CO2 recovery device

Abstract

A CO2 recovery device (1) comprises a reaction tank (10), a CO2 gas supplying unit (41), and a CO2 removed gas emitting unit (42). The reaction tank (10) brings CO2 gas into contact with an aqueous alkali metal hydroxide solution or an aqueous alkaline earth metal hydroxide solution. The CO2 gas supplying unit (41) supplies the CO2 gas into the reaction tank (10). The CO2 removed gas emitting unit (42) emits CO2 removed gas, being gas from which CO2 has been removed, from the reaction tank (10). The CO2 gas supplying unit (41) and the CO2 removed gas emitting unit (42) are detachably attached to the reaction tank (10).

Description

Technical Field

[0001] The present disclosure relates to a CO2 recovery device.

Background Art

[0002] In recent years, it has been required to suppress the emission of CO2 gas as a greenhouse gas, and various devices for recovering CO2 gas have been studied. For example, as a CO2 recovery device, there is one that reacts exhaust gas containing CO2, such as a power generation boiler, with an aqueous NaOH solution stored in a reaction tank to generate NaHCO3 or Na2CO3, thereby recovering CO2 from the exhaust gas. Then, NaHCO3, Na2CO3, and mixtures thereof generated by the CO2 recovery device can be used as resources. For example, Patent Document 1 discloses a configuration in which a reaction liquid obtained by ejecting CO2 gas into an aqueous NaOH solution in a large reaction tank is sequentially transported to a solid-liquid separation device and a drying device to obtain a product.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0004] In the configuration disclosed in Patent Document 1, the supply unit that supplies exhaust gas and the discharge unit that discharges the gas after removing CO2 are inserted into the reaction tank from the lid of the reaction tank and cannot be easily removed from the reaction tank. Therefore, when taking out the product from the reaction tank or introducing the reaction liquid into the reaction tank, the reaction tank cannot be easily moved, so it may take time to take out the product or introduce the reaction liquid. In particular, when using a small reaction tank, the frequency of taking out the product or introducing the reaction liquid is likely to increase, so it is likely to be time-consuming.

[0005] This disclosure aims to provide a CO2 recovery device that can reduce the effort required for removing the product and adding the reaction solution.

[0006] A first aspect of the present invention is a reaction vessel having an opening for contacting an aqueous alkali metal hydroxide solution or an aqueous alkaline earth metal hydroxide solution with CO2 gas, A CO2 gas supply unit that supplies the CO2 gas into the above-mentioned reaction vessel, A CO2 removal gas discharge unit discharges the CO2-removed gas from which CO2 has been removed from the above reaction vessel, A main body having a lid that covers the opening of the above-mentioned reaction vessel and to which the above-mentioned CO2 gas supply unit and the above-mentioned CO2 removal gas discharge unit are attached, The above CO 2 The gas is CO 2 A pump to transport gas to the gas supply section, The above CO 2 The CO is installed in a duct through which gas flows. 2 A thermoelectric element that converts the heat of a gas into electricity, A control unit that controls the drive of the pump using the power generated by the thermoelectric element, Equipped with, The above reaction vessel is detachably attached to the above main body, The CO2 gas supply unit and the CO2 removal gas discharge unit are detachable from the reaction tank and are configured to be inserted into the reaction tank through the opening in the CO2 recovery device. Furthermore, a second aspect of the present invention is a reaction vessel for contacting an aqueous alkali metal hydroxide solution or an aqueous alkaline earth metal hydroxide solution with CO2 gas, A CO2 gas supply unit that supplies the CO2 gas into the above-mentioned reaction vessel, A CO2 removal gas discharge unit discharges the CO2-removed gas from which CO2 has been removed from the above reaction vessel, A pump for transporting the above CO2 gas to the above CO2 gas supply unit, A thermoelectric element installed in a duct through which the above-mentioned CO2 gas flows, which converts the heat of the CO2 gas into electricity, The system includes a control unit that controls the drive of the pump using the power generated by the thermoelectric element, The CO2 gas supply unit and the CO2 removal gas discharge unit are detachably attached to the reaction tank in the CO2 recovery device. 。 [Effects of the Invention]

[0007] In the above-described CO2 recovery system, the CO2 gas supply unit and the CO2 removal gas discharge unit are detachably attached to the reaction vessel. Therefore, the reaction vessel can be moved or removed as needed when removing the product or adding the reaction solution. This reduces the effort required when removing the product or adding the reaction solution.

[0008] As described above, according to the above embodiment, a CO2 recovery apparatus can be provided that reduces the effort required for removing the product and adding the reaction solution.

[0009] The symbols in parentheses in the claims indicate the correspondence with the specific means described in the embodiments described later, and do not limit the technical scope of this disclosure. [Brief explanation of the drawing]

[0010] The above-mentioned and other purposes, features, and benefits of this disclosure will be further clarified by the following detailed description with reference to the attached drawings. Those drawings are: [Figure 1] Figure 1 is a conceptual diagram showing the configuration of the CO2 recovery device in Embodiment 1. [Figure 2] Figure 2 is a conceptual cross-sectional view of the reaction vessel in Embodiment 1. [Figure 3] Figure 3 shows (a) a conceptual longitudinal section of the CO2 gas supply unit in Embodiment 1, and (b) a conceptual cross-sectional view of (a) at position IIIB-IIIb. [Figure 4] Figure 4 is a conceptual vertical cross-sectional view of the CO2 removal gas discharge section in Embodiment 1. [Figure 5] Figure 5 is a conceptual diagram showing the configuration of the CO2 recovery device in Embodiment 2. [Figure 6]FIG. 6 is a conceptual diagram showing the configuration of the CO2 recovery apparatus in Embodiment 3, [Figure 7] FIG. 7 is a conceptual diagram (a) showing the configuration of the CO2 recovery apparatus and (b) a perspective conceptual diagram in Embodiment 4, [Figure 8] FIG. 8 is a conceptual diagram (a) showing the state before connection of the lid member and (b) the state after connection of the lid member in Embodiment 4, [Figure 9] FIG. 9 is a cross-sectional conceptual diagram of the main body and the reaction tank in Embodiment 5, [Figure 10] FIG. 10 is a cross-sectional conceptual diagram (a) showing the state where the lid part is attached to the reaction tank and (b) the state where the lid part is removed from the reaction tank in Embodiment 6, [Figure 11] FIG. 11 is a conceptual diagram showing the configuration of the CO2 recovery apparatus in Embodiment 7, [Figure 12] FIG. 12 is a cross-sectional conceptual diagram (a) showing the state where the lid part is attached to the reaction tank and (b) the state where the lid part is removed from the reaction tank in Embodiment 8, [Figure 13] FIG. 13 is a cross-sectional conceptual diagram (a) of the opening / closing mechanism and (b) a cross-sectional conceptual diagram at the XIIIb-XIIIb position of (a) in Embodiment 8, [Figure 14] FIG. 14 is a top perspective view (a) of the blade member, a bottom perspective view (b) of the blade member, and a top perspective view (c) of the regulating plate in Embodiment 8, [Figure 15] FIG. 15 is a partial top perspective view of the reaction tank in Embodiment 8, [Figure 16] FIG. 16 is a conceptual diagram (a) showing the fully closed state, (b) the partially open state, and (c) the fully open state of the opening / closing mechanism in Embodiment 8, [Figure 17] FIG. 17 is a longitudinal cross-sectional conceptual diagram of the opening / closing mechanism in the modified form, [Figure 18] FIG. 18 is a conceptual diagram showing the configuration of the CO2 recovery apparatus in Embodiment 9, [Figure 19]Figure 19 is another conceptual diagram showing the configuration of the CO2 recovery device in Embodiment 9. [Modes for carrying out the invention]

[0011] (Embodiment 1) An embodiment of the CO2 capture system will be explained using Figures 1 to 4. As shown in Figure 1, the CO2 recovery device 1 of this embodiment 1 comprises a reaction tank 10, a CO2 gas supply unit 41, and a CO2 removal gas discharge unit 42. The reaction vessel 10 brings CO2 gas into contact with an aqueous solution of alkali metal hydroxide or an aqueous solution of alkaline earth metal hydroxide. The CO2 gas supply unit 41 supplies the CO2 gas into the reaction vessel 10. The CO2 removal gas discharge unit 42 discharges the CO2-removed gas from the reaction vessel 10. The CO2 gas supply unit 41 and the CO2 removal gas discharge unit 42 are detachably attached to the reaction vessel 10.

[0012] The CO2 recovery device 1 of this embodiment will be described in detail below. As shown in Figure 1, the CO2 recovery device 1 includes a reaction vessel 10. The reaction vessel 10 is configured to store an aqueous solution L inside. The material of the reaction vessel 10 is not particularly limited as long as it is alkali-resistant. In this embodiment, a polyethylene container, a so-called commercially available general-purpose poly tank, is used as the reaction vessel 10. This poly tank is intended for use as a container for transporting and storing liquids such as drinking water, kerosene, and wastewater. The capacity of the poly tank used as the reaction vessel 10 is not limited, but typically a 10 to 20 L tank can be used.

[0013] As shown in Figures 1 and 2, the reaction vessel 10 has a first opening 11 and a second opening 12. In Figures 1 and 2, the vertical direction is Z, the width direction is X, and the front-to-back direction is Y. In the vertical direction Z, the upper direction is Z1 and the lower direction is Z2. In the width direction X, one side is X1 and the direction opposite to X1 is X2. As shown in Figure 1, the reaction vessel 10 is mounted on a trolley 44 having tires 45 and is restrained to the trolley 44 by restraint bands 46 to prevent displacement relative to the trolley 44. The reaction vessel 10 can be easily moved via the trolley 44 even when the aqueous solution L is stored inside.

[0014] As shown in Figure 2, both the first opening 11 and the second opening 12 are provided on the upper surface of the reaction vessel 10, vertically upward Z1. On the upper surface of the reaction vessel 10, the first opening 11 is provided on one side X1 in the width direction X, and the second opening 12 is provided on the other side X2 in the width direction X. The opening direction of the first opening 11 is inclined to one side X1 in the width direction with respect to the vertical direction Z, and the opening direction of the second opening 12 is parallel to the vertical direction Z. The first opening 11 extends in a cylindrical shape and has a threaded portion 11a with screw grooves on its outer circumference. Similarly, the second opening 12 extends in a cylindrical shape and has a threaded portion 12a with screw grooves on its outer circumference. On the upper surface of the reaction vessel 10, a handle 15 is provided between the first opening 11 and the second opening 12. The handle 15 is integrally molded in the reaction vessel 10.

[0015] As shown in Figure 1, the first opening 11 is covered by the first lid member 16. As shown in Figure 3(a), the first lid member 16 has a threaded portion 16a on the inside that has a thread groove that conforms to the shape of the threaded portion 11a of the first opening 11. By placing the first lid member 16 over the first opening 11 shown in Figure 2 and screwing it in, the threaded portions 11a and 16a of both are screwed together, and the first lid member 16 is detachably attached to the reaction vessel 10 as shown in Figure 1.

[0016] As shown in Figures 1 and 3(a), the first lid member 16 is provided with a CO2 gas supply unit 41. The CO2 gas supply unit 41 comprises an outward extension 410 that extends outward from the reaction vessel 10 and is inserted through a through hole 161 formed in the first lid member 16, nozzles 411 to 413 that extend inward from the reaction vessel 10, and a connecting unit 414 that connects them. As shown in Figure 3(a), the outward extension 410 branches into three nozzles 411 to 413 at the connecting unit 414. The outward extension 410 is loosely fitted into the through hole 161 and is not fixed to the first lid member 16. This prevents the outward extension 410 from rotating even when the first lid member 16 is rotated when attaching the first lid member 16 to the first opening 11. Furthermore, a cylindrical bush 162 is provided in the through hole 161, and airtightness between the outward extension portion 410 and the first cover member 16 is maintained.

[0017] As shown in Figure 3(a), the CO2 gas supply unit 41 has a first nozzle section 411, a second nozzle section 412, and a third nozzle section 413, with their lengths increasing in that order. As a result, as shown in Figure 1, the tips of the nozzle sections 411 to 413 are located at different vertical Z positions in the reaction vessel 10.

[0018] The three nozzle sections 411 to 413 are fixed in relative positions by a support plate 415. There are three support plates 415, with the first support plate 415a, the second support plate 415b, and the third support plate 415c positioned at equal intervals from the side closest to the first lid member 16. As shown in Figure 3(b), the nozzle sections 411 to 413 are inserted through through holes 416 provided in the first support plate 415a. As shown in Figure 3(a), the second nozzle section 412 and the third nozzle section 413 are inserted through the second support plate 415b, and only the third nozzle section 413 is inserted through the third support plate 415c. The support plates 415 interfere with the gas released from the tips of the nozzle sections 411 to 413 as it moves upward within the aqueous solution L, thereby diffusing the gas into the aqueous solution L.

[0019] The CO2 gas supply unit 41 is configured to supply CO2 gas into the reaction vessel 10. In this embodiment, a duct (not shown) through which CO2 gas flows is connected to the CO2 gas supply unit 41, and the CO2 gas is released into the reaction vessel 10 by the pressure of the CO2 gas flowing through the duct.

[0020] As shown in Figure 1, the second opening 12 is covered by the second lid member 17. As shown in Figure 4, the second lid member 17 has a threaded portion 17a on the inside that has a thread groove that conforms to the shape of the threaded portion 12a of the second opening 12. Similar to the first lid member 16, the second lid member 17 is placed over the second opening 12 and screwed in, so that the threaded portions 12a and 17a of both are screwed together and the second lid member 17 is detachably attached to the reaction vessel 10.

[0021] As shown in Figures 1 and 4, the second lid member 17 is provided with a CO2 removal gas discharge section 42. The CO2 removal gas discharge section 42 extends outward from the reaction vessel 10 through a through hole 171 formed in the second lid member 17. The CO2 removal gas discharge section 42 is loosely fitted into the through hole 171 and is not fixed to the second lid member 17. This prevents the CO2 removal gas discharge section 42 from rotating even when the second lid member 17 is rotated when attaching the second lid member 17 to the second opening 12. A cylindrical bush 172 is provided in the through hole 171, maintaining airtightness between the CO2 removal gas discharge section 42 and the second lid member 17.

[0022] In this embodiment, as shown in Figure 4, a trapper 421 is provided on the reaction tank 10 side of the second lid member 17. An engaging claw 17b is provided on the reaction tank 10 side of the second lid member 17, and a projection 421b provided on the circumferential surface of the upper end of the trapper 421 engages with the engaging claw 17b, thereby attaching the trapper 421 to the second lid member 17 in a loosely fitted state. This prevents the trapper 421 from rotating even when the second lid member 17 is rotated when attaching the second lid member 17 to the second opening 12.

[0023] As shown in Figure 4, the trapper 421 has a gas intake section 422 that takes in gas from the reaction vessel 10. The gas taken in by the gas intake section 422 is discharged into the water W held inside the trapper 421. This allows the trapper 421 to capture any water-soluble harmful substances that may be present in the gas. The gas that has passed through the trapper 421 is then discharged from the CO2 removal gas discharge section 42.

[0024] In the reaction vessel 10, CO2 gas is bubbled into contact with the aqueous alkali metal hydroxide aqueous solution or alkaline earth metal hydroxide aqueous solution introduced into the reaction vessel 10. Examples of such aqueous solutions include NaOH, KOH, Ca(OH)2, and Mg(OH)2. In this embodiment, an aqueous NaOH solution is used as the aqueous solution L introduced into the reaction vessel 10.

[0025] In this specification, "CO2 gas" refers to a gas containing CO2 as a constituent component. This CO2 gas may contain only CO2 as a constituent component, or it may also contain unavoidable impurities. Furthermore, the CO2 gas may be a mixed gas in which CO2 and other substances are present as constituent components. The proportion of CO2 in the mixed gas is not limited, and the main component that accounts for the largest proportion in the mixed gas may be CO2, or it may be a substance other than CO2.

[0026] In this embodiment, the reactions shown in Equations 1 and 2 below are carried out in the reaction vessel 10 by supplying CO2 gas. 2NaOH+CO2→ Na2CO3+H2O (Formula 1) Na2CO3+CO2+H2O→ 2NaHCO3 (formula 2) This reaction yields NaHCO3, Na2CO3, and a mixture of NaHCO3 and Na2CO3 as products. The products are initially formed in aqueous solution in the reaction vessel 10, and can be recovered in solid form by dehydration and drying. The recovered products can then be utilized as resources.

[0027] Next, the effects and advantages of the CO2 recovery device 1 of this embodiment will be described in detail. In the CO2 recovery apparatus 1 of this embodiment, the CO2 gas supply unit 41 and the CO2 removal gas discharge unit 42 are detachably attached to the reaction vessel 10. Therefore, the reaction vessel 10 can be moved or removed as needed when removing the product or adding the reaction solution. This reduces the effort required when removing the product or adding the reaction solution.

[0028] Furthermore, in this embodiment, the reaction vessel 10 has a first opening 11 and a second opening 12. The CO2 gas supply unit 41 is provided on a first lid member 16 that is detachably attached to the first opening 11, and the CO2 removal gas discharge unit 42 is provided on a second lid member 17 that is detachably attached to the second opening 12. This allows the CO2 gas supply unit 41 and the CO2 removal gas discharge unit 42 to be attached to the reaction vessel 10 in a simple configuration and in a detachable manner.

[0029] Furthermore, in this embodiment, the reaction vessel 10 is configured to be interchangeable with respect to the first lid member 16 and the second lid member 17. This allows for improved efficiency in removing the product and adding the reaction liquid by removing the reaction vessel 10 from the first lid member 16 and the second lid member 17 after the product has been generated, and then attaching another reaction vessel 10 containing newly added reaction liquid to the first lid member 16 and the second lid member 17.

[0030] As described above, this embodiment provides a CO2 recovery apparatus that can reduce the effort required for removing the product and adding the reaction solution.

[0031] (Embodiment 2) In the above-described Embodiment 1, CO2 gas is released into the reaction vessel 10 by the pressure of CO2 gas flowing through a duct connected to the CO2 gas supply unit 41. However, as shown in Figure 5, the CO2 recovery device 1 of this Embodiment 2 is equipped with a pump 50 for transporting CO2 gas to the CO2 gas supply unit 41. Furthermore, in this Embodiment 2, the CO2 recovery device 1 is equipped with a solar panel system 51 that generates electricity to drive the pump 50, and a power storage device 52 that stores the electricity generated by the solar panel system 51. The pump 50 is energy-saving and can be started and driven with an amount of electricity that can be generated by the solar panel system 51. In Figure 5, the pump 50 takes in atmospheric air (air), as indicated by arrow F0, pressurizes it, and supplies the pressurized air as CO2 gas to the reaction vessel 10 via the CO2 gas supply unit 41, as indicated by arrow F1. In this Embodiment 2, components equivalent to those in Embodiment 1 are denoted by the same reference numerals and their descriptions are omitted.

[0032] In this second embodiment, the pump 50 can supply pressurized air to the reaction vessel 10, allowing for efficient CO2 extraction even from air with a low CO2 concentration. Furthermore, the pump 50 is energy-saving and driven by electricity generated by the solar panel system 51, thus eliminating the need to emit CO2 for its operation, or significantly reducing CO2 emissions. This contributes to reducing the overall CO2 emissions of the apparatus. This second embodiment also achieves the same effects as the first embodiment. If the voltage of the electricity generated by the solar panel system 51 is insufficient to drive the pump 50, a voltage booster may be provided upstream of the pump 50.

[0033] (Embodiment 3) As shown in Figure 6, the CO2 recovery device 1 of this third embodiment includes a pump 50 that transports CO2 gas to a CO2 gas supply unit 41, a thermoelectric element 55 installed in a duct 54 through which CO2 gas flows and which converts the heat of the CO2 gas into electricity, and a control unit 56 that controls the driving of the pump 50 with the electricity generated by the thermoelectric element 55. In this third embodiment, components equivalent to those in the previous embodiment are denoted by the same reference numerals and their descriptions are omitted.

[0034] In this third embodiment, high-temperature exhaust gas flows through the duct 54. As shown in Figure 6, the thermoelectric element 55 is attached to the outer surface of the duct 54. The form of the thermoelectric element 55 is not particularly limited and can be, for example, a Peltier element. The control unit 56 is configured to transmit the power converted from the heat of the duct 54 by the thermoelectric element 55 to the pump 50 as a drive signal to start driving the pump 50. In this third embodiment, the pump 50 is configured to start driving when it receives the drive signal and to stop driving when it does not receive the drive signal. The power consumed by the pump 50 for transporting CO2 gas is supplied by the solar panel system 51.

[0035] According to this third embodiment, the thermoelectric element 55 can convert the thermal energy of the exhaust gas flowing through the duct 54 into electricity, which can then be used as a drive signal to drive the pump 50. This reduces the power consumption required for controlling the pump 50, and consequently contributes to reducing CO2 emissions.

[0036] Furthermore, when high-temperature exhaust gas is not flowing through duct 54, duct 54 does not become hot, so no power is generated by the thermoelectric element 55, and no drive signal is transmitted. In this state, since no exhaust gas is flowing and there is no need to drive the pump 50, the wasteful consumption of power used to drive the pump 50 is suppressed.

[0037] In the CO2 recovery device 1 of Embodiment 3, as shown in Figure 6, the pump 50 takes in exhaust gas flowing through the duct 54, pressurizes it, and supplies it to the reaction vessel 10 as CO2 gas via the CO2 gas supply unit 41. If the high-temperature exhaust gas is brought into contact with the NaOH aqueous solution in the reaction vessel 10, the NaOH aqueous solution may rise excessively in temperature, causing the water in the solution to vaporize and generate water vapor, which may release the NaOH aqueous solution into the environment along with the water vapor. Also, if the product is NaHCO3, if high-temperature CO2 gas is supplied to the reaction vessel 10, the heat from the CO2 may cause the NaHCO3 to decompose and release CO2. For this reason, it is preferable that the CO2 gas supplied to the reaction vessel 10 is not high in temperature, for example, preferably 80°C or lower. In this Embodiment 3, the heat dissipation member 57 provided in the CO2 gas supply unit 41 lowers the temperature of the CO2 gas supplied to the reaction vessel 10, keeping the temperature of the CO2 gas below 80°C. The configuration of the heat dissipation member 57 is not particularly limited and can be composed of multiple heat dissipation fins or by applying a heat-dissipating paint to the outer surface of the CO2 gas supply unit 41. Furthermore, by making the shape of the CO2 gas supply unit 41 itself a shape that increases the surface area, the CO2 gas supply unit 41 itself may also function as the heat dissipation member 57. And in this third embodiment, the same effects and advantages as in the first and second embodiments are achieved.

[0038] (Embodiment 4) In embodiments 1 to 3 described above, a commercially available general-purpose poly tank was used as the reaction vessel 10, with a CO2 gas supply unit 41 provided on the first lid member 16 and a CO2 removal gas discharge unit 42 provided on the second lid member 17. Instead, in embodiment 4, as shown in Figures 7(a) and 7(b), a hollow cylindrical container is used as the reaction vessel 10. In the configuration of embodiment 3, components equivalent to those in embodiments 1 and 2 are denoted by the same reference numerals and their descriptions are omitted.

[0039] As shown in Figures 7(a) and 7(b), in this embodiment 4, the CO2 recovery device 1 has a main body 40. The main body 40 has a side portion 40c erected in the vertical direction Z, an upper portion 40a located above the side portion 40c, and a lower portion 40b located below the side portion 40c, and is configured to form a roughly U-shape. A CO2 gas supply unit 41, a CO2 removal gas discharge unit 42, and a sensor 43 are attached to the upper portion 40a. A reaction tank 10 is placed on the lower portion 40b.

[0040] As shown in Figures 7(a) and 7(b), the reaction vessel 10 has a hollow cylindrical shape. In this embodiment, the outer surface of the reaction vessel 10 is black. In Figure 7(b), the width direction is X, the front-to-back direction is Y, and the vertical direction is Z. In this embodiment, the upper part 40a of the main body 40 is slidable in the vertical direction Z, and the lower part 40b of the main body 40 is slidable in the front-to-back direction Y, allowing the reaction vessel 10 to be easily attached to and detached from the main body 40.

[0041] In this embodiment, as shown in Figure 7(a), a first opening 11, a second opening 12, and a third opening 13 are formed on the upper surface of the reaction vessel 10. As shown in Figures 7(a), 8(a), and 8(b), a gas supply nozzle 417, which forms the tip of the CO2 gas supply unit 41, is inserted through the first opening 11, and the gas supply nozzle 417 is fixed to the upper part of the reaction vessel 10. Furthermore, a threaded portion 11a, which has a screw groove formed on the outer circumferential surface of the cylindrical portion that forms the first opening 11, is provided.

[0042] As shown in Figure 7(a), a gas discharge nozzle 425, which forms the tip of the CO2 removal gas discharge section 42, is inserted through the second opening 12, and the gas discharge nozzle 425 is fixed to the upper part of the reaction vessel 10. Furthermore, a threaded portion 12a, which has a screw groove formed on the outer circumferential surface of the cylindrical portion that forms the second opening 12, is provided.

[0043] As shown in Figure 7(a), a sensor tip 431, which forms the tip of a sensor 43 for detecting the state of the aqueous solution L, is inserted through the third opening 13, and the sensor tip 431 is fixed to the upper part of the reaction vessel 10. Furthermore, a threaded portion 13a, which has a screw groove formed on the outer circumferential surface of the cylindrical portion that forms the third opening 13, is provided.

[0044] As shown in Figure 7(a), the first opening 11 is covered by the first lid member 16. As shown in Figure 8(a), the inner circumferential surface of the first lid member 16 has a threaded portion 16a having a thread groove that conforms to the shape of the threaded portion 11a of the first opening 11. Then, by placing the first lid member 16 over the first opening 11 and screwing it in, as shown in Figure 8(b), the threaded portions 11a and 16a of both are screwed together, and the first lid member 16 is detachably attached to the reaction vessel 10.

[0045] As shown in Figure 7(a), the first lid member 16 is provided with a CO2 gas supply unit 41. As shown in Figure 8(a), the CO2 gas supply unit 41 is loosely inserted through a through hole 161 formed in the first lid member 16 and extends outward to the reaction vessel 10. An enlarged diameter portion 41a is formed at the tip of the CO2 gas supply unit 41, preventing it from coming out of the first lid member 16. As a result, when attaching the first lid member 16 to the first opening 11, even if the upper part 40a of the main body 40, which was moved vertically upward Z1, is moved vertically downward Z2 as shown by arrow P, and the first lid member 16 is placed over the first opening 11 and rotated, the CO2 gas supply unit 41 will not rotate.

[0046] Although not shown in the figures, a second cover member 17 is detachably attached to the second opening 12, similar to the first opening 11 and the first cover member 16. This connects the CO2 removal gas discharge section 42 and the gas discharge nozzle section 425. Also, similar to the first opening 11 and the first cover member 16, a third cover member 18 is detachably attached to the third opening 13. This connects the CO2 removal gas discharge section 42 and the sensor tip 431. If a sensor 43 is not required, the configuration can be made without the sensor 43, the sensor tip 431, the third opening 13, and the third cover member 18.

[0047] In this fourth embodiment, the system includes a main body 40 to which a CO2 gas supply unit 41 and a CO2 removal gas discharge unit 42 are attached, and the reaction vessel 10 is detachably mounted on the main body 40. This makes it easy to move or remove the reaction vessel 10 as needed when removing the product or adding the reaction solution, even when a dedicated container is used as the reaction vessel 10, thereby reducing the effort required when removing the product or adding the reaction solution.

[0048] Furthermore, in this fourth embodiment, the CO2 gas supply unit 41, the CO2 removal gas discharge unit 42, and the sensor 43, which are fixed to the main body 40, are individually and detachably attached to the reaction vessel 10 via the first lid member 16, the second lid member 17, and the third lid member 18. Then, when necessary for removing the product or adding the reaction liquid, the reaction vessel 10 can be detached from the CO2 gas supply unit 41, the CO2 removal gas discharge unit 42, and the sensor 43 fixed to the main body 40 by removing the first lid member 16, the second lid member 17, and the third lid member 18. This makes it possible to make the reaction vessel 10 a cartridge type, making it easy to attach and detach from the main body 40, and also making the reaction vessel 10 replaceable relative to the main body 40. As a result, the effort required when removing the product or adding the reaction liquid can be reduced.

[0049] (Embodiment 5) In the above-described embodiment 4, the CO2 gas supply unit 41, the CO2 removal gas discharge unit 42, and the sensor 43, which are fixed to the main body 40, are detachably attached to the gas supply nozzle unit 417, the gas discharge nozzle unit 425, and the sensor tip unit 431, respectively, provided in the reaction tank 10, via lid members 16 to 18. Instead, in embodiment 5, as shown in Figure 9, the CO2 gas supply unit 41 is connected to the gas supply nozzle unit 417 by a relay pipe 418. The relay pipe 418 is made of flexible resin and is a bellows-shaped hollow tube. The connection portion between the relay pipe 418 and the CO2 gas supply unit 41 is configured to be detachable by detachable mechanisms 411a and 418a that can be easily attached to and detached from each other. Similarly, the connection portion between the relay pipe 418 and the gas supply nozzle unit 417 is configured to be detachable by detachable mechanisms 418b and 417b that can be easily attached to and detached from each other.

[0050] Furthermore, as shown in Figure 9, the CO2 removal gas discharge section 42 is also connected to the gas discharge nozzle section 425 by a relay pipe 426. The relay pipe 426 is made of flexible resin and is a bellows-shaped hollow tube. The connection between the relay pipe 426 and the CO2 gas supply section 41 is configured to be detachable by detachable mechanisms 421a and 426a that can be easily attached to and detached from each other. Similarly, the connection between the relay pipe 426 and the gas discharge nozzle section 425 is also configured to be detachable by detachable mechanisms 426b and 425b that can be easily attached to and detached from each other.

[0051] Furthermore, as shown in Figure 9, the sensor 43 is also connected to the sensor tip 431 by a sensor relay unit 432. The sensor relay unit 432 is flexible and has a length sufficiently longer than the distance between the sensor 43 and the sensor tip 431. The connection portion between the sensor relay unit 432 and the sensor is configured to be detachable by attachment / detachment mechanisms 43a and 432a that can be easily attached and detached from each other. Similarly, the connection portion between the sensor relay unit 432 and the sensor tip 431 is also configured to be detachable by attachment / detachment mechanisms 432b and 431b that can be easily attached and detached from each other. Note that in this embodiment 5, the other components are the same as in embodiment 4, so they are given the same reference numerals as in embodiment 4 and their descriptions are omitted.

[0052] In this 5th embodiment, as shown in Figure 9, the CO2 gas supply unit 41, the CO2 removal gas discharge unit 42, and the sensor 43, which are fixed to the main body 40, are individually and detachably attached to the reaction vessel 10 via relay pipes 418, 426, and a sensor relay unit 432, making it easy to install and remove the reaction vessel 10. Furthermore, this 5th embodiment also provides the same effects and advantages as the 4th embodiment.

[0053] (Embodiment 6) In embodiments 4 and 5 described above, a gas supply nozzle 417, a gas discharge nozzle 425, and a sensor tip 431 are provided in the reaction vessel 10, and a CO2 gas supply unit 41, a CO2 removal gas discharge unit 42, and a sensor 43 fixed to the main body 40 are connected to these. However, in embodiment 6, as shown in Figures 10(a) and 10(b), the top of the reaction vessel 10 is an open opening 11, and a lid 19 covering the opening 11 is provided on the back surface of the upper part 40a of the main body 40. The CO2 gas supply unit 41, the CO2 removal gas discharge unit 42, and the sensor 43 are fixed to both the main body 40 and the lid 19, passing through the lid 19 together with the main body 40. Figure 10(a) shows the lid 19 attached to the opening 11 of the reaction vessel 10, and Figure 10(b) shows the lid 19 removed from the opening 11 of the reaction vessel 10.

[0054] As shown in Figure 10(a), the CO2 gas supply unit 41, the CO2 removal gas discharge unit 42, and the sensor 43 are inserted into the reaction vessel 10 through the opening 11, and their respective tips are positioned inside the reaction vessel 10. Then, as shown in Figure 10(a), by moving the upper part 40a of the main body 40 vertically upward Z1 as indicated by the arrow Q, the CO2 gas supply unit 41, the CO2 removal gas discharge unit 42, and the sensor 43, which are fixed to the main body 40 together with the lid 19, can be removed from the reaction vessel 10, as shown in Figure 10(b).

[0055] As described above, in this embodiment 6, the reaction vessel 10 has an opening 11, and the CO2 gas supply unit 41 and the CO2 removal gas discharge unit 42 are configured to be inserted into the reaction vessel 10 through the opening 11. The main body 40 has a lid 19 that covers the opening 11 of the reaction vessel 10, and the CO2 gas supply unit 41 and the CO2 removal gas discharge unit 42 are attached to the lid 19. This allows for the simultaneous attachment and detachment of the CO2 gas supply unit 41 and the CO2 removal gas discharge unit 42 to the reaction vessel 10 and the closing and opening of the opening 11 by the lid 19, further reducing the effort required when attaching and detaching the reaction vessel 10 to the main body 40. It should be noted that this embodiment 6 can achieve the same effects as in embodiment 1.

[0056] (Embodiment 7) In the above-described embodiment 4, a sensor 43 is provided as shown in Figure 7(a). However, in this embodiment 7, the sensor 43 is not provided as shown in Figure 11. Instead of managing the amount of product generated by the sensor 43, the cumulative operating time of power generation in the solar panel system 5 or the cumulative operating time of the pump 50 is acquired to manage the amount of product generated, etc. For example, when the cumulative operating time reaches a predetermined time, it can be determined that all the NaOH in the aqueous solution L has reacted with CO2, and the aqueous solution L in the reaction vessel 10 can be replaced. This eliminates the need for power to drive the sensor 43, thus reducing power consumption and further suppressing CO2 emissions. Note that the aqueous solution L can be replaced by removing the reaction vessel 10 from the main body 40.

[0057] As shown in Figure 11, in this embodiment 7, the solar panel system 51 is provided on the upper surface of the upper part 40a of the main body 40. The pump 50 is configured to use power generated by the solar panel system 51 and stored in the energy storage device 52, which is then boosted by the booster 53. The booster 53 can be powered by the power generated by the solar panel system 51. A filter 58, indicated by F0, is provided upstream of the pump 50 to remove foreign matter from the intake air. The configuration of the filter 58 is not limited, and a known configuration can be used. In this embodiment 7, the outer surface of the reaction vessel 10 is black. In this embodiment 7, all components are provided on the main body 40, and the main body 40 is movable by tires 45 provided on the lower part 40b of the main body 40. In this embodiment 7, components equivalent to those in previous embodiments are given the same reference numerals and their descriptions are omitted.

[0058] In this embodiment 7, the same effects and advantages as those of the prior embodiments can be achieved.

[0059] (Embodiment 8) In the above-described embodiment 6 shown in Figures 10(a) and 10(b), the lid 19 covering the opening 11 of the reaction vessel 10 is provided on the back surface of the upper part 40a of the main body 40. However, this can be replaced with the embodiment 8 shown in Figures 12(a) and 12(b). Figure 12(a) shows the lid 19 attached to the opening 11 of the reaction vessel 10, and Figure 12(b) shows the lid 19 removed from the opening 11 of the reaction vessel 10. As shown in Figure 12(a), the lid 19 is provided at the lower end of the cylindrical sleeve 47. The lid 19 has an opening 191 into which the sleeve 47 is fitted. An opening / closing mechanism 60 is provided on the back side of the lid 19. As shown in Figure 12(b), when the lid 19 is removed from the opening 11 of the reaction vessel 10, the opening / closing mechanism 60 closes the front end of the CO2 gas supply unit 41. On the other hand, as shown in Figure 12(a), when the lid 19 is attached to the opening 11 of the reaction vessel 10, the opening / closing mechanism 60 is in an open state, opening the front end of the CO2 gas supply unit 41. In this embodiment, components equivalent to those in the previous embodiment are given the same reference numerals and their descriptions are omitted.

[0060] As shown in Figures 12(a) and 12(b), the sleeve portion 47 is cylindrical, and through holes 471 and 472 are provided at the upper end of the sleeve portion 47. The CO2 gas supply portion 41 and the CO2 removal gas discharge portion 42 are inserted through the through holes 471 and 472 with a small gap between them, and the CO2 gas supply portion 41 and the CO2 removal gas discharge portion 42 are movable vertically within the sleeve portion 47. The outer circumferential surfaces of the CO2 gas supply portion 41 and the CO2 removal gas discharge portion 42 are provided with retaining protrusions 473 and 474, respectively, which have an outer diameter larger than the through holes 471 and 472. These retaining protrusions 473 and 474 prevent the CO2 gas supply portion 41 and the CO2 removal gas discharge portion 42 from moving beyond their predetermined positions within the sleeve portion 47 and coming out of the sleeve portion 47.

[0061] As shown in Figures 13(a) and 13(b), the opening / closing mechanism 60 comprises a case 61, a vane member 62, and a regulating plate 63. As shown in Figure 13(b), the upper part of the case 61 is open, and the upper end 611 of the case 61 is connected to the lower end of the sleeve portion 47, communicating with the inside of the sleeve portion 47. The lower part of the case 61 is also open, forming an opening 612.

[0062] As shown in Figures 13(a) and 13(b), the blade members 62 are provided inside the case 61, and in this embodiment, five blade members 62 are provided. As shown in Figures 14(a) and 14(b), the blade members 62 are plate-like members with a substantially fan-shaped form, and a pivot pin 621 is inserted through the narrow portion in a plan view. As shown in Figure 14(b), a substantially arc-shaped groove 622 is formed on the back surface of the blade member 62, extending from the narrow portion to the wide portion in a plan view. As shown in Figure 13(a), the five blade members 62 are arranged so that their pivot pins 621 are located at equal intervals on the same circle, and as shown in Figure 13(b), they are attached to the case 61 via the pivot pins 621, and each blade member 62 is rotatable around its respective pivot pin 621.

[0063] As shown in Figure 13(b), the regulating plate 63 is located below the blade member 62. As shown in Figure 14(c), the regulating plate 63 is a substantially ring-shaped plate member. The regulating plate 63 has arc-shaped through portions 631 that penetrate in an arc along its inner circumferential surface. Five arc-shaped through portions 631 are formed and are located at equal intervals on the same circle. Regulating pins 632 are provided between adjacent arc-shaped through portions 631. The regulating pins 632 protrude vertically upward Z1, i.e., towards the blade member 62. A total of five regulating pins 632 are provided. The regulating plate 63 has outward projection portions 633 that protrude radially outward from its outer edge. As shown in Figures 13(a) and 13(b), the regulating plate 63 is positioned vertically downward Z2 of the blade members 62, with the pivot pins 621 of each of the five blade members 62 passing through the arc-shaped through-holes 631, and the regulating pins 632 fitting into the grooves 622 of each of the five blade members 62. Also, as shown in Figure 13(b), the outward projection 633 of the regulating plate 63 is inserted through a slit 613 provided in the side wall of the case 61 and protrudes outward from the case 61. The slit 613 is formed over a predetermined range in the circumferential direction.

[0064] On the other hand, as shown in Figure 15, an inner groove 111 is provided on the inner circumferential surface of the cylindrical portion that forms the opening 11 of the reaction vessel 10. This inner groove 111 is continuous in the circumferential direction toward the vertical downward Z2. The size of this inner groove 111 is such that the outward projection 633 of the regulating plate 63 can be inserted through it with a small gap.

[0065] Next, we will describe the movement of the blade member 62 when the lid 19 and opening / closing mechanism 60 are removed from the reaction vessel 10 as shown in Figure 12(b), and then attached to the reaction vessel 10 as shown in Figure 12(a). First, as shown in Figure 16(a), in the initial state where the lid 19 and opening / closing mechanism 60 have been removed from the reaction vessel 10, the regulating pin 632 of the regulating plate 63 is located at the end of the groove 622 of the blade member 62 that is closer to the pivot pin 621, and the pivot pin 621 of the blade member 62 is located at one end of the arc-shaped through portion 631 of the regulating plate 63. In this initial state, the five blade members 62 cover the opening 612 at the lower end of the case 61 shown in Figure 13(b), completely closing the opening 612.

[0066] Then, with the upper end 111a of the inner groove 111 shown in Figure 15 aligned with the outward projection 633 of the regulating plate 63 shown in Figure 13(a), the opening / closing mechanism 60 is inserted into the opening 11 of the reaction tank 10. As a result, the outward projection 633 moves circumferentially along the inner groove 111. That is, as shown in Figure 16(b), the outward projection 633 moves in the direction of arrow R, and the regulating plate 63 rotates in the direction of arrow R. As a result, the regulating pin 632 of the regulating plate 63 moves toward the end furthest from the pivot pin 621 in the groove 622 of the blade member 62, so that each blade member 62 rotates outward around the pivot pin 621. As a result, the opening 612, which was closed, gradually opens. It is observed that the pivot pin 621 of the blade member 62 moves relatively toward the other end within the arc-shaped penetration 631 as the regulating plate 63 rotates.

[0067] Subsequently, as shown in Figure 16(c), the regulating plate 63 rotates further in the direction of arrow R, and when the pivot pin 621 of the blade member 62 is positioned at the other end of the arc-shaped through-hole 631, the regulating pin 632 of the regulating plate 63 is positioned at the end of the groove 622 of the blade member 62 that is farther from the pivot pin 621. As a result, the blade member 62 rotates further outward around the pivot pin 621, and the opening 612 is completely opened, leaving the front end of the CO2 gas supply unit 41 open. Then, as shown in Figure 12(a), the lid 19 is installed by lowering the CO2 gas supply unit 41 and the CO2 removal gas discharge unit 42 into the reaction tank 10.

[0068] When removing the lid 19, the procedure is the reverse of the above procedure. That is, first, as shown in Figure 16(c), with the blade member 62 completely opening the opening 612, the CO2 gas supply unit 41 and the CO2 removal gas discharge unit 42 are pulled up from inside the reaction vessel 10 into the sleeve unit 47. Then, by pulling up the opening / closing mechanism 60, the opening 612, which was in an open state, is gradually closed by the five blade members 62 as shown in Figure 16(b). Then, as shown in Figure 16(a), after the opening 612 is completely closed and the tip side of the CO2 gas supply unit 41 is covered, the lid 19 and the opening / closing mechanism 60 are removed from the reaction vessel 10.

[0069] As described above, the opening / closing mechanism 60 forms an aperture in the opening 612 with five vane members 62 and controls the open / closed state of the opening 612. The opening 612 can also be manually controlled by manually moving the outward projection 633 in the direction of arrow R or the opposite direction to open and close the vane members 62. In this embodiment, the regulating plate 63 is biased in the direction opposite to arrow R by a biasing member (not shown) so that the initial state shown in Figure 16(a) is maintained when the lid 19 and the opening / closing mechanism 60 are removed from the reaction vessel 10.

[0070] According to this embodiment 8, the tip of the CO2 gas supply unit 41 is equipped with an opening / closing mechanism 60 that closes the tip of the CO2 gas supply unit 41 when the lid member 18 is removed from the opening 11, and opens the tip of the CO2 gas supply unit 41 when the lid member 18 is attached to the opening 11. As a result, even if aqueous solution L adhering to the tip of the CO2 gas supply unit 41 falls as droplets when the CO2 gas supply unit 41 is removed from the reaction vessel 10, the falling droplets remain inside the opening / closing mechanism 60 because it is in the closed state, preventing them from leaking to the outside. Furthermore, the droplets remaining inside the opening / closing mechanism 60 can be dropped into the reaction vessel 10 when the opening / closing mechanism 60 is opened when the CO2 gas supply unit 41 is reattached, thus preventing the droplets from leaking to the outside. Note that the droplets remaining inside the opening / closing mechanism 60 may be removed as appropriate by manually opening the opening / closing mechanism 60. This embodiment also provides the same effects as the previous embodiment.

[0071] Furthermore, a bubbling nozzle head 419 may be attached to the tip of the CO2 gas supply unit 41, as shown in the modified form in Figure 17. In this case, as shown in Figure 17, the CO2 gas supply unit 41 may be pulled up to close the opening / closing mechanism 60 while the nozzle head 419 is attached.

[0072] (Embodiment 9) In this embodiment 9, the sensor 43 in the configuration of embodiment 6 shown in Figure 10 is replaced with an electrolysis device 70 as shown in Figure 18. In this embodiment 9, components equivalent to those in embodiment 6 are denoted by the same reference numerals and their descriptions are omitted.

[0073] In this embodiment 9, as shown in Figure 18, the electrolysis apparatus 70 includes electrodes 71 and 72. The electrodes 71 and 72 are immersed in an aqueous solution L in the reaction vessel 10. The electrodes 71 and 72 are configured to be supplied with electricity generated by a solar panel system 51 stored in a power storage device 52. The electrodes 71 and 72 are fixed to the lid 19 and the upper part 40a of the main body 40 via a support part (not shown). As shown in Figure 19, by moving the upper part 40a of the main body 40 vertically upward Z1 as indicated by the arrow Q, the electrodes 71 and 72, along with the CO2 gas supply unit 41 and the CO2 removal gas discharge unit 42 fixed to the lid 19 and the main body 40, can be removed from the reaction vessel 10. Thus, the electrodes 71 and 72 can be attached to and detached from the reaction vessel 10. The material of the reaction vessel 10 is alkali-resistant and is not particularly limited, but may be stainless steel or made of metal with a surface treatment such as resin lining.

[0074] In this embodiment 9, in the initial state, an aqueous NaCl solution is stored in the reaction vessel 10 as an aqueous solution L. Then, by applying current to electrodes 71 and 72, the reaction shown in equation 3 below can be carried out by electrolysis. 2NaCl+H2O → 2NaOH+Cl2+H2 (Formula 3) This allows for the generation of an aqueous NaOH solution within the reaction vessel 10. The Cl2 gas and H2 gas produced in this reaction can be removed from the reaction vessel 10 via the CO2 removal gas discharge section 42 and collected by a predetermined filter or the like. A diaphragm, such as an ion exchange membrane, may be provided between electrodes 71 and 72. Providing such a diaphragm facilitates the separation of the Cl2 gas and H2 gas produced in the above reaction, and also makes it easier to stably extract the NaOH.

[0075] The concentration of the NaCl aqueous solution introduced into the reaction vessel 10 is not limited, but by using a high-concentration NaCl aqueous solution of 5% or more, a high-concentration NaOH aqueous solution can be obtained, thereby improving the CO2 recovery efficiency. If the voltage output from the solar panel system 51 and the energy storage device 52 is insufficient for electrolysis, a voltage booster can be used to boost the voltage to the required level before performing electrolysis.

[0076] NaOH aqueous solution is strongly alkaline, and high-concentration NaOH aqueous solution requires particular care in handling, while NaCl aqueous solution is neutral and easy to handle. Therefore, according to the configuration of this embodiment 9, since NaCl aqueous solution can be added to the reaction vessel 10 instead of NaOH aqueous solution, work efficiency is improved.

[0077] In this embodiment 9, a solar panel system 51 is used as a solar power generation device that generates electricity from sunlight and supplies power to the electrolysis device 70. This eliminates the need to emit CO2 to drive the electrolysis device 70, or reduces the amount of CO2 emitted. This contributes to reducing the overall CO2 emissions of the device.

[0078] In this embodiment 9, the electrolysis apparatus 70 is equipped with electrodes 71 and 72 that are detachably attached to the reaction vessel 10. This makes it easy to move or remove the reaction vessel 10 as needed when removing the product or adding the reaction solution. Therefore, the effort required when removing the product or adding the reaction solution can be reduced. And in this embodiment 9, the same effects and advantages as in embodiment 6 can be achieved.

[0079] This disclosure is described in accordance with embodiments, but it is understood that this disclosure is not limited to such embodiments or structures. This disclosure also encompasses various variations and variations within the equivalence range. In addition, various combinations and forms, as well as other combinations and forms that include only one, more, or fewer of those elements, fall within the scope and concept of this disclosure. For example, the opening and closing mechanism 60 in Embodiment 8 and the electrolysis apparatus 70 in Embodiment 9 may be applied to Embodiments 1 to 7.

Claims

1. Having an opening, CO2 is added to an aqueous alkali metal hydroxide solution or an aqueous alkaline earth metal hydroxide solution. ２ A reaction vessel into which gas is brought into contact, The above CO ２ CO2 supplying gas ２ Gas supply department, CO ２ CO2 has been removed. ２ CO2 is emitted as a removed gas. ２ The gas removal discharge section, The above reaction vessel covers the above opening and the above CO ２ Gas supply unit and the above CO ２ A main body having a lid to which a gas removal outlet is attached, A pump for transporting the above CO2 gas to the above CO2 gas supply unit, A thermoelectric element installed in a duct through which the above-mentioned CO2 gas flows, which converts the heat of the CO2 gas into electricity, A control unit that controls the drive of the pump using the power generated by the thermoelectric element, Equipped with, The above reaction vessel is detachably attached to the above main body, The above CO ２ gas supply unit and the above CO ２ removing gas discharge unit are detachable from the above reaction tank and are configured to be inserted into the above reaction tank from the above opening, CO ２ recovery device.

2. Add CO2 to an aqueous alkali metal hydroxide solution or an aqueous alkaline earth metal hydroxide solution. ２ A reaction vessel into which gas is brought into contact, The above CO ２ CO2 supplying gas ２ Gas supply department, CO ２ CO2 has been removed. ２ CO2 is emitted as a removed gas. ２ The gas removal discharge section, The above CO ２ The gas is CO ２ A pump to transport gas to the gas supply section, The above CO ２ The CO is installed in a duct through which gas flows. ２ A thermoelectric element that converts the heat of a gas into electricity, The system includes a control unit that controls the drive of the pump using the power generated by the thermoelectric element, The above CO ２ Gas supply unit and the above CO ２ The removal gas discharge unit is detachably attached to the above-mentioned reaction vessel, CO ２ Recovery device.

3. The above CO ２ Gas supply unit and the above CO ２ It is equipped with a main body to which a gas removal outlet is attached, The CO2 reactor described in claim 2 is detachably attached to the main body. ２ Recovery device.

4. The above reaction vessel has an opening, The above CO ２ Gas supply unit and the above CO ２ The removal gas discharge section is configured to be inserted into the reaction vessel through the opening described above. The above-mentioned main body has a lid portion that covers the above-mentioned opening of the above-mentioned reaction vessel, and the above-mentioned CO ２ Gas supply unit and the above CO ２ The CO2 removal gas discharge unit is attached to the CO2 removal gas discharge unit as described in claim 3. ２ Recovery device.

5. The above reaction vessel has a first opening and a second opening, The above CO ２ The gas supply unit is provided on a first lid member that is detachably attached to the first opening. The above CO ２ The CO removal gas discharge section is provided on a second lid member that is detachably attached to the second opening, as described in claim 2 or 3. ２ Recovery device.

6. The reaction vessel is configured to be interchangeable with respect to the first lid member and the second lid member, as described in claim 5. ２ Recovery device.

7. The above CO ２ The tip of the gas supply section contains the above CO ２ When the gas supply unit is removed from the reaction vessel, the CO ２ The tip of the gas supply section becomes blocked, resulting in the above CO ２ When the gas supply unit is attached to the above reaction vessel, the above CO ２ The CO2 according to any one of claims 1 to 6, which is provided with an opening / closing mechanism that opens the tip of the gas supply section to an open state. ２ Recovery device.

8. An electrolysis apparatus comprising: electrolyzing an aqueous NaCl solution stored in the above-mentioned reaction vessel to produce an aqueous NaOH solution as an alkali metal hydroxide solution in the above-mentioned reaction vessel; The CO2 according to any one of claims 1 to 7, comprising a solar power generation device that generates electricity from sunlight and supplies the electricity to the electrolysis device. ２ Recovery device.

9. The electrolysis apparatus described above is equipped with an electrode detachably provided in the reaction vessel, as described in claim 8 of CO2. ２ Recovery device.

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