A zero-carbon emission energy conversion process and system

Abstract

This invention discloses a zero-carbon emission energy conversion process and system. The system consists of a renewable energy power generation module, a water electrolysis module, a methanol synthesis module, and a semi-closed carbon dioxide power generation system using methanol as fuel, installed at a mobile energy consumption terminal. The renewable energy power generation module generates electricity and produces hydrogen and oxygen through the water electrolysis module. The hydrogen, combined with carbon dioxide from the mobile energy consumption terminal, enters the methanol synthesis module to synthesize green methanol, which is then stored. When the mobile energy consumption terminal needs replenishment, the stored high-pressure, high-purity carbon dioxide is unloaded to the production terminal. The green methanol stored at the production terminal and the oxygen produced by the water electrolysis module are then supplied to the mobile energy consumption terminal. Methanol and oxygen are burned in the semi-closed carbon dioxide power generation system to generate electricity. The high-purity, high-pressure carbon dioxide produced by combustion is stored in batches and used to resynthesize methanol, forming a zero-carbon closed loop. This invention couples a semi-closed CO2 power generation process with a renewable energy methanol production process, eliminating the need for additional carbon capture devices, fully utilizing the byproduct oxygen, and achieving an energy conversion efficiency exceeding 60%, thus realizing a reliable, high-power-density, and low-cost net-zero emission energy conversion.

Description

Technical Field

[0001] This application relates to the field of energy and power technology, and in particular to a zero-carbon emission energy conversion process and system. Background Technology

[0002] Carbon peaking and carbon neutrality are important goals for global environmental protection and climate change response. How to reduce and fix carbon will be the core goal of the energy industry for a considerable period of time. At the same time, relevant industry organizations at home and abroad have also put forward industry carbon emission reduction targets. For example, the International Maritime Organization has put forward requirements for ship energy efficiency, carbon emission intensity and other indicators, and proposed the goal of achieving net-zero greenhouse gas emissions in the shipping industry by 2050. In order to meet the carbon emission target requirements of the shipping industry and society, the current means are mainly: (1) improving the efficiency of the power system through power technology progress or waste heat recovery. However, there is not much room for further improvement of the efficiency of traditional power such as diesel engines, and net-zero emission targets cannot be achieved by improving efficiency; (2) using green fuels such as green methanol and ammonia. However, the traditional green fuel preparation process requires carbon capture or collection of biomass, which is costly and the output is prone to fluctuation; (3) installing carbon deposition devices on the power system. However, large-scale carbon deposition devices have high energy consumption and large volume and weight, occupy too much ship space and affect ship efficiency. Summary of the Invention

[0003] The purpose of this invention is to address the current predicament of the shipping and other industries lacking reliable, high-power-density, low-cost net-zero emission technologies.

[0004] This invention provides a zero-carbon emission energy conversion system, comprising: Renewable energy generation module 1, used to generate electrical energy; The water electrolysis module 2 is electrically connected to the renewable energy power generation module 1 and is used to electrolyze water using the electrical energy to produce hydrogen and oxygen. The methanol synthesis module 6 is used to receive hydrogen produced by the water electrolysis module 2 and carbon dioxide from the mobile energy terminal, and synthesize green methanol under the action of a catalyst and store it. And a semi-closed carbon dioxide power generation system 8 using methanol as fuel installed at the mobile energy consumption terminal. The semi-closed carbon dioxide power generation system 8 is used to generate electricity by combustion using methanol and oxygen as fuel, and stores the high-purity, high-pressure carbon dioxide generated by combustion in batches, which is supplied to the methanol synthesis module 6 for resynthesizing methanol when replenishing energy. When the mobile energy-consuming terminal approaches the methanol synthesis module 6 for energy replenishment, the high-pressure, high-purity carbon dioxide stored in the mobile energy-consuming terminal is unloaded to the production capacity terminal, and the green methanol stored in the production capacity terminal and the oxygen produced by the water electrolysis module 2 are provided to the mobile energy-consuming terminal.

[0005] In some embodiments, the semi-closed carbon dioxide power generation system 8 includes: Supercharger, combustion chamber, expansion generator, regenerator, cooler, separation equipment, methanol supply system, oxygen supply system; Oxygen and carbon dioxide are mixed and enter the combustion chamber, where they are burned with methanol to generate high-temperature flue gas composed of carbon dioxide and water. The high-temperature flue gas is then cooled by the expansion generator, the regenerator, and the cooler before entering the separation device. The water is discharged in liquid form, and a portion of the high-pressure carbon dioxide is stored in a carbon dioxide storage tank to supply the methanol synthesis module 6. The remaining carbon dioxide is cooled by the cooler and then enters the pressurization device and the regenerator to form a new cycle.

[0006] In some embodiments, the renewable energy power generation module 1 is selected from one or more combined forms of wind power generation, solar power generation, and wave power generation.

[0007] In some embodiments, the water electrolysis module 2 is a freshwater electrolysis module or a seawater electrolysis module.

[0008] In some embodiments, it also includes: The hydrogen pressurization and storage module is used to pressurize and temporarily store the hydrogen produced by the water electrolysis module 2. The power required for pressurization comes from the renewable energy power generation module 1.

[0009] In some embodiments, it also includes: The oxygen pressurization, liquefaction and storage module is used to pressurize, liquefy and temporarily store the oxygen produced by the water electrolysis module 2. The required electricity comes from the renewable energy power generation module 1.

[0010] In some embodiments, it also includes: Carbon dioxide storage tank 5 is used to store high-pressure, high-purity carbon dioxide from the mobile energy-consuming terminal and to supply carbon dioxide to the methanol synthesis module 6.

[0011] In some embodiments, when the water electrolysis module 2 electrolyzes water, the water first enters the oxygen pressurization liquefaction module, the hydrogen pressurization module, or the methanol synthesis module 6 for endothermic evaporation before entering the water electrolysis module 2, so as to reduce the energy consumption of water electrolysis.

[0012] This invention provides a zero-carbon emission energy conversion process. Based on the zero-carbon emission energy conversion system described in any of the above embodiments, the process includes the following steps: Step S1: Use renewable energy power generation module 1 to generate electricity, and use water electrolysis module 2 to produce hydrogen and oxygen; Step S2: The hydrogen and carbon dioxide from the mobile energy terminal are fed into the methanol synthesis module 6 to synthesize green methanol under the action of a catalyst and then stored. Step S3: When the mobile energy consumer approaches the production capacity end for energy replenishment, the high-pressure, high-purity carbon dioxide stored at the mobile energy consumer is unloaded to the production capacity end, while the green methanol stored at the production capacity end and the oxygen generated by water electrolysis are supplied to the mobile energy consumer. Step S4: In the semi-closed carbon dioxide power generation system 8 at the mobile energy consumption end, methanol and oxygen are burned to generate high-temperature flue gas composed of carbon dioxide and water. After the high-temperature flue gas expands, does work, is reheated and cooled, it enters the separation equipment. The water is discharged in the form of liquid water. A portion of the high-pressure carbon dioxide enters the carbon dioxide storage tank for storage and is used to supply the methanol synthesis module 6. The remaining carbon dioxide is cooled, pressurized and reheated to form a new cycle.

[0013] In some embodiments, in step S1, when the water electrolysis module 2 electrolyzes seawater, the seawater first enters the oxygen pressurization liquefaction process, the hydrogen pressurization process, or the methanol synthesis process for heat absorption and evaporation before entering the water electrolysis module 2, so as to reduce the energy consumption of water electrolysis.

[0014] In the above embodiments of the present invention, a semi-closed CO2 power generation system is deeply coupled with a renewable energy-to-methanol process to form a complete carbon cycle closed loop. All CO2 generated from the combustion of methanol at mobile energy consumption points (such as ships) is captured and reused in methanol synthesis. The entire process produces zero carbon emissions into the atmosphere, fundamentally solving the dilemma of the lack of reliable net-zero emission technologies in industries such as shipping, and meeting the net-zero greenhouse gas emission target requirements.

[0015] Traditional green methanol production processes typically require coupled biomass gasification or a separate carbon capture unit to obtain the CO2 needed for methanol synthesis, resulting in high equipment investment and high energy consumption. This invention directly utilizes high-purity, high-pressure CO2 generated by combustion in a semi-closed CO2 power generation system as a raw material for methanol synthesis, eliminating the need for an additional carbon capture unit. This saves on equipment investment and avoids the high energy consumption of the carbon capture process, significantly reducing the overall system cost.

[0016] The oxygen produced by the water electrolysis module is pressurized and liquefied before being supplied to the semi-closed CO2 power generation system as an oxidant, replacing the need for air separation oxygen production in traditional power systems. After the oxygen is burned with methanol in the power generation system, the final products are CO2 and water. The oxygen is fully utilized, eliminating the need for an additional air separation unit, further simplifying the system structure and reducing energy consumption and investment costs.

[0017] This invention achieves an energy conversion efficiency exceeding 60%, approximately 10 percentage points higher than existing advanced diesel engine power. The semi-closed CO2 power generation system uses CO2 as the working fluid in a cycle, and through optimization of thermodynamic processes such as regeneration and cooling, significantly improves energy utilization efficiency. Simultaneously, the system eliminates the bulky and heavy carbon capture devices found in traditional zero-carbon solutions, offering high power density and making it particularly suitable for space-constrained mobile energy use scenarios such as ships.

[0018] All the green methanol synthesized at the production end is supplied to the mobile energy consumption end, while all the CO2 generated at the mobile energy consumption end is returned to the production end for re-synthesizing methanol. Methanol, as an energy carrier, circulates in a closed loop within the system without loss or waste, achieving sustainable energy recycling. Attached Figure Description

[0019] The accompanying drawings illustrate, by way of example and not limitation, the various embodiments discussed herein.

[0020] Figure 1 This is a schematic diagram of the zero-carbon emission energy conversion system architecture according to an embodiment of the present invention. Detailed Implementation

[0021] In order to gain a more detailed understanding of the features and technical content of the embodiments of this application, the implementation of the embodiments of this application will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of this application.

[0022] In the embodiments described in this application, it should be noted that, unless otherwise stated and limited, the term "connection" should be interpreted broadly. For example, it can be an electrical connection, or a connection between two internal components. It can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above term according to the specific circumstances.

[0023] It should be noted that the terms "first," "second," and "third" used in the embodiments of this application are merely used to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first," "second," and "third" can be interchanged in a specific order or sequence where permitted. It should be understood that the objects distinguished by "first," "second," and "third" can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in an order other than those illustrated or described herein.

[0024] This invention provides a zero-carbon emission energy conversion system, such as... Figure 1 As shown, the system includes: Renewable energy generation module 1, used to generate electricity.

[0025] The water electrolysis module 2 is electrically connected to the renewable energy power generation module 1 and is used to produce hydrogen and oxygen by electrolyzing water using electrical energy.

[0026] The methanol synthesis module 6 is used to receive hydrogen produced by the water electrolysis module 2 and carbon dioxide from the mobile energy terminal, and synthesize green methanol under the action of a catalyst and store it.

[0027] And a semi-closed carbon dioxide power generation system 8 using methanol as fuel installed at the mobile energy consumption terminal. The semi-closed carbon dioxide power generation system 8 is used to generate electricity by burning methanol and oxygen as fuel, and stores the high-purity, high-pressure carbon dioxide generated by combustion in batches, which is then supplied to the methanol synthesis module 6 for resynthesizing methanol when replenishing energy.

[0028] When the mobile energy-consuming terminal approaches the methanol synthesis module 6 for energy replenishment, the high-pressure, high-purity carbon dioxide stored in the mobile energy-consuming terminal is unloaded to the production capacity terminal, and the green methanol stored in the production capacity terminal and the oxygen produced by the water electrolysis module 2 are provided to the mobile energy-consuming terminal.

[0029] In some embodiments, the semi-closed carbon dioxide power generation system 8 includes: Supercharger, combustion chamber, expansion generator, regenerator, cooler, separation equipment, methanol supply system, oxygen supply system.

[0030] In this process, oxygen and carbon dioxide are mixed and enter the combustion chamber, where they burn with methanol to produce high-temperature flue gas composed of carbon dioxide and water. The high-temperature flue gas then passes through an expansion generator, is cooled by a regenerator and a cooler, and enters a separation unit. The water is discharged as liquid water, and a portion of the high-pressure carbon dioxide is stored in a carbon dioxide storage tank to supply the methanol synthesis module 6. The remaining carbon dioxide, after being cooled and its temperature adjusted, enters a booster unit and a regenerator, forming a new cycle.

[0031] In some embodiments, the renewable energy power generation module 1 is selected from one or more combined forms of wind power generation, solar power generation, and wave power generation.

[0032] In some embodiments, the water electrolysis module 2 is a freshwater electrolysis module or a seawater electrolysis module.

[0033] In some embodiments, it also includes: The hydrogen pressurization and storage module is used to pressurize and temporarily store the hydrogen produced by the water electrolysis module 2. The power required for pressurization comes from the renewable energy power generation module 1.

[0034] In some embodiments, it also includes: The oxygen pressurization, liquefaction and storage module is used to pressurize, liquefy and temporarily store the oxygen produced by the water electrolysis module 2. The required power comes from the renewable energy power generation module 1.

[0035] In some embodiments, it also includes: Carbon dioxide storage tank 5 is used to store high-pressure, high-purity carbon dioxide from the mobile energy consumption end and to supply carbon dioxide to methanol synthesis module 6.

[0036] In some embodiments, when the water electrolysis module 2 electrolyzes water, the water first enters the oxygen pressurization liquefaction module, the hydrogen pressurization module, or the methanol synthesis module 6 for endothermic evaporation before entering the water electrolysis module 2, so as to reduce the energy consumption of water electrolysis.

[0037] This invention provides a zero-carbon emission energy conversion process. The zero-carbon emission energy conversion system based on any of the above embodiments includes the following steps: Step S1: Use renewable energy power generation module 1 to generate electricity, and use water electrolysis module 2 to produce hydrogen and oxygen.

[0038] Step S2: Hydrogen and carbon dioxide from the mobile energy source are fed into the methanol synthesis module 6 to synthesize green methanol under the action of a catalyst and then stored.

[0039] Step S3: When the mobile energy consumer approaches the production capacity end for energy replenishment, the high-pressure, high-purity carbon dioxide stored at the mobile energy consumer is unloaded to the production capacity end, while the green methanol stored at the production capacity end and the oxygen generated by water electrolysis are supplied to the mobile energy consumer.

[0040] Step S4: In the semi-closed carbon dioxide power generation system 8 at the mobile energy consumption end, methanol and oxygen are burned to generate high-temperature flue gas composed of carbon dioxide and water. After expansion, reheating, and cooling, the high-temperature flue gas enters the separation equipment. The water is discharged in liquid form, and a portion of the high-pressure carbon dioxide is stored in a carbon dioxide storage tank to supply the methanol synthesis module 6. The remaining carbon dioxide is cooled, pressurized, and reheated to form a new cycle.

[0041] In some embodiments, during step S1, when the water electrolysis module 2 electrolyzes water, the water first enters the oxygen pressurization liquefaction process, the hydrogen pressurization process, or the methanol synthesis process for heat absorption and evaporation before entering the water electrolysis module 2, so as to reduce the energy consumption of water electrolysis.

[0042] The above embodiments of the present invention propose a zero-carbon emission energy conversion scheme that deeply couples a semi-closed CO2 power generation system with a renewable energy-to-methanol process, forming a complete carbon cycle closed loop. All CO2 generated from the combustion of methanol at mobile energy-consuming terminals (such as ships) is captured and reused in methanol synthesis. The entire process produces zero carbon emissions into the atmosphere, fundamentally solving the dilemma of the lack of reliable net-zero emission technologies in industries such as shipping, and meeting the International Maritime Organization's 2050 net-zero greenhouse gas emission target.

[0043] With an energy conversion efficiency exceeding 60%, this is approximately 10 percentage points higher than existing advanced diesel engine power. The semi-closed CO2 power generation system uses CO2 as the working fluid in its cycle and optimizes thermodynamic processes such as regeneration and cooling, significantly improving energy utilization efficiency. Simultaneously, the system eliminates the bulky and heavy carbon capture devices found in traditional zero-carbon solutions, offering high power density and making it particularly suitable for space-constrained mobile energy use scenarios such as ships.

[0044] Traditional green methanol production processes typically require coupled biomass gasification or a separate carbon capture unit to obtain the CO2 needed for methanol synthesis, resulting in high equipment investment and high energy consumption. This invention directly utilizes high-purity, high-pressure CO2 generated by combustion in a semi-closed CO2 power generation system as a raw material for methanol synthesis, eliminating the need for an additional carbon capture unit. This saves on equipment investment and avoids the high energy consumption of the carbon capture process, significantly reducing the overall system cost.

[0045] The oxygen produced by the water electrolysis module is pressurized and liquefied before being supplied to the semi-closed CO2 power generation system as an oxidant, replacing the need for air separation oxygen production in traditional power systems. After the oxygen is burned with methanol in the power generation system, the final products are CO2 and water. The oxygen is fully utilized, eliminating the need for an additional air separation unit, further simplifying the system structure and reducing energy consumption and investment costs.

[0046] This invention presents a process flow that couples a semi-closed CO2 power generation process with a renewable energy-to-methanol process. In literature or conventional processes, renewable energy-to-methanol production typically requires coupling with biomass gasification or carbon capture devices to obtain the CO2 needed for methanol synthesis. This invention proposes coupling a semi-closed CO2 power generation system with renewable energy-to-methanol production, eliminating the need for additional carbon capture, fully utilizing the byproduct oxygen, and requiring no additional air separation unit, thus achieving complete methanol utilization. All green methanol synthesized at the production end is supplied to mobile energy consumers, while all CO2 generated at the mobile energy consumers is returned to the production end for re-synthesizing methanol. Methanol, as an energy carrier, circulates in a closed loop within the system, with no loss or waste, achieving sustainable energy recycling.

[0047] This invention provides an energy conversion system, such as... Figure 1 As shown, the system consists of a renewable energy power generation module 1, a water electrolysis module 2, a methanol synthesis module 6, and a semi-closed carbon dioxide power generation system 8 using methanol as fuel installed at the mobile energy consumption end.

[0048] Renewable energy generation module 1 generates electricity and produces hydrogen and oxygen via water electrolysis module 2. Hydrogen and carbon dioxide stored in storage tank 5 from the mobile energy consumer enter methanol synthesis module 6 to synthesize and store green methanol. When the mobile energy consumer approaches the production unit 6 for refueling, the high-pressure, high-purity carbon dioxide stored at the mobile energy consumer is unloaded to the production unit, while the green methanol stored at the production unit and the oxygen produced by the water electrolysis module are supplied to the mobile energy consumer. Methanol and oxygen are converted into electricity through combustion and heat-work conversion within the power generation system at the energy consumer. The high-purity, high-pressure carbon dioxide emitted after the methanol combustion in the semi-closed carbon dioxide power generation system is stored in batches and supplied to the methanol synthesis module at the production unit for resynthesizing methanol during the next refueling.

[0049] The carbon dioxide power generation system 8 is characterized by comprising a pressurization unit, a combustion chamber, an expansion power generation unit, a regenerator, a cooler, a separation unit, a methanol supply system, and an oxygen supply system. Oxygen and carbon dioxide mix and enter the combustion chamber, where they burn with methanol to produce high-temperature flue gas composed of carbon dioxide and water. The high-temperature flue gas passes through a turbine, is cooled by the regenerator and cooler, and then enters the separation unit. Water is discharged as liquid water, and a portion of the high-pressure carbon dioxide is stored in a carbon dioxide storage tank for use in the methanol synthesis module. The remaining carbon dioxide, after being cooled by the cooler, enters the pressurization unit and regenerator, forming a new cycle.

[0050] Renewable energy power generation modules can be wind power generation, solar power generation, wave power generation, or a combination thereof.

[0051] The water electrolysis module can be used for either fresh water electrolysis or seawater electrolysis, and the electricity required for water electrolysis comes from the renewable energy power generation module.

[0052] The system also includes a hydrogen pressurization and storage module, which is used to pressurize and temporarily store the hydrogen produced by the water electrolysis module. The power required for pressurization comes from the renewable energy power generation module. The system also includes an oxygen pressurization, liquefaction and storage module, which is used to pressurize, liquefy and temporarily store the oxygen produced by the water electrolysis module. The required power comes from the renewable energy power generation module.

[0053] Another embodiment of the present invention - a zero-carbon marine energy system Using electricity generated by wind power, 300 kmol of seawater (5.4 tons) is electrolyzed to produce 300 kmol of hydrogen and 150 kmol of oxygen. The 150 kmol of oxygen is pressurized, liquefied, and stored in a tank for later use in power supply to users. The 300 kmol of hydrogen is compressed and reacts with 100 kmol of carbon dioxide from a carbon dioxide storage tank under a catalyst to synthesize 100 kmol of methanol and 100 kmol of water, releasing 4945 MJ of heat. The 100 kmol of methanol (3.2 tons) is then supplied to the energy-consuming side (e.g., a ship equipped with a semi-closed carbon dioxide generator set). In the semi-closed carbon dioxide generator set, it is burned with the 150 kmol of oxygen produced by water electrolysis, releasing 100 kmol of carbon dioxide into a storage tank. The 100 kmol of carbon dioxide can then be used for further methanol synthesis.

[0054] In some embodiments, the compressed hydrogen pressure is 6.5 MPa, the high-pressure carbon dioxide discharged from the energy-consuming side is 7 MPa, and the methanol synthesis pressure is 6 MPa.

[0055] In some embodiments, before entering the water electrolysis module, seawater first enters the oxygen pressurization liquefaction, hydrogen pressurization, or methanol synthesis module for endothermic evaporation, in order to reduce the energy consumption of water electrolysis.

[0056] The technical solutions described in the embodiments of this application can be combined arbitrarily without conflict.

[0057] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A zero-carbon emission energy conversion system, characterized in that, include: Renewable energy generation module (1), used to generate electrical energy; The water electrolysis module (2) is electrically connected to the renewable energy power generation module (1) and is used to electrolyze water using the electrical energy to produce hydrogen and oxygen. The methanol synthesis module (6) is used to receive hydrogen produced by the water electrolysis module (2) and carbon dioxide from the mobile energy terminal, and synthesize green methanol under the action of a catalyst and store it. And a semi-closed carbon dioxide power generation system (8) using methanol as fuel installed at the mobile energy consumption terminal. The semi-closed carbon dioxide power generation system (8) is used to generate electricity by combustion using methanol and oxygen as fuel, and to store the high-purity, high-pressure carbon dioxide generated by combustion in batches, which is supplied to the methanol synthesis module (6) for resynthesizing methanol when replenishing energy. When the mobile energy-consuming end approaches the methanol synthesis module (6) for energy replenishment, the high-pressure, high-purity carbon dioxide stored in the mobile energy-consuming end is unloaded to the production end, and the green methanol stored in the production end and the oxygen produced by the water electrolysis module (2) are provided to the mobile energy-consuming end.

2. The zero-carbon emission energy conversion system according to claim 1, characterized in that, The semi-closed carbon dioxide power generation system (8) includes: Supercharger, combustion chamber, expansion generator, regenerator, cooler, separation equipment, methanol supply system, oxygen supply system; Oxygen and carbon dioxide are mixed and enter the combustion chamber, where they are burned with methanol to generate high-temperature flue gas composed of carbon dioxide and water. The high-temperature flue gas is then cooled by the expansion generator, the regenerator, and the cooler before entering the separation device. Water is discharged in liquid form, and a portion of the high-pressure carbon dioxide is stored in a carbon dioxide storage tank to supply the methanol synthesis module (6). The remaining carbon dioxide is cooled by the cooler and then enters the booster and the regenerator to form a new cycle.

3. The zero-carbon emission energy conversion system according to claim 1 or 2, characterized in that, The renewable energy power generation module (1) is selected from one or more of wind power generation, solar power generation, and wave power generation in combination.

4. The zero-carbon emission energy conversion system according to claim 1 or 2, characterized in that, The water electrolysis module (2) is either a fresh water electrolysis module or a seawater electrolysis module.

5. The zero-carbon emission energy conversion system according to claim 1 or 2, characterized in that, Also includes: The hydrogen pressurization and storage module is used to pressurize and temporarily store the hydrogen produced by the water electrolysis module (2). The power required for pressurization comes from the renewable energy power generation module (1).

6. The zero-carbon emission energy conversion system according to claim 1 or 2, characterized in that, Also includes: The oxygen pressurization, liquefaction and storage module is used to pressurize, liquefy and temporarily store the oxygen produced by the water electrolysis module (2), and the required power comes from the renewable energy power generation module (1).

7. The zero-carbon emission energy conversion system according to claim 1 or 2, characterized in that, Also includes: A carbon dioxide storage tank (5) is used to store high-pressure, high-purity carbon dioxide from the mobile energy-consuming end and to supply carbon dioxide to the methanol synthesis module (6).

8. The zero-carbon emission energy conversion system according to claim 1 or 2, characterized in that, When the water electrolysis module (2) electrolyzes water, the water first enters the oxygen pressurization liquefaction module, the hydrogen pressurization module, or the methanol synthesis module (6) for heat absorption and evaporation before entering the water electrolysis module (2) to reduce the energy consumption of water electrolysis.

9. A zero-carbon emission energy conversion process, based on the zero-carbon emission energy conversion system according to any one of claims 1 to 8, characterized in that, Includes the following steps: Step S1: Use the renewable energy power generation module (1) to generate electricity, and use the water electrolysis module (2) to electrolyze water to produce hydrogen and oxygen; Step S2: The hydrogen and carbon dioxide from the mobile energy terminal are fed into the methanol synthesis module (6) to synthesize green methanol under the action of a catalyst and store it. Step S3: When the mobile energy consumer approaches the production capacity end for energy replenishment, the high-pressure, high-purity carbon dioxide stored at the mobile energy consumer is unloaded to the production capacity end, while the green methanol stored at the production capacity end and the oxygen generated by water electrolysis are supplied to the mobile energy consumer. Step S4: In the semi-closed carbon dioxide power generation system (8) at the mobile energy consumption end, methanol and oxygen are burned to generate high-temperature flue gas composed of carbon dioxide and water. After the high-temperature flue gas expands, does work, is reheated and cooled, it enters the separation equipment. The water is discharged in the form of liquid water. A portion of the high-pressure carbon dioxide enters the carbon dioxide storage tank for storage and is used to supply the methanol synthesis module (6). The remaining carbon dioxide is cooled, pressurized and reheated to form a new cycle.

10. The zero-carbon emission energy conversion process according to claim 9, characterized in that, In step S1, when the water electrolysis module (2) electrolyzes water, the water first enters the oxygen pressurization liquefaction process, the hydrogen pressurization process, or the methanol synthesis process to absorb heat and evaporate before entering the water electrolysis module (2), so as to reduce the energy consumption of water electrolysis.

Images