CN114151773B - Photovoltaic-oxygen-enriched combustion coupling power generation system and method - Google Patents

Photovoltaic-oxygen-enriched combustion coupling power generation system and method Download PDF

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Publication number
CN114151773B
CN114151773B CN202111452662.9A CN202111452662A CN114151773B CN 114151773 B CN114151773 B CN 114151773B CN 202111452662 A CN202111452662 A CN 202111452662A CN 114151773 B CN114151773 B CN 114151773B
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power generation
photovoltaic
photovoltaic module
oxygen
heat exchanger
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CN114151773A (en
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张锦萍
刘银河
陈磊
王长安
车得福
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Xian Jiaotong University
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Xian Jiaotong University
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00Methods of steam generation characterised by form of heating method
    • F22B1/22Methods of steam generation characterised by form of heating method using combustion under pressure substantially exceeding atmospheric pressure
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25BELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00Electrolytic production of inorganic compounds or non-metals
    • C25B1/01Products
    • C25B1/02Hydrogen or oxygen
    • C25B1/04Hydrogen or oxygen by electrolysis of water
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10Adaptations for driving, or combinations with, electric generators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K17/00Using steam or condensate extracted or exhausted from steam engine plant
    • F01K17/02Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
    • F01K17/025Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic in combination with at least one gas turbine, e.g. a combustion gas turbine
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22DPREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/50Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22DPREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D11/00Feed-water supply not provided for in other main groups
    • F22D11/02Arrangements of feed-water pumps
    • F22D11/06Arrangements of feed-water pumps for returning condensate to boiler
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22GSUPERHEATING OF STEAM
    • F22G7/00Steam superheaters characterised by location, arrangement, or disposition
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C5/00Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
    • F23C5/08Disposition of burners
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23KFEEDING FUEL TO COMBUSTION APPARATUS
    • F23K1/00Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23KFEEDING FUEL TO COMBUSTION APPARATUS
    • F23K1/00Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
    • F23K1/04Heating fuel prior to delivery to combustion apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23KFEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/02Pneumatic feeding arrangements, i.e. by air blast
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D15/00Other domestic- or space-heating systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/001Drying-air generating units, e.g. movable, independent of drying enclosure
    • F26B21/002Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02SGENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S10/00PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
    • H02S10/10PV power plants; Combinations of PV energy systems with other systems for the generation of electric power including a supplementary source of electric power, e.g. hybrid diesel-PV energy systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23KFEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2201/00Pretreatment of solid fuel
    • F23K2201/20Drying
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23KFEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2201/00Pretreatment of solid fuel
    • F23K2201/50Blending
    • F23K2201/501Blending with other fuels or combustible waste
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30Hydrogen technology
    • Y02E60/36Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • Y02P20/129Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • Y02P20/133Renewable energy sources, e.g. sunlight

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  • General Engineering & Computer Science (AREA)
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  • Combustion & Propulsion (AREA)
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Abstract

The invention discloses a photovoltaic-oxygen-enriched combustion coupling power generation system and a method, wherein the system comprises a photovoltaic power generation unit, a photovoltaic module backboard waste heat utilization unit and an oxygen-enriched combustion power generation unit; according to the method, the semicoke and the lignite are subjected to layered mixed combustion power generation in the boiler by using an oxygen-enriched combustion technology, the photovoltaic power generation with low cost is used for supplying power to the air separator so as to reduce energy consumption, the lignite is dried by using the waste heat of the back plate of the photovoltaic power generation assembly, an external heat source is saved, the photoelectric conversion efficiency is improved, a heater is additionally arranged in front of a tail flue dust collector, and the investment of a temperature reduction device is saved while the waste heat of flue gas is used. The invention fully utilizes widely distributed solar energy resources and cheap coal pyrolysis byproduct semi-coke, and has the advantages of high thermal efficiency, low pollutant discharge, low energy consumption and good economy compared with the traditional coal-fired power plant.

Description

Photovoltaic-oxygen-enriched combustion coupling power generation system and method
Technical Field
The invention belongs to the field of efficient clean combustion and new energy utilization of coal, and particularly relates to a photovoltaic-oxygen-enriched combustion coupling power generation system and method, which are suitable for solving the problems of high energy consumption of an oxygen-enriched combustion system and waste heat of solar power generation.
Background
Although the total amount of coal resources in China is rich, the proportion of high-quality coal is not high, and low-rank coal accounts for more than 55% of the total reserve of coal. The pyrolysis of the low-rank coal is an important mode for clean and efficient utilization of the low-rank coal, but the utilization rate of a pyrolysis byproduct semi-coke powder material is low, and the semi-coke powder material with high heat value and low price is combusted to generate power, so that the problem of reduction of economic benefits of a power plant caused by increase of coal price can be effectively solved. However, the content of volatile components in the semicoke is very low, the burning process has the defects of difficult ignition, low burnout rate and NO x And the emission is high.
The oxygen-enriched combustion technology adopts pure oxygen and circulating flue gas to replace air for combustion supporting, and can directly obtain high-concentration CO 2 The method can reduce the loss of smoke discharge, improve the thermal efficiency of the boiler, has the efficiency of high-efficiency desulfurization and denitration, and is a high-efficiency low-pollution combustion power generation mode. Compared with the traditional power plant, the oxygen-enriched combustion power plant is mainly additionally provided with an oxygen generation system and a flue gas circulation system, wherein the investment and the operation cost of the oxygen generation system account for most of the newly-increased cost (more power generation power is consumed).
Therefore, the method for generating power by utilizing the semicoke to perform clean combustion on the oxygen-enriched combustion system with lower energy consumption in a large scale has wide practical significance, and plays a great role in promoting the development of the coal utilization technology and economic benefit in China.
Disclosure of Invention
The invention aims to provide a photovoltaic-oxygen-enriched combustion coupling power generation system and method. In particular to a method for generating power by mixing and burning semicoke with low volatile matter and lignite with high volatile matter in a boiler in a layered way under the condition of oxygen-enriched combustion. The method comprises the steps of supplying power to an air separator by utilizing photovoltaic power generation to reduce energy consumption, constructing a heat pump system, drying lignite by utilizing the waste heat of a back plate of a photovoltaic power generation assembly, reducing the temperature of the back plate of the photovoltaic assembly to improve the photovoltaic power generation efficiency, saving an external heat source for drying the lignite, spraying the lignite into the bottom layer and the top layer of a boiler burner, spraying semicoke into the middle layer of the boiler burner to form a combustion organization mode of a hearth of combustible fuel wrapped by difficult-to-burn fuel, additionally arranging a heater in front of a tail flue dust remover, saving a temperature reduction device while utilizing the waste heat of flue gas, electrolyzing water separated from the flue gas after purification treatment, using oxygen as a combustion improver, using hydrogen as an industrial raw material, and providing the energy consumption in the water electrolysis process by the photovoltaic power generation. The invention improves the photoelectric conversion efficiency, reduces the energy consumption and reduces the pollutant emission of the power station while utilizing the coal resources and the solar energy.
The invention is realized by adopting the following technical scheme:
a photovoltaic-oxygen-enriched combustion coupling power generation method comprises the following steps:
carrying out layered co-combustion on the semicoke with low volatile content and the lignite with high volatile content in a boiler under the condition of oxygen-enriched combustion to generate electricity; the air separator is powered by photovoltaic power generation, lignite is dried by utilizing the waste heat of a back plate of a photovoltaic power generation assembly, the lignite is sprayed into the bottom layer and the top layer of a boiler burner, semicoke is sprayed into the middle layer of the boiler burner, a heater is additionally arranged in front of a tail flue dust collector, water separated from flue gas is purified and then electrolyzed, oxygen is used as a combustion improver, hydrogen is used as an industrial raw material, and energy consumption in the water electrolysis process is provided by the photovoltaic power generation.
A photovoltaic-oxygen-enriched combustion coupling power generation system comprises a photovoltaic power generation unit, a photovoltaic module backboard waste heat utilization unit and an oxygen-enriched combustion power generation unit;
the photovoltaic power generation unit comprises a photovoltaic module and a grid-connected inverter;
the photovoltaic module backboard waste heat utilization unit comprises a photovoltaic module backboard heat exchanger, a compressor, a dedusting smoke heat exchanger, an expansion valve, a first induced draft fan and a second induced draft fan;
the oxygen-enriched combustion power generation unit comprises an air separator, a steel ball coal mill, a boiler burner, a convection superheater and a screen superheater;
the system comprises a photovoltaic module, a grid-connected inverter, a power supply device of an air separator, a backboard of the photovoltaic module, a backboard heat exchanger of the photovoltaic module, a compressor, a dedusting smoke heat exchanger and an expansion valve, wherein the photovoltaic module is connected with the grid-connected inverter through a power transmission network required by the air separator, the backboard of the photovoltaic module is connected with the backboard heat exchanger of the photovoltaic module, the backboard heat exchanger of the photovoltaic module is sequentially connected with the compressor, the dedusting smoke heat exchanger and the expansion valve to form a heat pump system, a hot air outlet of the dedusting smoke heat exchanger is connected with an inlet of a lignite storage device, an outlet of a steel ball coal mill is connected with a middle layer burner of a boiler burner, a convection superheater and a screen superheater are arranged on the top layer of a hearth, the tail part of a boiler is sequentially connected with a denitration device, a heater, a dust remover, a desulfurization device, a condenser and CO pipeline 2 The conversion device, the entry of first draught fan links to each other with the export of dust remover, the export of first draught fan links to each other with the air intake of dust removal gas heater, the entry of second draught fan links to each other with the exhanst gas outlet of condenser, the export of second draught fan links to each other with the air intake of photovoltaic module backplate heat exchanger, the water outlet of condenser links to each other with water purification installation's entry, water purification installation's export links to each other with electrolytic water installation's entry, an export of electrolytic water installation links to each other with the air supply spout of boiler burner, another export links to each other with hydrogen storage device.
The invention is further improved in that the outlet of the brown coal storage device is connected with the inlet of a fan coal mill, the outlet of the fan coal mill is connected with the bottom layer burner and the top layer burner of the boiler burner, and the outlet of the semi-coke bin is connected with the inlet of the steel ball coal mill.
The invention is further improved in that the outlet of the platen superheater is connected with the steam inlet of the steam turbine, the rotor of the steam turbine is connected with the rotor of the generator through a flange, and the extracted steam of the steam turbine is connected with the economizer of the boiler through a pipeline.
The invention has the further improvement that the photovoltaic module is used for supplying power to the air separator, thereby reducing the consumption of coal power generation and reducing the overall energy consumption.
The further improvement of the invention is that when the semicoke and the lignite are co-burned under the condition of oxygen-enriched combustion, the dried lignite is sprayed from the bottom layer and the top layer of the boiler burner, the semicoke is sprayed from the middle layer of the boiler burner, and a layered combustion mode that combustible fuel wraps the nonflammable fuel is formed in the hearth.
The invention has the further improvement that a photovoltaic module backboard heat exchanger is arranged on a backboard of the photovoltaic module, part of low-temperature flue gas after the condenser is sent into the photovoltaic module backboard heat exchanger through a second induced draft fan, part of high-temperature flue gas after the dust remover is sent into the dust removal flue gas heat exchanger through a first induced draft fan, and the energy consumption of a compressor is provided by photovoltaic power generation through a power transmission network required by a photovoltaic module waste heat utilization unit; therefore, the photovoltaic module backboard heat exchanger, the compressor, the dedusting smoke heat exchanger and the expansion valve form a heat pump system, and the obtained high CO 2 The concentrated hot air is introduced into the lignite storage device and used for drying the lignite.
The invention has the further improvement that after the flue gas is condensed in the condenser, the liquid water is purified in the water purification device and then is electrolyzed in the water electrolysis device to generate hydrogen and oxygen, wherein the obtained hydrogen is used in the chemical industry, the oxygen enters the boiler burner as a supplementary combustion improver, and the electric energy required by the electrolyzed water is provided by the photovoltaic power generation unit.
The further improvement of the invention is that when the air-conditioning system works, after the photovoltaic component is processed by the grid-connected inverter, the generated electricity is supplied to the air separator through the power transmission network, the oxygen obtained by separation is sent to the air supply nozzle of the boiler burner through the air pipe, the obtained nitrogen is used for various industries of industry according to the purity of the nitrogen, and the photovoltaic component is used for supplying power to the air separator;
arranging a photovoltaic module backboard heat exchanger on a backboard of the photovoltaic module, sending part of low-temperature smoke gas behind a condenser into the photovoltaic module backboard heat exchanger through a second induced draft fan, sending part of higher-temperature smoke gas behind a dust remover into a dust removal smoke gas heat exchanger through a first induced draft fan, forming a heat pump system by the photovoltaic module backboard heat exchanger, a compressor, the dust removal smoke gas heat exchanger and an expansion valve, and obtaining high CO 2 Concentration hot air is let in brown coal storage deviceThe device is used for drying lignite which is ground by a fan coal mill and then sprayed into the bottom layer and the top layer of a boiler burner, semicoke in a semicoke bin is ground by a steel ball mill and then sprayed into the middle layer of the boiler burner, and a layered combustion mode that combustible fuel wraps flame-retardant fuel is formed in a hearth;
after high-temperature flue gas in a boiler hearth passes through a convection superheater and a screen superheater, the superheater absorbs heat and transfers the heat to a steam turbine, a generator is driven to generate electricity through energy conversion, and steam extracted by the steam turbine in the process is deoxidized and then returns to an economizer as return water;
a heater is additionally arranged in front of a dust remover of a tail flue of the boiler to supply heat for residents in a plant area and nearby residents, and a cooling system before dust removal is omitted while waste heat of flue gas is utilized;
the flue gas is condensed and separated from gas in a condenser after dust removal and desulfurization treatment in a dust remover and a desulfurization device, liquid water is electrolyzed in an electrolytic water device after purification treatment in a water purification device to generate hydrogen and oxygen, wherein the obtained hydrogen is used in chemical industry, the oxygen enters a boiler burner as a supplementary combustion improver, the electric energy required by the electrolytic water is provided by a photovoltaic power generation unit, and the dry flue gas is subjected to CO (carbon monoxide) power generation 2 The conversion device carries out reasonable conversion and utilization or sealing treatment;
the electricity generated by the photovoltaic power generation unit is used for supplying power to the air separator, the water electrolysis device and the compressor through the power transmission network required by the air separator, the power transmission network required by the water electrolysis device and the power transmission network required by the photovoltaic module waste heat utilization unit, and the residual electricity is stored through the power transmission networks required by the rest electricity utilization to be matched with a peak shaving task of coal-fired power generation or sold.
The invention has at least the following beneficial technical effects:
according to the photovoltaic-oxygen-enriched combustion coupling power generation system and method, when the oxygen-enriched combustion generator set is used for absorbing the semi-coke of the pyrolysis byproduct, the photovoltaic power generation unit is constructed in a matched mode, and the photovoltaic power generation unit is used for compensating the station service power consumed by the oxygen-enriched combustion system due to air separation, so that the total power supply amount can be increased, and the problem of high operation cost of the oxygen-enriched combustion power generation system can be solved. Meanwhile, the lignite is dried by using the waste heat of the back plate of the photovoltaic power generation assembly, the photovoltaic power generation efficiency is improved, and a large amount of external heat sources are saved.
The heater is additionally arranged in front of the tail flue dust remover, and the temperature reduction device is saved while the waste heat of the flue gas is utilized. The water separated from the flue gas is electrolyzed after being purified, the energy consumption in the water electrolysis process is provided by photovoltaic power generation, the separated high-grade hydrogen is used as an industrial raw material, and the oxygen is used as the supply of a combustion improver of an oxygen-enriched combustion system.
In conclusion, the invention fully utilizes the solar energy resource given by nature, consumes the byproduct semi-coke in the coal conversion process, reduces the energy consumption, reduces the pollutant emission of the power station and realizes the purposes of low-carbon economy and cyclic emission reduction.
Drawings
Fig. 1 is a schematic diagram of the structure of the present invention.
Description of reference numerals:
1 is a photovoltaic component, 2 is a grid-connected inverter, 3 is an air separator, 4 is a power transmission network required by the air separator, 5 is a power transmission network required by a water electrolysis device, 6 is a power transmission network required by a photovoltaic component waste heat utilization unit, 7 is a power transmission network required by the rest electricity, 8 is a photovoltaic component back plate heat exchanger, 9 is a compressor, 10 is a dedusting smoke heat exchanger, 11 is an expansion valve, 12 is a brown coal storage device, 13 is a fan coal mill, 14 is a semi-coke bin, 15 is a steel ball coal mill, 16 is a boiler burner, 17 is a convection superheater, 18 is a screen superheater, 19 is a steam turbine, 20 is a generator, 21 is an economizer, 22 is a denitration device, 23 is a heater, 24 is a dust remover, 25 is a first induced draft fan, 26 is a desulfurization device, 27 is a condenser, 28 is CO 2 The conversion device 29 is a water purification device, the water electrolysis device 30 is a water electrolysis device, and the second induced draft fan 31 is a second induced draft fan.
a is air, b is nitrogen, and c is oxygen.
Detailed Description
The invention is further described in detail in the following with reference to the accompanying drawings
As shown in fig. 1, the photovoltaic-oxycombustion coupled power generation system provided by the invention comprises a photovoltaic power generation unit, a photovoltaic module backboard waste heat utilization unit and an oxycombustion power generation unit.
The photovoltaic power generation unit comprises a photovoltaic component 1, a grid-connected inverter 2, a power transmission network 4 required by an air separator, a power transmission network 5 required by a water electrolysis device, a power transmission network 6 required by a photovoltaic component waste heat utilization unit and a power transmission network 7 required by the rest of electricity.
The photovoltaic module waste heat utilization unit comprises a photovoltaic module backboard heat exchanger 8, a compressor 9, a dust removal flue gas heat exchanger 10, an expansion valve 11, a lignite storage device 12, a lignite conveying device, a first induced draft fan 25 and a second induced draft fan 31.
The oxygen-enriched combustion power generation unit comprises an air separator 3, a brown coal storage device 12, a brown coal conveying device, a fan coal mill 13, a semi-coke bin 14, a steel ball coal mill 15, a boiler burner 16, a convection superheater 17, a screen superheater 18, a steam turbine 19, a power generator 20, an economizer 21, a denitration device 22, a heater 23, a dust remover 24, a desulfurization device 26, a condenser 27, CO 2 A conversion device 28, a water purification device 29 and an electrolytic water device 30.
The photovoltaic module 1 is connected with a grid-connected inverter 2, and the grid-connected inverter 2 is connected with a power supply device of an air separator 3 through a power transmission network 4 required by the air separator; the back plate of the photovoltaic module 1 is connected with a photovoltaic module back plate heat exchanger 8, the photovoltaic module back plate heat exchanger 8 is sequentially connected with a compressor 9, a dedusting smoke heat exchanger 10 and an expansion valve 11 to form a heat pump system, the hot air outlet of the dedusting smoke heat exchanger 10 is connected with the inlet of a lignite storage device 12, the outlet of the lignite storage device 12 is connected with the inlet of a fan coal mill 13, the outlet of the fan coal mill 13 is connected with the bottom layer combustor and the top layer combustor of the boiler combustor 16, the outlet of the semicoke bin 14 is connected with the inlet of a steel ball coal mill 15, the outlet of the steel ball coal mill 15 is connected with the middle layer burner of a boiler burner 16, the convection superheater 17 and the platen superheater 18 are arranged on the top layer of the hearth, the outlet of the platen superheater 18 is connected with the steam inlet of a steam turbine 19, and the rotor of the steam turbine 19 is connected with the rotor of a generator 20 through a method.The device is connected with the boiler, the extracted steam of the steam turbine 19 is connected with an economizer 21 of the boiler through a pipeline, and a denitration device 22, a heater 23, a dust remover 24, a desulphurization device 26, a condenser 27 and CO are sequentially arranged at the tail part of the boiler 2 Conversion equipment 28 all links to each other through flue gas pipeline, the export of entry and dust remover 24 of first draught fan 25 link to each other, the export of first draught fan 25 links to each other with the air intake of dust removal gas heat exchanger 10, the entry of second draught fan 31 link to each other with the exhanst gas outlet of condenser 27, the export of second draught fan 31 links to each other with photovoltaic module backplate heat exchanger 8's air intake, condenser 27's water outlet and water purification unit 29's entry link to each other, water purification unit 29's export with the entry of electrolysis water installation 30 link to each other, an export of electrolysis water installation 30 links to each other with boiler burner 16's air supply spout, another export links to each other with hydrogen storage device.
Furthermore, the photovoltaic module 1 is used for supplying power to the air separator 3, so that the consumption of coal-fired power generation can be reduced, and the overall energy consumption is reduced.
Furthermore, the heat of the back plate of the photovoltaic module 1 is utilized to dry the lignite, so that the energy provided by an external heat source can be saved.
Further, when the semicoke and the lignite are co-combusted under the oxygen-enriched combustion condition, the dry lignite is sprayed from the bottom layer and the top layer of the boiler combustor 16, the semicoke is sprayed from the middle layer of the boiler combustor 16, a layered combustion mode that combustible fuel wraps the nonflammable fuel is formed in the hearth, the lignite of the bottom layer combustor has the functions of igniting and supporting combustion for the semicoke, and the lignite of the top layer combustor has the function of promoting burnout for the semicoke.
Furthermore, a heater 23 is additionally arranged in front of a dust remover of the tail flue of the boiler, and a cooling system before dust removal is omitted while the waste heat of the flue gas is utilized.
Further, a photovoltaic module backboard heat exchanger 8 is arranged on a backboard of the photovoltaic module 1, part of low-temperature flue gas behind the condenser 27 is sent into the photovoltaic module backboard heat exchanger 8 through a second induced draft fan 31, part of high-temperature flue gas behind the dust remover 24 is sent into the dust removal flue gas heat exchanger 10 through a first induced draft fan 25, and the compressor 9 consumes energy and is needed by photovoltaic power generation through a photovoltaic module waste heat utilization unitIs provided by the transmission grid 6. Therefore, the photovoltaic module backboard heat exchanger 8, the compressor 9, the dedusting flue gas heat exchanger 10 and the expansion valve 11 form a heat pump system, and the obtained high CO 2 The concentration hot air is introduced into the lignite storage device 12 and used for drying lignite, the temperature of a backboard of the photovoltaic module can be reduced, the photovoltaic power generation efficiency is improved, energy provided by an external heat source required by lignite drying can be saved, and spontaneous combustion of lignite can be avoided.
Further, after the flue gas is condensed in the condenser 27, the liquid water is purified in the water purification device 29 and electrolyzed in the water electrolysis device 30 to generate hydrogen and oxygen, wherein the obtained hydrogen is used in the chemical industry, and the oxygen enters the boiler burner as a supplementary combustion improver. The electric energy required for the electrolysis of water is provided by a photovoltaic power generation unit. The clean liquid water can be used as boiler backwater by adopting a traditional method.
The invention provides a photovoltaic-oxygen-enriched combustion coupling power generation method, which comprises the following steps:
1) after the photovoltaic module 1 is processed by the grid-connected inverter 2, the generated electricity is supplied to the air separator 3 through the power transmission network, the air separator adopts a pressure swing adsorption type separation device with simple structure and lower cost, the separated oxygen is sent to an air supply nozzle of the boiler burner 16 through an air pipe, the prepared nitrogen is used for various industries of the industry according to the purity of the nitrogen, the photovoltaic module 1 is used for supplying power to the air separator 3, the consumption of coal electricity can be reduced, and the overall energy consumption is reduced;
2) arranging a photovoltaic module backboard heat exchanger 8 on a backboard of the photovoltaic module 1, sending part of low-temperature flue gas after a condenser 27 into the photovoltaic module backboard heat exchanger 8 through a second induced draft fan 31, sending part of higher-temperature flue gas after a dust remover 24 into a dust removal flue gas heat exchanger 10 through a first induced draft fan 25, forming a heat pump system by the photovoltaic module backboard heat exchanger 8, a compressor 9, the dust removal flue gas heat exchanger 10 and an expansion valve 11, and obtaining high CO 2 The concentrated hot air is introduced into a brown coal storage device 12 and is used for drying brown coal, the dried brown coal is sprayed from the bottom layer and the top layer of a boiler burner 16 after being ground by a fan coal mill 13, and the semicoke in a semicoke bin 14 is sprayed from the middle layer of the boiler burner 16 after being ground by a steel ball coal mill 15 and is sprayed into a hearthForming a layered combustion mode that combustible fuel wraps the flame-retardant fuel;
3) after high-temperature flue gas in a boiler hearth passes through the convection superheater 17 and the screen superheater 18, the superheater absorbs heat and transfers the heat to the steam turbine 19, the steam turbine drives the generator 20 to generate power through energy conversion, and in the process, extracted steam of the steam turbine is subjected to deoxidization and the like and then returns to the economizer as return water
4) The heater 23 is additionally arranged in front of the dust remover of the tail flue of the boiler, so that the heat can be supplied to residents in a factory and nearby residents, and a cooling system before dust removal is omitted while the waste heat of the flue gas is utilized.
5) The flue gas is condensed in a condenser 27 and separated from the gas after dust removal and desulfurization treatment in a dust remover 24 and a desulfurization device 26, liquid water is electrolyzed in an electrolysis water device 30 after purification treatment in a water purification device 29 to generate hydrogen and oxygen, wherein the obtained hydrogen is used in the chemical industry, and the oxygen enters a boiler burner 16 as a supplementary combustion improver. The electric energy required for the electrolysis of water is provided by a photovoltaic power generation unit. The clean liquid water can be used as boiler backwater by adopting a traditional method. Passing dry flue gas through CO 2 The conversion device 28 performs reasonable conversion utilization or sealing treatment.
Besides the electricity generated by the photovoltaic power generation unit is used for supplying electricity to the air separator 3, the water electrolysis device 30 and the compressor 9 through the power transmission network 4 required by the air separator, the power transmission network 5 required by the water electrolysis device and the power transmission network 6 required by the photovoltaic module waste heat utilization unit, the residual electricity can be stored through the power transmission network 7 required by the residual electricity to be matched with the peak shaving task of coal-fired power generation or be sold.
In summary, the oxygen-enriched combustion power generation system and the photovoltaic power generation unit are coupled to efficiently and cleanly utilize the semicoke of the coal pyrolysis byproduct, the service power increased by the oxygen-enriched combustion system due to air separation is compensated by photovoltaic power generation, the total power supply amount can be improved, the operation cost of the oxygen-enriched combustion power generation system can be reduced, and meanwhile, the lignite is dried by using the waste heat of the back plate of the photovoltaic power generation assembly, so that the photovoltaic power generation efficiency is improved while a large amount of external heat sources are saved; the semicoke with low volatile matter and the lignite with high volatile matter form a layered mixed combustion mode of combustible fuel wrapping nonflammable fuel in a boiler furnace, so that the ignition and burnout characteristics of the semicoke can be improved; the heater is additionally arranged in front of the tail flue dust remover, so that a temperature reducing device is saved while the waste heat of the flue gas is utilized, and the waste of heat is avoided. The system fully utilizes the solar energy resources and the byproduct semicoke in the coal conversion process, reduces energy consumption, reduces the emission of pollutants in a power station, solves the problems of resource waste, land occupation, dust pollution and the like caused by semicoke accumulation, and has great significance for promoting the strategic goals of low-carbon economy and cyclic emission reduction.
It should be understood that this example is only for illustrating the present invention and is not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, however, these equivalents also fall within the scope of the present invention as defined by the appended claims.

Claims (8)

1. A photovoltaic-oxygen-enriched combustion coupling power generation system is characterized by comprising a photovoltaic power generation unit, a photovoltaic module backboard waste heat utilization unit and an oxygen-enriched combustion power generation unit;
the photovoltaic power generation unit comprises a photovoltaic module (1) and a grid-connected inverter (2);
the photovoltaic module backboard waste heat utilization unit comprises a photovoltaic module backboard heat exchanger (8), a compressor (9), a dedusting smoke heat exchanger (10), an expansion valve (11), a first induced draft fan (25) and a second induced draft fan (31);
the oxygen-enriched combustion power generation unit comprises an air separator (3), a steel ball coal mill (15), a boiler burner (16), a convection superheater (17) and a screen superheater (18);
the photovoltaic module (1) is connected with the grid-connected inverter (2), the grid-connected inverter (2) is connected with power supply equipment of the air separator (3) through a power transmission network (4) required by the air separator, a back plate of the photovoltaic module (1) is connected with a photovoltaic module back plate heat exchanger (8), the photovoltaic module back plate heat exchanger (8) is sequentially connected with a compressor (9), a dedusting smoke heat exchanger (10) and an expansion valve (11) to form a heat pump system, and a hot air outlet of the dedusting smoke heat exchanger (10) is connected with a brown coal storage device (12)The inlet of the steel ball coal mill (15) is connected with the middle layer combustor of the boiler combustor (16), the convection superheater (17) and the screen superheater (18) are arranged on the top layer of the hearth, and the tail part of the boiler is connected with a denitration device (22), a heater (23), a dust remover (24), a desulfurization device (26), a condenser (27) and CO sequentially through a flue gas pipeline 2 Conversion equipment (28), the entry of first draught fan (25) links to each other with the export of dust remover (24), the export of first draught fan (25) links to each other with the air intake of dust removal gas heater (10), the entry of second draught fan (31) links to each other with the exhanst gas outlet of condenser (27), the export of second draught fan (31) links to each other with the air intake of photovoltaic module backplate heat exchanger (8), the water outlet of condenser (27) links to each other with water purification installation (29) the entry, water purification installation (29) the export links to each other with the entry of brineelectrolysis device (30), an export of brineelectrolysis device (30) links to each other with the air supply spout of boiler combustor (16), another export links to each other with hydrogen storage device.
2. A photovoltaic-oxycombustion coupled power generation system according to claim 1, characterized in that the outlet of the brown coal storage device (12) is connected to the inlet of a fan pulverizer (13), the outlet of the fan pulverizer (13) is connected to the bottom burner and the top burner of the boiler burner (16), and the outlet of the semi-coke bin (14) is connected to the inlet of a steel ball pulverizer (15).
3. A photovoltaic-oxycombustion coupled power generation system according to claim 2, characterized in that the platen superheater (18) has an outlet connected to a steam inlet of a steam turbine (19), the rotor of the steam turbine (19) is flanged to the rotor of the generator (20), and the extracted steam of the steam turbine (19) is connected to the boiler economizer (21) through a pipeline.
4. The photovoltaic-oxygen-rich combustion coupled power generation system as claimed in claim 2, wherein the photovoltaic module (1) is used for supplying power to the air separator (3), so that the consumption of power generation on coal is reduced, and the overall energy consumption is reduced.
5. A photovoltaic-oxycombustion coupled power generation system according to claim 2, wherein when the semicoke and the lignite are co-fired under the oxycombustion condition, the dried lignite is injected from the bottom layer and the top layer of the boiler burner (16), and the semicoke is injected from the middle layer of the boiler burner (16), so that a layered combustion mode of combustible fuel wrapping the nonflammable fuel is formed in the furnace.
6. A photovoltaic-oxygen-enriched combustion coupled power generation system according to claim 2, characterized in that a photovoltaic module backboard heat exchanger (8) is arranged on a backboard of the photovoltaic module (1), part of low-temperature flue gas after the condenser (27) is sent to the photovoltaic module backboard heat exchanger (8) through a second induced draft fan (31), part of higher-temperature flue gas after the dust remover (24) is sent to the dust removal flue gas heat exchanger (10) through a first induced draft fan (25), and the energy consumption of the compressor (9) is provided by the photovoltaic power generation through a power transmission network (6) required by a photovoltaic module waste heat utilization unit; therefore, the photovoltaic module backboard heat exchanger (8), the compressor (9), the dedusting flue gas heat exchanger (10) and the expansion valve (11) form a heat pump system, and the obtained high CO 2 The concentrated hot air is introduced into a lignite storage device (12) and is used for drying lignite.
7. A photovoltaic-oxycombustion coupled power generation system according to claim 2, characterized in that after the flue gas is condensed in the condenser (27), the liquid water is purified in the water purification device (29) and electrolyzed in the water electrolysis device (30) to generate hydrogen and oxygen, wherein the obtained hydrogen is used in chemical industry, the oxygen is fed into the boiler burner as supplementary combustion improver, and the electric energy required by the electrolyzed water is provided by the photovoltaic power generation unit.
8. The photovoltaic-oxygen-enriched combustion coupled power generation system of claim 2, wherein in operation, after the photovoltaic module (1) is processed by the grid-connected inverter (2), the generated electricity is supplied to the air separator (3) through the power transmission network, the separated oxygen is sent to the air supply nozzle of the boiler burner (16) through the air pipe, the prepared nitrogen is used for various industries of industry according to the purity of the nitrogen, and the photovoltaic module (1) is used for supplying power to the air separator (3);
arranging a photovoltaic module backboard heat exchanger (8) on a backboard of a photovoltaic module (1), sending part of low-temperature flue gas behind a condenser (27) into the photovoltaic module backboard heat exchanger (8) through a second induced draft fan (31), sending part of higher-temperature flue gas behind a dust remover (24) into a dust removal flue gas heat exchanger (10) through a first induced draft fan (25), forming a heat pump system by the photovoltaic module backboard heat exchanger (8), a compressor (9), the dust removal flue gas heat exchanger (10) and an expansion valve (11), and obtaining high CO 2 The concentrated hot air is introduced into a lignite storage device (12) and is used for drying lignite, the dried lignite is sprayed from the bottom layer and the top layer of a boiler burner (16) after being ground by a fan coal mill (13), semicoke in a semicoke bin (14) is sprayed from the middle layer of the boiler burner (16) after being ground by a steel ball coal mill (15), and a layered combustion mode that combustible fuel wraps flame-resistant fuel is formed in a hearth;
after high-temperature flue gas in a boiler hearth passes through a convection superheater (17) and a platen superheater (18), the superheater absorbs heat and transfers the heat to a steam turbine (19), a generator (20) is driven to generate power through energy conversion, and steam extracted by the steam turbine in the process is deoxidized and then returns to an economizer as return water;
a heater (23) is additionally arranged in front of a dust remover of a tail flue of the boiler to supply heat for residents in a plant area and nearby residents, and a cooling system before dust removal is omitted while waste heat of flue gas is utilized;
the flue gas is condensed and separated from gas in a condenser (27) after being dedusted and desulfurized in a deduster (24) and a desulfurizer (26), liquid water is electrolyzed in an electrolytic water device (30) after being purified in a water purifier (29) to generate hydrogen and oxygen, wherein the obtained hydrogen is used in chemical industry, the oxygen enters a boiler burner (16) to be used as a supplementary combustion improver, electric energy required by the electrolyzed water is provided by a photovoltaic power generation unit, and dry flue gas is subjected to CO (carbon monoxide) gas 2 The conversion device (28) carries out reasonable conversion and utilization or sealing treatment;
the electricity generated by the photovoltaic power generation unit is used for supplying power to the air separator (3), the water electrolysis device (30) and the compressor (9) through the power transmission network (4) required by the air separator, the power transmission network (5) required by the water electrolysis device and the power transmission network (6) required by the photovoltaic module waste heat utilization unit, and the residual electricity is stored through the power transmission networks (7) required by the rest electricity to be matched with a peak regulation task of coal-fired power generation or sold.
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CN108507188A (en) * 2018-03-13 2018-09-07 上海理工大学 A kind of co-generation unit and its working method integrating oxygen-enriched combusting and burning chemistry chains based on solar energy
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