CN114776441A - CO2Comprehensive energy system for co-electrolysis combined oxygen-enriched combustion power generation and co-production method - Google Patents
CO2Comprehensive energy system for co-electrolysis combined oxygen-enriched combustion power generation and co-production method Download PDFInfo
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 239000001301 oxygen Substances 0.000 title claims abstract description 70
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 70
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 60
- 238000010248 power generation Methods 0.000 title claims abstract description 57
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 84
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 70
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 35
- 238000000926 separation method Methods 0.000 claims abstract description 27
- 239000003546 flue gas Substances 0.000 claims abstract description 22
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 21
- 239000001257 hydrogen Substances 0.000 claims abstract description 21
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 21
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 19
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 19
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 19
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 19
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000002803 fossil fuel Substances 0.000 claims abstract description 18
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 11
- 230000002194 synthesizing effect Effects 0.000 claims abstract description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 46
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 38
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 33
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 20
- 239000001569 carbon dioxide Substances 0.000 claims description 16
- 239000000126 substance Substances 0.000 claims description 14
- 238000005516 engineering process Methods 0.000 claims description 13
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 10
- 235000019253 formic acid Nutrition 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 239000003054 catalyst Substances 0.000 claims description 6
- 125000001967 indiganyl group Chemical group [H][In]([H])[*] 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 239000000446 fuel Substances 0.000 claims description 5
- 238000003487 electrochemical reaction Methods 0.000 claims description 4
- MPMSMUBQXQALQI-UHFFFAOYSA-N cobalt phthalocyanine Chemical compound [Co+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 MPMSMUBQXQALQI-UHFFFAOYSA-N 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 3
- 150000002431 hydrogen Chemical class 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims description 3
- 229910001887 tin oxide Inorganic materials 0.000 claims description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 abstract description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 10
- 230000009467 reduction Effects 0.000 abstract description 9
- 230000005611 electricity Effects 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 3
- 239000013064 chemical raw material Substances 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 239000003245 coal Substances 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
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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
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/04—Preparation of ammonia by synthesis in the gas phase
-
- 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
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
- F25J3/04527—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general
- F25J3/04533—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general for the direct combustion of fuels in a power plant, so-called "oxyfuel combustion"
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
- F25J3/04563—Integration with a nitrogen consuming unit, e.g. for purging, inerting, cooling or heating
- F25J3/04587—Integration with a nitrogen consuming unit, e.g. for purging, inerting, cooling or heating for the NH3 synthesis, e.g. for adjusting the H2/N2 ratio
-
- 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
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
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- Materials Engineering (AREA)
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- Inorganic Chemistry (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
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- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The invention provides a CO2The system comprises a wind power or photovoltaic power generation system, a water electrolysis cell, an air separation device, an ammonia synthesis module, an oxygen-enriched combustion power generation module and CO2And H2And O is shared by the electrolytic cells. The invention utilizes wind energy orThe solar power generation drives air to be separated into nitrogen and oxygen, drives water to be electrolyzed into hydrogen and oxygen, the oxygen is used as a combustion improver for combustion of fossil fuel, the fossil fuel generates power to output electric energy, the generated high-temperature flue gas can be directly introduced into a water electrolysis cell to be co-electrolyzed to generate hydrocarbon, and the hydrocarbon is liquid at normal temperature, is convenient to store and transport and is an important chemical raw material. The power source is wind energy or solar energy power generation, CO2The emission is reduced. Synthesizing ammonia by hydrogen and nitrogen. Realize the CO-production of electricity, hydrocarbon, ammonia and the like, and CO2High-valued resource utilization is realized, so that the carbon emission reduction cost is offset, and the low-carbon efficient reformation of a fossil fuel power generation system is facilitated.
Description
Technical Field
The invention belongs to the technical field of comprehensive energy application, and particularly relates to CO2A comprehensive energy system combining co-electrolysis and oxygen-enriched combustion power generation and a co-production method.
Background
In order to reduce the greenhouse effect, the energy system is undergoing a green low-carbon transformation, and the reduction of the carbon dioxide emission of the energy system has become a consensus of human society. The carbon dioxide capture, utilization and sequestration technology (CCUS) plays an important role in green low-carbon reformation of an energy system, and particularly for energy intensive industries such as thermal power generation, cement, steel and the like, the CCUS technology can be well combined with the existing equipment, so that large-scale reconstruction of infrastructure is avoided.
However, the CCUS technology requires a new investment and is expensive to operate. For example, the current technology for reducing carbon emission in thermal power generation mainly absorbs and separates carbon dioxide in the combusted flue gas by a chemical absorption or physical adsorption method, but because the volume fraction of the carbon dioxide in the flue gas is low, such a capture system is large, and the energy consumption for separation and analysis is high (the power supply efficiency is reduced by 10-15%). Therefore, the high carbon emission reduction cost brings great difficulty to the low-carbon clean reform in the fields of thermal power generation and the like.
CCUS technology can be passed through CO2The carbon is converted into high value-added raw materials, so that the wide market of the high value-added raw materials of the modern chemical industry is fully utilized to reduce the carbon emission reduction cost. For example, formic acid, methanol and the like are important chemical raw materials and have high market value, but the formic acid, the methanol and the like have come to the presentThe source is fossil fuel, belongs to a high-carbon chemical process, and can play a certain role in carbon emission reduction in the chemical industry if a new low-carbon production method of formic acid and methanol can be explored.
On the whole, the current carbon dioxide trapping, utilization and sealing technologies have high cost and bring difficulties for carbon emission reduction of thermal power generation. Meanwhile, the dependence of the modern chemical raw material production process on fossil fuels is strong.
Disclosure of Invention
The invention aims to provide CO2A comprehensive energy system combining co-electrolysis and oxygen-enriched combustion power generation and a co-production method aim to solve the problems that the carbon dioxide capture, utilization and storage technology in the prior art is high in cost and brings difficulties to carbon emission reduction of thermal power generation.
The invention is realized by the following steps of2The comprehensive energy system for CO-electrolysis combined oxygen-enriched combustion power generation comprises a wind power or photovoltaic power generation system, a water electrolytic cell, an air separation device, an ammonia synthesis module, an oxygen-enriched combustion power generation module and CO2And H2O is shared with an electrolytic cell;
the electric energy output by the electric energy output port of the wind power or photovoltaic power generation system is divided into three branches which are respectively connected to the electric energy input port of the water electrolysis cell, the electric energy input port of the air separation device and the CO2And H2An electric energy input port of the O-common electrolytic cell;
the water inlet of the water electrolysis cell is connected with an external water source, the hydrogen outlet port of the water electrolysis cell is connected with the hydrogen inlet port of the ammonia synthesis module, and the oxygen outlet port of the water electrolysis cell is connected with the oxygen inlet port of the oxygen-enriched combustion power generation module;
the nitrogen output port of the air separation device is connected with the nitrogen input port of the ammonia synthesis module, and the oxygen output port of the air separation device is connected with the oxygen input port of the oxygen-enriched combustion power generation module;
the ammonia synthesis module is used for synthesizing ammonia from input nitrogen and hydrogen, and outputting the ammonia as one of system products;
the fuel input port of the oxygen-enriched combustion power generation module is used for inputting fossil fuelOxygen-enriched combustion, wherein chemical energy is converted into mechanical energy and then converted into electric energy, and the electric energy is used as a two-way output of a system product; high-temperature CO output by a tail gas output port of the oxygen-enriched combustion power generation module2And H2O gas is divided into two streams, one stream flows into a heat source input port of the water electrolysis cell, and the other stream flows into the CO together with tail gas from the water electrolysis cell after heat exchange after converging2And H2O is the raw material input port of the electrolytic cell;
said CO2And H2The water inlet of the O CO-electrolysis cell is connected with an external water source, CO2And H2The O is co-electrolyzed to generate hydrocarbon, and the hydrocarbon is output as a third output of the system product.
The invention also provides CO for realizing the purpose2The co-electrolysis combined oxygen-enriched combustion power generation co-production method comprises the following steps:
respectively connecting electric energy generated by a wind power or photovoltaic power generation system into a water electrolytic cell and an air separation device; the water is subjected to electrochemical reaction in the water electrolysis cell to generate hydrogen and oxygen, and the air is separated in the air separation device to generate nitrogen and oxygen; the generated oxygen is converged and enters the oxygen-enriched combustion power generation module to be used as a combustion improver;
introducing the hydrogen and the nitrogen into an ammonia synthesis module to synthesize ammonia, and outputting the ammonia serving as one of products;
oxygen and fossil fuel in the oxygen-enriched combustion power generation module are subjected to oxygen-enriched combustion, chemical energy is converted into mechanical energy and then converted into electric energy to be output, and the electric energy is used as a product and is output outwards; simultaneously generating high-temperature flue gas, wherein the components of the high-temperature flue gas comprise carbon dioxide and water vapor;
the high-temperature flue gas is divided into two streams, one stream is converged into converged flue gas after providing heat for the water electrolysis cell and the other stream, and the converged flue gas is introduced into CO2And H2The O co-electrolytic cell carries out co-electrolysis, and the electric energy is generated by a wind power or photovoltaic power generation system;
in CO2And H2In the O co-electrolytic cell, carbon dioxide and water vapor are converted into hydrocarbons and are output outwards as a product; CO 22And H2O is in commonThe external water source in the decomposition pool can adjust H2O and CO2The ratio controls the hydrocarbon generation process.
Further, the chemical reaction in the ammonia synthesis module is:
said CO2And H2In an O-co-electrolytic cell, when tin oxide is used as a catalyst, the chemical reaction is:
CO2+H2O+2e-→HCOO-+OH-
when cobalt phthalocyanine is used as the catalyst, the chemical reaction is as follows:
CO2+5H2O+6e-→CH3OH+6OH-。
further, the air separation device adopts a low-temperature air separation technology.
Furthermore, the water electrolysis cell adopts alkaline electrolysis water, proton exchange membrane electrolysis water or high-temperature solid oxide electrolysis water technology.
Further, by regulating the introduction of said CO2And H2H in O-common electrolytic cell2The amount of O to regulate CO for CO-electrolysis2And H2And the proportion of O, and further controlling the generation of a target product.
Further, said CO2And H2The hydrocarbon generated by the co-electrolysis of O is methanol or formic acid.
Compared with the prior art, the invention has the beneficial effects that:
the invention utilizes wind energy or solar energy to generate electricity to drive air to be separated into nitrogen and oxygen, drive water to be electrolyzed into hydrogen and oxygen, the generated oxygen is used as a combustion improver for combustion of fossil fuel, when fossil fuel fuels such as natural gas, coal and the like are used, chemical energy is converted into mechanical energy and then converted into electric energy to be output, and simultaneously high-temperature flue gas is generated, and only water vapor and CO are contained in the high-temperature flue gas2Can be directly introduced into the solid oxideThe electrolytic cell performs co-electrolysis to generate hydrocarbons such as methanol and formic acid.
The power source is wind energy or solar energy power generation, so that the emission of carbon dioxide is reduced. The hydrogen and the nitrogen can be used for synthesizing ammonia and output as a system product, thereby generating economic value. Hydrocarbons (such as methanol, formic acid and the like) are liquid at normal temperature, are convenient to store and transport, are important intermediate raw materials in a modern chemical system, convert a high-carbon process into a low-carbon process in the production process of the hydrocarbons, and realize high-valued resource utilization of carbon dioxide, so that the high cost of carbon emission reduction is offset, and the low-carbon high-efficiency reformation of a fossil fuel power generation system is facilitated.
Drawings
FIG. 1 shows a CO according to an embodiment of the present invention2The structural block diagram of the comprehensive energy system combining co-electrolysis and oxygen-enriched combustion power generation.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly and encompass, for example, both fixed and removable coupling as well as integral coupling; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Referring to FIG. 1, there is shown a CO provided in this embodiment2The comprehensive energy system for CO-electrolysis combined oxygen-enriched combustion power generation comprises a wind power or photovoltaic power generation system 1, a water electrolysis cell 2, an air separation device 3, an ammonia synthesis module 4, an oxygen-enriched combustion power generation module 5 and CO2And H2O is common to the electrolytic cell 6.
The electric energy output by the electric energy output port of the wind power or photovoltaic power generation system 1 is divided into three branches which are respectively connected to the electric energy input port of the water electrolytic cell 2, the electric energy input port of the air separation device 3 and the CO2And H2And O is shared with the electric energy input port of the electrolytic cell 4, thereby providing electric energy for water electrolysis, air separation and co-electrolysis.
The water inlet of the water electrolytic cell 2 is connected with an external water source, the hydrogen outlet port of the water electrolytic cell is connected with the hydrogen inlet port of the ammonia synthesis module 4, and the oxygen outlet port of the water electrolytic cell is connected with the oxygen inlet port of the oxygen-enriched combustion power generation module 5.
The nitrogen output port of the air separation device 3 is connected with the nitrogen input port of the ammonia synthesis module 4, and the oxygen output port of the air separation device is connected with the oxygen input port of the oxygen-enriched combustion power generation module 5.
The ammonia synthesis module 4 is used for synthesizing ammonia by inputting nitrogen and hydrogen, and outputting the ammonia as one of system products.
The fuel input port of the oxygen-enriched combustion power generation module 5 is used for inputting fossil fuel, the fossil fuel is subjected to oxygen-enriched combustion, chemical energy is converted into mechanical energy and then converted into electric energy, and the electric energy is used as a two-way output of a system product; high-temperature CO output by a tail gas output port of the oxygen-enriched combustion power generation module 52And H2The O gas is divided into two streams, one stream flows into the heat source input port of the water electrolytic cell 2, and the other stream flows into the CO together with the tail gas from the water electrolytic cell 2 after heat exchange after converging2And H2And O is used as a raw material input port of the electrolytic cell 6.
CO2And H2The water inlet of the O-common electrolytic cell 6 is connected with the outsideWater source, CO2And H2Co-electrolysis of O occurs to produce hydrocarbons (such as methanol or formic acid) which are exported as a third product of the system.
The operation flow for realizing the co-production by applying the comprehensive energy system of the embodiment is as follows:
s1, electric energy generated by the wind power or photovoltaic power generation system 1 respectively enters the water electrolytic cell 2 and the air separation device 3, water is subjected to electrochemical reaction in the water electrolytic cell 2 to generate hydrogen and oxygen, and air is subjected to electrochemical reaction in the air separation device 3 to generate nitrogen and oxygen; the generated oxygen is converged into the oxygen-enriched combustion power generation module 5 to be used as a combustion improver.
And S2, enabling the hydrogen and the nitrogen to flow into the ammonia synthesis module 4 to synthesize ammonia, and outputting the ammonia outwards as one of the multiple products of the system.
S3, oxygen in the oxygen-enriched combustion power generation module 5 and fossil fuels such as natural gas or coal are subjected to oxygen-enriched combustion, chemical energy is converted into mechanical energy and then converted into electric energy, and the electric energy is used as a two-way output of a multi-connected product of the system; simultaneously generating high-temperature flue gas; the main components of the high-temperature flue gas are carbon dioxide and water vapor.
S4, dividing the high-temperature flue gas into two streams, converging the two streams into converged flue gas after one stream provides heat for a water electrolysis cell, and introducing CO into the converged flue gas2And H2Co-electrolysis is carried out in the O co-electrolysis cell 6, and the electric energy is generated by a wind power or photovoltaic power generation system 1; at the CO2And H2In the O co-electrolytic cell 6, carbon dioxide and water vapor are converted into hydrocarbons and are output as a multi-connected product of the system.
Wherein, the chemical reaction in the ammonia synthesis module 4 is:
CO as described above2And H2In the O co-cell 6, when tin oxide is used as a catalyst, the chemical reaction is:
CO2+H2O+2e-→HCOO-+OH-
when cobalt phthalocyanine is used as a catalyst, the chemical reaction is as follows:
CO2+5H2O+6e-→CH3OH+6OH-。
in practical application, the air separation device 3 can adopt a low-temperature air separation technology, and the water electrolysis cell 2 can adopt an alkaline electrolysis water, proton exchange membrane electrolysis water or high-temperature solid oxide electrolysis water technology.
In addition, the introduction of CO can be regulated2And H2O-Co-electrolysis of H in cell 52The amount of O to regulate CO for CO-electrolysis2And H2And the proportion of O, and further controlling the generation of a target product.
In summary, in this embodiment, wind energy or solar energy is used to generate electricity to drive air to be separated into nitrogen and oxygen, drive water to be electrolyzed into hydrogen and oxygen, the generated oxygen is used as a combustion improver for fossil fuel combustion, when fossil fuel fuels such as natural gas and coal are used, chemical energy is converted into mechanical energy and then converted into electric energy to be output, and simultaneously high-temperature flue gas is generated, and only water vapor and CO are contained in the high-temperature flue gas2The solid oxide can be directly introduced into a solid oxide electrolytic cell for co-electrolysis to generate hydrocarbons such as methanol, formic acid and the like.
The power source is wind energy or solar energy power generation, so that the emission of carbon dioxide is reduced. The hydrogen and the nitrogen can be synthesized into ammonia which is output as a system product to the outside, thereby generating economic value. Hydrocarbon compounds such as methanol, formic acid and the like are liquid at normal temperature, are convenient to store and transport, are important intermediate raw materials in a modern chemical system, convert a high-carbon process into a low-carbon process in the production process of the hydrocarbon compounds, and realize high-valued resource utilization of carbon dioxide, so that the high cost paid by carbon emission reduction is offset, and the low-carbon high-efficiency reformation of a fossil fuel power generation system is facilitated.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. CO (carbon monoxide)2The comprehensive energy system for CO-electrolysis combined oxygen-enriched combustion power generation is characterized by comprising a wind power or photovoltaic power generation system, a water electrolysis cell, an air separation device, an ammonia synthesis module, an oxygen-enriched combustion power generation module and CO2And H2O is shared with an electrolytic cell;
the electric energy output by the electric energy output port of the wind power or photovoltaic power generation system is divided into three branches which are respectively connected to the electric energy input port of the water electrolytic cell, the electric energy input port of the air separation device and the CO2And H2An electric energy input port of the O-common electrolytic cell;
the water inlet of the water electrolysis cell is connected with an external water source, the hydrogen outlet port of the water electrolysis cell is connected with the hydrogen inlet port of the ammonia synthesis module, and the oxygen outlet port of the water electrolysis cell is connected with the oxygen inlet port of the oxygen-enriched combustion power generation module;
the nitrogen output port of the air separation device is connected with the nitrogen input port of the ammonia synthesis module, and the oxygen output port of the air separation device is connected with the oxygen input port of the oxygen-enriched combustion power generation module;
the ammonia synthesis module is used for synthesizing ammonia from input nitrogen and hydrogen, and outputting the ammonia as one of system products;
the fuel input port of the oxygen-enriched combustion power generation module is used for inputting fossil fuel, the fossil fuel is subjected to oxygen-enriched combustion, chemical energy is converted into mechanical energy and then converted into electric energy, and the electric energy is used as a two-way output of a system product; high-temperature CO output by a tail gas output port of the oxygen-enriched combustion power generation module2And H2O gas is divided into two streams, one stream flows into a heat source input port of the water electrolysis cell, and the other stream flows into the CO together with tail gas after heat exchange from the water electrolysis cell after confluence2And H2A raw material input port of the O-common electrolytic cell;
the CO is2And H2The water inlet of the O CO-electrolysis cell is connected with an external water source, CO2And H2The O is co-electrolyzed to generate hydrocarbon, and the hydrocarbon is output as a third output of the system product.
2. ACO as a seed2The co-electrolysis combined oxygen-enriched combustion power generation co-production method is characterized by comprising the following steps:
respectively connecting electric energy generated by a wind power or photovoltaic power generation system into a water electrolytic cell and an air separation device; the water is subjected to electrochemical reaction in the water electrolysis cell to generate hydrogen and oxygen, and the air is separated in the air separation device to generate nitrogen and oxygen; the generated oxygen is converged and enters the oxygen-enriched combustion power generation module to be used as a combustion improver;
introducing the hydrogen and the nitrogen into an ammonia synthesis module to synthesize ammonia, and outputting the ammonia serving as one of the products;
oxygen and fossil fuel in the oxygen-enriched combustion power generation module are subjected to oxygen-enriched combustion, chemical energy is converted into mechanical energy and then converted into electric energy to be output, and the electric energy is used as a product to be output outwards; simultaneously generating high-temperature flue gas, wherein the components of the high-temperature flue gas comprise carbon dioxide and water vapor;
the high-temperature flue gas is divided into two strands, one strand supplies heat to the water electrolysis cell and then converges with the other strand to form converged flue gas, and CO is introduced into the converged flue gas2And H2The O co-electrolytic cell performs co-electrolysis, and the electric energy is generated by a wind power or photovoltaic power generation system;
in CO2And H2In the O co-electrolytic cell, carbon dioxide and water vapor are converted into hydrocarbons and are output outwards as a third product; CO 22And H2External water source in O-electrolysis cell for regulating H2O and CO2The ratio controls the hydrocarbon generation process.
3. The co-production process of claim 2, wherein the chemical reaction in the ammonia synthesis module is:
the CO is2And H2In an O-co-electrolytic cell, when tin oxide is used as a catalyst, the chemical reaction is:
CO2+H2O+2e-→HCOO-+OH-
when cobalt phthalocyanine is used as the catalyst, the chemical reaction is as follows:
CO2+5H2O+6e-→CH3OH+6OH-。
4. the co-production process of claim 2, wherein the air separation plant employs cryogenic air separation technology.
5. The co-production method of claim 2, wherein the water electrolysis cell employs alkaline electrolysis water, proton exchange membrane electrolysis water or high temperature solid oxide electrolysis water technology.
6. The CO-production process of claim 2, wherein the CO is introduced by regulating the CO introduction2And H2H in O-common electrolytic cell2The amount of O to regulate CO for CO-electrolysis2And H2And the proportion of O, and further controlling the generation of a target product.
7. The CO-production process of claim 6, wherein the CO2And H2The hydrocarbon produced by co-electrolysis of O is methanol or formic acid.
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| CN115750017B (en) * | 2022-11-30 | 2024-05-24 | 国家电投集团科学技术研究院有限公司 | Liquid air energy storage coupling ammonia production power generation system and method |
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