Gas treatment system

Abstract

The gas treatment system is provided with a plurality of gas separation systems, each of which has a separation membrane module, and which is provided with a separation membrane that selectively permeates CO2 and separates CO2 from combustion exhaust gas, a first outlet through which first permeated gas that permeates the separation membrane flows out, and a second outlet through which non-permeated gas that does not permeate the separation membrane flows out. The gas treatment system is further provided with a fifth flow path connected to the third flow path and connecting the plurality of gas separation systems to each other, and when the separation membrane module of at least a first gas separation system is cleaned, the second flow path is opened by the first switching unit and the third flow path is opened by the second switching unit in the first gas separation system. In the at least second gas separation system, the first flow path is opened by the first switching unit, and the third flow path is opened by the second switching unit, and the impermeable gas from the at least second gas separation system flows through the fifth flow path to the third flow path of the first gas separation system and the separation membrane module.

Description

Technical Field

[0001] The present disclosure relates to a gas processing system. Background Art

[0002] A gas treatment system is known that supplies a gas containing CO2 to a separation membrane module and separates the CO2 from the supplied gas. For example, Patent Document 1 discloses a gas separation system that cleans the separation membrane module by passing the supplied gas through the separation membrane module to remove impurities attached to the separation membrane.

[0003] In the gas separation system disclosed in Patent Document 1, the permeated gas separated by the separation membrane of one of two gas separation systems each including a separation membrane module is supplied to the other gas separation system, thereby removing impurities adhering to the separation membrane of the other gas separation system along with the permeated gas.

[0004] <Prior Art Literature>

[0005] <Patent Document>

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2019-48276 Summary of the Invention

[0007] <Problems to be Solved by the Invention>

[0008] In the gas separation system disclosed in Patent Document 1, low-pressure permeate gas passing through one separation membrane is used to remove impurities adhering to the other separation membrane. Therefore, there is room for improvement in the cleaning function of the separation membrane module. Furthermore, a simplified structure for cleaning the separation membrane module is sought.

[0009] The present disclosure provides a gas processing system which simplifies the structure for cleaning the separation membrane module while ensuring the cleaning function of the separation membrane module.

[0010] <Methods used to solve the problem>

[0011] In a first embodiment, a gas treatment system is provided, comprising a plurality of gas separation systems, each of the plurality of gas separation systems comprising a separation membrane module, comprising a separation membrane that selectively permeates CO2 and separates CO2 from combustion exhaust gas, an inlet for the combustion exhaust gas to flow in, a first outlet for the first permeated gas that has permeated the separation membrane and is contained in the combustion exhaust gas flowing in from the inlet to flow out, and a second outlet for the non-permeated gas that has not permeated the separation membrane and is contained in the combustion exhaust gas to flow out; a first flow path connected to the inlet; a first switching portion provided in the first flow path; a second flow path branched from the first flow path via the first switching portion; a third flow path connected to the second outlet; a second switching portion provided in the third flow path; and a fourth flow path branched from the first flow path via the second switching portion. The part branches off from the third flow path, and the gas treatment system further includes a fifth flow path connected to the third flow path and connecting the multiple gas separation systems to each other. When cleaning the separation membrane module possessed by at least a first gas separation system among the multiple gas separation systems, in the first gas separation system, the second flow path is opened by the first switching part, and the third flow path is opened by the second switching part. In at least a second gas separation system, the first flow path is opened by the first switching part, and the third flow path is opened by the second switching part. The non-permeable gas from at least the second gas separation system flows to the third flow path and the separation membrane module possessed by the first gas separation system via the fifth flow path.

[0012] In the second scheme, a gas treatment system is provided, comprising: a separation membrane module, comprising a separation membrane that selectively permeates CO2 and separates CO2 from combustion exhaust gas, an inlet for the combustion exhaust gas to flow in, a first outlet for the permeated gas in the combustion exhaust gas that has permeated the separation membrane to flow out, and a second outlet for the non-permeated gas in the combustion exhaust gas that has not permeated the separation membrane to flow out; a first flow path connected to the inlet; a fifth switching portion arranged in the first flow path; a twelfth flow path branched from the first flow path via the fifth switching portion; a thirteenth flow path connected to the second outlet and connected to the atmospheric environment; and a fourth decompression unit connected to the twelfth flow path, and when the separation membrane module is cleaned, the twelfth flow path is opened through the fifth switching portion, and the atmosphere is introduced into the separation membrane module via the thirteenth flow path.

[0013] <Effects of the Invention>

[0014] According to the technology disclosed herein, it is possible to provide a gas processing system that simplifies the structure for cleaning the separation membrane module while ensuring the cleaning function of the separation membrane module. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram showing an example of the overall configuration of the gas treatment system according to the first embodiment.

[0016] Figure 2 This is a schematic cross-sectional view showing a configuration example of a separation membrane module of the gas treatment system according to the first embodiment.

[0017] Figure 3 This is a block diagram showing a configuration example of a control unit of the gas treatment system according to the first embodiment.

[0018] Figure 4 These are diagrams for explaining the CO 2 separation operation of the separation membrane module in the gas treatment system according to the first embodiment.

[0019] Figure 5 These are diagrams for explaining the cleaning operation of the separation membrane module in the gas treatment system according to the first embodiment.

[0020] Figure 6 This is a schematic diagram showing an example of the overall configuration of a gas treatment system according to a modified example of the first embodiment.

[0021] Figure 7 These are diagrams for explaining the CO 2 separation operation of the auxiliary separation membrane module in the gas treatment system according to the modified example of the first embodiment.

[0022] Figure 8 These are diagrams for explaining the cleaning operation of the auxiliary separation membrane module in the gas treatment system according to the modified example of the first embodiment.

[0023] Figure 9 This is a schematic diagram showing an example of the overall configuration of a gas treatment system according to the second embodiment.

[0024] Figure 10 This is a diagram for explaining the CO 2 separation operation of the separation membrane module in the gas treatment system according to the second embodiment.

[0025] Figure 11 It is a diagram for explaining the cleaning operation of the separation membrane module in the gas treatment system according to the second embodiment.

[0026] Explanation of symbols

[0027] 1. 1A gas treatment system

[0028] 10 separation membrane modules

[0029] 11First separation membrane module

[0030] 12 Second separation membrane module

[0031] 13Third separation membrane module

[0032] 10S auxiliary separation membrane module

[0033] 14Fourth separation membrane module

[0034] 15Fifth separation membrane module

[0035] 21, 22a, 22b, 22c, 22d, 22e, 22f, 22g, 22m, 22h, 23a, 23b, 23c, 23d, 23e, 23f, 23g, 23m, 23h, 24a, 24b, 24c, 24d, 24e, 24f, 24g, 24m, 24h, 25a, 25b, 25c, 26a, 26b, 26c, 26d, 27a, 28a-1, 28a-2, 28d, 28e, 28f, 28g, 28h, 29a-1, 29a-2, 29d, 29e, 29f, 29g, 29h pipeline

[0036] 31a, 31b, 31c, 31d, 31e, 31f, 31g, 31h, 31i, 31j, 31k, 31m, 31n, 31p, 31q three-way valve

[0037] 41a, 41b, 41c measuring parts

[0038] 51 (51a, 51b) compressor

[0039] 57a blower

[0040] 51c, 52, 53, 55, 57b, 57c vacuum pumps

[0041] 60 Control Department

[0042] 110 separation membrane

[0043] 121 inlet

[0044] 122 First Flow Outlet

[0045] 123 Second flow outlet DETAILED DESCRIPTION

[0046] Hereinafter, an example of a gas treatment system according to an embodiment will be described with reference to the accompanying drawings. The term "connected" as used herein is not limited to a case where one component A is directly connected to another component B, but also includes a case where components A and B are connected via one or more other components.

[0047] [First embodiment]

[0048] <Overall composition>

[0049] Reference Figures 1 to 3 , a configuration example of the gas treatment system 1 according to the first embodiment will be described. Figure 1 1 is a schematic diagram illustrating an example of the overall configuration of the gas treatment system 1 according to the first embodiment. Figure 2 This is a schematic cross-sectional view showing a configuration example of a separation membrane module of the gas treatment system 1 according to the first embodiment. Figure 3 This is a block diagram showing a configuration example of a control unit of the gas treatment system 1 according to the first embodiment.

[0050] The gas treatment system 1 treats combustion exhaust gas containing CO2. For example, the gas treatment system 1 treats combustion exhaust gas emitted from a ship's engine 100E. However, the combustion exhaust gas treated by the gas treatment system 1 is not limited to combustion exhaust gas emitted from a ship's engine 100E. For example, the gas treatment system 1 can treat combustion exhaust gas containing CO2 emitted from fossil fuel-burning combustion equipment, such as boilers in coal-fired power plants. It should be noted that the ship's engine 100E is one example of a "supply source of combustion exhaust gas."

[0051] The combustion exhaust gas contains impurities such as coal dust. Figure 2 The separation membrane 110 described separately is partially or completely blocked. When impurities from the combustion exhaust gas adhere to the separation membrane 110 and block the separation membrane 110, the CO2 permeation function of the separation membrane 110 is reduced. Here, the "blockage" in this specification is not limited to the case where the flow of gas flowing out of or into the separation membrane 110 is blocked by impurities attached to the separation membrane 110, but also includes the case where the flow of gas flowing out of or into the separation membrane 110 remains although the CO2 permeation function at the separation membrane 110 is reduced. It should be noted that as a term indicating the blockage of the separation membrane 110, the term "blockage of the separation membrane module equipped with the separation membrane 110" is sometimes used. It should be noted that impurities are not limited to coal dust.

[0052] The gas treatment system 1 includes multiple gas separation systems and a flow path (a fifth flow path described separately) connecting the multiple gas separation systems. Furthermore, each of the multiple gas separation systems includes a separation membrane module, a flow path (a first flow path, a second flow path, a third flow path, and a fourth flow path described separately), and a switching unit (a first switching unit, a second switching unit, and multiple switching units described separately). Furthermore, the gas treatment system 1 may also include other components such as a measuring unit for measuring at least one of the pressure, flow rate, and concentration of the gas flowing through the flow path, a compressor 51, and a control unit 60. Furthermore, the gas treatment system 1 may also include a storage tank for recovering the CO2 separated by the separation membrane module.

[0053] exist Figure 1 In the example shown, examples of the separation membrane modules included in each of the multiple gas separation systems include a first separation membrane module 11, a second separation membrane module 12, and a third separation membrane module 13. However, the number of separation membrane modules included in the gas treatment system 1 is not limited to three. At least two separation membrane modules may be provided in the gas treatment system 1. The first separation membrane module may be the first separation membrane module 11. However, the first separation membrane module is not limited to the first separation membrane module 11. A gas separation system including the first separation membrane module is sometimes referred to as the "first gas separation system." The second separation membrane module may be the second separation membrane module 12. However, the second separation membrane module is not limited to the second separation membrane module 12. A gas separation system including the second separation membrane module is sometimes referred to as the "second gas separation system." The third separation membrane module may be the third separation membrane module 13. However, the third separation membrane module is not limited to the third separation membrane module 13. A gas separation system including the third separation membrane module is sometimes referred to as the "third gas separation system." In addition, when the first separation membrane module 11 to the third separation membrane module 13 are described without distinction, each separation membrane module is collectively referred to as a “separation membrane module 10 ”.

[0054] In addition, the gas treatment system 1 is equipped with a plurality of auxiliary gas separation systems. Figure 1 In the example shown, the gas treatment system 1 includes two auxiliary gas separation systems, but the number of auxiliary gas separation systems is not limited. Each of the multiple auxiliary gas separation systems includes an auxiliary separation membrane module, a flow path (a plurality of flow paths such as the seventh flow path, the ninth flow path, and the tenth flow path described separately), and a switching unit (a plurality of switching units such as the fourth switching unit described separately). The gas separation system and the auxiliary gas separation system are connected via a flow path (a sixth flow path described separately) extending from the separation membrane module 10 of the gas separation system. As examples of the auxiliary separation membrane modules included in the auxiliary gas separation system, a fourth separation membrane module 14 and a fifth separation membrane module 15 are provided. When describing the fourth separation membrane module 14 and the fifth separation membrane module 15 without distinguishing between them, these separation membrane modules are collectively referred to as "auxiliary separation membrane modules 10S."

[0055] The following describes the details of the gas treatment system 1. It should be noted that, in the following description, each flow path corresponds to a gas path including at least one pipeline. Furthermore, while the switching unit is described using a three-way valve as an example, the switching unit is not limited to a three-way valve. Other examples of the switching unit include flow path switching valves other than three-way valves, and flow path switching mechanisms including multiple two-way valves disposed in each flow path to be switched. There is no limit on the number of three-way valves that the gas treatment system 1 may include. Each three-way valve may include a processing unit that actuates the valve body based on a control signal output from the control unit 60. Furthermore, while the measuring unit is described using a pressure sensor, the measuring unit is not limited to a pressure sensor. Other examples of the measuring unit include a flow sensor that measures the flow rate of gas, and a concentration sensor that measures the concentration of gas. There is no limit on the number of measuring units, such as pressure sensors, disposed in the gas treatment system 1. All of the multiple measuring units included in the gas processing system 1 may be of the same type that measures the same physical quantity (eg, pressure, flow rate, concentration) in the gas, or may be a combination of different types of measuring units that measure different physical quantities.

[0056] <Separation Membrane Module 10 and Auxiliary Separation Membrane Module 10S>

[0057] The structures of the separation membrane module 10 and the auxiliary separation membrane module 10S are described. Figure 2 As shown, the separation membrane module 10 includes a separation membrane 110 and a container 120. The separation membrane 110 is housed in the container 120. Similarly, the auxiliary separation membrane module 10S also includes the separation membrane 110 and the container 120.

[0058] The separation membrane 110 is, for example, a polymer membrane that selectively transmits CO2. Figure 2 In the example shown, the separation membrane 110 is a hollow fiber membrane bundle formed by combining a plurality of hollow fiber membranes, for example, several hundred to several hundred thousand. Here, the "inner space 110A" of the separation membrane 110 corresponds to the hollow space formed within each hollow fiber membrane. Furthermore, the "outer space 110B" of the separation membrane 110 corresponds to the space further outward from the outermost hollow fiber membrane among the hollow fiber membranes constituting the hollow fiber membrane bundle. However, the separation membrane 110 is not limited to a hollow fiber membrane bundle. Other examples of the separation membrane 110 include a membrane formed by stacking flat membranes or a spiral membrane formed by winding flat membranes.

[0059] The combustion exhaust gas supplied to the separation membrane module 10 is introduced into the inner space 110A through an opening on one side of the hollow fiber membrane bundle. At this point, the CO₂ in the combustion exhaust gas permeates the hollow fiber membranes. Specifically, the CO₂ in the combustion exhaust gas permeates the separation membrane 110 and reaches the outer space 110B. The gas that permeates the separation membrane 110 is referred to as "permeated gas."

[0060] On the other hand, other components in the combustion exhaust gas are introduced into the inner space 110A through an opening on one side of the hollow fiber membrane bundle and then discharged through an opening on the other side of the hollow fiber membrane bundle. In other words, other components in the combustion exhaust gas do not permeate the outer space 110B of the separation membrane 110, but instead pass through the inner space 110A of the separation membrane 110. Gas that does not permeate the outer space 110B of the separation membrane 110 but passes through the inner space 110A is referred to as "non-permeated gas." It should be noted that non-permeated gas may contain CO2 that has not permeated the separation membrane 110.

[0061] Examples of materials constituting separation membrane 110 include polymer materials such as polyimide, polyetherimide, polyamide, polyamideimide, polysulfone, polycarbonate, silicone resin, and cellulose polymers, and ceramic materials such as zeolite. Separation membrane 110 may also contain an ionic liquid. However, the materials constituting separation membrane 110 are not limited to these.

[0062] The container 120 includes an inlet 121, a first outlet 122, and a second outlet 123. The inlet 121 is an opening for allowing the combustion exhaust gas supplied to the separation membrane module 10 to flow into the container 120. The combustion exhaust gas flowing in through the inlet 121 is introduced into the space 110A inside the separation membrane 110. The first outlet 122 is an opening for the permeated gas that permeates from the space 110A inside the separation membrane 110 to the space 110B outside the separation membrane 110. The second outlet 123 is an opening for the non-permeated gas that has passed through the space 110A inside the separation membrane 110 to flow out.

[0063] The permeated gas flowing out of the first outlet 122 of the separation membrane module 10 is sometimes referred to as "permeated gas from the separation membrane module 10" or "permeated gas from the gas separation system." The non-permeated gas flowing out of the second outlet 123 of the separation membrane module 10 is sometimes referred to as "non-permeated gas from the separation membrane module 10" or "non-permeated gas from the gas separation system." The permeated gas from the separation membrane module 10 flows into the inlet 121 of the auxiliary separation membrane module 10S. The permeated gas flowing out of the first outlet 122 of the auxiliary separation membrane module 10S is sometimes referred to as "permeated gas from the auxiliary separation membrane module 10S" or "permeated gas from the auxiliary gas separation system." The non-permeated gas flowing out of the second outlet 123 of the auxiliary separation membrane module 10S is sometimes referred to as "non-permeated gas from the auxiliary separation membrane module 10S" or "non-permeated gas from the auxiliary gas separation system."

[0064] <Specific Example of Flow Path>

[0065] Next, specific examples of flow paths are described. The gas separation system including the first separation membrane module 11 further includes pipe 22a, pipe 22b, pipe 22c, pipe 22d, pipe 22e, pipe 22f, pipe 22g, pipe 26a, and pipe 27a. Pipe 27a is also a pipe shared with the gas separation system including the second separation membrane module 12 and the third separation membrane module 13. Pipes 22a and 22b are examples of a "first flow path." Pipe 22c is an example of a "second flow path." Pipe 22d and pipe 22e are examples of a "third flow path." Pipe 22f is an example of a "fourth flow path." Pipe 22g, pipe 26a, and pipe 27a are an example of a "sixth flow path."

[0066] The gas separation system including the second separation membrane module 12 further includes pipe 23a, pipe 23b, pipe 23c, pipe 23d, pipe 23e, pipe 23f, pipe 23g, pipe 26b, pipe 26c, and pipe 27a. Pipe 26b is a pipe shared with the gas separation system including the third separation membrane module 13. Pipes 23a and 23b are examples of a "first flow path." Pipe 23c is an example of a "second flow path." Pipes 23d and 23e are examples of a "third flow path." Pipe 23f is an example of a "fourth flow path." Pipes 23g, pipe 26b, pipe 26c, and pipe 27a are examples of a "sixth flow path."

[0067] The gas separation system including the third separation membrane module 13 further includes pipe 24a, pipe 24b, pipe 24c, pipe 24d, pipe 24e, pipe 24f, pipe 24g, pipe 26b, and pipe 27a. Pipes 24a and 24b are examples of a "first flow path." Pipe 24c is an example of a "second flow path." Pipes 24d and 24e are examples of a "third flow path." Pipe 24f is an example of a "fourth flow path." Pipes 24g, 26b, and 27a are examples of a "sixth flow path."

[0068] In the first embodiment, the pipes 22c, 23c, and 24c corresponding to the second flow paths of the respective gas separation systems are connected to the atmosphere, and the gas passing through the pipes 22c, 23c, and 24c is discharged to the outside.

[0069] The gas processing system 1 is provided with a fifth flow path that connects multiple gas separation systems. Examples of the fifth flow path include pipes 25a and 25b. One end of pipe 25a is connected to pipe 22e, an example of the third flow path. The other end of pipe 25a is connected to pipe 24e, an example of the third flow path. One end of pipe 25b is connected to the other end of pipe 25a. In other words, one end of pipe 25b is connected to pipe 24e. The other end of pipe 25b is connected to pipe 23e, an example of the third flow path.

[0070] The auxiliary gas separation system including the fourth separation membrane module 14 includes pipe 28a, pipe 28d, pipe 28e, pipe 28f, and pipe 28g. Pipe 28a is an example of the "seventh flow path." Pipes 28d and 28e are examples of the "ninth flow path." Pipe 28f is an example of the "tenth flow path." Pipe 28g is connected to the first outlet 122 of the fourth separation membrane module 14. Pipe 28g can also be connected to a storage tank for recovering the second permeated gas. The gas flowing through pipe 28g is discharged to the outside. The permeated gas from the fourth separation membrane module 14 is an example of the "second permeated gas."

[0071] The auxiliary gas separation system including the fifth separation membrane module 15 includes pipe 29a, pipe 29d, pipe 29e, pipe 29f, and pipe 29g. Pipe 29a is an example of the "seventh flow path." Pipes 29d and 29e are examples of the "ninth flow path." Pipe 29f is an example of the "tenth flow path." Pipe 29g is connected to the first outlet 122 of the fifth separation membrane module 15. Pipe 29g can also be connected to a storage tank for recovering the second permeated gas. The gas flowing through pipe 29g is discharged to the outside. The permeated gas from the fifth separation membrane module 15 is an example of the "second permeated gas."

[0072] <Specific Examples of the Connection Structure and Switching Section of the Separation Membrane Module 10>

[0073] like Figure 1 As shown, the first separation membrane module 11, the second separation membrane module 12, and the third separation membrane module 13 are each connected to, for example, a ship's engine 100E. Combustion exhaust gas emitted from the ship's engine 100E is supplied to each of the first separation membrane module 11, the second separation membrane module 12, and the third separation membrane module 13. By supplying the combustion exhaust gas to at least two of the multiple separation membrane modules 10, even if the separation membrane of one separation membrane module 10 becomes blocked, CO2 can still be separated from the combustion exhaust gas by the separation membrane modules 10 of the other separation membrane modules 10. This improves CO2 recovery efficiency.

[0074] First, the connection structure between the ship's engine 100E and the first separation membrane module 11 will be described. The first separation membrane module 11 is connected to the ship's engine 100E via pipe 21, pipe 22a, and pipe 22b. An equalization pipe 21D may be located between pipe 21 and pipe 22a. Combustion exhaust gas from the ship's engine 100E flows through these pipes and reaches the first separation membrane module 11. Pipe 22b is connected to the inlet 121 of the first separation membrane module 11.

[0075] A three-way valve 31a is disposed between pipes 22a and 22b. Specifically, the three-way valve 31a is provided in the first flow path encompassing pipes 22a and 22b. The three-way valve 31a is an example of a "first switching unit." The three-way valve 31a includes a first port 31a1, a second port 31a2, a third port 31a3, and a valve body for switching the ports open and closed.

[0076] The first port 31a1 of the three-way valve 31a is connected to the pipe 22a. The second port 31a2 is connected to the pipe 22b. The third port 31a3 is connected to the pipe 22c. A filter, for example, for adsorbing impurities, may be provided in the pipe 22c. A second flow path corresponding to the pipe 22c branches off from the first flow path comprising the pipes 22a and 22b via the three-way valve 31a.

[0077] By operating the valve body of the three-way valve 31a and opening the first port 31a1 and the second port 31a2, pipes 22a and 22b are connected, while pipe 22c is closed. This opens the first flow path including pipes 22a and 22b. Conversely, by operating the valve body of the three-way valve 31a and opening the second port 31a2 and the third port 31a3, pipes 22a and 22b are disconnected, while pipes 22b and 22c are connected. This opens the second flow path including pipe 22c.

[0078] Next, the connection structure between the ship's engine 100E and the second separation membrane module 12 will be described. The second separation membrane module 12 is connected to the ship's engine 100E via a pipe 21, a pipe 23a, and a pipe 23b. An equalization pipe 21D may be located between the pipe 21 and the pipe 23a. Combustion exhaust gas from the ship's engine 100E flows through these pipes and reaches the second separation membrane module 12. The pipe 23b is connected to the inlet 121 of the second separation membrane module 12.

[0079] A three-way valve 31b can be arranged between pipes 23a and 23b. That is, the three-way valve 31b is provided in the first flow path including pipes 23a and 23b. The three-way valve 31b is an example of a "first switching unit." The three-way valve 31b includes a first port 31b1, a second port 31b2, a third port 31b3, and a valve body for switching the opening and closing of each port. The first port 31b1 of the three-way valve 31b is connected to pipe 23a. The second port 31b2 is connected to pipe 23b. The third port 31b3 is connected to pipe 23c. A filter, for example, for adsorbing impurities, can be provided in pipe 23c.

[0080] By operating the valve body of three-way valve 31b and opening the first port 31b1 and the second port 31b2, pipes 23a and 23b are connected, while pipe 23c is closed. This opens the first flow path including pipes 23a and 23b. Conversely, by operating the valve body of three-way valve 31b and opening the second port 31b2 and the third port 31b3, pipes 23a and 23b are disconnected, while pipes 23b and 23c are connected. This opens the second flow path including pipe 23c.

[0081] Next, the connection structure between the ship's engine 100E and the third separation membrane module 13 will be described. The third separation membrane module 13 is connected to the ship's engine 100E via pipe 21, pipe 24a, and pipe 24b. An equal distribution pipe 21D may be located between pipe 21 and pipe 24a. Combustion exhaust gas discharged from the ship's engine 100E flows through these pipes and reaches the third separation membrane module 13. Pipe 24b, part of the flow path consisting of pipes 24a and 24b, is connected to the inlet 121 of the third separation membrane module 13.

[0082] A three-way valve 31c can be arranged between pipes 24a and 24b. Specifically, the three-way valve 31c is disposed in the first flow path including pipes 24a and 24b. The three-way valve 31c includes a first port 31c1, a second port 31c2, a third port 31c3, and a valve body for switching the opening and closing of each port. The three-way valve 31c is an example of a "first switching unit." The first port 31c1 of the three-way valve 31c is connected to pipe 24a. The second port 31c2 is connected to pipe 24b. The third port 31c3 is connected to pipe 24c. A filter, for example, to adsorb impurities, can be disposed in pipe 24c.

[0083] By operating the valve body of three-way valve 31c and opening the first port 31c1 and the second port 31c2, pipes 24a and 24b are connected, while pipe 24c is closed. This opens the first flow path including pipes 24a and 24b. Conversely, by operating the valve body of three-way valve 31c and opening the second port 31c2 and the third port 31c3, pipes 24a and 24b are disconnected, while pipes 24b and 24c are connected. This opens the second flow path including pipe 24c.

[0084] Next, the connection structure between the first separation membrane module 11 and the second separation membrane module 12 will be described. The first separation membrane module 11 and the second separation membrane module 12 are interconnected via pipe 22d, pipe 22e, pipe 25a, pipe 25b, pipe 23e, and pipe 23d. That is, the third flow path (pipe 22d, pipe 22e) connected to the first separation membrane module 11 and the third flow path (pipe 23d, pipe 23e) connected to the second separation membrane module 12 are connected via a fifth flow path including pipe 25a and pipe 25b. It should be noted that the fifth flow path is configured to connect the third flow paths connected to the multiple separation membrane modules 10. The fifth flow path between the third flow path (pipe 22d, pipe 22e) connected to the first separation membrane module 11 and the third flow path (pipe 24d, pipe 24e) connected to the third separation membrane module 13 corresponds to pipe 25a. Furthermore, a fifth flow path between the third flow path (pipe 23d, pipe 23e) connected to the second separation membrane module 12 and the third flow path (pipe 24d, pipe 24e) connected to the third separation membrane module 13 corresponds to the pipe 25b.

[0085] Pipe 22d is connected to the second outlet 123 of the first separation membrane module 11. A three-way valve 31d is disposed between pipe 22d and pipe 22e. Specifically, three-way valve 31d is provided in the third flow path, which includes pipes 22d and 22e. A filter may also be provided in pipe 22e. Three-way valve 31d is an example of a "second switching unit."

[0086] The three-way valve 31d includes a first port 31d1, a second port 31d2, a third port 31d3, and a valve body for switching the ports open and closed. The first port 31d1 of the three-way valve 31d is connected to the pipe 22d. The second port 31d2 is connected to the pipe 22e. The third port 31d3 is connected to the pipe 22f. The non-permeated gas from the first separation membrane module 11 flows through the pipes 22d and 22f and is discharged to the outside. A filter may also be provided in the pipe 22f.

[0087] By operating the valve body of three-way valve 31d and opening first port 31d1 and second port 31d2, pipes 22d and 22e are connected, while pipes 22d and 22f are disconnected. This opens the third flow path, which includes pipes 22d and 22e. By operating the valve body of three-way valve 31d and opening first port 31d1 and third port 31d3, pipes 22d and 22f are connected, while pipes 22d and 22e are disconnected. This opens the fourth flow path, which includes pipe 22f.

[0088] Pipeline 23d is connected to the second outlet 123 of the second separation membrane module 12. A three-way valve 31e is arranged between pipeline 23d and pipeline 23e. In other words, the three-way valve 31e is set in the third flow path including pipeline 23d and pipeline 23e. The three-way valve 31e is an example of a "second switching unit". The three-way valve 31e has a first port 31e1, a second port 31e2, a third port 31e3, and a valve body for switching the opening and closing of each port. The first port 31e1 of the three-way valve 31e is connected to pipeline 23d. The second port 31e2 is connected to pipeline 23e. The third port 31e3 is connected to pipeline 23f. A filter can be set in pipeline 23f.

[0089] By operating the valve body of the three-way valve 31e and opening the first port 31e1 and the second port 31e2, pipe 23d is connected to pipe 23e, while pipe 23d is disconnected from pipe 23f. This opens the third flow path, which includes pipes 23d and 23e. Conversely, by operating the valve body of the three-way valve 31e and opening the first port 31e1 and the third port 31e3, pipe 23d is disconnected from pipe 23e, while pipe 23d is connected to pipe 23f. This opens the fourth flow path, which includes pipe 23f. When pipes 23d and 23e are connected, the retentate gas from the second separation membrane module 12 flows through pipe 25b and pipe 25a toward the three-way valve 31d. When pipes 23d and 23f are connected, the retentate gas from the second separation membrane module 12 is discharged to the outside.

[0090] Next, the connection structure between the first separation membrane module 11 and the third separation membrane module 13 will be described. The first separation membrane module 11 and the third separation membrane module 13 are connected to each other via the pipe 22d, the pipe 22e, the pipe 25a, the pipe 24e, and the pipe 24d.

[0091] A three-way valve 31f is arranged between pipe 24d and pipe 24e. Specifically, the three-way valve 31f is disposed in the third flow path including pipes 24d and 24e. The three-way valve 31f is an example of a "second switching unit." The three-way valve 31f includes a first port 31f1, a second port 31f2, a third port 31f3, and a valve body for switching the opening and closing of each port. The first port 31f1 of the three-way valve 31f is connected to pipe 24d. The second port 31f2 is connected to pipe 24e. The third port 31f3 is connected to pipe 24f. A filter may be provided in pipe 24f.

[0092] By operating the valve body of the three-way valve 31f and opening the first port 31f1 and the second port 31f2, pipe 24d is connected to pipe 24e, while pipe 24d is disconnected from pipe 24f. This opens the third flow path including pipes 24d and 24e. Conversely, by operating the valve body of the three-way valve 31f and opening the first port 31f1 and the third port 31f3, pipe 24d is connected to pipe 24f, while pipe 24d is disconnected from pipe 24e. This opens the fourth flow path including pipe 24f. When the flow path including pipes 24d and 24e is open, the retentate gas from the third separation membrane module 13 flows through pipe 25a toward the three-way valve 31d. When the flow path including pipes 24d and 24f is open, the retentate gas from the third separation membrane module 13 is discharged to the outside.

[0093] <Connection Structure and Switching Section of the Auxiliary Separation Membrane Module 10S>

[0094] Next, the connection structure and switching unit of the auxiliary separation membrane module 10S will be described. The fourth separation membrane module 14 and the fifth separation membrane module 15 are each connected to at least one of the first separation membrane module 11, the second separation membrane module 12, and the third separation membrane module 13. The permeated gas from the first separation membrane module 11, the second separation membrane module 12, and the third separation membrane module 13 is supplied to each of the fourth separation membrane module 14 and the fifth separation membrane module 15.

[0095] First, the connection structure between the first separation membrane module 11 and the fourth separation membrane module 14 will be described. The first separation membrane module 11 and the fourth separation membrane module 14 are connected via the pipe 22g, the pipe 26a, the pipe 27a, and the pipe 28a.

[0096] A three-way valve 31g is disposed between the pipe 27a and the pipe 28a. The three-way valve 31g includes a first port 31g1, a second port 31g2, a third port 31g3, and a valve body for switching the opening and closing of each port.

[0097] The first port 31g1 of the three-way valve 31g is connected to the pipe 28a, the second port 31g2 is connected to the pipe 29a (described separately), and the third port 31g3 is connected to the pipe 27a.

[0098] By operating the valve body of the three-way valve 31g and opening the first port 31g1 and the third port 31g3, pipes 27a and 28a are connected, while pipe 29a is closed. This opens the flow path including pipes 27a and 28a. Conversely, by operating the valve body of the three-way valve 31g and opening the second port 31g2 and the third port 31g3, pipes 27a and 28a are disconnected, while pipes 27a and 29a are connected. This opens the flow path including pipes 27a and 29a.

[0099] Next, the connection structure between the second separation membrane module 12 and the fourth separation membrane module 14 will be described. The second separation membrane module 12 and the fourth separation membrane module 14 are connected via the pipe 23g, the pipe 26c, the pipe 27a, and the pipe 28a.

[0100] Next, the connection structure between the third separation membrane module 13 and the fourth separation membrane module 14 will be described. The third separation membrane module 13 and the fourth separation membrane module 14 are connected via the pipe 24g, the pipe 26b, the pipe 27a, and the pipe 28a.

[0101] Next, the connection structure between the first separation membrane module 11 and the fifth separation membrane module 15 will be described. The first separation membrane module 11 and the fifth separation membrane module 15 are connected via the pipe 22g, the pipe 26a, the pipe 27a, and the pipe 29a.

[0102] Next, the connection structure between the second separation membrane module 12 and the fifth separation membrane module 15 will be described. The second separation membrane module 12 and the fifth separation membrane module 15 are connected via the pipe 23g, the pipe 26c, the pipe 27a, and the pipe 29a.

[0103] Next, the connection structure between the third separation membrane module 13 and the fifth separation membrane module 15 will be described. The third separation membrane module 13 and the fifth separation membrane module 15 are connected via the pipe 24g, the pipe 26b, the pipe 27a, and the pipe 29a.

[0104] Next, the connection structure between the fourth separation membrane module 14 and the fifth separation membrane module 15 will be described. The fourth separation membrane module 14 and the fifth separation membrane module 15 are interconnected via pipe 28d, pipe 28e, pipe 25c, pipe 29e, and pipe 29d. Specifically, the ninth flow path (pipe 28d, pipe 28e) connected to the fourth separation membrane module 14 and the ninth flow path (pipe 29d, pipe 29e) connected to the fifth separation membrane module 15 are connected via the eleventh flow path corresponding to pipe 25c.

[0105] Pipe 28d is connected to the second outlet 123 of the fourth separation membrane module 14. A three-way valve 31h is disposed between pipe 28d and pipe 28e. Specifically, three-way valve 31h is provided in the ninth flow path, which includes pipes 28d and 28e. A filter may also be provided in pipe 28e. Three-way valve 31h is an example of a "fourth switching unit."

[0106] The three-way valve 31h includes a first port 31h1, a second port 31h2, a third port 31h3, and a valve body for switching the ports open and closed. The first port 31h1 of the three-way valve 31h is connected to the pipe 28d. The second port 31h2 is connected to the pipe 28e. The third port 31h3 is connected to the pipe 28f. The non-permeated gas from the fourth separation membrane module 14 flows through the pipes 28d and 28f and is discharged to the outside. A filter may be provided in the pipe 28f.

[0107] By operating the valve body of three-way valve 31h and opening first port 31h1 and second port 31h2, pipes 28d and 28e are connected, while pipes 28d and 28f are disconnected. This opens the ninth flow path, which includes pipes 28d and 28e. Conversely, by operating the valve body of three-way valve 31h and opening first port 31h1 and third port 31h3, pipes 28d and 28f are connected, while pipes 28d and 28e are disconnected. This opens the tenth flow path, which includes pipe 28f.

[0108] Pipeline 29d is connected to the second outlet 123 of the fifth separation membrane module 15. A three-way valve 31i is arranged between pipeline 29d and pipeline 29e. That is, the three-way valve 31i is set in the ninth flow path including pipeline 29d and pipeline 29e. The three-way valve 31i is an example of a "fourth switching unit". The three-way valve 31i has a first port 31i1, a second port 31i2, a third port 31i3, and a valve body for switching the opening and closing of each port. The first port 31i1 of the three-way valve 31i is connected to pipeline 29d. The second port 31i2 is connected to pipeline 29e. The third port 31i3 is connected to pipeline 29f. A filter can be set in pipeline 29f.

[0109] By operating the valve body of the three-way valve 31i and opening the first port 31i1 and the second port 31i2, pipe 29d is connected to pipe 29e and disconnected from pipe 29d and pipe 29f. This opens the ninth flow path, which includes pipes 29d and 29e. Conversely, by operating the valve body of the three-way valve 31i and opening the first port 31i1 and the third port 31i3, pipes 29d and 29e are disconnected and connected to pipe 29d and pipe 29f. This opens the tenth flow path, which includes pipe 29f. When pipes 29d and 29e are connected, the retentate gas from the fifth separation membrane module 15 flows through pipe 25c toward the three-way valve 31h. When pipes 29d and 29f are connected, the retentate gas from the fifth separation membrane module 15 is discharged to the outside.

[0110] <Measurement Department>

[0111] Next, an example of a measuring unit is described. Figure 1 As shown, the gas treatment system 1 may include, for example, a measuring unit 41a for measuring the pressure of the combustion exhaust gas supplied to the first separation membrane module 11, a measuring unit 41b for measuring the pressure of the permeated gas from the first separation membrane module 11, and a measuring unit 41c for measuring the pressure of the non-permeated gas from the first separation membrane module 11. Separate measuring units may be provided for measuring the pressure of the combustion gas supplied to other separation membrane modules 10, for measuring the pressure of the permeated gas from other separation membrane modules 10, and for measuring the pressure of the non-permeated gas from other separation membrane modules 10.

[0112] The measuring unit 41a is provided in the pipe 22b, for example. The measuring unit 41b is provided in the pipe 22g, for example. The measuring unit 41c is provided in the pipe 22d, for example. The measuring units 41a, 41b, and 41c output measurement signals indicating the measured pressure values ​​(measured values) to the control unit 60.

[0113] The measuring unit 41a may be a flow sensor for measuring the flow rate of the combustion exhaust gas supplied to the first separation membrane module 11, or a concentration sensor for measuring the CO₂ concentration in the combustion exhaust gas supplied to the first separation membrane module 11. The measuring unit 41b may be a flow sensor for measuring the flow rate of the permeated gas from the first separation membrane module 11, or a concentration sensor for measuring the CO₂ concentration in the permeated gas from the first separation membrane module 11. The measuring unit 41c may be a flow sensor for measuring the flow rate of the non-permeated gas from the first separation membrane module 11, or a concentration sensor for measuring the CO₂ concentration in the non-permeated gas from the first separation membrane module 11.

[0114] <Compressor>

[0115] The compressor 51 compresses the gas flowing into the inlet 121 of the separation membrane module 10. Figure 1 In the illustrated example, two compressors 51a and 51b are provided. The compressor 51a is, for example, installed in the duct 21. The compressor 51a compresses the combustion exhaust gas discharged from the ship's engine 100E. The high-pressure combustion exhaust gas compressed by the compressor 51a is supplied to the first separation membrane module 11, the second separation membrane module 12, and the third separation membrane module 13, respectively. However, the location of the compressor 51a is not limited; it can be located upstream of the ship's engine 100E relative to the first separation membrane module 11, the second separation membrane module 12, and the third separation membrane module 13.

[0116] The compressor 51b is installed in the pipe 27a. The compressor 51b compresses the permeated gas from the first separation membrane module 11, the second separation membrane module 12, and the third separation membrane module 13. The high-pressure gas compressed by the compressor 51b is supplied to the fourth separation membrane module 14 and the fifth separation membrane module 15.

[0117] <Control Unit>

[0118] Next, the control unit 60 will be described. Figure 3 As shown, the control unit 60 is, for example, an information processing device including a processing unit 61, a storage unit 62, and a communication unit 63. The processing unit 61, the storage unit 62, and the communication unit 63 are connected to each other via a bus 68.

[0119] The control unit 60 is connected to the measuring units 41a, 41b, and 41c in a communicable manner. The control unit 60 is connected to the three-way valves 31a, 31b, 31c, 31d, 31e, 31f, 31g, 31h, and 31i in a communicable manner.

[0120] The processing unit 61 is a processor that controls and processes various operations in the control unit 60. An example of the processing unit 61 is a CPU (Central Processing Unit). Alternatively, the processing unit 61 may be composed of other electronic circuits that perform the same functions as a processor such as a CPU.

[0121] The storage unit 62 stores the program executed by the calculation processing unit 61 and various data required for executing the program. Examples of the storage unit 62 include nonvolatile storage media such as ROM (Read Only Memory).

[0122] The communication unit 63 is a communication interface including components such as a communication circuit and an antenna for respectively communicating between the measuring units 41a, 41b, and 41c and the three-way valves 31a, 31b, 31c, 31d, 31e, 31f, 31g, 31h, and 31i.

[0123] Next, the various functions of the processing unit 61 will be described. The processing unit 61 functions as various units, such as the acquisition unit 611 and the detection unit 612. The processing unit 61 executes programs stored in the storage unit 62, causing the control unit 60 to function as these various units. The programs can be stored in a computer-readable storage medium and provided, or provided via a communication network such as the Internet.

[0124] The acquisition unit 611 receives measurement signals from the measurement units 41a, 41b, and 41c via the communication unit 63. Thus, the acquisition unit 611 acquires various information, including information related to the pressure of the combustion exhaust gas supplied to the first separation membrane module 11, the pressure of the permeated gas from the first separation membrane module 11, and the pressure of the non-permeated gas from the first separation membrane module 11.

[0125] The detection unit 612 detects blockage of the first separation membrane module 11 based on the information acquired by the acquisition unit 611. For example, the detection unit 612 detects blockage of the first separation membrane module 11 when the pressure of the combustion exhaust gas supplied to the first separation membrane module 11 exceeds a predetermined threshold, or when the pressure of the permeated gas from the first separation membrane module 11 or the pressure of the non-permeated gas from the first separation membrane module 11 falls below a predetermined threshold.

[0126] Furthermore, when the measuring units 41a, 41b, and 41c are flow rate sensors, blockage of the first separation membrane module 11 can be detected when the flow rate of the combustion exhaust gas supplied to the first separation membrane module 11, the flow rate of the permeated gas from the first separation membrane module 11, and the flow rate of the non-permeated gas from the first separation membrane module 11 fall below predetermined threshold values. The control unit 60 can also detect blockage of other separation membrane modules 10 using the same method.

[0127] When the detection unit 612 detects blockage in the first separation membrane module 11, it outputs a control signal to a specific three-way valve among the three-way valves 31a, 31b, 31c, 31d, 31e, 31f, 31g, 31h, and 31i. As the control signal from the detection unit 612 is output to the specific three-way valve, the first separation membrane module 11 is cleaned.

[0128] <Cleaning Operation of Separation Membrane Module>

[0129] Next, refer to Figure 4 and Figure 5 , the cleaning operation of the separation membrane module 10 performed by the gas treatment system 1 will be described. Figure 4 This is a diagram for explaining the CO 2 separation operation of the separation membrane module 10 . Figure 5 This is a diagram for explaining the cleaning operation of the separation membrane module 10 .

[0130] As a premise, refer to Figure 4 , the CO2 separation operation of the first separation membrane module will be described. Hereinafter, as the first separation membrane module, the CO2 separation operation of the first separation membrane module 11 will be described, but the other separation membrane modules 10 can also perform the same CO2 separation operation. Figure 4 As shown, three-way valve 31a connects pipe 22a with pipe 22b and closes pipe 22c. Thus, the combustion exhaust gas discharged from the ship's engine 100E is supplied to the first separation membrane module 11. At this time, three-way valve 31b can connect pipe 23a with pipe 23b or close it. That is, the combustion exhaust gas discharged from the ship's engine 100E can be supplied to the second separation membrane module 12 or not. Furthermore, three-way valve 31c can connect pipe 24a with pipe 24b or close it. That is, the combustion exhaust gas discharged from the ship's engine 100E can be supplied to the third separation membrane module 13 or not.

[0131] The three-way valve 31d connects pipe 22d with pipe 22f, but blocks pipe 22d from connecting with pipe 22e. The non-permeated gas from the first separation membrane module 11 flows through pipe 22d and pipe 22f and is discharged to the outside. Conversely, the permeated gas from the first separation membrane module 11 flows through pipe 22g, pipe 26a, pipe 27a, and pipe 28a to the fourth separation membrane module 14. It should be noted that the permeated gas from the first separation membrane module 11 can also flow through pipe 22g, pipe 26a, pipe 27a, and pipe 29a to the fifth separation membrane module 15.

[0132] When combustion exhaust gas is supplied to the second separation membrane module 12, the three-way valve 31e connects pipe 23d with pipe 23f, while blocking pipe 23d from connecting with pipe 23e. Retentate gas from the second separation membrane module 12 flows through pipe 23d and pipe 23f and is discharged to the outside. Conversely, permeate gas from the second separation membrane module 12 flows through pipe 23g, pipe 26c, pipe 26b, pipe 27a, and pipe 28a to the fourth separation membrane module 14. It should be noted that permeate gas from the second separation membrane module 12 can also flow through pipe 23g, pipe 26c, pipe 26b, pipe 27a, and pipe 29a to the fifth separation membrane module 15.

[0133] When combustion exhaust gas is supplied to the third separation membrane module 13, the three-way valve 31f connects pipes 24d and 24f, while blocking pipes 24d and 24e. Retentate gas from the third separation membrane module 13 flows through pipes 24d and 24f and is discharged to the outside. Conversely, permeate gas from the third separation membrane module 13 flows through pipes 24g, 26b, 27a, and 28a to the fourth separation membrane module 14. It should be noted that permeate gas from the third separation membrane module 13 can also flow through pipes 24g, 26b, 27a, and 29a to the fifth separation membrane module 15.

[0134] The CO2 separation operation of the fourth separation membrane module 14 will be described. Figure 4 As shown, the three-way valve 31g connects the pipe 27a with the pipe 28a and closes the pipe 29a. Thus, the permeated gas from at least one of the first separation membrane module 11, the second separation membrane module 12, and the third separation membrane module 13 is supplied to the fourth separation membrane module 14.

[0135] Three-way valve 31h connects pipe 28d with pipe 28f, but blocks pipe 28d from connecting with pipe 28e. Retentate gas from the fourth separation membrane module 14 flows through pipe 28d and pipe 28f and is discharged to the outside. Permeate gas from the fourth separation membrane module 14 flows through pipe 28g to, for example, a storage tank.

[0136] The CO2 separation operation of the fifth separation membrane module 15 can be similar to that of the fourth separation membrane module. For example, the three-way valve 31g connects the pipe 27a with the pipe 29a and closes the pipe 28a. This allows the permeated gas from at least one of the first separation membrane module 11, the second separation membrane module 12, and the third separation membrane module 13 to be supplied to the fifth separation membrane module 15.

[0137] Three-way valve 31i connects pipe 29d with pipe 29f, but blocks pipe 29d from connecting with pipe 29e. Retentate gas from the fifth separation membrane module 15 flows through pipe 29d and pipe 29f and is discharged to the outside. Permeate gas from the fifth separation membrane module 15 flows through pipe 29g, for example, to a storage tank.

[0138] Next, refer to Figure 5 The cleaning operation for the first separation membrane module will be described. Hereinafter, the cleaning operation for the first separation membrane module 11 will be described as the first separation membrane module, but the same cleaning operation can be performed for the other separation membrane modules 10. Furthermore, while the second separation membrane module 12 is used as the second separation membrane module for supplying the non-permeated gas for cleaning the first separation membrane module, another separation membrane module can also be used as the second separation membrane module. Furthermore, while the third separation membrane module 13 is used as the third separation membrane module, another separation membrane module 10 can also be used as the third separation membrane module.

[0139] First, the detection unit 612 of the control unit 60 detects blockage of the first separation membrane module 11 based on the measurement values ​​obtained from the measurement units 41 a , 41 b , and 41 c .

[0140] Next, the detection unit 612 outputs control signals to the three-way valves 31a, 31d, and 31e, respectively. Furthermore, when the combustion exhaust gas is not supplied to the second separation membrane module 12, the detection unit 612 outputs a control signal to the three-way valve 31b.

[0141] The three-way valve 31a blocks the communication between the pipe 22a and the pipe 22b and connects the pipe 22b and the pipe 22c according to the control signal from the detection unit 612. Thus, the supply of the combustion exhaust gas to the first separation membrane module 11 is stopped.

[0142] The three-way valve 31b allows the pipe 23a and the pipe 23b to communicate with each other in response to a control signal from the detection unit 612. As a result, the combustion exhaust gas is supplied to the second separation membrane module 12.

[0143] In response to a control signal from the detection unit 612, the three-way valve 31d disconnects the pipe 22d from the pipe 22f and connects the pipe 22d to the pipe 22e. Furthermore, in response to a control signal from the detection unit 612, the three-way valve 31e disconnects the pipe 23d from the pipe 23f and connects the pipe 23d to the pipe 23e. This connects the pipe 22d, the pipe 22e, the pipe 25a, the pipe 25b, the pipe 23e, and the pipe 23d. Specifically, when cleaning the separation membrane module 10 included in the first gas separation system, in the first gas separation system, the second flow path (e.g., pipe 22c) is opened by the first switching unit (e.g., the three-way valve 31a), and the third flow path (e.g., pipes 22d and 22e) is opened by the second switching unit (e.g., the three-way valve 31d). Furthermore, in the second gas separation system including the second separation membrane module 12, the first flow path (e.g., pipes 23a and 23b) is opened by the first switching unit (e.g., three-way valve 31b), and the third flow path (e.g., pipes 23d and 23e) is opened by the second switching unit (e.g., three-way valve 31e). As a result, the non-permeated gas from the second separation membrane module 12 flows through the fifth flow path (e.g., pipes 25a and 25b) to the third flow path (e.g., pipes 22d and 22e) and the first separation membrane module 11.

[0144] Through these operations of the three-way valves 31b, 31d, and 31e, the retentate gas from the second separation membrane module 12 can be supplied to the second outlet 123 of the first separation membrane module 11. Specifically, the retentate gas from the second separation membrane module 12 can flow into the space 110A inside the separation membrane 110 in the first separation membrane module 11. This allows the first separation membrane module 11 to be cleaned with the retentate gas from the second separation membrane module 12. In other words, the first separation membrane module can be cleaned with the retentate gas from the second separation membrane module.

[0145] The pressure of the retentate gas from the second separation membrane module 12 is higher than the permeate gas from the second separation membrane module 12. This allows the first separation membrane module 11 to be cleaned using the relatively high-pressure retentate gas from the second separation membrane module 12. Consequently, the cleaning function of the first separation membrane module 11 can be ensured. Furthermore, there is no need for dedicated components for cleaning the first separation membrane module 11. Furthermore, by appropriately combining the pipe for the flow of retentate gas from the first separation membrane module 11 and the pipe for the flow of retentate gas from the second separation membrane module 12, it is possible to supply retentate gas from the second separation membrane module 12 to the first separation membrane module 11 during cleaning. This simplifies the structure for cleaning the first separation membrane module 11.

[0146] Furthermore, the combustion exhaust gas supplied to the second separation membrane module 12 is pressurized by the compressor 51a. That is, the retentate gas from the second separation membrane module 12 flows into the first separation membrane module 11 while under elevated pressure. This allows relatively high-pressure gas to flow into the space 110A inside the separation membrane 110 in the first separation membrane module 11. This improves the cleaning function of the first separation membrane module 11. It should be noted that even when the second separation membrane module is a separation membrane module 10 other than the second separation membrane module 12, the pressure of the retentate gas from the separation membrane module 10 corresponding to the second separation membrane module can be increased by the compressor 51a.

[0147] Furthermore, during the cleaning operation of the first separation membrane module 11, even if the permeated gas from the first separation membrane module 11 is not supplied to the fourth separation membrane module 14 and the fifth separation membrane module 15, the permeated gas from the second separation membrane module 12 is supplied to the fourth separation membrane module 14 and the fifth separation membrane module 15. Thus, even while the cleaning operation of the first separation membrane module 11 is in progress, gas can continue to be supplied to the fourth separation membrane module 14 and the fifth separation membrane module 15 on the downstream side. Consequently, the CO2 concentration can be increased.

[0148] The detection unit 612 may also output a control signal to the three-way valve 31 f. In addition, when the combustion exhaust gas is not supplied to the third separation membrane module 13, the detection unit 612 may also output a control signal to the three-way valve 31 c.

[0149] The three-way valve 31c allows the pipe 24a and the pipe 24b to communicate with each other in response to a control signal from the detection unit 612. As a result, the combustion exhaust gas is supplied to the third separation membrane module 13.

[0150] In response to a control signal from the detection unit 612, the three-way valve 31f disconnects pipe 24d from pipe 24f and connects pipe 24d to pipe 24e. This connects pipes 22a, 22e, 25a, 24e, and 24d. Consequently, the retentate gas from the third separation membrane module 13 can be supplied to the second outflow port 123 of the first separation membrane module 11. In other words, in addition to the retentate gas from the second separation membrane module 12, the retentate gas from the third separation membrane module 13 can also flow into the space 110A inside the separation membrane 110 of the first separation membrane module 11. This further enhances the cleaning function of the first separation membrane module 11.

[0151] Next, the cleaning operation of the auxiliary separation membrane module 10S will be described. While the following description uses the example of cleaning the fifth separation membrane module 15 with the retentate gas from the fourth separation membrane module 14, this is not limiting. That is, the fourth separation membrane module 14 can also be cleaned with the retentate gas from the fifth separation membrane module 15. It should be noted that, although not shown in the figure, it is assumed that the fifth separation membrane module 15 is provided with a measuring unit similar to, for example, the measuring units 41a, 41b, and 41c. The measuring unit provided in the fifth separation membrane module 15 outputs measurement signals related to the pressures of, for example, pipes 29a, 29g, and 29d to the control unit 60. When cleaning the fourth separation membrane module 14, it is also assumed that the fourth separation membrane module 14 is provided with a measuring unit similar to, for example, the measuring units 41a, 41b, and 41c. The measuring unit provided in the fourth separation membrane module 14 outputs measurement signals related to the pressures of, for example, pipes 28a, 28g, and 28d to the control unit 60.

[0152] The detection unit 612 of the control unit 60 detects blockage of the fifth separation membrane module 15 based on the measurement value obtained from the measurement unit. Then, the detection unit 612 outputs control signals to the three-way valves 31g, 31h, and 31i respectively.

[0153] The three-way valve 31g closes the connection between the pipe 27a and the pipe 29a and connects the pipe 27a and the pipe 28a according to the control signal from the detection unit 612. Thus, for example, the permeated gas from the first separation membrane module 11 flows to the fourth separation membrane module 14.

[0154] The three-way valve 31h connects the pipe 28d with the pipe 28e in response to a control signal from the detection unit 612. Furthermore, the three-way valve 31i connects the pipe 29d with the pipe 29e in response to a control signal from the detection unit 612. This connects the pipes 28d, 28e, 25c, 29e, and 29d. Consequently, the retentate gas from the fourth separation membrane module 14 can be supplied to the second outlet 123 of the fifth separation membrane module 15. In other words, the retentate gas from the fourth separation membrane module 14 can flow into the space 110A inside the separation membrane 110 in the fifth separation membrane module 15. This allows the fifth separation membrane module 15 to be cleaned with the retentate gas from the fourth separation membrane module 14. It should be noted that the retentate gas supplied from the fourth separation membrane module 14 and passing through the fifth separation membrane module 15 can be discharged to the outside, for example, through a pipe provided in the fifth separation membrane module 15.

[0155] During the cleaning operation of the separation membrane module 10 and the auxiliary separation membrane module 10S, the operation of each three-way valve is controlled by the control unit 60, but the three-way valves can also be operated manually. In addition, during the cleaning operation of the auxiliary separation membrane module 10S, the three-way valves can also be operated manually.

[0156] [Modification]

[0157] Next, refer to Figures 6 to 8 A modified example of the gas treatment system 1 according to the first embodiment will be described. In the modified example, components identical to those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

[0158] Reference Figure 6 Next, a configuration example of a gas treatment system 1 according to a modified example will be described. The gas treatment system 1 according to the modified example may include a vacuum pump 51c, a vacuum pump 52, and a vacuum pump 53. The vacuum pump 51c is an example of a "second decompression unit." The vacuum pump 52 is an example of a "first decompression unit." The vacuum pump 53 is an example of a "third decompression unit." The vacuum pump 51c is installed in the pipe 27a. The vacuum pump 51c suctions the permeated gas from the first outlet 122 of the first separation membrane module 11, the second separation membrane module 12, and the third separation membrane module 13, and directs the suctioned permeated gas to the fourth separation membrane module 14 and the fifth separation membrane module. As described separately, the vacuum pump 52 is configured to suction the non-permeated gas discharged from the inlet 121 of the cleaned separation membrane module 10 after cleaning. The vacuum pump 52 is connected to the second flow path of each gas separation system. Furthermore, a vacuum pump 53 is provided to suction the permeated gas from the fourth separation membrane module 14 and the permeated gas from the fifth separation membrane module. The vacuum pump 53 is connected to the first outlet 122 of the fourth separation membrane module 14 and the first outlet 122 of the fifth separation membrane module 15 via pipes HS1 and HS2. Furthermore, a blower 51a-2 may be provided in place of the compressor 51a provided in the pipe 21 in the first embodiment. The combustion exhaust gas from the engine 100E, blown by the blower 51a-2, increases its flow rate and flows to the first separation membrane module 11, the second separation membrane module 12, and the third separation membrane module 13.

[0159] In addition, in the modified example, the configuration of the flow path and the configuration of the switching unit included in the assist gas separation system are different. The assist gas separation system of the modified example further includes an eighth flow path and a third switching unit, which will be described separately.

[0160] In the auxiliary gas separation system having the fourth separation membrane module 14, the pipe 28g is connected to the pipe HS1. The pipe HS1 is connected to the vacuum pump 53. The permeated gas from the fourth separation membrane module 14 flows to the vacuum pump 53 side via the pipe 28g.

[0161] In this modified example, the auxiliary gas separation system including the fourth separation membrane module 14 includes pipes 28a-1 and 28a-2 as the seventh flow path. Furthermore, the auxiliary gas separation system including the fourth separation membrane module 14 includes a three-way valve 31k between pipes 28a-1 and 28a-2. In other words, the three-way valve 31k is provided in the seventh flow path of the auxiliary gas separation system. The three-way valve 31k is an example of a "third switching unit." The three-way valve 31k includes a first port 31k1, a second port 31k2, a third port 31k3, and a valve body for switching the ports open and closed.

[0162] The first port 31k1 of the three-way valve 31k is connected to the pipe 28a-1. The second port 31k2 is connected to the pipe 28a-2. The third port 31k3 is connected to the pipe 28c. The pipe 28c is an example of an "eighth flow path." The eighth flow path corresponding to the pipe 28c branches off from the seventh flow path consisting of the pipes 28a-1 and 28a-2 via the three-way valve 31k.

[0163] By operating the valve body of three-way valve 31k and opening the first port 31k1 and the second port 31k2, pipes 28a-1 and 28a-2 are connected, while pipe 28c is closed. This opens the seventh flow path, which includes pipes 28a-1 and 28a-2. Conversely, by operating the valve body of three-way valve 31k and opening the second port 31k2 and the third port 31k3, pipes 28a-1 and 28a-2 are disconnected, while pipes 28a-2 and 28c are connected. This opens the eighth flow path, which includes pipe 28c.

[0164] In the modified example, the first separation membrane module 11 and the fourth separation membrane module 14 are connected via the pipe 22g, the pipe 26a, the pipe 27a, the pipe 28a-1, and the pipe 28a-2.

[0165] The second separation membrane module 12 and the fourth separation membrane module 14 are connected via a pipe 23g, a pipe 26b, a pipe 26c, a pipe 27a, a pipe 28a-1, and a pipe 28a-2.

[0166] The third separation membrane module 13 and the fourth separation membrane module 14 are connected via the pipe 24g, the pipe 26b, the pipe 27a, the pipe 28a-1, and the pipe 28a-2.

[0167] In the auxiliary gas separation system having the fifth separation membrane module 15, the pipe 29g is connected to the pipe HS2. The pipe HS2 is connected to the vacuum pump 53. The permeated gas from the fifth separation membrane module 15 flows to the vacuum pump 53 side via the pipe 29g.

[0168] The auxiliary gas separation system including the fifth separation membrane module 15 includes pipes 29a-1 and 29a-2 as the seventh flow path. Furthermore, the auxiliary gas separation system including the fifth separation membrane module 15 includes a three-way valve 31j between pipes 29a-1 and 29a-2. Specifically, the three-way valve 31j is provided in the seventh flow path of the auxiliary gas separation system. The three-way valve 31j is an example of a "third switching unit." The three-way valve 31j includes a first port 31j1, a second port 31j2, a third port 31j3, and a valve body for switching the opening and closing of each port.

[0169] The first port 31j1 of the three-way valve 31j is connected to the pipe 29a-1. The second port 31j2 is connected to the pipe 29a-2. The third port 31j3 is connected to the pipe 29c. The pipe 29c is an example of an "eighth flow path." The eighth flow path corresponding to the pipe 29c branches off from the seventh flow path consisting of the pipes 29a-1 and 29a-2 via the three-way valve 31j.

[0170] By operating the valve body of three-way valve 31j and opening the first port 31j1 and the second port 31j2, pipes 29a-1 and 29a-2 are connected, while pipe 29c is closed. This opens the seventh flow path, which includes pipes 29a-1 and 29a-2. Conversely, by operating the valve body of three-way valve 31j and opening the second port 31j2 and the third port 31j3, pipes 29a-1 and 29a-2 are disconnected, while pipe 29a-2 is connected to pipe 29c. This opens the eighth flow path, which includes pipe 29c.

[0171] In the modified example, the first separation membrane module 11 and the fifth separation membrane module 15 are connected via the pipe 22g, the pipe 26a, the pipe 27a, the pipe 29a-1, and the pipe 29a-2.

[0172] The second separation membrane module 12 and the fifth separation membrane module 15 are connected via a pipe 23g, a pipe 26b, a pipe 26c, a pipe 27a, a pipe 29a-1, and a pipe 29a-2.

[0173] The third separation membrane module 13 and the fifth separation membrane module 15 are connected via the pipe 24g, the pipe 26b, the pipe 27a, the pipe 29a-1, and the pipe 29a-2.

[0174] Next, refer to Figure 7, the CO2 separation operation of the fourth separation membrane module 14 is described. Figure 7 As shown, three-way valve 31k connects pipe 28a-1 with pipe 28a-2 and closes pipe 28c. This allows permeated gas from at least one of the first separation membrane module 11, the second separation membrane module 12, and the third separation membrane module 13 to be supplied to the fourth separation membrane module 14. At this time, three-way valve 31j can connect pipe 29a-1 with pipe 29a-2 or close them.

[0175] Three-way valve 31h connects pipes 28d and 28f, but blocks pipes 28d and 28e. Retentate gas from the fourth separation membrane module 14 flows through pipes 28d and 28f and is discharged to the outside. Conversely, permeate gas from the fourth separation membrane module 14 flows through pipes 28g and HS1 toward the vacuum pump 53. It should be noted that the vacuum pump 53 can also be connected to a permeate gas storage tank, for example. The permeate gas passing through the vacuum pump 53 can also flow to the storage tank.

[0176] The CO2 separation operation of the fifth separation membrane module 15 will be described. Figure 7 As shown, three-way valve 31j connects pipe 29a-1 with pipe 29a-2 and closes pipe 29c. This allows permeated gas from at least one of the first separation membrane module 11, the second separation membrane module 12, and the third separation membrane module 13 to be supplied to the fifth separation membrane module 15. At this time, three-way valve 31k can connect pipe 28a-1 with pipe 28a-2 or close them.

[0177] Three-way valve 31i connects pipe 29d with pipe 29f and blocks pipe 29d from connecting with pipe 29e. Retentate gas from the fifth separation membrane module 15 flows through pipe 29d and pipe 29f and is discharged to the outside. Conversely, permeate gas from the fifth separation membrane module 15 flows through pipe 29g and pipe HS2 toward the vacuum pump 53. Permeate gas passing through the vacuum pump 53 can also flow to a storage tank.

[0178] Next, refer to Figure 8The cleaning operation of the auxiliary separation membrane module 10S will be described. While the following description uses the example of cleaning the fourth separation membrane module 14 with the retentate gas from the fifth separation membrane module 15, this is not limiting. That is, the fifth separation membrane module 15 can also be cleaned with the retentate gas from the fourth separation membrane module 14. It should be noted that, although not shown in the figure, it is assumed that the fifth separation membrane module 15 is provided with a measuring unit similar to, for example, the measuring units 41a, 41b, and 41c. The measuring unit provided in the fifth separation membrane module 15 outputs measurement signals related to, for example, the pressures in the pipes 29a-2, 29g, and 29d to the control unit 60. Similarly, when cleaning the fourth separation membrane module 14, the fourth separation membrane module 14 is provided with a measuring unit similar to, for example, the measuring units 41a, 41b, and 41c. The measuring unit provided in the fourth separation membrane module 14 outputs measurement signals related to, for example, the pressures in the pipes 28a-2, 28g, and 28d to the control unit 60.

[0179] The detection unit 612 of the control unit 60 detects blockage of the fourth separation membrane module 14 based on the measurement value obtained from the measurement unit. Then, the detection unit 612 outputs control signals to the three-way valves 31h, 31i, 31j, and 31k respectively.

[0180] The three-way valve 31j disconnects the pipe 29a-1 from the pipe 29c and connects the pipe 29a-1 to the pipe 29a-2 according to the control signal from the detection unit 612. Thus, for example, the permeated gas from the first separation membrane module 11 flows to the fifth separation membrane module 15.

[0181] The three-way valve 31i connects pipe 29d and pipe 29e in response to a control signal from the detection unit 612. Furthermore, the three-way valve 31h connects pipe 28d and pipe 28e in response to a control signal from the detection unit 612. This connects pipe 28d, pipe 28e, pipe 25c, pipe 29e, and pipe 29d. Furthermore, the three-way valve 31k connects pipe 28a-2 and pipe 28c in response to a control signal from the detection unit 612. This allows the retentate gas from the fifth separation membrane module 15 to be supplied to the second outflow port 123 of the fourth separation membrane module 14. In other words, the retentate gas from the fifth separation membrane module 15 can flow into the space 110A inside the separation membrane 110 of the fourth separation membrane module 14. This allows the retentate gas from the fifth separation membrane module 15 to clean the fourth separation membrane module 14. Furthermore, the non-permeated gas that has passed through the fourth separation membrane module 14 flows toward the vacuum pump 52 via the pipe 28 a - 2 , the pipe 28 c , the pipe HL3 , the pipe HL4 , and the pipe HL2 .

[0182] Specifically, when cleaning at least the first auxiliary separation membrane module (e.g., the fourth separation membrane module 14) of the auxiliary gas separation system, in the first auxiliary gas separation system, the eighth flow path (e.g., pipe 28c) is opened via the third switching unit (e.g., three-way valve 31k), and the ninth flow path (e.g., pipes 28d and 28e) is opened via the fourth switching unit (e.g., three-way valve 31h). Furthermore, in the second auxiliary gas separation system (e.g., including the fifth separation membrane module 15), the seventh flow path (e.g., pipes 29a-1 and 29a-2) is opened via the third switching unit (e.g., three-way valve 31j), and the ninth flow path (e.g., pipes 29d and 29e) is opened via the fourth switching unit (e.g., three-way valve 31i). Consequently, the non-permeated gas from the second auxiliary gas separation system (e.g., including the fifth separation membrane module 15) flows via the eleventh flow path (e.g., pipe 25c) to the ninth flow path (e.g., pipes 28d and 28e) and the fourth separation membrane module 14.

[0183] [Second embodiment]

[0184] <Overall composition>

[0185] Reference Figure 9 , a configuration example of a gas treatment system 1A according to the second embodiment will be described. Figure 9 This is a schematic diagram illustrating an example of the overall configuration of a gas treatment system 1A according to the second embodiment. Note that in the second embodiment, components identical to those in the first embodiment are designated by the same reference numerals, and descriptions thereof are omitted as appropriate. In the second embodiment, the configuration of the flow path (the thirteenth flow path, described separately) connected to the second outlet 123 of the separation membrane module 10 in each gas separation system differs from that in the first embodiment.

[0186] exist Figure 9 In FIG, although the first separation membrane module 11, the second separation membrane module 12 and the third separation membrane module 13, that is, three separation membrane modules 10 are shown, the number of separation membrane modules 10 is not limited to three. Figure 9 In the figure, two auxiliary separation membrane modules 10S, namely the fourth separation membrane module 14 and the fifth separation membrane module 15, are shown; however, the number of the auxiliary separation membrane modules 10S is not limited thereto.

[0187] like Figure 9 As shown, the first separation membrane module 11 is connected to the ship's engine 100E via a pipe 21 and a flow path comprising pipes 22a and 22b. Combustion exhaust gas discharged from the ship's engine 100E flows through these pipes and reaches the first separation membrane module 11. The flow path comprising pipes 22a and 22b is an example of a "first flow path."

[0188] In addition, the gas separation system having the first separation membrane module 11 is further provided with a pipe 22m branching from the flow path including the pipe 22a and the pipe 22b. The pipe 22m is an example of the "twelfth flow path". In the three-way valve 31a arranged between the pipe 22a and the pipe 22b, the third port 31a3 is connected to the pipe 22m. The three-way valve 31a is an example of the "fifth switching unit". The pipe 22m is connected to the vacuum pump 55 via the pipe EL1 and the pipe EL. The vacuum pump 55 sucks the gas flowing into the pipe 22m. In addition, the vacuum pump 55 discharges the sucked gas to the outside, for example. A filter can be provided in the pipe 22m. It should be noted that the vacuum pump 55 is an example of the "fourth decompression unit".

[0189] By operating the valve body of the three-way valve 31a and opening the first port 31a1 and the second port 31a2, pipes 22a and 22b are connected, while pipe 22m is closed. This opens the first flow path, which includes pipes 22a and 22b. Conversely, by operating the valve body of the three-way valve 31a and opening the second port 31a2 and the third port 31a3, pipes 22a and 22b are disconnected, while pipes 22b and 22m are connected. This opens the twelfth flow path, which includes pipe 22m.

[0190] A pipe 22h is connected to the second outlet 123 of the first separation membrane module 11. Furthermore, the pipe 22h communicates with the atmosphere. The pipe 22h is an example of a "thirteenth flow path." The thirteenth flow path, including the pipe 22h, is always open.

[0191] The second separation membrane module 12 is connected to the ship's engine 100E via pipe 21, pipe 23a, and pipe 23b. Combustion exhaust gas from the ship's engine 100E flows through these pipes and reaches the second separation membrane module 12. The flow path including pipe 23a and pipe 23b is an example of a "first flow path."

[0192] In addition, the gas separation system having the second separation membrane module 12 further includes a pipe 23m branching from the flow path including the pipe 23a and the pipe 23b. The pipe 23m is an example of the "twelfth flow path". A three-way valve 31m can be arranged between the pipe 23a and the pipe 23b. The three-way valve 31m is an example of the "fifth switching unit". The three-way valve 31m includes a first port 31m1, a second port 31m2, a third port 31m3, and a valve body for switching the opening and closing of each port. The first port 31m1 of the three-way valve 31m is connected to the pipe 23a. The second port 31m2 is connected to the pipe 23b. The third port 31m3 is connected to the pipe 23m. The pipe 23m is connected to the vacuum pump 55 via the pipe EL. A filter can be provided in the pipe 23m.

[0193] By operating the valve body of three-way valve 31m and opening first port 31m1 and second port 31m2, pipes 23a and 23b are connected, while pipe 23m is closed. This opens the first flow path, which includes pipes 23a and 23b. Conversely, by operating the valve body of three-way valve 31m and opening second port 31m2 and third port 31m3, pipes 23a and 23b are disconnected, while pipes 23b and 23m are connected. This opens the twelfth flow path, which includes pipe 23m.

[0194] A pipe 23h is connected to the second outlet 123 of the second separation membrane module 12. The pipe 23h communicates with the atmosphere. Note that the pipe 23h is an example of a "thirteenth flow path."

[0195] The third separation membrane module 13 is connected to the ship's engine 100E via pipe 21, pipe 24a, and pipe 24b. Combustion exhaust gas from the ship's engine 100E flows through these pipes and reaches the third separation membrane module 13. The flow path including pipes 24a and 24b is an example of a "first flow path."

[0196] In addition, the gas separation system having the third separation membrane module 13 further includes a pipe 24m branching from the flow path including pipes 24a and 24b. Pipe 24m is an example of a "twelfth flow path." A three-way valve 31n can be arranged between pipes 24a and 24b. Three-way valve 31n is an example of a "fifth switching unit." Three-way valve 31n includes a first port 31n1, a second port 31n2, a third port 31n3, and a valve body for switching the opening and closing of each port. The first port 31n1 of the three-way valve 31n is connected to pipe 24a. The second port 31n2 is connected to pipe 24b. It should be noted that the third port 31n3 is connected to pipe 24m. Pipe 24m is connected to the vacuum pump 55 via pipes EL1 and EL. A filter can be provided in pipe 24m.

[0197] By operating the valve body of three-way valve 31n and opening first port 31n1 and second port 31n2, pipes 24a and 24b are connected, while pipes 24b and 24m are disconnected. This opens the first flow path, which includes pipes 24a and 24b. Conversely, by operating the valve body of three-way valve 31n and opening second port 31n2 and third port 31n3, pipes 24a and 24b are disconnected, while pipes 24b and 24m are connected. This opens the twelfth flow path, which includes pipe 24m.

[0198] A pipe 24h is connected to the second outlet 123 of the third separation membrane module 13. The pipe 24h is in communication with the atmosphere. Note that the pipe 24h is an example of a "thirteenth flow path."

[0199] The fourth separation membrane module 14 is connected to the first separation membrane module 11 via the pipe 22g, the pipe 26a, the pipe 27a, the pipe 28a-1, and the pipe 28a-2. Furthermore, the fourth separation membrane module 14 is connected to the second separation membrane module 12 via the pipe 23g, the pipe 26c, the pipe 26b, the pipe 27a, the pipe 28a-1, and the pipe 28a-2. The fourth separation membrane module 14 is connected to the third separation membrane module 13 via the pipe 24g, the pipe 26b, the pipe 27a, the pipe 28a-1, and the pipe 28a-2.

[0200] A three-way valve 31p may be placed between pipelines 28a-1 and 28a-2. The three-way valve 31p includes a first port 31p1, a second port 31p2, a third port 31p3, and a valve body for switching the ports open and closed. The first port 31p1 of the three-way valve 31p is connected to pipeline 28a-1. The second port 31p2 is connected to pipeline 28a-2. The third port 31p3 is connected to pipeline 28m. Pipeline 28m is connected to the vacuum pump 55 via pipelines EL2 and EL. A filter may be provided in pipeline 28m.

[0201] By operating the valve body of three-way valve 31p and opening the first port 31p1 and the second port 31p2, pipes 28a-1 and 28a-2 are connected, while pipes 28a-2 and 28m are disconnected. This opens the flow path including pipes 28a-1 and 28a-2. Conversely, by operating the valve body of three-way valve 31p and opening the second port 31p2 and the third port 31p3, pipes 28a-1 and 28a-2 are disconnected, while pipes 28a-2 and 28m are connected. This opens the flow path including pipe 28m.

[0202] A pipe 28h is connected to the second outlet 123 of the fourth separation membrane module 14. The pipe 28h is in communication with the atmosphere. Furthermore, a pipe 28g is connected to the first outlet 122 of the fourth separation membrane module 14. Furthermore, the pipe 28g is connected to the vacuum pump 57c via the pipe 27b.

[0203] The fifth separation membrane module 15 is connected to the first separation membrane module 11 via the pipe 22g, the pipe 26a, the pipe 27a, the pipe 29a-1, and the pipe 29a-2. Furthermore, the fifth separation membrane module 15 is connected to the second separation membrane module 12 via the pipe 23g, the pipe 26c, the pipe 26b, the pipe 27a, the pipe 29a-1, and the pipe 29a-2. Furthermore, the fifth separation membrane module 15 is connected to the third separation membrane module 13 via the pipe 24g, the pipe 26b, the pipe 27a, the pipe 29a-1, and the pipe 29a-2.

[0204] A three-way valve 31q can be placed between pipelines 29a-1 and 29a-2. The three-way valve 31q includes a first port 31q1, a second port 31q2, a third port 31q3, and a valve body for switching the ports open and closed. The first port 31q1 of the three-way valve 31q is connected to pipeline 29a-1. The second port 31q2 is connected to pipeline 29a-2. The third port 31q3 is connected to pipeline 29m. Pipeline 29m is connected to the vacuum pump 55 via pipelines EL2 and EL. A filter can be installed in pipeline 29m.

[0205] By operating the valve body of three-way valve 31q and opening the first port 31q1 and the second port 31q2, pipes 29a-1 and 29a-2 are connected, while pipes 29a-2 and 29m are disconnected. This opens the flow path including pipes 29a-1 and 29a-2. Conversely, by operating the valve body of three-way valve 31q and opening the second port 31q2 and the third port 31q3, pipes 29a-1 and 29a-2 are disconnected, while pipes 29a-2 and 29m are connected. This opens the flow path including pipe 29m.

[0206] A pipe 29h is connected to the second outlet 123 of the fifth separation membrane module 15. The pipe 29h communicates with the atmosphere. A pipe 29g is connected to the first outlet 122 of the fifth separation membrane module 15. The pipe 29g is connected to the vacuum pump 57c via the pipe 26d.

[0207] like Figure 9 As shown, the gas treatment system 1A may include a blower 57a, such as a fan, and vacuum pumps 57b and 57c. For example, the blower 57a increases the flow rate of combustion exhaust gas discharged from the ship's engine 100E and flowing to the first separation membrane module 11, the second separation membrane module 12, and the third separation membrane module 13. The blower 57a is, for example, installed in the duct 21. However, the location of the blower 57a is not limited; it can be located upstream of the ship's engine 100E relative to the first separation membrane module 11, the second separation membrane module 12, and the third separation membrane module 13.

[0208] The vacuum pump 57b is preferably located at a position where it can suck the permeated gas from the first separation membrane module 11, the second separation membrane module 12, and the third separation membrane module 13. For example, the vacuum pump 57b is preferably located downstream of the first separation membrane module 11, the second separation membrane module 12, and the third separation membrane module 13, such as in the pipeline 27a. By using the vacuum pump 57b to suck the permeated gas from the first separation membrane module 11, the second separation membrane module 12, and the third separation membrane module 13, the flow rate of the gas supplied to the fourth separation membrane module 14 and the fifth separation membrane module 15 can be increased.

[0209] The vacuum pump 57c is preferably arranged at a position capable of sucking the permeated gas from the fourth separation membrane module 14 and the fifth separation membrane module 15. For example, the vacuum pump 57c is preferably provided downstream of the fourth separation membrane module 14 and the fifth separation membrane module 15 in the pipe 27b or the like.

[0210] <Cleaning Operation of Separation Membrane Module>

[0211] Next, refer to Figure 10 and Figure 11 , the cleaning operation of the separation membrane module 10 performed by the gas treatment system 1A will be described. Figure 10 This is a diagram for explaining the CO 2 separation operation of the separation membrane module 10 . Figure 11 This is a diagram for explaining the cleaning operation of the separation membrane module 10 .

[0212] Taking the first separation membrane module 11 as an example, the cleaning operation of the separation membrane module 10 will be described. However, the same cleaning operation can also be performed on other separation membrane modules 10. Figure 10 The CO 2 separation operation of the first separation membrane module 11 and the flows of the permeated gas and the non-permeated gas generated by the CO 2 separation operation will be described. However, the other separation membrane modules 10 can also perform the same CO 2 separation operation.

[0213] like Figure 10 As shown, the three-way valve 31 a connects the pipe 22 a with the pipe 22 b and closes the pipe 22 m .

[0214] The first separation membrane module 11 separates the combustion exhaust gas into permeated gas and non-permeated gas. The permeated gas flows out of the first outlet 122 of the first separation membrane module 11, passes through pipe 22g, pipe 26a, pipe 27a, pipe 28a-1, and pipe 28a-2, and flows to the fourth separation membrane module 14. Furthermore, the permeated gas from the first separation membrane module 11 can flow out of the first outlet 122 of the first separation membrane module 11, passes through pipe 22g, pipe 26a, pipe 27a, pipe 29a-1, and pipe 29a-2, and flows to the fifth separation membrane module 15. In contrast, the non-permeated gas flows out of the second outlet 123 of the first separation membrane module 11 and passes through pipe 22h. The non-permeated gas from the first separation membrane module 11 is discharged into the atmosphere.

[0215] The CO2 separation operation of the separation membrane modules 10 other than the first separation membrane module 11, and the flow of the permeated gas and non-permeated gas generated by the CO2 separation operation, are the same as those of the first separation membrane module 11. It should be noted that the permeated gas from the fourth separation membrane module 14 and the permeated gas from the fifth separation membrane module 15 may be directed to a storage tank for recovering CO2.

[0216] Next, refer to Figure 11 Next, the cleaning operation of the first separation membrane module 11 will be described. First, the detection unit 612 of the control unit 60 detects blockage of the first separation membrane module 11 based on the measurement values ​​obtained from the measurement units 41a, 41b, and 41c.

[0217] Next, the detection unit 612 outputs a control signal to the three-way valve 31a. Based on the control signal from the detection unit 612, the three-way valve 31a disconnects the pipes 22a and 22b and connects the pipes 22b and 22m. This stops the supply of the combustion exhaust gas to the first separation membrane module 11.

[0218] Furthermore, by making the pipe 22b and the pipe 22m communicate with each other, the pipe 22h, the space 110A inside the separation membrane 110 in the first separation membrane module 11, the pipe 22b, and the pipe 22m communicate with each other.

[0219] Pipe 22m is connected to the vacuum pump 55. Pipe 22h is also connected to the atmosphere. That is, the pressure on the pipe 22m side is lower than the pressure on the pipe 22h side. Therefore, the atmosphere introduced from the flow path including pipe 22h passes through the space 110A inside the separation membrane 110 in the first separation membrane module 11 and flows into the flow path including pipes 22b and 22m. This allows the first separation membrane module 11 to be cleaned.

[0220] By connecting the vacuum pump 55 to the inlet 121 of the first separation membrane module 11 and connecting the pipe 22h connected to the second outlet 123 of the first separation membrane module 11 to the atmosphere, the atmosphere can flow from the second outlet 123 of the first separation membrane module 11 to the inlet 121. This simplifies the structure for cleaning the first separation membrane module 11 while ensuring the cleaning function of the first separation membrane module 11.

[0221] The same applies to the cleaning operation of the separation membrane modules 10 other than the first separation membrane module 11. In the cleaning operation of the separation membrane module 10, although the operation of the three-way valve is controlled by the controller 60, the three-way valve may be operated manually.

[0222] While the embodiments have been described above, these embodiments are provided as examples and the present invention is not limited thereto. The embodiments described above may be implemented in various other forms and may be combined, omitted, replaced, or modified in various ways without departing from the spirit of the invention. These embodiments and their variations are intended to be within the scope and spirit of the invention and are encompassed by the invention as set forth in the claims and their equivalents.

Claims

1. A gas processing system having multiple gas separation systems, The plurality of gas separation systems each have a separation membrane module comprising a separation membrane that selectively permeates CO2 and separates CO2 from the combustion exhaust gas, an inlet for the combustion exhaust gas to flow in, a first outlet for the first permeated gas that has permeated the separation membrane and that is contained in the combustion exhaust gas flowing in from the inlet to flow out, and a second outlet for the non-permeated gas that has not permeated the separation membrane and that is contained in the combustion exhaust gas to flow out; a first flow path connected to the inlet; a first switching portion, provided in the first flow path; a second flow path branching from the first flow path via the first switching portion; a third flow path connected to the second flow outlet; a second switching portion, provided in the third flow path; as well as a fourth flow path branching from the third flow path via the second switching portion; The gas treatment system further includes a fifth flow path connected to the third flow path and connecting the plurality of gas separation systems to each other. When cleaning the separation membrane module of at least the first gas separation system among the plurality of gas separation systems, In the first gas separation system, the second flow path is opened by the first switching unit, and the third flow path is opened by the second switching unit, and In at least the second gas separation system, the first flow path is opened by the first switching unit, and the third flow path is opened by the second switching unit. The non-permeated gas from at least the second gas separation system flows through the fifth flow path to the third flow path and the separation membrane module of the first gas separation system.

2. The gas treatment system according to claim 1, wherein: When cleaning the separation membrane module of at least the first gas separation system, the first flow path is opened by the first switching unit and the third flow path is opened by the second switching unit in the third gas separation system. The non-permeated gas from the third gas separation system flows through the fifth flow path to the third flow path and the separation membrane module of the first gas separation system.

3. The gas treatment system according to claim 1 or 2, further comprising: The compressor compresses the combustion exhaust gas flowing into the inlet of the separation membrane module included in at least the second gas separation system.

4. The gas treatment system according to claim 1 or 2, further comprising: The first decompression unit is connected to at least the second flow path of the first gas separation system.

5. The gas treatment system according to claim 1 or 2, further comprising: The second decompression unit is connected to at least the first outlet of the separation membrane module included in the first gas separation system.

6. The gas treatment system according to claim 1 or 2, further comprising: multiple auxiliary gas separation systems; and The sixth flow path is connected to the first outlet of the separation membrane module of the gas separation system. The plurality of auxiliary gas separation systems each have an auxiliary separation membrane module comprising a separation membrane that selectively permeates CO2 and separates CO2 from the first permeated gas, an inlet for inflow of the first permeated gas, a first outlet for outflow of a second permeated gas that has permeated the separation membrane and that is part of the first permeated gas that has flowed in from the inlet, and a second outlet for outflow of a non-permeated gas that has not permeated the separation membrane and that is part of the first permeated gas; a seventh flow path connected between the sixth flow path and the inlet of the auxiliary separation membrane module; a third switching portion, provided in the seventh flow path; an eighth flow path branching from the seventh flow path via the third switching portion; a ninth flow path connected to the second outflow port of the auxiliary separation membrane module; a fourth switching portion, provided on the ninth flow path; as well as a tenth flow path branching from the ninth flow path via the fourth switching portion, The gas processing system further includes an eleventh flow path connected to the ninth flow path and connecting the plurality of auxiliary gas separation systems to each other. When cleaning the auxiliary separation membrane module of at least the first auxiliary gas separation system among the plurality of auxiliary gas separation systems, In the first auxiliary gas separation system, the eighth flow path is opened by the third switching unit, and the ninth flow path is opened by the fourth switching unit, and In at least the second auxiliary gas separation system, the seventh flow path is opened by the third switching unit, and the ninth flow path is opened by the fourth switching unit. The non-permeated gas from at least the second auxiliary gas separation system flows through the eleventh flow path to the ninth flow path and the auxiliary separation membrane module of the first auxiliary gas separation system.

7. The gas treatment system according to claim 6, comprising: The third decompression unit is connected to the first outlet of the auxiliary separation membrane module.

8. A gas treatment system comprising: a separation membrane module comprising a separation membrane that selectively permeates CO2 and separates CO2 from the combustion exhaust gas, an inlet for the combustion exhaust gas to flow in, a first outlet for the outflow of permeated gas in the combustion exhaust gas that has permeated the separation membrane, and a second outlet for the outflow of non-permeated gas in the combustion exhaust gas that has not permeated the separation membrane; a first flow path connected to the inlet; a fifth switching portion, provided on the first flow path; a twelfth flow path branching from the first flow path via the fifth switching portion; a thirteenth flow path connected to the second flow outlet and in communication with the atmosphere; as well as The fourth decompression unit is connected to the twelfth flow path, When the separation membrane module is to be cleaned, the twelfth flow path is opened by the fifth switching unit, and atmospheric air is introduced into the separation membrane module through the thirteenth flow path.

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