Methanol preparation system and method using off-grid green electricity

Abstract

The invention provides a methanol preparation system and method using off-grid green power. The system comprises an off-grid green power supply subsystem, a material supply subsystem, a power generation subsystem, a power supply center and a methanol synthesis subsystem, the off-grid green power supply subsystem is used for providing electric energy for the material supply subsystem and the power supply center; the feeding subsystem is used for providing hydrogen for the power generation subsystem and providing hydrogen and carbon dioxide for the methanol synthesis subsystem; the power generation subsystem is used for providing electric energy for the power supply center and providing heat energy for the methanol synthesis subsystem, the power supply center is used for integrating the electric energy and providing the integrated electric energy for the methanol synthesis subsystem, and the methanol synthesis subsystem is used for providing methanol for the power generation subsystem. According to the scheme, stable electric energy can be provided for methanol preparation by integrating the off-grid green power supply subsystem, the material supply subsystem and the power generation subsystem, the economical efficiency and stability of the methanol synthesis process are improved, and efficient operation of the process is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of methanol preparation, and in particular to a methanol preparation system and method using off-grid green electricity. Background Art

[0002] In the field of methanol production, traditional production processes mostly rely on fossil energy, which not only consumes a large amount of resources such as coal and natural gas, but also produces a large amount of carbon dioxide and other pollutants, causing serious impacts on the environment. In addition, the energy consumption in the methanol production process is also high, which increases production costs. Therefore, in order to reduce dependence on fossil energy and reduce environmental pollution, the use of clean energy for methanol production has become the mainstream trend of current technological development.

[0003] However, as important components of clean energy, wind and solar energy have the characteristics of being pollution-free and renewable, but their power generation is greatly affected by natural conditions and has problems of intermittency and instability. Therefore, how to achieve stable methanol production on the basis of solving this problem is a difficult problem in existing technologies. Summary of the invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a methanol preparation system and method using off-grid green electricity, which can integrate the off-grid green electricity supply subsystem, feeding subsystem and power generation subsystem to provide stable electricity for methanol preparation, improve the economy and stability of the methanol synthesis process, and realize efficient operation of the process.

[0005] In order to solve the above technical problems, this application provides the following technical solutions:

[0006] According to a first aspect of an embodiment of the present application, there is provided a methanol production system using off-grid green electricity, including an off-grid green electricity supply subsystem, a feed subsystem, a power generation subsystem, a power supply center, and a methanol synthesis subsystem;

[0007] The off-grid green electricity supply subsystem is electrically connected to the supply subsystem and the power supply center respectively, and is used to provide electric energy to the supply subsystem and the power supply center;

[0008] The feed subsystem is connected to the power generation subsystem and the methanol synthesis subsystem respectively, and is used to provide hydrogen to the power generation subsystem and to provide hydrogen and carbon dioxide to the methanol synthesis subsystem;

[0009] The power generation subsystem, the power supply center and the methanol synthesis subsystem are connected in pairs. The power generation subsystem is used to provide electrical energy to the power supply center and to provide thermal energy to the methanol synthesis subsystem. The power supply center is used to integrate electrical energy and provide the integrated electrical energy to the methanol synthesis subsystem. The methanol synthesis subsystem is used to provide methanol to the power generation subsystem.

[0010] Further, the feed subsystem includes a carbon dioxide supply device, a hydrogen production device and a hydrogen storage device;

[0011] The carbon dioxide supply device is connected to the methanol synthesis subsystem and is used to provide carbon dioxide to the methanol synthesis subsystem;

[0012] The off-grid green electricity supply subsystem is electrically connected to the hydrogen production equipment for providing electrical energy to the hydrogen production equipment. The hydrogen production equipment is respectively connected to the methanol synthesis subsystem and the hydrogen storage equipment for providing hydrogen to the methanol synthesis subsystem and the hydrogen storage equipment. The hydrogen storage equipment is respectively connected to the methanol synthesis subsystem and the power generation subsystem for providing hydrogen to the methanol synthesis subsystem and the power generation subsystem.

[0013] Further, the carbon dioxide supply equipment includes carbon dioxide collection equipment and carbon dioxide storage equipment;

[0014] The carbon dioxide collection device is connected to the carbon dioxide storage device for providing carbon dioxide to the carbon dioxide storage device, and the carbon dioxide storage device is connected to the methanol synthesis subsystem for providing carbon dioxide to the methanol synthesis subsystem.

[0015] Furthermore, the off-grid green electricity supply subsystem includes off-grid green electricity and electricity storage equipment;

[0016] The off-grid green electricity is electrically connected to the feeding subsystem, the power supply center and the power storage device respectively, and is used to provide electric energy to the feeding subsystem, the power supply center and the power storage device;

[0017] The power storage device is electrically connected to the power supply center and is used to provide electric energy to the power supply center.

[0018] Furthermore, the off-grid green electricity is off-grid wind / solar power generation.

[0019] Furthermore, the power generation subsystem adopts a gas turbine generator set.

[0020] According to a second aspect of an embodiment of the present application, a method for producing methanol using off-grid green electricity is provided, which is applied to any of the above-mentioned methanol production systems using off-grid green electricity, comprising:

[0021] Acquire generated electric energy data corresponding to the electric energy generated by the off-grid green electricity supply subsystem;

[0022] Determine whether the generated electric energy data can simultaneously satisfy the normal operation of the hydrogen production process of the feed subsystem and the methanol synthesis process of the methanol synthesis subsystem; the normal operation indicates that the operation index of the process within the preset time is within the preset range;

[0023] In the case where the generated power data cannot simultaneously satisfy the normal operation of the hydrogen production process of the feed subsystem and the methanol synthesis process of the methanol synthesis subsystem, determining whether the generated power data can satisfy the normal operation of the methanol synthesis process of the methanol synthesis subsystem;

[0024] In the case where the generated power data cannot satisfy the normal operation of the methanol synthesis process of the methanol synthesis subsystem, determining whether the sum of the generated power data and the stored power data corresponding to the power stored in the off-grid green electricity supply subsystem can satisfy the normal operation of the methanol synthesis process of the methanol synthesis subsystem;

[0025] When the sum of the generated electric energy data and the stored electric energy data can satisfy the normal operation of the methanol synthesis process of the methanol synthesis subsystem, the electric energy generated and stored by the off-grid green electricity supply subsystem is provided to the power supply center, so that the power supply center integrates the electric energy and provides the integrated electric energy to the methanol synthesis subsystem, and the hydrogen stored in the feeding subsystem is provided to the methanol synthesis subsystem, so that the methanol synthesis process can operate normally.

[0026] Furthermore, the method further comprises:

[0027] In the case where the sum of the generated electric energy data and the stored electric energy data cannot satisfy the normal operation of the methanol synthesis process of the methanol synthesis subsystem, it is determined whether the hydrogen stored in the feeding subsystem can simultaneously satisfy the supply of hydrogen to the methanol synthesis subsystem and the power generation subsystem to achieve the normal operation of the methanol synthesis process;

[0028] In the case that the hydrogen stored in the feeding subsystem can provide hydrogen for both the methanol synthesis subsystem and the power generation subsystem, the electric energy generated and stored by the off-grid green electricity supply subsystem is provided to the power supply center, and the hydrogen stored in the feeding subsystem is provided to the power generation subsystem, so that the power generation subsystem generates electric energy and provides the generated electric energy to the power supply center, so that the power supply center integrates the electric energy and provides the integrated electric energy to the methanol synthesis subsystem, and so that the feeding subsystem provides the stored hydrogen to the methanol synthesis subsystem, and the power generation subsystem is used to provide thermal energy to the methanol synthesis subsystem, so that the methanol synthesis process of the methanol synthesis subsystem operates normally.

[0029] Furthermore, the method further comprises:

[0030] In the case that the hydrogen stored in the feeding subsystem cannot satisfy the need to provide hydrogen for the methanol synthesis subsystem and the power generation subsystem at the same time, the electric energy generated and stored by the off-grid green electricity supply subsystem is provided to the power supply center, and the methanol synthesis subsystem is used to provide methanol for the power generation subsystem, so that the power generation subsystem generates electric energy and provides it to the power supply center, and then the power supply center integrates the electric energy and provides the integrated electric energy to the methanol synthesis subsystem, and the power generation subsystem provides thermal energy to the methanol synthesis subsystem, and the hydrogen stored in the feeding subsystem is used to provide hydrogen to the methanol synthesis subsystem, so that the methanol synthesis process of the methanol synthesis subsystem operates at minimum load conditions.

[0031] Furthermore, the method further comprises:

[0032] When the generated electric energy data can satisfy the normal operation of the methanol synthesis process of the methanol synthesis subsystem, the electric energy generated by the off-grid green electricity supply subsystem is provided to the power supply center, so that the power supply center integrates the electric energy and provides the integrated electric energy to the methanol synthesis subsystem, and the hydrogen stored in the feeding subsystem is provided to the methanol synthesis subsystem, so that the methanol synthesis process can operate normally.

[0033] Furthermore, the method further comprises:

[0034] In the case where the generated electric energy data can simultaneously satisfy the normal operation of the hydrogen production process of the feed subsystem and the methanol synthesis process of the methanol synthesis subsystem, the off-grid green electricity supply subsystem provides electric energy for the feed subsystem, and provides electric energy for the methanol synthesis subsystem through the power supply center, so that the feed subsystem generates hydrogen through the hydrogen production process and provides it to the methanol synthesis subsystem to realize the methanol synthesis process;

[0035] Determine whether there is redundant power;

[0036] In the presence of redundant electric energy, a portion of the redundant electric energy is stored in the off-grid green electricity supply subsystem, and another portion of the redundant electric energy is used to provide electric energy to the supply subsystem, so that the supply subsystem can generate hydrogen for storage.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The methanol preparation system using off-grid green electricity provided by the present invention can integrate the off-grid green electricity supply subsystem, the feeding subsystem and the power generation subsystem to provide stable electric energy for methanol preparation, so that even in remote areas or areas with underdeveloped power grids, the stable operation of the methanol synthesis process can be achieved, thereby improving the economy and stability of the methanol synthesis process. At the same time, the power generation subsystem is also used to provide thermal energy for the methanol synthesis subsystem, so that it is applied to the methanol synthesis process, thereby improving the utilization rate of energy and achieving efficient operation of the process. Moreover, the system avoids the shutdown of the methanol synthesis process by integrating the off-grid green electricity supply subsystem, the feeding subsystem and the power generation subsystem, thereby effectively avoiding problems such as affecting production efficiency, damaging equipment life, increasing production costs and bringing safety hazards. In addition, since the system mainly uses off-grid green electricity to provide electric energy for methanol preparation, compared with the traditional use of fossil energy for methanol preparation, the dependence of the methanol synthesis process on fossil energy is reduced, environmental pollution is reduced, energy utilization efficiency is improved, and production costs are reduced.

[0039] The present invention also provides a method for preparing methanol using off-grid green electricity. The method for preparing methanol using off-grid green electricity is applied to the above-mentioned methanol preparation system using off-grid green electricity. Since the method for preparing methanol using off-grid green electricity includes the technical solution of the above-mentioned methanol preparation system using off-grid green electricity, it has the corresponding technical effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0041] Figure 1 A schematic structural diagram of a methanol production system utilizing off-grid green electricity provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0043] Embodiment 1:

[0044] See also Figure 1 , a methanol production system using off-grid green electricity provided in an embodiment of the present application includes an off-grid green electricity supply subsystem, a feed subsystem, a power generation subsystem, a power supply center and a methanol synthesis subsystem;

[0045] The off-grid green electricity supply subsystem is electrically connected to the feeding subsystem and the power supply center respectively, and is used to provide electric energy to the feeding subsystem and the power supply center;

[0046] The feeding subsystem is connected to the power generation subsystem and the methanol synthesis subsystem respectively, and is used to provide hydrogen to the power generation subsystem and to provide hydrogen and carbon dioxide to the methanol synthesis subsystem;

[0047] The power generation subsystem, the power supply center and the methanol synthesis subsystem are connected in pairs. The power generation subsystem is used to provide electrical energy to the power supply center and to provide thermal energy to the methanol synthesis subsystem. The power supply center is used to integrate electrical energy and provide the integrated electrical energy to the methanol synthesis subsystem. The methanol synthesis subsystem is used to provide methanol to the power generation subsystem.

[0048] In a specific embodiment, the off-grid green electricity supply subsystem includes off-grid green electricity and power storage equipment; the off-grid green electricity is electrically connected to the feeding subsystem, the power supply center and the power storage equipment respectively, and is used to provide electric energy to the feeding subsystem, the power supply center and the power storage equipment; the power storage equipment is electrically connected to the power supply center, and is used to provide electric energy to the power supply center; wherein the off-grid green electricity is off-grid wind / solar power generation, that is, the off-grid green electricity adopts off-grid wind power generation or off-grid solar power generation, and the power storage equipment can adopt battery energy storage;

[0049] The feeding subsystem includes carbon dioxide supply equipment, hydrogen production equipment and hydrogen storage equipment; the carbon dioxide supply equipment is connected to the methanol synthesis subsystem to provide carbon dioxide for the methanol synthesis subsystem; the off-grid green electricity supply subsystem is electrically connected to the hydrogen production equipment to provide electrical energy for the hydrogen production equipment, the hydrogen production equipment is connected to the methanol synthesis subsystem and the hydrogen storage equipment respectively to provide hydrogen for the methanol synthesis subsystem and the hydrogen storage equipment, the hydrogen storage equipment is connected to the methanol synthesis subsystem and the power generation subsystem respectively to provide hydrogen for the methanol synthesis subsystem and the power generation subsystem; wherein the carbon dioxide supply equipment includes carbon dioxide collection equipment and carbon dioxide storage equipment; The carbon dioxide collection device is connected to the carbon dioxide storage device to provide carbon dioxide for the carbon dioxide storage device, and the carbon dioxide storage device is connected to the methanol synthesis subsystem to provide carbon dioxide for the methanol synthesis subsystem; the carbon dioxide collection device can obtain carbon dioxide through capture or other sources, and the carbon dioxide capture method is not limited to chemical absorption, physical absorption, physical adsorption, membrane separation, low-temperature distillation and emerging technologies, etc. The power source of the carbon dioxide collection device can be the redundant power of the off-grid green power supply subsystem, or other sources; the power source of the hydrogen production equipment is off-grid green electricity, and it produces hydrogen by electrolyzing water;

[0050] The power generation subsystem uses a gas turbine generator set;

[0051] The power supply center is used to integrate the electric energy provided by off-grid green electricity, power storage equipment, and power generation subsystems, and provide the integrated electric energy to the methanol synthesis subsystem so that the methanol synthesis subsystem can obtain a stable power supply.

[0052] In a specific implementation scenario, the structure of the system is as follows Figure 1 As shown, the specific operating principle is as follows:

[0053] 1. Off-grid wind / solar power generation, including ① for water electrolysis to produce hydrogen; ② for direct power supply to the power supply center; ③ for battery energy storage (short-term energy storage);

[0054] 2. Hydrogen produced by electrolysis of water and CO2 (captured or from other sources) are used to produce methanol using the synthetic methanol process;

[0055] 3. Since the methanol synthesis process requires stable electricity, a power supply center is used to provide stable power supply; typical situation:

[0056] 1) The electricity generated by wind / solar power generation is sufficient and exceeds the time required by the above-mentioned process devices: that is, under the normal operation of water electrolysis hydrogen production and methanol synthesis processes, the excess wind / solar power generation energy is stored in batteries and hydrogen is stored through water electrolysis hydrogen production;

[0057] 2) When the electricity generated by wind / solar power generation cannot simultaneously meet the normal operation of water electrolysis hydrogen production and methanol synthesis processes, battery energy storage can be used to supplement electricity. The power supply center can provide stable electricity to the methanol synthesis process and use the stored hydrogen to ensure the normal operation of the methanol synthesis process;

[0058] 3) When the electricity generated by wind / solar power generation cannot simultaneously meet the normal operation of water electrolysis hydrogen production and methanol synthesis processes, the battery energy storage is first used to supplement the electricity, and then the stored hydrogen is burned by the gas turbine unit to generate electricity, ensuring that the power supply center can provide stable electricity to the methanol synthesis process and use the stored hydrogen to ensure the normal operation of the methanol synthesis process;

[0059] At the same time, the exhaust waste heat of the gas turbine generator set can also be used in the methanol synthesis process to improve energy utilization;

[0060] 4) When the electricity generated by wind / solar power generation cannot simultaneously meet the normal operation of water electrolysis hydrogen production and methanol synthesis processes, the gas turbine unit is used to burn methanol to generate electricity, and the stored hydrogen is used to maintain the methanol synthesis process at the minimum load condition to avoid process shutdown;

[0061] The power supply center is an electricity integration center that provides the methanol synthesis process with the required stable electricity.

[0062] In this embodiment, the system is designed to operate off-grid using wind / solar power generation, supplemented by battery energy storage and hydrogen / methanol fuel to generate electricity for the gas turbine generator set, which can provide more stable electricity and make the overall process more economical and efficient.

[0063] Embodiment 2:

[0064] The present application also provides a method for preparing methanol using off-grid green electricity, comprising:

[0065] Obtaining generated power data corresponding to the power generated by the off-grid green power supply subsystem;

[0066] Determine whether the generated electric energy data can simultaneously meet the normal operation of the hydrogen production process of the feed subsystem and the methanol synthesis process of the methanol synthesis subsystem; normal operation indicates that the operating indicators of the process within the preset time are within the preset range;

[0067] In the case where the generated power data cannot simultaneously satisfy the normal operation of the hydrogen production process of the feed subsystem and the methanol synthesis process of the methanol synthesis subsystem, it is determined whether the generated power data can satisfy the normal operation of the methanol synthesis process of the methanol synthesis subsystem;

[0068] In the case where the generated power data cannot satisfy the normal operation of the methanol synthesis process of the methanol synthesis subsystem, it is determined whether the sum of the generated power data and the stored power data corresponding to the power stored in the off-grid green power supply subsystem can satisfy the normal operation of the methanol synthesis process of the methanol synthesis subsystem;

[0069] When the sum of the generated electricity data and the stored electricity data can meet the normal operation of the methanol synthesis process of the methanol synthesis subsystem, the electricity generated and stored by the off-grid green electricity supply subsystem is provided to the power supply center, so that the power supply center integrates the electricity and provides the integrated electricity to the methanol synthesis subsystem, and the hydrogen stored in the feeding subsystem is provided to the methanol synthesis subsystem, so that the methanol synthesis process can operate normally.

[0070] In an optional embodiment, the method further includes:

[0071] In the case where the sum of the generated power data and the stored power data cannot satisfy the normal operation of the methanol synthesis process of the methanol synthesis subsystem, it is determined whether the hydrogen stored in the feeding subsystem can simultaneously satisfy the supply of hydrogen to the methanol synthesis subsystem and the power generation subsystem to achieve the normal operation of the methanol synthesis process;

[0072] When the hydrogen stored in the feeding subsystem can provide hydrogen for both the methanol synthesis subsystem and the power generation subsystem, the electric energy generated and stored by the off-grid green electricity power supply subsystem is provided to the power supply center, and the hydrogen stored in the feeding subsystem is provided to the power generation subsystem, so that the power generation subsystem generates electric energy and provides the generated electric energy to the power supply center, and then the power supply center integrates the electric energy and provides the integrated electric energy to the methanol synthesis subsystem, and the feeding subsystem provides the stored hydrogen to the methanol synthesis subsystem, and utilizes the power generation subsystem to provide heat energy to the methanol synthesis subsystem, so that the methanol synthesis process of the methanol synthesis subsystem operates normally.

[0073] In an optional embodiment, the method further includes:

[0074] When the hydrogen stored in the feeding subsystem cannot satisfy the requirement of providing hydrogen for both the methanol synthesis subsystem and the power generation subsystem, the electric energy generated and stored by the off-grid green electricity supply subsystem is provided to the power supply center, and the methanol synthesis subsystem is used to provide methanol for the power generation subsystem, so that the power generation subsystem generates electric energy and provides it to the power supply center, and then the power supply center integrates the electric energy and provides the integrated electric energy to the methanol synthesis subsystem, and the power generation subsystem provides thermal energy to the methanol synthesis subsystem, and the hydrogen stored in the feeding subsystem is used to provide hydrogen to the methanol synthesis subsystem, so that the methanol synthesis process of the methanol synthesis subsystem operates at minimum load conditions.

[0075] In an optional embodiment, the method further includes:

[0076] When the generated electricity data can meet the normal operation of the methanol synthesis process of the methanol synthesis subsystem, the electricity generated by the off-grid green electricity supply subsystem is provided to the power supply center, so that the power supply center integrates the electricity and provides the integrated electricity to the methanol synthesis subsystem, and the hydrogen stored in the feeding subsystem is provided to the methanol synthesis subsystem, so that the methanol synthesis process can operate normally.

[0077] In an optional embodiment, the method further includes:

[0078] Under the condition that the generated electric energy data can simultaneously meet the normal operation of the hydrogen production process of the feed subsystem and the methanol synthesis process of the methanol synthesis subsystem, the off-grid green electricity supply subsystem provides electric energy to the feed subsystem, and provides electric energy to the methanol synthesis subsystem through the power supply center, so that the feed subsystem generates hydrogen through the hydrogen production process and provides it to the methanol synthesis subsystem to realize the methanol synthesis process;

[0079] Determine whether there is redundant power;

[0080] In the presence of redundant electric energy, a portion of the redundant electric energy is stored in the off-grid green electricity supply subsystem, while another portion of the redundant electric energy is used to provide electric energy to the feeding subsystem so that the feeding subsystem can generate hydrogen for storage.

[0081] Specifically, another part of the redundant electric energy can be provided only to the hydrogen production equipment in the feed subsystem for electrolysis of water to produce hydrogen, or it can be provided to the carbon dioxide collection equipment and hydrogen production equipment in the feed subsystem at the same time to achieve carbon dioxide collection and water electrolysis to produce hydrogen.

[0082] It should be noted that the above method embodiment and the system embodiment described in Example 1 belong to the same concept and correspond to each other. Therefore, the implementation method in Example 1 is also applicable to this embodiment and will not be repeated here.

[0083] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A methanol production system using off-grid green electricity, It is characterized in that It includes off-grid green electricity supply subsystem, material supply subsystem, power generation subsystem, power supply center and methanol synthesis subsystem; The off-grid green electricity supply subsystem is electrically connected to the supply subsystem and the power supply center respectively, and is used to provide electric energy to the supply subsystem and the power supply center; The feed subsystem is connected to the power generation subsystem and the methanol synthesis subsystem respectively, and is used to provide hydrogen to the power generation subsystem and to provide hydrogen and carbon dioxide to the methanol synthesis subsystem; The power generation subsystem, the power supply center and the methanol synthesis subsystem are connected in pairs. The power generation subsystem is used to provide electrical energy to the power supply center and to provide thermal energy to the methanol synthesis subsystem. The power supply center is used to integrate electrical energy and provide the integrated electrical energy to the methanol synthesis subsystem. The methanol synthesis subsystem is used to provide methanol to the power generation subsystem.

2. The methanol production system using off-grid green electricity according to claim 1, It is characterized in that The feed subsystem includes a carbon dioxide supply device, a hydrogen production device and a hydrogen storage device; The carbon dioxide supply device is connected to the methanol synthesis subsystem and is used to provide carbon dioxide to the methanol synthesis subsystem; The off-grid green electricity supply subsystem is electrically connected to the hydrogen production equipment for providing electrical energy to the hydrogen production equipment. The hydrogen production equipment is respectively connected to the methanol synthesis subsystem and the hydrogen storage equipment for providing hydrogen to the methanol synthesis subsystem and the hydrogen storage equipment. The hydrogen storage equipment is respectively connected to the methanol synthesis subsystem and the power generation subsystem for providing hydrogen to the methanol synthesis subsystem and the power generation subsystem.

3. The methanol production system using off-grid green electricity according to claim 2, It is characterized in that The carbon dioxide supply equipment includes carbon dioxide collection equipment and carbon dioxide storage equipment; The carbon dioxide collection device is connected to the carbon dioxide storage device for providing carbon dioxide to the carbon dioxide storage device, and the carbon dioxide storage device is connected to the methanol synthesis subsystem for providing carbon dioxide to the methanol synthesis subsystem.

4. The methanol production system using off-grid green electricity according to any one of claims 1 to 3, It is characterized in that The off-grid green electricity supply subsystem includes off-grid green electricity and electricity storage equipment; The off-grid green electricity is electrically connected to the feeding subsystem, the power supply center and the power storage device respectively, and is used to provide electric energy to the feeding subsystem, the power supply center and the power storage device; The power storage device is electrically connected to the power supply center and is used to provide electric energy to the power supply center.

5. The methanol production system using off-grid green electricity according to claim 4, It is characterized in that The off-grid green electricity is off-grid wind / solar power generation.

6. A method for producing methanol using off-grid green electricity, applied to the methanol production system using off-grid green electricity as claimed in any one of claims 1 to 5, It is characterized in that include: Acquire generated electric energy data corresponding to the electric energy generated by the off-grid green electricity supply subsystem; Determine whether the generated electric energy data can simultaneously satisfy the normal operation of the hydrogen production process of the feed subsystem and the methanol synthesis process of the methanol synthesis subsystem; the normal operation indicates that the operation index of the process within the preset time is within the preset range; In the case where the generated power data cannot simultaneously satisfy the normal operation of the hydrogen production process of the feed subsystem and the methanol synthesis process of the methanol synthesis subsystem, determining whether the generated power data can satisfy the normal operation of the methanol synthesis process of the methanol synthesis subsystem; In the case where the generated power data cannot satisfy the normal operation of the methanol synthesis process of the methanol synthesis subsystem, determining whether the sum of the generated power data and the stored power data corresponding to the power stored in the off-grid green electricity supply subsystem can satisfy the normal operation of the methanol synthesis process of the methanol synthesis subsystem; When the sum of the generated electric energy data and the stored electric energy data can satisfy the normal operation of the methanol synthesis process of the methanol synthesis subsystem, the electric energy generated and stored by the off-grid green electricity supply subsystem is provided to the power supply center, so that the power supply center integrates the electric energy and provides the integrated electric energy to the methanol synthesis subsystem, and the hydrogen stored in the feeding subsystem is provided to the methanol synthesis subsystem, so that the methanol synthesis process can operate normally.

7. The method for preparing methanol using off-grid green electricity according to claim 6, It is characterized in that Also includes: In the case where the sum of the generated electric energy data and the stored electric energy data cannot satisfy the normal operation of the methanol synthesis process of the methanol synthesis subsystem, it is determined whether the hydrogen stored in the feeding subsystem can simultaneously satisfy the supply of hydrogen to the methanol synthesis subsystem and the power generation subsystem to achieve the normal operation of the methanol synthesis process; In the case that the hydrogen stored in the feeding subsystem can provide hydrogen for both the methanol synthesis subsystem and the power generation subsystem, the electric energy generated and stored by the off-grid green electricity supply subsystem is provided to the power supply center, and the hydrogen stored in the feeding subsystem is provided to the power generation subsystem, so that the power generation subsystem generates electric energy and provides the generated electric energy to the power supply center, so that the power supply center integrates the electric energy and provides the integrated electric energy to the methanol synthesis subsystem, and so that the feeding subsystem provides the stored hydrogen to the methanol synthesis subsystem, and the power generation subsystem is used to provide thermal energy to the methanol synthesis subsystem, so that the methanol synthesis process of the methanol synthesis subsystem operates normally.

8. The method for preparing methanol using off-grid green electricity according to claim 7, It is characterized in that Also includes: In the case that the hydrogen stored in the feeding subsystem cannot satisfy the need to provide hydrogen for the methanol synthesis subsystem and the power generation subsystem at the same time, the electric energy generated and stored by the off-grid green electricity supply subsystem is provided to the power supply center, and the methanol synthesis subsystem is used to provide methanol for the power generation subsystem, so that the power generation subsystem generates electric energy and provides it to the power supply center, and then the power supply center integrates the electric energy and provides the integrated electric energy to the methanol synthesis subsystem, and the power generation subsystem provides thermal energy to the methanol synthesis subsystem, and the hydrogen stored in the feeding subsystem is used to provide hydrogen to the methanol synthesis subsystem, so that the methanol synthesis process of the methanol synthesis subsystem operates at minimum load conditions.

9. The method for producing methanol using off-grid green electricity according to claim 6, It is characterized in that Also includes: When the generated electric energy data can satisfy the normal operation of the methanol synthesis process of the methanol synthesis subsystem, the electric energy generated by the off-grid green electricity supply subsystem is provided to the power supply center, so that the power supply center integrates the electric energy and provides the integrated electric energy to the methanol synthesis subsystem, and the hydrogen stored in the feeding subsystem is provided to the methanol synthesis subsystem, so that the methanol synthesis process can operate normally.

10. The method for producing methanol using off-grid green electricity according to any one of claims 6 to 9, It is characterized in that Also includes: In the case where the generated electric energy data can simultaneously satisfy the normal operation of the hydrogen production process of the feed subsystem and the methanol synthesis process of the methanol synthesis subsystem, the off-grid green electricity supply subsystem provides electric energy for the feed subsystem, and provides electric energy for the methanol synthesis subsystem through the power supply center, so that the feed subsystem generates hydrogen through the hydrogen production process and provides it to the methanol synthesis subsystem to realize the methanol synthesis process; Determine whether there is redundant power; In the presence of redundant electric energy, a portion of the redundant electric energy is stored in the off-grid green electricity supply subsystem, and another portion of the redundant electric energy is used to provide electric energy to the supply subsystem, so that the supply subsystem can generate hydrogen for storage.

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