CN113944544A - Energy system based on renewable energy and hydrogen methanolization and energy utilization method - Google Patents
Energy system based on renewable energy and hydrogen methanolization and energy utilization method Download PDFInfo
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 66
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 11
- 125000004435 hydrogen atom Chemical class [H]* 0.000 title 1
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 257
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 94
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000000446 fuel Substances 0.000 claims abstract description 49
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 47
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 47
- 238000010248 power generation Methods 0.000 claims abstract description 47
- 238000003860 storage Methods 0.000 claims abstract description 38
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000001301 oxygen Substances 0.000 claims abstract description 36
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 36
- 238000002407 reforming Methods 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 24
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 24
- 239000002028 Biomass Substances 0.000 claims abstract description 23
- 238000002485 combustion reaction Methods 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 14
- 239000002737 fuel gas Substances 0.000 claims abstract description 7
- 238000005868 electrolysis reaction Methods 0.000 claims abstract 5
- 230000005611 electricity Effects 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000012824 chemical production Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
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- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 239000003502 gasoline Substances 0.000 description 3
- 239000005431 greenhouse gas Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 239000002803 fossil fuel Substances 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
- F02B43/10—Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
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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
- 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
- C25B3/00—Electrolytic production of organic compounds
- C25B3/01—Products
- C25B3/07—Oxygen containing compounds
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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
- C25B3/00—Electrolytic production of organic compounds
- C25B3/20—Processes
- C25B3/25—Reduction
- C25B3/26—Reduction of carbon dioxide
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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
- C25B9/60—Constructional parts of cells
- C25B9/65—Means for supplying current; Electrode connections; Electric inter-cell connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/007—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations the wind motor being combined with means for converting solar radiation into useful energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/20—Wind motors characterised by the driven apparatus
- F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
- H02S10/10—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power including a supplementary source of electric power, e.g. hybrid diesel-PV energy systems
- H02S10/12—Hybrid wind-PV energy systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
- F02B43/10—Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
- F02B2043/106—Hydrogen obtained by electrolysis
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Y02E10/70—Wind energy
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- Y02E50/00—Technologies for the production of fuel of non-fossil origin
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses an energy system based on renewable energy and hydrogen methanolizing and a utilization method thereof, wherein the energy system comprises: the system comprises a renewable energy power generation system, an electrolytic water system, a biomass oxygen-enriched combustion system, a methanol synthesis system, a liquid fuel storage and transportation system, a methanol reforming system and a fuel gas and steam combined cycle power generation system. Most of the electric energy generated by the renewable energy power generation system is used for generating hydrogen and oxygen by electrolysis in an electrolysis water system, the oxygen and the biomass fuel are sent to a biomass oxygen-enriched combustion system together to generate electric energy and carbon dioxide, the hydrogen and the carbon dioxide are used together to generate methanol through a methanol synthesis system, and the methanol is used as liquid fuel and is transported to various places through the liquid fuel storage and transportation system. Methanol can be converted into hydrogen by a methanol reforming system, the hydrogen is used as fuel, and power generation can also be carried out by a fuel gas-steam combined cycle power generation system.
Description
Technical Field
The invention belongs to the field of energy power generation, and relates to an energy system based on renewable energy and hydrogen methanolization and an energy utilization method.
Background
In recent years, with the rapid development of human society and economy, the consumption of a large amount of fossil fuels has led to the emission of a large amount of greenhouse gases, causing global warming and frequent extreme climates. In order to protect the environment on which humans rely for survival, reducing the emission of greenhouse gases has become an urgent task for humans. China announced in 2020 that carbon dioxide emission strives to reach a peak value by 2030 and strives to achieve carbon neutralization by 2060. To achieve this goal, it is critical to reduce the use of fossil energy, which makes the development of renewable energy a major trend in future energy development. China has clearly pointed out that by 2030, the proportion of renewable energy in an energy consumption structure reaches 25 percent; by the time carbon neutralization is achieved in 2060 years, the proportion of renewable energy sources in energy consumption structures is expected to reach more than 85%.
In the past decade, new energy power generation is rapidly developed in China, the technology is mature, and the low-price internet surfing is basically realized at present. In the future, the installed capacity and the generated energy of photovoltaic wind power still can be increased rapidly: the installed capacity of wind power and photovoltaic is expected to reach over 72.8 hundred million kilowatts in 2060 years, and the installed capacity of the wind power and photovoltaic is expected to exceed that of thermal power; the ratio of the installed capacity is expected to reach 90.8%, and the ratio of the installed capacity to the total generated energy is expected to reach 79.7%. Moreover, the power generation cost is expected to be further reduced, so that the power generation of renewable energy sources such as wind power and photovoltaic has wide economic prospects for large-scale application.
However, due to the volatility, discontinuity and instability of renewable energy, a serious challenge is brought to the safe and stable operation of a power grid and the consumption of renewable energy power generation. Due to the geographical conditions and resource limitations of China, China lacks peak regulation power supplies such as pumped storage power stations and gas power plants, most power grids in China at present mainly rely on the coal-fired power plants to regulate peaks and realize the consumption of renewable energy sources, and a large amount of greenhouse gas is discharged. A large amount of new energy electric power can not be absorbed, and the phenomenon of wind and light abandonment can be caused to a certain extent. In the future, as the renewable energy power generation capacity will continue to increase, even to 50% (2040 years is expected), how to take up the new energy power generation will face a serious challenge.
Compared with traditional energy storage modes such as pumped storage, electrochemical energy storage and the like, the hydrogen energy is a high-quality and clean large-scale energy storage carrier, the energy density is high, and the combustion is clean; the system can realize large-scale energy storage, can be used as clean gas fuel and chemical raw materials, and is expected to thoroughly solve the problems of discontinuous and unstable power generation of renewable energy sources. However, due to the special properties of hydrogen, hydrogen energy utilization is completely incompatible with the existing fossil energy utilization system, and a plurality of restriction factors exist: hydrogen end-use is expensive and complex, and has not been applied on a large scale; the hydrogen is flammable and explosive, has wide combustion range, and has the risk of leakage and explosion in the processes of preparation, storage, transportation, filling and use.
While methanol is considered an ideal carrier for hydrogen: the problem of poor transportation of hydrogen can be solved, and the hydrogen can be converted into hydrogen again for utilization through a methanol reforming technology. However, in the prior art, a reliable hydrogen methanolizing energy comprehensive system for utilizing renewable energy is provided.
Object of the Invention
The invention aims to solve the problems in the prior art and provides an energy system and an energy utilization method based on renewable energy and hydrogen methanolization.
Disclosure of Invention
According to one aspect of the present invention, there is provided an energy system based on renewable energy and hydrogen methanolizing, comprising: the system comprises a renewable energy power generation system, an electrolytic water system, a biomass oxygen-enriched combustion system, a methanol synthesis system, a liquid fuel storage and transportation system, a methanol reforming system and a fuel gas and steam combined cycle power generation system.
Preferably, the renewable energy power generation system generates power by using wind energy and/or solar energy, and comprises a wind generating set and/or a photovoltaic generating set, most of the generated electric energy is transmitted to a power grid, and the rest is provided to the electrolytic water system as waste electricity to be used for preparing hydrogen and oxygen;
in the biomass oxygen-enriched combustion system, biomass fuel and oxygen are combusted together to generate electricity to generate electric energy and carbon dioxide, most of the generated electric energy is transmitted to a power grid, and the generated carbon dioxide is stored in a first carbon dioxide storage tank to serve as a carbon source of the methanol synthesis system; NO nitrogen is participated in the co-combustion process, and NO NO is generated;
the methanol synthesis system synthesizes methanol by utilizing hydrogen and carbon dioxide in an electrolytic bath;
the liquid fuel storage and transportation system transports and stores the methanol synthesized by the methanol synthesis system to various places, and the transportation mode comprises tank car transportation, pipeline transportation and tank body water transportation;
the methanol reforming system converts methanol into hydrogen and carbon dioxide under medium and low temperature conditions, and the generated hydrogen is used for a fuel cell, a gas fuel or the fuel gas and steam combined cycle power generation system; the generated carbon dioxide is stored in a storage tank and recycled in the methanol synthesis system;
the gas-steam combined cycle power generation system converts the hydrogen generated by the methanol reforming system into electric energy.
According to another aspect of the present invention, there is provided an energy utilization method using the energy system described above, including the steps of:
step 1, generating power through a renewable energy power generation system, wherein the renewable energy power generation system comprises a wind power generator set and a photovoltaic generator set, most of the generated electric energy is transmitted to a power grid, and the rest of the generated electric energy is transmitted to an electrolytic water system as abandoned electricity;
step 5, taking the methanol produced in the step 4 as liquid fuel, and transporting the liquid fuel to various places through a liquid fuel storage and transportation system;
and 7, when the hydrogen generated in the step 6 is used for the gas-steam combined cycle power generation system, transmitting the generated electric energy to a power grid.
Preferably, the methanol produced in step 5 is used for chemical production (11), methanol fuel (12) or hydrogen production by a methanol reforming system (13).
Drawings
Fig. 1 is a schematic structural diagram of an energy system based on renewable energy and hydrogen methanolizing according to the present invention.
Reference numerals: 1-wind power generation; 2-photovoltaic; 3-a power grid; 4-an electrolytic cell; 5-an oxygen storage tank; 6-biomass fuel; 7-biomass oxygen-enriched combustion power plant; 8-a first carbon dioxide storage tank; a 9-methanol synthesis system; 10-liquid fuel storage and transportation system; 11-chemical utilization; 12-methanol fuel; 13-a methanol reforming system; 14-a carbon dioxide storage tank; 15-a fuel cell; 16-a gaseous fuel; 17-gas and steam combined cycle system.
Detailed Description
The invention is further described with reference to the following drawings and detailed description, it being emphasized that the following description is intended to be illustrative only and is not intended to limit the scope or application of the invention.
Fig. 1 is a schematic structural diagram of an energy system based on renewable energy and hydrogen methanolizing according to the present invention. As shown in figure 1, the energy system comprises a renewable energy power generation system, an electrolytic water system (4), a biomass oxygen-enriched combustion system (7), a methanol synthesis system (9), a liquid fuel storage and transportation system (10), a methanol reforming system (13) and a fuel gas and steam combined cycle power generation system (17); the renewable energy power generation system comprises wind power generation (1) and photovoltaic power generation (2), one part of the generated electric energy of which is transmitted to a power grid (3), and the other part is transmitted to an electrolytic water system (4) as abandoned electricity, the electrolytic water system (4) generates oxygen and hydrogen, wherein the oxygen is stored in an oxygen storage tank (5); the biomass fuel (6) and the oxygen in the oxygen storage tank (5) are sent to a biomass oxygen-enriched combustion system (7) together for combustion and power generation, the generated electric energy is sent to a power grid (3), and the generated carbon dioxide is stored in a first carbon dioxide storage tank (8); sending hydrogen generated by the electrolytic water system (4) and carbon dioxide in a first carbon dioxide storage tank (8) into a methanol synthesis system (9) to produce methanol; methanol generated by the methanol synthesis system (9) is used as liquid fuel and is transported to various places through a liquid fuel storage and transportation system (10); methanol produced by the methanol synthesis system (9) is used for chemical production (11), methanol fuel (12) or hydrogen production through the methanol reforming system (13); -converting methanol into hydrogen and carbon dioxide by means of the methanol reforming system (13), wherein the generated carbon dioxide is stored in a second carbon dioxide storage tank (14) and recycled in the methanol reforming system (13); the hydrogen produced by the methanol reforming system (13) is used in a fuel cell (15), a gaseous fuel (16) or a gas-steam combined cycle power generation system (17); the electric energy generated by the gas-steam combined cycle power generation system (17) is transmitted to the power grid (3).
The following is a specific embodiment of the present invention.
Example 1
According to the structural schematic diagram shown in fig. 1, an energy system based on renewable energy and hydrogen methanolizing is constructed, and is simulated and calculated, and the unit capacity of a generator set of a biomass oxygen-enriched combustion system (7) is set to be 10.7 MW; when the renewable energy power supplies 55000kWh power, the consumption rate of the biomass fuel (6) is 5800kg/h, and the lower calorific value of the biomass fuel (6) is 16.6 MJ/kg; the electrolytic water system (4) can generate 1000kg/h of hydrogen and 8000kg/h of oxygen, and the methanol synthesis system (9) can synthesize 5048kg/h of methanol.
Through simulation calculation, the power generation efficiency of the biomass oxygen-enriched combustion system (7) is 40%; the conversion efficiency from electricity to methanol was 50.8%; the overall energy efficiency of the energy system was 47.3% and the conversion efficiency from hydrogen to methanol was 71.8%.
The methanol is in a liquid state at normal temperature, the spontaneous combustion temperature is 436 ℃, the main transportation modes are tank truck transportation and pipeline transportation, the transportation cost is low, and the safety is good; the methanol has higher heat value and can be blended into gasoline to synthesize methanol gasoline, thereby reducing the consumption of fossil energy.
The methanol reforming system utilizes a methanol reforming technology to convert methanol into hydrogen and carbon dioxide; the technology can be used for reforming to generate hydrogen under the condition of medium and low temperature, and has the advantages of high hydrogen yield, low carbon monoxide yield, simple process operation, easy reaction condition achievement and the like; the generated hydrogen can be used for fuel cells, gas fuel and gas steam combined cycle power generation and the like; the generated carbon dioxide is stored in a storage tank and recycled in the methanol synthesis system, so that the emission of the carbon dioxide is avoided.
The fuel gas and steam combined cycle system converts hydrogen generated by the methanol reforming system into electric energy; the hydrogen is used as the fuel of the gas-steam combined cycle unit, and has the characteristics of high heat value, environmental protection and the like.
Compared with the prior art, the invention has the following advantages:
1. the wind power photovoltaic is used as power supply, so that the combustion of fossil fuel can be reduced, and the renewable energy power can be effectively consumed.
2. The carbon dioxide generated by the combustion of the biomass fuel can be regarded as zero, so that carbon emission is not generated, and even carbon negative emission can be achieved.
3. The invention adopts a methanol synthesis technology to convert hydrogen and carbon dioxide into methanol, and the methanol is liquid at normal temperature, is easy to store and transport, and effectively solves the problem of difficult storage and transportation of the hydrogen.
4. The produced methanol has higher heat value and can replace part of gasoline, thereby reducing the petroleum consumption and further relieving the current situation of petroleum shortage in China.
5. The hydrogen produced by the methanol reforming system can be used for gas-steam combined cycle power generation so as to provide clean power.
6. The carbon dioxide generated by reforming the methanol can be recycled to synthesize the methanol again, and the near zero emission of the carbon dioxide is realized.
The present embodiment is merely illustrative of the present patent and does not limit the scope of the patent, and modifications can be made to the details thereof without departing from the spirit and scope of the patent.
Claims (4)
1. An energy system based on renewable energy and hydrogen methanolizing, comprising: the system comprises a renewable energy power generation system, an electrolytic water system (4), a biomass oxygen-enriched combustion system (7), a methanol synthesis system (9), a liquid fuel storage and transportation system (10), a methanol reforming system (13) and a fuel gas and steam combined cycle power generation system (17).
2. Energy system according to claim 1, characterized in that said renewable energy power generation system generates electricity using wind energy and/or solar energy, comprising a wind-power generator set (1) and/or a photovoltaic generator set (2), the majority of the generated electric energy of which is sent to the electric grid (3), the rest being supplied as electricity discard to said electrolytic water system (4) for the production of hydrogen and oxygen;
in the biomass oxygen-enriched combustion system (7), biomass fuel (6) and oxygen are combusted together to generate electricity and generate electric energy and carbon dioxide, most of the generated electric energy is transmitted to a power grid (3), and the generated carbon dioxide is stored in a first carbon dioxide storage tank (8) to be used as a carbon source of the methanol synthesis system (9); NO nitrogen is participated in the co-combustion process, and NO NO is generated;
the methanol synthesis system (9) synthesizes methanol in an electrolytic cell by using hydrogen and carbon dioxide;
the liquid fuel storage and transportation system (10) transports and stores the methanol synthesized by the methanol synthesis system (9) to various places, and the transportation modes comprise tank car transportation, pipeline transportation and tank body water transportation;
the methanol reforming system (13) converts methanol to hydrogen and carbon dioxide under medium and low temperature conditions, and the generated hydrogen is used for a fuel cell, a gas fuel or the gas-steam combined cycle power generation system (17); the produced carbon dioxide is stored in a storage tank and recycled in the methanol synthesis system (9);
the gas-steam combined cycle power generation system (17) converts hydrogen generated by the methanol reforming system (13) into electric energy.
3. A method for utilizing energy using the energy system according to claim 1 or 2, characterized by comprising the steps of:
step 1, generating power through a renewable energy power generation system, wherein the renewable energy power generation system comprises wind power generation (1) and photovoltaic power generation (2), most of generated electric energy is transmitted to a power grid (3), and the rest of generated electric energy is transmitted to an electrolytic water system (4) as abandoned electricity;
step 2, converting water into hydrogen and oxygen in an electrolytic water system (4), and storing the generated oxygen in an oxygen storage tank (5); the water electrolysis system (4) adopts alkaline electrolyzed water to produce hydrogen, wherein the temperature of the alkaline electrolyzed water is 50-100 ℃, and the energy efficiency of the water electrolysis system is 60-75%;
step 3, the biomass fuel (6) and the oxygen in the oxygen storage tank (5) are sent to a biomass oxygen-enriched combustion system (7) to be combusted together for power generation, the generated electric energy is transmitted to a power grid (3), and the generated carbon dioxide is stored in a first carbon dioxide storage tank (8); NO nitrogen is participated in the co-combustion process, and NO NO is generated;
step 4, sending hydrogen generated by the water electrolysis system (4) and carbon dioxide in the first carbon dioxide storage tank (8) into a methanol synthesis system (9) to synthesize methanol in an electrolytic cell, wherein in the methanol synthesis process, the reaction temperature is 200-230 ℃, the reaction pressure is 7.9MPa, and the molar ratio of the hydrogen to the carbon dioxide is 2-3;
step 5, taking the methanol produced in the step 4 as liquid fuel, and transporting the liquid fuel to various places through a liquid fuel storage and transportation system (10);
step 6, converting the methanol produced in the step 5 into hydrogen and carbon dioxide through the methanol reforming system (13), wherein the produced carbon dioxide is stored in a second carbon dioxide storage tank (14) and recycled in the methanol reforming system (13); the generated hydrogen is used for a fuel cell (15), a gas fuel (16) or a gas-steam combined cycle power generation system (17);
and 7, when the hydrogen generated in the step 6 is used for the gas-steam combined cycle power generation system (17), transmitting the generated electric energy to the power grid (3).
4. The energy utilization method according to claim 3, wherein the methanol produced in step 5 is used for chemical production (11), methanol fuel (12) or hydrogen production by a methanol reforming system (13).
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