Generation system and generation method

Abstract

Provided is a technology capable of improving the generation efficiency of hydrocarbon gas. This generation system comprises: a generation unit for generating a hydrocarbon gas by means of a catalytic reaction based on hydrogen gas and carbon dioxide gas, and discharging a discharge gas containing hydrogen gas, carbon dioxide gas, and hydrocarbon gas; a first supply unit for supplying a first raw material gas containing hydrogen gas and carbon dioxide gas to the generation unit; a first acquisition unit for acquiring the amount of hydrogen gas and the amount of carbon dioxide gas contained in the first raw material gas; a second supply unit for separating the hydrogen gas and carbon dioxide gas from the discharge gas and supplying a second raw material gas containing the separated hydrogen gas and carbon dioxide gas to the generation unit; a second acquisition unit for acquiring the amount of hydrogen gas and the amount of carbon dioxide gas contained in the second raw material gas; and a control unit for controlling the amount of hydrogen gas and the amount of carbon dioxide gas contained in the first raw material gas based on the amount of hydrogen gas and the amount of carbon dioxide gas contained in the second raw material gas.

Description

Generation System and Generation Method

[0001] The present invention relates to a generation system and a generation method.

[0002] CO

[0005] ,

[0004] , ２ ,

[0003] , , , , ２ In recent years, research and development of the reaction for synthesizing hydrocarbons using CO gas, CO gas, and mixed gas has been actively carried out as a technology contributing to decarbonization. The mixed gas is, for example, a gas containing H ２ , CO, and CO ２ . When synthesizing hydrocarbons having 1 to 4 carbon atoms by using CO ２ gas, CO gas, and mixed gas and adding H ２ gas, the reaction product contains hydrocarbons having 1 to 4 carbon atoms, unreacted raw material components (CO ２ , CO), and liquid hydrocarbons having a large carbon number. For example, when CO ２ is selected as the starting material, the components after the reaction contain unreacted CO ２ , and the unreacted CO ２ is used again as a reaction raw material by using a separation and recovery technique, improving the efficiency of the entire reaction process. When CO ２ and H ２ are chemically reacted, CO ２ contains CO as one of the by-products when it is the starting material. Also, in the so-called Fischer-Tropsch synthesis using CO as the starting material, CO ２ may be contained in the gas after the reaction as one of the by-products.

[0003] Patent Document 1 describes a method for producing a hydrocarbon gas having 4 or less carbon atoms, in which at least one of carbon dioxide, carbon monoxide, and hydrogen is separated as a recycle gas and the recycle gas is mixed with the raw material gas. Patent Document 2 describes a method for producing a hydrocarbon gas having 5 or less carbon atoms, in which the H ２ / CO ratio of the synthesis gas supplied to the hydrocarbon production unit is adjusted to a value suitable for the Fischer-Tropsch reaction.

[0004] International Publication No. 2022 / 138910 International Publication No. 2022 / 264676

[0005] The technologies described in Patent Documents 1 and 2 do not achieve sufficient hydrocarbon gas production efficiency, and there are issues with hydrocarbon gas production efficiency. The present invention has been made in view of the above circumstances, and its objective is to provide a technology that can improve hydrocarbon gas production efficiency.

[0006] To solve the above problems, the present invention provides a production system comprising: a production unit that generates hydrocarbon gas by catalytic reaction based on hydrogen gas and carbon oxide gas and delivers a delivery gas containing the hydrogen gas, carbon oxide gas and hydrocarbon gas; a first supply unit that supplies a first raw material gas containing the hydrogen gas and carbon oxide gas to the production unit; a first acquisition unit that acquires the amount of hydrogen gas and the amount of carbon oxide gas contained in the first raw material gas; a second supply unit that separates the hydrogen gas and carbon oxide gas from the delivery gas and supplies a second raw material gas containing the separated hydrogen gas and carbon oxide gas to the production unit; a second acquisition unit that acquires the amount of hydrogen gas and the amount of carbon oxide gas contained in the second raw material gas; and a control unit that controls the amount of hydrogen gas and the amount of carbon oxide gas contained in the first raw material gas based on the amount of hydrogen gas and the amount of carbon oxide gas contained in the second raw material gas.

[0007] In the above generation system, a first raw material gas containing hydrogen gas and carbon oxide gas is supplied to the generation unit, and hydrocarbon gas is generated by a catalytic reaction based on the hydrogen gas and carbon oxide gas. A discharge gas containing hydrogen gas, carbon oxide gas, and hydrocarbon gas is discharged from the generation unit. Hydrogen gas and carbon oxide gas are separated from the discharge gas, and a second raw material gas containing the separated hydrogen gas and carbon oxide gas is supplied to the generation unit. By controlling the amount of hydrogen gas and carbon oxide gas contained in the first raw material gas based on the amount of hydrogen gas and carbon oxide gas contained in the second raw material gas, the generation efficiency of hydrocarbon gas can be improved. In addition, by separating hydrogen gas and carbon oxide gas from the discharge gas and supplying a second raw material gas containing the separated hydrogen gas and carbon oxide gas to the generation unit, exhaust of carbon oxide gas can be suppressed.

[0008] The carbon oxide gas contained in the first raw material gas is carbon dioxide gas, and the carbon oxide gas contained in the second raw material gas is carbon monoxide gas and carbon dioxide gas. By controlling the amounts of hydrogen gas and carbon dioxide gas contained in the first raw material gas based on the amounts of hydrogen gas, carbon monoxide gas, and carbon dioxide gas contained in the second raw material gas, the hydrocarbon gas production efficiency can be improved.

[0009] The carbon oxide gas contained in the first raw material gas is carbon monoxide gas and carbon dioxide gas, and the carbon oxide gas contained in the second raw material gas is carbon monoxide gas and carbon dioxide gas. By controlling the amounts of hydrogen gas, carbon monoxide gas, and carbon dioxide gas contained in the first raw material gas based on the amounts of hydrogen gas, carbon monoxide gas, and carbon dioxide gas contained in the second raw material gas, the hydrocarbon gas production efficiency can be improved.

[0010] The production unit comprises at least one first reactor and at least one second reactor. The first reactor generates a saturated hydrocarbon gas having 1 or more carbon atoms based on the hydrogen gas and the carbon oxide gas. The hydrogen gas, the carbon oxide gas, and the saturated hydrocarbon gas having 1 or more carbon atoms generated by the first reactor flow into the second reactor. The second reactor generates a saturated hydrocarbon gas having 1 to 4 carbon atoms based on the hydrogen gas and the saturated hydrocarbon gas having 5 or more carbon atoms. The second reactor then discharges the discharged gas containing the hydrogen gas, the carbon oxide gas, and the saturated hydrocarbon gas having 1 to 4 carbon atoms. This allows for the selective generation of saturated hydrocarbon gas having 1 to 4 carbon atoms and improves the efficiency of generating saturated hydrocarbon gas having 1 to 4 carbon atoms.

[0011] The discharged gas from the second reactor includes hydrogen gas, carbon oxide gas, saturated hydrocarbon gas having 1 to 4 carbon atoms, and saturated hydrocarbon gas having 5 or more carbon atoms. The production system comprises a condensation unit that condenses the saturated hydrocarbon gas having 5 or more carbon atoms produced by the first reactor and the saturated hydrocarbon gas having 5 or more carbon atoms contained in the discharged gas from the second reactor into a liquid saturated hydrocarbon having 5 or more carbon atoms and stores it in a storage unit, and a third supply unit that vaporizes the liquid saturated hydrocarbon having 5 or more carbon atoms stored in the storage unit and supplies the vaporized saturated hydrocarbon gas having 5 or more carbon atoms to the second reactor. By vaporizing the liquid saturated hydrocarbon having 5 or more carbon atoms stored in the storage unit and supplying the vaporized saturated hydrocarbon gas having 5 or more carbon atoms to the second reactor, saturated hydrocarbon gas having 1 to 4 carbon atoms can be selectively produced, and the production efficiency of saturated hydrocarbon gas having 1 to 4 carbon atoms can be improved.

[0012] The third supply unit supplies the vaporized saturated hydrocarbon gas having 5 or more carbon atoms, along with at least a portion of the hydrogen gas and carbon oxide gas discharged from the first reactor, to the second reactor. This allows the vaporized saturated hydrocarbon gas having 5 or more carbon atoms to be supplied to the second reactor using at least a portion of the hydrogen gas and carbon oxide gas discharged from the first reactor.

[0013] The third supply unit supplies the vaporized saturated hydrocarbon gas having 5 or more carbon atoms and a portion of the second raw material gas together to the second reactor. This makes it possible to supply the vaporized saturated hydrocarbon gas having 5 or more carbon atoms to the second reactor using a portion of the second raw material gas.

[0014] Furthermore, the present invention relates to a production method in a production system comprising a production unit that produces hydrocarbon gas by catalytic reaction based on hydrogen gas and carbon oxide gas, and delivers a delivery gas containing the hydrogen gas, carbon oxide gas, and hydrocarbon gas, comprising: a first supply step of supplying a first raw material gas containing the hydrogen gas and carbon oxide gas to the production unit; a first acquisition step of obtaining the amount of hydrogen gas and the amount of carbon oxide gas contained in the first raw material gas; a second supply step of separating the hydrogen gas and carbon oxide gas from the delivery gas and supplying a second raw material gas containing the separated hydrogen gas and carbon oxide gas to the production unit; a second acquisition step of obtaining the amount of hydrogen gas and the amount of carbon oxide gas contained in the second raw material gas; and a control step of controlling the amount of hydrogen gas and the amount of carbon oxide gas contained in the first raw material gas based on the amount of hydrogen gas and the amount of carbon oxide gas contained in the second raw material gas.

[0015] According to the present invention, it is possible to improve the efficiency of hydrocarbon gas production.

[0016] Figure 1 is a schematic diagram of the generation system according to the embodiment. Figure 2 is a configuration diagram of the generation system according to the embodiment. Figure 3 is a configuration diagram of the generation system according to the embodiment. Figure 4 is a diagram showing a part of the configuration of the generation system according to the embodiment. Figure 5 is a diagram showing a part of the configuration of the generation system according to the embodiment.

[0017] The embodiments of the present invention will be described below. The embodiments shown below are examples of embodiments of the present invention and do not limit the technical scope of the present invention to the following embodiments.

[0018] Figure 1 is a schematic diagram of the production system (production apparatus) 1 according to the embodiment. The production system 1 shown in Figure 1 generates hydrocarbon gas (gaseous hydrocarbons) and water (gas) by catalytic reaction based on hydrogen gas and carbon oxide gas. The reaction equation for the production of hydrocarbon gas and water is as follows: nCO ２ + (3n+1)H ２ = C ｎ H （２ｎ＋２） +2nH ２O...(1) CO ２ +H ２ = CO + H ２ O...(2) nCO+(2n+1)H ２ = C ｎ H （２ｎ＋２） +nH ２ O... (3)

[0019] The catalyst can be any catalyst that promotes reaction equations (1) to (3), and for example, it comprises a stabilized zirconia support in which a stabilizing element is solid-dissolved and having a tetragonal and / or cubic crystal structure, and Ni supported on the stabilized zirconia support. The stabilizing element may be at least one transition element selected from the group consisting of Mn, Fe, and Co. For example, oxygen-vacant ZrO ２ A catalyst on which an active species is supported may also be used. On the catalyst, CO ２ It actively interacts with the oxygen vacancy that becomes the base site. At this time, CO ２ This adsorption form is easily reactive, and the reaction in reaction equation (2) proceeds more easily. The CO produced in the reaction in reaction equation (2) is an intermediate product, and CO is adsorbed on the surface of Fe, for example. When CO is adsorbed on the surface of Fe, electrons from the lone pair of electrons of CO are donated to the empty orbital of Fe, forming a σ bond. Subsequently, electrons are back-donated from the d orbital of Fe to the 2π of CO, forming a π bond. When a π bond is formed, the bond between Fe and C is strengthened, while the bond between C and O is weakened, and CO becomes more susceptible to attack by H atoms, etc., and is more easily hydrocarbonized. At this time, if the basicity of the Fe surface is strengthened by alkali metals, etc., the back-donation is strengthened, and at the same time, H atoms are added to the Fe surface. ２ The adsorption and dissociation of hydrogen is weakened. As a result, hydrogenation of CO becomes less likely, and reaction equation (3), in which a chain of carbon atoms grows, is more likely to occur than the hydrogenation reaction to methane.

[0020] In a reaction, for example, CO ２ and H ２ If the ratio deviates from the stoichiometric ratio in reaction equations (1) and (3), the reactions in reaction equations (4) and (5) below are highly likely to occur. nCO ２ +3nH ２ = C ｎH ２ｎ +2nH ２ O...(4) nCO+2nH ２ = C ｎ H ２ｎ +nH ２ O ... (5) This allows unsaturated hydrocarbons, such as propylene (C ３ H ６ ), butene (C ４ H ８ ), ethylene (C ２ H ４ Olefins such as ) are included in the synthesized product. In order to obtain a large amount of alkanes, which are saturated hydrocarbons, it is preferable to carry out the reaction on a stoichiometric ratio basis as shown in reaction formula (1) and reaction formula (3).

[0021] The generation system 1 comprises a generation unit 11, a first supply unit 12, a first acquisition unit 13, a second supply unit 14, a second acquisition unit 15, and a control unit 16. The generation unit 11 generates hydrocarbon gas and water (water vapor) by catalytic reaction based on hydrogen gas (gaseous hydrogen) and carbon oxide gas (gaseous carbon oxide). The generation unit 11 also delivers a gas (delivery gas) containing hydrogen gas, carbon oxide gas, and hydrocarbon gas, as well as water.

[0022] The first supply unit 12 supplies a first raw material gas containing hydrogen gas and carbon oxide gas to the generation unit 11. The carbon oxide gas contained in the first raw material gas may be carbon dioxide gas. The carbon oxide gas contained in the first raw material gas may be carbon monoxide gas and carbon dioxide gas. The first supply unit 12 may supply hydrogen gas to the generation unit 11 from a hydrogen gas tank in which hydrogen gas is stored. The first supply unit 12 may supply hydrogen gas generated by a water electrolysis device or the like to the generation unit 11. The first supply unit 12 may supply carbon oxide gas to the generation unit 11 from a carbon oxide gas tank in which carbon oxide gas is stored. The first supply unit 12 may supply carbon dioxide gas to the generation unit 11 from a carbon dioxide gas tank in which carbon dioxide gas is stored. The first supply unit 12 may supply a mixed gas such as biogas or gasification gas containing hydrogen gas and carbon oxide gas to the generation unit 11 as the first raw material gas.

[0023] The first acquisition unit 13 acquires the amount of hydrogen gas and the amount of carbon oxide gas contained in the first raw material gas. The first acquisition unit 13 may also acquire the flow rate of hydrogen gas and the flow rate of carbon oxide gas contained in the first raw material gas. The second supply unit 14 separates hydrogen gas and carbon oxide gas from the discharged gas and supplies the second raw material gas containing the separated hydrogen gas and carbon oxide gas to the generation unit 11. The second acquisition unit 15 acquires the amount of hydrogen gas and the amount of carbon oxide gas contained in the second raw material gas. The second acquisition unit 15 may also acquire the flow rate of hydrogen gas and the flow rate of carbon oxide gas contained in the second raw material gas.

[0024] The control unit 16 is a controller that controls the overall operation of the generation system 1. The control unit 16 may be configured using dedicated equipment or a general-purpose computer. The control unit 16 is equipped with hardware resources such as a processor (CPU), memory, storage, and a communication interface. The memory may be RAM. The storage may be a non-volatile storage device (e.g., ROM, flash memory). The functions of the control unit 16 are realized by loading programs stored in storage into memory and executing them with the processor. However, the configuration of the control unit 16 is not limited to these. For example, all or part of the functions may be configured using circuits such as ASICs or FPGAs, or all or part of the functions may be executed on a cloud server or other device.

[0025] When the generation system 1 is started, the first raw material gas is supplied from the first supply unit 12 to the generation unit 11. When the generation system 1 is started, the control unit 16 controls the amount of hydrogen gas and carbon oxide gas contained in the first raw material gas based on the set flow rate and set molar ratio. The control unit 16 may also control the amount of hydrogen gas and carbon oxide gas contained in the first raw material gas by controlling the flow rate of the first raw material gas. The set flow rate is the flow rate of the first raw material gas supplied to the generation unit 11. The set molar ratio is the molar ratio (H) of hydrogen gas and carbon oxide gas supplied to the generation unit 11. ２ / (CO + CO ２ ))

[0026] Once the production system 1 is started and the reaction in the production unit 11 progresses, the second raw material gas is supplied to the production unit 11 from the second supply unit 14. When the second raw material gas is supplied to the production unit 11, CO2 is produced in the production unit 11. ２ and H ２ The ratio deviates from the stoichiometric ratio in reaction equation (1) and reaction equation (3). The control unit 16 controls the amount of hydrogen gas and carbon oxide gas contained in the first raw material gas based on the amount of hydrogen gas and carbon oxide gas contained in the second raw material gas. As a result, CO in the generation unit 11 ２ and H ２ This prevents the ratio from deviating from the stoichiometric ratio in reaction equation (1) and reaction equation (3).

[0027] In the generation system 1, a first raw material gas containing hydrogen gas and carbon oxide gas is supplied to the generation unit 11, and hydrocarbon gas is generated by a catalytic reaction based on the hydrogen gas and carbon oxide gas. A discharge gas containing hydrogen gas, carbon oxide gas, and hydrocarbon gas is discharged from the generation unit 11. Hydrogen gas and carbon oxide gas are separated from the discharge gas, and a second raw material gas containing the separated hydrogen gas and carbon oxide gas is supplied to the generation unit 11. By controlling the amount of hydrogen gas and carbon oxide gas contained in the first raw material gas based on the amount of hydrogen gas and carbon oxide gas contained in the second raw material gas, the generation efficiency of hydrocarbon gas can be improved. In addition, by separating hydrogen gas and carbon oxide gas from the discharge gas and supplying the second raw material gas containing the separated hydrogen gas and carbon oxide gas to the generation unit 11, the exhaust of carbon oxide gas can be suppressed.

[0028] Figure 2 is a diagram of the configuration of a production system 1 according to an embodiment. The production system 1 comprises a first-stage reactor 21, a second-stage reactor 22, and a third-stage reactor 23. Reactors 21, 22, and 23 are pre-filled with catalyst. In the production system 1 shown in Figure 2, the production unit 11 has a configuration having reactors 21, 22, and 23, but is not limited to this configuration. Reactor 22 may be omitted, and the production unit 11 may have a configuration having reactor 21 and reactor 23. The production unit 11 may have a configuration having reactors 21, 22, and a plurality of reactors 23. The production unit 11 may have a configuration having reactors 21, 22, and 23, and other reactors.

[0029] The generation system 1 comprises a first-stage self-heat exchanger (economizer) 31 and a second-stage self-heat exchanger (economizer) 32. The generation system 1 comprises a first-stage heat exchanger 41, a second-stage heat exchanger 42 and a third-stage heat exchanger 43. The generation system 1 comprises a first-stage drain trap (gas-liquid separator) 51, a second-stage drain trap (gas-liquid separator) 52 and a third-stage drain trap (gas-liquid separator) 53, a storage tank 54, a pump 55 and a vaporizer 56. The generation system 1 comprises a separator 61, a compressor 62 and a buffer tank 63.

[0030] The first supply unit 12 and the self-heat exchanger 31 are connected by piping. The reactor 21 and the self-heat exchanger 31 are connected by piping. The self-heat exchanger 31 and the heat exchanger 41 are connected by piping. The self-heat exchanger 32 and the heat exchanger 41 are connected by piping. The reactor 22 and the self-heat exchanger 32 are connected by piping. The self-heat exchanger 32 and the heat exchanger 42 are connected by piping.

[0031] The first raw material gas is supplied to the reactor 21 through the self-heat exchanger 31. The reactor 21 generates saturated hydrocarbon gas with 1 or more carbon atoms and water (water vapor) through a catalytic reaction based on hydrogen gas and carbon oxide gas. In the reactor 21, mainly CO ２ The carbon monoxide is converted to CO, and the converted CO and CO contained in the raw material gas are converted into saturated hydrocarbon gas with one or more carbon atoms. The hydrocarbon gas and water produced in reactor 21 flow into reactor 22 through self-heat exchanger 31, heat exchanger 41 and self-heat exchanger 32. Unreacted first raw material gas in reactor 21 flows into reactor 22 through self-heat exchanger 31, heat exchanger 41 and self-heat exchanger 32. In addition, carbon monoxide gas produced in reactor 21 and unreacted carbon monoxide gas in reactor 21 flow into reactor 22 through self-heat exchanger 31, heat exchanger 41 and self-heat exchanger 32. Heat exchange takes place in self-heat exchanger 31 between the first raw material gas supplied to reactor 21 and the gas discharged from reactor 21.

[0032] Reactor 22 generates saturated hydrocarbon gas with one or more carbon atoms and water (steam) through a catalytic reaction based on hydrogen gas and carbon oxide gas. In reactor 22, CO2 is mainly converted to CO, and the converted CO, CO contained in the raw material gas, and CO generated in reactor 21 are converted into saturated hydrocarbon gas with one or more carbon atoms. The hydrocarbon gas, water, and unreacted first raw material gas generated in reactors 21 and 22 flow into reactor 23 through the self-heat exchanger 32 and heat exchanger 42. In addition, carbon monoxide gas generated in reactor 22 and unreacted carbon monoxide gas in reactor 22 flow into reactor 23 through the self-heat exchanger 32 and heat exchanger 42.

[0033] In the self-heat exchanger 32, heat exchange takes place between the gas sent from reactor 21 and the gas sent from reactor 22. Hydrogen gas, carbon oxide gas, and saturated hydrocarbon gas with 1 or more carbon atoms generated by reactors 21 and 22 flow into reactor 23. Reactor 23 generates hydrocarbon gas and water (steam) through a catalytic reaction based on the hydrogen gas and carbon oxide gas. Reactor 23 also generates saturated hydrocarbon gas with 1 to 4 carbon atoms based on the hydrogen gas and saturated hydrocarbon gas with 5 or more carbon atoms. In reactor 23, saturated hydrocarbon gas with 5 or more carbon atoms reacts with hydrogen, decomposing the saturated hydrocarbon gas with 5 or more carbon atoms and increasing the amount of saturated hydrocarbon gas with 1 to 4 carbon atoms. In this way, saturated hydrocarbon gas with 1 to 4 carbon atoms can be selectively generated, and the generation efficiency of saturated hydrocarbon gas with 1 to 4 carbon atoms can be improved. In reactor 23, when saturated hydrocarbon gas with 5 or more carbon atoms is decomposed, the increase in saturated hydrocarbon gas with 3 to 4 carbon atoms is large, while the increase in saturated hydrocarbon gas with 1 to 2 carbon atoms is small.

[0034] The chemical reaction between a saturated hydrocarbon with 8 carbon atoms and hydrogen can be represented by the following equation: C ８ H １８ +H ２ = 2C ４ H １０ ... (6) C ８ H １８ +H ２ = C ３ H ８ +C５ H １２ ... (7) C ８ H １８ +H ２ =CH ４ +C ７ H １６ ... (8) A reaction occurs in which one of the carbon chains in a saturated hydrocarbon with 8 carbon atoms is decomposed by hydrogen, producing a different saturated hydrocarbon. To induce such a reaction, it is preferable to use a material that has a metal with hydrogen dissociation adsorption capacity and a blended acid. Furthermore, the reaction is more likely to occur at higher temperatures and pressures.

[0035] Reactor 23 discharges a discharge gas containing unreacted hydrogen gas, unreacted carbon oxide gas, and saturated hydrocarbon gas having 1 to 4 carbon atoms. Reactor 23 also discharges water produced within the reactor. If saturated hydrocarbons with 5 or more carbon atoms remain undecomposed in reactor 23, reactor 23 discharges a discharge gas containing unreacted hydrogen gas, unreacted carbon oxide gas, saturated hydrocarbon gas having 1 to 4 carbon atoms, and saturated hydrocarbon gas having 5 or more carbon atoms. Thus, the discharge gas discharged from reactor 23 may contain hydrogen gas, carbon oxide gas, saturated hydrocarbon gas having 1 to 4 carbon atoms, and saturated hydrocarbon gas having 5 or more carbon atoms. Reactor 23 and separator 61 are connected by piping. The discharge gas discharged from reactor 23 flows into separator 61 after passing through heat exchanger 43.

[0036] The heat exchanger 41 condenses the water (gas) produced by the reactor 21. The heat exchanger 41 is an example of a condensation section. The heat exchanger 41 and the drain trap 51 are connected by piping. The drain trap 51 and the storage tank 54 are connected by piping. The drain trap 51 separates water (liquid) from the gas discharged from the reactor 21. The water separated from the gas discharged from the reactor 21 is stored in the storage tank 54. The storage tank 54 is an example of a storage section.

[0037] The boiling point of saturated hydrocarbons with 1 to 4 carbon atoms is -0.5 degrees Celsius or lower, while the boiling point of saturated hydrocarbons with 5 or more carbon atoms is 36 degrees Celsius or higher. Therefore, in the heat exchanger 41, the water produced by the reactor 21 is condensed, and the saturated hydrocarbon gas with 5 or more carbon atoms produced by the reactor 21 is condensed into liquid saturated hydrocarbons with 5 or more carbon atoms. The storage tank 54 stores both water and liquid saturated hydrocarbons with 5 or more carbon atoms. Water is stored at the bottom of the storage tank 54, and liquid saturated hydrocarbons with 5 or more carbon atoms are stored at the bottom of the storage tank 54.

[0038] The heat exchanger 42 condenses the water (gas) produced by the reactor 22. The heat exchanger 42 is an example of a condensation section. The heat exchanger 42 and the drain trap 52 are connected by piping. The drain trap 52 and the storage tank 54 are connected by piping. The drain trap 52 separates water (liquid) from the gas discharged from the reactor 22.

[0039] Water separated from the gas discharged from reactor 22 is stored in storage tank 54. In heat exchanger 42, the water produced by reactor 22 is condensed, and saturated hydrocarbon gases with 5 or more carbon atoms contained in the discharged gas from reactor 22 are condensed into liquid saturated hydrocarbons with 5 or more carbon atoms. Water and liquid saturated hydrocarbons with 5 or more carbon atoms are stored in storage tank 54.

[0040] The heat exchanger 43 condenses the water (gas) produced by the reactor 23. The heat exchanger 43 is an example of a condensation section. The heat exchanger 43 and the drain trap 53 are connected by piping. The drain trap 53 and the storage tank 54 are connected by piping. The drain trap 53 separates water (liquid) from the gas discharged from the reactor 23. The water separated from the gas discharged from the reactor 23 is stored in the storage tank 54.

[0041] In the heat exchanger 43, the water discharged from the reactor 23 is condensed, and the saturated hydrocarbon gas containing 5 or more carbon atoms in the discharged gas from the reactor 23 is condensed into liquid saturated hydrocarbons containing 5 or more carbon atoms. The storage tank 54 stores both water and liquid saturated hydrocarbons containing 5 or more carbon atoms.

[0042] The generation system 1 includes a chiller 64. The chiller 64 cools the cooling water (refrigerant) used to condense water in the heat exchangers 41, 42, and 43. The heat exchangers 41, 42, 43 and the chiller 64 are interconnected by piping through which the cooling water flows. The cooling water cooled by the chiller 64 returns to the chiller 64 via the heat exchangers 41, 42, and 43.

[0043] A storage tank 54 and a pump 55 are connected by piping. A pump 55 and a vaporizer 56 are connected by piping. Liquid saturated hydrocarbons with 5 or more carbon atoms stored in the storage tank 54 are sent to the vaporizer 56 by the pump 55. A reactor 23 and a vaporizer 56 are connected by piping. The liquid saturated hydrocarbons with 5 or more carbon atoms are vaporized by the vaporizer 56, and the saturated hydrocarbon gas with 5 or more carbon atoms is sent to the reactor 23. The water stored in the storage tank 54 is discharged to the outside. The water stored in the storage tank 54 may be stored in, for example, a by-product water tank. A surge tank may be provided between the pump 55 and the vaporizer 56, and liquid saturated hydrocarbons with 5 or more carbon atoms may be temporarily stored in the surge tank.

[0044] The separator 61 separates hydrogen gas and carbon oxide gas contained in the discharged gas from saturated hydrocarbon gas with 1 to 4 carbon atoms contained in the discharged gas. As a separation method, at least one of the following may be used: a membrane separation method using a separation membrane, a PSA (Pressure Swing Adsorption) method, and a TSA (Thermal Swing Adsorption) method. The separator 61 and the compressor 62 are connected by piping. The compressor 62 and the buffer tank 63 are connected by piping. The self-heat exchanger 31 and the buffer tank 63 are connected by piping. The vaporizer 56 and the buffer tank 63 are connected by piping.

[0045] The saturated hydrocarbon gas having 1 to 4 carbon atoms separated by the separator 61 is sent to the outside. The saturated hydrocarbon gas having 1 to 4 carbon atoms may be stored in a gas tank, for example. The saturated hydrocarbon gas having 1 to 4 carbon atoms may be further separated into saturated hydrocarbon gas having 1 to 2 carbon atoms and saturated hydrocarbon gas having 3 to 4 carbon atoms. The hydrogen gas and carbon oxide gas separated by the separator 61 are sent to the buffer tank 63 by the compressor 62 and stored in the buffer tank 63. The hydrogen gas and carbon oxide gas stored in the buffer tank 63 are pressurized by the compressor 62 and sent to the vaporizer 56.

[0046] Pressurized hydrogen gas and carbon oxide gas are used to send saturated hydrocarbon gas with 5 or more carbon atoms from the vaporizer 56 to the reactor 23. The vaporizer 56 vaporizes the liquid saturated hydrocarbon gas with 5 or more carbon atoms stored in the storage tank 54 and supplies the vaporized liquid saturated hydrocarbon gas with 5 or more carbon atoms to the reactor 23. This allows for the selective production of saturated hydrocarbon gas with 1 to 4 carbon atoms and improves the production efficiency of saturated hydrocarbon gas with 1 to 4 carbon atoms. The vaporizer 56 also supplies the vaporized saturated hydrocarbon gas with 5 or more carbon atoms and a portion of the second raw material gas together to the reactor 23. In this way, the vaporized saturated hydrocarbon gas with 5 or more carbon atoms can be supplied to the reactor 23 using a portion of the second raw material gas. The vaporizer 56 is an example of a third supply unit.

[0047] The above describes an example of a process in which hydrogen gas and carbon oxide gas stored in the buffer tank 63 are pressurized by the compressor 62 and sent to the vaporizer 56, but the system is not limited to this example. Figure 3 is a configuration diagram of the production system 1 according to the embodiment. As shown in Figure 3, the heat exchanger 42 and the vaporizer 56 may be connected by piping. Alternatively, the piping connecting the vaporizer 56 and the buffer tank 63 may be omitted. In the configuration shown in Figure 3, the hydrocarbon gas, water, and unreacted first raw material gas produced in reactors 21 and 22 flow into the vaporizer 56 through the self-heat exchanger 32 and the heat exchanger 42. The hydrocarbon gas, water, and first raw material gas that flow into the vaporizer 56 send saturated hydrocarbon gas with 5 or more carbon atoms from the vaporizer 56 to the reactor 23. In this way, the vaporizer 56 supplies the vaporized saturated hydrocarbon gas having 5 or more carbon atoms, along with at least a portion of the hydrogen gas and carbon oxide gas sent from reactors 21 and 22, to reactor 23. At least a portion of the hydrogen gas and carbon oxide gas sent from reactors 21 and 22 can be used to supply the vaporized saturated hydrocarbon gas having 5 or more carbon atoms to reactor 23.

[0048] A shut-off valve may be provided in the piping connecting the heat exchanger 42 and the vaporizer 56, and a shut-off valve may also be provided in the piping connecting the vaporizer 56 and the buffer tank 63. Alternatively, the shut-off valve in the piping connecting the heat exchanger 42 and the vaporizer 56 may be opened, and the shut-off valve in the piping connecting the vaporizer 56 and the buffer tank 63 may be closed. In this case, the hydrocarbon gas, water, and unreacted first raw material gas produced by reactors 21 and 22 flow into the vaporizer 56 through the self-heat exchanger 32 and the heat exchanger 42, but the hydrogen gas and carbon oxide gas stored in the buffer tank 63 do not flow into the vaporizer 56.

[0049] The valve connecting the vaporizer 56 and the buffer tank 63 may be opened, and the valve connecting the heat exchanger 42 and the vaporizer 56 may be closed. In this case, hydrogen gas and carbon oxide gas stored in the buffer tank 63 will flow into the vaporizer 56, but hydrocarbon gas, water, and unreacted first raw material gas produced by reactors 21 and 22 will not flow into the vaporizer 56.

[0050] The valve connecting the heat exchanger 42 and the vaporizer 56 may be closed, and the valve connecting the vaporizer 56 and the buffer tank 63 may be opened. In this case, hydrogen gas and carbon oxide gas stored in the buffer tank 63 flow into the vaporizer 56, and hydrocarbon gas, water, and unreacted first raw material gas produced in reactors 21 and 22 also flow into the vaporizer 56.

[0051] Although not shown in Figures 2 and 3, a heat transfer medium is passed through reactors 21, 22, and 23, and the heat transfer medium is heated by a heater or the like, thereby raising the temperature inside reactors 21, 22, and 23 to a temperature suitable for the generation of hydrocarbon gas.

[0052] Referring to Figure 4, an example of a process for controlling the amount of hydrogen gas and carbon dioxide gas contained in the first raw material gas will be explained. Figure 4 is a diagram showing a part of the configuration of the production system 1 according to the embodiment. The first raw material gas, which contains hydrogen gas and carbon dioxide gas, is supplied from the first supply unit 12 to the reactor 21 of the production unit 11.

[0053] The first data acquisition unit 13 includes a flow meter 81 installed in a pipe 71 through which hydrogen gas flows, and a flow meter 82 installed in a pipe 72 through which carbon dioxide gas flows. The flow meter 81 measures the flow rate of hydrogen gas flowing through pipe 71. The flow meter 82 measures the flow rate of carbon dioxide gas flowing through pipe 72. The first data acquisition unit 13 sends the measured values ​​from the flow meter 81 and the flow meter 82 to the control unit 16.

[0054] The second acquisition unit 15 includes a flow meter 85 installed in the pipe 73 through which the second raw material gas flows, and an analyzer 86 installed in the pipe 73. The flow meter 85 measures the flow rate of the second raw material gas flowing through the pipe 73. The analyzer 86 analyzes the second raw material gas flowing through the pipe 73 and measures the concentration (%) of hydrogen gas and the concentration (%) of carbon oxide gas (carbon monoxide and carbon dioxide) contained in the second raw material gas. The second acquisition unit 15 sends the measured values ​​measured by the flow meter 85 and the measured values ​​measured by the analyzer 86 to the control unit 16. The second supply unit 14 includes a flow control unit 87. The flow control unit 87 controls the flow rate of the second raw material gas supplied to the reactor 21 by controlling the opening degree of a flow control valve 88 installed in the pipe 73.

[0055] <Start of Operation> The processes at the start of operation of the generation system 1 will be described below. The control unit 16 determines the initial flow rate of hydrogen gas (FR1) and the initial flow rate of carbon dioxide gas (FR2) based on the initial flow rate (Ftru1) and the initial molar ratio (X). The initial flow rate (Ftru1) is a set value set at the start of operation and is the flow rate of the first raw material gas supplied to the reactor 21. The initial molar ratio (X) is a set value set at the start of operation and is the molar ratio (H) of hydrogen gas and carbon dioxide gas supplied to the reactor 21. ２ / (CO + CO ２ The initial flow rate (Ftru1) and initial molar ratio (X) are stored in the memory of the control unit 16.

[0056] The control unit 16 calculates the initial flow rate of hydrogen gas (FR1) and the initial flow rate of carbon dioxide gas (FR2) based on the following equations (7) and (8): FR1 = X / (X + 1) × Ftru1 ... (7) FR2 = 1 / (X + 1) × Ftru1 ... (8)

[0057] The first supply unit 12 controls the flow rate of hydrogen gas supplied to the reactor 21 by controlling the opening degree of the flow control valve 83 provided in the piping 71 based on control instructions from the control unit 16. The first supply unit 12 controls the flow rate of hydrogen gas supplied to the reactor 21 so that the flow rate of hydrogen gas flowing through the piping 71 maintains the initial setting flow rate (FR1). The first supply unit 12 may also control the flow rate of hydrogen gas supplied to the reactor 21 so that the flow rate of hydrogen gas flowing through the piping 71 maintains the allowable range of the initial setting flow rate (FR1).

[0058] The first supply unit 12 controls the flow rate of carbon dioxide gas supplied to the reactor 21 by controlling the opening degree of the flow control valve 84 provided in the piping 72 based on control instructions from the control unit 16. The first supply unit 12 controls the flow rate of carbon dioxide gas supplied to the reactor 21 so that the flow rate of carbon dioxide gas flowing through the piping 72 maintains the initial setting flow rate (FR2). The first supply unit 12 may also control the flow rate of carbon dioxide gas supplied to the reactor 21 so that the flow rate of carbon dioxide gas flowing through the piping 72 maintains the allowable range of the initial setting flow rate (FR2).

[0059] <During steady-state operation> The processes during steady-state operation of the generation system 1 will be explained below. Steady-state operation of the generation system 1 is an operating state in which hydrocarbon gas is stably generated in the generation unit 11.

[0060] When the pressure in the buffer tank 63 exceeds a certain pressure (for example, the operating pressure), or when a certain amount of the second raw material gas has accumulated in the buffer tank 63, the flow rate control unit 87 starts supplying the second raw material gas to the reactor 21. The flow rate control unit 87 controls the flow rate of the second raw material gas flowing through the piping 73 so that the flow rate of the second raw material gas flowing through the piping 73 is maintained at a predetermined flow rate (Fret). The flow rate control unit 87 may also control the flow rate of the second raw material gas flowing through the piping 73 so that the flow rate of the second raw material gas flowing through the piping 73 is maintained within an acceptable range of the predetermined flow rate (Fret).

[0061] The control unit 16 calculates the set flow rate (FR3) and set flow rate (FR4) based on the following equations (9) and (10): FR3 = X / (X + 1) × Ftru1 - h１ ×Fret...(9) FR4=1 / (X+1)×Ftru1-a １ ×Fret ... (10) h in equation (9) １ This is the concentration (%) of hydrogen gas contained in the second raw material gas. a in Equation (10) １ This represents the concentration (%) of carbon oxide gas (carbon monoxide and carbon dioxide) contained in the second raw material gas.

[0062] The first supply unit 12 controls the flow rate of hydrogen gas supplied to the reactor 21 by controlling the opening degree of the flow control valve 83 provided in the piping 71 based on control instructions from the control unit 16. The first supply unit 12 controls the flow rate of hydrogen gas supplied to the reactor 21 so that the flow rate of hydrogen gas flowing through the piping 71 maintains a set flow rate (FR3). The first supply unit 12 may also control the flow rate of hydrogen gas supplied to the reactor 21 so that the flow rate of hydrogen gas flowing through the piping 71 maintains an allowable range of the set flow rate (FR3).

[0063] The first supply unit 12 controls the flow rate of carbon dioxide gas supplied to the reactor 21 by controlling the opening degree of the flow control valve 84 provided in the piping 72 based on control instructions from the control unit 16. The first supply unit 12 controls the flow rate of carbon dioxide gas supplied to the reactor 21 so that the flow rate of carbon dioxide gas flowing through the piping 72 maintains a set flow rate (FR4). The first supply unit 12 may also control the flow rate of carbon dioxide gas supplied to the reactor 21 so that the flow rate of carbon dioxide gas flowing through the piping 72 maintains an allowable range of the set flow rate (FR4).

[0064] A flow meter 89 may be installed in the piping 74. The flow meter 89 measures the flow rate of the raw material gas supplied to the reactor 21. If there is a large discrepancy between the measured value measured by the flow meter 89 and the initial setting flow rate (Ftru1), the control unit 16 may recalculate the set flow rate (FR3) and set flow rate (FR4).

[0065] An analyzer 90 may be installed in the piping 74. The analyzer 90 analyzes the raw material gas supplied to the reactor 21 and measures the concentration (%) of hydrogen gas and the concentration (%) of carbon oxide gas contained in the raw material gas. Based on the concentration (%) of hydrogen gas and the concentration (%) of carbon oxide gas contained in the raw material gas, the analyzer 90 calculates the molar ratio (H) of hydrogen gas and carbon oxide gas supplied to the reactor 21. ２ / (CO + CO ２ The control unit 16 measures the set flow rate (FR3) and set flow rate (FR4) if there is a large discrepancy between the measured value measured by the analyzer 90 and the initial setting molar ratio (X).

[0066] Referring to Figure 5, an example of a process for controlling the amount of hydrogen gas and carbon oxide gas contained in the first raw material gas will be explained. Figure 5 is a diagram showing a part of the configuration of the production system 1 according to the embodiment. The first raw material gas, which contains hydrogen gas and carbon oxide gas, is supplied from the first supply unit 12 to the reactor 21 of the production unit 11.

[0067] The first supply unit 12 has an analyzer 91. The analyzer 91 analyzes the mixed gas and measures the concentration (%) of hydrogen gas and the concentration (%) of carbon oxide gas (carbon monoxide gas and carbon dioxide gas) contained in the mixed gas. The first supply unit 12 sends the measured values ​​measured by the analyzer 91 to the control unit 16.

[0068] The first data acquisition unit 13 includes a flow meter 81 installed in a pipe 71 through which hydrogen gas flows, and a flow meter 82 installed in a pipe 72 through which carbon dioxide gas flows. The flow meter 81 measures the flow rate of hydrogen gas flowing through pipe 71. The flow meter 82 measures the flow rate of a mixed gas flowing through pipe 72. The mixed gas is a biogas or gasification gas containing hydrogen gas and carbon dioxide gas. The first data acquisition unit 13 sends the measured values ​​from the flow meter 81 and the flow meter 82 to the control unit 16.

[0069] The second acquisition unit 15 includes a flow meter 85 provided in a pipe 73 through which a second raw material gas flows, and an analyzer 86 provided in the pipe 73. The flow meter 85 measures the flow rate of the second raw material gas flowing through the pipe 73. The analyzer 86 analyzes the second raw material gas flowing through the pipe 73 and measures the concentration (%) of hydrogen gas contained in the second raw material gas and the concentration (%) of carbon oxide gas (carbon monoxide gas and carbon dioxide gas) contained in the second raw material gas. The second acquisition unit 15 sends the measured values measured by the flow meter 85 and the measured values measured by the analyzer 86 to the control unit 16. The second supply unit 14 includes a flow control unit 87. The flow control unit 87 controls the flow rate of the second raw material gas supplied to the reactor 21 by controlling the opening degree of a flow control valve 88 provided in the pipe 73.

[0070] <At the start of operation> Each process at the start of operation of the production system 1 will be described. Based on the measured value measured by the analyzer 91, the control unit 16 calculates the molar ratio (X ０ ). The molar ratio (X ０ ) of the mixed gas is the molar ratio (H ２ / (CO + CO ２ )) of hydrogen gas and carbon oxide gas contained in the mixed gas. The control unit 16 compares the initial set molar ratio (X) with the molar ratio (X ０ ) of the mixed gas. The initial set molar ratio (X) is stored in the memory of the control unit 16. When the initial set molar ratio (X) is greater than the molar ratio (X ０ ) of the mixed gas, hydrogen gas and the mixed gas are supplied to the reactor 21. When the initial set molar ratio (X) is less than or equal to the molar ratio (X ０ ) of the mixed gas, the mixed gas is supplied to the reactor 21.

[0071] The process of supplying hydrogen gas and the mixed gas to the reactor 21 will be described. The control unit 16 determines the initial set flow rate (FR5) of hydrogen gas based on the following formula (11). FR5 = Fmix × a ０ ×(X - X ０ )...(11) In the formula (11), Fmix is the flow rate of the mixed gas. In the formula (11), a ０ is the concentration (%) of carbon oxide gas (carbon monoxide gas and carbon dioxide gas) contained in the mixed gas.

[0072] The control unit 16 determines the initial flow rate (Ftru2) based on the following equation (12): Ftru2 = Fmix + FR5 = Fmix × (1 + a ０ × (X-X) ０ )) ... (12)

[0073] The first supply unit 12 controls the flow rate of hydrogen gas supplied to the reactor 21 by controlling the opening degree of the flow control valve 83 provided in the piping 71 based on control instructions from the control unit 16. The first supply unit 12 controls the flow rate of hydrogen gas supplied to the reactor 21 so that the flow rate of hydrogen gas flowing through the piping 71 maintains the initial setting flow rate (FR5). The first supply unit 12 may also control the flow rate of hydrogen gas supplied to the reactor 21 so that the flow rate of hydrogen gas flowing through the piping 71 maintains the allowable range of the initial setting flow rate (FR5).

[0074] The flow rate of the mixed gas supplied to the reactor 21 may be left to chance. In this case, the first supply unit 12 does not control the flow rate of the mixed gas supplied to the reactor 21. The first supply unit 12 may control the flow rate of the mixed gas supplied to the reactor 21 to a predetermined amount. In this case, Fmix in equation (11) is the flow rate of the mixed gas after control.

[0075] The process of supplying only the mixed gas to the reactor 21 will now be described. If the flow rate of the mixed gas supplied to the reactor 21 is left to chance, the first supply unit 12 does not control the flow rate of the mixed gas supplied to the reactor 21. The first supply unit 12 may control the flow rate of the mixed gas supplied to the reactor 21 to a predetermined amount.

[0076] <During steady-state operation> The processes during steady-state operation of the generation system 1 will be explained below. Steady-state operation of the generation system 1 is an operating state in which hydrocarbon gas is stably generated in the generation unit 11.

[0077] When the pressure in the buffer tank 63 exceeds a certain pressure (for example, the operating pressure), or when a certain amount of the second raw material gas has accumulated in the buffer tank 63, the flow rate control unit 87 starts supplying the second raw material gas to the production unit 11 (reactor 21). The flow rate control unit 87 controls the flow rate of the second raw material gas flowing through the piping 73 so that the flow rate of the second raw material gas flowing through the piping 73 is maintained at a predetermined flow rate (Fret). The flow rate control unit 87 may also control the flow rate of the second raw material gas flowing through the piping 73 so that the flow rate of the second raw material gas flowing through the piping 73 is maintained within the allowable range of the predetermined flow rate (Fret).

[0078] The control unit 16 calculates the flow rate of carbon oxide gas (Frc) flowing through the pipe 73 based on a predetermined flow rate (Fret), the concentration (%) of hydrogen gas contained in the second raw material gas flowing through the pipe 73, and the concentration (%) of carbon oxide gas contained in the second raw material gas flowing through the pipe 73. The control unit 16 determines the target flow rate (Ftrc) of carbon oxide gas supplied to the generation unit 11 (reactor 21) after the start of supply of the second raw material gas based on the following formula (13): Ftrc = Ftru² × (1 / (X + 1)) ... (13)

[0079] Here, the difference between Ftrc and Frc is defined as the flow rate of carbon oxide gas contained in the mixed gas. The control unit 16 determines the set flow rate (Fmix1) of the mixed gas after the start of supply of the second raw material gas based on the following equation (14). Fmix1 = (Ftrc - Frc) × (1 + X ０ ) ... (14)

[0080] The control unit 16 calculates the flow rate of hydrogen gas (Frh) flowing through the pipe 73 based on a predetermined flow rate (Fret), the concentration (%) of hydrogen gas contained in the second raw material gas flowing through the pipe 73, and the concentration (%) of carbon oxide gas contained in the second raw material gas flowing through the pipe 73. The control unit 16 determines the target flow rate (Ftrh) of hydrogen gas supplied to the reactor 21 after the start of supply of the second raw material gas based on the following equation (15): Ftrh = Ftru² × (X / (X + 1)) ... (15)

[0081] The control unit 16 determines the set flow rate of hydrogen gas (Fhad1) after the start of supply of the second raw material gas based on the following equation (16): Fhad1 = (Ftrh - Frh - Fmix × a ０ ×X ０ ) ... (16)

[0082] The first supply unit 12 controls the flow rate of hydrogen gas supplied to the reactor 21 by controlling the opening degree of the flow control valve 83 provided in the piping 71 based on control instructions from the control unit 16. The first supply unit 12 controls the flow rate of hydrogen gas supplied to the reactor 21 so that the flow rate of hydrogen gas flowing through the piping 71 maintains a set flow rate (Fhad1). The first supply unit 12 may also control the flow rate of hydrogen gas supplied to the reactor 21 so that the flow rate of hydrogen gas flowing through the piping 71 maintains an allowable range of the set flow rate (Fhad1).

[0083] The first supply unit 12 controls the flow rate of the mixed gas supplied to the reactor 21 by controlling the opening degree of the flow control valve 84 provided in the piping 72 based on control instructions from the control unit 16. The first supply unit 12 controls the flow rate of the mixed gas supplied to the reactor 21 so that the flow rate of the mixed gas flowing through the piping 72 maintains a set flow rate (Fmix 1). The first supply unit 12 may also control the flow rate of the mixed gas supplied to the reactor 21 so that the flow rate of the mixed gas flowing through the piping 72 maintains an allowable range of the set flow rate (Fmix 1).

[0084] A flow meter 89 may be installed in the piping 74. The flow meter 89 measures the flow rate of the raw material gas supplied to the reactor 21. If there is a large discrepancy between the measured value measured by the flow meter 89 and the initial setting flow rate (Ftru2), the control unit 16 may recalculate the set flow rate (Fhad1) and the set flow rate (Fmix1).

[0085] An analyzer 90 may be installed in the piping 74. The analyzer 90 analyzes the raw material gas supplied to the reactor 21 and measures the concentration (%) of hydrogen gas and the concentration (%) of carbon oxide gas contained in the raw material gas. Based on the concentration (%) of hydrogen gas and the concentration (%) of carbon oxide gas contained in the raw material gas, the analyzer 90 calculates the molar ratio (H) of hydrogen gas and carbon oxide gas supplied to the reactor 21. ２ / (CO + CO２ Measure ()). When the deviation between the measured value measured by the analysis meter 90 and the initial set molar ratio (X) is large, the control unit 16 may recalculate the set flow rate (Fhad1) and the set flow rate (Fmix1).

[0086] The present invention can also be regarded as a production method in which a production system or a production device executes at least a part of the above processing (the above steps). Each of the above configurations and processes can be combined with each other to constitute the present invention as long as no technical contradiction occurs.

[0087] 1... Production system; 11... Production unit; 12... First supply unit; 13... First acquisition unit; 14... Second supply unit; 15... Second acquisition unit; 16... Control unit; 21, 22, 23... Reactors; 31, 32... Self-heat exchangers; 41, 42, 43... Heat exchangers; 51, 52, 53... Drain traps; 54... Storage tank; 55... Pump; 56... Vaporizer; 61... Separator; 62... Compressor; 63... Buffer tank; 64... Chiller; 71, 72, 73, 74... Pipes; 81, 82, 85, 89... Flow meters; 83, 84, 88... Flow control valves; 86, 90, 91... Analysis meters; 87... Flow control unit

Claims

1. A generation system comprising: a generation unit that generates hydrocarbon gas by catalytic reaction based on hydrogen gas and carbon oxide gas and delivers a delivery gas containing the hydrogen gas, carbon oxide gas and hydrocarbon gas; a first supply unit that supplies a first raw material gas containing the hydrogen gas and carbon oxide gas to the generation unit; a first acquisition unit that acquires the amount of hydrogen gas and the amount of carbon oxide gas contained in the first raw material gas; a second supply unit that separates the hydrogen gas and carbon oxide gas from the delivery gas and supplies a second raw material gas containing the separated hydrogen gas and carbon oxide gas to the generation unit; a second acquisition unit that acquires the amount of hydrogen gas and the amount of carbon oxide gas contained in the second raw material gas; and a control unit that controls the amount of hydrogen gas and the amount of carbon oxide gas contained in the first raw material gas based on the amount of hydrogen gas and the amount of carbon oxide gas contained in the second raw material gas.

2. The production system according to claim 1, wherein the carbon oxide gas contained in the first raw material gas is carbon dioxide gas, and the carbon oxide gas contained in the second raw material gas is carbon monoxide gas and carbon dioxide gas.

3. The production system according to claim 1, wherein the carbon oxide gas contained in the first raw material gas is carbon monoxide gas and carbon dioxide gas, and the carbon oxide gas contained in the second raw material gas is carbon monoxide gas and carbon dioxide gas.

4. The production unit comprises at least one first reactor and at least one second reactor, the first reactor produces a saturated hydrocarbon gas having 1 or more carbon atoms based on the hydrogen gas and the carbon oxide gas, the hydrogen gas, the carbon oxide gas and the saturated hydrocarbon gas having 1 or more carbon atoms produced by the first reactor flow into the second reactor, the second reactor produces a saturated hydrocarbon gas having 1 to 4 carbon atoms based on the hydrogen gas and the saturated hydrocarbon gas having 5 or more carbon atoms, and delivers the discharged gas containing the hydrogen gas, the carbon oxide gas and the saturated hydrocarbon gas having 1 to 4 carbon atoms, the production system according to any one of claims 1 to 3.

5. The production system according to claim 4, wherein the discharged gas discharged from the second reactor includes the hydrogen gas, the carbon oxide gas, the saturated hydrocarbon gas having 1 to 4 carbon atoms, and the saturated hydrocarbon gas having 5 or more carbon atoms, and comprises: a condensation unit that condenses the saturated hydrocarbon gas having 5 or more carbon atoms produced by the first reactor and the saturated hydrocarbon gas having 5 or more carbon atoms contained in the discharged gas discharged from the second reactor into a liquid saturated hydrocarbon having 5 or more carbon atoms and stores it in a storage unit; and a third supply unit that vaporizes the liquid saturated hydrocarbon having 5 or more carbon atoms stored in the storage unit and supplies the vaporized saturated hydrocarbon gas having 5 or more carbon atoms to the second reactor.

6. The production system according to claim 5, wherein the third supply unit supplies together the vaporized saturated hydrocarbon gas having 5 or more carbon atoms and at least a portion of the hydrogen gas and carbon oxide gas discharged from the first reactor to the second reactor.

7. The production system according to claim 5, wherein the third supply unit supplies the vaporized saturated hydrocarbon gas having 5 or more carbon atoms and a portion of the second raw material gas together to the second reactor.

8. A method for generating a gas in a generating system comprising a generating unit that generates a hydrocarbon gas by catalytic reaction based on hydrogen gas and carbon oxide gas, and sends out a discharged gas containing the hydrogen gas, carbon oxide gas and hydrocarbon gas, comprising: a first supply step of supplying a first raw material gas containing the hydrogen gas and carbon oxide gas to the generating unit; a first acquisition step of obtaining the amount of hydrogen gas and the amount of carbon oxide gas contained in the first raw material gas; a second supply step of separating the hydrogen gas and carbon oxide gas from the discharged gas and supplying a second raw material gas containing the separated hydrogen gas and carbon oxide gas to the generating unit; a second acquisition step of obtaining the amount of hydrogen gas and the amount of carbon oxide gas contained in the second raw material gas; and a control step of controlling the amount of hydrogen gas and the amount of carbon oxide gas contained in the first raw material gas based on the amount of hydrogen gas and the amount of carbon oxide gas contained in the second raw material gas.

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