Carbon dioxide capture system

Abstract

To provide a carbon dioxide collection system capable of collecting even carbon dioxide generating from a movable body, and also to provide the movable body.SOLUTION: A carbon dioxide collection system comprises: an absorption tower site 31 for obtaining a carbon dioxide-rich absorption liquid 3 by making carbon dioxide absorb in a carbon dioxide-lean absorption liquid 4; a regeneration tower site 32 for recovering the above carbon dioxide-lean liquid by desorbing the carbon dioxide from the carbon dioxide-rich liquid; a first movable body 33 conveying the carbon dioxide-rich liquid stored in a first storage part from the absorption tower site to the regeneration tower site; a second movable body 34 conveying the carbon dioxide-lean liquid stored in a second storage part from the regeneration tower site to the absorption tower site; a first absorption part absorbing the carbon dioxide generating from the first movable body in the carbon dioxide-rich liquid stored in the first storage part; and a second absorption part absorbing the carbon dioxide generating from the second movable body in the carbon dioxide-lean liquid store in the second storage part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a capture system, mobile, for capturing carbon dioxide from a gaseous carbon dioxide source. [Background technology]

[0002] In response to the recent demand for reductions in carbon dioxide emissions in response to global warming, methods for separating and recovering carbon dioxide from gaseous carbon dioxide sources emitted from equipment such as blast furnaces, lime kilns, heating furnaces, reactors, and boilers at power plants, steel mills, cement plants, refineries, and chemical plants, as well as from the atmosphere, are available.

[0003] A typical method for recovering carbon dioxide in a gaseous carbon dioxide supply source includes an absorption step in which the gaseous carbon dioxide supply source is brought into contact with an absorbent made of an aqueous solution of an alkanol (amine compound) to cause absorption and reaction, thereby obtaining a carbon dioxide-rich absorption liquid in which the carbon dioxide has reacted with the absorbent, and a regeneration step in which carbon dioxide is obtained by desorbing carbon dioxide from the carbon dioxide-rich absorption liquid obtained by the absorption step, and at the same time, the absorbent is regenerated.

[0004] A method for utilizing waste heat in such a carbon dioxide recovery process is disclosed in Patent Document 1. The method includes the steps of supplying a gaseous carbon dioxide source to a cooling tower to cool it, supplying the cooled gaseous carbon dioxide source to an absorption tower and bringing it into contact with a regenerated absorbing liquid supplied from a regeneration tower to absorb the carbon dioxide in the gaseous carbon dioxide source into the regenerated absorbing liquid, and heating the carbon dioxide absorbing solution stored in the bottom of the absorption tower by heat exchange with the regenerated absorbing liquid supplied from the regeneration tower, and then supplying the carbon dioxide absorbing solution to the regeneration tower, while heating the bottom of the regeneration tower with saturated steam to separate the carbon dioxide absorbing solution into carbon dioxide and the regenerated absorbing liquid, and then discharging and recovering the carbon dioxide from the regeneration tower. The method discloses a method for utilizing waste heat in a carbon dioxide recovery process, which is a continuous absorption method, characterized in that hot water is obtained by heating hot return water through one or a combination of two or more of the following: heat exchange with the regenerated absorbing liquid after heat exchange; heat exchange with carbon dioxide exhausted from the regeneration tower; and heat exchange with saturated water after heating the bottom of the regeneration tower.

[0005] Furthermore, Cited Document 2 discloses a CO2 absorption tower and a CO2 stripper tower. The CO2 absorption tower includes a gaseous carbon dioxide supply source inlet for introducing a gaseous carbon dioxide supply source into the CO2 absorption tower, a gaseous carbon dioxide supply source outlet for discharging the gaseous carbon dioxide supply source from the CO2 absorption tower, an absorbing liquid inlet for introducing an amine compound-containing absorbing liquid into the CO2 absorption tower, an absorbing liquid outlet for discharging the amine compound-containing absorbing liquid from the CO2 absorption tower, and packing that is a static mixer having spiral perforated blades.

[0006] The CO2 stripper includes an absorbent inlet for introducing an amine compound-containing absorbent into the CO2 stripper, an absorbent outlet for discharging the amine compound-containing absorbent from the CO2 stripper, a steam inlet for introducing steam into the CO2 stripper, a CO2 outlet for discharging CO2 from the CO2 stripper, and a packing that is a static mixer having spiral perforated blades. The method of Cited Document 2 simultaneously performs a carbon dioxide absorption method and an amine compound-containing absorbent regeneration method.

[0007] The carbon dioxide absorption method includes a first step in which a gaseous carbon dioxide source containing CO2 is brought into contact with an amine compound-containing absorbing liquid in a countercurrent or parallel flow manner using packings in a CO2 absorption tower, and the CO2 contained in the gaseous carbon dioxide source is reactively absorbed by the amine compound-containing absorbing liquid, the first step being a first step in which the gaseous carbon dioxide source flows from a gaseous carbon dioxide source inlet to a gaseous carbon dioxide source outlet, and the amine compound-containing absorbing liquid flows from an absorbing liquid inlet to an absorbing liquid outlet; and a second step in which the amine compound-containing absorbing liquid is removed from the CO2 absorption tower at a position downstream of the packing in the flow direction of the amine compound-containing absorbing liquid from the absorbing liquid inlet to the absorbing liquid outlet. a second step of recovering a portion of the amine compound-containing absorption liquid, cooling the recovered amine compound-containing absorption liquid, and supplying the cooled amine compound-containing absorption liquid to a CO2 absorption tower at a position upstream of the packing in the flow direction of the amine compound-containing absorption liquid; and a third step of supplying a liquid to the CO2 absorption tower at a position downstream of the packing in the flow direction of the gaseous carbon dioxide source from the gaseous carbon dioxide supply source inlet toward the gaseous carbon dioxide supply source outlet to bring the liquid into contact with the gaseous carbon dioxide source, recovering the liquid that has come into contact with the gaseous carbon dioxide source, and cooling the recovered liquid.

[0008] The method for regenerating an amine compound-containing absorbing liquid includes a first step in which an amine compound-containing absorbing liquid containing CO2 is brought into countercurrent contact with steam using packing in a CO2 stripper tower to strip CO2 from the amine compound-containing absorbing liquid, thereby regenerating the amine compound-containing absorbing liquid and recovering CO2, in which the amine compound-containing absorbing liquid flows from an absorbing liquid inlet to an absorbing liquid outlet and steam flows from a steam inlet to a CO2 outlet; and a second step in which a portion of the amine compound-containing absorbing liquid is recovered from the CO2 stripper tower at a position downstream of the packing in the flow direction of the amine compound-containing absorbing liquid from the absorbing liquid inlet to the absorbing liquid outlet, and the recovered amine compound-containing absorbing liquid is added. a second step of heating the amine compound-containing absorbing liquid and supplying the heated amine compound-containing absorbing liquid to a CO2 stripper tower at a position downstream of the packing in the flow direction of the amine compound-containing absorbing liquid; and a third step of recovering a portion of the amine compound-containing absorbing liquid from the CO2 stripper tower at a position downstream of the packing in the flow direction of the amine compound-containing absorbing liquid, heating the recovered amine compound-containing absorbing liquid to generate steam, and supplying the steam to the CO2 stripper tower from the steam inlet. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-225537 [Patent Document 2] International Publication No. 2018 / 190104 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0010] In the above Patent Documents 1 and 2, carbon dioxide is recovered from a gaseous carbon dioxide supply source by simultaneously carrying out a carbon dioxide absorption step and a carbon dioxide desorption step. However, depending on the operation of the factory, for example, in the case of a facility that operates only during the day and is shut down at night, the gaseous carbon dioxide supply source is not discharged at night, so the carbon dioxide recovery device must be shut down, resulting in low operation rates.

[0011] On the other hand, if the absorption tower and the regeneration tower are installed in physically separated locations, such as in different regions or countries, it becomes necessary to transport carbon dioxide between the absorption tower and the regeneration tower. However, transporting carbon dioxide using a mobile vehicle requires the use of fossil fuels, which results in the problem that the mobile vehicle becomes a source of carbon dioxide. Therefore, an object of the present invention is to provide a carbon dioxide recovery system and a mobile body that can also recover carbon dioxide generated from the mobile body. [Means for solving the problem]

[0012] The above problems are solved by the present invention described below.

[0013] That is, the carbon dioxide recovery system of the present invention (1) comprises an absorption tower site where carbon dioxide supplied from a gaseous carbon dioxide supply source is absorbed into a carbon dioxide lean absorption solution to obtain a carbon dioxide rich absorption solution; a regeneration tower site that desorbs carbon dioxide from the carbon dioxide-rich absorbent to recover a carbon dioxide-lean absorbent and carbon dioxide; a first moving body having a first storage section and transporting the carbon dioxide-rich absorbing liquid stored in the first storage section from the absorption tower site to the regeneration tower site; a second moving body having a second storage section and transporting the carbon dioxide lean absorption liquid stored in the second storage section from the regeneration tower site to the absorption tower site; a first absorption section provided in the first moving body and configured to absorb carbon dioxide generated from the first moving body into the carbon dioxide-rich absorption liquid stored in the first storage section; a second absorption section that is provided in the second moving body and absorbs carbon dioxide generated from the second moving body into the carbon dioxide lean absorption liquid stored in the second storage section; Equipped with.

[0014] Further, a carbon dioxide recovery system of the present invention (2) is the carbon dioxide recovery system according to (1), wherein the carbon dioxide lean absorption liquid and the carbon dioxide rich absorption liquid are absorption liquids containing an absorbent, The absorbent is an amine compound.

[0015] The present invention (3) also provides a moving body, comprising: an internal combustion engine; a storage section for storing a carbon dioxide rich absorption liquid or a carbon dioxide lean absorption liquid; an exhaust system extending from the internal combustion engine and through which exhaust gas containing carbon dioxide is passed; an absorption unit provided in the exhaust system, the absorption unit absorbing the carbon dioxide in the exhaust gas into a carbon dioxide-rich absorption liquid or a carbon dioxide-lean absorption liquid supplied from the storage unit; Equipped with.

[0016] Further, a moving body of the present invention (4) is the moving body according to (3), The absorption unit includes a pump unit that supplies the carbon dioxide-rich absorption liquid or the carbon dioxide-lean absorption liquid to the absorption unit, and is supplied with driving force from the internal combustion engine.

[0017] The present invention (5) is a moving body according to (3) or (4), The carbon dioxide lean absorption liquid and the carbon dioxide rich absorption liquid are absorption liquids containing an absorbent, The absorbent is an amine compound. [Effects of the Invention]

[0018] According to the present invention, it is possible to provide a carbon dioxide recovery system and a mobile body that can also recover carbon dioxide generated from the mobile body. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a system diagram showing a carbon dioxide recovery system according to an embodiment. [Figure 2] FIG. 2 is a schematic diagram showing a moving body of the first embodiment of the carbon dioxide recovery system shown in FIG. [Figure 3] FIG. 10 is a schematic diagram showing a moving body of a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0020] The carbon dioxide recovery system of the present invention will be described with reference to FIG.

[0021] 1, the carbon dioxide recovery system 10 includes an absorption tower site 31, a regeneration tower site 32, a first moving body 33 that transports the carbon dioxide-rich absorption solution 3 from the absorption tower site 31 to the regeneration tower site 32, and a second moving body 34 that transports the carbon dioxide-lean absorption solution 4 from the regeneration tower site 32 to the absorption tower site 31. At the absorption tower site 31, an absorption step is carried out to absorb carbon dioxide in the gaseous carbon dioxide supply source 1. At the regeneration tower site 32, a regeneration step is carried out to desorb and recover carbon dioxide from the carbon dioxide-rich absorption solution.

[0022] The absorption tower site 31 includes an absorption tower 11 having a contact mechanism 19a therein, a carbon dioxide-rich absorption liquid storage tank 13a for the absorption tower, a carbon dioxide-lean absorption liquid storage tank 14a for the absorption tower, a gaseous carbon dioxide supply source supply pipe 27 connected to the lower part of the absorption tower 11, a tower top gas discharge pipe 28 connected to the top of the absorption tower 11 and discharging the treated exhaust gas 2 from the absorption tower 11, a carbon dioxide-lean absorption liquid supply pipe 21 having one end connected to the carbon dioxide-lean absorption liquid storage tank 14a for the absorption tower and the other end connected to the upper part of the absorption tower 11, and a carbon dioxide-rich absorption liquid discharge pipe 22 connected to the bottom of the absorption tower 11 and the other end connected to the carbon dioxide-rich absorption liquid storage tank 13a for the absorption tower.

[0023] In the absorption tower 11, a carbon dioxide absorption step is carried out. The carbon dioxide-rich absorption liquid storage tank 13a for the absorption tower can store the carbon dioxide-rich absorption liquid 3 obtained by carrying out the absorption step. The carbon dioxide-lean absorption liquid storage tank 14a for the absorption tower can store the carbon dioxide-lean absorption liquid 4 to be supplied to the absorption tower 11 prior to the absorption step. The gaseous carbon dioxide supply source supply pipe 27 supplies the gaseous carbon dioxide source 1 to the absorption tower 11.

[0024] The gaseous carbon dioxide supply source 1 is a gas containing carbon dioxide. Examples of sources of the gaseous carbon dioxide supply source 1 include devices such as blast furnaces, lime kilns, heating furnaces, reactors, and boilers found in power plants, steel mills, cement plants, refineries, chemical plants, etc. Another example of a source of the gaseous carbon dioxide supply source 1 is the atmosphere.

[0025] The regeneration tower site 32 includes a regeneration tower 12 having a contact mechanism 19b installed therein, a carbon dioxide lean absorbent storage tank 14b for the regeneration tower, a carbon dioxide rich absorbent storage tank 13b for the regeneration tower, a carbon dioxide rich absorbent supply pipe 23 having one end connected to the carbon dioxide rich absorbent storage tank 13b for the regeneration tower and the other end connected to the top of the regeneration tower 12, a carbon dioxide lean absorbent discharge pipe 24 having one end connected to the bottom of the regeneration tower 12 and the other end connected to the carbon dioxide lean absorbent storage tank 14b for the regeneration tower, a heat exchanger 15 provided at the intersection of the carbon dioxide rich absorbent supply pipe 23 and the carbon dioxide lean absorbent discharge pipe 24, and a carbon dioxide The carbon dioxide lean absorption liquid discharge pipe 26 includes a cooler 20 attached to the carbon dioxide lean absorption liquid discharge pipe 24, a tower bottom heating branch pipe 25 branching from the vicinity of the tower bottom of the carbon dioxide lean absorption liquid discharge pipe 24 and connecting to the lower part of the tower, a reboiler 16 attached to the tower bottom heating branch pipe 25, a carbon dioxide discharge pipe 29 connecting to the tower top of the regeneration tower 12 for discharging carbon dioxide 5 from the regeneration tower 12, a carbon dioxide cooler 17 provided midway along the carbon dioxide discharge pipe 29, a gas-liquid separator 18 provided on the carbon dioxide discharge pipe 29 downstream of the carbon dioxide cooler 17, and a coolant return pipe 26 having one end connected to the liquid recovery section of the gas-liquid separator 18 and the other end connected to the upper part of the tower.

[0026] In the regeneration tower 12, a regeneration step is carried out in which carbon dioxide is released from the carbon dioxide-rich absorbing solution to regenerate a carbon dioxide-lean absorbing solution. The carbon dioxide-lean absorbing solution storage tank 14b for the regeneration tower can store the carbon dioxide-lean absorbing solution 4 obtained by carrying out the regeneration step. The carbon dioxide-rich absorbing solution storage tank 13b for the regeneration tower can store the carbon dioxide-rich absorbing solution 3 to be supplied to the regeneration tower 12 prior to the regeneration step. The heat exchanger 15 exchanges heat between the liquid in the carbon dioxide-rich absorbing solution supply pipe 23 and the liquid in the carbon dioxide-lean absorbing solution discharge pipe 24.

[0027] Although not shown, the carbon dioxide lean absorption liquid supply pipe 21, the carbon dioxide rich absorption liquid discharge pipe 22, the carbon dioxide rich absorption liquid supply pipe 23, the carbon dioxide lean absorption liquid discharge pipe 24, the tower bottom heating branch pipe 25, and the coolant return pipe 26 are provided with liquid delivery pumps for delivering liquid.

[0028] The first moving body 33 transports the carbon dioxide-rich absorbing solution 3 in the carbon dioxide-rich absorbing solution storage tank 13a for the absorber at the absorption tower site 31 to the carbon dioxide-rich absorbing solution storage tank 13b for the regeneration tower at the regeneration tower site 32. The second moving body 34 transports the carbon dioxide-lean absorbing solution 4 in the carbon dioxide-lean absorbing solution storage tank 14b for the regeneration tower at the regeneration tower site 32 to the carbon dioxide-lean absorbing solution storage tank 14a for the absorber at the absorption tower site 31. The first moving body 33 and the second moving body 34 will be described in detail later.

[0029] A carbon dioxide recovery method performed by a carbon dioxide recovery system 10 will be described with reference to FIG.

[0030] The absorption process performed at the absorption tower site 31 will now be described. A gaseous carbon dioxide supply source 1 is supplied to the lower part of the absorption tower 11 via a gaseous carbon dioxide supply source supply pipe 27 connected to the supply source. The carbon dioxide lean absorbing liquid 4 in the carbon dioxide lean absorbing liquid storage tank 14a for the absorber is supplied to the upper part of the absorption tower 11 via a carbon dioxide lean absorbing liquid supply pipe 21. The gaseous carbon dioxide supply source 1 flows upward into the absorption tower 11, and the carbon dioxide lean absorbing liquid 4 flows downward. This causes the gaseous carbon dioxide supply source 1 and the carbon dioxide lean absorbing liquid 4 to come into countercurrent contact within the absorption tower 11. At this time, the carbon dioxide in the gaseous carbon dioxide supply source 1 reacts with the absorbent in the carbon dioxide lean absorbing liquid 4, and the carbon dioxide is reactively absorbed into the carbon dioxide lean absorbing liquid 4. This produces a carbon dioxide-rich absorbing liquid 3, which accumulates at the bottom of the absorption tower 11. The carbon dioxide-rich absorbing liquid 3 accumulated at the bottom of the absorption tower 11 is sent to the carbon dioxide-rich absorbing liquid storage tank 13a for the absorption tower via the carbon dioxide-rich absorbing liquid discharge pipe 22 and is held in the carbon dioxide-rich absorbing liquid storage tank 13a for the absorption tower.

[0031] The regeneration process performed at the regeneration tower site 32 will be described. In the regeneration tower 12, a portion of the carbon dioxide lean absorption solution 4 accumulated at the bottom of the regeneration tower 12 is extracted. The carbon dioxide lean absorption solution 4 is heated by the reboiler 16, which is warmed by high-temperature steam (water vapor) 45, and the heated carbon dioxide lean absorption solution 4 is returned to the bottom of the regeneration tower 12. This heats the carbon dioxide lean absorption solution 4 accumulated at the bottom of the tower, and the absorption solution at the bottom becomes absorption solution at the saturation temperature. This generates an upward flow of vapor of the absorption solution at the saturation temperature in the regeneration tower 12, heating the inside of the regeneration tower 11. In this way, a portion of the carbon dioxide lean absorption solution 4 accumulated at the bottom of the regeneration tower 12 is extracted, the carbon dioxide lean absorption solution 4 is heated by the reboiler 16, and the heated carbon dioxide lean absorption solution 4 is returned to the bottom of the regeneration tower 12, and this process is repeated. This generates an upward flow of vapor of the absorption solution at the saturation temperature in the regeneration tower 12.

[0032] Meanwhile, the carbon dioxide-rich absorbing solution 3 in the carbon dioxide-rich absorbing solution storage tank 13a for the regeneration tower is supplied to the upper part of the regeneration tower 12 via the carbon dioxide-rich absorbing solution supply pipe 23, thereby forming a downward flow of the carbon dioxide-rich absorbing solution 3. When the upward flow and the downward flow meet in the regeneration tower 12, the carbon dioxide-rich absorbing solution 3 is heated. At this time, carbon dioxide is desorbed from the carbon dioxide-rich absorbing solution 3 and a carbon dioxide-lean absorbing solution 4 is produced. The produced carbon dioxide-lean absorbing solution 4 accumulates at the bottom of the regeneration tower 11. A portion of the carbon dioxide-lean absorbing solution 4 that has accumulated at the bottom of the regeneration tower 11 is sent to the carbon dioxide-lean absorbing solution storage tank 14b for the regeneration tower via the carbon dioxide-lean absorbing solution discharge pipe 24 and is retained therein.

[0033] The desorbed carbon dioxide 5 is recovered through a carbon dioxide discharge pipe 29. The carbon dioxide 5 discharged from the regeneration tower 12 contains water vapor and a small amount of absorbent. For this reason, the carbon dioxide 5 discharged from the regeneration tower 12 is cooled in a carbon dioxide cooler 17, and the water (water vapor) and absorbent are separated from the carbon dioxide 5 by a gas-liquid separator 18, and only the carbon dioxide 5 is recovered. The water and absorbent separated in the gas-liquid separator 18 are returned to the top of the tower through a coolant return pipe 26.

[0034] When the absorption process is performed at the absorption tower site 31, the carbon dioxide-lean absorbing liquid 4 in the carbon dioxide-lean absorbing liquid storage tank 14a for the absorber decreases. Therefore, the second mover 34 transfers the carbon dioxide-lean absorbing liquid 4 in the regeneration tower site 32 (carbon dioxide-lean absorbing liquid storage tank 14b for the regeneration tower) to the carbon dioxide-lean absorbing liquid storage tank 14a for the absorber. When the regeneration process is performed at the regeneration tower site 32, the carbon dioxide-rich absorbing liquid 3 in the carbon dioxide-rich absorbing liquid storage tank 13b for the regeneration tower decreases. Therefore, the first mover 33 transfers the carbon dioxide-rich absorbing liquid 3 in the absorption tower site 31 (carbon dioxide-rich absorbing liquid storage tank 13a for the absorber) to the carbon dioxide-rich absorbing liquid storage tank 13b for the regeneration tower.

[0035] In the present invention, the absorption step at the absorption tower site 31 and the regeneration step at the regeneration tower site 32 can be carried out independently. In other words, the absorption step and the regeneration step may be carried out in parallel, or there may be a time period during which only the absorption step or only the regeneration step is carried out.

[0036] In this way, the carbon dioxide recovery system 10 performs an absorption process, a regeneration process, a carbon dioxide lean absorption liquid transfer process, and a carbon dioxide rich absorption liquid transfer process, thereby recovering carbon dioxide from the treated gas of the present invention.

[0037] In the method for recovering carbon dioxide from a gaseous carbon dioxide supply source of the present invention, both the carbon dioxide-lean absorption liquid and the carbon dioxide-rich absorption liquid are absorption liquids containing an absorbent. The carbon dioxide-lean absorption liquid is an absorption liquid from which carbon dioxide has been desorbed in the regeneration step and which has absorbed a small amount of carbon dioxide. On the other hand, the carbon dioxide-rich absorption liquid is an absorption liquid from which carbon dioxide has been absorbed in the absorption step and which has absorbed a large amount of carbon dioxide.

[0038] Examples of absorbents contained in the absorbing solution include all amine compounds, such as alkanolamines such as monoethanolamine, diethanolamine, diisopropanolamine, dimethyldiethanolamine, and triethanolamine, amino alcohols such as aminodiethylene glycol, hindered amine compounds, piperazine compounds, piperidine compounds, polyalkylpolyamine compounds, amino acid compounds, amino acid salt compounds, and derivatives thereof, as well as organic amine compounds. The absorbent may be one type or a combination of two or more of the above types in any mixing ratio. Preferred absorbents have a high absorption rate, a large carbon dioxide absorption capacity, are thermally stable, and require little energy for regeneration.

[0039] The absorbing liquid is, for example, an aqueous solution of an absorbent. The absorbing liquid is preferably an aqueous solution of alkanolamine, and particularly preferably an aqueous solution of alkanolamine with a concentration of 15 to 45 mass %. [First embodiment of the moving body]

[0040] Next, a mobile body 51 according to the first embodiment will be described with reference to Figures 1 and 2. The first mobile body 33 and the second mobile body 34 are, for example, transport vehicles of the same type, such as tank trucks. Therefore, the mobile body 51 described in this embodiment can sometimes be used as the first mobile body 33 when transporting the carbon dioxide-rich absorbent solution 3 from the absorption tower site 31 to the regeneration tower site 32, and can sometimes be used as the second mobile body 34 when transporting the carbon dioxide-lean absorbent solution 4 from the regeneration tower site 32 to the absorption tower site 31.

[0041] The mobile body 51 includes a vehicle body 52, an internal combustion engine 53 mounted on the vehicle body 52, an exhaust system 65 extending from the internal combustion engine 53 and through which exhaust gas containing carbon dioxide is passed, a storage unit 55 placed on a loading platform 54 of the vehicle body 52 and storing an absorption liquid therein, and an absorption unit 56 provided midway through the exhaust system 65 and causing the absorption liquid (carbon dioxide-rich absorption liquid 3 or carbon dioxide-lean absorption liquid 4) in the storage unit 55 to absorb carbon dioxide in the exhaust gas. The storage unit 55 is configured as a general tank for a tank truck and has multiple compartments 55A, 55B therein. When the mobile body 51 is used as the first mobile body 33, the storage unit 55 (compartment 55A) is used, for example, as a first storage unit that stores the carbon dioxide-rich absorption liquid 3. When the moving body 51 is used as the second moving body 34, the storage section 55 (the compartment 55B) is used as a second storage section that stores the carbon dioxide lean absorbing solution 4, for example.

[0042] The internal combustion engine 53 is configured as, for example, a diesel engine or the like, but may be configured as another engine such as a gasoline engine.

[0043] The absorption unit 56 is formed in the shape of a so-called ejector-type jet scrubber. When the moving body 51 is used as the first moving body 33, the absorption unit 56 is used as a first absorption unit that absorbs carbon dioxide generated from the first moving body 33 into the carbon dioxide-rich absorption solution 3 stored in the first storage unit. When the moving body 51 is used as the second moving body 34, the absorption unit 56 is used as a second absorption unit that absorbs carbon dioxide generated from the second moving body 34 into the carbon dioxide-lean absorption solution 4 stored in the second storage unit.

[0044] The absorption section 56 includes a first pipe section 61 connected to the bottom of each of the compartments 55A, 55B of the storage section 55 and merging into a single pipe downstream, interlocking valves 100B to 105B provided midway through each of the multiple branch pipes of the first pipe section 61, a pump section 62 connected to the downstream end of the first pipe section 61, a second pipe section 63 extending from the pump section 62 to the upper side of the storage section 55, a jet nozzle 64 provided at the end of the second pipe section 63 opposite to the end connected to the pump section 62, an exhaust duct 66 covering the jet nozzle 64 and the outlet of the exhaust system 65, and an exhaust duct 66 located downstream of the jet nozzle 64. The storage unit 55 includes an integrally provided cylindrical scrubber section 67, a separator chamber 68 provided downstream of the scrubber section 67, a baffle plate 71 provided in the separator chamber 68 and having a generally L-shaped cross section, a third pipe section 72 branching from the separator chamber 68 to extend to each of the individual chambers 55A and 55B of the storage unit 55, interlocking valves 100A-105A provided midway along each of the branch pipes of the third pipe section 72, an exhaust chamber 74 provided adjacent to the separator chamber 68 and connected by a conduit 73, a filter 75 (e.g., a mesh screen) provided in the exhaust chamber 74, and an exhaust pipe 76 provided downstream of the filter 75. The interlocking valves 100A-105A and the interlocking valves 100B-105B are, for example, electromagnetic valves, but may also be valves that are manually switched on and off.

[0045] The pump unit 62 is configured as a centrifugal pump, but may also be configured as an axial pump or other pump. The driving force of the pump unit 62 may be obtained from the internal combustion engine 53 via a drive shaft 77, a clutch 78, etc., as shown in Figure 2, or may be driven by a motor that receives power from a battery mounted on the vehicle body 52.

[0046] Next, the operation of the mobile body 51 of this embodiment will be described. When the mobile body 51 is used as the first mobile body 33 for transporting the carbon dioxide-rich absorbing solution 3 from the absorption tower site 31 to the regeneration tower site 32, the carbon dioxide-rich absorbing solution 3 is stored in the storage section 55 of the mobile body 51. When the mobile body 51 is used as the second mobile body 34 for transporting the carbon dioxide-lean absorbing solution 4 from the regeneration tower site 32 to the absorption tower site 31, the carbon dioxide-lean absorbing solution 4 is stored in the storage section 55 of the mobile body 51. Below, the operation when the mobile body 51 is used as the first mobile body 33 will mainly be described.

[0047] When the mobile body 51 travels, the internal combustion engine 53 is driven to generate propulsive force, and exhaust gas containing carbon dioxide is generated as a result of the combustion and explosion of fuel (such as diesel). The exhaust gas flows through the exhaust system 65 and is guided into an exhaust duct 66 near a jet nozzle 64, as indicated by the dashed arrow. Meanwhile, the pump unit 62, which receives rotational power from the internal combustion engine 53, is driven to rotate and pumps the carbon dioxide-rich absorbing solution 3 from the compartments 55A and 55B of the storage unit 55 through a first pipe unit 61 and a second pipe unit 63 to the upper part of the storage unit 55, as indicated by the arrow. The jet nozzle 64 ejects the carbon dioxide-rich absorbing solution 3, which has been pressurized by the action of the pump unit 62, as a jet stream downstream. The exhaust gas is taken in by this jet stream, and the carbon dioxide in the exhaust gas is taken in by the carbon dioxide-rich absorbing solution 3. Note that the carbon dioxide-rich absorbing solution 3 has taken in a larger amount of carbon dioxide than the carbon dioxide-lean absorbing solution 4, but has not taken in the maximum amount of carbon dioxide that it can absorb. Therefore, it is possible to take in carbon dioxide into the carbon dioxide-rich absorbing solution 3 up to a limit amount corresponding to the concentration of carbon dioxide in the exhaust gas generated from the internal combustion engine 53.

[0048] The jet of carbon dioxide-rich absorbing liquid 3 collides with the baffle plate 71 in the separator chamber 68. This separates the carbon dioxide-rich absorbing liquid 3 from the exhaust gas. The carbon dioxide-rich absorbing liquid 3 that collides with the baffle plate 71 accumulates in the lower part of the separator chamber 68. The carbon dioxide-rich absorbing liquid 3 that accumulates in the lower part of the separator chamber 68 is returned to each of the individual chambers 55A and 55B of the storage section 55 via the third pipe section 72 by the action of gravity. Note that the interlocking valves 100A to 105A and the interlocking valves 100B to 105B are preferably opened and closed by a control section (computer) (not shown) powered by an on-board battery so that the carbon dioxide-rich absorbing liquid 3 that has come out of each of the individual chambers 55A and 55B is returned to the original individual chambers 55A and 55B. Alternatively, the interlocking valves may be opened and closed manually. In other words, when interlocking valve 100A is open and interlocking valves 101A to 105A are closed, interlocking valve 100B is open and interlocking valves 101B to 105B are closed. Similarly, when interlocking valve 101A is open and interlocking valves 100A, 102A to 105A are closed, interlocking valve 101B is open and interlocking valves 100B, 102B to 105B are closed. When interlocking valve 102A is open and interlocking valves 100A, 101A, and 103A to 105A are closed, interlocking valve 102B is open and interlocking valves 100B, 101B, and 103B to 105B are closed. When interlocking valve 103A is open and interlocking valves 100A to 102A, 104A, and 105A are closed, interlocking valve 103B is open and interlocking valves 100B to 102B, 104B, and 105B are closed. When interlocking valve 104A is open and interlocking valves 100A to 103A, and 105A are closed, interlocking valve 104B is open and interlocking valves 100B to 103B, and 105B are closed. When interlocking valve 105A is open and interlocking valves 100A to 104A are closed, interlocking valve 105B is open and interlocking valves 100B to 104B are closed. The carbon dioxide-rich absorbing liquid 3 that has absorbed carbon dioxide in the exhaust gas and returned to each of the individual chambers 55A and 55B diffuses in each of the individual chambers 55A and 55B so as to be uniform with respect to the carbon dioxide-rich absorbing liquid 3 that originally remained in each of the individual chambers 55A and 55B.

[0049] The exhaust gas that flows into the separator chamber 68 together with the jet of carbon dioxide-rich absorption liquid 3 has carbon dioxide removed and is sent to the adjacent exhaust chamber 74 via a conduit 73. The exhaust gas sent to the exhaust chamber 74 is further purified by a filter 75 (mesh screen or the like) and is released into the atmosphere via an exhaust pipe 76. In this way, in the mobile body 51 of this embodiment, carbon dioxide is removed from the exhaust gas, so that the release of carbon dioxide into the atmosphere during movement can be significantly reduced.

[0050] In addition, a pre-treatment device (such as a desulfurization device or a three-way catalytic converter) may be installed midway through the exhaust system 65 to remove harmful substances such as hydrocarbons (HC), carbon monoxide (CO), sulfur oxides (SOx), nitrogen oxides (NOx), and particulate matter (PM) from the exhaust gas before the exhaust gas is supplied to the exhaust duct 66.

[0051] The operation when the movable body 51 is used as the second movable body 34 is generally similar to that described above. When used as the second movable body 34, the carbon dioxide lean absorbing solution 4 is stored in the storage section 55 instead of the carbon dioxide rich absorbing solution 3. The carbon dioxide lean absorbing solution 4, pumped up to the top of the storage section 55 by the action of the pump section 62, is ejected as a jet from the jet nozzle 64 toward the downstream baffle plate 71. Carbon dioxide in the exhaust gas is absorbed by this carbon dioxide lean absorbing solution 4. Since the carbon dioxide lean absorbing solution 4 is an absorbing solution with a large carbon dioxide absorption capacity, it can absorb carbon dioxide in the exhaust gas to the limit. The carbon dioxide lean absorbing solution 4 that has absorbed the carbon dioxide is returned by gravity to each of the individual chambers 55A, 55B of the storage section 55 via the third pipe section 72. The exhaust gas from which the carbon dioxide has been removed is purified by a filter 75 in the exhaust chamber 74 and released into the atmosphere.

[0052] According to the first embodiment, the following can be said. The carbon dioxide recovery system 10 comprises an absorption tower site 31 where carbon dioxide supplied from a gaseous carbon dioxide supply source is absorbed into a carbon dioxide-lean absorbing solution 4 to obtain a carbon dioxide-rich absorbing solution 3; a regeneration tower site 32 where carbon dioxide is desorbed from the carbon dioxide-rich absorbing solution 3 to recover the carbon dioxide-lean absorbing solution 4 and carbon dioxide; a first moving body 33 having a first storage section and transporting the carbon dioxide-rich absorbing solution 3 stored in the first storage section from the absorption tower site 31 to the regeneration tower site 32; a second moving body 34 having a second storage section and transporting the carbon dioxide-lean absorbing solution 4 stored in the second storage section from the regeneration tower site 32 to the absorption tower site 31; a first absorption unit provided in the first moving body 33 and absorbing carbon dioxide generated from the first moving body 33 into the carbon dioxide-rich absorbing solution 3 stored in the first storage section 55; and a second absorption unit provided in the second moving body 34 and absorbing carbon dioxide generated from the second moving body 34 into the carbon dioxide-lean absorbing solution 4 stored in the second storage section.

[0053] According to this configuration, the first absorption unit and the second absorption unit can also capture carbon dioxide generated from the mobile body 51. This makes it possible to minimize the problem of the mobile body 51, which is a component of the carbon dioxide capture system 11, becoming a carbon dioxide generation source.

[0054] The mobile body 51 comprises an internal combustion engine 53, a storage section 55 for storing a carbon dioxide-rich absorption liquid 3 or a carbon dioxide-lean absorption liquid 4, an exhaust system 65 extending from the internal combustion engine 53 and through which exhaust gas containing carbon dioxide is passed, and an absorption section 56 provided midway through the exhaust system 65, which absorbs the carbon dioxide in the exhaust gas into the carbon dioxide-rich absorption liquid 3 or the carbon dioxide-lean absorption liquid 4 supplied from the storage section 55.

[0055] According to this configuration, the carbon dioxide in the exhaust gas generated from the mobile body 51 can be absorbed by the carbon dioxide-rich absorbing liquid 3 or the carbon dioxide-lean absorbing liquid 4 in the storage section 55. This makes it possible to minimize problems such as discharging the carbon dioxide generated from the mobile body 51 into the environment when the carbon dioxide-rich absorbing liquid 3 or the carbon dioxide-lean absorbing liquid 4 is transported using the mobile body 51.

[0056] The absorption unit 56 includes a pump unit 62 that sends the carbon dioxide-rich absorbing solution 3 or the carbon dioxide-lean absorbing solution 4 to the absorption unit 56, and that is supplied with driving force from the internal combustion engine 53. According to this configuration, the pump unit 62 can be driven by the driving force from the internal combustion engine 53, and no motor-driven pump is required to send the carbon dioxide-rich absorbing solution 3 or the carbon dioxide-lean absorbing solution 4 toward the absorption unit 56. This allows the weight of the mobile body 51 to be reduced, and the total amount of carbon dioxide generated during transportation by the mobile body 51 can be reduced.

[0057] In the following embodiment, differences from the first embodiment will be mainly described, and illustrations and descriptions of parts common to the first embodiment will be omitted. [Second embodiment]

[0058] A moving body 51 of the second embodiment will be described with reference to Fig. 3. The absorbing section 56 is formed in a so-called spray shape that sprays an absorbing liquid onto the contact mechanism 85 to absorb carbon dioxide from the exhaust gas.

[0059] The storage unit 55 is configured as a general tank for a tank truck and has multiple compartments inside. In this embodiment, the storage unit 55 has, for example, a first compartment 55A at the front and a second compartment 55B at the rear. Although two compartments are shown in FIG. 3, the number of compartments is not limited to this, and the storage unit 55 may have three or more compartments.

[0060] The absorption section 56 includes a first pipe section 61 connected to the bottom of the first compartment 55A and the second compartment 55B of the storage section 55 and joining together to form a single pipe downstream, a first three-way valve 82 provided midway along the first pipe section 61, a pump section 62 connected to the downstream end of the first pipe section 61, a second pipe section 63 extending from the pump section 62 to the upper side of the storage section 55, a second three-way valve 83 provided midway along the second pipe section 63, an exhaust duct 66 extending horizontally in a duct-like manner at the top of the storage section 55, and a plurality of spray nozzles 84 located at the end of the second pipe section 63 opposite the end connected to the pump section 62 and provided within the exhaust duct 66. The exhaust duct 66 includes a plurality of porous, filter-like contact mechanisms 85 disposed within the exhaust duct 66 at positions facing the plurality of spray nozzles 84; an exhaust system 65 extending from the internal combustion engine 53 to the upstream end of the exhaust duct 66; a third pipe section 72 extending from an intermediate portion of the exhaust duct 66 to a first compartment 55A of the storage section 55; a fourth pipe section 86 extending from the downstream end of the exhaust duct 66 to a second compartment 55B of the storage section 55; an exhaust pipe 76 disposed at the downstream end of the exhaust duct 66; a filter 75 (e.g., a mesh screen) disposed midway along the exhaust pipe 76; and a plurality of partition plates 87 dividing the exhaust duct 66 into a plurality of chambers. The plurality of spray nozzles 84 are disposed in series within the exhaust duct 66 at predetermined intervals. Similarly, the plurality of contact mechanisms 85 are disposed in series within the exhaust duct 66 at predetermined intervals. The plurality of partition plates 87 have ventilation holes 87A for passing exhaust gas downstream.

[0061] The first pipe section 61 merges into one pipe line via a first three-way valve 82. The second pipe section 63 branches downstream into two pipe lines, a first auxiliary pipe line 63A and a second auxiliary pipe line 63B, via a second three-way valve 83. The first auxiliary pipe line 63A further branches downstream into multiple pipe lines connected to each of the multiple spray nozzles 84. The second auxiliary pipe line 63B further branches downstream into multiple pipe lines connected to each of the multiple spray nozzles 84.

[0062] The first three-way valve 82 can switch between a state in which the pump unit 62 is connected to the first compartment 55A and a state in which the pump unit 62 is connected to the second compartment 55B. In this embodiment, the first three-way valve 82 is manually switched, but the first three-way valve 82 may be configured as a solenoid valve, and the connection state may be automatically switched under the control of a separately provided control unit (computer).

[0063] The second three-way valve 83 can switch between a state in which the pump unit 62 is connected to the first auxiliary line 63A and a state in which the pump unit 62 is connected to the second auxiliary line 63B. In this embodiment, the second three-way valve 83 is manually switched, but the second three-way valve 83 may be configured as an electromagnetic valve, and the connection state may be automatically switched under the control of a separately provided control unit (computer).

[0064] The spray nozzle 84 is configured with consideration given to the optimal particle size, particle size distribution, and spray pattern of the droplets to be ejected. The contact mechanism 85 is formed, for example, by stacking multiple layers of sheet-like steel wool in the thickness direction. The spray nozzle 84 sprays atomized absorbent liquid onto the contact mechanism 85, allowing the contact mechanism 85 to be uniformly wetted with the absorbent liquid.

[0065] The structure of the contact mechanism 85 is not limited to the above. Examples of the contact mechanism 85 include packing, trays, sprays, fluidized packing, liquid film cross-flow contactor, high-speed swirl-flow packing, mechanical force packing, and the like, or a combination thereof, and are not particularly limited as long as they have an effective contact area and mass transfer rate.

[0066] Next, the operation of the movable body 51 of this embodiment will be described. When the movable body 51 is used as the first movable body 51 for transporting the carbon dioxide-rich absorbing solution 3 from the absorption tower site 31 to the regeneration tower site 32, the carbon dioxide-rich absorbing solution 3 is stored in the storage section 55 (first compartment 55A and second compartment 55B) of the movable body 51. When the movable body 51 is used as the second movable body 51 for transporting the carbon dioxide-lean absorbing solution 4 from the regeneration tower site 32 to the absorption tower site 31, the carbon dioxide-lean absorbing solution 4 is stored in the storage section 55 of the movable body 51. Below, the operation when the movable body 51 is used as the first movable body 51 will be mainly described. In the initial state, the first three-way valve 82 is in a state (first state) in which the pump section 62 and the first compartment 55A are connected. In the initial state, the second three-way valve 83 is in a state (third state) in which the pump section 62 and the first auxiliary pipe 63A are connected.

[0067] When the mobile body 51 travels, a propulsive force is generated by the drive of the internal combustion engine 53, and exhaust gas containing carbon dioxide is generated as a result of the combustion and explosion of fuel (diesel, etc.). The exhaust gas flows inside the exhaust system 65 and is guided upstream of the exhaust duct 66. Meanwhile, the pump section 62, which receives a supply of rotational power from the internal combustion engine 53, is driven to rotate and pumps the carbon dioxide-rich absorption liquid 3 from the first compartment 55A of the storage section 55 to the upper part of the storage section 55 via the first pipe section 61 and the second pipe section 63.

[0068] The spray nozzle 84 sprays the carbon dioxide-rich absorbing liquid 3, which has been pressurized by the action of the pump unit 62, in the form of a mist toward the contact mechanism 85. The contact mechanism 85 is uniformly wetted by this mist of carbon dioxide-rich absorbing liquid 3. The exhaust gas flows through the exhaust duct 66 and passes through this contact mechanism 85 from the upstream side to the downstream side. At this time, the exhaust gas comes into contact with the carbon dioxide-rich absorbing liquid 3 in the contact mechanism 85, and carbon dioxide in the exhaust gas is taken into the carbon dioxide-rich absorbing liquid 3. Note that the carbon dioxide-rich absorbing liquid 3 has taken in a larger amount of carbon dioxide than the carbon dioxide-lean absorbing liquid 4, but has not taken in carbon dioxide to the limit of its absorbability. For this reason, carbon dioxide can be taken into the carbon dioxide-rich absorbing liquid 3 without any problems as long as the concentration level of carbon dioxide in the exhaust gas generated from the internal combustion engine 53 is at the same level.

[0069] The carbon dioxide-rich absorbing solution 3 that has absorbed carbon dioxide in the contact mechanism 85 accumulates in the lower part of the exhaust duct 66 and is returned by gravity to the first compartment 55A via the third pipe part 72. The carbon dioxide-rich absorbing solution 3 that has absorbed carbon dioxide in the exhaust gas and returned to the first compartment 55A diffuses within the first compartment 55A so as to become uniform with respect to the carbon dioxide-rich absorbing solution 3 that originally remained in each compartment 55A.

[0070] The exhaust gas that has passed through the multiple contact mechanisms 85 has carbon dioxide removed and is sent downstream of the exhaust duct 66. The exhaust gas sent downstream of the exhaust duct 66 is further purified by a filter 75 (mesh screen or the like) and is released into the atmosphere via the exhaust pipe 76. In this way, in the mobile body 51 of this embodiment, carbon dioxide is removed from the exhaust gas, so that the release of carbon dioxide into the atmosphere during movement can be significantly reduced.

[0071] In addition, a pre-treatment device (such as a desulfurization device or a three-way catalytic converter) may be installed midway through the exhaust system 65 to remove harmful substances such as hydrocarbons (HC), carbon monoxide (CO), sulfur oxides (SOx), nitrogen oxides (NOx), and particulate matter (PM) from the exhaust gas before the exhaust gas is supplied to the exhaust duct 66.

[0072] The driver of mobile object 51 may switch the connection states of first three-way valve 82 and second three-way valve 83 at a predetermined timing, for example, every time mobile object 51 travels 100 to 200 km. That is, the driver can manually switch first three-way valve 82 from a state (first state) in which pump unit 62 and first compartment 55A are connected to each other to a state (second state) in which pump unit 62 and second compartment 55B are connected to each other. Furthermore, simultaneously with the above-described switching of first three-way valve 82, the driver can manually switch second three-way valve 83 from a state (third state) in which pump unit 62 and first auxiliary line 63A are connected to each other to a state (fourth state) in which pump unit 62 and second auxiliary line 63B are connected to each other.

[0073] As a result, the pump unit 62 is rotationally driven to pump the carbon dioxide-rich absorbing liquid 3 from the second compartment 55B of the storage unit 55 through the first pipe unit 61 and the second pipe unit 63 to the upper part of the storage unit 55. The spray nozzle 84 injects the carbon dioxide-rich absorbing liquid 3, which has been pressurized by the action of the pump unit 62, in the form of a mist toward the contact mechanism 85. The contact mechanism 85 is uniformly wetted by this mist of carbon dioxide-rich absorbing liquid 3. The exhaust gas flows through the exhaust duct 66 and passes through this contact mechanism 85 from the upstream side to the downstream side. At that time, the exhaust gas comes into contact with the carbon dioxide-rich absorbing liquid in the contact mechanism 85, and carbon dioxide in the exhaust gas is taken up into the carbon dioxide-rich absorbing liquid 3.

[0074] The carbon dioxide-rich absorbing solution 3 that has absorbed carbon dioxide in the contact mechanism 85 accumulates at the bottom of the exhaust duct and is returned to the second compartment 55B via the fourth pipe section 86 by the action of gravity. The carbon dioxide-rich absorbing solution 3 that has absorbed carbon dioxide in the exhaust gas and returned to the second compartment 55B diffuses uniformly among the carbon dioxide-rich absorbing solution 3 that originally remained in the second compartment 55B. In this way, by switching the connection states of the first three-way valve 82 and the second three-way valve 83 at a predetermined timing, it is possible to prevent variations in the amount of carbon dioxide held between the compartments. This makes it possible to prevent a situation in which only the carbon dioxide-rich absorbing solution 3 in one compartment stands out and holds a large amount of carbon dioxide, resulting in a decrease in the amount of carbon dioxide held by the carbon dioxide-rich absorbing solution 3 in the other compartments.

[0075] The operation when the movable body 51 is used as the second movable body 51 is generally similar to that described above. When used as the second movable body 51, the carbon dioxide lean absorbing liquid 4 is stored in the storage section 55 (first compartment 55A and second compartment 55B) instead of the carbon dioxide rich absorbing liquid 3. The carbon dioxide lean absorbing liquid 4, which is pumped up to the top of the storage section 55 by the action of the pump section 62, is sprayed in the form of a mist from the spray nozzle 84 toward the contact mechanism 85. As the exhaust gas passes through this contact mechanism 85, the carbon dioxide in the exhaust gas is absorbed by the carbon dioxide lean absorbing liquid 4. The carbon dioxide lean absorbing liquid 4 that has absorbed the carbon dioxide is returned to the first compartment 55A or the second compartment 55B of the storage section 55 via the third pipe section 72 or the fourth pipe section 86. The carbon dioxide lean absorbing liquid 4 is an absorbing liquid with a large carbon dioxide absorption capacity, and is therefore able to absorb carbon dioxide in the exhaust gas up to its limit. The exhaust gas from which the carbon dioxide has been removed is purified by the filter 75 and released into the atmosphere. As in the case where the mobile body 51 is used as the first mobile body 51, the driver may switch the connection state of the first three-way valve 82 between the first state and the second state at a predetermined timing, and may switch the connection state of the second three-way valve 83 between the third state and the fourth state.

[0076] In this embodiment, since the storage section 55 is provided with the first compartment 55A and the second compartment 55B, absorption liquids with different properties may be stored in each compartment, for example, by storing the carbon dioxide-rich absorption liquid 3 in the first compartment 55A and storing the carbon dioxide-lean absorption liquid 4 in the second compartment 55B. Even in this case, there is no problem in that the carbon dioxide-rich absorption liquid 3 in the first compartment 55A and the carbon dioxide-lean absorption liquid 4 in the second compartment 55B are mixed together while the moving body 51 is moving.

[0077] The above-described embodiments can be implemented with various substitutions and modifications. That is, while the mobile object 51 in the first and second embodiments is configured as a vehicle such as a tank truck, the present invention is not limited to this and may be configured as a vehicle other than a tank truck, such as a diesel locomotive, or as a ship such as a tanker. When the mobile object 51 is configured as a ship such as a tanker, the timing for switching the connection state of the first three-way valve 82 between the first state and the second state and the connection state of the second three-way valve 83 between the third state and the fourth state may be every time the mobile object 51 travels several thousand kilometers. Furthermore, a single invention can be configured by appropriately combining the components of the inventions of different embodiments. [Explanation of symbols]

[0078] 1. Gaseous carbon dioxide source 2. Process gas 3 Carbon dioxide-rich absorbent 4. Carbon dioxide lean absorbent 5. Carbon dioxide 10 Carbon dioxide capture system 11 Absorption tower 12 Regeneration Tower 31 Absorption Tower Site 32 Regeneration Tower Site 33 First Mobile Unit 34 Second Mobile Unit 51 Mobile 53 Internal combustion engine 55 Storage section 56 Absorption section 62 Pump section 65 Exhaust system

Claims

1. an absorption tower site where carbon dioxide supplied from a gaseous carbon dioxide supply source is absorbed into a carbon dioxide lean absorption solution to obtain a carbon dioxide rich absorption solution; a regeneration tower site that desorbs carbon dioxide from the carbon dioxide-rich absorbent to recover a carbon dioxide-lean absorbent and carbon dioxide; a first moving body having a first storage section and transporting the carbon dioxide-rich absorbing liquid stored in the first storage section from the absorption tower site to the regeneration tower site; a second moving body having a second storage section and transporting the carbon dioxide lean absorption liquid stored in the second storage section from the regeneration tower site to the absorption tower site; a first absorption section provided in the first moving body and configured to absorb carbon dioxide generated from the first moving body into the carbon dioxide-rich absorption liquid stored in the first storage section; a second absorption unit that is provided in the second moving body and absorbs carbon dioxide generated from the second moving body into the carbon dioxide lean absorption liquid stored in the second storage unit; Equipped with The first moving body and the second moving body are an internal combustion engine; a storage section for storing the carbon dioxide rich absorption liquid or the carbon dioxide lean absorption liquid; an exhaust system extending from the internal combustion engine and through which exhaust gas containing carbon dioxide is passed; an absorption unit provided in the exhaust system, the absorption unit absorbing the carbon dioxide in the exhaust gas into a carbon dioxide-rich absorption liquid or a carbon dioxide-lean absorption liquid supplied from the storage unit; Equipped with The carbon dioxide lean absorption liquid and the carbon dioxide rich absorption liquid are absorption liquids containing an absorbent, the absorbent is an amine-based compound, The absorption unit either sprays the carbon dioxide-rich absorption liquid or the carbon dioxide-lean absorption liquid, which has been pressurized by the action of a pump unit, as a jet flow using a jet nozzle, causing the jet to incorporate the carbon dioxide in the exhaust gas into the carbon dioxide-rich absorption liquid or the carbon dioxide-lean absorption liquid, or injects the carbon dioxide-rich absorption liquid or the carbon dioxide-lean absorption liquid, which has been pressurized by the action of a pump unit, into a porous contact mechanism in the form of a mist, and causes the exhaust gas to pass through the contact mechanism, thereby incorporating the carbon dioxide in the exhaust gas into the carbon dioxide-rich absorption liquid or the carbon dioxide-lean absorption liquid.

2. The carbon dioxide recovery system according to claim 1 , wherein the absorption unit includes the pump unit to which driving force is supplied from the internal combustion engine.

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