Carbon dioxide compression method using high-pressure electrolysis

Abstract

1. A method for compressing carbon dioxide CO2, comprising: a) using a high-pressure electrolyzer to produce a high-pressure oxygen gas stream and a high-pressure hydrogen gas stream; and b) supplying the CO2 stream to a reciprocating positive displacement pump having a reciprocating member, and supplying the high-pressure oxygen gas stream as a drive gas to actuate the reciprocating member and compress the CO2 to obtain a high-pressure CO2 stream.

Description

[Technical Field]

[0001] The present disclosure relates generally to electrolysis. [Background technology]

[0002] Water electrolysis is a process in which water is converted into hydrogen and oxygen gases using electricity. The hydrogen gas thus obtained can be reacted with carbon to produce methane gas. WO 2019 / 057764 discloses a system of this type. It is also known to use carbon dioxide to mix with hydrogen gas, as disclosed in U.S. Patent Application Publication No. 2019 / 0210872. Summary of the Invention

[0003] When producing methane gas, it is desirable to react hydrogen gas with carbon dioxide under high pressure to make the reaction more efficient. When the reaction is carried out under high pressure and heat, efficiencies of up to 98% can be achieved.

[0004] The increased efficiency allows the reactor to be smaller and still provide the same production output as a larger reactor.

[0005] The hydrogen gas stream exiting the electrolyzer, if produced by a high-pressure electrolyzer, is already at high pressure, and therefore does not need to be further compressed for reaction with carbon dioxide. However, the carbon dioxide may need to be compressed, which consumes energy.

[0006] In view of the above, it is a general object of the present disclosure to provide a method for compressing carbon dioxide that solves or at least mitigates the above-mentioned problems.

[0007] Another object is to provide a synthetic hydrocarbon gas production system.

[0008] Thus, according to a first aspect of the present disclosure, there is provided a method of compressing carbon dioxide CO2, the method comprising: a) producing a high-pressure oxygen gas stream and a high-pressure hydrogen gas stream using a high-pressure electrolyzer; and b) supplying the CO2 stream to a reciprocating positive displacement pump comprising a reciprocating member, actuating the reciprocating member and providing the high-pressure oxygen gas stream as a drive gas to compress the CO2 to obtain the high-pressure CO2 stream.

[0009] Therefore, high-pressure oxygen gas is used to pressurize the CO2. Thus, most of the energy generated by the high-pressure electrolyzer is utilized. No additional external energy is required to compress the CO2. Therefore, a more energy-efficient process is obtained.

[0010] The CO2 may be CO2 gas.

[0011] One embodiment includes c) reacting high pressure CO with high pressure hydrogen gas to obtain synthetic hydrocarbon gas. Thus, the production of synthetic hydrocarbon gas can be made more efficient using a high pressure electrolyzer.

[0012] The synthetic hydrocarbon gas may be methane gas.

[0013] One embodiment includes providing a water flow to a second reciprocating positive displacement pump having a second reciprocating member, and providing a high-pressure oxygen gas flow as a drive gas to actuate the second reciprocating member and compress the water to obtain a compressed water flow.

[0014] According to one embodiment, the second reciprocating positive displacement pump is a piston pump or a plunger pump. The second reciprocating member may be a piston or a plunger.

[0015] One embodiment includes feeding a compressed water stream as an electrolyte into a high-pressure electrolyzer to produce a high-pressure oxygen gas stream and a high-pressure hydrogen gas stream.

[0016] Therefore, the high-pressure oxygen gas produced by the high-pressure electrolyzer can be fed back and used to pressurize the water used as the electrolyte, which also ensures that the process is energy efficient.

[0017] According to one embodiment, the high pressure is a pressure of at least 35 bar. The high pressure can be, for example, a pressure of at least 50 bar, at least 100 bar, at least 200 bar, at least 300 bar, at least 350 bar, or at least 400 bar.

[0018] According to one embodiment, the reciprocating positive displacement pump is a piston pump or a plunger pump. The reciprocating member may be a piston or a plunger.

[0019] One embodiment comprises generating a CO2 stream for feeding in step b) by thermal decomposition of calcium carbonate.

[0020] This provides an environmentally friendly way to obtain CO2 for reaction with high-pressure hydrogen gas, which may be particularly beneficial in large-scale synthetic hydrocarbon gas production.

[0021] The pyrolysis reaction leaves lime, or calcium oxide, as a by-product. Calcium oxide can absorb carbon dioxide from ambient air when it comes into contact with the air. This makes the cycle carbon neutral. Therefore, by using this method to produce synthetic hydrocarbon gases or fuels from synthetic hydrocarbon gases, less carbon dioxide is produced using the gas / fuel, and by producing lime, the same amount of carbon dioxide would be absorbed from the atmosphere if released.

[0022] Calcium oxide can be used in cement production or similar industrial applications. In this case, the process of producing synthetic hydrocarbon gases would be carbon negative. Typically, cement plants use fossil fuels to produce lime from limestone. The fossil fuels and the calcination of limestone release carbon dioxide into the air. The use of green lime can reduce carbon dioxide emissions from fuel combustion and limestone combustion. Therefore, the use of by-product lime, i.e., green lime, creates a negative carbon footprint.

[0023] Alternatively, the by-product lime can be released back into the ocean, making acidic seawater more alkaline, thus changing the water's pH back from acidic to alkaline again. This means that the seawater can then absorb more carbon dioxide from the air as a natural process while returning its pH to normal, thereby helping the marine environment, especially sea life that can only thrive in slightly alkaline water.

[0024] Calcium carbonate may be contained in limestone.

[0025] Limestone is very good at absorbing carbon dioxide from the atmosphere. 10 kilograms of limestone can produce about 9 kilograms of carbon dioxide in a pyrolysis reaction. Therefore, limestone is a very good source of carbon dioxide.

[0026] According to a second aspect of the present disclosure, there is provided a synthetic hydrocarbon gas generation system comprising: a high-pressure electrolyzer having an oxygen gas outlet and a hydrogen gas outlet, the high-pressure electrolyzer configured to produce a high-pressure oxygen gas stream discharged through the oxygen gas outlet and a high-pressure hydrogen gas stream discharged through the hydrogen gas outlet; a CO inlet configured to receive a CO stream; a CO outlet; a high-pressure gas inlet connected to the oxygen gas outlet; and a reciprocating positive displacement pump operated by the high-pressure oxygen gas as a drive gas, the pump comprising a reciprocating member configured to compress CO to obtain a high-pressure CO stream discharged through the CO outlet.

[0027] One embodiment includes a reactor connected to a CO2 outlet and a hydrogen gas outlet, the reactor configured to react high pressure CO2 with high pressure hydrogen gas to obtain a synthetic hydrocarbon gas.

[0028] One embodiment includes a second reciprocating positive displacement pump including a water inlet configured to receive a water flow, a water outlet, a second high-pressure gas inlet connected to the oxygen gas outlet, and a second reciprocating member actuated by the high-pressure oxygen gas to compress the water to obtain a high-pressure water flow that is discharged through the water outlet.

[0029] According to one embodiment, the high pressure electrolyzer has an electrolysis water inlet, and the water outlet is connected to the electrolysis water inlet to supply high pressure water as an electrolyte to the high pressure electrolyzer.

[0030] According to one embodiment, the high pressure is a pressure of at least 35 bar.

[0031] According to one embodiment, the reciprocating positive displacement pump is a piston pump or a plunger pump.

[0032] One embodiment comprises a pyrolysis reaction chamber configured to pyrolyze calcium carbonate, the pyrolysis reaction chamber comprising a pyrolysis chamber outlet connected to a CO inlet of a reciprocating positive displacement pump, the pyrolysis reaction chamber configured to pyrolyze calcium carbonate into CO and calcium oxide.

[0033] One embodiment comprises a heating device configured to heat the pyrolysis reaction chamber to a temperature at or above the pyrolysis temperature of calcium carbonate or limestone.

[0034] In general, all terms used in the claims should be interpreted according to their ordinary meaning in the art unless otherwise expressly defined herein. All references to "a, an, the" element, apparatus, component, means, step, etc. should be interpreted broadly as referring to at least one instance of the element, apparatus, component, means, step, etc., unless otherwise specified. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

[0035] Examples of the inventive concept will now be described, by way of example, with reference to the accompanying drawings, in which: [Brief explanation of the drawings]

[0036] [Figure 1] FIG. 1 is a schematic diagram illustrating an example of a synthetic hydrocarbon gas production system. [Figure 2] FIG. 2 is a schematic diagram of another example of a synthetic hydrocarbon gas production system. [Figure 3] FIG. 3 is a schematic diagram of another example of a synthetic hydrocarbon gas production system. [Figure 4] FIG. 4 is a flow chart of a method for compressing CO2. DETAILED DESCRIPTION OF THE INVENTION

[0037] The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which specific embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided as examples so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout the specification.

[0038] 1 shows an example of a synthetic hydrocarbon gas production system 1-1. The synthetic hydrocarbon gas production system 1-1 includes a high-pressure electrolyzer 3, a reciprocating positive displacement pump 5, and a reactor 7. The high-pressure electrolyzer 3 may be an alkaline water high-pressure electrolyzer.

[0039] The high-pressure electrolyzer 3 has an electrolyte inlet 3a, a hydrogen gas outlet 3b, and an oxygen gas outlet 3c. The electrolyzer 3 may include multiple electrolytic cells arranged in a stacked configuration. The electrolyte inlet 3a is fluidly connected to the electrolytic cells so that electrolyte received through the electrolyte inlet 3a can flow into the electrolytic cells. Each electrolytic cell includes a cathode and an anode for producing high-pressure hydrogen gas and high-pressure oxygen gas from the electrolyte. The high-pressure hydrogen gas from all the electrolytic cells is collected inside the high-pressure electrolyzer 3 as a high-pressure hydrogen gas stream. The hydrogen gas outlet 3b is configured to discharge a high-pressure hydrogen gas stream 9 from the high-pressure electrolyzer 3. The high-pressure oxygen gas from all the electrolytic cells is collected inside the high-pressure electrolyzer 3 as a high-pressure oxygen gas stream. The oxygen gas outlet 3c is configured to discharge a high-pressure oxygen gas stream 11 from the high-pressure electrolyzer 3.

[0040] The high-pressure electrolyzer 3 may be equipped with a pressure compensation device such as that described in EP 3543375. The pressure compensation device is configured to equalize the pressure difference within the high-pressure electrolyzer 3 caused by the production of the high-pressure hydrogen gas stream 9 and the high-pressure oxygen gas stream 11.

[0041] The high-pressure electrolyzer 3 may be supplied with a high-pressure water stream 19 as an electrolyte. The water may be alkaline water. The high-pressure electrolyzer 3 is configured to be connected to an electrolyte source that supplies a high-pressure water stream via the electrolyte inlet 3a. In this example, the high-pressure water may be generated by, for example, a pump or a compressor.

[0042] The reciprocating positive displacement pump 5 has a CO2 inlet 5a, a high-pressure gas inlet 5b, and a CO2 outlet 5c. The CO2 inlet 5a is configured to be connected to a CO2 source, thereby enabling the reciprocating positive displacement pump 5 to receive a CO2 stream 6. The high-pressure gas inlet 5b is connected to the oxygen gas outlet 3c of the high-pressure electrolyzer 3, thus enabling the reciprocating positive displacement pump 5 to receive a high-pressure oxygen gas stream 11 from the high-pressure electrolyzer 3.

[0043] The CO2 outlet 5c is connected to the reactor 7. In particular, the reactor 7 has a CO2 reactor inlet 7b, and the CO2 outlet 5c is connected to the CO2 reactor inlet 7b.

[0044] The reciprocating positive displacement pump 5 comprises a reciprocating member 5d, such as a piston or plunger, configured to reciprocate inside the reciprocating positive displacement pump 5. A high-pressure oxygen gas stream 11 is configured to act as a drive gas for actuating the reciprocating member 5d to compress a CO2 stream 6 entering the reciprocating positive displacement pump 5 via a CO2 inlet 5a. A CO2 outlet 5c is configured to discharge a high-pressure CO2 stream 15 to the reactor 7. To this end, the high-pressure oxygen gas stream 11 is used to compress the CO2 stream 6 to obtain a high-pressure CO2 stream 15.

[0045] The high pressure CO2 stream 15 may be a high pressure CO2 gas stream.

[0046] Reactor 7 has a hydrogen gas inlet 7a connected to the hydrogen gas outlet 3b of high-pressure electrolyzer 3. Reactor 7 is configured to react a high-pressure CO stream 15 with a high-pressure hydrogen stream 9 to obtain a synthetic hydrocarbon gas 13, such as methane. Reactor 7 has a reactor outlet 7c configured to discharge the synthetic hydrocarbon gas stream 13.

[0047] The reactor 7 may include a reactor heater, which may include an electric heater and / or may be configured to utilize waste heat from a power or manufacturing plant, so that the high pressure hydrogen gas 9 reacts with the high pressure CO 15 at elevated temperatures. The reactor heater may be configured to heat the reactor 7 to a temperature of at least 150°C, such as a temperature in the range of 180-240°C, for example, to a temperature in the range of 150-250°C.

[0048] Reactor 7 may contain a catalyst, such as an iron oxide based catalyst.

[0049] By reacting hydrogen gas with CO2 under high pressure and heating, synthetic hydrocarbon gas production efficiencies of approximately 98% can be achieved. Furthermore, the cost-effectiveness of synthetic hydrocarbon gas production can be improved by 25-35%, especially when combined with the use of calcium carbonate as a CO2 source.

[0050] 2 shows another example of a synthetic hydrocarbon gas production system 1-2. The synthetic hydrocarbon gas production system 1-2 is similar to the synthetic hydrocarbon gas production system 1-1. However, the synthetic hydrocarbon gas production system 1-2 includes a second reciprocating positive displacement pump 17. The second reciprocating positive displacement pump 17 includes a water inlet 17a, a second high-pressure gas inlet 17b, and a water outlet 17c.

[0051] The second reciprocating positive displacement pump 17 includes a second reciprocating member 17d, such as a piston or plunger, configured to reciprocate within the second reciprocating positive displacement pump 17. The high-pressure oxygen gas stream 11 is configured to actuate the second reciprocating member 17d and act as a driving gas to compress the water stream 16 entering the second reciprocating positive displacement pump 17 via the water inlet 17a, thereby obtaining a high-pressure water stream 19. The water outlet 17c is connected to the electrolyte inlet 3a of the high-pressure electrolyzer 3. The water outlet 17c is configured to discharge the high-pressure water stream 19 to the high-pressure electrolyzer 3. Thus, the high-pressure oxygen gas stream 11 is used to compress the water stream 16 to obtain the high-pressure water stream 19. In this example, the high-pressure oxygen stream 11 is used to compress the water stream 16 and compress the CO2 stream 6, as described above.

[0052] 3 shows another example of a synthetic hydrocarbon gas generation system 1-3. The synthetic hydrocarbon gas generation system 1-3 may be configured as the synthetic hydrocarbon gas generation system 1-1 or the synthetic hydrocarbon gas generation system 1-2. However, the synthetic hydrocarbon gas generation system 1-3 also includes a thermal decomposition reaction chamber 21. The thermal decomposition reaction chamber 21 may be a vacuum chamber. The thermal decomposition reaction chamber 21 is configured to receive calcium carbonate 23. The calcium carbonate 23 may be contained in limestone. Therefore, the thermal decomposition reaction chamber 21 may be configured to receive limestone.

[0053] The synthetic hydrocarbon gas production system 1-3 includes a heating device 21a configured to heat the thermal decomposition reaction chamber 21. The heating device 21a may be configured to heat the calcium carbonate 23 or limestone disposed in the thermal decomposition reaction chamber 21 to a temperature equal to or higher than the thermal decomposition temperature of the calcium carbonate 23 or limestone.

[0054] The heating device 21a may be, for example, an electric heating device including electrodes. The synthetic hydrocarbon gas production system 1-3 may include one or more renewable energy sources, such as solar cells and / or wind turbines and / or wave energy converters, configured to power the electric heating device. Alternatively, the heating device 21a may be a fuel-based heating device.

[0055] The pyrolysis reaction chamber 21 includes a pyrolysis reaction chamber outlet 21b configured to exhaust CO2 generated in the pyrolysis reaction chamber 21. In this example, the pyrolysis reaction chamber outlet 21b is connected to a CO2 inlet 5a. A CO2 stream 6 is directed from the pyrolysis reaction chamber 21 to a CO2 inlet 5a of a reciprocating positive displacement pump 5. The CO2 stream 6 is compressed by the reciprocating positive displacement pump 5 as described above.

[0056] FIG. 4 shows a method for producing synthetic hydrocarbon gas using synthetic hydrocarbon gas production systems 1-1, 1-2, and 1-3.

[0057] If a pyrolysis reaction chamber 21 is used, calcium carbonate 23, for example in the form of limestone, is first placed in the pyrolysis reactor chamber 21. A vacuum or sub-ambient pressure can then be created within the pyrolysis reactor chamber 21.

[0058] The calcium carbonate 23 is heated to a temperature at least corresponding to the thermal decomposition temperature of calcium carbonate, which may be 600°C or higher, such as above 800°C, for example at least 840°C, such that the calcium carbonate 23 in the pyrolysis reactor chamber 21 releases CO2 during the pyrolysis reaction or calcination. Calcium oxide or quicklime is formed in the pyrolysis reactor chamber 21 as a by-product of the pyrolysis reaction.

[0059] The CO2 formed in the pyrolysis reaction exits or flows out of the pyrolysis reactor chamber 21 through pyrolysis reaction chamber outlet 21b and into the reciprocating positive displacement pump 5.

[0060] Once all of the calcium carbonate 23 has reacted in the pyrolysis reaction, approximately 90% of the calcium carbonate 23 will be converted to carbon dioxide, with the remainder being solid calcium oxide. The by-product calcium oxide is now located within the pyrolysis reaction chamber 21 and can be removed once all of the calcium carbonate 23 has reacted. The calcium oxide may be used, for example, to make cement, or may be released into the ocean to neutralize its acidity. Here, both the carbon dioxide and the only by-product calcium oxide can be fully utilized.

[0061] If an alternative CO2 source other than the pyrolysis reaction chamber 21 and calcium carbonate 23 described above is used, CO2 stream 6 enters reciprocating positive displacement pump 5 from the CO2 source via CO2 inlet 5a.

[0062] In step a), a high-pressure oxygen gas stream 11 and a high-pressure hydrogen gas stream 9 are produced by a high-pressure electrolyzer 3. The high-pressure oxygen gas stream 11 and the high-pressure hydrogen gas stream 9 are produced by electrolysis of a high-pressure water stream 19 that enters the high-pressure electrolyzer 3 via an electrolyte inlet 3a.

[0063] In step b), a high-pressure oxygen gas stream 11 is supplied to a reciprocating positive displacement pump 5. The high-pressure oxygen stream 11 is supplied to a high-pressure gas inlet 5b of the reciprocating positive displacement pump 5. A CO2 stream 6 is also supplied to the reciprocating positive displacement pump 5. The high-pressure oxygen gas 11 is used as a driving gas to operate a reciprocating member 5d. As a result, the CO2 6 in the reciprocating positive displacement pump 5 is compressed by the reciprocating positive displacement pump 5 and discharged.

[0064] A high pressure hydrogen gas stream 9 is fed to the reactor 7 .

[0065] In step c), the high pressure CO2 15 reacts with high pressure hydrogen gas 9 in reactor 7. This produces synthetic hydrocarbon gas 13.

[0066] Step c) may comprise reacting high pressure CO2 with high pressure hydrogen gas 9 at a temperature of at least 150°C, for example at a temperature in the range of 150-250°C, or at a temperature in the range of 180-240°C.

[0067] The synthetic hydrocarbon gas 13, i.e. methane gas, may be used as is or may be processed to obtain liquid fuels such as methanol, diesel or gasoline.

[0068] In the example utilizing synthetic hydrocarbon gas production system 1-3, high pressure oxygen gas 11 is also fed back to second reciprocating positive displacement pump 17 to compress water stream 16 to obtain high pressure water stream 19.

[0069] Instead of using high pressure oxygen gas as the drive gas, any other high pressure gas, such as high pressure air, may be used to actuate the reciprocating members of the reciprocating positive displacement pump and / or the second reciprocating positive displacement pump, although this is outside the scope of the claims.

[0070] The inventive concept has been described above primarily with reference to a few examples. However, as will be readily apparent to those skilled in the art, other embodiments besides those disclosed above are equally possible within the scope of the inventive concept as defined by the appended claims.

Claims

1. Carbon dioxide, CO ２ 1. A method for compressing a a) producing a high pressure oxygen gas stream (11) and a high pressure hydrogen gas stream (9) using a high pressure electrolyzer (3); b) CO2 is pumped into a reciprocating positive displacement pump (5) having a reciprocating member (5d). ２ Stream (6) is supplied to operate the reciprocating member (5d) and CO ２ (6) is compressed to produce high-pressure CO ２ supplying a high pressure oxygen gas stream (11) as a driving gas to obtain a stream (15); A method comprising:

2. c) High-pressure CO ２ 10. The method of claim 1, comprising reacting (15) with high pressure hydrogen gas (9) to obtain synthetic hydrocarbon gas (13).

3. 3. The method of claim 1, further comprising: supplying the water flow (16) to a second reciprocating positive displacement pump (17) having a second reciprocating member (17d), and supplying the high-pressure oxygen gas flow (11) as a driving gas to actuate the second reciprocating member (17d) and compress the water to obtain a compressed water flow (19).

4. 4. The method of claim 3, wherein the second reciprocating positive displacement pump (17) is a piston pump or a plunger pump.

5. 5. The method of claim 3 or 4, comprising feeding a compressed water stream (19) as electrolyte to a high-pressure electrolyzer (3) to produce a high-pressure oxygen gas stream (11) and a high-pressure hydrogen gas stream (9).

6. 6. The method of any one of claims 1 to 5, wherein the high pressure is a pressure of at least 35 bar.

7. 7. The method according to any one of claims 1 to 6, wherein the reciprocating positive displacement pump (5) is a piston pump or a plunger pump.

8. CO for supplying in step b) by thermal decomposition of calcium carbonate (23) ２ 8. The method of any one of claims 1 to 7, comprising generating a stream (6).

9. A synthetic hydrocarbon gas production system (1-1, 1-2, 1-3), comprising: a high-pressure electrolyzer (3) having an oxygen gas outlet (3c) and a hydrogen gas outlet (3b), the high-pressure electrolyzer (3) being configured to produce a high-pressure oxygen gas stream (11) discharged through the oxygen gas outlet (3c) and a high-pressure hydrogen gas stream (9) discharged through the hydrogen gas outlet (3b); CO ２ configured to receive a CO ２ Entrance (5a), CO ２ Export (5c), a high-pressure gas inlet (5b) connected to an oxygen gas outlet (3c); and It is operated by high pressure oxygen gas (11) as the driving gas, and CO ２ (6) is compressed to CO ２ High pressure CO discharged through outlet (5c) ２ a reciprocating member (5d) configured to obtain a flow (15) a reciprocating positive displacement pump (5) comprising: A synthetic hydrocarbon gas production system (1-1, 1-2, 1-3) comprising:

10. CO ２ and a reactor (7) connected to the outlet (5c) and the hydrogen gas outlet (3b), the reactor (7) being configured to ２ The synthetic hydrocarbon gas production system (1-1, 1-2, 1-3) according to claim 9, configured to react the (15) with high-pressure hydrogen gas (9) to obtain a synthetic hydrocarbon gas (13).

11. a water inlet (17a) configured to receive a water flow (16); A water outlet (17c); a second high-pressure gas inlet (17b) connected to the oxygen gas outlet (3c); and a second reciprocating member (17d) configured to be actuated by the high pressure oxygen gas (11) and to compress the water (16) to obtain a high pressure water stream (19) that is discharged through the water outlet (17c); The synthetic hydrocarbon gas production system (1-2, 1-3) according to claim 9 or 10, comprising a second reciprocating positive displacement pump (17) comprising:

12. 12. The synthetic hydrocarbon gas production system (1-2, 1-3) according to claim 11, wherein the high-pressure electrolyzer (3) has an electrolyte inlet (3a), and the water outlet (17c) is connected to the electrolyte inlet (3a) to supply high-pressure water (19) to the high-pressure electrolyzer (3) as an electrolyte.

13. The synthetic hydrocarbon gas production system (1-1, 1-2, 1-3) according to any one of claims 9 to 12, wherein the high pressure is a pressure of at least 35 bar.

14. The synthetic hydrocarbon gas production system (1-1, 1-2, 1-3) according to any one of claims 9 to 13, wherein the reciprocating positive displacement pump (5) is a piston pump or a plunger pump.

15. The thermal decomposition reaction chamber (21) is configured to thermally decompose calcium carbonate, and the thermal decomposition reaction chamber (21) is configured to thermally decompose calcium carbonate. ２ A synthetic hydrocarbon gas production system (1-3) according to any one of claims 9 to 14, comprising a pyrolysis reaction chamber outlet (21b) connected to the inlet (5a).

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