Carbon dioxide gas recovery system and chemical reaction system

Abstract

The present disclosure describes a carbon dioxide gas recovery system and a chemical reaction system capable of achieving conveyance by a mobile body to a plurality of facilities in order to separate and recover a predetermined component in the exhaust gas discharged in the plurality of facilities.　This carbon dioxide gas recovery system comprises: an absorption unit configured so as to cause absorption liquid to absorb carbon dioxide contained in a raw material gas; and a frame body configured to be able to be loaded and unloaded to and from the mobile body. The absorption unit is mounted on the frame body.

Description

Carbon dioxide gas recovery system and chemical reaction system

[0001] The present disclosure relates to carbon dioxide gas capture systems and chemical reaction systems.

[0002] In recent years, in an effort to realize a carbon-neutral society, there has been an increasing demand for the separation and capture of carbon dioxide from exhaust gases generated in large quantities at large-scale facilities (e.g., power plants, cement plants, steel mills, etc.). As a method for separating and capturing carbon dioxide from exhaust gases, various methods have been proposed, including, for example, a chemical absorption method (see Patent Document 1).

[0003] JP 2005-290151 A JP 2023-147631 A

[0004] However, flue gas emitted from large-scale facilities contains various components other than carbon dioxide. Therefore, when actually separating and capturing carbon dioxide from flue gas emitted from a large-scale facility using a separation and capture system, it is necessary to install a test facility of a certain size adjacent to the large-scale facility and conduct tests (e.g., evaluation tests, demonstration tests, etc.) using actual flue gas emitted from the large-scale facility in the test facility. Moreover, in order to conduct tests more appropriately, it is desirable that the height of the carbon dioxide absorption tower in the test facility be approximately the same as the height of the absorption tower of the actual separation and capture system. In addition, since large-scale facilities are located in various places, it would be extremely costly to construct a test facility for each large-scale facility and then dismantle the test facility after the tests are completed.

[0005] Here, Patent Document 2 discloses a carbon dioxide capture system mounted on a mobile body (truck). This carbon dioxide capture system is configured to take in airflow while the mobile body is moving and separate and capture carbon dioxide from the air. However, the system of Patent Document 2 cannot separate and capture carbon dioxide unless the mobile body is moving, so it is not suitable as a test facility for large-scale facilities. Furthermore, although the system of Patent Document 2 is intended 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 capture system on a typical truck.

[0006] Therefore, this disclosure describes a carbon dioxide gas recovery system and a chemical reaction system that can be transported by a mobile vehicle to multiple facilities in order to separate and recover specific components in exhaust gas emitted at the multiple facilities.

[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 able to be loaded onto and unloaded from a mobile body. The absorption unit is mounted on the frame body.

[0008] According to the carbon dioxide gas recovery system and chemical reaction system disclosed herein, it is possible to transport the exhaust gas emitted at multiple facilities by a mobile vehicle in order to separate and recover specific components from the exhaust gas.

[0009] Fig. 1 is a side view schematically showing an example of a carbon dioxide gas recovery system mounted on a mobile body. Fig. 2 is a front view schematically showing a state in which some of a plurality of treatment towers are mounted upright on one frame body, and the remaining portions of a plurality of treatment towers are mounted upright on another frame body, and the one frame body and the other frame body are installed on the ground. Fig. 3 is a diagram schematically showing a treatment unit. Fig. 4 is a block diagram showing an example of main parts of a carbon dioxide gas recovery system.

[0010] In the following description, the same elements or elements having the same functions will be designated by the same reference numerals, and redundant explanations will be omitted. Note that in this specification, when referring to the top, bottom, right, and left of a figure, the directions of the reference numerals in the figure will be used as the reference.

[0011] 1 to 4, a carbon dioxide gas capture system 1 will be described. The carbon dioxide gas capture 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 steelworks, etc.) from, for example, a chimney of the facility and introduce it as a raw material gas, and separate and capture predetermined carbon dioxide gas contained in the raw material gas.

[0012] 1, the carbon dioxide gas capture system 1 is configured to be mountable on a mobile body 2. The mobile 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 traveling 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, 3B, with a portion U1 of the processing unit U mounted on the frame body 3A and a remaining portion U2 of the processing unit U mounted on the frame body 3B. Note that each of the plurality of frame bodies 3 may be loaded onto a different mobile 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 onto or unloaded from the mobile body 2 as a whole.

[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 holders 3d, as illustrated in FIGS. 1 and 2 . The base portion 3a forms the foundation of the frame body 3 and has, for example, a rectangular shape overall. The base portion 3a may be approximately the same size as the platform of the movable body 2, for example, with a long side of approximately 10 m and a short side of approximately 3 m. The support plate 3b is configured to support various elements (e.g., a treatment tower T, described later) that constitute the treatment unit U on its main surface S1. The main surface S1 of the support plate 3b is the surface that faces upward when the support plate 3b is in a sideways position (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 back surface S2 of the support plate 3b when the support plate 3b is in a lying state (described later). The back surface S2 of the support plate 3b is the surface that faces the base portion 3a when the support plate 3b is in a lying state. The plate support portion 3c may support multiple locations on the back surface S2 of the support plate 3b, or may support the back surface S2 of the support plate 3b across its width.

[0017] The pair of rotation holders 3d extend upward from the upper surface of the base portion 3a. The pair of rotation holders 3d may have, for example, a rectangular prism shape. As illustrated in Fig. 1, the pair of rotation holders 3d may be located toward one end of the base portion 3a in the longitudinal direction. The pair of rotation holders 3d are located on both sides of the support plate 3b with the support plate 3b between them.

[0018] The pair of rotation holders 3d rotatably hold the support plate 3b via a rotation shaft. Specifically, the support plate 3b and the various elements of the processing unit U (including the processing tower T) supported by the support plate 3b rotate together around the rotation shaft (see arrow Ar in FIG. 1). Therefore, the support plate 3b and the various elements of the processing unit U (including the processing tower T) supported by the support plate 3b can change their posture between an upright state in which they extend generally vertically and a sideways state in which they extend generally horizontally (a state in which the back surface S2 of the support plate 3b is supported by the plate support portion 3c). Carbon dioxide separation and capture in the processing unit U is performed when the support plate 3b and the various elements of the processing unit U (including the processing tower T) supported by the support plate 3b are in the upright state.

[0019] The position change between the upright state and the lying state may be performed, for example, by lifting or lowering the support plate 3b with a crane or the like. A fastener (not shown) configured to fix the support plate 3b to the base 3a may be used to maintain the upright state of the support plate 3b. The support plate 3b and the various elements of the processing unit U (including the processing tower T) supported by the support plate 3b may be in a lying state when the frame body 3 is loaded onto the platform of the movable body 2. On the other hand, the position change from the lying state to the upright state may be performed after the frame body 3 is removed from the platform of the movable body 2 and fixed to the ground (see FIG. 2 ).

[0020] In the laid-down state, the support plate 3b and the treatment tower T may extend horizontally so that the upper end of the treatment tower T does not tilt downward. In the laid-down state, the tilt of the support plate 3b and the treatment tower T may be, for example, greater than 0° and less than or equal to 10°. In the laid-down state, the overall height of the frame body 3 and the treatment unit U may be approximately 3 m. In the upright state, the overall height of the frame body 3 and the treatment unit U may be approximately 10 m.

[0021] [Treatment Unit] As illustrated in FIG. 3 , the treatment unit U includes a pretreatment section 10, an absorption section 20, a scrubbing section 30, and a regeneration section 40. As described below, the pretreatment section 10, the absorption section 20, the scrubbing section 30, and the regeneration section 40 include a pretreatment tower 11, absorption towers 21 to 24, a scrubbing tower 31, and a regeneration tower 41, respectively. In this specification, these towers may be collectively referred to as a treatment tower T. The treatment tower T is an elongated structure that extends linearly in a predetermined direction. The length of the treatment tower T may be equal to or less than the length of the loading platform of the mobile body 2. The length of the treatment 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 cool the introduced raw material gas as a pretreatment. In the pretreatment tower 11, the raw material gas may be cooled to approximately 30°C to 40°C. The pretreatment tower 11 may be mounted on a frame body 3A, as illustrated in FIG. 2. The interior of the pretreatment tower 11 is filled with packing 11a, such as structured packing or random packing (see FIG. 3). Examples of structured packing include Sulzer packing, Melapack, Flexipak, honeycomb packing, Goodroll packing, and Rombopack. Examples of random packing include Raschig rings and cascade mini rings.

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

[0024] The pump P11 is disposed on the pipe L1a and is configured to operate based on a control signal from the controller Ctr and 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 is configured to operate based on a control signal from the controller Ctr and supply cooling water stored at the bottom of the pretreatment tower 11 to the upper part of the pretreatment tower 11 through the pipe L1b. As a result, the cooling water falls from the upper part of the pretreatment tower 11 to the lower part and circulates back to the upper part of the pretreatment tower 11. The cooling water that falls from the upper part of the pretreatment tower 11 comes into gas-liquid contact with the raw material gas rising through the fillers 11a as it flows down through the fillers 11a. During this gas-liquid contact, the raw material gas is cooled. Although not shown, a removal unit configured to remove SOx, HCl, soot particles, and the like contained in the raw material gas may be provided in the pretreatment tower 11 (for example, below the fillers 11a in the pretreatment tower 11).

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

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

[0028] The absorption towers 21 and 22 may be mounted on a frame body 3A as shown in Fig. 2. The absorption towers 23 and 24 may be mounted on a frame body 3B as shown in Fig. 2. The absorption towers 21 to 24 are respectively filled with, for example, packings 21a to 24a similar to the packing 11a (see Fig. 3). The packings 21a to 24a are configured to promote contact between the raw material gas and the absorbing liquid.

[0029] As illustrated in Fig. 3, one packing 21a is disposed 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 disposed inside the absorption tower 21. In this case, the lengths of the packings 21a may be the same or different.

[0030] As illustrated in Fig. 3, one packing 22a is disposed 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 disposed inside the absorption tower 22. In this case, the lengths of the packings 22a may be the same or different.

[0031] As illustrated in Fig. 3, one packing 23a is disposed 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 disposed inside the absorption tower 23. In this case, the lengths of the packings 23a may be the same or different.

[0032] As illustrated in Fig. 3, one packing 22a is disposed 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 disposed inside the absorption tower 24. In this case, the lengths of the packings 24a may be the same or different.

[0033] Pipe L2a branches off from the downstream end of pipe L1c and is connected to a portion of the absorber 21 below the packing 21a. Pipe L2b branches off from the downstream end of pipe L1c and is connected midway through pipe L2d. Pipe L2c extends from the lower end of the absorber 21 toward the regenerator 41 of the regenerator 40. Pipe L2d is connected from the upper end of the absorber 21 to midway through pipe L2g.

[0034] Pipe L2e branches off from pipe L2d midway and downstream of the junction of pipes L2b and L2d, and is connected to a portion of the absorber 22 below the packing 22a. Pipe L2f is connected from the lower end of the absorber 22 to a portion of the absorber 21 above the packing 21a. Pipe L2g is connected from the upper end of the absorber 22 to a portion of pipe L2j midway.

[0035] Pipe L2h branches off from pipe L2g midway and downstream of the junction of pipes L2d and L2g, and is connected to a portion of the absorber 23 below the packing 23a. Pipe L2i is connected from the lower end of the absorber 23 to a portion of the absorber 22 above the packing 22a. Pipe L2j is connected from the upper end of the absorber 23 to a portion of pipe L2m midway.

[0036] The pipe L2k branches off from the pipe L2j midway and downstream of the junction of the pipes L2g and L2j, and is connected to a portion of the absorber 24 below the packing 24a. The pipe L2l is connected from the lower end of the absorber 24 to a portion of the absorber 23 above the packing 23a. The pipe L2m extends from the upper end of the absorber 24 toward the scrubbing section 30.

[0037] As described above, the absorption tower 22 (first absorption tower) is mounted on the frame body 3A, and the absorption tower 23 (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 mobile bodies 2. In this case, the frame bodies 3A and 3B are each removed from the loading platform of a different mobile body 2 and secured to the ground separately. In this case, if the length of the piping connecting the absorption towers 22 and 23 is fixed, restrictions will arise on the installation of the frame bodies 3A and 3B on the ground. Therefore, the piping connecting the absorption towers 22 and 23 may include an extendable piping FP. In the example of FIG. 2 , the piping L2i (liquid supply section) connecting the lower part of the absorption tower 23 and the upper part of the absorption tower 22 includes an extendable piping FP (liquid supply section).

[0038] 3, the pump P21 is disposed on the pipe L2c. The pump P21 is configured to operate based on a control signal from the controller Ctr and to supply the absorbing liquid stored in the lower end of the absorption tower 21 to the upper end of the regenerator 40 through the pipe L2c.

[0039] The pump P22 is disposed on the pipe L2f and is configured to operate based on a control signal from the controller Ctr and supply the absorbing liquid stored in the lower end of the absorber 22 to the upper end of the absorber 21 through the pipe L2f.

[0040] The pump P23 (liquid delivery unit) is disposed 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 at 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 disposed on the pipe L21. The pump P24 is configured to operate based on a control signal from the controller Ctr and to supply the absorption liquid stored in the lower end of the absorber 24 to the upper end of the absorber 23 through the pipe L21.

[0042] The cooling unit C21 is disposed in the pipe L2f downstream of the pump P22. The cooling unit C21 is configured to exchange heat between the absorbing liquid flowing through the pipe L2f and a cooling liquid, thereby cooling the absorbing liquid. In the cooling unit C21, the absorbing liquid may be cooled to about 35°C.

[0043] The cooling unit C22 is disposed in the pipe L2i downstream of the pump P23. The cooling unit C22 is configured to exchange heat between the absorbing liquid flowing through the pipe L2i and a cooling liquid, thereby cooling the absorbing liquid. In the cooling unit C22, the absorbing liquid may be cooled to about 35°C.

[0044] The cooling unit C23 is disposed in the pipe L21 downstream of the pump P24. The cooling unit C23 is configured to exchange heat between the absorbing liquid flowing through the pipe L21 and a cooling liquid, thereby cooling the absorbing liquid. In the cooling unit C23, the absorbing liquid may be cooled to about 35°C.

[0045] The valves V21 to V28 are respectively disposed on the pipes L2a, L2b, L2d, L2e, L2g, L2h, L2j, and L2k. More specifically, the valve V23 is disposed midway along the pipe L2d and downstream of the branch point of the pipe L2e. More specifically, the valve V25 is disposed midway along the pipe L2g and downstream of the branch point of the pipe L2h. More specifically, the valve V27 is disposed midway along the pipe L2j and downstream of the branch point of the pipe L2k. Each of the valves V21 to V28 operates based on a control signal from the controller Ctr and is configured to be able to open and close between an open state that allows the fluid to flow through the pipes L2a, L2b, L2d, L2e, L2g, L2h, L2j, and L2k, and a closed state that prevents the fluid from flowing.

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

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

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

[0049] The washing liquid is a liquid, such as washing water, that recovers amine, which is a component of the absorption liquid entrained in the decarbonated gas. Although not shown, the washing liquid is supplied from the top of the washing tower 31, drops to the bottom, and circulates back to the top of the washing tower 31. When the washing liquid drops from the top of the washing tower 31 flows down through the packings 31a, it comes into gas-liquid contact with the decarbonated gas rising through the packings 31a. During this gas-liquid contact, the amine is dissolved in the washing liquid and absorbed.

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

[0051] The valves V31 and V32 are disposed on the pipes L3a and L3b, respectively. More specifically, the valve V31 is disposed midway along the pipe L3a and downstream of the branch point of the pipe L3b. The valves V31 and V32 are each operated based on a control signal from the controller Ctr and are configured to be able to open and close between an open state that allows the fluid to flow through the pipes L3a and L3b and a closed state that prevents the fluid from flowing.

[0052] The regeneration unit 40 includes a regeneration tower 41, a heating unit 42, a gas-liquid separation unit 43, pipes L4a-L4h, pumps P41 and P42, a heat exchanger HT, cooling units C41 and C42, and valves V41-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. The regeneration tower 41 is filled with, for example, filler 41a similar to filler 11a. The filler 41a is configured to promote contact between the rich liquid and steam (described below). The downstream end of pipe L2c extending from the lower end of the absorption tower 21 is connected to a portion of the regeneration tower 41 above the filler 41a.

[0053] 3, one packing 41a is disposed inside the regeneration tower 41. A plurality of packings 41a may be disposed inside the regeneration tower 41. In this case, the lengths of the packings 41a may be the same or different.

[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 generate steam by heating the lean liquid after carbon dioxide has been separated from the rich liquid in the regeneration tower 41. The generated steam rises within the regeneration tower 41 and comes into gas-liquid contact with the rich liquid in the packing 41a, heating the rich liquid and separating carbon dioxide from the rich liquid. The steam becomes a carbon dioxide-containing gas containing the 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 the condensed liquid and carbon dioxide (described later) generated in the cooling section C42.

[0056] Pipe L4a is connected from the lower end of the regenerator 41 to the middle of pipe L2f and downstream of the cooling section C21. Pipe L4b branches off from the middle of pipe L4a and is connected to the middle of pipe L2i and downstream of the cooling section C22. Pipe L4c branches off from the middle of pipe L4a upstream of the branch point of pipes L4a and L4b and is connected to the middle of pipe L2l and downstream of the cooling section C23. Pipe L4d branches off from the middle of pipe L4a upstream of the branch point of pipes L4a and L4c and is connected to the upper end of the absorber 24.

[0057] Pipe L4e is connected from the upper end of the regeneration tower 41 to the upper end of the gas-liquid separation unit 43. Pipe L4f is connected from the lower end of the gas-liquid separation unit 43 to the upper end of the regeneration tower 41. Pipe L4g is connected from the upper end of the gas-liquid separation unit 43 to the middle of pipe L1a and upstream of pump P11 and sensor SE11. Pipe L4h branches off from the middle of pipe L4g and upstream of the junction of pipes L4g and L3a. Pipe L4h may be configured to send carbon dioxide gas separated in the gas-liquid separation unit 43 to a recovery device (not shown).

[0058] The pump P41 is disposed on the pipe L4a and is configured to operate based on a control signal from the controller Ctr and supply the lean liquid stored in the lower end of the regenerator 41 to each of the absorption towers 21 to 24 via the pipes L4a to L4d.

[0059] The pump P42 is disposed on the pipe L4 f and is configured to operate based on a control signal from the controller Ctr and return the condensate, from which carbon dioxide has been separated in the gas-liquid separation unit 43, from the gas-liquid separation unit 43 to the regeneration tower 41 via the pipe L4 f.

[0060] The heat exchanger HT is configured to exchange heat between the absorbing solution flowing through the pipe L2c and the lean solution flowing through the pipe L4a. In the heat exchanger HT, the absorbing solution flowing through the pipe L2c is heated by the heat of the lean solution flowing through the pipe L4a. As illustrated in FIG. 3 , the heat exchanger HT may be disposed in the pipe L2c downstream of the pump P21 and in the pipe L4a between the pump P41 and the branch point of the pipes L4a and L4d.

[0061] The cooling unit C41 is disposed in the pipe L4a between the heat exchange unit HT and the branch point of the pipes L4a and L4d. The cooling unit C41 is configured to exchange heat between the lean liquid after the heat exchange in the heat exchange unit HT and the coolant, thereby cooling the lean liquid. In the cooling unit C41, the lean liquid may be cooled to approximately 30°C to 40°C.

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

[0063] Valves V41 to V46 are respectively disposed on pipes L4a to L4d, L4g, and L4h. More specifically, valve V41 is disposed on pipe L4a downstream of the branch point of pipes L4a and L4b. Valve V45 is disposed on pipe L4g between the branch point of pipes L4g and L4h and the junction of pipes L3a and L4g. Each of valves V41 to V46 operates based on a control signal from controller Ctr and is configured to be able to open and close between an open state that allows fluid to flow through pipes L4a to L4d, L4g, and L4h, and a closed state that prevents the flow of the fluid.

[0064] [Controller] As shown in Fig. 4, the controller Ctr (selection unit) has functional modules including a reading unit M1, a memory 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 into multiple modules 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 executing a program, but may also be realized by a dedicated electric circuit (e.g., a logic circuit) or an integrated circuit (ASIC: Application Specific Integrated Circuit) that integrates such a circuit.

[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. The recording medium RM may be, for example, a semiconductor memory, an optical recording disk, a magnetic recording disk, or a magneto-optical recording disk. In this specification, each part of the processing unit U may include, for example, pumps P11, P12, P21 to P24, P41, and P42, valves V21 to V28, V31, V32, and V41 to V46, etc.

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

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

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

[0069] [Adjustment of Carbon Dioxide Concentration in Raw Material Gas] A case will be described in which the controller Ctr controls the valve V31 to open the valve V31 while the valve V32 is closed. In this case, the decarbonated gas obtained after the amine has been absorbed by the washing liquid in the washing tower 31 is introduced through the pipes L3a and 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 decreases.

[0070] On the other hand, a case will be described in which the controller Ctr controls the valve V45 to open it when the valve V46 is closed. In this case, the carbon dioxide 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, the concentration of carbon dioxide in the raw material gas processed in the processing unit U is adjusted depending on the opening and closing of the valves V31 and V45. Therefore, the controller Ctr and the valves V31 and V45 constitute an adjustment unit that adjusts the carbon dioxide concentration in the raw material gas.

[0072] [Selection of Absorption Towers] The controller Ctr controls the valves V21 to V28 and sets the open / close states of the valves V21 to V28 as follows, so that carbon dioxide is separated from the raw material gas 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 pipes L1c and L2a reacts with the absorbing liquid while rising from the lower end to the upper end of the absorption tower 21. The raw material gas that reaches the upper end of the absorption tower 21 is supplied to the lower end of the absorption tower 22 through pipes L2d and L2e, and reacts with the absorbing liquid while rising from the lower end to the upper end of the absorption tower 22. The raw material gas that reaches the upper end of the absorption tower 22 is supplied to the lower end of the absorption tower 23 through pipes L2g and L2h, and reacts with the absorbing liquid while rising from the lower end to the upper end of the absorption tower 23. The raw material gas that reaches the upper end of the absorption tower 23 is supplied to the lower end of the absorption tower 24 through pipes L2j and L2k, and reacts with the absorbing liquid while rising from the lower end to the upper end of the absorption tower 24. In this way, the raw material gas passes through the absorption towers 21 to 24 sequentially, reacts with the absorbing liquid, and is then supplied to the scrubbing tower 31.

[0074] Meanwhile, it is possible to circulate the raw material gas through some of the absorption towers 21 to 24 depending on the open / closed states of the valves V21 to V28 set by the controller Ctr. That is, the controller Ctr and the valves V21 to V28 constitute a selection unit that selects one of the absorption towers 21 to 24 through which the raw material gas is circulated. The correspondence between the open / closed states of the valves V21 to V28 and the selected part of the absorption towers 21 to 24 is listed below.

[0075] When the absorber 21 is selected: Open state: Valves V21, V23, V25, V27; Closed state: Valves V22, V24, V26, V28

[0076] When the absorber 22 is selected: Open state: Valves V22, V24, V25, V27; Closed state: Valves V21, V23, V26, V28

[0077] When the absorber 23 is selected: Open state: Valves V22, V23, V26, V27; Closed state: Valves V21, V24, V25, V28

[0078] When the absorber 24 is selected: Open state: Valves V22, V23, V25, V28; Closed state: Valves V21, V24, V26, V27

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

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

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

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

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

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

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

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

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

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

[0089] 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, 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] Furthermore, the controller Ctr may select all or some of the absorber towers 21 to 24 based on the absorption status acquired by the sensors SE21 to SE24. For example, when the carbon dioxide absorption rates acquired by the sensors SE21 to SE24 indicate a relatively high value, the controller Ctr may select an absorption tower that indicates this relatively high value from among the absorber towers 21 to 24. On the other hand, when the carbon dioxide absorption rates acquired by the sensors SE21 to SE24 indicate a relatively low value, the controller Ctr may not select an absorption tower that indicates this relatively low value from among the absorber towers 21 to 24.

[0091] [Operation] According to the above example, the absorption unit 20 is loaded onto and unloaded from the mobile body 2 together with the frame body 3. Therefore, the absorption unit 20 can be easily moved to multiple facilities by moving the mobile body 2 between multiple facilities. Therefore, in order to separate and recover predetermined components in the exhaust gas emitted at the multiple facilities, it is possible to realize transportation to the multiple facilities by the mobile body 2.

[0092] According to the above example, for example, when the frame body 3 is transported by the mobile body 2, the pre-treatment section 10, the absorption section 20, the scrubbing section 30, and the regeneration section 40 are placed in a sideways position. This makes it less likely for these sections to collide with objects around the mobile body 2 while it is moving, thereby enabling the processing unit U to be transported more safely. Furthermore, for example, after the mobile body 2 arrives at a facility, when separating and recovering predetermined components in the raw material gas discharged from the facility, the pre-treatment section 10, the absorption section 20, the scrubbing section 30, and the regeneration section 40 are placed in an upright position, thereby making it possible to increase the efficiency of separation and recovery.

[0093] According to the above example, the absorption unit 20 includes a plurality of absorption towers 21 to 24, each having packings 21 a to 24 a disposed therein, and therefore the function of the absorption unit 20 is divided among the plurality of absorption towers 21 to 24. This makes the absorption unit 20, which generally tends to be very long, more compact. Therefore, when the absorption unit 20 is mounted on the movable body 2, the absorption unit 20 is less likely to protrude from the movable body 2, and the absorption unit 20 can be transported more safely.

[0094] According to the above example, the controller Ctr controls the open / close states of the valves V21 to V28, thereby selecting an absorption tower from the plurality of absorption towers 21 to 24 through which the raw material gas is passed. Therefore, for example, an absorption tower that can appropriately process the raw material gas is selected from the absorption towers 21 to 24 depending on the conditions of the raw material gas and the absorption towers 21 to 24. This makes it possible to further improve the efficiency of separation and recovery.

[0095] According to the above example, the controller Ctr controls the open / close states of the valves V21 to V28 to select an absorption tower from among the plurality of absorption towers 21 to 24 through which the raw material gas is to flow. Therefore, the flow of the raw material gas to the selected absorption tower is achieved by opening the valves V21 to V28, and the flow of the raw material gas to the non-selected absorption towers is achieved by closing the valves V21 to V28. This makes it possible to more reliably supply the raw material gas to the selected absorption tower.

[0096] According to the above example, the controller Ctr controls the open / close states of the valves V21 to V28, thereby setting the order of the absorption towers through which the raw material gas flows among the plurality of absorption towers 21 to 24. Therefore, for example, the controller Ctr can set the order of the absorption towers 21 to 24 in an order that allows the raw material gas to be appropriately processed depending on the conditions of the raw material gas and the absorption towers, thereby further improving the efficiency of separation and recovery.

[0097] According to the above example, all or some 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 the plurality of absorption towers 21 to 24 depending on the state of the raw material gas (e.g., the flow rate of the raw material gas, the carbon dioxide content in the raw material gas, etc.), an appropriate number of absorption towers for processing the raw material gas are operated. This makes it possible to further improve the efficiency of separation and recovery.

[0098] According to the above example, all or some of the absorption towers 21 to 24 are selected based on the absorption status acquired by the sensors SE21 to SE24. Therefore, for example, by changing the absorption tower selected from the plurality of absorption towers 21 to 24 depending on the quality of the carbon dioxide absorption status among the plurality of absorption towers 21 to 24, an absorption tower suitable for processing the raw material gas is operated. This makes it possible to further improve the efficiency of separation and recovery.

[0099] According to the above example, 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 L2f connecting the lower part of the absorption tower 22 to the upper part of the absorption tower 21. 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 L2i connecting the lower part of the absorption tower 23 to the upper part of the absorption tower 22. 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 through the pipe L2l connecting the lower part of the absorption tower 24 to the upper part of the absorption tower 23. In this case, even if the absorption section 20 is divided into multiple absorption towers 21 to 24, a single long absorption tower in an actual device is simulated. Therefore, in the carbon dioxide gas capture system 1, it is possible to perform carbon dioxide separation and capture processing in an environment that is close to that of an actual separation and capture system.

[0100] According to the above example, the pipe L2i includes the extendable pipe FP. Therefore, when the absorber towers 23 and 24 are installed in the same facility, the absorber tower 22 and the absorber tower 23 can be connected by the extendable pipe FP without having to be precisely positioned. This allows the absorber towers 22 and 23 to be easily installed.

[0101] According to the above example, the concentration of carbon dioxide in the raw material gas processed in the processing unit U is adjusted depending on whether the valves V31 and V45 are open or closed. Therefore, when a predetermined test (e.g., an evaluation test, a demonstration test, etc.) is performed in the carbon dioxide gas recovery system 1, it becomes possible to perform the test under various carbon dioxide concentration conditions. Therefore, the test can be shortened, and the cost of the test can be reduced.

[0102] According to the above example, a portion U1 of the processing unit U is mounted on the frame body 3A, and the remaining portion U2 of the processing unit U is mounted on the frame body 3B. That is, the absorber tower 22 is mounted on the frame body 3A, and the absorber tower 23 is mounted on the frame body 3B. Therefore, for example, the absorber tower 22 mounted on the frame body 3A and the absorber tower 23 mounted on the frame body 3B can each be transported by separate mobile bodies 2. Therefore, even in cases where the absorber towers 22 and 23 cannot be mounted simultaneously on one frame body 3, it is possible to efficiently transport multiple absorber towers.

[0103] According to the above example, the mobile body 2 is a vehicle that can travel on land, so that the processing unit U can be transported between a plurality of facilities at a relatively low cost.

[0104] According to the above example, the length of the treatment tower T is equal to or less than the length of the loading platform of the movable body 2. Therefore, the treatment tower T is unlikely to protrude from the loading platform of the movable body 2, and therefore, when the frame body 3 is transported by the movable body 2, the treatment tower T can be transported more safely.

[0105] [Modifications] The disclosure in this specification should be considered to be illustrative in all respects and not restrictive. Various omissions, substitutions, modifications, etc. may be made to the above examples without departing from the scope and spirit of the claims.

[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 a frame body 3 and the processing unit U may be used.

[0107] (2) The processing unit U may be mounted on the moving body 2 without using the frame body 3. In this case, the processing unit U may be capable of being loaded onto and unloaded from the moving body 2.

[0108] (3) In the above example, the controller Ctr controls the open / close states of the valves V21 to V28 based on data transmitted from the sensors SE11, SE21 to SE24. The controller Ctr also controls the open / close states of the valves V31, V32, and V41 to V46. However, each of the valves V21 to V28, V31, V32, and V41 to V46 may be manually opened and closed by an operator.

[0109] [Other Examples] Example 1. One example of a carbon dioxide gas capture system includes an absorption unit configured to absorb carbon dioxide contained in a feed gas into an absorption liquid, and a frame body configured to be loaded and unloaded onto a mobile body. The absorption unit is mounted on the frame body. In this case, the absorption unit is loaded and unloaded onto and from the mobile body together with the frame body. Therefore, by moving the mobile body between multiple facilities, the absorption unit can be easily moved to multiple facilities. Therefore, in order to separate and capture specific components in exhaust gas emitted at multiple facilities, it is possible to realize transportation to the multiple facilities by the mobile body.

[0110] Example 2. In the carbon dioxide gas capture system of Example 1, the absorption unit may be configured to be able to change its posture relative to the frame body between an upright state in which it extends generally in the vertical direction and a sideways state in which it extends generally in the horizontal direction. In this case, for example, when the frame body is transported by a mobile body, the absorption unit is placed in a sideways state, making it less likely that the absorption unit will collide with objects around the moving mobile body, allowing the absorption unit to be transported more safely. Furthermore, for example, after the mobile body arrives at a facility, when separating and recovering predetermined components in the raw material gas discharged from the facility, the absorption unit is placed in an upright state, making it possible to increase the efficiency of separation and recovery.

[0111] Example 3 In the carbon dioxide gas recovery system of Example 1 or Example 2, the absorption unit may include a plurality of absorption towers, and packing that promotes contact between the raw material gas and the absorption liquid may be disposed inside each of the plurality of absorption towers. In this case, since the absorption unit includes a plurality of absorption towers with packing disposed inside, the function of the absorption unit is divided among the plurality of absorption towers. Therefore, the absorption unit, which generally tends to be very long, is made compact. Therefore, when the absorption unit is mounted on a movable body, the absorption unit is less likely to protrude from the movable body, and the absorption unit can be transported more safely.

[0112] Example 4. The carbon dioxide gas recovery system of Example 3 may further include a selection unit configured to select an absorption tower through which the raw material gas is passed from among the plurality of absorption towers. In this case, for example, the selection unit selects an absorption tower that can appropriately process the raw material gas depending on the conditions of the raw material gas and the absorption towers, thereby making it possible to further increase the efficiency of separation and recovery.

[0113] Example 5. In the carbon dioxide gas recovery system of Example 4, the selection unit may be configured to allow the flow of the raw material gas through a pipe 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. 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 unit may be configured to set the order in which the raw material gas is circulated through selected absorption towers from among the plurality of absorption towers. In this case, the selection unit may set the order of the absorption towers in an order that allows the raw material gas to be appropriately treated, depending on the conditions of the raw material gas and the absorption towers, for example, thereby further improving the efficiency of separation and recovery.

[0115] Example 7. The carbon dioxide gas recovery system of any 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 from the plurality of absorption towers through which the raw material gas is circulated, 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 the plurality of absorption towers depending on the state of the raw material gas (e.g., the flow rate of the raw material gas, the carbon dioxide content in the raw material gas, etc.), an appropriate number of absorption towers for processing the raw material gas are operated. This makes it possible to further improve the efficiency of separation and recovery.

[0116] Example 8. The carbon dioxide gas recovery system of any of Examples 4 to 7 may further include another acquisition unit configured to acquire the carbon dioxide absorption status in the plurality of absorption towers, and the selection unit may be configured to select an absorption tower from the plurality of absorption towers through which the raw material gas is circulated, based on the absorption status acquired by the another acquisition unit. In this case, for example, by changing the absorption tower selected from the plurality of absorption towers depending on whether the carbon dioxide absorption status among the plurality of absorption towers is good or bad, an absorption tower suitable for processing the raw material gas is operated. This makes it possible to further improve the efficiency of separation and recovery.

[0117] Example 9. The carbon dioxide gas recovery system of any of Examples 3 to 8 may further include a liquid delivery unit, and the multiple absorption towers may include a first absorption tower and a second absorption tower, and the liquid delivery unit may be configured to introduce the absorption liquid stored in the lower part of the second absorption tower into the upper part of the first absorption tower. Incidentally, when an actual separation and capture system is installed in a facility, the absorption liquid supplied to the upper end of a single long absorption tower will absorb carbon dioxide as it falls downward. In the case of Example 9, the treated liquid after absorbing carbon dioxide in the second absorption tower is used to absorb carbon dioxide in the first absorption tower. Therefore, even if the absorption unit is divided into multiple absorption towers, a single long absorption tower in an actual system is simulated. Therefore, in the carbon dioxide gas recovery system, it is possible to perform separation and capture processing in an environment similar to that of an actual separation and capture system.

[0118] Example 10 In the carbon dioxide gas recovery system of Example 9, the liquid delivery unit may include an expandable pipe configured to connect the lower part of the second absorption tower and the upper part of the first absorption tower. In this case, when the first and second absorption towers are installed together in a facility, the first absorption tower and the second absorption tower can be connected by the expandable pipe without having to be precisely positioned. This makes it possible to easily install the first and second absorption towers.

[0119] Example 11. Another example of a carbon dioxide gas recovery system includes a regeneration unit configured to separate carbon dioxide from an absorption liquid that has absorbed carbon dioxide contained in a raw material gas, and a frame body configured to be able to be loaded and unloaded onto a mobile body. The regeneration unit is mounted on the frame body. In this case, the regeneration unit is loaded and unloaded onto and from the mobile body together with the frame body. Therefore, by moving the mobile body between multiple facilities, the regeneration unit can be easily moved to multiple facilities. Therefore, in order to separate and recover specific components in exhaust gas emitted at multiple facilities, it is possible to realize transportation by mobile body to the multiple facilities.

[0120] Example 12. Another example of a carbon dioxide gas capture system includes an absorption unit configured to absorb carbon dioxide contained in a feed gas into an absorption liquid, a regeneration unit configured to separate carbon dioxide from the absorption liquid by heating the absorption liquid delivered from the absorption unit, and an adjustment unit configured to supply the carbon dioxide or other gas separated in the regeneration unit to the feed gas and adjust the carbon dioxide concentration in the feed gas. In this case, the carbon dioxide concentration in the feed gas separated and recovered in the carbon dioxide gas capture system is appropriately adjusted by the adjustment unit. Therefore, when performing predetermined tests (e.g., evaluation tests, demonstration tests, etc.) on the carbon dioxide gas capture system, it becomes possible to perform tests under various carbon dioxide concentration conditions. Therefore, the test time can be shortened, and the test costs can be reduced.

[0121] Example 13. Another example of a carbon dioxide gas recovery system includes an absorption unit configured to absorb carbon dioxide contained in a feed gas into an absorption liquid by chemical absorption, and a regeneration unit configured to separate carbon dioxide from the absorption liquid by heating the absorption liquid delivered from the absorption unit. The absorption unit is configured to be able to change its position between an upright state extending generally along the vertical direction and a sideways state extending generally along the horizontal direction. In this case, for example, when the absorption unit is transported by a mobile body, by placing the absorption unit in the sideways state, the absorption unit is less likely to collide with objects around the mobile body while in motion, thereby enabling the absorption unit to be transported more safely. Furthermore, for example, after the mobile body arrives at a facility, when separating and recovering a predetermined component from the feed gas discharged from the facility, by placing the absorption unit in the upright state, the efficiency of separation and recovery can be improved.

[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 sideways state extending generally in the horizontal direction. In this case, for example, when the regeneration unit is transported by a mobile body, the regeneration unit is placed in a sideways state, making it less likely to collide with objects around the moving body, thereby enabling the regeneration unit to be transported more safely. Furthermore, for example, after the mobile body arrives at a facility, when separating and recovering a specific component from the raw material gas discharged from the facility, the regeneration unit is placed in an 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 position between an upright state extending generally along a vertical direction and a sideways state extending generally along a horizontal direction. In this case, the same effects as those of 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 able to be loaded onto and unloaded from a mobile 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 effects as those of Example 1 can be obtained.

[0125] Example 17. The carbon dioxide gas recovery system of Example 16 may further include another frame body configured to be able to be loaded onto and unloaded from another mobile body, and the plurality of absorption towers may include a first absorption tower and a second absorption tower, and the first absorption tower may be mounted on the frame body, and the second absorption tower may be mounted on another frame body. In this case, for example, the first absorption tower mounted on the frame body may be transported by one mobile body, and the second absorption tower mounted on the other frame body may be transported by another mobile body. Therefore, even in a case where the first and second absorption towers cannot be mounted on one frame body at the same time, 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 an upright state in which the plurality of absorption towers extend generally in the vertical direction. In this case, the same effects as those in Example 2 can be obtained.

[0127] Example 19. In the carbon dioxide gas recovery system of any of Examples 16 to 18, the absorption unit may be in a state of lying down so that it extends generally horizontally when the frame body is loaded onto the movable body. In this case, the same effects as those of Example 2 can be obtained.

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

[0129] Example 21. The carbon dioxide gas recovery system of any 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 position between an upright state extending generally along the vertical direction and a sideways state extending generally along the horizontal direction. In this case, the same effects as those of 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 sideways position when the frame body is loaded onto the mobile body. In this case, the same effects as those of Example 14 can be obtained.

[0131] Example 23. The carbon dioxide gas recovery system of any of Examples 16 to 22 further includes a pretreatment unit configured to perform cooling and / or desulfurization of the feed gas as a pretreatment and to supply the pretreated feed 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 along the vertical direction and a sideways state extending generally along the horizontal direction. In this case, for example, when the pretreatment unit is transported by a mobile body, by placing the pretreatment unit in a sideways state, the pretreatment unit is less likely to collide with objects around the mobile body while in motion, thereby enabling the pretreatment unit to be transported more safely. Furthermore, for example, after the mobile body arrives at a facility, when separating and recovering a predetermined component from the feed gas discharged from the facility, by placing the pretreatment unit in an upright state, the efficiency of separation and recovery can be improved.

[0132] Example 24 In the carbon dioxide gas recovery system of Example 23, the pre-treatment unit may be in a sideways position when the frame body is loaded onto the mobile body. In this case, the same effects as those of Example 23 can be obtained.

[0133] Example 25. The carbon dioxide gas recovery system of any of Examples 16 to 24 further includes a scrubbing unit configured to scrub the raw material gas with a scrubbing liquid after carbon dioxide has been absorbed in the absorption unit, and the scrubbing unit may be configured to be able to change its position between an upright state extending generally along the vertical direction and a sideways state extending generally along the horizontal direction. In this case, for example, when the scrubbing unit is transported by a mobile body, by placing the scrubbing unit in a sideways state, the scrubbing unit is less likely to collide with objects around the mobile body while in motion, making it possible to transport the scrubbing unit more safely. Furthermore, for example, when separating and recovering predetermined components in the raw material gas discharged from the facility after the mobile body arrives at the facility, by placing the scrubbing unit in an upright state, it is possible to increase the efficiency of separation and recovery.

[0134] Example 26 In the carbon dioxide gas recovery system of Example 25, the cleaning unit may be in a sideways position when the frame body is loaded onto the mobile body. In this case, the same effects as those of Example 25 can be obtained.

[0135] Example 27. In the carbon dioxide gas recovery system of any of Examples 16 to 26, the length of the plurality of absorption towers may be equal to or less than the length of the loading platform of the mobile body. In this case, the plurality of absorption towers are unlikely to protrude from the loading platform of the mobile body, and therefore, when the frame body is transported by the mobile 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 feed gas into an absorption liquid. The absorption unit is configured to be able to change its position between an upright state extending generally along the vertical direction and a sideways state extending generally along the horizontal direction. In this case, the same effects as those of Example 13 can be obtained.

[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 to 24...absorption towers, 22...absorption tower (first absorption tower), 23...absorption tower (second absorption tower), 21a to 24a...filler, 30...cleaning section, 40...regeneration section, Ctr...controller (adjustment section, selection section), FP...piping (liquid delivery section), L2i...piping (liquid delivery section), P23...pump (liquid delivery section), SE11...sensor (acquisition section), SE21 to SE24...sensors (another acquisition section), U...processing unit, V21 to V28...valves (selection section), V31, V45...valves (adjustment section).

Claims

1. A carbon dioxide gas recovery system comprising: 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 able to be loaded onto and unloaded from a mobile body, wherein the absorption unit is mounted on the frame body.

2. A carbon dioxide gas recovery system as described in claim 1, wherein the absorption section is configured to be able to change its posture relative to the frame body between an upright state in which it extends generally in the vertical direction and a sideways state in which it extends generally in the horizontal direction.

3. The carbon dioxide gas recovery system described in claim 1, wherein the absorption section includes a plurality of absorption towers, and each of the plurality of absorption towers is provided with a packing material that promotes contact between the raw material gas and the absorption liquid.

4. The carbon dioxide gas recovery system according to claim 3, further comprising a selection unit configured to select an absorption tower from among the plurality of absorption towers through which the raw material gas is to flow.

5. The carbon dioxide gas recovery system described in claim 4, wherein the selection unit is configured to allow the flow of the raw material gas through piping connecting selected absorption towers from among the plurality of absorption towers, and to block the flow of the raw material gas to absorption towers from among the plurality of absorption towers that are not selected.

6. A carbon dioxide gas recovery system as described in claim 4, wherein the selection unit is configured to set the order in which the raw material gas is circulated through selected absorption towers from among the plurality of absorption towers.

7. A carbon dioxide gas recovery system as described in claim 4, further comprising an acquisition unit configured to acquire the state of the raw material gas, and the selection unit configured to select an absorption tower from among the plurality of absorption towers through which the raw material gas will flow based on the state of the raw material gas acquired by the acquisition unit.

8. A carbon dioxide gas recovery system as described in claim 4, further comprising another acquisition unit configured to acquire the carbon dioxide absorption status in the plurality of absorption towers, and the selection unit configured to select an absorption tower from the plurality of absorption towers through which the raw material gas will be circulated based on the absorption status acquired by the another acquisition unit.

9. A carbon dioxide gas recovery system as described in claim 3, further comprising a liquid delivery unit, wherein the plurality of absorption towers include a first absorption tower and a second absorption tower, and the liquid delivery unit is configured to introduce the absorption liquid stored in the lower part of the second absorption tower into the upper part of the first absorption tower.

10. A carbon dioxide gas recovery system as described in claim 9, wherein the liquid delivery section includes an expandable 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.

11. A carbon dioxide gas recovery system comprising: a regeneration unit configured to separate carbon dioxide from an absorption liquid that has absorbed carbon dioxide contained in a raw material gas; and a frame body configured to be capable of being loaded onto and unloaded from a mobile body, wherein the regeneration unit is mounted on the frame body.

12. A carbon dioxide gas recovery system comprising: an absorption unit configured to absorb carbon dioxide contained in a raw material gas into an absorption liquid; a regeneration unit configured to separate carbon dioxide from the absorption liquid by heating the absorption liquid sent from the absorption unit; and an adjustment unit configured to supply carbon dioxide or other gas separated in the regeneration unit to the raw material gas and adjust the carbon dioxide concentration in the raw material gas.

13. A carbon dioxide gas recovery system comprising: an absorption unit configured to absorb carbon dioxide contained in a raw material gas into an absorption liquid by chemical absorption; and a regeneration unit configured to separate carbon dioxide from the absorption liquid by heating the absorption liquid sent from the absorption unit, wherein the absorption unit is configured to be able to change its position between an upright state extending generally in a vertical direction and a sideways state extending generally in a horizontal direction.

14. The system according to claim 13, wherein the playback unit is configured to be able to change its posture between an upright state in which it extends generally along the vertical direction and a lying state in which it extends generally along the horizontal direction.

15. A carbon dioxide gas recovery system comprising an absorption unit configured to absorb carbon dioxide contained in a raw material gas into an absorption liquid, the absorption unit including a plurality of absorption towers, each of which is configured to be able to change its position between an upright state extending generally in a vertical direction and a sideways state extending generally in a horizontal direction.

16. A carbon dioxide gas recovery system comprising: 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 capable of being loaded onto and unloaded from a mobile body, wherein the absorption unit includes a plurality of absorption towers, and the plurality of absorption towers are mounted on the frame body.

17. The carbon dioxide gas recovery system described in claim 16, further comprising another frame body configured to be able to be loaded onto and unloaded from another mobile body, wherein the plurality of absorption towers include a first absorption tower and a second absorption tower, the first absorption tower being mounted on the frame body, and the second absorption tower being mounted on the other frame body.

18. A carbon dioxide gas recovery system as described in claim 16, wherein the absorption section is configured to absorb the carbon dioxide contained in the raw material gas into the absorption liquid when the multiple absorption towers are in an upright position extending generally in a vertical direction.

19. A carbon dioxide gas recovery system as described in claim 16, wherein the absorption unit is in a horizontally laid state extending generally horizontally when the frame body is loaded onto the movable body.

20. The carbon dioxide gas recovery system according to claim 16, wherein the mobile body is a vehicle capable of traveling on land.

21. A carbon dioxide gas recovery system as described in claim 16, further comprising a regeneration unit configured to separate carbon dioxide from the absorption liquid by heating the absorption liquid sent from the absorption unit, wherein the regeneration unit is configured to be able to change its position between an upright state extending generally in a vertical direction and a sideways state extending generally in a horizontal direction.

22. A carbon dioxide gas recovery system as described in claim 21, wherein the regeneration unit is in the laid-down state when the frame body is loaded onto the moving body.

23. A carbon dioxide gas recovery system as described in claim 16, further comprising a pre-treatment unit configured to cool and / or desulfurize the raw material gas as a pre-treatment and to supply the raw material gas after the pre-treatment to the absorption unit, wherein the pre-treatment unit is configured to be able to change its position between an upright state extending generally along a vertical direction and a sideways state extending generally along a horizontal direction.

24. A carbon dioxide gas recovery system as described in claim 23, wherein the pre-treatment unit is in the laid-down state when the frame body is loaded onto the moving body.

25. A carbon dioxide gas recovery system as described in claim 16, further comprising a cleaning section configured to clean the raw material gas with a cleaning liquid after carbon dioxide has been absorbed in the absorption section, wherein the cleaning section is configured to be able to change its position between an upright state extending generally along the vertical direction and a sideways state extending generally along the horizontal direction.

26. A carbon dioxide gas recovery system as described in claim 25, wherein the cleaning unit is in the laid-down state when the frame body is loaded onto the moving body.

27. A carbon dioxide gas recovery system according to any one of claims 16 to 26, wherein the length of the plurality of absorption towers is equal to or less than the length of the loading platform of the mobile body.

28. A chemical reaction system comprising an absorption unit configured to absorb a predetermined component contained in a raw material gas into an absorption liquid, wherein the absorption unit is configured to be able to change its position between an upright state in which it extends generally in a vertical direction and a sideways state in which it extends generally in a horizontal direction.

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