CN111947140A - Based on supercritical CO2Cogeneration system for coupling chemical looping combustion and supercritical hydrothermal reaction and working method - Google Patents
Based on supercritical CO2Cogeneration system for coupling chemical looping combustion and supercritical hydrothermal reaction and working method Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C99/00—Subject-matter not provided for in other groups of this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The invention relates to a supercritical CO-based catalyst2A combined heat and power generation system for coupling chemical looping combustion and supercritical hydrothermal reaction and a working method thereof. At present, no chemical looping combustion system based on supercritical CO with high energy utilization efficiency exists2Coupled chemical looping combustion and supercritical hydrothermal reactionThe cogeneration system of (1). The invention comprises a chemical looping combustion system, a coal water slurry system and a thermoelectric generation system; it is characterized in that: the system also comprises a supercritical water oxidation system, wherein the supercritical water oxidation system comprises a high-pressure water coal slurry pump, a supercritical water thermal reactor, a preheater and CO2Separator and N2The system comprises a tank, a high-pressure water coal slurry pump and a water coal slurry system, wherein the preheater is connected with a supercritical water thermal reactor, and the supercritical water thermal reactor is respectively connected with the high-pressure water coal slurry pump and the CO through pipelines2The separator is connected with a cyclone separator, N2The tanks are respectively connected with CO through pipelines2The separator is connected to the thermoelectric generation system. The chemical looping combustion system has high energy utilization rate, and oxygen carrier particles are not easy to sinter in chemical looping combustion.
Description
Technical Field
The invention relates to a supercritical CO-based catalyst2A combined heat and power generation system for coupling chemical looping combustion and supercritical hydrothermal reaction and a working method belong to the technical field of carbon emission reduction and energy.
Background
Since industrial civilization, CO in the earth's atmosphere2The concentration rises sharply due to human production activities. CO 22As a typical greenhouse gas, it directly causes the greenhouse effect. At present, supercritical CO2Power generation is the control of CO2A novel utilization technique of the emissions in supercritical state of CO2The energy of the heat source is converted into mechanical energy as working medium. Because the supercritical carbon dioxide has the characteristics of large energy density, high heat transfer efficiency and the like, a power generation system using the supercritical carbon dioxide as a working medium can reach the efficiency of the conventional steam Rankine cycle at 700 ℃ within the temperature range of 620 ℃, and is widely popular among researchers in various countries.
From the energy sourceFrom the structural point of view, because the situation that human beings use fossil energy as main energy does not change in a short period, especially in China, coal occupies an absolute leading position from the reserve composition to the energy consumption system, how to make the energy system environment-friendly and separate CO is the main reason2While improving the utilization efficiency of the system, the method controls CO2The main objective of energy system research on emissions. For example, Chinese patent publication No. CN106321177A, published as 2017, 01, 11 and public disclosure No. CN106321177A, discloses a method for realizing CO2Separated and captured supercritical CO2Provided are a power generation device and a power generation method.
The chemical chain combustion of coal is a new combustion technology, fuel is not directly contacted with air for combustion, but the oxygen transfer is realized through the alternate oxidation-reduction reaction of the oxygen carrier between the air reactor and the fuel reactor, and the conversion process of the chemical energy of the fuel is completed. H from the fuel reactor as the fuel reacts with the solid oxygen carrier particles in the fuel reactor2O and CO2Is not covered by N2Dilution, CO2High concentration, no need of special CO2Separating equipment for removing water vapor by simple condensation to obtain almost pure CO2Realizing zero energy consumption to separate CO2Meanwhile, the grade of the fuel is reduced to the grade of the reduced metal simple substance (or low-valence metal oxide), so that the combustion loss is reduced, and the combustion efficiency of the fuel is improved. For example, chinese patent publication No. CN106438043A, published as 2017, 02, 22, discloses a system and method for generating electricity by chemical looping combustion of coal-based fuel based on supercritical carbon dioxide.
The supercritical hydrothermal reaction of coal utilizes the special property of supercritical water, coal and oxygen are completely dissolved mutually in the supercritical water to form a homogeneous reaction system, the coal is thoroughly oxidized in extremely short reaction time to release a large amount of heat, and the final product is CO2、H2O、N2Etc. is free of harmful substances and SO2、NOxAnd the like, and has obvious environmental protection advantages. The technology belongs to a novel clean coal combustion technology and accords with the current international development trend of energy conservation and emission reduction. With incineration method, wet air oxidationCompared with the method, the supercritical water oxidation technology has the advantages of no need of catalyst, short retention time, high removal efficiency, cleanness, broad spectrum and the like.
At present, a supercritical CO-based fuel oil combustion system which can improve the energy utilization efficiency of a chemical looping combustion system and can simultaneously relieve the problem that oxygen carrier particles are easy to sinter in chemical looping combustion does not exist2A combined heat and power generation system for coupling chemical looping combustion and supercritical hydrothermal reaction and a working method thereof.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the supercritical CO-based fuel-based combustion system which is reasonable in structural design, can improve the energy utilization efficiency of the chemical looping combustion system, and can simultaneously relieve the problem that oxygen carrier particles are easy to sinter in chemical looping combustion2A combined heat and power generation system for coupling chemical looping combustion and supercritical hydrothermal reaction and a working method thereof.
The technical scheme adopted by the invention for solving the problems is as follows: the supercritical CO-based2The combined heat and power generation system comprises a chemical looping combustion system, a coal water slurry system and a heat and power generation system, wherein the chemical looping combustion system is coupled with the supercritical hydrothermal reaction; the chemical looping combustion system comprises an air reactor, a pyrolysis furnace, a fuel reactor and a cyclone separator, wherein the pyrolysis furnace is connected with the air reactor, the fuel reactor is respectively connected with the air reactor and the pyrolysis furnace through pipelines, and the cyclone separator is respectively connected with the air reactor and the fuel reactor through pipelines; the coal water slurry system is respectively connected with the chemical looping combustion system and the thermoelectric generation system; the structure is characterized in that: the system also comprises a supercritical water oxidation system, wherein the supercritical water oxidation system comprises a high-pressure water coal slurry pump, a supercritical water thermal reactor, a preheater and CO2Separator and N2A tank, high pressure water coal slurry pump and coal slurry system connection, the pre-heater is connected with supercritical water thermal reactor, supercritical water thermal reactor pass through the pipeline respectively with high pressure water coal slurry pump, CO2The separator is connected with a cyclone separator, and N is2The tanks are respectively connected with CO through pipelines2The separator is connected to the thermoelectric generation system.
Furthermore, the coal water slurry system comprises coal grinding equipment, a water storage tank, a water pump, a mixing tank, a colloid mill and a slurry storage tank, wherein the water storage tank, the water pump, the mixing tank, the colloid mill, the slurry storage tank and a high-pressure water coal slurry pump are sequentially connected, the thermoelectric generation system is connected with the water storage tank, and the coal grinding equipment is respectively connected with the pyrolysis furnace and the mixing tank through pipelines.
Furthermore, the thermoelectric generation system comprises a heat exchanger, a compressor, a heat regenerator, a primary turbine, a first generator, a second generator, a secondary turbine and a waste heat boiler, wherein the fuel reactor, the heat exchanger, the compressor, the heat regenerator, the primary turbine, the secondary turbine and the waste heat boiler are sequentially connected, the primary turbine drives the first generator, the secondary turbine drives the second generator, and the supercritical hydrothermal reactor is connected to a pipeline between the primary turbine and the secondary turbine through a pipeline.
Furthermore, the upper part of the pyrolysis furnace and the upper part of the air reactor are connected through a prefabricated steel plate I, the prefabricated steel plate I is made of high-chromium cast iron made of a mixed matrix of 3% graphite and M7C3 type carbide, the thickness of the prefabricated steel plate I is 3mm, the periphery of the prefabricated steel plate I is sealed by high-temperature refractory bricks, heat generated in the air reactor is guaranteed to be transferred to the pyrolysis furnace in a heat conduction mode, and auxiliary electric heating wires are embedded in the wall body of the periphery of the pyrolysis furnace.
Furthermore, the preheater and the supercritical water thermal reactor are connected through a second prefabricated steel plate, the second prefabricated steel plate is made of high-chromium cast iron made of 3% graphite and M7C3 type carbide mixed matrix, the thickness of the second prefabricated steel plate is 2mm, and the periphery of the second prefabricated steel plate is sealed by refractory bricks, so that heat generated in the supercritical water thermal reactor is transferred to the preheater in a heat conduction mode.
Based on supercritical CO2The working method of the combined heat and power generation system for coupling the chemical looping combustion and the supercritical hydrothermal reaction is characterized in that: the working method comprises a chemical looping combustion step, a coal water slurry preparation step, a supercritical water oxidation reaction step and a thermoelectric generation step, wherein the chemical looping combustion step comprises the following steps:
under inert atmosphere, coal powder enters a pyrolysis furnace, on one hand, the coal powder receives heat conducted by a first prefabricated steel plate from an air reactor, on the other hand, the coal powder is heated by auxiliary electric heating wires embedded around, the coal powder is fully pyrolyzed under the action of the heat of the two parts, and pyrolysis products comprise gas products and residual solid residual coke;
the gas product of pyrolysis enters the fuel reactor through a fuel inlet at the bottom of the fuel reactor and is subjected to reduction reaction with the metal oxygen carrier to generate flue gas CO2、H2O enters the thermoelectric generation system through the output of the top gas outlet, condensed water enters the water storage tank, and CO enters the water storage tank2Is used to generate electricity; the reduced metal oxygen carrier enters the air reactor through an oxygen carrier outlet on the side surface of the bottom, and is subjected to oxidation reaction with air entering through an air inlet on the bottom, and then the oxidized oxygen carrier enters the cyclone separator under the carrying of flue gas;
the oxygen carrier and the flue gas realize gas-solid separation in the cyclone separator, and the separated oxygen carrier enters the fuel reactor through a bottom dipleg of the cyclone separator, so that one-time circulation of the metal oxygen carrier is completed.
Further, the preparation steps of the coal water slurry are as follows:
the residual solid residual coke after pyrolysis enters coal grinding equipment, under the action of a coke ring roller mill, the powdery residual coke is output from the coal grinding equipment, enters a mixing tank through a coal powder input port, and is premixed with water output by a water storage tank under the action of a stirrer; the colloidal fluid formed by the residual coke and the water enters the colloid mill through the output port of the mixing tank, is further uniformly mixed under the high-speed rotation of the rotating teeth and the fixed teeth to prepare the coal water slurry, and enters the slurry storage tank.
Furthermore, the supercritical water oxidation reaction steps of the invention are as follows:
pressurizing the coal water slurry in the slurry storage tank to working pressure by a high-pressure water coal slurry pump, pumping the coal water slurry into a supercritical water thermal reactor, and sequentially reacting fuel with primary air from a preheater and secondary air from a gas outlet at the top of a cyclone separator, wherein the primary air is conducted heat conducted by the supercritical water thermal reactor through a second prefabricated steel plate in the preheater by airFormed after heating; the flue gas generated by the reaction is divided into two parts and is output through a top gas outlet, wherein one part is output to CO through a first branch2Separator, pure CO2Enters a compressor of the thermoelectric generation system, and the other part of the thermoelectric generation system is output to a secondary turbine of the thermoelectric generation system through a second branch.
Further, the thermoelectric generation steps of the present invention are as follows:
the flue gas is output from a gas outlet at the top of the fuel reactor, enters a heat exchanger to exchange heat with cold water from a user, water condensed from the flue gas after heat release enters a water storage tank, and separated CO2Is output through the flue gas outlet and comes from CO2CO of the separator2Mixing, compressing in compressor to 30MPa and high-pressure CO2Then enters a heat regenerator to absorb heat to generate flue gas at 700 ℃;
30MPa, 700 ℃ supercritical CO2The power enters a first-stage turbine to do work and drive a first generator to generate power for users to use; after work is done, part of dead steam is pumped back to enter a heat regenerator for circulation, the other part of dead steam is mixed with flue gas output by a second branch from a top gas outlet of the supercritical water thermal reactor to enter a secondary turbine for work, a second generator is driven to generate power, and the dead steam enters a waste heat boiler for supplying heat to users.
Furthermore, the temperature of the air reactor after heating the pyrolysis furnace is 850-950 ℃, and the temperature of the supercritical water reactor after heating the preheater is 450-600 ℃.
Compared with the prior art, the invention has the following advantages and effects: not only can improve the economy and the energy utilization efficiency of the chemical looping combustion system, but also can relieve the technical problems that oxygen carrier particles are easy to sinter and the like in the chemical looping combustion, and can capture CO with low cost and low energy consumption2And then recycled. In addition, the conversion and utilization of chemical energy in coal are improved, and the environment is protected and the emission is reduced.
The supercritical hydrothermal reaction of coal utilizes the special property of supercritical water, coal and oxygen are completely dissolved mutually in the supercritical water to form a homogeneous reaction system, and the coal is completely oxidized in extremely short reaction time to release large amount of oxygenAmount of heat, the final product being CO2、H2O、N2Etc. is free of harmful substances and SO2、NOxAnd the like, and has obvious environmental protection advantages. The method conforms to the current international development trend of energy conservation and emission reduction. Compared with the incineration method and the wet air oxidation method, the supercritical water oxidation technology has the advantages of no need of a catalyst, short retention time, high removal efficiency, cleanness, broad spectrum and the like.
Better CO is obtained due to chemical chain combustion and supercritical hydrothermal reaction2Emission reduction effect and higher combustion efficiency, thus based on supercritical CO2The combustion power system which couples chemical looping combustion, supercritical hydrothermal reaction and thermodynamic cycle by circulation breaks through the CO control by an energy system2The technical problem of separation is solved, the conversion and utilization of chemical energy are improved, and CO is reduced2Separate investment and energy consumption.
The invention effectively utilizes the carbon dioxide generated by chemical looping combustion and supercritical hydrothermal reaction to provide stable and reliable carbon dioxide supply for the supercritical carbon dioxide Brayton cycle power generation system, thereby achieving the purpose of supplying CO2The purposes of emission reduction and power generation. Meanwhile, the waste heat boiler supplies heat to the user by using the waste heat of the supercritical carbon dioxide Brayton cycle power generation system, effectively utilizes the waste heat and improves the heat efficiency of the system. The oxidation-reduction reaction of the pyrolysis gas product of the coal and the oxygen carrier is taken as a standard, so that the direct contact between the coal and the solid of the oxygen carrier is avoided, the influence of the coal ash on the reaction performance of the oxygen carrier along with the cyclic reaction is avoided, and the possibility of poisoning of the oxygen carrier is reduced. Preheating the entering air by using the heat released by the supercritical water oxidation reactor, and reducing the heat loss of the water oxidation reaction; the introduction of primary air and secondary air enables the fuel to react fully, realizes the energy gradient utilization of the whole system, and accords with the current policy of energy conservation and emission reduction.
The chemical looping combustion and the supercritical water oxidation reaction are complementarily integrated, so that the reasonable and efficient utilization of the solid fuel is realized, the gas product and the solid residual coke of the coal pyrolysis are respectively used as fuels of the chemical looping combustion and the supercritical water oxidation reaction, and water formed by condensation in the process is used as one of the components of the coal water slurry.
Drawings
In order to more clearly illustrate the embodiments and/or technical solutions of the present invention, the drawings used in the description of the embodiments and/or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 shows supercritical CO-based data in example 1 of the present invention2The structural schematic diagram of the combined heat and power generation system for coupling chemical looping combustion and supercritical hydrothermal reaction.
FIG. 2 shows the supercritical CO-based control in comparative example 12The structural schematic diagram of the combined heat and power generation system for coupling chemical looping combustion and supercritical hydrothermal reaction.
In the figure: air reactor 1, pyrolysis furnace 2, fuel reactor 3, cyclone 4, prefabricated steel sheet 5, coal grinding equipment 6, reservoir 7, water pump 8, mixing tank 9, colloid mill 10, slurry storage tank 11, high-pressure water coal slurry pump 12, supercritical water thermal reactor 13, preheater 14, CO2Separator 15, N2The system comprises a tank 16, a second prefabricated steel plate 17, a heat exchanger 18, a compressor 19, a heat regenerator 20, a first-stage turbine 21, a first generator 22, a second generator 23, a second-stage turbine 24 and a waste heat boiler 25.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Example 1.
Referring to FIG. 1, the present invention is based on supercritical CO2The combined heat and power generation system for the cyclic coupling of chemical looping combustion and supercritical hydrothermal reaction comprises a chemical looping combustion system, a supercritical hydrothermal oxidation system, a coal water slurry system and a thermoelectric generation system.
The chemical looping combustion system comprises an air reactor 1, a pyrolysis furnace 2, a fuel reactor 3 and a cyclone separator 4, wherein the air reactor 1 comprises 3 interfaces which are respectively a bottom air inlet, an oxygen carrier inlet on the side surface of the bottom and a top outlet.
The fuel reactor 3 comprises 4 interfaces, which are respectively a bottom fuel inlet, an oxygen carrier outlet on the side surface of the bottom, a gas outlet on the top and an oxygen carrier inlet on the top.
The cyclone 4 comprises 3 connections, respectively a side tangential inlet, a top gas outlet and a bottom dipleg.
The coal water slurry system consists of coal grinding equipment 6, a water storage tank 7, a water pump 8, a mixing tank 9, a colloid mill 10 and a slurry storage tank 11.
The coal grinding apparatus 6 may be a coke ring roll mill manufactured by Shanghai Colelix machines, Inc. capable of efficiently grinding residual coke from the pyrolysis furnace 2 into powder.
The mixing tank 9 comprises 3 connectors which are respectively a water delivery inlet, a coal powder input port and an output port, the water delivery inlet of the mixing tank 9 is connected with the water outlet of the water storage tank 7, and the coal powder inlet is connected with the coal grinding equipment 6. The mixing tank 9 is internally provided with a stirrer for premixing water and pulverized coal.
The output port of the mixing tank 9 is connected with a colloid mill 10, and the colloid mill 10 is connected with a slurry storage tank 11. The colloid mill 10 is provided with rotating teeth and fixed teeth, and can rotate at a high speed to uniformly mix the water-coal mixture from the mixing tank 9, so as to achieve the purpose of homogenization and prepare the water-coal-slurry.
The supercritical hydrothermal reaction system comprises a high-pressure water coal slurry pump 12, a supercritical hydrothermal reactor 13, a preheater 14 and CO2Separator 15, N2Tank 16.
Supercritical thermal reactor 13 includes 4 interfaces, includingA primary air inlet, a secondary air inlet, a coal water slurry inlet and a top gas outlet. The primary air inlet is positioned at the bottom of the supercritical thermal reactor 13 and is connected with the preheater 14. The secondary air inlet is positioned in the middle of the side surface of the reactor 13 and is connected with the top gas outlet of the cyclone separator 4, the coal water slurry inlet is connected with the high-pressure water coal slurry pump 12, the top gas outlet is provided with two branches, the first branch is connected with CO2The separators 15 are connected and the second branch is connected to the thermoelectric generation system.
CO2Separator 15 has two outlets, one of which is connected to N2 tank 16 and the other of which is connected to the thermoelectric generation system.
The preheater 14 has 2 interfaces including an air inlet connected to the outside atmosphere and an air outlet connected to the primary air inlet of the supercritical thermal reactor 13.
The preheater 14 is connected with the supercritical water thermal reactor 13 through a second prefabricated steel plate 17, the second prefabricated steel plate 17 is made of high-chromium cast iron made of 3% graphite and M7C3 type carbide mixed matrix, is 2mm thick, and is sealed with refractory bricks at the periphery to ensure that heat generated in the supercritical water thermal reactor 13 is transferred to the preheater 14 in a heat conduction mode.
The thermoelectric generation system consists of a heat exchanger 18, a compressor 19, a heat regenerator 20, a first-stage turbine 21, a first generator 22, a second generator 23, a second-stage turbine 24 and a waste heat boiler 25.
The heat exchanger 18 has 5 interfaces including a flue gas inlet, a flue gas outlet, a water outlet, a user water inlet, and a user water outlet, the flue gas inlet is connected to the top gas outlet of the fuel reactor 3, the flue gas outlet is connected to the compressor 19, and the water outlet is connected to the water storage tank 7.
The compressor 19 has 2 inlets, one of which is connected to the flue gas outlet of the heat exchanger 18 and the other of which is connected to the CO2The separator 15 is connected, and the outlet of the compressor 19 is connected with the heat regenerator 20; the heat of regenerator 20 may be derived from externally assisted electrical heating.
One outlet of the primary turbine 21 is connected to the secondary turbine 24, and the other outlet is connected to the inlet of the regenerator 20, and the primary turbine 21 drives the first generator 22 to rotate to generate power.
The secondary turbine 24 comprises two inlets, one of the inlets is connected with the primary turbine 21, the other inlet is connected with the second branch of the top gas outlet of the supercritical water thermal reactor 13, the outlet of the secondary turbine 24 is connected with the waste heat boiler 25, and the secondary turbine 24 drives the second generator 23 to rotate to generate power.
Supercritical CO-based catalyst in the present invention2The working method of the heat and power cogeneration system for circularly coupling chemical looping combustion and supercritical hydrothermal reaction according to the flowing of fuel and gas is as follows:
1. chemical looping combustion process:
under inert atmosphere, the pulverized coal enters the pyrolysis furnace 2, receives heat conducted by the first prefabricated steel plate 5 from the air reactor 1 on one hand, and receives heating from auxiliary electric heating wires embedded around on the other hand, the pulverized coal is fully pyrolyzed under the action of the two parts of heat, and pyrolysis products comprise gas products and residual solid residual coke.
Gaseous products of pyrolysis (CH)4CO, etc.) enters the fuel reactor 3 through a fuel inlet at the bottom of the fuel reactor 3 and performs reduction reaction with the metal oxygen carrier to generate flue gas CO2、H2O enters the thermoelectric generation system through the output of the top gas outlet, condensed water enters the water storage tank 7, and CO enters the water storage tank2Is used to generate electricity; the reduced metal oxygen carrier enters the air reactor 1 through an oxygen carrier outlet on the side surface of the bottom, and is subjected to oxidation reaction with air entering through an air inlet on the bottom, and then the oxidized oxygen carrier enters the cyclone separator 4 under the carrying of flue gas.
Oxygen carrier and flue gas (the main component is N)2、O2) Gas-solid separation is realized in the cyclone separator 4, and the separated oxygen carrier enters the fuel reactor 3 through a bottom dipleg of the cyclone separator 4, so that one-time circulation of the metal oxygen carrier is completed.
2. The preparation process of the coal water slurry comprises the following steps:
and the residual solid residual coke after pyrolysis enters the coal grinding equipment 6, and under the action of the coke ring roller mill, the powdery residual coke is output from the coal grinding equipment 6, enters the mixing tank 9 through the coal powder input port, and is premixed with the water output by the water storage tank 7 under the action of the stirrer. The colloidal fluid formed by the residual coke and the water enters a colloid mill 10 through an output port of a mixing tank 9, is further uniformly mixed under the high-speed rotation of the rotating teeth and the fixed teeth to prepare coal water slurry, and enters a slurry storage tank 11.
3. Supercritical water oxidation reaction process:
the high-pressure water coal slurry pump 12 pressurizes the coal slurry in the slurry storage tank 11 to working pressure, the coal slurry is pumped into the supercritical water thermal reactor 13, fuel reacts with primary air from the preheater 14 and secondary air (flue gas) from a gas outlet at the top of the cyclone separator 4 in sequence, and the primary air is formed after air is preheated in the preheater 14 by the supercritical water thermal reactor 13 through heat conduction of a second prefabricated steel plate 17. Flue gas (H) generated by reaction2O、N2、CO2) Is divided into two parts and output through a top gas outlet, wherein one part is output to CO through a first branch2Separator 15, pure CO2Enters the compressor 19 of the thermoelectric generation system and the other part is output to the secondary turbine 24 of the thermoelectric generation system through the second branch.
4. And (3) thermoelectric generation process:
flue gas (CO)2、H2O) is output from a gas output port at the top of the fuel reactor 3, enters a heat exchanger 18 to exchange heat with cold water from a user, water condensed from flue gas after heat release enters a water storage tank 7, and separated CO2Is output through the flue gas outlet and comes from CO2CO of separator 152Mixing, compressing in compressor 19 to 30MPa, and compressing to high pressure CO2Then enters a heat regenerator 20 to absorb heat to generate flue gas with the temperature of 700 ℃.
30MPa, 700 ℃ supercritical CO2The power enters a first-stage turbine 21 to do work and drive a first generator 22 to generate power for users to use; after work is done, part of dead steam is pumped back to enter the heat regenerator 20 for circulation, and the other part of dead steam is connected with flue gas (CO) output by a second branch of a top gas outlet of the supercritical water thermal reactor 132、H2O、N2) The mixture enters a secondary turbine 24 to do work and drive a second generator 23 to generate power, and the exhaust steam enters the waste heatThe boiler 25 supplies heat to the user.
Comparative example 1.
Referring to fig. 2, a supercritical CO-based catalyst2A combined heat and power generation system for circularly coupling chemical looping combustion and supercritical hydrothermal reaction comprises a chemical looping combustion system, a coal water slurry system and a heat and power generation system.
The chemical looping combustion system comprises an air reactor 1, a pyrolysis furnace 2, a fuel reactor 3 and a cyclone separator 4, wherein the air reactor 1 comprises 3 interfaces which are respectively a bottom air inlet, an oxygen carrier inlet on the side surface of the bottom and a top outlet.
The fuel reactor 3 comprises 4 interfaces, which are respectively a bottom fuel inlet, an oxygen carrier outlet on the side surface of the bottom, a top gas outlet and an oxygen carrier inlet on the top.
The cyclone 4 comprises 3 connections, respectively a side tangential inlet, a top gas outlet and a bottom dipleg.
The coal water slurry system consists of coal grinding equipment 6, a water storage tank 7, a water pump 8, a mixing tank 9, a colloid mill 10 and a slurry storage tank 11.
The coal grinding apparatus 6 may be a coke ring roll mill manufactured by Shanghai Colelix machines, Inc. capable of efficiently grinding residual coke from the pyrolysis furnace 2 into powder.
The mixing tank 9 comprises 3 connectors which are respectively a water delivery inlet, a coal powder input port and an output port, the water delivery inlet of the mixing tank 9 is connected with the water outlet of the water storage tank 7, and the coal powder inlet is connected with the coal grinding equipment 6. The mixing tank 9 is internally provided with a stirrer for premixing water and pulverized coal.
The output port of the mixing tank 9 is connected with a colloid mill 10, and the colloid mill 10 is connected with a slurry storage tank 11. The colloid mill 10 is provided with rotating teeth and fixed teeth, and can rotate at a high speed to uniformly mix the water-coal mixture from the mixing tank 9, so as to achieve the purpose of homogenization and prepare the water-coal-slurry.
The thermoelectric generation system consists of a heat exchanger 18, a compressor 19, a heat regenerator 20, a first-stage turbine 21, a first generator 22, a second generator 23, a second-stage turbine 24 and a waste heat boiler 25.
The heat exchanger 18 is provided with 5 interfaces comprising a flue gas inlet, a flue gas outlet, a water outlet, a user water inlet and a user water outlet, wherein the flue gas inlet is connected with a gas outlet at the top of the fuel reactor 3, the flue gas outlet is connected with a compressor 19, and the water outlet is connected with the water storage tank 7;
the inlet of the compressor 19 is connected to the flue gas outlet of the heat exchanger 18, and the outlet of the compressor 19 is connected to the regenerator 20.
One outlet of the primary turbine 21 is connected to the secondary turbine 24, and the other outlet is connected to the inlet of the regenerator 20, and the primary turbine 21 drives the first generator 22 to rotate to generate power.
The inlet of the secondary turbine 24 is connected with the primary turbine 21, the outlet is connected with the waste heat boiler 25, and the secondary turbine 24 drives the second generator 23 to rotate to generate electricity.
The above-mentioned supercritical CO-based2The working method of the heat and power cogeneration system for circularly coupling chemical looping combustion and supercritical hydrothermal reaction according to the flowing of fuel and gas is as follows:
1. chemical looping combustion process:
under inert atmosphere, the pulverized coal enters the pyrolysis furnace 2, receives heat conducted by the first prefabricated steel plate 5 from the air reactor 1 on one hand, and receives heating from auxiliary electric heating wires embedded around on the other hand, the pulverized coal is fully pyrolyzed under the action of the two parts of heat, and pyrolysis products comprise gas products and residual solid residual coke.
Gaseous products of pyrolysis (CH)4CO, etc.) enters the fuel reactor 3 through a fuel inlet at the bottom of the fuel reactor 3 and performs reduction reaction with the metal oxygen carrier to generate flue gas CO2、H2O is output from the top gas outlet and enters the thermoelectric generation systemThe condensed water enters the water storage tank 7, and CO2Is used to generate electricity; the reduced metal oxygen carrier enters the air reactor 1 through an oxygen carrier outlet on the side surface of the bottom, and is subjected to oxidation reaction with air entering through an air inlet on the bottom, and then the oxidized oxygen carrier enters the cyclone separator 4 under the carrying of flue gas.
Oxygen carrier and flue gas (the main component is N)2、O2) Gas-solid separation is realized in the cyclone separator 4, and the separated oxygen carrier enters the fuel reactor 3 through a bottom dipleg of the cyclone separator 4, so that one-time circulation of the metal oxygen carrier is completed.
2. The preparation process of the coal water slurry comprises the following steps:
and the residual solid residual coke after pyrolysis enters the coal grinding equipment 6, and under the action of the coke ring roller mill, the powdery residual coke is output from the coal grinding equipment 6, enters the mixing tank 9 through the coal powder input port, and is premixed with the water output by the water storage tank 7 under the action of the stirrer. The colloidal fluid formed by the residual coke and the water enters a colloid mill 10 through an output port of a mixing tank 9, is further uniformly mixed under the high-speed rotation of the rotating teeth and the fixed teeth to prepare coal water slurry, and enters a slurry storage tank 11.
3. And (3) thermoelectric generation process:
flue gas (CO)2、H2O) is output from a top gas output port of the fuel reactor 3, enters a heat exchanger 18 to exchange heat with cold water from a user, water condensed from flue gas after heat release enters a water storage tank 7, and separated CO2Then the gas is output through a flue gas outlet and enters a compressor 19 to be compressed to 30MPa, and high-pressure CO is obtained2Then enters a heat regenerator 20 to absorb heat to generate flue gas with the temperature of 700 ℃.
30MPa, 700 ℃ supercritical CO2The power enters a first-stage turbine 21 to do work and drive a first generator 22 to generate power for users to use; after working, a part of the exhaust steam is pumped back to enter the heat regenerator 20 for circulation, the other part of the exhaust steam enters the secondary turbine 24 for working, the second generator 23 is driven to generate electricity, and the outlet exhaust steam enters the waste heat boiler 25 for supplying heat to users.
The above example 1 and comparative example 1 were subjected to simulation calculation, and the ambient pressure and temperature were 22 ℃ and 0.10MPa, respectively.N of inert atmosphere used in the pyrolysis furnace 2 in the simulation calculation2From N in the system2The fuel used in the tank was referred to "Shenmu" coal, which had the composition and calorific value shown in Table 1, and the coal feed rate of the pyrolysis furnace 2 was 0.4 kg/s. The reaction temperature of the air reactor is 900 ℃, and the reaction temperature of the fuel reactor is 800 ℃; the simulation parameter settings are shown in table 2.
TABLE 1 composition (mass ratio,%) and calorific value of fuel coal
| C | H | O | N | S | Mar | Aar | Var | LHV | |
| Shenmu coal | 74.66 | 4.62 | 11.17 | 0.97 | 0.46 | 12.80 | 7.08 | 31.98 | 28.94 |
TABLE 2 basic cycle parameters of the System
In order to comprehensively and reasonably evaluate the system performance, the system performance is analyzed by adopting the thermal efficiency based on the first law of thermodynamics, and the finally obtained system thermodynamic performance is as shown in the following table 3:
TABLE 3 comparison of thermal properties
| Comparative example 1 | Example 1 | |
| Coal conveying calorific value (KW) | 152 | 152 |
| Electric energy consumption (KW h) | 17 | 30 |
| Output power (KW) | 94.64 | 131.04 |
| System thermal efficiency (%) | 56 | 72 |
Table 3 calculation formula: the heat efficiency of the system is the system output work/(the heat value of the fire coal and the electric energy consumption).
As can be seen from Table 3 above, the supercritical CO-based simulation was performed under the simulated conditions2The combined heat and power generation system with the cycle coupling chemical looping combustion and supercritical hydrothermal reaction consumes 152kw of fire coal, consumes 30kwh of electric energy, outputs 131.04kw of work, and has 72% of thermal efficiency in example 1 and 56% of thermal efficiency in comparative example 1.
The fundamental reason for analyzing the above-mentioned significant improvement in thermal efficiency is that: firstly, carbon dioxide generated by chemical looping combustion and supercritical hydrothermal reaction is effectively utilized to provide stable and reliable carbon dioxide supply for a supercritical carbon dioxide Brayton cycle power generation system. In addition, the pyrolysis furnace 2 and the preheater are respectively heated by heat generated by chemical looping combustion and supercritical hydrothermal reaction, so that on one hand, the heat loss is reduced, and on the other hand, the sintering of an oxygen carrier is reduced; the flue gas waste heat of the chemical-looping combustion fuel reactor is used for supplying heat to users, and the exhaust gas waste heat of the secondary turbine 24 is used for heating a waste heat boiler 25 to supply heat to the users; and the pyrolysis gas product of coal is used as fuel in chemical looping combustion, and the coal water slurry prepared from residual coke after coal pyrolysis is used as fuel in supercritical hydrothermal reaction, so that the combustion efficiency is extremely high, and the combustion loss is reduced.
Secondly, the redox reaction between the pyrolysis gas product of the chemical looping combustion coal and the oxygen carrier in the embodiment 1 is based, so that the direct contact between the coal and the solid of the oxygen carrier is avoided, the influence of the coal ash on the reaction performance of the oxygen carrier along with the cyclic reaction is avoided, and the possibility of poisoning the oxygen carrier is reducedPerformance; in addition, the flue gas separated by the cyclone separator 4 has higher temperature, reaches the working temperature of the supercritical water oxidation reaction, and can be directly introduced into the supercritical water oxidation reaction as secondary air of the oxidation reactor without an additional preheater. Meanwhile, N in the inert atmosphere of the pyrolysis furnace 22N from supercritical hydrothermal reaction2And the water condensed in the process is used for preparing the coal water slurry, so that the energy gradient utilization of the whole system is realized.
The invention takes the oxidation-reduction reaction of the pyrolysis gas product of the coal and the oxygen carrier as the standard, avoids the direct solid-solid contact of the coal and the oxygen carrier, also avoids the influence of the coal ash on the reaction performance of the oxygen carrier along with the cyclic reaction, and reduces the possibility of the poisoning of the oxygen carrier. And the heat released by the oxidation reaction in the air reactor is utilized to heat the fuel in the pyrolysis furnace, so that the heat loss of the air reactor is reduced, the reaction temperature is reduced, the melting and sintering characteristics of the oxygen carrier are reduced, and the reaction life of the oxygen carrier is prolonged. In addition, the flue gas that cyclone 4 separated has higher temperature, has reached supercritical water oxidation reaction's operating temperature, can directly let in supercritical water oxidation reactor 13, need not to add in addition the preheater.
The invention utilizes the residual coke after coal pyrolysis to carry out supercritical hydrothermal reaction, can utilize the special property of supercritical water, and can thoroughly oxidize coal in extremely short reaction time after the coal and oxygen are completely mutually dissolved in the supercritical water, and the final product is CO2、H2O、N2Etc. is free of harmful substances and SO2、NOxAnd the like, and has obvious environmental protection advantages. Meanwhile, the heat released by the supercritical water oxidation reactor 13 is utilized to preheat the entering air, so that the heat loss of the water oxidation reaction is reduced; the introduction of primary air and secondary air enables the fuel to react fully, realizes the energy gradient utilization of the whole system, and accords with the current policy of energy conservation and emission reduction.
In conclusion, the supercritical CO-based method of the invention2The heat and power cogeneration system of the circulation coupling chemical looping combustion and supercritical hydrothermal reaction has good system thermal performance and economic benefit, and has obvious energy-saving effect.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (9)
1. Based on supercritical CO2The combined heat and power generation system comprises a chemical looping combustion system, a coal water slurry system and a heat and power generation system, wherein the chemical looping combustion system is coupled with the supercritical hydrothermal reaction; the chemical looping combustion system comprises an air reactor (1), a pyrolysis furnace (2), a fuel reactor (3) and a cyclone separator (4), wherein the pyrolysis furnace (2) is connected with the air reactor (1), the fuel reactor (3) is respectively connected with the air reactor (1) and the pyrolysis furnace (2) through pipelines, and the cyclone separator (4) is respectively connected with the air reactor (1) and the fuel reactor (3) through pipelines; the coal water slurry system is respectively connected with the chemical looping combustion system and the thermoelectric generation system; the coal water slurry system comprises coal grinding equipment (6), a water storage tank (7), a water pump (8), a mixing tank (9), a colloid mill (10) and a slurry storage tank (11), wherein the water storage tank (7), the water pump (8), the mixing tank (9), the colloid mill (10), the slurry storage tank (11) and a high-pressure water coal slurry pump (12) are sequentially connected, the thermoelectric generation system is connected with the water storage tank (7), and the coal grinding equipment (6) is respectively connected with the pyrolysis furnace (2) and the mixing tank (9) through pipelines; the method is characterized in that: the system also comprises a supercritical water oxidation system, wherein the supercritical water oxidation system comprises a high-pressure water coal slurry pump (12), a supercritical water thermal reactor (13), a preheater (14) and CO2Separator (15) and N2A tank (16), the high pressure water coal slurry pump (12)The system is connected with a coal water slurry system, the preheater (14) is connected with a supercritical water thermal reactor (13), and the supercritical water thermal reactor (13) is respectively connected with a high-pressure water coal slurry pump (12) and a CO slurry pump (12) through pipelines2The separator (15) is connected with the cyclone separator (4), and the N is2The tank (16) is connected with CO through pipelines respectively2The separator (15) is connected to the thermoelectric generation system.
2. The supercritical CO-based of claim 12Coupling chemical chain burning and supercritical hydrothermal reaction's combined heat and power generation system, its characterized in that: the thermoelectric generation system comprises a heat exchanger (18), a compressor (19), a heat regenerator (20), a first-stage turbine (21), a first generator (22), a second generator (23), a second-stage turbine (24) and a waste heat boiler (25), wherein the fuel reactor (3), the heat exchanger (18), the compressor (19), the heat regenerator (20), the first-stage turbine (21), the second-stage turbine (24) and the waste heat boiler (25) are sequentially connected, the first-stage turbine (21) drives the first generator (22), the second-stage turbine (24) drives the second generator (23), and the supercritical water thermal reactor (13) is connected to a pipeline between the first-stage turbine (21) and the second-stage turbine (24) through a pipeline.
3. The supercritical CO-based of claim 12Coupling chemical chain burning and supercritical hydrothermal reaction's combined heat and power generation system, its characterized in that: the pyrolysis furnace (2) is connected with the upper portion of the air reactor (1) through a prefabricated steel plate (5), the prefabricated steel plate (5) is made of high-chromium cast iron made of graphite and M7C3 type carbide mixed base body, the thickness of the prefabricated steel plate is 3mm, the periphery of the prefabricated steel plate is sealed by high-temperature refractory bricks, heat generated in the air reactor (1) is transferred to the pyrolysis furnace (2) in a heat conduction mode, and auxiliary electric heating wires are embedded in the wall body of the periphery of the pyrolysis furnace (2).
4. The supercritical CO-based of claim 12Cogeneration system for coupling chemical looping combustion and supercritical hydrothermal reactionThe method is characterized in that: the preheater (14) is connected with the supercritical water thermal reactor (13) through a second prefabricated steel plate (17), the second prefabricated steel plate (17) is made of high-chromium cast iron made of graphite and M7C3 type carbide mixed matrix, the thickness of the second prefabricated steel plate is 2mm, and the periphery of the second prefabricated steel plate is sealed by refractory bricks, so that heat generated in the supercritical water thermal reactor (13) is transferred to the preheater (14) in a heat conduction mode.
5. Supercritical CO-based catalyst according to any one of claims 1 to 42The working method of the combined heat and power generation system for coupling chemical looping combustion and supercritical hydrothermal reaction is characterized in that: the working method comprises a chemical looping combustion step, a coal water slurry preparation step, a supercritical water oxidation reaction step and a thermoelectric generation step, wherein the chemical looping combustion step comprises the following steps:
under inert atmosphere, coal powder enters a pyrolysis furnace (2), on one hand, the coal powder receives heat conducted by a first prefabricated steel plate (5) from an air reactor (1), on the other hand, the coal powder is heated by auxiliary electric heating wires embedded around, the coal powder is fully pyrolyzed under the action of the two parts of heat, and pyrolysis products comprise gas products and residual solid residual coke;
the gas product of pyrolysis enters the fuel reactor (3) through a fuel inlet at the bottom of the fuel reactor (3) and is subjected to reduction reaction with the metal oxygen carrier to generate flue gas CO2、H2O enters the thermoelectric generation system through the output of the top gas outlet, condensed water enters the water storage tank (7), and CO enters the water storage tank2Is used to generate electricity; the reduced metal oxygen carrier enters the air reactor (1) through an oxygen carrier outlet on the side surface of the bottom, and is subjected to oxidation reaction with air entering through an air inlet on the bottom, and the oxidized oxygen carrier enters the cyclone separator (4) under the carrying of flue gas;
the oxygen carrier and the flue gas realize gas-solid separation in the cyclone separator (4), and the separated oxygen carrier enters the fuel reactor (3) through a bottom dipleg of the cyclone separator (4), so that primary circulation of the metal oxygen carrier is completed.
6. The supercritical CO-based of claim 52The working method of the combined heat and power generation system for coupling chemical looping combustion and supercritical hydrothermal reaction is characterized in that: the preparation steps of the coal water slurry are as follows:
the residual solid residual coke after pyrolysis enters coal grinding equipment (6), under the action of the coke ring roller mill, the powdery residual coke is output from the coal grinding equipment (6), enters a mixing tank (9) through a coal powder input port, and is premixed with water output from a water storage tank (7) under the action of a stirrer; the colloidal fluid formed by the residual coke and the water enters a colloid mill (10) through an output port of a mixing tank (9), is further uniformly mixed under the high-speed rotation of the rotating teeth and the fixed teeth to prepare coal water slurry, and enters a slurry storage tank (11).
7. The supercritical CO-based of claim 62The working method of the combined heat and power generation system for coupling chemical looping combustion and supercritical hydrothermal reaction is characterized in that: the supercritical water oxidation reaction comprises the following steps:
the high-pressure water coal slurry pump (12) pressurizes the coal slurry in the slurry storage tank (11) to working pressure, the coal slurry is pumped into the supercritical water thermal reactor (13), fuel and primary air from the preheater (14) and secondary air from a gas outlet at the top of the cyclone separator (4) react in sequence, wherein the primary air is formed after air is subjected to preheating by the supercritical water thermal reactor (13) in the preheater (14) through heat conduction of a second prefabricated steel plate (17); the flue gas generated by the reaction is divided into two parts and is output through a top gas outlet, wherein one part is output to CO through a first branch2A separator (15), pure CO2Enters a compressor (19) of the thermoelectric generation system, and the other part of the thermoelectric generation system is output to a secondary turbine (24) of the thermoelectric generation system through a second branch.
8. The supercritical CO-based of claim 72The working method of the combined heat and power generation system for coupling chemical looping combustion and supercritical hydrothermal reaction is characterized in that: the thermoelectric generation steps are as follows:
the flue gas is output from a gas output port at the top of the fuel reactor (3), enters a heat exchanger (18) to exchange heat with cold water from a user, water condensed from the flue gas after heat release enters a water storage tank (7), and separated CO2Is output through the flue gas outlet and comes from CO2CO of the separator (15)2Mixed and enters a compressor (19) to be compressed to 30MPa, high-pressure CO2Then enters a heat regenerator (20) to absorb heat to generate flue gas with the temperature of 700 ℃;
30MPa, 700 ℃ supercritical CO2The power enters a first-stage turbine (21) to do work and drive a first generator (22) to generate power for users to use; after work is done, part of exhaust steam is pumped back to enter the heat regenerator (20) again for circulation, the other part of exhaust steam is mixed with flue gas output by a second branch from a top gas outlet of the supercritical water thermal reactor (13) to enter a secondary turbine (24) for work, a second generator (23) is driven to generate power, and the exhaust steam enters a waste heat boiler (25) for supplying heat to users.
9. The supercritical CO-based of claim 82The working method of the combined heat and power generation system for coupling chemical looping combustion and supercritical hydrothermal reaction is characterized in that: the temperature after the heat of the air reactor (1) heats the pyrolysis furnace (2) is 850-.
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