CN114481176A - Offshore wind power energy storage system based on electrolytic synthesis of methanol - Google Patents
Offshore wind power energy storage system based on electrolytic synthesis of methanol Download PDFInfo
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 482
- 238000003786 synthesis reaction Methods 0.000 title claims abstract description 95
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 85
- 238000004146 energy storage Methods 0.000 title claims abstract description 23
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 119
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 65
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 63
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 61
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 60
- 239000001257 hydrogen Substances 0.000 claims abstract description 34
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 34
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000013535 sea water Substances 0.000 claims abstract description 26
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 25
- 238000010248 power generation Methods 0.000 claims abstract description 20
- 238000010612 desalination reaction Methods 0.000 claims abstract description 18
- 239000013505 freshwater Substances 0.000 claims abstract description 18
- 238000003860 storage Methods 0.000 claims abstract description 18
- 238000005553 drilling Methods 0.000 claims abstract description 6
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 5
- 239000002912 waste gas Substances 0.000 claims abstract description 4
- 238000009792 diffusion process Methods 0.000 claims description 29
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 29
- 229910000457 iridium oxide Inorganic materials 0.000 claims description 15
- 229910052697 platinum Inorganic materials 0.000 claims description 15
- 239000000956 alloy Substances 0.000 claims description 14
- 229910045601 alloy Inorganic materials 0.000 claims description 14
- HTXDPTMKBJXEOW-UHFFFAOYSA-N dioxoiridium Chemical compound O=[Ir]=O HTXDPTMKBJXEOW-UHFFFAOYSA-N 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 14
- 239000012528 membrane Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 11
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 238000000746 purification Methods 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 9
- 238000000605 extraction Methods 0.000 claims description 7
- 238000003808 methanol extraction Methods 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 238000001223 reverse osmosis Methods 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 6
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 5
- 239000003054 catalyst Substances 0.000 claims description 5
- 230000002194 synthesizing effect Effects 0.000 claims description 4
- 239000004693 Polybenzimidazole Substances 0.000 claims description 3
- 229910007470 ZnO—Al2O3 Inorganic materials 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000011068 loading method Methods 0.000 claims description 3
- 229920002480 polybenzimidazole Polymers 0.000 claims description 3
- 230000009919 sequestration Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
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- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000419 plant extract Substances 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
- C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
- C25B9/23—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms comprising ion-exchange membranes in or on which electrode material is embedded
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- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/02—Process control or regulation
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- C25B3/00—Electrolytic production of organic compounds
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- C25B3/00—Electrolytic production of organic compounds
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- C25B3/25—Reduction
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- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/60—Constructional parts of cells
- C25B9/65—Means for supplying current; Electrode connections; Electric inter-cell connections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides an offshore wind power energy storage system based on methanol electrolytic synthesis, and relates to the technical field of energy. The system comprises an offshore wind power generation system, an electrolytic synthesis methanol system, a carbon capture system, a seawater desalination system and a methanol product storage tank, wherein the offshore wind power generation system generates electricity by using offshore wind energy, and the generated electric energy is transmitted to an electrolytic synthesis methanol system, a carbon capture system collects carbon dioxide in the waste gas of the offshore drilling platform, and the obtained carbon dioxide is introduced into a methanol electrolysis synthesis system, a seawater desalination system prepares fresh water from seawater, and the fresh water is introduced into an electrolytic synthesis methanol system, the electrolytic synthesis methanol system utilizes electric energy to electrolyze the fresh water to generate hydrogen, the hydrogen and carbon dioxide are subjected to synthesis reaction to prepare methanol, the methanol is stored in a methanol product storage tank, therefore, offshore wind power is converted into methanol, peak-shaving frequency-modulation auxiliary service can be provided for a power grid, the problem that the offshore wind power is difficult to absorb is solved, and the problem that hydrogen is difficult to store and transport on a large scale is solved.
Description
Technical Field
The invention relates to the technical field of energy, in particular to an offshore wind power energy storage system based on methanol electrolytic synthesis.
Background
The offshore wind power generation has the characteristics of abundant resources, high electricity generation utilization hours, no land occupation, no water resource consumption, suitability for large-scale development and the like, and has very wide development space. However, the instability of the generated power of the wind turbine increases the demand of the power grid on peak regulation and frequency modulation, offshore wind energy cannot be effectively utilized, and then the phenomenon of wind abandon occurs. The water electrolysis hydrogen production technology is considered to be an effective means for solving the problems of fluctuation, intermittence and large-span space-time storage of offshore wind power, but the density of hydrogen is low (the density of hydrogen at 0 ℃ is only 0.0899g/L), the liquefaction temperature is extremely low (the liquefaction temperature is-252.77 ℃ under standard atmospheric pressure), the energy consumption is extremely high, and the properties make the high-density storage and transportation of hydrogen difficult.
The methanol is an ideal liquid hydrogen storage carrier, the hydrogen content of the methanol is up to 12.5 percent, and the hydrogen can be prepared by cracking and Pressure Swing Adsorption (PSA), thereby having great significance for adjusting the energy structure in China. In addition, methanol is an important basic chemical raw material, the consumption is only after ethylene and propylene, 90% of methanol is used in chemical industry, and is mainly used for producing basic chemicals such as formaldehyde (POM), acetic acid, ethylene glycol and the like, and the methanol can be doped into gasoline to be used as an environment-friendly fuel due to the good solvent characteristic of the methanol; meanwhile, the methanol can be used for preparing olefin (MTO), gasoline (MTG) and the like through further reaction, and has wide application value.
However, at present, an effective scheme for combining the hydrogen production by offshore wind power and the methanol synthesis is still lacking, the application of the water electrolysis hydrogen production technology in the development of offshore wind power is limited, and the problems of wind abandoning and electricity abandoning of an offshore wind power project cannot be effectively solved.
Disclosure of Invention
The invention aims to provide an offshore wind power energy storage system based on methanol electrolytic synthesis, which can combine offshore wind power hydrogen production with methanol synthesis, effectively solve the problem that hydrogen energy is difficult to store and transport in offshore wind power hydrogen production, provide peak-load and frequency-modulation auxiliary service for a power grid, and further effectively solve the problem of offshore wind abandoning and electricity abandoning.
Embodiments of the invention may be implemented as follows:
the invention provides an offshore wind power energy storage system based on methanol electrolytic synthesis, which comprises an offshore wind power generation system, a methanol electrolytic synthesis system, a carbon capture system, a seawater desalination system and a methanol product storage tank, wherein the offshore wind power energy storage system based on methanol electrolytic synthesis comprises a wind power generation system, a methanol electrolytic synthesis system, a carbon capture system, a seawater desalination system and a methanol product storage tank;
the offshore wind power generation system generates power by using offshore wind energy and transmits the generated electric energy to the methanol electrolysis synthesis system;
the carbon capture system is used for collecting carbon dioxide in the waste gas of the offshore drilling platform and introducing the obtained carbon dioxide into the methanol electrolysis synthesis system;
the seawater desalination system is used for preparing fresh water from seawater and introducing the fresh water into the methanol electrolysis synthesis system;
the electrolytic synthesis methanol system utilizes electric energy to electrolyze fresh water to generate hydrogen, the hydrogen and carbon dioxide are subjected to synthesis reaction to prepare methanol, and the methanol is stored in a methanol product storage tank.
In an alternative embodiment, the offshore wind power generation system comprises a wind driven generator and an AC/DC rectifier, one end of the AC/DC rectifier is connected with the wind driven generator through a wire, the other end of the AC/DC rectifier is connected with the methanol electrolysis synthesis system through a wire, the wind driven generator generates electricity by using offshore wind power, and the AC/DC rectifier is used for converting alternating current generated by the wind driven generator into direct current, rectifying and filtering the direct current, and then transmitting the direct current to the methanol electrolysis synthesis system.
In an alternative embodiment, the carbon capture system comprises a carbon capture device, a carbon dioxide pressurizing device and a carbon dioxide heating device which are sequentially communicated through a pipeline, wherein the carbon capture device is used for capturing carbon dioxide in the exhaust gas of the offshore drilling platform, the carbon dioxide pressurizing device is used for pressurizing the carbon dioxide to the pressure required by the methanol synthesis reaction, and the carbon dioxide heating device is used for heating the carbon dioxide to the temperature required by the methanol synthesis reaction.
In an alternative embodiment, the carbon capture system further comprises a marine carbon seal injection gas line bypass in communication with the carbon dioxide pressurizing device, the marine carbon seal injection gas line bypass being configured to withdraw carbon dioxide from the carbon seal injection gas line and deliver the carbon dioxide to the carbon dioxide pressurizing device.
In an alternative embodiment, the seawater desalination system comprises a reverse osmosis seawater desalination plant, wherein the reverse osmosis seawater desalination plant extracts fresh water from seawater by using a reverse osmosis technology, and the obtained fresh water is introduced into the methanol electrolysis synthesis system.
In an optional embodiment, the system for synthesizing methanol by electrolysis comprises a methanol synthesis electrolytic cell, a methanol cooling device and a methanol separation and purification device which are sequentially communicated through a pipeline, wherein the methanol synthesis electrolytic cell uses electric energy provided by an offshore wind power generation system to electrolyze fresh water to generate hydrogen and synthesizes the hydrogen with carbon dioxide introduced into the methanol synthesis electrolytic cell into gaseous methanol, the methanol cooling device is used for cooling the gaseous methanol at the outlet of the methanol synthesis electrolytic cell to obtain crude methanol, and the methanol separation and purification device is used for separating and purifying the crude methanol into national standard methanol products and storing the national standard methanol products in a methanol product storage tank.
In an alternative embodiment, the methanol synthesis electrolytic cell comprises a power supply, a proton exchange membrane, a platinum-based alloy cathode, an iridium oxide anode, a carbon felt cathode diffusion layer, a carbon felt anode diffusion layer, the device comprises a cathode plate, an anode plate, a gaseous methanol extraction pipe, an oxygen extraction pipe, a carbon dioxide feeding pipe and a water replenishing pipe, wherein a platinum-based alloy cathode and an iridium oxide anode are respectively connected to two ends of a power supply, a proton exchange membrane is arranged between the platinum-based alloy cathode and the iridium oxide anode, a carbon felt cathode diffusion layer is arranged on the outer side of the platinum-based alloy cathode, a carbon felt anode diffusion layer is arranged on the outer side of the iridium oxide anode, the cathode plate is arranged on the outer side of the carbon felt cathode diffusion layer, the gaseous methanol extraction pipe and the carbon dioxide feeding pipe penetrate through the cathode plate and are communicated with the carbon felt cathode diffusion layer, the anode plate is arranged on the outer side of the carbon felt anode diffusion layer, and the oxygen extraction pipe and the water replenishing pipe penetrate through the anode plate and are communicated with the carbon felt anode diffusion layer.
In an alternative embodiment, the proton exchange membrane material is a phosphoric acid doped polybenzimidazole membrane with a phosphoric acid doping level of 160-210 wt.%.
In an alternative embodiment, the surface of the carbon felt cathode diffusion layer is laid with CuO-ZnO-Al2O3The unit area loading of the catalyst is 1-10mg/cm2。
In an alternative embodiment, the hydrogen-carbon volume ratio of the cathode chamber in the methanol synthesis electrolytic cell is 3-6, the pressure of the cathode chamber is 5-10MPa, and the temperature of the cathode chamber is 100-250 ℃.
The offshore wind power energy storage system based on methanol electrolytic synthesis provided by the embodiment of the invention has the beneficial effects that:
1. the wind power generation system can operate at the peak period of offshore wind power output, has better dynamic performance, can provide peak-shaving frequency-modulation auxiliary service for a power grid, increases the offshore wind power grid-connection friendliness, and further solves the problems of wind abandonment and electricity abandonment at sea;
2. the offshore wind power hydrogen production and methanol synthesis are combined by utilizing the technology of synthesizing methanol by electrolysis, the methanol is in a liquid state at normal temperature and normal pressure, the property is stable, the hydrogen storage capacity is high, the transportation safety and the economy are better, and the problem that the hydrogen energy is difficult to store and transport in the offshore wind power hydrogen production can be effectively solved;
3. the methanol synthesis raw materials adopt industrial waste gas and seawater, the cost is low, the source is wide, carbon dioxide and other greenhouse gas are not discharged in the process, carbon dioxide can be recycled to play a carbon fixation role, and the method is clean and environment-friendly.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a block diagram of an offshore wind power energy storage system based on methanol electrolysis synthesis provided by an embodiment of the invention;
FIG. 2 is a schematic view of the structure of the electrolytic cell of FIG. 1.
Icon: 100-an offshore wind power energy storage system based on methanol electrolysis synthesis; 110-offshore wind power generation systems; 111-a wind power generator; 112-AC/DC rectifier; 120-electrolytic synthesis of methanol system; 121-methanol synthesis electrolyzer; 1211-power supply; 1212-proton exchange membrane; 1213-platinum-based alloy cathode; 1214-iridium oxide anode; 1215-a carbon felt cathodic diffusion layer; 1216-carbon felt anodic diffusion layer; 1217-cathode plate; 1218-anode plate; 1219-gaseous methanol extraction line; 1220-oxygen extraction tube; 1221-carbon dioxide feed line; 1222-a water replenishing pipe; a 123-methanol cooling device; 124-methanol separation and purification device; 130-a carbon capture system; 131-a carbon capture device; 132-a carbon dioxide pressurizing device; 133-a carbon dioxide heating device; 140-a seawater desalination system; 150-methanol product storage tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Referring to fig. 1, the embodiment provides an offshore wind power energy storage system 100 based on methanol electrolysis synthesis, which includes an offshore wind power generation system 110, an methanol electrolysis synthesis system 120, a carbon capture system 130, a seawater desalination system 140, and a methanol product storage tank 150.
Specifically, the offshore wind power generation system 110 generates electricity using offshore wind power and transfers the generated electricity to the methanol electrolysis synthesis system 120.
The offshore wind power generation system 110 comprises a wind power generator 111 and an AC/DC rectifier 112, one end of the AC/DC rectifier 112 is connected with the wind power generator 111 through a wire, the other end of the AC/DC rectifier 112 is connected with a methanol synthesis electrolyzer 121 in the methanol electrolysis synthesis system 120 through a wire, the wind power generator 111 generates power by using offshore wind energy, and the AC/DC rectifier 112 is used for converting unstable alternating current generated by the wind power generator 111 into direct current, rectifying and filtering the direct current, and then transmitting the direct current to the methanol synthesis electrolyzer 121 so as to meet the low-voltage direct current required by the methanol synthesis electrolyzer 121.
The carbon capture system 130 is used to capture and provide the carbon dioxide required for the methanol synthesis reaction.
The carbon capture system 130 comprises a carbon capture device 131, a carbon dioxide pressurizing device 132 and a carbon dioxide heating device 133 which are sequentially communicated through pipelines, wherein the carbon capture device 131 is used for capturing carbon dioxide in the waste gas of the offshore drilling platform, a marine carbon sealing and gas injection pipeline bypass (not shown in the figure) communicated with the carbon dioxide pressurizing device 132 can be further arranged, the marine carbon sealing and gas injection pipeline bypass is used for pumping out the carbon dioxide in the carbon sealing and gas injection pipeline, the carbon dioxide pressurizing device 132 is used for pressurizing the carbon dioxide to the pressure (5-10MPa) required by the methanol synthesis reaction, and the carbon dioxide heating device 133 is used for heating the carbon dioxide to the temperature (150 ℃ and 250 ℃) required by the methanol synthesis reaction.
A fourth check valve (not shown) for preventing backflow of carbon dioxide is disposed on a pipeline between the bypass of the marine carbon sequestration gas injection pipeline and the carbon dioxide pressurizing device 132, and a fifth check valve (not shown) for preventing backflow of carbon dioxide is disposed on a pipeline between the carbon dioxide heating device 133 and the methanol synthesis electrolytic cell 121.
The seawater desalination system 140 is used for generating and supplementing fresh water required for electrolysis, and the seawater desalination system 140 is connected with a water replenishing port (see fig. 2) of the methanol synthesis electrolytic cell 121 through a water pipe. The seawater desalination system 140 includes a reverse osmosis seawater desalination plant that extracts fresh water from seawater using a reverse osmosis technique and passes the resulting fresh water into the anode chamber of the methanol synthesis electrolyzer 121.
The electrolytic synthesis methanol system 120 comprises a methanol synthesis electrolytic cell 121, a methanol cooling device 123 and a methanol separation and purification device 124 which are sequentially communicated through a pipeline, wherein the methanol synthesis electrolytic cell 121 uses electric energy provided by the offshore wind power generation system 110 to electrolyze water to generate hydrogen, and further synthesizes gaseous methanol with carbon dioxide introduced into the methanol synthesis electrolytic cell 121, the methanol cooling device 123 is used for cooling the gaseous methanol at the outlet of the methanol synthesis electrolytic cell 121 to obtain crude methanol, and the methanol separation and purification device 124 is used for separating and purifying the crude methanol into national standard methanol products and storing the crude methanol products in a methanol product storage tank 150.
A first check valve (not shown in the figure) for preventing the backflow of the gaseous methanol is arranged on a pipeline between the methanol synthesis electrolytic cell 121 and the methanol cooling device 123, a second check valve (not shown in the figure) for preventing the backflow of the crude methanol is arranged on a pipeline between the methanol cooling device 123 and the methanol separation and purification device 124, and a third check valve (not shown in the figure) for preventing the backflow of the methanol product is arranged on a pipeline between the methanol separation and purification device 124 and the methanol product storage tank 150 at the rear end.
Referring to FIG. 2, the methanol synthesis electrolyzer 121 is a PEM 1212 electrolyzer with a dynamic response at full load/sec.
The methanol synthesis electrolyzer 121 comprises a power source 1211, a proton exchange membrane 1212, a platinum-based alloy cathode 1213, an iridium oxide anode 1214, a carbon felt cathode diffusion layer 1215, a carbon felt anode diffusion layer 1216, a cathode plate 1217, an anode plate 1218, a gaseous methanol extraction pipe 1219, an oxygen extraction pipe 1220, a carbon dioxide feed pipe 1221 and a make-up water pipe 1222.
The platinum-based alloy cathode 1213 and the iridium oxide anode 1214 are respectively connected to two ends of the power source 1211, the platinum-based alloy cathode 1213 uses a platinum-based composite metal catalyst, and the iridium oxide anode 1214 uses an iridium oxide catalyst.
A proton exchange membrane 1212 is disposed between the platinum-based alloy cathode 1213 and the iridium oxide anode 1214, and the material of the proton exchange membrane 1212 is phosphoric acid (H)3PO4) The doped polybenzimidazole membrane has the phosphoric acid doping amount of 160-210 wt.%, and has the performance requirements of high proton conductivity, good chemical stability, mechanical stability and gas permeability resistance under high pressure (5-10MPa) and high temperature environment (100-250 ℃).
Carbon felt cathode diffusion layer 1215 is arranged outside the platinum-based alloy cathode 1213, and the surface of the carbon felt cathode diffusion layer 1215 is coated with CuO-ZnO-Al2O3The unit area loading of the catalyst is 1-10mg/cm2. The carbon felt anode diffusion layer 1216 is disposed outside the iridium oxide anode 1214, the cathode plate 1217 is disposed outside the carbon felt cathode diffusion layer 1215, the gaseous methanol extraction pipe 1219 and the carbon dioxide feed pipe 1221 are communicated to the carbon felt cathode diffusion layer 1215 through the cathode plate 1217, the anode plate 1218 is disposed outside the carbon felt anode diffusion layer 1216, and the oxygen extraction pipe 1220 and the water replenishment pipe 1222 are communicated to the carbon felt anode diffusion layer 1216 through the anode plate 1218.
The volume ratio of hydrogen to carbon in the cathode chamber in the methanol synthesis electrolytic cell 121 is 3-6, the pressure in the cathode chamber is 5-10MPa, the temperature in the cathode chamber is 100-:
cathode reaction equation: (1)4H++4e－→2H2(2)3H2+CO2→CH3OH+H2O
Anode reaction equation: (3)2H2O→O2+4H++4e－
The offshore wind power energy storage system 100 based on methanol electrolytic synthesis provided by the embodiment of the invention has the beneficial effects that:
1. the wind power generation system can operate at the peak period of offshore wind power output, has better dynamic performance, can provide peak-shaving frequency-modulation auxiliary service for a power grid, increases the offshore wind power grid-connection friendliness, and further solves the problems of wind abandonment and electricity abandonment at sea;
2. the offshore wind power hydrogen production and methanol synthesis are combined by utilizing the technology of synthesizing methanol by electrolysis, the methanol is in a liquid state at normal temperature and normal pressure, the property is stable, the hydrogen storage capacity is high, the transportation safety and the economy are better, and the problem that the hydrogen energy is difficult to store and transport in the offshore wind power hydrogen production can be effectively solved;
3. industrial waste gas and seawater are adopted as raw materials for methanol synthesis, so that the cost is low, the source is wide, carbon dioxide and other greenhouse gas are not discharged in the process, carbon dioxide can be recycled to play a role in carbon fixation, and the method is clean and environment-friendly;
4. the reaction heat energy required by the methanol synthesis process is partially from the heat generated in the hydrogen production process in the methanol synthesis electrolytic tank 121, so that the energy is saved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An offshore wind power energy storage system based on methanol electrolytic synthesis is characterized in that the offshore wind power energy storage system based on methanol electrolytic synthesis comprises an offshore wind power generation system (110), a methanol electrolytic synthesis system (120), a carbon capture system (130), a seawater desalination system (140) and a methanol product storage tank (150);
the offshore wind power generation system (110) is used for generating power by using offshore wind energy and transmitting the generated electric energy to the methanol electrolytic synthesis system (120);
the carbon capture system (130) is used for collecting carbon dioxide in the off-gas of the offshore drilling platform and leading the obtained carbon dioxide to the methanol electrolytic synthesis system (120);
the seawater desalination system (140) is used for preparing fresh water from seawater and introducing the fresh water into the methanol electrolysis synthesis system (120);
the electrolytic synthesis methanol system (120) is used for electrolyzing fresh water by using electric energy to generate hydrogen, and is used for carrying out synthesis reaction on the hydrogen and the carbon dioxide to prepare methanol, and storing the methanol in a methanol product storage tank (150).
2. Offshore wind power generation energy storage system based on methanol electrolysis synthesis according to claim 1, characterized in that the offshore wind power generation system (110) comprises a wind power generator (111) and an AC/DC rectifier (112), one end of the AC/DC rectifier (112) is connected with the wind power generator (111) through a wire, the other end is connected with the methanol electrolysis synthesis system (120) through a wire, the wind power generator (111) is used for generating power by using offshore wind energy, and the AC/DC rectifier (112) is used for converting alternating current generated by the wind power generator (111) into direct current and sending the direct current to the methanol electrolysis synthesis system (120) after rectification and filtration.
3. Offshore wind power energy storage system based on electrolytic synthesis of methanol according to claim 1, characterized in that the carbon capture system (130) comprises a carbon capture device (131), a carbon dioxide pressurizing device (132) and a carbon dioxide heating device (133) which are sequentially communicated through a pipeline, wherein the carbon capture device (131) is used for capturing carbon dioxide in the offshore drilling platform waste gas, the carbon dioxide pressurizing device (132) is used for pressurizing carbon dioxide to the pressure required by the methanol synthesis reaction, and the carbon dioxide heating device (133) is used for heating carbon dioxide to the temperature required by the methanol synthesis reaction.
4. Offshore wind power energy storage system based on electrolytic synthesis of methanol according to claim 3, characterized by the fact that the carbon capture system (130) further comprises a marine carbon sequestration gas injection line bypass in communication with the carbon dioxide pressurizing device (132) for withdrawing carbon dioxide within the carbon sequestration gas injection line and feeding it to the carbon dioxide pressurizing device (132).
5. Offshore wind power energy storage system based on the electrolytic synthesis of methanol according to claim 1, characterized in that the seawater desalination system (140) comprises a reverse osmosis seawater desalination plant, which uses reverse osmosis technology to extract fresh water from seawater and passes the obtained fresh water to the electrolytic synthesis of methanol system (120).
6. The offshore wind power energy storage system based on methanol electrolysis synthesis according to claim 1, wherein the methanol electrolysis synthesis system (120) comprises a methanol synthesis electrolytic cell (121), a methanol cooling device (123) and a methanol separation and purification device (124) which are sequentially communicated through a pipeline, the methanol synthesis electrolytic cell (121) is used for electrolyzing fresh water by using electric energy provided by the offshore wind power generation system (110) to generate hydrogen and synthesizing gaseous methanol with carbon dioxide introduced into the methanol synthesis electrolytic cell (121), the methanol cooling device (123) is used for cooling gaseous methanol at the outlet of the methanol synthesis electrolytic cell (121) to obtain crude methanol, and the methanol separation and purification device (124) is used for separating and purifying crude methanol into national standard methanol products and storing the national standard methanol products in the methanol product storage tank (150).
7. Offshore wind power energy storage system based on electrolytic synthesis of methanol according to claim 6, characterized by the fact that the methanol synthesis electrolyzer (121) comprises a power supply (1211), a proton exchange membrane (1212), a platinum based alloy cathode (1213), an iridium oxide anode (1214), a carbon felt cathode diffusion layer (1215), a carbon felt anode diffusion layer (1216), a cathode plate (1217), an anode plate (1218), a gaseous methanol extraction pipe (1219), an oxygen extraction pipe (1220), a carbon dioxide feed pipe (1221) and a water replenishment pipe (1222), the platinum based alloy cathode (1213) and the iridium oxide anode (1214) being connected to both ends of the power supply (1211), respectively, the proton exchange membrane (1212) being arranged between the platinum based alloy cathode (1213) and the iridium oxide anode (1214), the carbon felt cathode diffusion layer (1215) being arranged outside the platinum based alloy cathode (1213), the carbon felt anode diffusion layer (1216) is disposed outside the iridium oxide anode (1214), the cathode plate (1217) is disposed outside the carbon felt cathode diffusion layer (1215), the gaseous methanol extraction pipe (1219) and the carbon dioxide feed pipe (1221) are communicated to the carbon felt cathode diffusion layer (1215) through the cathode plate (1217), the anode plate (1218) is disposed outside the carbon felt anode diffusion layer (1216), and the oxygen extraction pipe (1220) and the water replenishment pipe (1222) are communicated to the carbon felt anode diffusion layer (1216) through the anode plate (1218).
8. Offshore wind power energy storage system according to claim 7, wherein said proton exchange membrane (1212) is a polybenzimidazole membrane doped with phosphoric acid in an amount of 160-210 wt.%.
9. Offshore wind power energy storage system based on electrolytic synthesis of methanol according to claim 7, characterized by the fact that the surface of said carbon felt cathode diffusion layer (1215) is laid CuO-ZnO-Al2O3The unit area loading of the catalyst is 1-10mg/cm2。
10. Offshore wind power energy storage system based on electrolytic synthesis of methanol according to claim 7, characterized by the volume ratio of hydrogen to carbon in the cathode compartment of the methanol synthesis cell (121) being 3-6, the pressure in the cathode compartment being 5-10MPa and the temperature in the cathode compartment being 100-250 ℃.
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