same. In one embodiment, the first carrier 4 includes the first projection 8 and the opposite first projection 9 which are continuous in the width direction D3, forming a zigzag shape. In some embodiments, the first projection 8 and the opposite first projection 9 extend so as to intersect each other. In some embodiments, the first carrier 4 includes the first projection 8 and the opposite first projection 9 which are spaced apart from each other in the width direction D3.

[0020] The second carrier 6 includes a second protrusion 10 that projects toward the first carrier 4 so as to contact the first protrusion 8. The second protrusion 10 extends within the gas flow path 3, intersecting the direction in which the first protrusion 8 extends, and inclined at a second angle θ2 different from the first angle θ1 with respect to the extension direction D1. In one embodiment, as illustrated in Figure 4, the length of the second protrusion 10 in the width direction D3 narrows toward the first carrier 4, and the cross-section has a triangular shape. The ridge 10a of the second protrusion 10 and the ridge 8a of the first protrusion 8 are in point contact at position P. Let the second virtual line L2 be a virtual straight line passing through the center of the triangular base of the second protrusion 10. The second angle θ2 is the smaller angle on the inlet 2a side of the angle formed by the extension line Ld and the second virtual line L2 when the second protrusion 10 is viewed from the height direction D2. In other words, the second angle θ2 is the angle of inclination with respect to the direction of air A inflow. This second angle θ2 is between 15 degrees and 60 degrees. The second carrier 6 includes a plurality of second protrusions 10 arranged along the width direction D3 (see Figure 1). The plurality of second protrusions 10 are arranged at a predetermined pitch in the width direction D3.

[0021] In one embodiment, as illustrated in Figure 4, the second carrier 6 includes a second opposite projection 11 that protrudes toward one side in the height direction D2 (opposite to the side of the first carrier 4). This second opposite projection 11 extends at a fifth angle θ5 with respect to the extension direction D1. The length in the width direction D3 of the second opposite projection 11 narrows toward one side in the height direction D2, and its cross-section has a triangular shape. Let the fifth imaginary line L5 be an imaginary straight line passing through the center of the triangular base of the second opposite projection 11. The fifth angle θ5 is the smaller angle on the inlet 2a side of the angle formed by the extension line Ld and the fifth imaginary line L5 when the second opposite projection 11 is viewed from the height direction D2. In other words, the fifth angle θ5 is the angle of inclination with respect to the air inflow direction. This fifth angle θ5 is between 15 and 60 degrees. The second carrier 6 includes a plurality of opposite second protrusions 11 arranged along the width direction D3 (see Figure 1). The plurality of opposite second protrusions 11 are arranged at a predetermined pitch in the width direction D3.

[0022] In one embodiment, the ridge 10a of the second projection 10 and the ridge 11a of the opposite second projection 11 extend parallel to each other, and the second angle θ2 and the fifth angle θ5 are the same. In one embodiment, the second carrier 6 includes the second projection 10 and the opposite second projection 11 which are continuous in the width direction D3, so as to form a zigzag shape. In some embodiments, the second projection 10 and the opposite second projection 11 extend so as to intersect each other. In some embodiments, the second carrier 6 includes the second projection 10 and the opposite second projection 11 which are spaced apart from each other in the width direction D3.

[0023] In one embodiment, as illustrated in Figure 1, the CO2 removal device 1 further includes a third carrier 30. The third carrier 30 has a plate shape and is arranged inside the housing 2. The plate-shaped third carrier 30 is arranged inside the housing 2 on the opposite side of the second carrier 6, with the first carrier 4 in between, such that a second gas flow path 33 for circulating air A is formed between it and the plate-shaped first carrier 4. The third carrier 30 is stacked on the first carrier 4 along the height direction D2 of the housing 2. The third carrier 30 is located on the other side of the height direction D2 from the first carrier 4. In other words, the second carrier 6, the first carrier 4, and the third carrier 30 are stacked in order from one side of the height direction D2.

[0024] Figure 5 is an enlarged view of a part of the third carrier 30 according to one embodiment. As illustrated in Figure 5, the third carrier 30 is similar to the first carrier 4 and the second carrier 6, respectively, and has an adsorbent 14 that adsorbs CO2 supported on its surface 32. The adsorbent 14 is supported over the entire surface 32 of the third carrier 30. The third carrier 30 is manufactured from a ceramic such as cordierite. The adsorbent 14 is not particularly limited as long as it can adsorb CO2, for example, an amine. In the figures other than Figure 5, the adsorbent 14 is not shown on the surface 32 of the third carrier 30, but the third carrier 30 will be described assuming that it supports the adsorbent 14.

[0025] Figure 6 is an enlarged perspective view showing a part of the first carrier 4 and a part of the third carrier 30 according to one embodiment, and is a diagram for explaining the configuration of the third carrier 30.

[0026] The third carrier 30 includes a third protrusion 34 that projects toward the first carrier 4 so as to contact the opposite first protrusion 9. The third protrusion 34 extends within the second gas flow path 33, intersecting the direction in which the opposite first protrusion 9 extends, and is inclined at a fourth angle θ4 different from the third angle θ3 with respect to the extension direction D1. The length of the third protrusion 34 in the width direction D3 narrows toward the first carrier 4, and its cross-section is triangular. The ridge 34a of the third protrusion 34 and the ridge 9a of the opposite first protrusion 9 are in point contact at the second position P2. Let the fourth imaginary line L4 be an imaginary straight line passing through the center of the triangular base of the third protrusion 34. The fourth angle θ4 is the smaller angle on the inlet 2a side of the angle formed by the extension line Ld and the fourth imaginary line L4 when the third protrusion 34 is viewed from the height direction D2. In other words, the fourth angle θ4 is the angle of inclination with respect to the direction of air A inflow. This fourth angle θ4 is between 15 degrees and 60 degrees. The third carrier 30 includes a plurality of third protrusions 34 arranged along the width direction D3 (see Figure 1). The plurality of third protrusions 34 are arranged at a predetermined pitch in the width direction D3.

[0027] In one embodiment, as illustrated in Figure 6, the third carrier 30 includes an opposite third projection 36 that protrudes toward the other side in the height direction D2 (opposite to the first carrier 4 side). This opposite third projection 36 extends at an inclination with respect to the extending direction D1. The opposite third projection 36 has a narrowing in length in the width direction D3 as it moves toward the other side in the height direction D2, and has a triangular cross-section. In other words, the opposite third projection 36 is inclined with respect to the air inflow direction A. The third carrier 30 includes a plurality of opposite third projections 36 arranged along the width direction D3 (see Figure 1). The plurality of opposite third projections 36 are arranged at a predetermined pitch in the width direction D3.

[0028] In one embodiment, the second carrier 6 has the same shape as the first carrier 4. The second carrier 6, which is placed inside the housing 2, is the first carrier 4, which is placed inside the housing 2, inverted. The third carrier 30 has the same shape as the first carrier 4. The third carrier 30, which is placed inside the housing 2, is the first carrier 4, which is placed inside the housing 2, inverted. In other words, three or more first carriers 4 are stacked inside the housing 2, alternatingly inverted, and multiple gas channels 3 for circulating air A are formed inside the housing 2. The second angle θ2 and the fourth angle θ4 are the same angle. In some embodiments, the first carrier 4 and the second carrier 6 have different shapes. In some embodiments, the first carrier 4 and the third carrier 30 have different shapes.

[0029] Hereafter, when multiple first carriers 4 are mentioned, it includes all plate-shaped carriers (including the first carrier 4, the second carrier 6, and the third carrier 30) arranged within the housing 2. When multiple gas flow paths 3 are mentioned, it includes all gas flow paths (including the gas flow path 3 and the second gas flow path 33) formed between the plate-shaped carriers within the housing 2.

[0030] (Operation and Effects) The operation and effects of a CO2 removal device 1 according to one embodiment will be described. The reaction that takes place between the air A flowing inside the housing 2 and the adsorbent 14 (catalyst) inside the housing 2 is expressed by the equation 1 / K = 1 / Kr + 1 / Kf. Here, K is the CO2 adsorption rate of the entire adsorbent 14, Kr is the CO2 adsorption rate of the adsorbent 14, and Kf is the mass transfer coefficient for the movement of CO2 from the air A to the adsorbent 14. Therefore, by increasing the mass transfer coefficient Kf, the CO2 adsorption rate K of the entire adsorbent 14 increases, and the performance of the CO2 removal device 1 is improved.

[0031] Figure 7 is a diagram illustrating the operation and effects of a CO2 removal device 1 according to one embodiment, and shows the gas flow path 3 viewed from the width direction D3. According to one embodiment, as shown in Figure 7, the air A flowing into the gas flow path 3 flows along the convex surface 8b of the first protrusion 8, the concave surface 9b of the opposite first protrusion 9, the convex surface 10b of the second protrusion 10, and the concave surface 11b of the opposite second protrusion 11. This disrupts the flow of air A in the gas flow path 3, making it easier for the CO2 contained in the air A to come into contact with the adsorbent 14, thereby increasing the mass transfer coefficient Kf. Furthermore, by disrupting the flow of air A, the boundary film of the adsorbent 14 is thinned, improving the reaction rate of the adsorbent 14.

[0032] Thus, according to one embodiment, the flow of air A in the multiple gas channels 3 formed within the housing 2 is disrupted, promoting the movement of CO2 from air A to the adsorbent 14 (hereinafter referred to as mass transfer), and this promotion of mass transfer improves the CO2 adsorption performance. Therefore, even if the volume of each of the multiple first carriers 4 arranged within the housing 2 is reduced, a certain amount of CO2 adsorption can be achieved, and the adsorbent area (mass) is minimized, thereby reducing the amount of atmospheric moisture adsorbed on each of the multiple first carriers 4. Consequently, when heating the adsorbent 14 to separate CO2 from the adsorbent 14, the energy used to heat each of the multiple first carriers 4 can be reduced. Therefore, the energy required to separate CO2 from the adsorbent 14 can be suppressed. In addition, by reducing the volume of each of the multiple first carriers 4, the size of the housing 2 can also be reduced, making the CO2 removal device 1 more compact.

[0033] According to one embodiment, air A flows through the gas flow path 3 at an inclination with respect to the extending direction D1 by the first protrusion 8 and the second protrusion 10. Therefore, compared to the case where air A flows through the gas flow path 3 parallel or nearly parallel to the extending direction D1, the air A can be retained in the housing 2 for a longer period, and the amount of CO2 adsorbed by the adsorbent 14 can be increased.

[0034] The first protrusion 8 and the second protrusion 10 allow air A to remain in the housing 2 for a longer period as the first angle θ1 and the second angle θ2 approach 90 degrees, but the pressure loss of air A due to the obstruction of air flow becomes very large. The same applies to the opposite first protrusion 9, the opposite second protrusion 11, and the third protrusion 34, where the pressure loss of air A becomes very large as the third angle θ3 to the fifth angle θ5 approach 90 degrees. According to one embodiment, since each of the first angle θ1 to the fifth angle θ5 is between 15 degrees and 60 degrees, the time that air A remains in the housing 2 can be extended while suppressing the increase in pressure loss of air A.

[0035] As described above, when the air A is configured to flow through the gas flow path 3 parallel or nearly parallel to the extension direction D1, the first protrusion 8 and the second protrusion 10 extend parallel or nearly parallel to the extension direction D1. In this case, the plate-shaped first carrier 4 has high bending strength in the extension direction D1, but low bending strength in the width direction D3. As a result, the first carrier 4 may bend, and the cross-sectional area of ​​the gas flow path 3 may become irregular. According to one embodiment, since each of the first angle θ1 to the fifth angle θ5 is between 15 degrees and 60 degrees, the rigidity in the width direction D3 of each of the multiple first carriers 4 is increased, and the occurrence of bending is suppressed. As a result, the irregular changes in the cross-sectional area of ​​each of the multiple gas flow paths 3 are reduced, and the occurrence of regions with low mass transfer in each of the multiple gas flow paths 3 can be suppressed.

[0036] According to one embodiment, since the multiple first carriers 4 (for example, the first carrier 4 and the second carrier 6) are stacked so as to be in point contact with each other, the flow of air A can be disturbed at the point contact portion (position P). Furthermore, since the point contact portion is only a part of the ridge 8a of the first protrusion 8 and the ridge 10a of the second protrusion 10, it is possible to prevent the pressure loss of air A from becoming extremely high.

[0037] According to one embodiment, since the second carrier 6 and the third carrier 30 each have the same shape as the first carrier 4, the second carrier 6 and the third carrier 30 can each be manufactured in the same way as the first carrier 4. Therefore, the manufacturing cost of the CO2 removal device 1 can be reduced.

[0038] <Combustion Equipment> Figure 8 is a schematic diagram showing the configuration of a combustion equipment 100 equipped with a CO2 removal device 1 according to one embodiment. As shown in Figure 8, the combustion equipment 100 includes a CO2 removal device 1, a combustion device 102, a generator 104, a boiler 106, a heating device 124, a CO2 recovery device 130, and a processing device 140.

[0039] The combustion device 102 is configured such that CO2-removed air A1, which is air A from which CO2 has been removed by the CO2 removal device 1, is introduced into the compressor 110. In other words, in the direction in which the combustion air of the combustion equipment 100 flows, the CO2 removal device 1 is located upstream of the combustion device 102. In one embodiment, the combustion device 102 is a gas turbine 102A (102), and in addition to the compressor 110, it includes a combustor 112 and a turbine 114. The generator 104 is connected to the turbine 114. In the embodiment illustrated in Figure 8, the gas turbine 102A is a single-shaft gas turbine, and the compressor 110 and the turbine 114 are connected by a connecting shaft 116 and configured to rotate as a single unit. The turbine 114 and the generator 104 are connected via the connecting shaft 116, and the generator 104 is driven by the turbine 114 to generate electricity.

[0040] The compressor 110 compresses the CO2-removed air A1 supplied from the CO2 removal device 1 to produce compressed air A2, and supplies this compressed air A2 to the combustor 112. The combustor 112 mixes the compressed air A2 supplied from the compressor 110 with fuel F and burns it to produce combustion gas G1. The combustion gas G1 produced in the combustor 112 flows into the turbine 114 and drives the turbine 114. This drives the compressor 110 and the generator 104 connected to the turbine 114, and the generator 104 generates electricity. The combustion gas G1 that has passed through the turbine 114 is supplied to the boiler 106 as exhaust gas G2 of the gas turbine 102A.

[0041] The boiler 106 is configured to generate steam S using the heat from the exhaust gas G2 discharged from the gas turbine 102A. In the embodiment illustrated in Figure 8, the boiler 106 is a waste heat recovery boiler that generates steam S by evaporating boiler feedwater W through heat exchange with the exhaust gas G2. In the embodiment illustrated in Figure 8, the combustion equipment 100 further includes a steam turbine 118 driven by the steam S supplied from the boiler 106, which is connected to a generator 104 via a connecting shaft 116. Such a combustion equipment 100 is configured to recover the energy of the steam S by generating electricity using the steam S produced in the boiler 106. The steam S discharged from the steam turbine 118 is returned to water by a condenser 122 and used as boiler feedwater W.

[0042] The heating device 124 is configured to heat a plurality of first carriers 4 (including the second carrier 6 and the third carrier 30) using steam S generated in the boiler 106 as a heat source. In the embodiment illustrated in Figure 8, the heating device 124 is configured to extract a portion of the steam S supplied to the steam turbine 118 (hereinafter referred to as heat source steam Sh) and supply the heat source steam Sh to the CO2 removal device 1. Such a heating device 124 is, for example, a pipe that connects the steam line through which the steam S supplied to the steam turbine 118 flows to the CO2 removal device 1, and is configured to allow the heat source steam Sh to flow toward the CO2 removal device 1. Each of the plurality of first carriers 4 is heated indirectly without contact with the heat source steam Sh.

[0043] The CO2 recovery device 130 recovers CO2 from the combustion gas G1. In the embodiment illustrated in Figure 8, CO2 is recovered from the exhaust gas G2 of the gas turbine 102A, and gaseous CO2 (referred to as the first CO2 gas CG1) is discharged. The configuration of the CO2 recovery device 130 is not particularly limited, but for example, it may include an absorption tower that absorbs CO2 by bringing an absorbent liquid for CO2 absorption into contact with the exhaust gas G2, and a regeneration tower that heats the absorbent liquid that has absorbed CO2 in the absorption tower to separate and discharge the CO2.

[0044] The processing device 140 is configured to process the CO₂ recovered by the CO₂ recovery device 130 together with the CO₂ removed by the CO₂ removal device 1. In the form illustrated in FIG. 8, the combustion facility 100 includes a merging line 150 for merging gaseous CO₂ (referred to as the second CO₂ gas CG2) removed by the CO₂ removal device 1 into the first CO₂ gas CG1 supplied to the processing device 140. For this reason, the first CO₂ gas CG1 and the second CO₂ gas CG2 are supplied to the processing device 140. The processing device 140 is, for example, a compression device that compresses the first CO₂ gas CG1 and the second CO₂ gas CG2 to generate liquefied CO₂. The liquefied CO₂ generated by the processing device 140 is, for example, discharged underground.

[0045] According to the form illustrated in FIG. 8, by arranging the CO₂ removal device 1 upstream of the gas turbine 102A, air A can be circulated through the CO₂ removal device 1 by utilizing the intake air of the gas turbine 102A. For this reason, it is possible to dispense with providing an air circulation device such as a fan or a vacuum pump in the CO₂ removal device 1. Note that the combustion device 102 is not limited to the gas turbine 102A. The combustion device 102 may be a boiler or an incinerator provided with a ventilation device (for example, a fan) for ventilating intake air or exhaust air. The gas turbine 102A is suitable for installing the CO₂ removal device 1 as compared with other combustion devices such as a boiler or an incinerator, particularly in terms of a large ventilation volume.

[0046] Note that the form illustrated in FIG. 8 is a power generation facility to which a gas turbine combined cycle including a steam turbine 118 and a boiler 106 (heat recovery steam generator; HRSG) is applied for the combustion facility 100, but the present disclosure is not limited to this form. The combustion facility 100 may be a facility to which a simple cycle is applied in which the exhaust gas G2 directly flows from the turbine 114 to the CO₂ recovery device 130 without including the steam turbine 118 and the boiler 106.

[0047] According to the form illustrated in FIG. 8, since the heat source steam Sh is used as a heat source to heat the plurality of first carriers 4, it is possible to dispense with providing a heating device in the CO₂ removal device 1 that generates the heat energy required to heat the plurality of first carriers 4.

[0048] According to the embodiment illustrated in FIG. 8, by using the processing device 140, it is possible to dispense with providing a device for processing the second CO2 gas CG2 separately from this processing device 140 in the CO2 removal device 1.

[0049] Note that the present disclosure is not limited to the embodiment illustrated in FIG. 8 for the configuration of the combustion facility 100. FIG. 9 is a diagram schematically showing an example of the configuration of a combustion facility 100 different from FIG. 8. As illustrated in FIG. 9, the combustion facility 100 includes a CO2 removal device 1, a combustion device 102, a generator 104, a boiler 106, a steam turbine 118, a CO2 recovery device 130, a processing device 140, and a heater 160. Among the configurations of the combustion facility 100 illustrated in FIG. 9, those (CO2 removal device 1, combustion device 102, generator 104, boiler 106, steam turbine 118, CO2 recovery device 130, and processing device 140) that are the same as the configuration of the combustion facility 100 illustrated in FIG. 8 are denoted by the same reference numerals, and detailed descriptions thereof are omitted.

[0050] In the embodiment illustrated in FIG. 9, the combustion device 102 is an incinerator 102B (102). The incinerator 102B is arranged on the downstream side of the CO2 removal device 1 in the direction in which the combustion air of the combustion facility 100 flows so that the CO2-removed air A1 is introduced therein. The boiler 106 generates steam S by the heat of the exhaust gas Gx discharged from the incinerator 102B. The CO2 recovery device 130 recovers CO2 from the exhaust gas Gx of the incinerator 102B flowing from the boiler 106 toward the processing device 140, and discharges the first CO2 gas CG1.

[0051] The heater 160 heats the CO2-removed air A1. The incinerator 102B is introduced with the CO2-removed air A1 heated by the heater 160. In the embodiment illustrated in FIG., the heater 160 is an air preheater 160A (160), and heats the CO2-removed air A1 flowing toward the incinerator 10 by the heat of the exhaust gas Gx of the incinerator 102B flowing from the boiler 106 toward the CO2 recovery device 130.

[0052] In the embodiment illustrated in Figure 9, the combustion equipment 100 further includes a heated air line 162 for extracting a portion of the CO2-removed air A1 heated by the air preheater 160A and supplying it to the CO2 removal device 1. Such a heated air line 162 is, for example, a pipe connecting the air supply piping that connects the air preheater 160A and the incinerator 102B and the CO2 removal device 1.

[0053] According to the combustion equipment 100 illustrated in Figure 9, CO2-removed air A1 heated by the air preheater 160A is introduced into the incinerator 102B, thereby improving the combustion efficiency in the incinerator 102B. According to the combustion equipment 100 illustrated in Figure 9, a portion of the CO2-removed air A1 heated by the air preheater 160A is supplied to the CO2 removal device 1 via the heated air line 162. In other words, since the exhaust gas Gx from the incinerator 102B is used as a heat source to heat the multiple first carriers 4, it is not necessary to provide a heating device in the CO2 removal device 1 to generate the thermal energy required to heat the multiple first carriers 4.

[0054] The contents described in each of the above embodiments can be understood, for example, as follows:

[0055] [1] The CO2 removal device (1) according to the present disclosure is a CO2 removal device for removing CO2 from a gas (A), comprising: a cylindrical housing (2); a plate-shaped first carrier (4) disposed inside the housing, having an adsorbent (14) for adsorbing CO2 on its surface (12); and a plate-shaped second carrier (6) disposed inside the housing, having an adsorbent (14) for adsorbing CO2 on its surface (22), having a gas flow path (3) for circulating the gas between itself and the first carrier, wherein the first carrier includes at least one first projection (8) that protrudes toward the second carrier and extends within the gas flow path at a first angle (θ1) with respect to the extending direction (D1) of the housing, The second carrier includes at least one second protrusion (10) that protrudes toward the first carrier so as to contact the first protrusion, and extends within the gas flow path intersecting the direction in which the first protrusion extends, and at a second angle (θ2) different from the first angle with respect to the extending direction.

[0056] According to the configuration described in [1] above, the flow of gas in the gas channel is disrupted, promoting the transfer of CO2 from the gas to the adsorbent (hereinafter referred to as mass transfer), and this promotion of mass transfer improves the adsorption performance of CO2. Therefore, by reducing the volume of the first and second supports and thereby reducing the amount of water adsorbed on the first and second supports, the energy used to heat the first and second supports when heating the adsorbent to separate CO2 from the adsorbent can be reduced. As a result, the energy required to separate CO2 from the adsorbent can be suppressed.

[0057] [2] In some embodiments, in the configuration described in [1] above, the second carrier has the same shape as the first carrier.

[0058] According to the configuration described in [2] above, the second carrier can be manufactured in the same way as the first carrier, thus reducing the manufacturing cost of the CO2 removal device.

[0059] [3] In some embodiments, in the configuration described in [1] or [2] above, the first angle and the second angle are each 15 degrees or more and 60 degrees or less.

[0060] According to the configuration described in [3] above, the rigidity of each of the plate-shaped first support and the plate-shaped second support increases in the direction intersecting the extending direction of the housing, and the occurrence of deflection is suppressed. As a result, the cross-sectional area of ​​the gas flow path changes less irregularly, and the occurrence of regions in the gas flow path with a small amount of mass transfer is suppressed.

[0061] [4] In some embodiments, the configuration described in any one of [1] to [3] above further includes a plate-shaped third carrier (30) on which an adsorbent (14) for adsorbing CO2 is carried on a surface (32), the third carrier (30) is disposed in the housing on the opposite side of the second carrier with the first carrier in between, such that a second gas flow path (33) for circulating the gas is formed between the first carrier and the first carrier, the first carrier includes at least one opposite first projection (9) projecting toward the third carrier and extending along the second gas flow path at a third angle (θ3) with respect to the extending direction, the third carrier includes at least one third projection (34) projecting toward the first carrier so as to contact the opposite first projection, intersecting the direction in which the opposite first projection extends and extending along the second gas flow path at a fourth angle (θ4) different from the third angle with respect to the extending direction.

[0062] According to the configuration described in [4] above, multiple gas channels can be formed by stacking and arranging multiple carriers within the housing.

[0063] [5] The combustion equipment (100) relating to the present disclosure comprises a CO2 removal device (1) described in any one of [1] to [4] above, and a combustion device (102) configured to introduce the gas (A1) from which CO2 has been removed by the CO2 removal device.

[0064] According to the configuration described in [5] above, gas can be circulated to the CO2 removal device by utilizing the intake air to the combustion device. Therefore, it is not necessary to provide a separate device for circulating gas to the CO2 removal device.

[0065] [6] In some embodiments, the configuration described in [5] further comprises a boiler (106) configured to generate steam (S) by the heat of the combustion gas (G1) discharged from the combustion device, and a heating device (124) configured to heat the first carrier and the second carrier, respectively, using the steam generated in the boiler as a heat source.

[0066] According to the configuration described in [6] above, it is not necessary to provide a heating device that generates the thermal energy required to heat the first and second carriers.

[0067] [7] In some embodiments, the configuration described in [5] or [6] further comprises a CO2 recovery device (130) for recovering CO2 from combustion gas (G1) discharged from the combustion device, and a processing device (140) configured to process the CO2 (CG1) recovered by the CO2 recovery device together with the CO2 (CG2) removed by the CO2 removal device.

[0068] According to the configuration described in [7] above, by using the processing device, it is not necessary to provide a separate device for processing the CO2 removed by the CO2 removal device.

[0069] [8] In some embodiments, in the configuration described in any one of [5] to [7] above, the combustion device is a gas turbine (102A).

[0070] According to the configuration described in [8] above, the gas turbine has a much larger airflow compared to other combustion devices such as boilers and incinerators. Therefore, by utilizing the intake air to the gas turbine, the amount of CO2 removed can be increased.

[0071] [9] In some embodiments, the configuration described in any one of [5] to [8] above further comprises a heater (160) for heating the CO2-removed air (A1), which is the gas from which CO2 has been removed by the CO2 removal device, and the combustion device is configured to introduce the CO2-removed air heated by the heater.

[0072] According to the configuration described in [9] above, the combustion efficiency of the combustion device can be improved.

[0073]

[10] In some embodiments, in the configuration described in [9] above, the heater is an air preheater (160A) that heats the CO2-removed air with exhaust gas (Gx) discharged from the combustion device, and further includes a heated air line (162) for extracting a portion of the CO2-removed air heated by the heater and supplying it to the CO2 removal device 1.

[0074] According to the configuration described in

[10] above, it is not necessary to provide a heating device that generates the thermal energy required to heat the first and second carriers.

[0075] 1 CO2 removal device 2 Housing 2a Inlet 2b Outlet 3 Gas flow path 4 First carrier 6 Second carrier 8 First protrusion 8a Ridge 8b Convex surface 9 Opposite side first protrusion 9a Ridge 9b Concave surface 10 Second protrusion 10a Ridge 10b Convex surface 11 Opposite side second protrusion 11a Ridge 11b Concave surface 12 Surface of first carrier 14 Adsorbent 22 Surface of second carrier 30 Third carrier 32 Surface of third carrier 33 Second gas flow path 34 Third protrusion 34a Ridge 36 Opposite side third protrusion 100 Combustion equipment 102 Combustion device 102A Gas turbine 104 Generator 106 Boiler 110 Combustor 112 Combustor 114 Turbine 116 Connecting shaft 118 Steam turbine 122 Condenser 124 Heating device 130 Recovery device 140 Treatment device 150 Confluence line 160 Heater 160A Air preheater 162 Heated air line A Air A1 CO2-removed air A2 Compressed air CG1 First CO2 gas CG2 Second CO2 gas CW Condensed water D1 Extension direction D2 Height direction D3 Width direction F Fuel G1 Combustion gas G2 Exhaust gas K Total CO2 adsorption rate of adsorbent Kf Mass transfer coefficient L1 First virtual line L2 Second virtual line L3 Third virtual line L4 Fourth virtual line L5 Fifth virtual line Ld Extension line S Steam Sh Steam for heat source W Boiler feedwater

Claims

1. A CO2 removal device for removing CO2 from a gas, comprising: a cylindrical housing; a plate-shaped first carrier having an adsorbent for adsorbing CO2 on its surface, the first carrier being disposed within the housing; and a plate-shaped second carrier having an adsorbent for adsorbing CO2 on its surface, the second carrier being disposed within the housing such that a gas flow path is formed between it and the first carrier for circulating the gas, wherein the first carrier includes at least one first projection that protrudes toward the second carrier and extends within the gas flow path at a first angle inclined with respect to the extending direction of the housing; and the second carrier includes at least one second projection that protrudes toward the first carrier so as to contact the first projection and extends within the gas flow path at a second angle different from the first angle in the extending direction, intersecting the direction in which the first projection extends.

2. The CO2 removal apparatus according to claim 1, wherein the second carrier has the same shape as the first carrier.

3. The CO2 removal device according to claim 1 or 2, wherein each of the first angle and the second angle is 15 degrees or more and 60 degrees or less.

4. A CO2 removal device according to claim 1 or 2, further comprising a plate-shaped third carrier having an adsorbent for adsorbing CO2 on its surface, the third carrier being positioned in the housing on the opposite side of the second carrier with the first carrier in between, such that a second gas flow path for circulating the gas is formed between the first carrier and the third carrier, the first carrier including at least one opposite first projection that protrudes toward the third carrier and extends within the second gas flow path at a third angle with respect to the extending direction, and the third carrier including at least one third projection that protrudes toward the first carrier so as to contact the opposite first projection and extends within the second gas flow path at a fourth angle different from the third angle with respect to the extending direction, intersecting the direction in which the opposite first projection extends.

5. A combustion apparatus comprising a CO2 removal device according to claim 1 or 2, and a combustion device configured to introduce the gas from which CO2 has been removed by the CO2 removal device.

6. The combustion apparatus according to claim 5, further comprising: a boiler configured to generate steam by the heat of combustion gas discharged from the combustion apparatus; and a heating device configured to heat the first carrier and the second carrier, respectively, using the steam generated in the boiler as a heat source.

7. The combustion apparatus according to claim 5, further comprising: a CO2 recovery device for recovering CO2 from combustion gas discharged from the combustion device; and a processing device configured to process the CO2 recovered by the CO2 recovery device together with the CO2 removed by the CO2 removal device.

8. The combustion apparatus according to claim 5, wherein the combustion device is a gas turbine.

9. The combustion apparatus according to claim 5, further comprising a heater for heating the CO2-removed air, which is the gas from which CO2 has been removed by the CO2 removal device, wherein the combustion device is configured to introduce the CO2-removed air heated by the heater.

10. The combustion apparatus according to claim 9, wherein the heater is an air preheater that heats the CO2-removed air with exhaust gas discharged from the combustion apparatus, and further includes a heated air line for extracting a portion of the CO2-removed air heated by the heater and supplying it to the CO2 removal device 1.

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