Methanol preparation system with combined supply of heat and power

Abstract

The invention provides a combined heat and power methanol preparation system, comprising: a hydrogen production system for preparing hydrogen by using renewable energy; a working medium input end of the methanol synthesis system is connected with a hydrogen output end of the hydrogen production system, and a steam output end of the methanol synthesis system is connected with a steam input end of the steam utilization system; the working medium input end of the gas combined power generation system is connected with the unreacted gas output end of the methanol synthesis system, and the power output end of the gas combined power generation system is connected with the power input end of the hydrogen production system and the power input end of the power utilization system; and the dead steam output end of the gas combined power generation system is connected with the steam input end of the steam utilization system. According to the combined heat and power methanol preparation system disclosed by the invention, steam and unsynthesized gas in the preparation process of methanol are utilized, and energy gradient and full utilization of the system are realized, so that the comprehensive efficiency of the system is effectively improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of cogeneration of heat and power, and in particular to a methanol preparation system for cogeneration of heat and power. Background Art

[0002] Methanol, also known as hydroxymethane, wood alcohol or wood spirit, is an organic compound and the simplest saturated monohydric alcohol. Methanol is very light, highly volatile, colorless, flammable, and has a very similar smell to ethanol (drinking wine). However, unlike ethanol, methanol is highly toxic and cannot be drunk. It is usually used as a solvent, antifreeze, fuel or ethanol denaturant, and can also be used to produce biodiesel through ester exchange reaction.

[0003] During the preparation process of methanol, a large amount of waste heat, exhaust gas, and tail gas will be lost, resulting in insufficient energy utilization of the methanol preparation system and low overall efficiency of the system. Summary of the invention

[0004] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0005] To this end, an object of the present disclosure is to provide a methanol production system for cogeneration of heat and power.

[0006] To achieve the above-mentioned purpose, the present disclosure provides a methanol preparation system for combined heat and power generation, comprising: a hydrogen production system, wherein the hydrogen production system is used to prepare hydrogen using renewable energy; a methanol synthesis system, wherein the working fluid input end of the methanol synthesis system is connected to the hydrogen output end of the hydrogen production system, and the methanol synthesis system is used to prepare methanol and generate steam, and the steam output end of the methanol synthesis system is connected to the steam input end of a steam consumption system; a gas-fired combined power generation system, wherein the working fluid input end of the gas-fired combined power generation system is connected to the unreacted gas output end of the methanol synthesis system, and the gas-fired combined power generation system is used to generate electricity and generate steam, and the power output end of the gas-fired combined power generation system is respectively connected to the power input ends of the hydrogen production system and the power consumption system, and the exhaust steam output end of the gas-fired combined power generation system is connected to the steam input end of the steam consumption system.

[0007] Optionally, the methanol synthesis system includes: a synthesis gas compression device, wherein the working fluid input end of the synthesis gas compression device is connected to the oxygen output end of the hydrogen production system, and the synthesis gas compression device is used to prepare a synthesis gas having a first preset pressure, wherein the synthesis gas includes: carbon monoxide and hydrogen; a hydrogen compression device, wherein the working fluid input end of the hydrogen compression device is connected to the hydrogen output end of the hydrogen production system, and the hydrogen compression device is used to prepare hydrogen having a second preset pressure; a methanol generation device, wherein the working fluid input end of the methanol generation device is respectively connected to the synthesis gas output end of the synthesis gas compression device and the hydrogen output end of the hydrogen compression device, and the methanol generation device is used to prepare methanol and generate steam, and the unreacted gas output end of the methanol generation device is respectively connected to the working fluid input end of the gas-fired combined power generation system and the working fluid input end of the synthesis gas compression device, and the steam output end of the methanol generation device is connected to the steam input end of the steam use system, wherein the unreacted gas includes: carbon monoxide and hydrogen.

[0008] Optionally, the synthesis gas compression device includes: a biomass gasifier and a first compressor, the first working fluid input end of the biomass gasifier is connected to the oxygen output end of the hydrogen production system, and the second working fluid input end of the biomass gasifier is introduced into the biomass raw material, the biomass gasifier is used to prepare synthesis gas using the oxygen and the biomass raw material, the working fluid input end of the first compressor is respectively connected to the synthesis gas output end of the biomass gasifier and the unreacted gas output end of the methanol generation device, and the synthesis gas output end of the first compressor is connected to the working fluid input end of the methanol generation device, and the first compressor is used to compress the synthesis gas according to the first preset pressure.

[0009] Optionally, the hydrogen compression device includes: a second compressor, the working fluid input end of the second compressor is connected to the hydrogen output end of the hydrogen production system, and the hydrogen output end of the second compressor is connected to the working fluid input end of the methanol production device, and the second compressor is used to compress the hydrogen according to the second preset pressure.

[0010] Optionally, the methanol production device includes: a methanol synthesis tower, wherein a first working fluid input end of the methanol synthesis tower is connected to a synthesis gas output end of the synthesis gas compression device, and a second working fluid input end of the methanol synthesis tower is connected to a hydrogen output end of the hydrogen compression device, and pure water is introduced into a third working fluid input end of the methanol synthesis tower, and the methanol synthesis tower is used to prepare a methanol mixed gas and generate steam using the synthesis gas, the hydrogen and the pure water, and the steam output end of the methanol synthesis tower is connected to a steam input end of a steam using system; a gas-liquid separator, wherein a working fluid input end of the gas-liquid separator is connected to the The mixed gas output end of the methanol synthesis tower is connected, and the gas-liquid separator is used to separate liquid crude methanol from the methanol mixed gas and generate the unreacted gas, and the unreacted gas output end of the gas-liquid separator is respectively connected to the working fluid input end of the gas-fired combined power generation system and the working fluid input end of the synthesis gas compression device; a methanol distillation tower, the working fluid input end of the methanol distillation tower is connected to the methanol output end of the gas-liquid separator, and the methanol distillation tower is used to distill the liquid crude methanol; a methanol storage tank, the working fluid input end of the methanol storage tank is connected to the methanol output end of the methanol distillation tower.

[0011] Optionally, the methanol synthesis system also includes: a first valve body and a second valve body, the first valve body being arranged between the unreacted gas output end of the methanol generation device and the working fluid input end of the gas-fired combined power generation system, and the second valve body being arranged between the unreacted gas output end of the methanol generation device and the working fluid input end of the synthesis gas compression device; wherein the preparation system is used to control the opening of the first valve body and the second valve body according to the power supply and demand relationship, so as to adjust the distribution ratio of the unreacted gas between the gas-fired combined power generation system and the synthesis gas compression device.

[0012] Optionally, the hydrogen production system includes: a renewable energy generator set, which generates electricity using renewable energy; a water electrolysis hydrogen production device, wherein the power input end of the water electrolysis hydrogen production device is respectively connected to the power output end of the renewable energy generator set and the gas combined power generation system, and the working fluid input end of the water electrolysis hydrogen production device is connected to the hydrogen production liquid, and the water electrolysis hydrogen production device is used to electrolyze the hydrogen production liquid to obtain oxygen and hydrogen; an oxygen tank, wherein the working fluid input end of the oxygen tank is connected to the oxygen output end of the water electrolysis hydrogen production device, and the working fluid output end of the oxygen tank is connected to the working fluid input end of the synthesis gas compression device; and a hydrogen tank, wherein the working fluid input end of the hydrogen tank is connected to the hydrogen output end of the water electrolysis hydrogen production device, and the working fluid output end of the hydrogen tank is connected to the working fluid input end of the hydrogen compression device.

[0013] Optionally, the hydrogen production system also includes: an energy storage device, wherein the power input end of the energy storage device is respectively connected to the power output ends of the renewable energy generator set and the gas-fired combined power generation system, and the power output end of the energy storage device is connected to the power input end of the water electrolysis hydrogen production device; a rectifier device, wherein the power input end of the rectifier device is respectively connected to the power output ends of the renewable energy generator set and the gas-fired combined power generation system, and the power output end of the rectifier device is connected to the power input end of the water electrolysis hydrogen production device; wherein the preparation system is used to control the on-off of the passage between the energy storage device and the water electrolysis hydrogen production device and the on-off of the passage between the rectifier device and the water electrolysis hydrogen production device according to the power supply and demand relationship; the preparation system is also used to control the distribution ratio of electric energy in the gas-fired combined power generation system between the energy storage device, the rectifier device and the power consumption system according to the power supply and demand relationship.

[0014] Optionally, the gas-fired combined power generation system includes: a gas turbine, wherein the working fluid input end of the gas turbine is connected to the unreacted gas output end of the methanol synthesis system, and the gas turbine is used to generate electricity using the unreacted gas, and the power output end of the gas turbine is respectively connected to the power input ends of the hydrogen production system and the power consumption system; a waste heat boiler, wherein the first working fluid input end of the waste heat boiler is connected to the exhaust steam output end of the gas turbine, and pure water is introduced into the second working fluid input end of the waste heat boiler, and the waste heat boiler is used to generate steam from the pure water using the exhaust steam of the gas turbine; a steam turbine, wherein the working fluid input end of the steam turbine is connected to the steam output end of the waste heat boiler, and the steam turbine is used to generate electricity using the steam, and the power output end of the steam turbine is respectively connected to the power input ends of the hydrogen production system and the power consumption system, and the exhaust steam output end of the steam turbine is connected to the steam input end of the steam consumption system.

[0015] Optionally, the steam system includes: industrial steam equipment and domestic heating equipment, the steam output end of the methanol synthesis system is respectively connected to the steam input end of the industrial steam equipment and the domestic heating equipment, and the steam output end of the gas-fired combined power generation system is respectively connected to the steam input end of the industrial steam equipment and the domestic heating equipment.

[0016] The technical solution provided by the present disclosure may have the following beneficial effects:

[0017] Since the steam output end of the methanol synthesis system is connected to the steam input end of the steam consumption system, the methanol synthesis system can supply the synchronously generated steam to the steam consumption system while preparing methanol, which can not only reduce the energy loss in the methanol preparation process, but also realize the reuse of steam; since the working fluid input end of the gas-fired combined power generation system is connected to the unreacted gas output end of the methanol synthesis system, and the power output end of the gas-fired combined power generation system is respectively connected to the power input end of the hydrogen production system and the power consumption system, the gas-fired combined power generation system can use the unreacted gas in the methanol synthesis system to generate electricity, and supply the generated electric energy to the hydrogen production system and the power consumption system, which can not only reduce the energy loss in the methanol preparation process, but also realize power supply by using the unreacted gas; since the exhaust steam output end of the gas-fired combined power generation system is connected to the steam input end of the steam consumption system, the gas-fired combined power generation system can supply the generated exhaust steam to the steam consumption system while generating electricity, which can not only reduce the energy loss in the power generation process, but also realize the reuse of exhaust steam. Therefore, through the cooperation of the hydrogen production system, the methanol synthesis system and the gas-fired combined power generation system, the steam and unsynthesized gas in the methanol preparation process are utilized to realize the energy ladder and full utilization of the system, thereby effectively improving the overall efficiency of the system.

[0018] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present disclosure will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0020] Figure 1 It is a structural schematic diagram of a methanol production system for combined heat and power generation proposed in one embodiment of the present disclosure;

[0021] As shown in the figure: 1. Hydrogen production system, 11. Renewable energy generator set, 12. Energy storage device, 13. Rectifier, 14. Water electrolysis hydrogen production device, 15. Oxygen tank, 16. Hydrogen tank;

[0022] 2. Methanol synthesis system, 21. Biomass gasifier, 22. First compressor, 23. Second compressor, 24. Methanol synthesis tower, 25. Gas-liquid separator, 26. Methanol distillation tower, 27. Methanol storage tank, 28. First valve body, 29. Second valve body, 210. Pure water tank;

[0023] 3. Gas-fired combined power generation system, 31. Gas turbine, 32. Waste heat boiler, 33. Steam turbine;

[0024] 100. Steam system;

[0025] 200. Power system. DETAILED DESCRIPTION

[0026] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present disclosure, and are not to be construed as limitations of the present disclosure. On the contrary, the embodiments of the present disclosure include all changes, modifications, and equivalents that fall within the spirit and connotation of the appended claims.

[0027] like Figure 1 As shown, the embodiment of the present disclosure proposes a methanol preparation system for combined heat and power generation, including: a hydrogen production system 1, a methanol synthesis system 2 and a gas-fired combined power generation system 3, the hydrogen production system 1 is used to prepare hydrogen using renewable energy, the working fluid input end of the methanol synthesis system 2 is connected to the hydrogen output end of the hydrogen production system 1, and the methanol synthesis system 2 is used to prepare methanol and generate steam, the steam output end of the methanol synthesis system 2 is connected to the steam input end of the steam consumption system 100, the working fluid input end of the gas-fired combined power generation system 3 is connected to the unreacted gas output end of the methanol synthesis system 2, and the gas-fired combined power generation system 3 is used to generate electricity and generate steam, the power output end of the gas-fired combined power generation system 3 is respectively connected to the power input ends of the hydrogen production system 1 and the power consumption system 200, and the exhaust steam output end of the gas-fired combined power generation system 3 is connected to the steam input end of the steam consumption system 100.

[0028] It can be understood that since the working fluid input end of the methanol synthesis system 2 is connected to the hydrogen output end of the hydrogen production system 1, the hydrogen produced by the hydrogen production system 1 using renewable energy can be supplied to the methanol synthesis system 2, so that the methanol synthesis system 2 can use hydrogen to produce methanol, thereby meeting the demand for methanol use. In addition, while producing methanol, the methanol synthesis system 2 will also produce additional steam and unreacted gas.

[0029] Since the steam output end of the methanol synthesis system 2 is connected to the steam input end of the steam-using system 100, the methanol synthesis system 2 can supply the synchronously generated steam to the steam-using system 100 while preparing methanol, which not only reduces the energy loss in the methanol preparation process, but also realizes the reuse of steam; since the working fluid input end of the gas-fired combined power generation system 3 is connected to the unreacted gas output end of the methanol synthesis system 2, and the power output end of the gas-fired combined power generation system 3 is respectively connected to the power input ends of the hydrogen production system 1 and the power consumption system 200, the gas-fired combined power generation system 3 can use the unreacted gas in the methanol synthesis system 2 to generate electricity, and supply the generated electric energy to the hydrogen production system 1 and the power consumption system 200, which not only reduces the energy loss in the methanol preparation process, but also realizes power supply using the unreacted gas; since the exhaust steam output end of the gas-fired combined power generation system 3 is connected to the steam input end of the steam-using system 100, the gas-fired combined power generation system 3 can supply the generated exhaust steam to the steam-using system 100 while generating electricity, which not only reduces the energy loss in the power generation process, but also realizes the reuse of exhaust steam.

[0030] Therefore, through the cooperation of the hydrogen production system 1, the methanol synthesis system 2 and the gas-fired combined power generation system 3, the steam and unsynthesized gas in the methanol preparation process are utilized to achieve the energy cascade and full utilization of the system, thereby effectively improving the overall efficiency of the system.

[0031] It should be noted that the hydrogen production system 1 is used to produce hydrogen using renewable energy, so as to produce methanol using hydrogen. The specific type of the hydrogen production system 1 can be set according to actual needs and is not limited to this.

[0032] The methanol synthesis system 2 is used to prepare methanol using raw materials such as hydrogen, and while preparing methanol, it also produces unsynthesized gas, steam, etc. The unsynthesized gas is used to generate electricity and supply steam using the gas-fired combined power generation system 3. The specific type of the methanol synthesis system 2 can be set according to actual needs and is not limited to this.

[0033] The gas-fired combined power generation system 3 is used to generate electricity using the unsynthesized gas in the methanol synthesis system 2, and also generates exhaust steam while generating electricity. The electrical energy can be supplied to the hydrogen production system 1 in the system and the external power consumption system 200, and the steam can be supplied to the external steam consumption system 100. The specific type of the gas-fired combined power generation system 3 can be set according to actual needs and is not limited to this.

[0034] In some embodiments, the methanol synthesis system 2 includes: a synthesis gas compression device, a hydrogen compression device and a methanol generation device, the working fluid input end of the synthesis gas compression device is connected to the oxygen output end of the hydrogen production system 1, and the synthesis gas compression device is used to prepare a synthesis gas with a first preset pressure, wherein the synthesis gas includes: carbon monoxide and hydrogen, the working fluid input end of the hydrogen compression device is connected to the hydrogen output end of the hydrogen production system 1, and the hydrogen compression device is used to prepare hydrogen with a second preset pressure, the working fluid input end of the methanol generation device is respectively connected to the synthesis gas output end of the synthesis gas compression device and the hydrogen output end of the hydrogen compression device, and the methanol generation device is used to prepare methanol and generate steam, the unreacted gas output end of the methanol generation device is respectively connected to the working fluid input end of the gas-fired combined power generation system 3 and the working fluid input end of the synthesis gas compression device, the steam output end of the methanol generation device is connected to the steam input end of the steam use system 100, wherein the unreacted gas includes: carbon monoxide and hydrogen.

[0035] It can be understood that, since the working fluid input end of the synthesis gas compression device is connected to the oxygen output end of the hydrogen production system 1, the synthesis gas compression device can use the oxygen provided by the hydrogen production system 1 to prepare synthesis gas with a first preset pressure; since the working fluid input end of the hydrogen compression device is connected to the hydrogen output end of the hydrogen production system 1, the hydrogen compression device can use the hydrogen provided by the hydrogen production system 1 to prepare hydrogen with a second preset pressure; since the working fluid input end of the methanol generation device is respectively connected to the synthesis gas output end of the synthesis gas compression device and the hydrogen output end of the hydrogen compression device, the methanol generation device can use the synthesis gas with a first preset pressure provided by the synthesis gas compression device and the hydrogen with a second preset pressure provided by the hydrogen compression device to prepare methanol, thereby meeting the use demand of methanol, and the methanol generation device will also produce additional steam and unreacted gas while preparing methanol.

[0036] At the same time, since the unreacted gas output end of the methanol generation device is connected to the working fluid input end of the gas-fired combined power generation system 3 and the working fluid input end of the synthesis gas compression device, part of the unreacted gas of the methanol generation device can be returned to the synthesis gas compression device, thereby continuing to participate in the synthesis reaction of methanol, and the remaining unreacted gas can enter the gas-fired combined power generation system 3, thereby utilizing the gas-fired combined power generation system 3 for power generation and steam supply; since the steam output end of the methanol generation device is connected to the steam input end of the steam-using system 100, the methanol generation device can supply the synchronously generated steam to the steam-using system 100 while preparing methanol. Thus, the energy ladder and full utilization of the system are realized, thereby effectively improving the overall efficiency of the system.

[0037] It should be noted that the synthesis gas compression device is used to prepare synthesis gas with a first preset pressure using oxygen, and the specific type of the synthesis gas compression device can be set according to actual needs and is not limited to this.

[0038] The hydrogen compression device is used to prepare hydrogen with a second preset pressure using hydrogen. The specific type of the hydrogen compression device can be set according to actual needs and is not limited to this.

[0039] The methanol production device is used to prepare methanol using synthesis gas with a first preset pressure and hydrogen with a second preset pressure. The specific type of the methanol production device can be set according to actual needs and is not limited to this.

[0040] like Figure 1 As shown, in some embodiments, the synthesis gas compression device includes: a biomass gasifier 21 and a first compressor 22, the first working fluid input end of the biomass gasifier 21 is connected to the oxygen output end of the hydrogen production system 1, and the second working fluid input end of the biomass gasifier 21 is introduced into the biomass raw material, the biomass gasifier 21 is used to prepare synthesis gas using oxygen and biomass raw materials, the working fluid input end of the first compressor 22 is respectively connected to the synthesis gas output end of the biomass gasifier 21 and the unreacted gas output end of the methanol generation device, and the synthesis gas output end of the first compressor 22 is connected to the working fluid input end of the methanol generation device, and the first compressor 22 is used to compress the synthesis gas according to a first preset pressure.

[0041] It can be understood that, since the first working fluid input end of the biomass gasifier 21 is connected to the oxygen output end of the hydrogen production system 1, and the biomass raw material is introduced into the second working fluid input end of the biomass gasifier 21, the biomass gasifier 21 can prepare synthesis gas using the biomass raw material and the oxygen provided by the hydrogen production system 1; and, since the working fluid input end of the first compressor 22 is respectively connected to the synthesis gas output end of the biomass gasifier 21 and the unreacted gas output end of the methanol production device, and the synthesis gas output end of the first compressor 22 is connected to the working fluid input end of the methanol production device, the first compressor 22 can compress the synthesis gas prepared by the biomass gasifier 21 and the unreacted gas in the methanol production device, thereby providing the methanol production device with synthesis gas having a first preset pressure, thereby ensuring the stable preparation of methanol.

[0042] It should be noted that the biomass gasifier 21 is a device for producing fuel gas. Specifically, the biomass gasifier 21 uses the high temperature and low pressure of steam to significantly reduce the tar content of organic matter, gasify the biomass, save a lot of heat in the traditional combustion process, and directly gasify the low calorific value organic pollutants, thereby improving the fuel utilization rate and the thermal efficiency, thereby obtaining a higher thermal efficiency. The specific type of the biomass gasifier 21 can be set according to actual needs, and there is no restriction on this. Among them, the synthesis gas prepared by the biomass gasifier 21 includes not only carbon monoxide and hydrogen, but also a small amount of carbon dioxide and methane.

[0043] The first compressor 22 is used to compress the synthesis gas according to the first preset pressure. The specific type of the first compressor 22 can be set according to actual needs and is not limited to this.

[0044] like Figure 1 As shown, in some embodiments, the hydrogen compression device includes: a second compressor 23, the working fluid input end of the second compressor 23 is connected to the hydrogen output end of the hydrogen production system 1, and the hydrogen output end of the second compressor 23 is connected to the working fluid input end of the methanol production device, and the second compressor 23 is used to compress hydrogen according to a second preset pressure.

[0045] It can be understood that since the working fluid input end of the second compressor is connected to the hydrogen output end of the hydrogen production system 1, and the hydrogen output end of the second compressor 23 is connected to the working fluid input end of the methanol production device, the second compressor 23 can compress the hydrogen provided by the hydrogen production system 1, thereby providing hydrogen with a second preset pressure to the methanol production device, thereby ensuring the stable preparation of methanol.

[0046] It should be noted that the second compressor 23 is used to compress the hydrogen according to the second preset pressure. The specific type of the second compressor 23 can be set according to actual needs and is not limited to this.

[0047] like Figure 1 As shown, in some embodiments, the methanol production device includes: a methanol synthesis tower 24, a gas-liquid separator 25, a methanol distillation tower 26 and a methanol storage tank 27, the first working fluid input end of the methanol synthesis tower 24 is connected to the synthesis gas output end of the synthesis gas compression device, and the second working fluid input end of the methanol synthesis tower 24 is connected to the hydrogen output end of the hydrogen compression device, and pure water is introduced into the third working fluid input end of the methanol synthesis tower 24. The methanol synthesis tower 24 is used to prepare a methanol mixed gas and generate steam using synthesis gas, hydrogen and pure water, and the steam output end of the methanol synthesis tower 24 is connected to the steam input end of the steam using system 100. The working fluid input end of the gas-liquid separator 25 is connected to the mixed gas output end of the methanol synthesis tower 24, and the gas-liquid separator 25 is used to separate liquid crude methanol from the methanol mixed gas and generate unreacted gas, the unreacted gas output end of the gas-liquid separator 25 is respectively connected to the working fluid input end of the gas-fired combined power generation system 3 and the working fluid input end of the synthesis gas compression device, the working fluid input end of the methanol distillation tower 26 is connected to the methanol output end of the gas-liquid separator 25, and the methanol distillation tower 26 is used to distill liquid crude methanol, and the working fluid input end of the methanol storage tank 27 is connected to the methanol output end of the methanol distillation tower 26.

[0048] It can be understood that, since the first working fluid input end of the methanol synthesis tower 24 is connected to the synthesis gas output end of the synthesis gas compression device, and the second working fluid input end of the methanol synthesis tower 24 is connected to the hydrogen output end of the hydrogen compression device, pure water is introduced into the third working fluid input end of the methanol synthesis tower 24, so that the methanol synthesis tower 24 can use pure water, the synthesis gas of the first preset pressure provided by the synthesis gas compression device, and the hydrogen of the second preset pressure provided by the hydrogen compression device to prepare a methanol mixed gas; and, since the working fluid input end of the gas-liquid separator 25 The end of the methanol distillation tower 26 is connected to the mixed gas output end of the methanol synthesis tower 24, so that the gas-liquid separator 25 can separate the liquid crude methanol from the methanol mixed gas prepared by the methanol synthesis tower 24; at the same time, since the working fluid input end of the methanol rectification tower 26 is connected to the methanol output end of the gas-liquid separator 25, and the working fluid input end of the methanol storage tank 27 is connected to the methanol output end of the methanol rectification tower 26, the methanol rectification tower 26 can rectify the liquid crude methanol separated by the gas-liquid separator 25, and can store the rectified liquid methanol in the methanol storage tank 27. In this way, efficient and stable preparation of methanol is achieved, and the use demand of methanol is met.

[0049] Among them, since the steam output end of the methanol synthesis tower 24 is connected to the steam input end of the steam consumption system 100, the methanol synthesis tower 24 can supply the synchronously generated steam to the steam consumption system 100 while preparing the methanol mixed gas; since the unreacted gas output end of the gas-liquid separator 25 is respectively connected to the working fluid input end of the gas-fired combined power generation system 3 and the working fluid input end of the synthesis gas compression device, part of the unreacted gas of the gas-liquid separator 25 can be returned to the synthesis gas compression device, thereby continuing to participate in the synthesis reaction of methanol, and the remaining unreacted gas can enter the gas-fired combined power generation system 3, thereby using the gas-fired combined power generation system 3 to generate electricity and supply steam. In this way, the energy ladder and full utilization of the system are realized, thereby effectively improving the overall efficiency of the system.

[0050] It should be noted that the methanol synthesis tower 24 is used to prepare a methanol mixed gas using pure water, a synthesis gas of a first preset pressure provided by a synthesis gas compression device, and hydrogen of a second preset pressure provided by a hydrogen compression device, and steam is generated simultaneously while preparing the methanol mixed gas. The specific type of the methanol synthesis tower 24 can be set according to actual needs and there is no limitation on this.

[0051] Among them, the pure water in the methanol synthesis tower 24 comes from the pure water tank 210. Specifically, the pure water in the pure water tank 210 is transported to the methanol synthesis tower 24 by a pump body, and a steam bag is formed on the shell side of the methanol synthesis tower 24. The synthesis temperature (the temperature range can be 200°C-400°C) and the steam pressure (the pressure range can be 3MPa-30MPa) are controlled by adjusting the steam pressure. In addition, a catalytic particle layer is built into the methanol synthesis tower 24, and the catalyst can be a copper-based catalyst (for example: copper, zinc, chromium, etc.). The synthesis gas and hydrogen contact the catalyst, and a synthesis reaction occurs at a certain temperature and pressure, and a methanol mixed gas is generated and enters the gas-liquid separator 25, and the methanol synthesis heat enters the steam main pipe of the steam system 100 through the steam for waste heat utilization.

[0052] The gas-liquid separator 25 is used to separate liquid crude methanol from the methanol mixed gas, and simultaneously generate unreacted gas while separating the liquid crude methanol. The specific type of the liquid crude methanol can be set according to actual needs and is not limited to this.

[0053] The methanol distillation tower 26 is used to distill liquid crude methanol. The specific type of the methanol distillation tower 26 can be set according to actual needs and is not limited to this.

[0054] The methanol storage tank 27 is used to store liquid methanol after distillation. The specific type of the methanol storage tank 27 can be set according to actual needs and is not limited to this.

[0055] like Figure 1 As shown, in some embodiments, the methanol synthesis system 2 further includes: a first valve body 28 and a second valve body 29, the first valve body 28 is arranged between the unreacted gas output end of the methanol generation device and the working fluid input end of the gas-fired combined power generation system 3, and the second valve body 29 is arranged between the unreacted gas output end of the methanol generation device and the working fluid input end of the synthesis gas compression device. The preparation system is used to control the opening of the first valve body 28 and the second valve body 29 according to the power supply and demand relationship to adjust the distribution ratio of the unreacted gas between the gas-fired combined power generation system 3 and the synthesis gas compression device.

[0056] It can be understood that since the first valve body 28 is arranged between the unreacted gas output end of the methanol generation device and the working fluid input end of the gas-fired combined power generation system 3, the first valve body 28 can control the on-off and opening degree of the passage between the unreacted gas output end of the methanol generation device and the working fluid input end of the gas-fired combined power generation system 3; since the second valve body 29 is arranged between the unreacted gas output end of the methanol generation device and the working fluid input end of the synthesis gas compression device, the second valve body 29 can control the on-off and opening degree of the passage between the unreacted gas output end of the methanol generation device and the working fluid input end of the synthesis gas compression device.

[0057] In addition, the preparation system controls the opening of the first valve body 28 and the second valve body 29 according to the power supply and demand relationship to adjust the distribution ratio of the unreacted gas between the gas-fired combined power generation system 3 and the synthesis gas compression device, thereby meeting different methanol preparation needs and power generation needs, thereby making the system operation more flexible and reliable.

[0058] It should be noted that the first valve body 28 is used to control the on-off and opening degree of the passage between the unreacted gas output end of the methanol production device and the working fluid input end of the gas-fired combined power generation system 3. The specific type of the first valve body 28 can be set according to actual needs and is not limited to this.

[0059] The second valve body 29 is used to control the connection and opening degree of the passage between the unreacted gas output end of the methanol production device and the working fluid input end of the synthesis gas compression device. The specific type of the second valve body 29 can be set according to actual needs and is not limited to this.

[0060] Among them, the preparation system regulates the energy and material of the entire system according to the real-time power supply and demand relationship measured in the local area network and the predicted value of the renewable energy generator set 11. Specifically, the preparation system controls the opening ratio of the first valve body 28 and the second valve body 29.

[0061] like Figure 1 As shown, in some embodiments, the hydrogen production system 1 includes: a renewable energy generator set 11, a water electrolysis hydrogen production device 14, an oxygen tank 15 and a hydrogen tank 16. The renewable energy generator set 11 generates electricity using renewable energy. The power input end of the water electrolysis hydrogen production device 14 is connected to the power output end of the renewable energy generator set 11 and the gas combined power generation system 3 respectively, and the working fluid input end of the water electrolysis hydrogen production device 14 is introduced into the hydrogen production liquid. The water electrolysis hydrogen production device 14 is used to electrolyze the hydrogen production liquid to obtain oxygen and hydrogen. The working fluid input end of the oxygen tank 15 is connected to the oxygen output end of the water electrolysis hydrogen production device 14, and the working fluid output end of the oxygen tank 15 is connected to the working fluid input end of the synthesis gas compression device, the working fluid input end of the hydrogen tank 16 is connected to the hydrogen output end of the water electrolysis hydrogen production device 14, and the working fluid output end of the hydrogen tank 16 is connected to the working fluid input end of the hydrogen compression device.

[0062] It can be understood that, since the power input end of the water electrolysis hydrogen production device 14 is connected to the power output end of the renewable energy generator set 11 and the gas-fired combined power generation system 3, respectively, and the working fluid input end of the water electrolysis hydrogen production device 14 is connected to the hydrogen production liquid, the water electrolysis hydrogen production device 14 can use the power provided by the renewable energy generator set 11 and the power provided by the gas-fired combined power generation system 3 to electrolyze the hydrogen production liquid, thereby obtaining oxygen and hydrogen; since the working fluid input end of the oxygen tank 15 and the oxygen output end of the water electrolysis hydrogen production device 14 are connected to the working fluid input end of the oxygen tank 15 and the oxygen output end of the water electrolysis hydrogen production device 14, the working fluid input end of the oxygen tank 15 and the oxygen output end of the water electrolysis hydrogen production device 14 are connected to the working fluid input end of the oxygen tank 15 and the oxygen output end of the water electrolysis hydrogen production device 14. The working fluid output end of the oxygen tank 15 is connected to the working fluid input end of the synthesis gas compression device, so that the oxygen tank 15 can store the oxygen produced by the water electrolysis hydrogen production device 14, and supply oxygen to the synthesis gas compression device; because the working fluid input end of the hydrogen tank 16 is connected to the hydrogen output end of the water electrolysis hydrogen production device 14, and the working fluid output end of the hydrogen tank 16 is connected to the working fluid input end of the hydrogen compression device, the hydrogen tank 16 can store the hydrogen produced by the water electrolysis hydrogen production device 14, and supply hydrogen to the hydrogen compression device.

[0063] It should be noted that the renewable energy generator set 11 is used to generate electricity using renewable energy, and the renewable energy may be wind power, photovoltaic power, etc., without limitation.

[0064] The water electrolysis hydrogen production device 14 is used to electrolyze hydrogen production liquid to obtain oxygen and hydrogen. The hydrogen production liquid can be pure water, alkaline solution, etc. The specific type of the water electrolysis hydrogen production device 14 can be set according to actual needs and is not limited to this. Among them, the water electrolysis hydrogen production device 14 can choose PEM hydrogen production (proton exchange membrane water electrolysis hydrogen production) or alkaline hydrogen production technology.

[0065] The oxygen tank 15 is used to store the oxygen produced by the water electrolysis hydrogen production device 14 and to supply oxygen to the synthesis gas compression device. The specific type of the oxygen tank 15 can be set according to actual needs and is not limited to this. The oxygen produced by the water electrolysis hydrogen production device 14 enters the oxygen tank 15 after being purified and dried.

[0066] The hydrogen tank 16 is used to store the hydrogen produced by the water electrolysis hydrogen production device 14 and to supply hydrogen to the hydrogen compression device. The specific type of the hydrogen tank 16 can be set according to actual needs and is not limited thereto. The hydrogen produced by the water electrolysis hydrogen production device 14 enters the hydrogen tank 16 after being purified and dried.

[0067] like Figure 1As shown, in some embodiments, the hydrogen production system 1 further includes: an energy storage device 12 and a rectifier 13, the power input end of the energy storage device 12 is connected to the power output end of the renewable energy generator set 11 and the gas combined power generation system 3, and the power output end of the energy storage device 12 is connected to the power input end of the water electrolysis hydrogen production device 14, the power input end of the rectifier 13 is connected to the power output end of the renewable energy generator set 11 and the gas combined power generation system 3, and the power output end of the rectifier 13 is connected to the power input end of the water electrolysis hydrogen production device 14. Among them, the preparation system is used to control the opening and closing of the passage between the energy storage device 12 and the water electrolysis hydrogen production device 14 and the opening and closing of the passage between the rectifier 13 and the water electrolysis hydrogen production device 14 according to the power supply and demand relationship; the preparation system is also used to control the distribution ratio of electric energy in the gas combined power generation system 3 between the energy storage device 12, the rectifier 13 and the power system 200 according to the power supply and demand relationship.

[0068] It can be understood that since the power input end of the energy storage device 12 is respectively connected to the power output ends of the renewable energy generator set 11 and the gas-fired combined power generation system 3, and the power output end of the energy storage device 12 is connected to the power input end of the water electrolysis hydrogen production device 14, the energy storage device 12 can store the electric energy from the renewable energy generator set 11 and the electric energy from the gas-fired combined power generation system 3, and can use the stored electric energy to power the water electrolysis hydrogen production device 14; since the power input end of the rectifier 13 is respectively connected to the power output end of the renewable energy generator set 11 and the gas-fired combined power generation system 3, and the power output end of the rectifier 13 is connected to the power input end of the water electrolysis hydrogen production device 14, the rectifier 13 can rectify and filter the electric energy provided by the renewable energy generator set 11 and the electric energy provided by the gas-fired combined power generation system 3, and supply the rectified and filtered electric energy to the water electrolysis hydrogen production device 14.

[0069] In addition, the preparation system controls the on-off of the passage between the energy storage device 12 and the water electrolysis hydrogen production device 14 and the on-off of the passage between the rectifier 13 and the water electrolysis hydrogen production device 14 according to the power supply and demand relationship, thereby enabling switching between the passage between the energy storage device 12 and the water electrolysis hydrogen production device 14 and the passage between the rectifier 13 and the water electrolysis hydrogen production device 14, thereby enabling flexible and reliable operation of the system.

[0070] The preparation system controls the distribution ratio of electric energy in the gas-fired combined power generation system 3 among the energy storage device 12, the rectifier device 13 and the power consumption system 200 according to the power supply and demand relationship, thereby realizing the distribution of electric energy and further realizing flexible and reliable operation of the system.

[0071] It should be noted that the energy storage device 12 is used to store the electric energy from the renewable energy generator set 11 and the electric energy from the gas combined power generation system 3. The specific type of the energy storage device 12 can be set according to actual needs and is not limited to this.

[0072] The rectifier 13 is used to rectify and filter the electric energy provided by the renewable energy generator set 11 and the electric energy provided by the gas combined power generation system 3. The specific type of the rectifier 13 can be set according to actual needs and is not limited to this.

[0073] Among them, renewable energy power generation is unstable, volatile and intermittent. The preparation system adjusts part of the power of the renewable energy generator set 11 according to the real-time supply and demand relationship of local area network power, and filters it through the rectifier device 13 to supply power to the water electrolysis hydrogen production device 14, while the remaining power of the renewable energy generator set 11 supplies power to the energy storage device 12 for energy storage. When the renewable energy generator set 11 is short of power, the energy storage device 12 can supply power to the water electrolysis hydrogen production device 14 to smooth out wind and solar fluctuations and store electricity to ensure continuous power supply of the water electrolysis hydrogen production device 14.

[0074] like Figure 1 As shown, in some embodiments, the gas-fired combined power generation system 3 includes: a gas turbine 31, a waste heat boiler 32 and a steam turbine 33. The working fluid input end of the gas turbine 31 is connected to the unreacted gas output end of the methanol synthesis system 2, and the gas turbine 31 is used to generate electricity using the unreacted gas. The power output end of the gas turbine 31 is respectively connected to the power input ends of the hydrogen production system 1 and the power consumption system 200. The first working fluid input end of the waste heat boiler 32 is connected to the exhaust steam output end of the gas turbine 31, and pure water is introduced into the second working fluid input end of the waste heat boiler 32. The waste heat boiler 32 is used to generate steam from pure water using the exhaust steam of the gas turbine 31. The working fluid input end of the steam turbine 33 is connected to the steam output end of the waste heat boiler 32, and the steam turbine 33 is used to generate electricity using steam. The power output end of the steam turbine 33 is respectively connected to the power input end of the hydrogen production system 1 and the power consumption system 200, and the exhaust steam output end of the steam turbine 33 is connected to the steam input end of the steam consumption system 100.

[0075] It can be understood that, since the working fluid input end of the gas turbine 31 is connected to the unreacted gas output end of the methanol synthesis system 2, and the power output end of the gas turbine 31 is respectively connected to the power input ends of the hydrogen production system 1 and the power system 200, the gas turbine 31 can generate electricity using the unreacted gas in the methanol synthesis system 2, and use the generated electric energy to supply power to the hydrogen production system 1 and the power system 200; since the first working fluid input end of the waste heat boiler 32 is connected to the exhaust steam output end of the gas turbine 31, and pure water is introduced into the second working fluid input end of the waste heat boiler 32, the waste heat boiler 3 2 can use the exhaust steam of the gas turbine 31 to heat pure water into steam; at the same time, since the working medium input end of the steam turbine 33 is connected to the steam output end of the waste heat boiler 32, and the power output end of the steam turbine 33 is respectively connected to the power input ends of the hydrogen production system 1 and the power system 200, the exhaust steam output end of the steam turbine 33 is connected to the steam input end of the steam system 100, so that the steam turbine 33 can use the steam generated by the waste heat boiler 32 to generate electricity, and use the generated electric energy to supply power to the hydrogen production system 1 and the power system 200, and use the generated exhaust steam to supply steam to the steam system 100.

[0076] It should be noted that the gas turbine 31 is used to generate electricity using unreacted gas, and the specific type of the gas turbine 31 can be set according to actual needs and is not limited thereto.

[0077] The waste heat boiler 32 is used to generate steam from pure water using the exhaust steam of the gas turbine 31. The specific type of the waste heat boiler 32 can be set according to actual needs and is not limited thereto.

[0078] The steam turbine 33 is used to generate electricity using steam. The specific type of the steam turbine 33 can be set according to actual needs and is not limited thereto.

[0079] Among them, the preparation system controls the power generation of the gas turbine 31 and the steam turbine 33. Specifically, part of the electricity is supplied to the power system 200 and the real-time electricity consumption of the local area network system; part of the electricity is supplied to the energy storage device 12 for storing electricity, which is used to adjust the power supply fluctuations of the renewable energy generator set 11. When the renewable energy generator set 11 is short of power (predicted value), it is supplemented by the energy storage device 12.

[0080] In some embodiments, the steam system 100 includes: industrial steam equipment and domestic heating equipment, the steam output end of the methanol synthesis system 2 is respectively connected to the steam input end of the industrial steam equipment and the domestic heating equipment, and the steam output end of the gas-fired combined power generation system 3 is respectively connected to the steam input end of the industrial steam equipment and the domestic heating equipment.

[0081] It can be understood that since the steam output end of the methanol synthesis system 2 is respectively connected to the steam input ends of the industrial steam equipment and the domestic heating equipment, the methanol synthesis system 2 can use the synchronously generated steam to supply steam to the industrial steam equipment and heat to the domestic heating equipment while preparing methanol; since the steam output end of the gas-fired combined power generation system 3 is respectively connected to the steam input ends of the industrial steam equipment and the domestic heating equipment, the gas-fired combined power generation system 3 can use the synchronously generated exhaust steam to supply steam to the industrial steam equipment and heat to the domestic heating equipment while generating electricity.

[0082] It should be noted that the steam of the methanol synthesis system 2 and the steam of the gas-fired combined power generation system 3 can be supplied to industrial steam equipment and domestic heating equipment via a steam main pipe.

[0083] The preparation system implemented in this embodiment can solve the problems of narrow load fluctuation range, instability and low efficiency in the preparation of green hydrogen / green methanol by renewable energy power generation, utilize a large amount of waste heat in the methanol synthesis preparation process for heating and steam supply, and utilize the unsynthesized gas of methanol to drive the gas turbine 31 and the steam turbine 33 for cogeneration of heat and power, and the exhaust steam for heating and steam supply, thereby realizing energy cascade and full utilization, and improving the power supply stability of the system, the stability of the local area network power grid, and the overall efficiency of the system.

[0084] In this embodiment, a methanol preparation system is constructed, forming a combined heat and power cycle including a renewable energy generator set 11, a gas turbine 31 and a steam turbine 33, a local area network, loads (hydrogen production, biomass gasification, methanol synthesis, and a power system 200), energy storage, heat supply, and supply of industrial steam, which can ensure stable operation and efficient cascade utilization of energy, and an integrated source-grid-load-storage system and a combined heat and power system.

[0085] In this embodiment, the preparation system includes: renewable energy power generation and hydrogen production, biomass gasification, methanol synthesis, gas turbine 31 and steam turbine 33 combined cycle power generation, energy storage device 12, and energy management and control system (for automatic control of the preparation system). Through the utilization of methanol synthesis heat, gas turbine 31 waste heat utilization, synthesis gas cycle flow distribution, gas turbine 31 and steam combined cycle, steam waste heat utilization, methanol synthesis / power generation / energy storage / heat supply / steam supply, a comprehensive energy system with energy cascade utilization, fuel and steam circulation, methanol synthesis-gas turbine 31 and steam high-efficiency combined cycle, and cogeneration is constructed.

[0086] In this implementation, the energy management and control system is used to adjust the proportion of methanol synthesis, gas turbine 31 power generation, and energy storage (power storage and power generation) according to the real-time power supply and demand relationship measured in the local area network and the predicted value of the renewable energy generator set 11. Under the conditions of intermittent and fluctuating power generation of renewable energy, stable electricity consumption for hydrogen production and methanol synthesis, stability of the local area network power grid, and cascade utilization of energy are achieved, and heat and steam are obtained as by-products.

[0087] Specifically, the energy management and control system monitors and uniformly regulates: the allocation of renewable energy power generation in hydrogen production and energy storage; the flow distribution of biomass synthesis gas circulation, and the proportion of methanol synthesis, gas turbine 31 power generation, and energy storage; regulates the proportion of gas turbine 31 power generation to the local area network and energy storage; regulates the proportion of steam turbine 33 power generation to the local area network and energy storage; within the local area network, when there is a shortage of renewable energy (or when it is predicted that there will be a shortage of renewable energy), regulates the power generation of the energy storage device 12.

[0088] It should be noted that, in the description of the present disclosure, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present disclosure, unless otherwise specified, the meaning of "plurality" is two or more.

[0089] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

[0090] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0091] Although the embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A methanol production system for combined heat and power generation, characterized in that: include: A hydrogen production system, wherein the hydrogen production system is used to produce hydrogen using renewable energy; A methanol synthesis system, wherein the working fluid input end of the methanol synthesis system is connected to the hydrogen output end of the hydrogen production system, and the methanol synthesis system is used to prepare methanol and generate steam, and the steam output end of the methanol synthesis system is connected to the steam input end of the steam use system; A gas-fired combined power generation system, wherein the working fluid input end of the gas-fired combined power generation system is connected to the unreacted gas output end of the methanol synthesis system, and the gas-fired combined power generation system is used to generate electricity and steam, the power output end of the gas-fired combined power generation system is respectively connected to the power input ends of the hydrogen production system and the power consumption system, and the exhaust steam output end of the gas-fired combined power generation system is connected to the steam input end of the steam consumption system.

2. The methanol production system of cogeneration of heat and power according to claim 1, characterized in that: The methanol synthesis system comprises: A synthesis gas compression device, wherein the working medium input end of the synthesis gas compression device is connected to the oxygen output end of the hydrogen production system, and the synthesis gas compression device is used to prepare synthesis gas with a first preset pressure, wherein the synthesis gas includes: carbon monoxide and hydrogen; A hydrogen compression device, wherein the working fluid input end of the hydrogen compression device is connected to the hydrogen output end of the hydrogen production system, and the hydrogen compression device is used to prepare hydrogen with a second preset pressure; A methanol generating device, wherein the working fluid input end of the methanol generating device is respectively connected to the synthesis gas output end of the synthesis gas compression device and the hydrogen output end of the hydrogen compression device, and the methanol generating device is used to prepare methanol and generate steam, the unreacted gas output end of the methanol generating device is respectively connected to the working fluid input end of the gas-fired combined power generation system and the working fluid input end of the synthesis gas compression device, and the steam output end of the methanol generating device is connected to the steam input end of the steam using system, wherein the unreacted gas includes: carbon monoxide and hydrogen.

3. The methanol production system of cogeneration of heat and power according to claim 2, characterized in that: The synthesis gas compression device comprises: A biomass gasifier and a first compressor, wherein the first working fluid input end of the biomass gasifier is connected to the oxygen output end of the hydrogen production system, and the second working fluid input end of the biomass gasifier is fed with biomass raw materials, the biomass gasifier is used to prepare synthesis gas using the oxygen and the biomass raw materials, the working fluid input end of the first compressor is respectively connected to the synthesis gas output end of the biomass gasifier and the unreacted gas output end of the methanol production device, and the synthesis gas output end of the first compressor is connected to the working fluid input end of the methanol production device, and the first compressor is used to compress the synthesis gas according to the first preset pressure.

4. The methanol production system of cogeneration of heat and power according to claim 2, characterized in that: The hydrogen compression device comprises: A second compressor, wherein the working fluid input end of the second compressor is connected to the hydrogen output end of the hydrogen production system, and the hydrogen output end of the second compressor is connected to the working fluid input end of the methanol production device, and the second compressor is used to compress the hydrogen according to the second preset pressure.

5. The methanol production system of cogeneration of heat and power according to claim 2, characterized in that: The methanol production device comprises: A methanol synthesis tower, wherein a first working fluid input end of the methanol synthesis tower is connected to a synthesis gas output end of the synthesis gas compression device, and a second working fluid input end of the methanol synthesis tower is connected to a hydrogen output end of the hydrogen compression device, and pure water is introduced into a third working fluid input end of the methanol synthesis tower. The methanol synthesis tower is used to prepare a methanol mixed gas and generate steam by using the synthesis gas, the hydrogen and the pure water, and the steam output end of the methanol synthesis tower is connected to a steam input end of a steam-using system; A gas-liquid separator, wherein the working fluid input end of the gas-liquid separator is connected to the mixed gas output end of the methanol synthesis tower, and the gas-liquid separator is used to separate liquid crude methanol from the methanol mixed gas and generate the unreacted gas, and the unreacted gas output end of the gas-liquid separator is respectively connected to the working fluid input end of the gas-fired combined power generation system and the working fluid input end of the synthesis gas compression device; A methanol distillation tower, wherein the working fluid input end of the methanol distillation tower is connected to the methanol output end of the gas-liquid separator, and the methanol distillation tower is used to distill the liquid crude methanol; A methanol storage tank, wherein the working fluid input end of the methanol storage tank is connected to the methanol output end of the methanol distillation tower.

6. The methanol production system of cogeneration of heat and power according to claim 2, characterized in that: The methanol synthesis system further comprises: a first valve body and a second valve body, wherein the first valve body is arranged between the unreacted gas output end of the methanol generation device and the working medium input end of the gas-fired combined power generation system, and the second valve body is arranged between the unreacted gas output end of the methanol generation device and the working medium input end of the synthesis gas compression device; The preparation system is used to control the opening of the first valve body and the second valve body according to the power supply and demand relationship to adjust the distribution ratio of the unreacted gas between the gas-fired combined power generation system and the synthesis gas compression device.

7. The methanol production system of cogeneration of heat and power according to claim 2, characterized in that: The hydrogen production system comprises: A renewable energy generator set, wherein the renewable energy generator set generates electricity using renewable energy; A water electrolysis hydrogen production device, wherein the power input end of the water electrolysis hydrogen production device is respectively connected to the power output end of the renewable energy power generation unit and the gas combined power generation system, and the working fluid input end of the water electrolysis hydrogen production device is connected to the hydrogen production liquid, and the water electrolysis hydrogen production device is used to electrolyze the hydrogen production liquid to obtain oxygen and hydrogen; An oxygen tank, wherein a working fluid input end of the oxygen tank is connected to an oxygen output end of the water electrolysis hydrogen production device, and a working fluid output end of the oxygen tank is connected to a working fluid input end of the synthesis gas compression device; A hydrogen tank, wherein the working fluid input end of the hydrogen tank is connected to the hydrogen output end of the water electrolysis hydrogen production device, and the working fluid output end of the hydrogen tank is connected to the working fluid input end of the hydrogen compression device.

8. The methanol production system of combined heat and power according to claim 7, characterized in that: The hydrogen production system further comprises: An energy storage device, wherein the power input end of the energy storage device is connected to the power output end of the renewable energy power generation unit and the gas-fired combined power generation system, respectively, and the power output end of the energy storage device is connected to the power input end of the water electrolysis hydrogen production device; A rectifier, wherein the power input end of the rectifier is respectively connected to the power output end of the renewable energy power generation unit and the gas-fired combined power generation system, and the power output end of the rectifier is connected to the power input end of the water electrolysis hydrogen production device; The preparation system is used to control the on-off of the passage between the energy storage device and the water electrolysis hydrogen production device and the on-off of the passage between the rectifier device and the water electrolysis hydrogen production device according to the power supply and demand relationship; The preparation system is also used to control the distribution ratio of electric energy among the energy storage device, the rectifier device and the power consumption system in the gas-fired combined power generation system according to the power supply and demand relationship.

9. The methanol production system of cogeneration of heat and power according to claim 1, characterized in that: The gas-fired combined power generation system comprises: A gas turbine, wherein the working fluid input end of the gas turbine is connected to the unreacted gas output end of the methanol synthesis system, and the gas turbine is used to generate electricity using the unreacted gas, and the power output end of the gas turbine is respectively connected to the power input ends of the hydrogen production system and the power consumption system; A waste heat boiler, wherein a first working medium input end of the waste heat boiler is connected to an exhaust steam output end of the gas turbine, and pure water is introduced into a second working medium input end of the waste heat boiler, and the waste heat boiler is used to generate steam from the pure water using the exhaust steam of the gas turbine; A steam turbine, wherein the working fluid input end of the steam turbine is connected to the steam output end of the waste heat boiler, and the steam turbine is used to generate electricity using the steam, the power output end of the steam turbine is respectively connected to the power input ends of the hydrogen production system and the power consumption system, and the exhaust steam output end of the steam turbine is connected to the steam input end of the steam consumption system.

10. The methanol production system of cogeneration of heat and power according to claim 1, characterized in that: The steam system comprises: Industrial steam equipment and domestic heating equipment, the steam output end of the methanol synthesis system is connected to the steam input end of the industrial steam equipment and the domestic heating equipment respectively, and the steam output end of the gas-fired combined power generation system is connected to the steam input end of the industrial steam equipment and the domestic heating equipment respectively.

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