Hydrogen and methanol co-production system and method

Abstract

The invention relates to the field of green energy, and discloses a hydrogen production and methanol co-production system and method.The hydrogen production and methanol co-production system comprises a water electrolysis hydrogen production unit, a carbon source supply unit, a hydrogen buffer storage unit, a methanol synthesis reaction unit, a gas separation and circulation unit and an intelligent regulation and control unit; the carbon source supply unit is used for providing CO2 or carbon-containing gas, the hydrogen buffer storage unit is connected with the output end of the water electrolysis hydrogen production unit and used for storing and adjusting hydrogen supply, and the input end of the methanol synthesis reaction unit is connected with the hydrogen buffer storage unit and the carbon source supply unit and used for catalytic hydrogenation reaction to generate methanol. Through cooperation of the water electrolysis hydrogen production unit and the hydrogen buffer storage unit, the problem of hydrogen production instability caused by renewable energy electric power fluctuation is effectively solved, continuous and stable hydrogen supply is achieved, and the raw material requirement of downstream methanol synthesis reaction is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of green energy, and in particular to a system and method for producing hydrogen and co-producing methanol. Background Art

[0002] Hydrogen is a clean energy carrier that is widely used in chemical industry, fuel cells, oil refining and other fields. Traditional hydrogen production methods mainly include fossil fuel reforming (such as natural gas steam reforming) and water electrolysis to produce hydrogen, but these processes often have high energy consumption or carbon emission problems. In the process of hydrogen production, carbon-containing by-products (such as CO, CO2) are usually produced or additional carbon sources are required. In order to improve resource utilization, hydrogen production can be combined with methanol synthesis to form a co-production system. For example, when hydrogen is produced by partial oxidation of natural gas or autothermal reforming, the generated synthesis gas (H2, CO, CO2) can be directly used as a raw material for methanol synthesis to produce methanol under the action of a catalyst. This co-production method can not only improve the economic efficiency of the hydrogen energy system, but also realize the recycling of carbon resources and reduce overall emissions.

[0003] Traditional water electrolysis hydrogen production technology directly relies on intermittent renewable energy. Its output is affected by factors such as weather and day and night, resulting in frequent fluctuations in the operating load of the electrolyzer and a decrease in hydrogen production efficiency. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a hydrogen production and methanol co-production system and method, which solves the problem of reliance on intermittent renewable energy, whose output is affected by factors such as weather and day and night, resulting in frequent fluctuations in the operating load of the electrolyzer and a decrease in hydrogen production efficiency.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a hydrogen production and methanol co-production system, comprising: a water electrolysis hydrogen production unit, a carbon source supply unit, a hydrogen buffer storage unit, a methanol synthesis reaction unit, a gas separation circulation unit, and an intelligent control unit, wherein the water electrolysis hydrogen production unit is used to utilize renewable energy electricity to electrolyze water to produce hydrogen, the carbon source supply unit is used to provide CO2 or carbon-containing gas, the hydrogen buffer storage unit is connected to the output end of the water electrolysis hydrogen production unit, and is used to store and adjust the hydrogen supply, the methanol synthesis reaction unit, the input end of which is respectively connected to the hydrogen buffer storage unit and the carbon source supply unit, and is used to catalyze hydrogenation reaction to generate methanol, the gas separation circulation unit is connected to the output end of the methanol synthesis reaction unit, and is used to separate unreacted gas and circulate it to the reaction unit, and the intelligent control unit is respectively connected to the water electrolysis hydrogen production unit, the hydrogen buffer storage unit, and the methanol synthesis reaction unit, and is used to dynamically adjust the system operating parameters.

[0006] Preferably, the water electrolysis hydrogen production unit adopts a proton exchange membrane electrolyzer or an alkaline electrolyzer, the input end of which is connected to a renewable energy power generation device, and the output end of which is connected to the hydrogen buffer storage unit.

[0007] Preferably, the carbon source supply unit includes an industrial CO2 capture device or a biomass gasification device, and the output end is connected to the air inlet of the methanol synthesis reaction unit.

[0008] Preferably, the hydrogen buffer storage unit adopts solid hydrogen storage material or high-pressure hydrogen storage tank, the input end is connected to the water electrolysis hydrogen production unit, and the output end is connected to the methanol synthesis reaction unit.

[0009] Preferably, the methanol synthesis reaction unit includes a Cu-based catalyst reactor, the gas inlet is connected to a hydrogen buffer storage unit and a carbon source supply unit, and the gas outlet is connected to a gas separation circulation unit.

[0010] Preferably, the gas separation circulation unit adopts a membrane separation device or a pressure swing adsorption device, the input end of which is connected to the methanol synthesis reaction unit, and the output end of which is respectively connected to the waste gas discharge port and the circulating gas inlet.

[0011] Preferably, the intelligent control unit includes a wind and solar power generation prediction module and a reaction parameter optimization module, the data input end is connected to the renewable energy power generation monitoring device, and the control output end is respectively connected to the water electrolysis hydrogen production unit, the hydrogen buffer storage unit and the methanol synthesis reaction unit.

[0012] Preferably, a method for producing hydrogen and co-producing methanol comprises the following steps:

[0013] S1. Hydrogen production by water electrolysis: Using renewable energy to drive the water electrolysis hydrogen production unit, hydrogen is produced by electrolyzing water in a proton exchange membrane electrolyzer or an alkaline electrolyzer;

[0014] S2. Carbon source supply: CO2 or carbon-containing gas is provided through a carbon source supply unit, wherein the carbon source comes from an industrial CO2 capture device or a biomass gasification device;

[0015] S3. Hydrogen buffer storage: The hydrogen generated by the water electrolysis hydrogen production unit is transported to a hydrogen buffer storage unit for storage and pressure regulation. The hydrogen buffer storage unit uses solid hydrogen storage materials or high-pressure hydrogen storage tanks;

[0016] S4, methanol synthesis reaction: hydrogen from the hydrogen buffer storage unit and CO2 / carbon-containing gas from the carbon source supply unit are transported to the methanol synthesis reaction unit, and hydrogenation reaction is carried out under the action of Cu-based catalyst to generate methanol;

[0017] S5, gas separation cycle: The unreacted gas output from the methanol synthesis reaction unit is transported to the gas separation cycle unit, where it is separated into recyclable H2 and CO2 through a membrane separation device or a pressure swing adsorption device and returned to the methanol synthesis reaction unit, while the remaining waste gas is discharged;

[0018] S6. Intelligent Control: Real-time monitoring of system operation status through the intelligent control unit, including:

[0019] The wind and solar power generation prediction module predicts the amount of electricity generated by renewable energy;

[0020] The reaction parameter optimization module dynamically adjusts the power of the water electrolysis hydrogen production unit, the hydrogen storage capacity of the hydrogen buffer storage unit, and the temperature and pressure parameters of the methanol synthesis reaction unit.

[0021] Preferably, in S1, the water electrolysis hydrogen production unit increases the electrolysis power when the renewable energy power is sufficient according to the instruction of the intelligent control unit, and reduces the electrolysis power or suspends operation when the power is insufficient.

[0022] Preferably, in S5, the gas separation and circulation unit controls the H2 purity of the separated recyclable gas to ≥99.5%, the CO2 purity to ≥99%, and adjusts the ratio of the circulating gas volume to the fresh raw gas in real time.

[0023] The present invention provides a system and method for producing hydrogen and methanol. It has the following beneficial effects:

[0024] 1. The present invention effectively solves the problem of hydrogen production instability caused by renewable energy power fluctuations through the coordinated cooperation of the water electrolysis hydrogen production unit and the hydrogen buffer storage unit, realizes the continuous and stable supply of hydrogen, and ensures the raw material demand of the downstream methanol synthesis reaction.

[0025] 2. The present invention improves the utilization efficiency of carbon resources such as CO2 through the coordinated work of the carbon source supply unit and the gas separation and circulation unit, solves the problem of low carbon conversion rate in traditional processes, and realizes the cyclic and efficient utilization of carbon resources.

[0026] 3. The present invention ensures accurate control of system operating parameters through real-time monitoring and dynamic adjustment of each functional unit by the intelligent control unit, greatly improving the operating stability and production efficiency of the entire co-production system.

[0027] 4. The present invention adopts high-efficiency devices such as proton exchange membrane electrolyzer and Cu-based catalyst reactor, combined with optimized process parameter control, to achieve the co-production of hydrogen and methanol, with comprehensive advantages such as green and low carbon, low energy consumption, and high product purity. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the system framework of a hydrogen production and methanol co-production system of the present invention;

[0029] Figure 2 The present invention is a method flow diagram of a method for producing hydrogen and co-producing methanol. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Please see the attached Figure 1 An embodiment of the present invention provides a hydrogen production and methanol co-production system, including: a water electrolysis hydrogen production unit, a carbon source supply unit, a hydrogen buffer storage unit, a methanol synthesis reaction unit, a gas separation circulation unit, and an intelligent control unit. The water electrolysis hydrogen production unit is used to use renewable energy electricity to electrolyze water to produce hydrogen. The carbon source supply unit is used to provide CO2 or carbon-containing gas. The hydrogen buffer storage unit is connected to the output end of the water electrolysis hydrogen production unit and is used to store and adjust the hydrogen supply. The methanol synthesis reaction unit has an input end respectively connected to the hydrogen buffer storage unit and the carbon source supply unit for catalytic hydrogenation reaction to generate methanol. The gas separation circulation unit is connected to the output end of the methanol synthesis reaction unit for separating unreacted gas and circulating it to the reaction unit. The intelligent control unit is respectively connected to the water electrolysis hydrogen production unit, the hydrogen buffer storage unit, and the methanol synthesis reaction unit for dynamically adjusting the system operating parameters.

[0032] Specifically, the water electrolysis hydrogen production unit is used to produce hydrogen by electrolyzing water using renewable energy electricity, the carbon source supply unit is used to provide CO2 or carbon-containing gas, the hydrogen buffer storage unit is used to store and adjust the hydrogen supply, the methanol synthesis reaction unit is used to catalyze hydrogenation to produce methanol, the gas separation circulation unit is used to separate unreacted gas and circulate it to the reaction unit, and the intelligent control unit is used to dynamically adjust the system operating parameters, which fully demonstrates the work flow of the system. First, the water electrolysis hydrogen production unit produces hydrogen and transports it to the hydrogen buffer storage unit for storage and adjustment. At the same time, the carbon source supply unit provides the CO2 or carbon-containing gas required for the reaction. Then, hydrogen and carbon source enter the methanol synthesis reaction unit together for catalytic reaction to produce methanol. After the reaction, the gas is separated and recycled by the gas separation circulation unit to achieve the separation and recycling of unreacted gas. During the whole process, the intelligent control unit dynamically adjusts the operating parameters of each unit. Through the coordinated work of each unit, efficient conversion of renewable energy electricity, recycling of carbon resources and co-production of hydrogen and methanol are achieved.

[0033] The water electrolysis hydrogen production unit uses a proton exchange membrane electrolyzer or an alkaline electrolyzer, the input end of which is connected to a renewable energy power generation device, and the output end is connected to a hydrogen buffer storage unit.

[0034] Specifically, by adopting a proton exchange membrane electrolyzer or an alkaline electrolyzer, the input end is connected to a renewable energy power generation device and the output end is connected to a hydrogen buffer storage unit. The proton exchange membrane electrolyzer or the alkaline electrolyzer serves as the core equipment to realize the function of efficient electrolysis of water to produce hydrogen. The input end is connected to the renewable energy power generation device to ensure the use of clean energy for power supply, and the output end is connected to the hydrogen buffer storage unit to realize stable transportation and buffer storage of hydrogen, thereby ensuring the cleanliness and environmental protection of the hydrogen production process.

[0035] The carbon source supply unit includes an industrial CO2 capture device or a biomass gasification device, and the output end is connected to the air inlet of the methanol synthesis reaction unit.

[0036] Specifically, the industrial CO2 capture device or biomass gasification device serves as the core equipment to realize the carbon source supply function, and the output end is connected to the air inlet of the methanol synthesis reaction unit to ensure the stable delivery of CO2 or carbon-containing gas, which not only ensures the stability and diversity of the carbon source supply, but also realizes the effective connection with the methanol synthesis reaction unit.

[0037] The hydrogen buffer storage unit uses solid-state hydrogen storage materials or high-pressure hydrogen storage tanks, with the input end connected to the water electrolysis hydrogen production unit and the output end connected to the methanol synthesis reaction unit.

[0038] Specifically, solid-state hydrogen storage materials or high-pressure hydrogen storage tanks realize the hydrogen buffer storage function, the input end is connected to the water electrolysis hydrogen production unit to ensure stable reception of hydrogen, and the output end is connected to the methanol synthesis reaction unit to realize on-demand supply of hydrogen, which not only ensures the safety and reliability of hydrogen storage, but also realizes effective connection with the water electrolysis hydrogen production unit and the methanol synthesis reaction unit.

[0039] The methanol synthesis reaction unit includes a Cu-based catalyst reactor, an air inlet of which is respectively connected to a hydrogen buffer storage unit and a carbon source supply unit, and an air outlet is connected to a gas separation and circulation unit.

[0040] Specifically, the Cu-based catalyst reactor realizes the function of efficient catalytic hydrogenation reaction. The air inlet is connected to the hydrogen buffer storage unit and the carbon source supply unit to ensure the stable supply of reaction raw materials, and the air outlet is connected to the gas separation circulation unit to realize the effective separation of reaction products. This not only ensures the high efficiency of the methanol synthesis reaction, but also realizes the effective connection with the hydrogen buffer storage unit, the carbon source supply unit and the gas separation circulation unit.

[0041] The gas separation circulation unit adopts a membrane separation device or a pressure swing adsorption device, the input end of which is connected to the methanol synthesis reaction unit, and the output end of which is respectively connected to the waste gas discharge port and the circulating gas inlet.

[0042] Specifically, the membrane separation device or the pressure swing adsorption device realizes the gas separation function, the input end is connected to the methanol synthesis reaction unit to ensure the effective reception of the reaction products, and the output end is respectively connected to the waste gas discharge port and the circulating gas inlet to realize the efficient separation and recycling of the unreacted gas, which not only ensures the accuracy of gas separation, but also realizes the effective connection with the methanol synthesis reaction unit.

[0043] The intelligent control unit includes a wind and solar power generation prediction module and a reaction parameter optimization module. The data input end is connected to the renewable energy power generation monitoring device, and the control output end is respectively connected to the water electrolysis hydrogen production unit, the hydrogen buffer storage unit and the methanol synthesis reaction unit.

[0044] Specifically, the wind and solar power generation prediction module and the reaction parameter optimization module realize the intelligent control function of the system. The data input end is connected to the renewable energy power generation monitoring device to ensure real-time acquisition of power generation data. The control output end is respectively connected to the water electrolysis hydrogen production unit, the hydrogen buffer storage unit and the methanol synthesis reaction unit to realize precise adjustment of the operating parameters of each unit, ensuring the intelligent level of system operation.

[0045] Please see the attached Figure 2 A method for producing hydrogen and co-producing methanol comprises the following steps:

[0046] S1. Hydrogen production by water electrolysis: Using renewable energy to drive the water electrolysis hydrogen production unit, hydrogen is produced by electrolyzing water in a proton exchange membrane electrolyzer or an alkaline electrolyzer;

[0047] S2. Carbon source supply: CO2 or carbon-containing gas is provided through a carbon source supply unit, wherein the carbon source comes from an industrial CO2 capture device or a biomass gasification device;

[0048] S3. Hydrogen buffer storage: The hydrogen generated by the water electrolysis hydrogen production unit is transported to the hydrogen buffer storage unit for storage and pressure regulation. The hydrogen buffer storage unit uses solid hydrogen storage materials or high-pressure hydrogen storage tanks;

[0049] S4, methanol synthesis reaction: hydrogen from the hydrogen buffer storage unit and CO2 / carbon-containing gas from the carbon source supply unit are transported to the methanol synthesis reaction unit, and hydrogenation reaction is carried out under the action of Cu-based catalyst to generate methanol;

[0050] S5, gas separation cycle: The unreacted gas output from the methanol synthesis reaction unit is transported to the gas separation cycle unit, where it is separated into recyclable H2 and CO2 through a membrane separation device or a pressure swing adsorption device and returned to the methanol synthesis reaction unit, while the remaining waste gas is discharged;

[0051] S6. Intelligent Control: Real-time monitoring of system operation status through the intelligent control unit, including:

[0052] The wind and solar power generation prediction module predicts the amount of electricity generated by renewable energy;

[0053] The reaction parameter optimization module dynamically adjusts the power of the water electrolysis hydrogen production unit, the hydrogen storage capacity of the hydrogen buffer storage unit, and the temperature and pressure parameters of the methanol synthesis reaction unit.

[0054] Specifically, in step S1, a proton exchange membrane electrolyzer or an alkaline electrolyzer is used to electrolyze water to produce hydrogen, thereby achieving efficient conversion of renewable energy electricity;

[0055] In step S2, an industrial CO2 capture device or a biomass gasification device is used to provide CO2 or carbon-containing gas to achieve a diversified supply of carbon resources;

[0056] In step S3, solid-state hydrogen storage materials or high-pressure hydrogen storage tanks are used to store hydrogen and regulate pressure to solve the imbalance between hydrogen supply and demand;

[0057] In step S4, a hydrogenation reaction is carried out under the action of a Cu-based catalyst to produce methanol, achieving efficient catalytic conversion;

[0058] In step S5, a membrane separation device or a pressure swing adsorption device is used to separate unreacted gas to improve the utilization rate of raw materials;

[0059] In step S6, the wind and solar power generation prediction module and the reaction parameter optimization module are used to dynamically adjust the system operating parameters to ensure stable system operation;

[0060] Through the above steps, the problems of raw material supply, reaction control and product separation in the process of renewable energy hydrogen production and methanol synthesis are solved, and a green, low-carbon, efficient and stable hydrogen-methanol co-production effect is achieved.

[0061] In S1, the water electrolysis hydrogen production unit increases the electrolysis power when there is sufficient renewable energy power according to the instructions of the intelligent control unit, and reduces the electrolysis power or suspends operation when there is insufficient power.

[0062] Specifically, when renewable energy power is sufficient, the electrolysis power is increased to maximize hydrogen production efficiency, and when power is insufficient, the electrolysis power is reduced or the operation is suspended to ensure system safety and stability. This not only achieves efficient utilization of renewable energy power, but also ensures dynamic matching between the hydrogen production process and power supply.

[0063] In S5, the gas separation and circulation unit controls the H2 purity of the separated recyclable gas to ≥99.5% and the CO2 purity to ≥99%, and adjusts the ratio of the recycle gas volume to the fresh raw gas in real time.

[0064] Specifically, the quality of the circulating gas is ensured by controlling the purity indicators of H2 and CO2, and the raw material ratio is optimized by dynamically adjusting the ratio of the circulating gas volume to the fresh raw material gas, which not only ensures the reaction activity of the circulating gas but also maximizes the raw material utilization efficiency.

[0065] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A hydrogen production and methanol co-production system, characterized in that: include: A water electrolysis hydrogen production unit, a carbon source supply unit, a hydrogen buffer storage unit, a methanol synthesis reaction unit, a gas separation circulation unit, and an intelligent control unit. The water electrolysis hydrogen production unit is used to produce hydrogen by electrolyzing water using renewable energy electricity. The carbon source supply unit is used to provide CO2 or carbon-containing gas. The hydrogen buffer storage unit is connected to the output end of the water electrolysis hydrogen production unit and is used to store and adjust the hydrogen supply. The methanol synthesis reaction unit has an input end respectively connected to the hydrogen buffer storage unit and the carbon source supply unit and is used to catalyze hydrogenation reaction to generate methanol. The gas separation circulation unit is connected to the output end of the methanol synthesis reaction unit and is used to separate unreacted gas and circulate it to the reaction unit. The intelligent control unit is respectively connected to the water electrolysis hydrogen production unit, the hydrogen buffer storage unit, and the methanol synthesis reaction unit and is used to dynamically adjust the system operating parameters.

2. A hydrogen production and methanol co-production system according to claim 1, characterized in that: The water electrolysis hydrogen production unit adopts a proton exchange membrane electrolyzer or an alkaline electrolyzer, the input end of which is connected to a renewable energy power generation device, and the output end of which is connected to the hydrogen buffer storage unit.

3. A hydrogen production and methanol co-production system according to claim 1, characterized in that: The carbon source supply unit includes an industrial CO2 capture device or a biomass gasification device, and the output end is connected to the air inlet of the methanol synthesis reaction unit.

4. A hydrogen production and methanol co-production system according to claim 1, characterized in that: The hydrogen buffer storage unit adopts solid hydrogen storage material or high-pressure hydrogen storage tank, the input end of which is connected to the water electrolysis hydrogen production unit, and the output end of which is connected to the methanol synthesis reaction unit.

5. The hydrogen production and methanol co-production system according to claim 1, characterized in that: The methanol synthesis reaction unit includes a Cu-based catalyst reactor, an air inlet of which is respectively connected to a hydrogen buffer storage unit and a carbon source supply unit, and an air outlet of which is connected to a gas separation and circulation unit.

6. The hydrogen production and methanol co-production system according to claim 1, characterized in that: The gas separation circulation unit adopts a membrane separation device or a pressure swing adsorption device, the input end of which is connected to the methanol synthesis reaction unit, and the output end of which is respectively connected to the waste gas discharge port and the circulating gas inlet.

7. The hydrogen production and methanol co-production system according to claim 1, characterized in that: The intelligent control unit includes a wind and solar power generation prediction module and a reaction parameter optimization module. The data input end is connected to the renewable energy power generation monitoring device, and the control output end is respectively connected to the water electrolysis hydrogen production unit, the hydrogen buffer storage unit and the methanol synthesis reaction unit.

8. A method for producing hydrogen and co-producing methanol, used in a hydrogen production and co-producing methanol system according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: S1. Hydrogen production by water electrolysis: Using renewable energy to drive the water electrolysis hydrogen production unit, hydrogen is produced by electrolyzing water in a proton exchange membrane electrolyzer or an alkaline electrolyzer; S2. Carbon source supply: CO2 or carbon-containing gas is provided through a carbon source supply unit, wherein the carbon source comes from an industrial CO2 capture device or a biomass gasification device; S3. Hydrogen buffer storage: The hydrogen generated by the water electrolysis hydrogen production unit is transported to a hydrogen buffer storage unit for storage and pressure regulation. The hydrogen buffer storage unit uses solid hydrogen storage materials or high-pressure hydrogen storage tanks; S4, methanol synthesis reaction: hydrogen from the hydrogen buffer storage unit and CO2 / carbon-containing gas from the carbon source supply unit are transported to the methanol synthesis reaction unit, and hydrogenation reaction is carried out under the action of Cu-based catalyst to generate methanol; S5, gas separation cycle: The unreacted gas output from the methanol synthesis reaction unit is transported to the gas separation cycle unit, where it is separated into recyclable H2 and CO2 through a membrane separation device or a pressure swing adsorption device and returned to the methanol synthesis reaction unit, while the remaining waste gas is discharged; S6. Intelligent Control: Real-time monitoring of system operation status through the intelligent control unit, including: The wind and solar power generation prediction module predicts the amount of electricity generated by renewable energy; The reaction parameter optimization module dynamically adjusts the power of the water electrolysis hydrogen production unit, the hydrogen storage capacity of the hydrogen buffer storage unit, and the temperature and pressure parameters of the methanol synthesis reaction unit.

9. The method for producing hydrogen and co-producing methanol according to claim 1, characterized in that: In S1, the water electrolysis hydrogen production unit increases the electrolysis power when the renewable energy power is sufficient according to the instruction of the intelligent control unit, and reduces the electrolysis power or suspends operation when the power is insufficient.

10. The method for producing hydrogen and co-producing methanol according to claim 1, characterized in that: In S5, the gas separation and circulation unit controls the H2 purity of the separated recyclable gas to ≥99.5% and the CO2 purity to ≥99%, and adjusts the ratio of the recycle gas volume to the fresh feed gas in real time.

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