Carbon dioxide recovery system

Abstract

To suppress facility cost as much as possible without newly installing a large-sized dedicated facility so as to recover only carbon dioxide, and efficiently recover carbon dioxide.SOLUTION: A carbon dioxide recovery system 10 includes a supply line 11 for supplying air compressed by a compressor 12 to a pneumatic device 13. A carbon dioxide recovery device 15 for separating and recovering carbon dioxide contained in the air compressed by the compressor 12 from air is provided between the compressor 12 in the supply line 11 and the pneumatic device 13. Thus, the carbon dioxide recovery device 15 is provided between the compressor 12 in the supply line 11 which is an existing facility for supplying the air from the compressor 12 to the pneumatic device 13 and the pneumatic device 13. Therefore, the carbon dioxide is recovered by the carbon dioxide recovery device 15, using the air supplied to the pneumatic device 13 through the supply line 11.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a carbon dioxide capture system. [Background technology]

[0002] In recent years, with the promotion of carbon neutrality, it has been considered to separate and capture carbon dioxide contained in air from the air and utilize the captured carbon dioxide in various fields. As a technology for separating and capturing carbon dioxide contained in air from the air (Direct Air Capture), for example, a carbon dioxide capture device described in Patent Document 1 is known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2023-45570 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in the past, a method was adopted in which a large dedicated facility was newly installed from scratch just for the purpose of separating and capturing carbon dioxide contained in the air. Therefore, it is desired to suppress the facility cost as much as possible and capture carbon dioxide efficiently without newly installing a large dedicated facility from scratch just for the purpose of capturing carbon dioxide. [Means for solving the problem]

[0005] Various aspects for solving the above problems will be described below. [Aspect 1] A supply line is provided for supplying the air compressed by the compressor to the pneumatic equipment, A carbon dioxide capture system in which a carbon dioxide capture device is provided between the compressor and the pneumatic equipment in the supply line, the carbon dioxide capture device separating and capturing carbon dioxide contained in the air compressed by the compressor from the air.

[0006] [Aspect 2] The supply line has a conditioning device that removes moisture and foreign matter contained in the air compressed by the compressor, The carbon dioxide capture system according to [Aspect 1], wherein the carbon dioxide capture device is provided between the conditioning device and the pneumatic device in the supply line.

[0007] [Aspect 3] The carbon dioxide capture device has a plurality of separation devices that separate carbon dioxide contained in air from the air, The plurality of separation devices are connected in series, Each of the separation devices is a separation element for separating carbon dioxide contained in the air from the air; a suction pump for sucking the carbon dioxide separated from the air by the separation element, Among the plurality of separation devices, the separation devices other than the separation device located at the most downstream position include A tank for storing the carbon dioxide sucked by the suction pump; a pressure regulating valve for maintaining a constant pressure in the tank and outputting the carbon dioxide in the tank to a separation element of a subsequent separation device; Among the plurality of separation devices, the separation device located at the most downstream side is A carbon dioxide capture system as described in [Aspect 1] or [Aspect 2], which has a storage element that stores carbon dioxide sucked by the suction pump.

[0008] [Aspect 4] The carbon dioxide capture system according to [Aspect 3], wherein the storage element is configured to be detachable from a connecting pipe that connects the suction pump and the storage element.

[0009] [Aspect 5] A carbon dioxide recovery system described in any one of [Aspect 1] to [Aspect 4], wherein the carbon dioxide recovery device separates the carbon dioxide contained in the air from the air by any one of a membrane separation method, a zeolite separation method, or an electrical separation method. Effect of the Invention

[0010] According to this invention, it is possible to efficiently capture carbon dioxide while suppressing equipment costs as much as possible, without having to newly install large-scale equipment dedicated solely to capturing carbon dioxide. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a circuit diagram for explaining a carbon dioxide capture system in an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] An embodiment of the carbon dioxide capture system will be described below with reference to Fig. 1. The carbon dioxide capture system of this embodiment is used in a factory. <Outline of the carbon dioxide capture system> As shown in Fig. 1, a carbon dioxide capture system 10 includes a supply line 11. The supply line 11 supplies air compressed by a compressor 12 to pneumatic equipment 13. The supply line 11 in this embodiment is an existing facility for supplying air compressed by the compressor 12 to pneumatic equipment 13 used in a factory.

[0013] The supply line 11 has a conditioning device 14. The conditioning device 14 removes moisture and foreign matter contained in the air compressed by the compressor 12. A carbon dioxide capture device 15 is provided between the compressor 12 and the pneumatic equipment 13 in the supply line 11. The carbon dioxide capture device 15 is provided between the conditioning device 14 and the pneumatic equipment 13 in the supply line 11. The carbon dioxide capture device 15 separates and captures carbon dioxide contained in the air compressed by the compressor 12 from the air.

[0014] The compressor 12 has an intake port 12a and an exhaust port 12b. The conditioning device 14 has a supply port 14a and an exhaust port 14b. The carbon dioxide capture device 15 has a housing 16. The housing 16 has an inlet 16a and an outlet 16b.

[0015] The carbon dioxide capture system 10 includes a first supply pipe 17, a second supply pipe 18, and a third supply pipe 19. A first end of the first supply pipe 17 is connected to the discharge port 12b of the compressor 12. A second end of the first supply pipe 17 is connected to the supply port 14a of the conditioning device 14. The first supply pipe 17 connects the discharge port 12b of the compressor 12 and the supply port 14a of the conditioning device 14. A first end of the second supply pipe 18 is connected to the discharge port 14b of the conditioning device 14. A second end of the second supply pipe 18 is connected to the inlet 16a of the housing 16. The second supply pipe 18 connects the discharge port 14b of the conditioning device 14 and the inlet 16a of the housing 16. A first end of the third supply pipe 19 is connected to the outlet 16b of the housing 16. A second end of the third supply pipe 19 is connected to the pneumatic device 13. The third supply pipe 19 connects the outlet 16 b of the housing 16 and the pneumatic device 13 .

[0016] The inlet 16a of the housing 16 is configured to be detachable from the second end of the second supply pipe 18. The outlet 16b of the housing 16 is configured to be detachable from the first end of the third supply pipe 19. Therefore, the housing 16 is configured to be detachable from the second supply pipe 18 and the third supply pipe 19.

[0017] The carbon dioxide capture device 15 has a main pipe 20. The main pipe 20 is disposed inside the housing 16. A first end of the main pipe 20 is connected to the inlet 16a of the housing 16. A second end of the main pipe 20 is connected to the outlet 16b of the housing 16. The main pipe 20 connects the inlet 16a and the outlet 16b of the housing 16. The first supply pipe 17, the second supply pipe 18, the main pipe 20, and the third supply pipe 19 constitute the supply line 11.

[0018] <Carbon dioxide capture equipment> The carbon dioxide capture apparatus 15 has a plurality of separation devices 21. Each separation device 21 is disposed inside the housing 16. Each separation device 21 separates carbon dioxide contained in the air compressed by the compressor 12 from the air. In this embodiment, the carbon dioxide capture apparatus 15 has four separation devices 21. In the following description, each of the four separation devices 21 may be referred to as a "first separation device 21A," a "second separation device 21B," a "third separation device 21C," and a "fourth separation device 21D."

[0019] Each separation device 21 has a separation element 22 and a suction pump 23. In each separation device 21, the separation element 22 separates carbon dioxide contained in the air from the air. The separation element 22 separates carbon dioxide contained in the air from the air by membrane separation. Thus, the carbon dioxide capture device 15 separates carbon dioxide contained in the air from the air by membrane separation. The membrane separation is a technique in which air passes through a membrane to filter and extract carbon dioxide. In each separation device 21, the suction pump 23 sucks in the carbon dioxide separated from the air by the separation element 22. Specifically, the suction pump 23 sucks in air with a high proportion of carbon dioxide.

[0020] The separation element 22 of the first separation device 21A is provided in the main pipe 20. The carbon dioxide capture device 15 has a first return pipe 31, a second return pipe 32, and a third return pipe 33. The first return pipe 31, the second return pipe 32, and the third return pipe 33 are arranged inside the housing 16. A first end of the first return pipe 31 is connected to the separation element 22 of the second separation device 21B. A second end of the first return pipe 31 is connected to a portion of the main pipe 20 closer to the outlet 16b than the portion where the separation element 22 of the first separation device 21A is provided. A first end of the second return pipe 32 is connected to the separation element 22 of the third separation device 21C. A second end of the second return pipe 32 is connected to a portion of the main pipe 20 closer to the outlet 16b than the portion where the first return pipe 31 is connected to the first return pipe 31. A first end of the third return pipe 33 is connected to the separation element 22 of the fourth separation device 21D. A second end of the third return pipe 33 is connected to a portion of the main pipe 20 closer to the outlet 16b than the connection point with the second return pipe 32.

[0021] The first separation device 21A, the second separation device 21B, and the third separation device 21C each have a tank 24 and a pressure regulating valve 25. The tank 24 stores the carbon dioxide sucked by the suction pump 23 in each separation device 21. Specifically, the tank 24 stores air containing a high proportion of carbon dioxide. The pressure regulating valve 25 maintains the inside of the tank 24 in each separation device 21 at a constant pressure.

[0022] In the first separation device 21A, the separation element 22 and the suction pump 23 are connected by a first pipe 41. In the first separation device 21A, the suction pump 23 and the tank 24 are connected by a second pipe 42. In the first separation device 21A, the tank 24 and the pressure regulating valve 25 are connected by a third pipe 43.

[0023] In the second separation device 21B, the separation element 22 and the suction pump 23 are connected by a fourth pipe 44. In the second separation device 21B, the suction pump 23 and the tank 24 are connected by a fifth pipe 45. In the second separation device 21B, the tank 24 and the pressure regulating valve 25 are connected by a sixth pipe 46.

[0024] In the third separation device 21C, the separation element 22 and the suction pump 23 are connected by a seventh pipe 47. In the third separation device 21C, the suction pump 23 and the tank 24 are connected by an eighth pipe 48. In the third separation device 21C, the tank 24 and the pressure regulating valve 25 are connected by a ninth pipe 49.

[0025] The fourth separation device 21D has a storage element 26. The storage element 26 is, for example, a tank. The storage element 26 stores the carbon dioxide sucked by the suction pump 23 in the fourth separation device 21D. Specifically, the storage element 26 stores air having a high ratio of carbon dioxide.

[0026] In the fourth separation device 21D, the separation element 22 and the suction pump 23 are connected by a tenth pipe 50. In the fourth separation device 21D, the suction pump 23 and the storage element 26 are connected by an eleventh pipe 51. The eleventh pipe 51 is a connection pipe that connects the suction pump 23 and the storage element 26. The storage element 26 is configured to be detachable from the eleventh pipe 51.

[0027] The pressure regulating valve 25 of the first separation device 21A and the separation element 22 of the second separation device 21B are connected by a first connecting pipe 61. The pressure regulating valve 25 of the second separation device 21B and the separation element 22 of the third separation device 21C are connected by a second connecting pipe 62. The pressure regulating valve 25 of the third separation device 21C and the separation element 22 of the fourth separation device 21D are connected by a third connecting pipe 63. Therefore, the multiple separation devices 21 are connected in series. The fourth separation device 21D is the separation device located at the most downstream position among the multiple separation devices 21. The first separation device 21A, the second separation device 21B, and the third separation device 21C are the separation devices 21 other than the separation device 21 located at the most downstream position among the multiple separation devices 21. The pressure regulating valve 25 outputs carbon dioxide in the tank 24 to the separation element 22 of the next separation device 21.

[0028] [Operation of the embodiment] Next, the operation of this embodiment will be described. The compressor 12 draws in air from the intake port 12a and compresses the drawn air. The air compressed by the compressor 12 is discharged to the first supply pipe 17 through the discharge port 12b. The air discharged to the first supply pipe 17 is supplied to the conditioning device 14 through the supply port 14a. The conditioning device 14 removes moisture and foreign matter contained in the supplied air. The air from which moisture and foreign matter have been removed by the conditioning device 14 flows into the main pipe 20 through the discharge port 14b, the second supply pipe 18, and the inlet 16a.

[0029] The separation element 22 of the first separator 21A separates carbon dioxide contained in the air that flows into the main pipe 20 through the inlet 16a from the air. The air from which carbon dioxide has been separated by the separation element 22 of the first separator 21A flows through the main pipe 20 toward the outlet 16b. On the other hand, the air with a high proportion of carbon dioxide separated from the air by the separation element 22 is sucked by the suction pump 23 of the first separator 21A through the first pipe 41 and is stored in the tank 24 through the second pipe 42. The pressure regulating valve 25 of the first separator 21A outputs the air with a high proportion of carbon dioxide stored in the tank 24 to the separation element 22 of the second separator 21B through the third pipe 43 and the first connecting pipe 61.

[0030] The separation element 22 of the second separation device 21B separates carbon dioxide contained in the air output to the separation element 22 of the second separation device 21B through the first connecting pipe 61 from the air. The air from which carbon dioxide has been separated by the separation element 22 of the second separation device 21B is returned to the main pipe 20 through the first return pipe 31 and flows through the main pipe 20 toward the outlet 16b. On the other hand, the air with a high proportion of carbon dioxide separated from the air by the separation element 22 is sucked by the suction pump 23 of the second separation device 21B through the fourth pipe 44 and stored in the tank 24 through the fifth pipe 45. The pressure regulating valve 25 of the second separation device 21B outputs the air with a high proportion of carbon dioxide stored in the tank 24 to the separation element 22 of the third separation device 21C through the sixth pipe 46 and the second connecting pipe 62.

[0031] The separation element 22 of the third separation device 21C separates carbon dioxide contained in the air output to the separation element 22 of the third separation device 21C from the air via the second connecting pipe 62. The air from which carbon dioxide has been separated by the separation element 22 of the third separation device 21C is returned to the main pipe 20 via the second return pipe 32 and flows through the main pipe 20 toward the outlet 16b. On the other hand, the air with a high proportion of carbon dioxide separated from the air by the separation element 22 is sucked by the suction pump 23 of the third separation device 21C via the seventh pipe 47 and stored in the tank 24 via the eighth pipe 48. The pressure regulating valve 25 of the third separation device 21C outputs the air with a high proportion of carbon dioxide stored in the tank 24 to the separation element 22 of the fourth separation device 21D via the ninth pipe 49 and the third connecting pipe 63.

[0032] The separation element 22 of the fourth separation device 21D separates carbon dioxide contained in the air output to the separation element 22 of the fourth separation device 21D via the third connecting pipe 63 from the air. The air from which carbon dioxide has been separated by the separation element 22 of the fourth separation device 21D is returned to the main pipe 20 via the third return pipe 33 and flows through the main pipe 20 toward the outlet 16b. On the other hand, the air with a high proportion of carbon dioxide separated from the air by the separation element 22 is sucked by the suction pump 23 of the fourth separation device 21D via the tenth pipe 50 and is stored in the storage element 26 via the eleventh pipe 51.

[0033] In this way, the carbon dioxide capture system 10 separates and captures the carbon dioxide contained in the air. Then, the air flowing through the main pipe 20 toward the outlet 16b is supplied to the pneumatic device 13 via the outlet 16b and the third supply pipe 19.

[0034] [Effects of the embodiment] The above embodiment can provide the following effects. (1) A carbon dioxide capture device 15 is provided between the compressor 12 and the pneumatic equipment 13 in a supply line 11, which is an existing facility that supplies air from the compressor 12 to the pneumatic equipment 13. Therefore, carbon dioxide can be captured by the carbon dioxide capture device 15 using the air supplied to the pneumatic equipment 13 via the supply line 11. Therefore, without installing a new large-scale facility dedicated solely to capturing carbon dioxide, it is possible to suppress equipment costs as much as possible and capture carbon dioxide efficiently.

[0035] (2) Since it is desirable that the air supplied to the pneumatic device 13 via the supply line 11 does not contain moisture or foreign matter, the supply line 11 having the purification device 14 is an existing configuration. With this, the carbon dioxide contained in the air after the moisture and foreign matter have been removed by the purification device 14, which is an existing configuration, can be separated and recovered from the air, so that carbon dioxide free of moisture and foreign matter can be efficiently recovered.

[0036] (3) Carbon dioxide contained in air can be repeatedly separated from the air by the multiple separation devices 21. Therefore, carbon dioxide with a high concentration can be recovered. And, the carbon dioxide with a high concentration can be stored in the storage element 26 of the separation device 21 located at the most downstream among the multiple separation devices 21.

[0037] (4) The storage element 26 is configured to be detachable from the eleventh pipe 51, which is a connecting pipe that connects the suction pump 23 and the storage element 26. With this, the storage element 26 in which the highly concentrated carbon dioxide is stored can be moved by removing the storage element 26 from the eleventh pipe 51. Therefore, the highly concentrated carbon dioxide stored in the storage element 26 can be easily utilized in various fields.

[0038] (5) The carbon dioxide capture device 15 separates carbon dioxide contained in the air from the air by membrane separation. This allows carbon dioxide to be separated from the air with less energy than, for example, a method using a chemical absorption method or a physical absorption method in which carbon dioxide is adsorbed by an adsorbent and then separated by applying thermal energy.

[0039] [Example of change] The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other to the extent that no technical contradiction occurs.

[0040] In the embodiment, the number of the separation devices 21 is not particularly limited. In the embodiment, the storage element 26 may be configured so as not to be detachable from the eleventh pipe 51.

[0041] In the embodiment, the separation element 22 may separate the carbon dioxide contained in the air from the air by a zeolite separation method, or may separate the carbon dioxide contained in the air from the air by an electric separation method. In short, the carbon dioxide capture device 15 may separate the carbon dioxide contained in the air from the air by any one of the methods of membrane separation, zeolite separation, or electric separation. This makes it possible to separate the carbon dioxide from the air with less energy than using a method such as a chemical absorption method or a physical absorption method in which carbon dioxide is adsorbed by an adsorbent and then separated by applying thermal energy.

[0042] In an embodiment, the separation element 22 may separate carbon dioxide contained in the air from the air by a method such as chemical absorption or physical absorption, in which the carbon dioxide is adsorbed by an adsorbent and then the carbon dioxide is stripped away by applying thermal energy.

[0043] In the embodiment, the storage element 26 may be, for example, an adsorbent. In short, the storage element 26 may have a configuration capable of storing the carbon dioxide sucked by the suction pump 23 in the fourth separation device 21D.

[0044] In the embodiment, the supply line 11 may not have the conditioning device 14. [Explanation of symbols]

[0045] 10...carbon dioxide capture system, 11...supply line, 12...compressor, 13...pneumatic equipment, 14...conditioning equipment, 15...carbon dioxide capture device, 21...separation device, 22...separation element, 23...suction pump, 24...tank, 25...pressure regulating valve, 26...storage element, 51...11th piping which is connecting piping.

Claims

1. A supply line is provided for supplying the air compressed by the compressor to the pneumatic equipment, A carbon dioxide capture system in which a carbon dioxide capture device is provided between the compressor and the pneumatic equipment in the supply line, the carbon dioxide capture device separating and capturing carbon dioxide contained in the air compressed by the compressor from the air.

2. The supply line has a conditioning device that removes moisture and foreign matter contained in the air compressed by the compressor, The carbon dioxide capture system according to claim 1 , wherein the carbon dioxide capture device is provided in the supply line between the conditioning device and the pneumatic device.

3. The carbon dioxide capture device has a plurality of separation devices that separate carbon dioxide contained in air from the air, The plurality of separation devices are connected in series, Each of the separation devices is a separation element for separating carbon dioxide contained in the air from the air; a suction pump for sucking the carbon dioxide separated from the air by the separation element, Among the plurality of separation devices, the separation devices other than the separation device located at the most downstream position include A tank for storing the carbon dioxide sucked by the suction pump; a pressure regulating valve for maintaining a constant pressure in the tank and outputting the carbon dioxide in the tank to a separation element of a subsequent separation device; Among the plurality of separation devices, the separation device located at the most downstream side is 3. The carbon dioxide capture system according to claim 1, further comprising a storage element for storing the carbon dioxide sucked by the suction pump.

4. The carbon dioxide capture system according to claim 3 , wherein the storage element is configured to be detachable from a connection pipe that connects the suction pump and the storage element.

5. 2. The carbon dioxide capture system according to claim 1, wherein the carbon dioxide capture device separates the carbon dioxide contained in the air from the air by any one of a membrane separation method, a zeolite separation method, and an electrical separation method.

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