Carbon dioxide gas recovery system

Abstract

The present disclosure describes a carbon dioxide gas recovery system and a chemical reaction system capable of realizing transportation by a moving body to a plurality of facilities in order to separate and recover a predetermined component in exhaust gas discharged from the plurality of facilities. 【Solution means】The carbon dioxide gas recovery system includes an absorption unit configured to absorb carbon dioxide contained in the source gas into an absorption liquid, and a frame body configured to be loadable and unloadable with respect to a moving body. The absorption unit is mounted on the frame body.

Description

Technical Field

[0001] The present disclosure relates to a carbon dioxide gas recovery system and a chemical reaction system.

Background Art

[0002] In recent years, in order to achieve a carbon-neutral society, the demand for separating and recovering carbon dioxide in exhaust gas generated in large-scale facilities (for example, power plants, cement factories, steel mills, etc.) has been increasing. As a method for separating and recovering carbon dioxide from exhaust gas, various methods including, for example, a chemical absorption method (see Patent Document 1) have been proposed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the exhaust gas discharged from large-scale facilities contains various components other than carbon dioxide. Therefore, when actually separating and recovering carbon dioxide from the exhaust gas discharged from large-scale facilities by a separation and recovery system, it was necessary to install test equipment of a certain scale beside the large-scale equipment and conduct tests (for example, evaluation tests, demonstration tests, etc.) using the actual exhaust gas discharged from the large-scale facilities in the test equipment. Moreover, in order to conduct the tests more appropriately, it is desirable that the height of the carbon dioxide absorption tower in the test equipment is approximately the same as the height of the absorption tower of the separation and recovery system which is the actual machine. In addition, since large-scale facilities are located everywhere, if test equipment is built for each large-scale facility and the test equipment is disassembled after the tests, it will cost a great deal.

[0005] Here, Patent Document 2 discloses a carbon dioxide recovery system mounted on a moving body (truck). This carbon dioxide recovery system is configured to take in the traveling wind during the travel of the moving body and separate and recover carbon dioxide in the air. However, since the system of Patent Document 2 cannot separate and recover carbon dioxide unless it is traveling, it is not suitable for test facilities for large-scale facilities. Further, although the system of Patent Document 2 is assumed to be mounted on a truck, it is difficult to mount an absorption tower of the same size as the absorption tower of the actual separation and recovery system on a general truck.

[0006] Therefore, the present disclosure describes a carbon dioxide gas recovery system and a chemical reaction system capable of realizing transportation by a moving body to a plurality of facilities in order to separate and recover a predetermined component in exhaust gas discharged from the plurality of facilities.

Means for Solving the Problems

[0007] An example of a carbon dioxide gas recovery system includes an absorption unit configured to absorb carbon dioxide contained in a raw material gas into an absorption liquid, and a frame body configured to be loadable and unloadable with respect to a moving body. The absorption unit is mounted on the frame body.

Effects of the Invention

[0008] According to the carbon dioxide gas recovery system and the chemical reaction system according to the present disclosure, it is possible to realize transportation by a moving body to a plurality of facilities in order to separate and recover a predetermined component in exhaust gas discharged from the plurality of facilities.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0010] In the following description, the same reference numerals are used for the same elements or elements having the same functions, and redundant descriptions are omitted. In this specification, when referring to up, down, right, and left in the drawings, the directions of the reference numerals in the drawings are used as the reference.

[0011] [Carbon Dioxide Gas Recovery System] With reference to FIGS. 1 to 4, the carbon dioxide gas recovery system 1 will be described. The carbon dioxide gas recovery system 1 is configured to extract exhaust gas generated in a facility such as a large-scale facility (for example, a power plant, a cement factory, a steel mill, etc.) from, for example, a chimney of the facility and introduce it as a raw material gas, and separate and recover a predetermined carbon dioxide gas contained in the raw material gas.

[0012] As illustrated in FIG. 1, the carbon dioxide gas recovery system 1 is configured to be loadable on a moving body 2. The moving body 2 may be, for example, a vehicle capable of traveling on land (a trailer in the example of FIG. 1) or a ship capable of navigating on the sea.

[0013] The carbon dioxide gas recovery system 1 includes a frame body 3, a processing unit U mounted on the frame body 3, and a controller Ctr (control unit). The carbon dioxide gas recovery system 1 may include a plurality of frame bodies 3. The processing unit U may include a plurality of parts mounted on each of the plurality of frame bodies 3. In the example of FIG. 2, the carbon dioxide gas recovery system 1 includes two frame bodies 3A and 3B. A part U1 of the processing unit U is mounted on the frame body 3A, and the remaining part U2 of the processing unit U is mounted on the frame body 3B. Note that the plurality of frame bodies 3 may each be loaded on a different moving body 2 and transported.

[0014] [Frame body] The frame body 3 is configured to be able to mount at least a part of the processing unit U. Therefore, the frame body 3 and the processing unit U mounted on the frame body 3 are loaded and unloaded (loaded or unloaded) as a unit with respect to the moving body 2.

[0015] The frame body 3 is made of, for example, metal and includes a base portion 3a, a support plate 3b, a plate support portion 3c, and a pair of rotation holding portions 3d as illustrated in FIGS. 1 and 2. The base portion 3a constitutes the base of the frame body 3 and, for example, has a rectangular shape as a whole. The base portion 3a may have substantially the same size as the loading platform of the moving body 2 and may have, for example, a length of about 10 m for the long side and a length of about 3 m for the short side. The support plate 3b is configured to support various elements (for example, a processing tower T described later) constituting the processing unit U on its main surface S1. Note that the main surface S1 of the support plate 3b is the surface facing upward when the support plate 3b is in a lying-down state (described later).

[0016] The plate support portion 3c extends upward from the upper surface of the base portion 3a. The plate support portion 3c is configured to support the rear surface S2 of the support plate 3b when the support plate 3b is in a lying-down state (described later). Note that the rear surface S2 of the support plate 3b is the surface on the side facing the base portion 3a when the support plate 3b is in the lying-down state. The plate support portion 3c may support a plurality of locations on the rear surface S2 of the support plate 3b, or may support the rear surface S2 of the support plate 3b over its width direction.

[0017] The pair of rotation holding portions 3d extend upward from the upper surface of the base portion 3a. The pair of rotation holding portions 3d may, for example, have a quadrangular prism shape. As illustrated in FIG. 1, the pair of rotation holding portions 3d may be located closer to one end in the longitudinal direction of the base portion 3a. The pair of rotation holding portions 3d are located on both sides of the support plate 3b with the support plate 3b therebetween.

[0018] The pair of rotation holding portions 3d rotatably hold the support plate 3b via a rotation axis. Specifically, the support plate 3b and various elements of the processing unit U supported by the support plate 3b (including the processing tower T) rotate integrally around the rotation axis (see the arrow Ar in FIG. 1). Therefore, the support plate 3b and various elements of the processing unit U supported by the support plate 3b (including the processing tower T) can change their postures between an upright state extending along the vertical direction as a whole and a lying-down state extending along the horizontal direction as a whole (a state in which the rear surface S2 of the support plate 3b is supported by the plate support portion 3c). The separation and recovery of carbon dioxide in the processing unit U are executed when the support plate 3b and various elements of the processing unit U supported by the support plate 3b (including the processing tower T) are in the upright state.

[0019] The change in posture between the standing state and the lying-down state may be executed, for example, by lifting or lowering the support plate 3b with a crane or the like. In order to maintain the standing state of the support plate 3b, a fixture (not shown) configured to fix the support plate 3b to the base portion 3a may be used. The support plate 3b and various elements of the processing unit U supported by the support plate 3b (including the processing tower T) may be in a lying-down state when the frame body 3 is loaded onto the loading platform of the moving body 2. On the other hand, the change in posture from the lying-down state to the standing state may also be executed after lowering the frame body 3 from the loading platform of the moving body 2 and fixing it to the ground (see Fig. 2).

[0020] In the lying-down state, the support plate 3b and the processing tower T may extend along the horizontal direction so that the upper end of the processing tower T does not tilt downward. In the lying-down state, the inclination of the support plate 3b and the processing tower T may be, for example, greater than 0° and less than or equal to 10°. In the lying-down state, the overall height of the frame body 3 and the processing unit U may be about 3 m. In the standing state, the overall height of the frame body 3 and the processing unit U may be about 10 m.

[0021] [Processing Unit] As illustrated in Fig. 3, the processing unit U includes a pretreatment section 10, an absorption section 20, a cleaning section 30, and a regeneration section 40. As will be described later, the pretreatment section 10, the absorption section 20, the cleaning section 30, and the regeneration section 40 each include a pretreatment tower 11, absorption towers 21 to 24, a cleaning tower 31, and a regeneration tower 41. In this specification, these towers may be collectively referred to as the processing tower T. The processing tower T is a long structure that extends linearly in a predetermined direction. The length of the processing tower T may be less than or equal to the length of the loading platform of the moving body 2. The length of the processing tower T may be, for example, 10 m or less.

[0022] The pretreatment unit 10 includes a pretreatment tower 11, pipes L1a to L1c, pumps P11 and P12, and a sensor SE11 (acquisition unit). The pretreatment tower 11 is configured to perform cooling of the introduced raw material gas as pretreatment. In the pretreatment tower 11, the raw material gas may be cooled to about 30°C to 40°C. The pretreatment tower 11 may be mounted on the frame body 3A as illustrated in FIG. 3. Inside the pretreatment tower 11, for example, packing 11a such as regular packing and irregular packing is filled. Examples of regular packing include Sulzer packing, Mellapak, Flexipac, honeycomb packing, Goodroll packing, and Lompack. Examples of irregular packing include Raschig rings and cascade mini rings.

[0023] The pipe L1a is connected to a position below the packing 11a in the pretreatment tower 11. The pipe L1b is connected from the lower end of the pretreatment tower 11 to a position above the packing 11a in the pretreatment tower 11. The pipe L1c extends from the upper end of the pretreatment tower 11 toward the absorption unit 20.

[0024] The pump P11 is disposed on the pipe L1a. The pump P11 operates based on a control signal from the controller Ctr and is configured to supply the raw material gas to the pretreatment tower 11 through the pipe L1a.

[0025] The pump P12 is disposed on the pipe L1b. The pump P12 operates based on a control signal from the controller Ctr and is configured to supply the cooling water stored at the bottom of the pretreatment tower 11 to the upper part of the pretreatment tower 11 through the pipe L1b. Thereby, the cooling water falls from the upper part to the lower part of the pretreatment tower 11 and circulates to the upper part of the pretreatment tower 11 again. When the cooling water falling from the upper part of the pretreatment tower 11 flows down through the packing 11a, it comes into gas-liquid contact with the raw material gas rising through the packing 11a. During this gas-liquid contact, the raw material gas is cooled. Although not shown, a removal unit configured to remove SOx, HCl, dust particles, etc. contained in the raw material gas may be provided inside the pretreatment tower 11 (for example, below the packing 11a in the pretreatment tower 11).

[0026] The sensor SE11 is configured to acquire the state of the raw material gas. The sensor SE11 is configured to transmit the acquired state of the raw material gas to the controller Ctr. The state of the raw material gas acquired by the sensor SE11 may be, for example, the flow rate of the raw material gas, or the concentration, pressure, temperature, etc. of carbon dioxide contained in the raw material gas.

[0027] The absorption unit 20 includes a plurality of absorption towers 21 to 24, pipes L2a to L2m, pumps P21 to P24, cooling units C21 to C23, valves V21 to V28, and sensors SE21 to SE24 (another acquisition unit). Each of the plurality of absorption towers 21 to 24 is configured to absorb carbon dioxide contained in the raw material gas into the absorption liquid by a chemical absorption method. The absorption liquid is a liquid that absorbs carbon dioxide, and is, for example, an aqueous amine solution. The aqueous amine solution may be, for example, an aqueous solution of MEA (monoethanolamine), EAE (ethylaminoethanol), IPAE (isopropanolaminoethanol), and TMDAH (tetramethyldiaminohexane).

[0028] As illustrated in FIG. 2, the absorption towers 21 and 22 may be mounted on the frame body 3A. As illustrated in FIG. 2, the absorption towers 23 and 24 may be mounted on the frame body 3B. Inside each of the absorption towers 21 to 24, for example, packings 21a to 24a similar to the packing 11a are filled. The packings 21a to 24a are configured to promote the contact between the raw material gas and the absorption liquid.

[0029] As illustrated in FIG. 3, one packing 21a is arranged inside the absorption tower 21. The length of the packing 21a inside the absorption tower 21 may be, for example, about 5 m. A plurality of packings 21a may be arranged inside the absorption tower 21. In this case, the lengths of the respective packings 21a may be the same or different.

[0030] As illustrated in FIG. 3, one packing 22a is arranged inside the absorption tower 22. The length of the packing 22a inside the absorption tower 22 may be, for example, about 5 m. A plurality of packings 22a may be arranged inside the absorption tower 22. In this case, the lengths of the respective packings 22a may be the same or different from each other.

[0031] As illustrated in FIG. 3, one packing 23a is arranged inside the absorption tower 23. The length of the packing 23a inside the absorption tower 23 may be, for example, about 5 m. A plurality of packings 23a may be arranged inside the absorption tower 23. In this case, the lengths of the respective packings 23a may be the same or different from each other.

[0032] As illustrated in FIG. 3, one packing 22a is arranged inside the absorption tower 24. The length of the packing 24a inside the absorption tower 24 may be, for example, about 5 m. A plurality of packings 24a may be arranged inside the absorption tower 24. In this case, the lengths of the respective packings 24a may be the same or different from each other.

[0033] The pipe L2a branches from the downstream end of the pipe L1c and is connected to a position below the packing 21a in the absorption tower 21. The pipe L2b branches from the downstream end of the pipe L1c and is connected to the middle of the pipe L2d. The pipe L2c extends from the lower end of the absorption tower 21 toward the regeneration tower 41 of the regeneration unit 40. The pipe L2d is connected to the middle of the pipe L27 from the upper end of the absorption tower 21.

[0034] The pipe L2e branches from the middle of the pipe L2d and from a position downstream of the confluence point of the pipes L2b and L2d, and is connected to a position below the packing 22a in the absorption tower 22. The pipe L2f is connected to a position above the packing 21a in the absorption tower 21 from the lower end of the absorption tower 22. The pipe L2g is connected to the middle of the pipe L2j from the upper end of the absorption tower 22.

[0035] The pipe L2h branches off midway through the pipe L2g and downstream of the confluence point of the pipes L2d and L2g, and is connected to the lower part of the absorption tower 23 below the packing 23a. The pipe L2i is connected from the lower end of the absorption tower 23 to the upper part of the absorption tower 22 above the packing 22a. The pipe L2j is connected from the upper end of the absorption tower 23 to midway through the pipe L2m.

[0036] The pipe L2k branches off midway through the pipe L2j and downstream of the confluence point of the pipes L2g and L2j, and is connected to the lower part of the absorption tower 24 below the two packings 24a. The pipe L2l is connected from the lower end of the absorption tower 24 to the upper part of the absorption tower 23 above the packing 23a. The pipe L2m extends from the upper end of the absorption tower 24 toward the cleaning unit 30.

[0037] By the way, as described above, the absorption tower 22 (the first absorption tower) is mounted on the frame body 3A, and the absorption tower 23 (the second absorption tower) is mounted on the frame body 3B. Therefore, the absorption tower 22 and the absorption tower 23 can be transported by different moving bodies 2. In this case, the frame bodies 3A and 3B are lowered from the loading platforms of different moving bodies 2 and fixed to the ground separately. At this time, if the length of the pipe connecting the absorption towers 22 and 23 is a fixed length, there will be restrictions on the installation of the frame bodies 3A and 3B on the ground. Therefore, the pipe connecting the absorption towers 22 and 23 may include an expandable pipe FP. In the example of FIG. 2, the pipe L2i (liquid supply part) connecting the lower part of the absorption tower 23 and the upper part of the absorption tower 22 includes an expandable pipe FP (liquid supply part).

[0038] The pump P21 is arranged on the pipe L2c. The pump P21 operates based on a control signal from the controller Ctr and is configured to supply the absorption liquid stored at the lower end of the absorption tower 21 to the regeneration unit 40 through the pipe L2c.

[0039] The pump P22 is arranged on the pipe L2f. The pump P22 operates based on a control signal from the controller Ctr, and is configured to supply the absorption liquid stored in the lower end of the absorption tower 22 to the upper end of the absorption tower 21 through the pipe L2f.

[0040] The pump P23 (liquid delivery section) is arranged on the pipe L2i. The pump P23 operates based on a control signal from the controller Ctr, and is configured to supply the absorption liquid stored in the lower end of the absorption tower 23 to the upper end of the absorption tower 22 through the pipe L2i.

[0041] The pump P24 is arranged on the pipe L2l. The pump P24 operates based on a control signal from the controller Ctr, and is configured to supply the absorption liquid stored in the lower end of the absorption tower 24 to the upper end of the absorption tower 23 through the pipe L2l.

[0042] The cooling section C21 is arranged on the downstream side of the pump P22 in the pipe L2f. The cooling section C21 is configured to perform heat exchange between the absorption liquid flowing through the pipe L2f and the cooling liquid, and cool the absorption liquid. In the cooling section C21, the absorption liquid may be cooled to about 35°C.

[0043] The cooling section C22 is arranged on the downstream side of the pump P23 in the pipe L2i. The cooling section C22 is configured to perform heat exchange between the absorption liquid flowing through the pipe L2i and the cooling liquid, and cool the absorption liquid. In the cooling section C22, the absorption liquid may be cooled to about 35°C.

[0044] The cooling section C23 is arranged on the downstream side of the pump P24 in the pipe L2l. The cooling section C23 is configured to perform heat exchange between the absorption liquid flowing through the pipe L2l and the cooling liquid, and cool the absorption liquid. In the cooling section C23, the absorption liquid may be cooled to about 35°C.

[0045] Valves V21 to V28 are respectively arranged on pipes L2a, L2b, L2d, L2e, L2g, L2h, L2j, and L2k. Valves V21 to V28 respectively operate based on control signals from the controller Ctr and are configured to be openable between an open state that allows the flow of fluid in pipes L2a, L2b, L2d, L2e, L2g, L2h, L2j, and L2k and a closed state that blocks the flow of the fluid.

[0046] Sensors SE21 to SE24 (another acquisition unit) are respectively configured to acquire the carbon dioxide absorption status in absorption towers 21 to 24. Sensors SE21 to SE24 are respectively configured to transmit the acquired absorption status to the controller Ctr. The absorption status acquired by sensors SE21 to SE24 may be, for example, the carbon dioxide absorption rate in each of absorption towers 21 to 24.

[0047] The cleaning unit 30 includes a cleaning tower 31, pipes L3a and L3b, and valves V31 and V32. The cleaning tower 31 is configured to clean the raw material gas (deaerated gas) after carbon dioxide is absorbed in the absorption unit 20 with a cleaning liquid. Inside the cleaning tower 31, for example, a packing 31a similar to the packing 11a is filled. The packing 31a is configured to promote the contact between the deaerated gas and the cleaning liquid. Note that the downstream end of the pipe L2m extending from the upper end of the absorption tower 24 is connected to a position below the packing 31a in the cleaning tower 31.

[0048] As illustrated in FIG. 3, one packing 31a is arranged inside the cleaning tower 31. The length of the packing 31a inside the cleaning tower 31 may be, for example, about 5 m. A plurality of packings 31a may be arranged inside the cleaning tower 31. In this case, the lengths of the respective packings 31a may be the same or different.

[0049] The cleaning liquid is a liquid for recovering the amine which is a component of the absorption liquid entrained by the decarbonated gas, and is, for example, cleaning water. Although not shown, the cleaning liquid is supplied from the upper part of the cleaning tower 31, falls to the lower part, and circulates again to the upper part of the cleaning tower 31. When the cleaning liquid falling from the upper part of the cleaning tower 31 flows down the packing 31a, it comes into gas-liquid contact with the decarbonated gas rising through the packing 31a. During this gas-liquid contact, the amine dissolves in and is absorbed by the cleaning liquid.

[0050] The pipe L3a is connected from the upper end of the cleaning tower 31 to the middle of the pipe L4g (described later). The pipe L3b branches off from the middle of the pipe L3a. The pipe L3b is configured to discharge the processed gas from which the amine has been removed in the cleaning tower 31 to the outside of the system. The pipe L3b is connected to, for example, the chimney of the facility, and the processed gas may be returned to the chimney.

[0051] The valves V31 and V32 are respectively arranged on the pipes L3a and L3b. The valves V31 and V32 operate based on control signals from the controller Ctr, and are configured to be openable and closable between an open state that allows the flow of fluid in the pipes L3a and L3b and a closed state that blocks the flow of the fluid.

[0052] The regeneration unit 40 includes a regeneration tower 41, a heating unit 42, a gas-liquid separation unit 43, pipes L4a to L4h, pumps P41 and P42, a heat exchange unit HT, cooling units C41 and C42, and valves V41 to V46. The regeneration tower 41 is configured to separate carbon dioxide from the rich liquid by heating the absorption liquid (rich liquid) in which carbon dioxide contained in the raw material gas has been absorbed. Inside the regeneration tower 41, for example, a packing 41a similar to the packing 11a is filled. The packing 41a is configured to promote the contact between the rich liquid and the vapor (described later). The downstream end of the pipe L2c extending from the lower end of the absorption tower 21 is connected to a position above the packing 41a in the regeneration tower 41.

[0053] As illustrated in FIG. 3, a plurality of packings 41a are arranged inside the regeneration tower 41. At least one packing 41a may be arranged inside the regeneration tower 41. When a plurality of packings 41a are arranged inside the regeneration tower 41, the lengths of the respective packings 41a may be the same or different from each other.

[0054] The heating section 42 is a so-called reboiler and is connected to the lower part of the regeneration tower 41. The heating section 42 is configured to heat the lean liquid after carbon dioxide has been separated from the rich liquid in the regeneration tower 41 to generate steam. The generated steam rises inside the regeneration tower 41 and comes into gas-liquid contact with the rich liquid in the packing 41a to heat the rich liquid and separate carbon dioxide from the rich liquid. The steam becomes a carbon dioxide-containing gas containing carbon dioxide separated from the rich liquid and rises toward the upper end of the regeneration tower 41.

[0055] The gas-liquid separation section 43 is configured to separate carbon dioxide from the condensate (described later).

[0056] The pipe L4a is connected from the lower end of the regeneration tower 41 to a midway point of the pipe L2f and on the downstream side of the cooling section C21. The pipe L4b branches off midway through the pipe L4a and is connected to a midway point of the pipe L2i and on the downstream side of the cooling section C22. The pipe L4c branches off midway through the pipe L4a and upstream of the branch point of the pipes L4a and L4b and is connected to a midway point of the pipe L2l and on the downstream side of the cooling section C23. The pipe L4d branches off midway through the pipe L4a and upstream of the branch point of the pipes L4a and L4c and is connected to the upper end of the absorption tower 24.

[0057] The pipe L4e is connected from the upper end of the regeneration tower 41 to the upper end of the gas-liquid separation section 43. The pipe L4f is connected from the lower end of the gas-liquid separation section 43 to the upper end of the regeneration tower 41. The pipe L4g is connected from the upper end of the gas-liquid separation section 43 to the middle of the pipe L1a and on the upstream side of the pump P11 and the sensor SE11. The pipe L4h branches off in the middle of the pipe L4g. The pipe L4h may be configured to send the carbon dioxide gas separated in the gas-liquid separation section 43 to a recovery device (not shown).

[0058] The pump P41 is arranged on the pipe L4a. The pump P41 operates based on a control signal from the controller Ctr and is configured to supply the lean liquid stored at the lower end of the regeneration tower 41 to each of the absorption towers 21 to 24 through the pipes L4a to L4d.

[0059] The pump P42 is arranged on the pipe L4f. The pump P42 operates based on a control signal from the controller Ctr and is configured to return the condensate from which carbon dioxide has been separated in the gas-liquid separation section 43 to the regeneration tower 41 through the pipe L4f.

[0060] The heat exchange section HT is configured to perform heat exchange between the absorption liquid flowing through the pipe L2c and the lean liquid flowing through the pipe L4a. In the heat exchange section HT, the absorption liquid flowing through the pipe L2c is heated by the heat of the lean liquid flowing through the pipe L4a. The heat exchange section HT may be arranged on the downstream side of the pump P21 in the pipe L2c and between the pump P41 and the branch point of the pipes L4a and L4d in the pipe L4a, as illustrated in FIG. 3.

[0061] The cooling section C41 is arranged between the heat exchange section HT and the branch point of the pipes L4a and L4d in the pipe L4a. The cooling section C41 is configured to perform heat exchange between the lean liquid after heat exchange by the heat exchange section HT and the cooling liquid to cool the lean liquid. In the cooling section C41, the lean liquid may be cooled to about 30°C to 40°C.

[0062] The cooling unit C42 is arranged in the pipe L4e. The cooling unit C42 is configured to perform heat exchange between the carbon dioxide-containing gas flowing through the pipe L4e from the upper end of the regeneration tower 41 and the coolant, and to condense the carbon dioxide-containing gas to generate a condensate.

[0063] The valves V41 to V46 are respectively arranged on the pipes L4a to L4d, L4g, L4h. More specifically, the valve V41 is arranged on the pipe L4a downstream of the branch point of the pipes L4a and L4b. The valve V45 is arranged between the branch point of the pipes L4g and L4h and the confluence point of the pipes L3a and L4g in the pipe L4g. The valves V41 to V46 are each configured to be openable and closable between an open state that allows the flow of fluid in the pipes L4a to L4d, L4g, L4h and a closed state that blocks the flow of the fluid based on a control signal from the controller Ctr.

[0064] [Controller] As illustrated in FIG. 4, the controller Ctr (selection unit) has, as functional modules, a reading unit M1, a storage unit M2, a processing unit M3, and an instruction unit M4. These functional modules are merely a division of the functions of the controller Ctr for convenience, and do not necessarily mean that the hardware constituting the controller Ctr is divided into such modules. Each functional module is not limited to being realized by the execution of a program, and may be realized by a dedicated electric circuit (for example, a logic circuit) or an integrated circuit (ASIC: Application Specific Integrated Circuit) integrating the same.

[0065] The reading unit M1 is configured to read a program from a computer-readable recording medium RM. The recording medium RM stores a program for operating each part of the processing unit U. As the recording medium RM, for example, a semiconductor memory, an optical recording disk, a magnetic recording disk, or a magneto-optical recording disk may be used. In this specification, each part of the processing unit U may include, for example, pumps P11, P12, P21 to P24, P41, P42, valves V21 to V28, V31, V32, V41 to V46, and the like.

[0066] The storage unit M2 is configured to store various data. The storage unit M2 may store, for example, a program read from the recording medium RM by the reading unit M1, setting parameters when operating each part of the processing unit U, setting data input from an operator via an external input device (not shown), and the like. The storage unit M2 may receive and store data acquired by the sensors SE11, SE21 to SE24.

[0067] The processing unit M3 is configured to process various data. The processing unit M3 may be configured to generate an operation signal for operating each part of the processing unit U based on various data stored in the storage unit M2, for example.

[0068] The instruction unit M4 is configured to transmit the operation signal generated by the processing unit M3 to each part of the processing unit U.

[0069] [Adjustment of the Concentration of Carbon Dioxide in the Raw Material Gas] The case where the controller Ctr controls the valve V31 to open it when the valve V32 is in the closed state will be described. In this case, the decarbonated gas after the amine is absorbed into the cleaning liquid in the cleaning tower 31 is introduced into the pipe L1a for supplying the raw material gas to the pretreatment tower 11 through the pipes L3a and L4g. Therefore, the concentration of carbon dioxide in the raw material gas decreases.

[0070] First, when the valve V46 is in the closed state, the case where the controller Ctr controls the valve V45 to open the valve V45 will be described. In this case, the carbon dioxide gas separated in the gas-liquid separation unit 43 is introduced through the pipe L4g into the pipe L1a for supplying the raw material gas to the pretreatment tower 11. Therefore, the concentration of carbon dioxide in the raw material gas increases.

[0071] In this way, according to the opening and closing of the valves V31 and V45, the concentration of carbon dioxide in the raw material gas processed in the processing unit U is adjusted. Therefore, the controller Ctr and the valves V31 and V45 constitute an adjustment unit for adjusting the carbon dioxide concentration in the raw material gas.

[0072] [Selection of Absorption Tower] By the controller Ctr controlling the valves V21 to V28 and setting the opening and closing states of the valves V21 to V28 as follows, the separation process of carbon dioxide from the raw material gas is performed using all of the absorption towers 21 to 24. Open state: Valves V21, V24, V26, V28 Closed state: Valves V22, V23, V25, V27

[0073] At this time, the raw material gas supplied from the pretreatment unit 10 to the lower end of the absorption tower 21 through the pipes L1c and L2a reacts with the absorption liquid while rising from the lower end to the upper end of the absorption tower 21. The raw material gas reaching the upper end of the absorption tower 21 is supplied to the lower end of the absorption tower 22 through the pipes L2d and L2e, and reacts with the absorption liquid while rising from the lower end to the upper end of the absorption tower 22. The raw material gas reaching the upper end of the absorption tower 22 is supplied to the lower end of the absorption tower 23 through the pipes L2g and L2h, and reacts with the absorption liquid while rising from the lower end to the upper end of the absorption tower 23. The raw material gas reaching the upper end of the absorption tower 23 is supplied to the lower end of the absorption tower 24 through the pipes L2j and L2k, and reacts with the absorption liquid while rising from the lower end to the upper end of the absorption tower 24. In this way, the raw material gas sequentially passes through the absorption towers 21 to 24, reacts with the absorption liquid, and then is supplied to the washing tower 31.

[0074] On the one hand, according to the setting of the opening and closing states of valves V21 to V28 by the controller Ctr, it is possible to circulate the raw material gas through a part of the absorption towers 21 to 24. That is, the controller Ctr and the valves V21 to V28 constitute a selection unit that selects the absorption tower through which the raw material gas circulates among the absorption towers 21 to 24. Hereinafter, the correspondence between the opening and closing states of the valves V21 to V28 and the selected part of the absorption towers 21 to 24 is listed.

[0075] · When absorption tower 21 is selected Open state: Valves V21, V23, V25, V27 Closed state: Valves V22, V24, V26, V28

[0076] · When absorption tower 22 is selected Open state: Valves V22, V24, V25, V27 Closed state: Valves V21, V23, V26, V28

[0077] · When absorption tower 23 is selected Open state: Valves V22, V23, V26, V27 Closed state: Valves V21, V24, V25, V28

[0078] · When absorption tower 24 is selected Open state: Valves V22, V23, V25, V28 Closed state: Valves V21, V24, V26, V27

[0079] · When absorption towers 21 and 22 are selected Open state: Valves V21, V24, V25, V27 Closed state: Valves V22, V23, V26, V28

[0080] · When absorption towers 21 and 23 are selected Open state: Valves V21, V23, V26, V27 Closed state: Valves V22, V24, V25, V28

[0081] · When absorption towers 21 and 24 are selected Open state: Valves V21, V23, V25, V28 Closed state: Valves V22, V24, V26, V27

[0082] · When absorption towers 22 and 23 are selected Open state: Valves V22, V24, V26, V27 Closed state: Valves V21, V23, V25, V28

[0083] · When absorption towers 22 and 24 are selected Open state: Valves V22, V24, V25, V28 Closed state: Valves V21, V23, V26, V27

[0084] · When absorption towers 23 and 24 are selected Open state: Valves V22, V23, V26, V28 Closed state: Valves V21, V24, V25, V27

[0085] · When absorption towers 21 to 23 are selected Open state: Valves V21, V24, V26, V27 Closed state: Valves V22, V23, V25, V28

[0086] · When absorption towers 21, 22, and 24 are selected Open state: Valves V21, V24, V25, V28 Closed state: Valves V22, V23, V26, V27

[0087] · When absorption towers 21, 23, and 24 are selected Open state: Valves V21, V23, V26, V28 Closed state: Valves V22, V24, V25, V27

[0088] · When absorption towers 22 to 24 are selected Open state: Valves V22, V24, V26, V28 Closed state: Valves V21, V23, V25, V27

[0089] Incidentally, the controller Ctr may select all or some of the absorption towers 21 to 24 based on the state of the raw material gas acquired by the sensor SE11. For example, when the flow rate of the raw material gas acquired by the sensor SE11 is relatively high or when the concentration of carbon dioxide contained in the raw material gas is relatively high, the controller Ctr may select a relatively large number of absorption towers from among the absorption towers 21 to 24. On the other hand, for example, when the flow rate of the raw material gas acquired by the sensor SE11 is relatively low or when the concentration of carbon dioxide contained in the raw material gas is relatively low, the controller Ctr may select a relatively small number of absorption towers from among the absorption towers 21 to 24.

[0090] Further, the controller Ctr may select all or some of the absorption towers 21 to 24 based on the absorption status acquired by the sensors SE21 to SE24. For example, when the carbon dioxide absorption rate acquired by the sensors SE21 to SE24 shows a relatively high value, the controller Ctr may select the absorption tower showing the relatively high value from among the absorption towers 21 to 24. On the other hand, for example, when the carbon dioxide absorption rate acquired by the sensors SE21 to SE24 shows a relatively low value, the controller Ctr may not select the absorption tower showing the relatively low value from among the absorption towers 21 to 24.

[0091] [Function] According to the above example, the absorption unit 20 is loaded and unloaded with respect to the moving body 2 together with the frame body 3. Therefore, by moving the moving body 2 between a plurality of facilities, the absorption unit 20 can be easily moved to the plurality of facilities. Accordingly, it becomes possible to realize the conveyance by the moving body 2 to the plurality of facilities in order to separate and recover a predetermined component in the exhaust gas discharged in the plurality of facilities.

[0092] According to the above example, for instance, when the frame body 3 is transported by the moving body 2, the pre-treatment unit 10, the absorption unit 20, the cleaning unit 30, and the regeneration unit 40 are in a lying-down state. Therefore, it is difficult for these to collide with the objects around the moving body 2 during movement, so it becomes possible to transport the processing unit U more safely. Also, for example, after the moving body 2 arrives at the facility, when separating and recovering a predetermined component in the raw material gas discharged from the facility, by setting the pre-treatment unit 10, the absorption unit 20, the cleaning unit 30, and the regeneration unit 40 in an upright state, it becomes possible to increase the efficiency of separation and recovery.

[0093] According to the above example, since the absorption unit 20 includes a plurality of absorption towers 21 to 24 in which fillers 21a to 24a are respectively arranged inside, the function as the absorption unit 20 is divided among the plurality of absorption towers 21 to 24. Therefore, the absorption unit 20, which generally tends to have a long length, is made compact. Thus, when the absorption unit 20 is mounted on the moving body 2, it becomes difficult for the absorption unit 20 to protrude from the moving body 2, so it becomes possible to transport the absorption unit 20 more safely.

[0094] According to the above example, by the controller Ctr controlling the opening and closing states of the valves V21 to V28, the absorption tower through which the raw material gas flows among the plurality of absorption towers 21 to 24 is selected. Therefore, for example, according to the situation of the raw material gas and the absorption towers 21 to 24, the absorption tower that can appropriately process the raw material gas among the absorption towers 21 to 24 is selected. Thus, it becomes possible to further increase the efficiency of separation and recovery.

[0095] According to the above example, by the controller Ctr controlling the opening and closing states of the valves V21 to V28, the absorption tower through which the raw material gas flows among the plurality of absorption towers 21 to 24 is selected. Therefore, the flow of the raw material gas to the selected absorption tower is realized by the opening of the valves V21 to V28, and the flow of the raw material gas to the non-selected absorption towers is realized by the closing of the valves V21 to V28. Therefore, it becomes possible to more surely supply the raw material gas to the selected absorption tower.

[0096] According to the above example, by the controller Ctr controlling the opening and closing states of the valves V21 to V28, the order of the absorption towers 21 to 24 through which the raw material gas flows among the plurality of absorption towers is set. Therefore, for example, according to the situation of the raw material gas and the absorption towers, by the controller Ctr setting the order of the absorption towers 21 to 24 in an appropriate order for processing the raw material gas, it becomes possible to further improve the separation and recovery efficiency.

[0097] According to the above example, all or part of the absorption towers 21 to 24 are selected based on the state of the raw material gas acquired by the sensor SE11. Therefore, by changing the number of absorption towers selected from among the plurality of absorption towers 21 to 24 according to the state of the raw material gas (for example, the flow rate of the raw material gas, the carbon dioxide content rate in the raw material gas, etc.), the number of absorption towers suitable for processing the raw material gas operates. Therefore, it becomes possible to further improve the separation and recovery efficiency.

[0098] According to the above example, all or part of the absorption towers 21 to 24 are selected based on the absorption situation acquired by the sensors SE21 to SE24. Therefore, for example, by changing the absorption towers selected from among the plurality of absorption towers 21 to 24 according to the quality of the carbon dioxide absorption situation among the plurality of absorption towers 21 to 24, the absorption towers suitable for processing the raw material gas operate. Therefore, it becomes possible to further improve the separation and recovery efficiency even more.

[0099] According to the above example, through the pipe L2f connecting the lower part of the absorption tower 22 and the upper part of the absorption tower 21, the absorption liquid stored at the lower end of the absorption tower 22 is supplied to the upper end of the absorption tower 21 by the pump P22. Through the pipe L2i connecting the lower part of the absorption tower 23 and the upper part of the absorption tower 22, the absorption liquid stored at the lower end of the absorption tower 23 is supplied to the upper end of the absorption tower 22 by the pump P23. Through the pipe L2l connecting the lower part of the absorption tower 24 and the upper part of the absorption tower 23, the absorption liquid stored at the lower end of the absorption tower 24 is supplied to the upper end of the absorption tower 23 by the pump P24. In this case, even when the absorption section 20 is divided into a plurality of absorption towers 21 to 24, a single long absorption tower in the actual machine is simulated. Therefore, in the carbon dioxide gas recovery system 1, it is possible to perform the separation and recovery process of carbon dioxide in an environment close to the actual separation and recovery system.

[0100] According to the above example, the pipe L2i includes an expandable pipe FP. Therefore, when the absorption towers 23 and 24 are installed in the facility, the two can be connected by the expandable pipe FP without precisely positioning the absorption tower 22 and the absorption tower 23. Therefore, the absorption towers 22 and 23 can be easily installed.

[0101] According to the above example, according to the opening and closing of the valves V31 and V45, the concentration of carbon dioxide in the raw material gas processed in the processing unit U is adjusted. Therefore, when a predetermined test (for example, an evaluation test, a demonstration test, etc.) is carried out in the carbon dioxide gas recovery system 1, tests under various carbon dioxide concentration conditions can be carried out. Therefore, the test can be shortened, and the cost of the test can be reduced.

[0102] According to the above example, a part U1 of the processing unit U is mounted on the frame body 3A, and the remaining part U2 of the processing unit U is mounted on the frame body 3B. That is, the absorption tower 22 is mounted on the frame body 3A, and the absorption tower 23 is mounted on the frame body 3B. Therefore, for example, the absorption tower 22 mounted on the frame body 3A and the absorption tower 23 mounted on the frame body 3B can each be transported by a separate moving body 2. Accordingly, even when it is not possible to mount the absorption towers 22 and 23 on one frame body 3 at the same time, it is possible to efficiently transport a plurality of absorption towers.

[0103] According to the above example, the moving body 2 is a vehicle capable of traveling on land. Therefore, it is possible to realize the transportation of the processing unit U between a plurality of facilities at a relatively low cost.

[0104] According to the above example, the length of the processing tower T is equal to or less than the length of the loading platform of the moving body 2. Therefore, since it is difficult for the processing tower T to protrude from the loading platform of the moving body 2, it is possible to transport the processing tower T more safely when the frame body 3 is transported by the moving body 2.

[0105] [Modification Example] The disclosure in this specification should be considered illustrative in all respects and not restrictive. Various omissions, substitutions, changes, etc. may be made to the above example without departing from the scope of the claims and their gist.

[0106] (1) The processing unit U may be configured to separate and recover other components such as sulfur oxides from the raw material gas in addition to or instead of carbon dioxide in the raw material gas. That is, instead of the carbon dioxide gas recovery system 1, a chemical reaction system including the frame body 3 and the processing unit U may be provided.

[0107] (2) The processing unit U may be mounted on the moving body 2 without passing through the frame body 3. In this case, the processing unit U may be configured to be loadable and unloadable with respect to the moving body 2.

[0108] (3) In the above example, based on the data transmitted from the sensors SE11, SE21 to SE24, the controller Ctr controlled the opening and closing states of the valves V21 to V28. Also, the controller Ctr controlled the opening and closing states of the valves V31, V32, V41 to V46. However, for each of the valves V21 to V28, V31, V32, V41 to V46, an operator may manually open and close them.

[0109] [Another example] Example 1. An example of a carbon dioxide gas recovery system includes an absorption unit configured to absorb carbon dioxide contained in a raw material gas into an absorption liquid, and a frame body configured to be loadable and unloadable with respect to a moving body. The absorption unit is mounted on the frame body. In this case, the absorption unit is loaded and unloaded with respect to the moving body together with the frame body. Therefore, by moving the moving body between a plurality of facilities, the absorption unit can be easily moved to the plurality of facilities. Accordingly, it becomes possible to realize the conveyance of the moving body to the plurality of facilities in order to separate and recover a predetermined component in the exhaust gas discharged from the plurality of facilities.

[0110] Example 2. In the carbon dioxide gas recovery system of Example 1, the absorption unit may be configured to be able to change its posture between an upright state extending generally along the vertical direction and a lying-down state extending generally along the horizontal direction with respect to the frame body. In this case, for example, when the frame body is conveyed by the moving body, the absorption unit is in the lying-down state, so that it is difficult for the absorption unit to collide with an object around the moving moving body, and thus the absorption unit can be conveyed more safely. Also, for example, after the moving body arrives at the facility, when separating and recovering a predetermined component in the raw material gas discharged from the facility, the absorption unit is in the upright state, so that the efficiency of separation and recovery can be increased.

[0111] Example 3. In the carbon dioxide gas recovery system of Example 1 or Example 2, the absorption section may include a plurality of absorption towers, and fillers for promoting the contact between the raw material gas and the absorption liquid may be arranged inside each of the plurality of absorption towers. In this case, since the absorption section includes a plurality of absorption towers in which fillers are arranged inside, the function as the absorption section is divided among the plurality of absorption towers. Therefore, the absorption section, which generally tends to have a long length, is made compact. Thus, when the absorption section is mounted on a moving body, it becomes difficult for the absorption section to protrude from the moving body, so that the absorption section can be transported more safely.

[0112] Example 4. The carbon dioxide gas recovery system of Example 3 may further include a selection section configured to select an absorption tower through which the raw material gas flows among the plurality of absorption towers. In this case, for example, depending on the raw material gas and the situation of the absorption towers, by selecting an absorption tower that can appropriately process the raw material gas by the selection section, it becomes possible to further improve the efficiency of separation and recovery.

[0113] Example 5. In the carbon dioxide gas recovery system of Example 4, the selection section may be configured to allow the flow of the raw material gas in the pipes connecting the selected absorption towers among the plurality of absorption towers, and to block the flow of the raw material gas to the absorption towers not selected among the plurality of absorption towers. In this case, it becomes possible to more reliably supply the raw material gas to the selected absorption tower.

[0114] Example 6. In the carbon dioxide gas recovery system of Example 4 or Example 5, the selection section may be configured to set the order in which the raw material gas flows through the selected absorption towers among the plurality of absorption towers. In this case, for example, depending on the raw material gas and the situation of the absorption towers, by setting the order of the absorption towers by the selection section in an appropriate order for processing the raw material gas, it becomes possible to further improve the efficiency of separation and recovery.

[0115] Example 7. Any of the carbon dioxide gas recovery systems of Examples 4 to 6 may further include an acquisition unit configured to acquire the state of the raw material gas, and the selection unit may be configured to select an absorption tower through which the raw material gas flows among a plurality of absorption towers based on the state of the raw material gas acquired by the acquisition unit. In this case, by changing the number of absorption towers selected from among the plurality of absorption towers according to the state of the raw material gas (for example, the flow rate of the raw material gas, the carbon dioxide content rate in the raw material gas, etc.), the number of absorption towers suitable for the treatment of the raw material gas operates. Therefore, it is possible to further improve the separation and recovery efficiency.

[0116] Example 8. Any of the carbon dioxide gas recovery systems of Examples 4 to 7 may further include another acquisition unit configured to acquire the carbon dioxide absorption status in a plurality of absorption towers, and the selection unit may be configured to select an absorption tower through which the raw material gas flows among the plurality of absorption towers based on the absorption status acquired by the other acquisition unit. In this case, for example, by changing the absorption tower selected from among the plurality of absorption towers according to the quality of the carbon dioxide absorption status in the plurality of absorption towers, an absorption tower suitable for the treatment of the raw material gas operates. Therefore, it is possible to further improve the separation and recovery efficiency even more.

[0117] Example 9. Any of the carbon dioxide gas recovery systems of Examples 3 to 8 may further include a liquid feeding unit, the plurality of absorption towers include a first absorption tower and a second absorption tower, and the liquid feeding unit may be configured to introduce the absorption liquid stored in the lower part of the second absorption tower to the upper part of the first absorption tower. By the way, when installing the actual separation and recovery system in a facility, the absorption liquid supplied to the upper end of one long absorption tower will absorb carbon dioxide while falling downward. In the case of Example 9, the treatment liquid after absorbing carbon dioxide in the second absorption tower is used for the absorption of carbon dioxide in the first absorption tower. Therefore, even when the absorption part is divided into a plurality of absorption towers, one long absorption tower in the actual machine is simulated. Therefore, in the carbon dioxide gas recovery system, it is possible to execute the separation and recovery process in an environment close to the actual separation and recovery system.

[0118] Example 10. In the carbon dioxide gas recovery system of Example 9, the liquid feeding section may include a flexible pipe configured to connect the lower part of the second absorption tower and the absorption liquid to the upper part of the first absorption tower. In this case, when the first and second absorption towers are installed in the facility, the first and second absorption towers can be connected by the flexible pipe without precisely positioning them. Therefore, the first and second absorption towers can be easily installed.

[0119] Example 11. Another example of the carbon dioxide gas recovery system includes a regeneration section configured to separate carbon dioxide from the absorption liquid in which carbon dioxide contained in the raw material gas is absorbed, and a frame body configured to be loadable and unloadable with respect to the moving body. The regeneration section is mounted on the frame body. In this case, the regeneration section is loaded and unloaded with respect to the moving body together with the frame body. Therefore, by moving the moving body between a plurality of facilities, the regeneration section can be easily moved to a plurality of facilities. Thus, it becomes possible to realize the conveyance of the moving body to the plurality of facilities in order to separate and recover a predetermined component in the exhaust gas discharged from the plurality of facilities.

[0120] Example 12. Another example of the carbon dioxide gas recovery system includes an absorption section configured to absorb carbon dioxide contained in the raw material gas into the absorption liquid, a regeneration section configured to separate carbon dioxide from the absorption liquid by heating the absorption liquid fed from the absorption section, and an adjustment section configured to supply the carbon dioxide or other gas separated in the regeneration section to the raw material gas to adjust the carbon dioxide concentration in the raw material gas. In this case, the carbon dioxide concentration in the raw material gas separated and recovered in the carbon dioxide gas recovery system is appropriately adjusted by the adjustment section. Therefore, when conducting a predetermined test (for example, an evaluation test, a demonstration test, etc.) in the carbon dioxide gas recovery system, it becomes possible to conduct tests under various carbon dioxide concentration conditions. Thus, the test can be shortened, and it becomes possible to reduce the test cost.

[0121] Example 13. Another example of a carbon dioxide gas recovery system includes an absorption unit configured to absorb carbon dioxide contained in a raw material gas into an absorption liquid by a chemical absorption method, and a regeneration unit configured to separate carbon dioxide from the absorption liquid by heating the absorption liquid fed from the absorption unit. The absorption unit is configured to be able to change its posture between an upright state extending generally in the vertical direction and a lying-down state extending generally in the horizontal direction. In this case, for example, when the absorption unit is transported by a moving body, the absorption unit is placed in the lying-down state, making it difficult for the absorption unit to collide with objects around the moving body during movement, so that the absorption unit can be transported more safely. Also, for example, after the moving body arrives at a facility, when separating and recovering a predetermined component in the raw material gas discharged from the facility, the absorption unit is placed in the upright state, making it possible to increase the efficiency of separation and recovery.

[0122] Example 14. In the carbon dioxide gas recovery system of Example 13, the regeneration unit may be configured to be able to change its posture between an upright state extending generally in the vertical direction and a lying-down state extending generally in the horizontal direction. In this case, for example, when the regeneration unit is transported by a moving body, the regeneration unit is placed in the lying-down state, making it difficult for the regeneration unit to collide with objects around the moving body during movement, so that the regeneration unit can be transported more safely. Also, for example, after the moving body arrives at a facility, when separating and recovering a predetermined component in the raw material gas discharged from the facility, the regeneration unit is placed in the upright state, making it possible to increase the efficiency of separation and recovery.

[0123] Example 15. Another example of a carbon dioxide gas recovery system includes an absorption unit configured to absorb carbon dioxide contained in a raw material gas into an absorption liquid. The absorption unit includes a plurality of absorption towers. Each of the plurality of absorption towers is configured to be able to change its posture between an upright state extending generally in the vertical direction and a lying-down state extending generally in the horizontal direction. In this case, the same operational effects as in Example 13 can be obtained.

[0124] Example 16. Another example of a carbon dioxide gas recovery system includes an absorption unit configured to absorb carbon dioxide contained in a raw material gas into an absorption liquid, and a frame body configured to be loadable and unloadable with respect to a moving body. The absorption unit includes a plurality of absorption towers. The plurality of absorption towers are mounted on the frame body. In this case, the same operational effects as in Example 1 can be obtained.

[0125] Example 17. The carbon dioxide gas recovery system of Example 16 further includes another frame body configured to be loadable and unloadable with respect to another moving body. The plurality of absorption towers include a first absorption tower and a second absorption tower. The first absorption tower is mounted on the frame body, and the second absorption tower may be mounted on the other frame body. In this case, for example, the first absorption tower mounted on the frame body can be transported by one moving body, and the second absorption tower mounted on the other frame body can be transported by another moving body. Therefore, even in a case where the first and second absorption towers cannot be simultaneously mounted on one frame body, it is possible to efficiently transport the plurality of absorption towers.

[0126] Example 18. In the carbon dioxide gas recovery system of Example 16 or Example 17, the absorption unit may be configured to absorb carbon dioxide contained in the raw material gas into the absorption liquid in a standing state in which the plurality of absorption towers extend entirely along the vertical direction. In this case, the same operational effects as in Example 2 can be obtained.

[0127] Example 19. In the carbon dioxide gas recovery system according to any one of Examples 16 to 18, the absorption unit may be in a lying state extending entirely along the horizontal direction when being loaded onto the moving body of the frame body. In this case, the same operational effects as in Example 2 can be obtained.

[0128] Example 20. In the carbon dioxide gas recovery system according to any one of Examples 16 to 19, the moving body may be a vehicle capable of traveling on land. In this case, it is possible to realize the transportation of the absorption unit between a plurality of facilities at a relatively low cost.

[0129] Example 21. Any one of the carbon dioxide gas recovery systems of Examples 16 to 20 further includes a regeneration unit configured to separate carbon dioxide from the absorption liquid by heating the absorption liquid sent from the absorption unit, and the regeneration unit may be configured to be able to change its posture between an upright state extending generally in the vertical direction and a lying-down state extending generally in the horizontal direction. In this case, the same operational effects as in Example 14 can be obtained.

[0130] Example 22. In the carbon dioxide gas recovery system of Example 21, the regeneration unit may be in a lying-down state when loaded on the moving body of the frame body. In this case, the same operational effects as in Example 14 can be obtained.

[0131] Example 23. Any one of the carbon dioxide gas recovery systems of Examples 16 to 22 further includes a pretreatment unit configured to perform cooling and / or desulfurization of the raw material gas as a pretreatment and supply the pretreated raw material gas to the absorption unit, and the pretreatment unit may be configured to be able to change its posture between an upright state extending generally in the vertical direction and a lying-down state extending generally in the horizontal direction. In this case, for example, when the pretreatment unit is transported by the moving body, the pretreatment unit being in a lying-down state makes it difficult for the pretreatment unit to collide with the objects around the moving moving body during movement, so that the pretreatment unit can be transported more safely. Also, for example, after the moving body arrives at the facility, when separating and recovering a predetermined component in the raw material gas discharged from the facility, the pretreatment unit being in an upright state makes it possible to improve the efficiency of separation and recovery.

[0132] Example 24. In the carbon dioxide gas recovery system of Example 23, the pretreatment unit may be in a lying-down state when loaded on the moving body of the frame body. In this case, the same operational effects as in Example 23 can be obtained.

[0133] Example 25. Any one of the carbon dioxide gas recovery systems of Examples 16 to 24 further includes a cleaning unit configured to clean the raw material gas after carbon dioxide is absorbed in the absorption unit with a cleaning liquid. The cleaning unit may be configured to be able to change its posture between an upright state extending generally in the vertical direction and a lying-down state extending generally in the horizontal direction. In this case, for example, when the cleaning unit is transported by a moving body, the cleaning unit is placed in the lying-down state, so that it is difficult for the cleaning unit to collide with an object around the moving moving body during movement, and thus the cleaning unit can be transported more safely. Also, for example, after the moving body arrives at the facility, when separating and recovering a predetermined component in the raw material gas discharged from the facility, the cleaning unit is placed in the upright state, so that the efficiency of separation and recovery can be increased.

[0134] Example 26. In the carbon dioxide gas recovery system of Example 25, the cleaning unit may be in the lying-down state when loaded on the moving body of the frame body. In this case, the same operational effects as in Example 25 can be obtained.

[0135] Example 27. In any one of the carbon dioxide gas recovery systems of Examples 16 to 26, the lengths of the plurality of absorption towers may be equal to or less than the length of the loading platform of the moving body. In this case, since it is difficult for the plurality of absorption towers to protrude from the loading platform of the moving body, when the frame body is transported by the moving body, the plurality of absorption towers can be transported more safely.

[0136] Example 28. An example of a chemical reaction system includes an absorption unit configured to absorb a predetermined component contained in a raw material gas with an absorption liquid. The absorption unit is configured to be able to change its posture between an upright state extending generally in the vertical direction and a lying-down state extending generally in the horizontal direction. In this case, the same operational effects as in Example 13 can be obtained.

Explanation of Reference Numerals

[0137] 1… Carbon dioxide gas recovery system, 2… Mobile body, 3, 3A, 3B… Frame body, 10… Pretreatment section, 11… Pretreatment tower, 20… Absorption section, 21 - 24… Absorption towers, 22… Absorption tower (first absorption tower), 23… Absorption tower (second absorption tower), 21a - 24a… Packing materials, 30… Cleaning section, 40… Regeneration section, Ctr… Controller (adjusting section, selecting section), FP… Pipe (liquid feeding section), L2i… Pipe (liquid feeding section), P23… Pump (liquid feeding section), SE11… Sensor (acquisition section), SE21 - SE24… Sensors (other acquisition sections), U… Processing unit, V21 - V28… Valves (selecting section), V31, V45… Valves (adjusting section).

Claims

1. A plurality of absorption towers configured to absorb carbon dioxide contained in the raw material gas into an absorption liquid; a selection unit configured to select an absorption tower through which the raw material gas is to flow from among the plurality of absorption towers, A carbon dioxide gas recovery system, wherein the plurality of absorption towers and the selection unit are mountable on a mobile body.

2. The carbon dioxide gas recovery system according to claim 1, wherein each of the plurality of absorption towers is configured to be capable of changing its posture between an upright state in which it extends generally along a vertical direction and a laid-down state in which it extends generally along a horizontal direction.

3. 3. The carbon dioxide gas recovery system according to claim 1, wherein the selection unit is configured to allow the flow of the raw material gas through piping connecting selected absorption towers among the plurality of absorption towers, and to block the flow of the raw material gas to absorption towers not selected among the plurality of absorption towers.

4. The carbon dioxide gas recovery system according to claim 1 or 2, wherein the selection unit is configured to set an order in which the raw material gas is circulated through the selected absorption tower from among the plurality of absorption towers.

5. An acquisition unit configured to acquire a state of the source gas, The carbon dioxide gas recovery system according to claim 1 or 2, wherein the selection unit is configured to select an absorption tower from among the plurality of absorption towers through which the raw gas is circulated, based on the state of the raw gas acquired by the acquisition unit.

6. Further comprising another acquisition unit configured to acquire the carbon dioxide absorption status in the plurality of absorption towers, The carbon dioxide gas recovery system according to claim 1 or 2, wherein the selection unit is configured to select an absorption tower through which the raw gas flows from among the plurality of absorption towers, based on an absorption status acquired by the other acquisition unit.

7. Further comprising a liquid delivery section, The plurality of absorption towers include a first absorption tower and a second absorption tower, The carbon dioxide gas recovery system according to claim 1 or 2, wherein the liquid delivery section is configured to introduce the absorption liquid stored in a lower portion of the second absorption tower into an upper portion of the first absorption tower.

8. The carbon dioxide gas recovery system according to claim 7 , wherein the liquid delivery section includes an expandable pipe configured to connect a lower portion of the second absorption tower and the absorption liquid to an upper portion of the first absorption tower.

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