Flow passage formation plate, gas adsorption unit, and gas adsorption device

Abstract

This flow path formation plate is used for forming a flow path of a gas adsorption unit, and comprises: a porous plate having a plurality of hole parts extending in the plate thickness direction; and a gas adsorbent disposed so as to fill the inside of each hole part. The porous plate is formed of a material having a thermal conductivity higher than the thermal conductivity of the gas adsorbent.

Description

Flow path forming plate, gas adsorption unit, and gas adsorption device

[0001] This application claims priority to Japanese Patent Application No. 2023-108882, filed on June 30, 2023, the contents of which are incorporated herein by reference.

[0002] For example, various gas adsorption devices have been proposed to selectively recover carbon dioxide and the like from gas. Patent Document 1 below discloses a gas adsorption device including a heat transfer tube through which a heat medium flows and a granular adsorbent packed around the heat transfer tube. For example, when adsorbing carbon dioxide from gas, an adsorbent obtained by impregnating a porous material or a resin with an amine is preferably used. It is believed that carbon dioxide in the gas can be adsorbed and desorbed onto the adsorbent by flowing the gas through the gas adsorption device while adjusting the temperature of the adsorbent using the heat of the heat medium.

[0003] U.S. Pat. No. 9,751,039

[0004] However, the technology disclosed in Patent Document 1 has a problem in that heat is not efficiently transferred to the adsorbent in an area away from the heat transfer tube, making it difficult to control the temperature. As a result, the adsorption performance of the adsorbent cannot be fully utilized, and the efficiency of the gas adsorption device decreases.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a flow path forming plate, a gas adsorption unit, and a gas adsorption device that are capable of adsorbing and desorbing target components with higher efficiency.

[0006] In order to solve the above problems, the flow path forming plate of the present disclosure is a flow path forming plate used to form a flow path of a gas adsorption unit, and comprises a perforated plate having a plurality of holes extending in the plate thickness direction, and a gas adsorbent arranged so as to fill the inside of each of the holes, and the perforated plate is formed from a material having a thermal conductivity higher than that of the gas adsorbent.

[0007] The gas adsorption unit according to the present disclosure comprises a plurality of flow path forming plates that are arranged at intervals in the plate thickness direction to form the flow path therebetween, and a casing that holds the plurality of flow path forming plates from the outside.

[0008] The gas adsorption device according to the present disclosure includes a gas supply flow path through which a gas containing a component to be adsorbed flows, a gas adsorption unit provided on the gas supply flow path, and a temperature adjustment unit provided adjacent to the gas adsorption unit for adjusting the temperature of the adsorbent.

[0009] According to the present disclosure, it is possible to provide a flow path forming plate, a gas adsorption unit, and a gas adsorption device that are capable of adsorbing and desorbing target components with higher efficiency.

[0010] Fig. 1 is a cross-sectional view showing the configuration of a gas adsorption device according to an embodiment of the present disclosure; Fig. 2 is a front view showing the configuration of a gas adsorption unit according to an embodiment of the present disclosure; Fig. 3 is a plan view showing the configuration of a flow path forming plate according to an embodiment of the present disclosure; Fig. 4 is a cross-sectional view showing the configuration of a flow path forming plate according to an embodiment of the present disclosure; Fig. 5 is a cross-sectional view showing a modified example of a flow path forming plate according to an embodiment of the present disclosure.

[0011] (Configuration of Gas Adsorption Device 1) Hereinafter, a gas adsorption device 1, a gas adsorption unit 10, and a flow path forming plate 11 according to a first embodiment of the present disclosure will be described with reference to FIGS. 1 to 4. FIG.

[0012] The gas adsorption device 1 is installed on the exhaust line of, for example, a gas turbine combined cycle plant (GTCC) and is used to adsorb and remove carbon dioxide contained in the exhaust gas. As shown in Fig. 1, the gas adsorption device 1 includes a gas supply flow path 2, a gas adsorption unit 10, and a temperature control unit 3.

[0013] The gas supply flow path 2 is a pipe through which gas containing components to be adsorbed, such as the exhaust gas described above, flows. A gas adsorption unit 10 is provided on the gas supply flow path 2. The detailed configuration of the gas adsorption unit 10 will be described later. The gas adsorption unit 10 adsorbs and removes gas components to be adsorbed, such as carbon dioxide, from the exhaust gas. Therefore, gas with a lower carbon dioxide concentration flows downstream of the gas adsorption unit 10 in the gas supply flow path 2 than upstream. A temperature adjustment unit 3 is provided adjacent to the gas adsorption unit 10. The temperature adjustment unit 3 is, for example, an electric heater or a ceramic heater. The temperature adjustment unit 3 adjusts the temperature of the gas adsorbent 42 in the gas adsorption unit 10, thereby promoting the processes of gas adsorption and desorption by the gas adsorbent 42. Note that when the gas flowing through the gas supply flow path 2 is at a high temperature, the temperature of the gas adsorbent 42 can be adjusted by the heat of the gas itself, without using the temperature adjustment unit 3.

[0014] (Configuration of Gas Adsorption Unit 10) As shown in FIG. 2 , the gas adsorption unit 10 includes a plurality of flow path forming plates 11 and a casing 13 that supports the flow path forming plates 11 from the outside. The gas adsorption unit 10 also includes a plurality of flow paths F extending in the gas flow direction D. These flow paths F are defined by a plurality of flow path forming plates 11. The flow path forming plates 11 are plate-shaped and extend in the gas flow direction D. A plurality of flow path forming plates 11 are arranged at intervals in the plate thickness direction. Another wave-shaped flow path forming plate 11 (referred to as a curved plate 12) is arranged between a pair of flow path forming plates 11 adjacent in the plate thickness direction. The curved plate 12 is curved so that both sides in the plate thickness direction are uneven, and the tops of the convex portions are in contact with and fixed to one of the adjacent flow path forming plates 11. When viewed from the gas flow direction D, the angle formed by the curved plate 12 and the flow path forming plate 11 is, for example, less than 90°. That is, the flow path F has a triangular cross section when viewed from the gas flow direction D. The angle formed by the curved plate 12 and the flow path forming plate 11 may be 90° or more.

[0015] (Configuration of Flow Channel Plate 11) As shown in FIG. 3 , the flow channel plate 11 includes a perforated plate 41 and a gas adsorbent 42. The perforated plate 41 is made of a material with a thermal conductivity higher than that of the gas adsorbent 42. The perforated plate 41 has a higher rigidity than the gas adsorbent 42. The perforated plate 41 is, for example, a metal lath, which is a plate-like material integrally formed from a metal material and has a plurality of holes 50 extending in the thickness direction. For example, the holes 50 are rhombic in plan view and are arranged regularly or irregularly at intervals in the in-plane direction. The planar shape of the holes 50 may be circular, rectangular, or another polygonal shape. The interior of each hole 50 is filled with a gas adsorbent 42. For example, when carbon dioxide is to be adsorbed, the gas adsorbent 42 may be an amine-based substance supported on a porous material, zeolite, a metal organic framework, or the like. As shown in FIG. 4, the gas adsorbent 42 is filled only in the holes 50, and when viewed in cross section, both sides of the perforated plate 41 in the plate thickness direction are exposed to the outside (flow path F).

[0016] (Operation and Effect) When operating the gas adsorption device 1, first, gas is circulated through the gas supply flow path 2. The temperature of the gas adsorbent 42 may be lowered as necessary. This initiates adsorption of the target gas component, such as carbon dioxide, by the gas adsorbent 42. When the adsorption capacity of the gas adsorbent 42 decreases, the temperature of the gas adsorbent 42 is increased by the temperature control unit 3, carbon dioxide is desorbed from the gas adsorbent 42, and the temperature of the gas adsorbent 42 is then lowered. It is desirable that the gas flow path during desorption be configured to be different from the gas flow path during adsorption, so that it can be switched using a damper or the like. By repeating this cycle, gas adsorption and desorption are performed over the long term. The pressure inside the device may be reduced when desorbing carbon dioxide (the adsorbed component). Furthermore, for cooling during adsorption, low-temperature gas may be circulated, or a low-temperature substance may be heat-exchanged between the gas adsorbent 42 and the temperature control unit 3. Additionally, the adsorption and desorption process may be switched by rotating or moving the gas adsorbent 42 itself. In order to lower the gas temperature during adsorption, a cooling mechanism or the like may be provided on the upstream side of the device.

[0017] Here, various gas adsorption devices 1 have been proposed to selectively recover carbon dioxide and the like from gas. One example is a device that includes a heat transfer tube through which a heat medium flows and a granular adsorbent packed around the heat transfer tube. It has been said that carbon dioxide in the gas can be adsorbed by the adsorbent by flowing the gas through the device while adjusting the temperature of the adsorbent using the heat of the heat medium.

[0018] However, in the conventional technology, heat is not efficiently transferred to the adsorbent in an area away from the heat transfer tube, making temperature control difficult. As a result, the adsorption performance of the adsorbent cannot be fully utilized, and the efficiency of the gas adsorption device 1 decreases. Therefore, the present embodiment employs the above-described configurations.

[0019] According to the above configuration, the gas adsorbent 42 is provided so as to fill the holes 50 of the perforated plate 41. Specifically, the gas adsorbent 42 in the holes 50 and the perforated plate 41, which is a thermally conductive material, are disposed in close proximity to each other. Therefore, when the gas adsorbent 42 is heated through the perforated plate 41, heat can be efficiently transferred to the gas adsorbent 42. This reduces temperature variations in the gas adsorbent 42, allowing gas adsorption and desorption to proceed more quickly and stably. Furthermore, since the perforated plate 41 is made of a metal material, the strength and rigidity of the gas adsorbent 42 can be supplemented by the perforated plate 41. This further increases the strength of the flow path forming plate 11.

[0020] Furthermore, with the above-described configuration, since metal lath, which is a porous metal body that is easily available, is used as the perforated plate 41, the flow path forming plate 11 can be produced more cheaply and easily, thereby reducing the maintenance costs and manufacturing costs of the entire device.

[0021] Furthermore, with the above-described configuration, since the perforated plate 41 is exposed to the outside on both sides in the plate thickness direction, when, for example, the heat of the gas flowing through the flow path F or the temperature of the gas adsorbent 42 is adjusted by the temperature adjustment unit 3, the heat is easily transferred to the perforated plate 41 when the gas comes into contact with the perforated plate 41. Alternatively, heat from the temperature adjustment unit 3 is easily transferred to the entire perforated plate 41. This allows for stable temperature adjustment of the gas adsorbent 42 with higher responsiveness. Furthermore, by filling the holes 50 of the metal lath with the gas adsorbent 42, the gas adsorbent 42 can be more firmly and stably held within the holes 50. This allows for stable use of the flow path forming plate 11 over a long period of time.

[0022] In addition, with the above configuration, the flow path F is formed by arranging a plurality of flow path forming plates 11 at intervals, and these flow path forming plates 11 can be held by the casing 13. This allows each gas adsorption unit 10 to be easily transported and installed. In other words, by modularizing the gas adsorption unit 10, it can be easily detached or replaced when it reaches the end of its life. This allows maintenance work and construction work at the plant to be carried out efficiently in a shorter period of time.

[0023] Furthermore, with the above configuration, since the other flow path forming plate 11 curved in a corrugated shape is interposed between the pair of flow path forming plates 11, the strength between the plate-like flow path forming plates 11 is ensured, and the cross-sectional shape of the flow path F can be maintained more stably. In addition, the surface area of ​​the gas adsorbent 42 in the flow path F is also increased, making it possible to more efficiently promote gas adsorption. Furthermore, by bringing the other corrugated flow path forming plate 11 (curved plate 12) into contact with the flat flow path forming plate 11, heat is transferred three-dimensionally, improving heating efficiency.

[0024] Furthermore, with the above configuration, the flow path F is configured so that the gas flows along the surface direction of the perforated plate 41, and therefore, compared to, for example, a case in which the gas flows from a direction opposite to the perforated plate 41, the flow path F is less likely to be clogged due to foreign matter such as dust contained in the gas being captured by the gas adsorbent 42. This makes it possible to continue using the gas adsorption unit 10 stably for a longer period of time.

[0025] Therefore, with the above configuration, it is possible to provide a gas adsorption device 1 that can perform gas adsorption stably for a longer period of time.

[0026] (Other Embodiments) Although the embodiments of the present disclosure have been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like within the scope that does not deviate from the gist of the present disclosure are also included.

[0027] For example, in the above embodiment, an example has been described in which both sides of the perforated plate 41 of the flow path forming plate 11 in the plate thickness direction are exposed to the outside. However, as a modified example, as shown in Fig. 5, it is also possible to provide more layers of gas adsorbent 42 so as to cover part or all of both sides in the plate thickness direction. With this configuration, the effective area of ​​the gas adsorbent 42 is increased, and therefore it is possible for a larger amount of target components to be adsorbed by the gas adsorbent 42.

[0028] Furthermore, the temperature control unit 3 may be configured to use an electric heater, a ceramic heater, or a configuration in which Joule heat is generated by internal resistance by directly supplying current to the porous plate 41 to heat the gas adsorbent 42. Even in this case, the same effects as those described above can be obtained.

[0029] Furthermore, the form of the perforated plate 41 is not limited to metal lath, and a mesh or wire netting may also be suitably used as long as it is a thin, porous metal body having a large number of holes 50. With this configuration, the same effects as those described above can be obtained.

[0030] <Additional Notes> The flow path forming plate 11, the gas adsorption unit 10, and the gas adsorption device 1 described in each embodiment can be understood, for example, as follows.

[0031] (1) The flow path forming plate 11 according to the first aspect is a flow path forming plate 11 used to form a flow path F of a gas adsorption unit 10, and comprises a porous plate 41 having a plurality of holes 50 extending in the plate thickness direction, and a gas adsorbent 42 arranged so as to fill the inside of each of the holes 50, and the porous plate 41 is formed from a material having a thermal conductivity higher than that of the gas adsorbent 42.

[0032] According to the above configuration, the gas adsorbent 42 is provided so as to fill the holes 50 of the perforated plate 41, and therefore, when the gas adsorbent 42 is heated through the perforated plate 41, heat can be efficiently transferred to the gas adsorbent 42. This reduces unevenness in the temperature of the gas adsorbent 42, and allows gas adsorption and desorption to proceed more stably.

[0033] (2) A flow path forming plate 11 according to a second aspect is the flow path forming plate 11 of (1), in which the porous plate 41 has higher rigidity than the gas adsorbent 42 .

[0034] According to the above-described configuration, the rigidity of the entire flow passage forming plate 11 can be increased by the perforated plate 41 .

[0035] (3) The flow path forming plate 11 according to a third aspect is the flow path forming plate 11 of (1) or (2), in which the porous plate 41 is a metal lath.

[0036] According to the above configuration, since metal lath, which is easily available, is used as the perforated plate 41, the flow path forming plate 11 can be produced more inexpensively, which makes it possible to reduce the maintenance costs and manufacturing costs of the entire device.

[0037] (4) The flow path forming plate 11 according to the fourth aspect is the flow path forming plate 11 according to any one of aspects (1) to (3), in which the perforated plate 41 is exposed to the outside on both sides in the plate thickness direction.

[0038] According to the above configuration, since the perforated plate 41 is exposed to the outside on both sides in the plate thickness direction, when adjusting the temperature of the gas adsorbent 42 using the heat of the gas flowing through the flow path F, for example, the heat is easily transferred to the perforated plate 41 when the gas comes into contact with the perforated plate 41. This allows for stable temperature adjustment of the gas adsorbent 42 with higher responsiveness. Furthermore, by filling the holes 50 of the metal lath with the gas adsorbent 42, the gas adsorbent 42 can be more firmly and stably held within the holes 50. This allows for stable use of the flow path forming plate 11 over a long period of time.

[0039] (5) The flow path forming plate 11 according to the fifth aspect is the flow path forming plate 11 according to any one of the aspects (1) to (3), and the gas adsorbent 42 is further provided on both sides of the perforated plate 41 in the plate thickness direction when viewed in cross section along the plate thickness direction.

[0040] According to the above configuration, gas adsorbent 42 is further provided on both sides of perforated plate 41 in the plate thickness direction so as to cover perforated plate 41. This increases the effective area of ​​gas adsorbent 42, making it possible for more target components to be adsorbed by gas adsorbent 42.

[0041] (6) The gas adsorption unit 10 according to the sixth aspect comprises a plurality of flow path forming plates 11 according to any one of aspects (1) to (5) arranged at intervals in the plate thickness direction to form the flow path F therebetween, and a casing 13 that holds the plurality of flow path forming plates 11 from the outside.

[0042] According to the above configuration, the flow path F is formed by arranging a plurality of flow path forming plates 11 at intervals, and these flow path forming plates 11 can be held by the casing 13. This allows each gas adsorption unit 10 to be easily transported and installed. This makes it possible to efficiently carry out maintenance work and construction work at the plant in a short period of time.

[0043] (7) A gas adsorption unit 10 according to a seventh aspect is the gas adsorption unit 10 of (6), further comprising another flow path forming plate 11 that is provided between a pair of flow path forming plates 11 adjacent to each other in the thickness direction, that is curved to have projections and recesses in the thickness direction, and whose tops are in contact with one of the pair of flow path forming plates 11.

[0044] According to the above configuration, the other flow path forming plate 11 curved in a corrugated shape is interposed between the pair of flow path forming plates 11, so that the cross-sectional shape of the flow path F can be maintained more stably. In addition, the surface area of ​​the gas adsorbent 42 in the flow path F is increased, so that gas adsorption can proceed more efficiently. Furthermore, by bringing the other corrugated flow path forming plate 11 into contact with the flat flow path forming plate 11, heat is transferred three-dimensionally, and heating efficiency can also be improved.

[0045] (8) The gas adsorption unit 10 according to the eighth aspect is the gas adsorption unit 10 of (6) or (7), and is configured such that gas flows in the flow path F along the surface direction of the porous plate 41.

[0046] According to the above configuration, the flow path F is configured so that the gas flows along the surface direction of the perforated plate 41, and therefore, compared to, for example, a case where the gas flows from a direction opposite to the perforated plate 41, the flow path F is less likely to be clogged due to foreign matter such as dust contained in the gas being captured by the gas adsorbent 42. This makes it possible to continue using the gas adsorption unit 10 stably for a longer period of time.

[0047] (9) A gas adsorption device 1 according to a ninth aspect includes a gas supply flow path 2 through which a gas containing a component to be adsorbed flows, a gas adsorption unit 10 according to any one of aspects (6) to (8) provided on the gas supply flow path 2, and a temperature control unit 3 provided adjacent to the gas adsorption unit 10 and controlling the temperature of the gas adsorbent 42.

[0048] According to the above configuration, it is possible to provide the gas adsorption device 1 that can perform gas adsorption / desorption stably for a longer period of time.

[0049] According to the present invention, it is possible to provide a flow path forming plate, a gas adsorption unit, and a gas adsorption device that are capable of adsorbing and desorbing target components with higher efficiency.

[0050] REFERENCE SIGNS LIST 1...gas adsorption device 2...gas supply flow path 3...temperature control section 10...gas adsorption unit 11...flow path forming plate 12...curved plate 13...casing 41...perforated plate 42...gas adsorbent 50...holes D...gas flow direction F...flow path

Claims

1. A flow path forming plate used to form a flow path in a gas adsorption unit, comprising: a perforated plate having a plurality of holes extending in a plate thickness direction; and a gas adsorbent arranged so as to fill the inside of each of the holes, wherein the perforated plate is formed from a material having a thermal conductivity higher than that of the gas adsorbent.

2. The flow path forming plate according to claim 1, wherein the porous plate has a rigidity higher than that of the gas adsorbent.

3. A flow passage forming plate according to claim 1 or 2, wherein the porous plate is a metal lath.

4. A flow passage forming plate according to claim 1 or 2, wherein the porous plate is exposed to the outside on both sides in the plate thickness direction.

5. A flow path forming plate according to claim 1 or 2, wherein the gas adsorbent is further provided on both sides of the porous plate in the plate thickness direction when viewed in a cross section along the plate thickness direction.

6. A gas adsorption unit comprising: a plurality of flow path forming plates as described in claim 1 that are arranged at intervals in the plate thickness direction to form the flow path therebetween; and a casing that holds the plurality of flow path forming plates from the outside.

7. A gas adsorption unit as described in claim 6, further comprising another flow path forming plate disposed between a pair of flow path forming plates adjacent to each other in the plate thickness direction, curved so as to have projections and recesses in the plate thickness direction, and the tops of the projections abutting against one of the pair of flow path forming plates.

8. The gas adsorption unit according to claim 6 or 7, wherein the gas flows through the flow passage along the surface direction of the porous plate.

9. A gas adsorption device comprising: a gas supply flow path through which a gas containing a component to be adsorbed flows; a gas adsorption unit according to claim 6 or 7 provided on the gas supply flow path; and a temperature adjustment unit provided adjacent to the gas adsorption unit for adjusting the temperature of the gas adsorbent.

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