CN113074362A - Coal burner unit coupled biomass power generation system with carbon capture and method - Google Patents

Coal burner unit coupled biomass power generation system with carbon capture and method Download PDF

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Publication number
CN113074362A
CN113074362A CN202110434915.3A CN202110434915A CN113074362A CN 113074362 A CN113074362 A CN 113074362A CN 202110434915 A CN202110434915 A CN 202110434915A CN 113074362 A CN113074362 A CN 113074362A
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China
Prior art keywords
boiler
coal
flue gas
combustion boiler
biomass
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CN202110434915.3A
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Chinese (zh)
Inventor
彭志福
邓中乙
马启磊
潘存华
韩磊
方军庭
洪皓月
李冬
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Datang Boiler Pressure Vessel Examination Center Co Ltd
East China Electric Power Test Institute of China Datang Corp Science and Technology Research Institute Co Ltd
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Datang Boiler Pressure Vessel Examination Center Co Ltd
East China Electric Power Test Institute of China Datang Corp Science and Technology Research Institute Co Ltd
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Priority to CN202110434915.3A priority Critical patent/CN113074362A/en
Publication of CN113074362A publication Critical patent/CN113074362A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, 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
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, 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
    • F22D11/00—Feed-water supply not provided for in other main groups
    • F22D11/02—Arrangements of feed-water pumps
    • F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/006—Layout of treatment plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F23J15/025—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N3/00—Regulating air supply or draught
    • F23N3/005—Regulating air supply or draught using electrical or electromechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
    • F23N5/006—Systems for controlling combustion using detectors sensitive to combustion gas properties the detector being sensitive to oxygen

Abstract

The invention discloses a biomass power generation system coupled with a coal-fired unit with carbon capture, which comprises a coal-fired unit boiler, a biomass combustion boiler, a chimney, a carbon dioxide storage tank, an oxygen storage tank and a flue gas circulating fan, wherein a water supply system of the coal-fired unit boiler is connected with the biomass combustion boiler, and water heated by the biomass combustion boiler enters the water supply system and a water-cooled wall of the coal-fired unit boiler through a pipeline; the biomass combustion boiler is characterized in that a flue gas outlet pipeline of the biomass combustion boiler is respectively connected with a chimney and a carbon dioxide storage tank, a pipeline between the chimney and the carbon dioxide storage tank is connected with a flue gas circulating fan, an outlet of the flue gas circulating fan is connected with an air inlet end of the biomass combustion boiler, and an oxygen storage tank is connected with an air inlet end of the biomass combustion boiler. The invention also discloses a method for adopting the power generation system, and the beneficial effects of the invention are as follows: the device realizes the capture and storage of carbon dioxide in the flue gas, thereby realizing the capture and utilization of carbon and realizing zero carbon emission in combustion.

Description

Coal burner unit coupled biomass power generation system with carbon capture and method
Technical Field
The invention relates to the field of biomass power generation by coupling a coal burner set, in particular to a biomass power generation system with carbon capture by coupling the coal burner set.
Background
Under the current situation, the traditional coal-electricity units face huge challenges, and a clean low-carbon energy system is constructed to make the coal-electricity technology imperative. Besides further improving the efficiency, the coal and electricity energy resource recycling method also needs to actively promote source carbon emission reduction technology and research and develop reserve tail end carbon emission reduction technology. The main development route at present is to actively develop the coupling power generation technology of the coal-fired unit, including biomass coupling, garbage sludge coupling and the like; secondly, carbon capture, sealing and utilization are vigorously developed, and carbon emission is reduced.
At present, biomass power generation is power generation by using biomass energy of biomass, and is one of renewable energy power generation, including power generation by direct combustion of agricultural and forestry waste, power generation by gasification of agricultural and forestry waste, power generation by incineration of garbage, power generation by landfill gas, and power generation by biogas. However, because the unit capacity is small and the parameters are low, the power generation efficiency of the technology is generally not higher than 25%.
The main element of biomass is C, H, O, and contains small amounts of N and S. If air is used for supporting combustion, the main components after combustion are N2, CO2 and H2O, and if the recycled flue gas is used for injecting pure oxygen for supporting combustion, the main components after combustion are CO2And H2O，H2O can be removed by drying, so that the flue gas component is mainly CO2Can realize CO2Thereby realizing high concentration of CO2The capture and utilization of the water.
The oxygen-enriched combustion technology is one of the technologies with potential carbon capture by fire and electricity, a lot of active exploration is carried out worldwide at present, and the carbon capture demonstration base of oxygen-enriched combustion with the grade of 35MW is already provided in China. However, if the existing large coal-fired power generation unit needs to be modified into an oxygen-enriched combustion technical unit, the modification system is too much, the modification cost is too high, the existing large pure oxygen preparation equipment or process technology is not mature, and the oxygen-enriched combustion modification on the large coal-fired unit is not practical at present.
In order to reduce carbon emission of a coal-fired unit, a plurality of coal-fired units plan coupling biomass power generation transformation of the coal-fired unit at present, the coupling mode is fuel side coupling and steam side coupling, if the fuel side coupling is adopted, a biomass combustion boiler needs to be newly built, the oxygen consumption of the biomass combustion boiler of the coal-fired unit is equivalent to small, and the carbon capture can be realized by adopting a eutrophication combustion technology through adopting the steam side coupling technology.
As in application No.: 201720087268.2, 1. A clean energy utilization system with multiple coupling of a coal-fired unit and a biomass gasification technology comprises a boiler and a turbo generator unit, and is characterized by also comprising a biomass gasification furnace, a biomass pre-dryer, a storage bin, an ash residue waste heat utilization device and gasification medium conveying equipment, wherein the storage bin is communicated with the biomass pre-dryer, the biomass pre-dryer is connected with the biomass gasification furnace and the boiler, and the biomass gasification furnace is simultaneously connected with a high-temperature gas burner of the boiler, the ash residue waste heat utilization device and the gasification medium conveying equipment.
The device has realized the coupling of coal-fired unit and living beings to a certain extent, but does not carry out carbon capture, can't realize reducing carbon and discharge.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to solve the problem that no carbon is trapped in a coupling system of a coal-fired unit and biomass in the prior art.
The invention solves the technical problems through the following technical means:
the biomass power generation system comprises a coal-fired unit boiler, a biomass combustion boiler, a chimney, a carbon dioxide storage tank, an oxygen storage tank and a flue gas circulating fan, wherein a water supply system of the coal-fired unit boiler is connected with the biomass combustion boiler, and water heated by the biomass combustion boiler enters the water supply system and a water-cooled wall of the coal-fired unit boiler through pipelines;
chimney, carbon dioxide holding vessel are connected gradually on biomass combustion boiler's the exhanst gas outlet pipeline, and the pipe connection that is located between chimney, the carbon dioxide holding vessel flue gas circulating fan, flue gas circulating fan's exit linkage biomass combustion boiler's inlet end, the oxygen storage tank is connected biomass combustion boiler's inlet end.
The coupling mode of the biomass and the coal-fired unit of the system adopts steam-water side coupling, the system comprises two independent boilers, the biomass is combusted in a special biomass combustion boiler, the generated heat is used for heating condensed water and boiler water of the coal-fired unit, and the heated condensed water and boiler water are returned to a steam-water system of the coal-fired unit; the biomass combustion boiler adopts an oxygen-enriched combustion technology to realize the enrichment of carbon dioxide in flue gas, and the system is provided with carbon dioxide capture and storage equipment, so that the carbon capture and utilization are realized, and the carbon emission is reduced.
Preferably, the water supply system of the coal-fired unit boiler comprises a water supply pipeline, and a condensate pump, a low-pressure heater, a deaerator, a coal-fired unit water supply pump and a high-pressure heater which are sequentially connected to the water supply pipeline; the water outlets of the condensate pumps are respectively connected with the low-pressure heaters and the biomass combustion boiler through a first pipeline, and the biomass combustion boiler is connected with the deaerator through a second pipeline; the water outlet of the deaerator is connected with a water feed pump of the coal-fired unit, the outlet of the water feed pump is respectively connected with a high-pressure heater and is connected with the biomass combustion boiler through a third pipeline, and the biomass combustion boiler is connected with the water-cooled wall of the coal-fired unit boiler through a fourth pipeline.
The steam and water of the biomass combustion boiler are divided into a low-pressure system and a high-pressure system, so that the comprehensive utilization of energy of the biomass combustion boiler is realized, the heat loss of the biomass combustion boiler is reduced, and the heat efficiency of the biomass combustion boiler is improved.
Preferably, the system further comprises a first flow rate regulating valve and a second flow rate regulating valve for regulating flow rate, wherein the first flow rate regulating valve is connected to the first pipeline, and the second flow rate regulating valve is connected to the third pipeline.
Preferably, the flue gas treatment device is connected to the flue gas outlet pipeline and located in front of the inlet of the chimney.
Preferably, the system further comprises a filter device for filtering gas entering the carbon dioxide storage tank, wherein the filter device is connected to the flue gas outlet pipeline.
Preferably, the flue gas outlet pipeline is connected with a carbon dioxide concentration measuring device.
Preferably, the biomass combustion boiler further comprises an oxygen concentration measuring device, and the oxygen concentration measuring device is connected to an air inlet pipeline of the biomass combustion boiler.
Preferably, the flue gas recirculation system further comprises an air inlet pipeline, and the air inlet pipeline is connected with the inlet pipeline of the flue gas recirculation fan.
The system of the invention can adopt an air combustion technology and an oxygen-enriched combustion technology, adopts air as a combustion improver for starting at the initial starting stage, can isolate an oxygen supply system when pure oxygen is insufficient or pure oxygen supply equipment has defects in a plant, can adopt an air combustion mode for the biomass combustion boiler, adopts a starting stage for a smoke and air system flow, can normally operate the biomass combustion boiler at the moment, and reduces the forced shutdown probability of the biomass combustion boiler.
Preferably, the air outlet end of the oxygen storage tank is provided with a third flow regulating valve for regulating the flow of oxygen.
The invention also provides a method for coupling the coal burner group with the carbon capture to a biomass power generation system, which comprises the following steps:
in the biomass combustion boiler, air is used as a combustion improver to start at the initial starting stage, a flue gas circulating fan is started, and the air enters a hearth of the biomass combustion boiler after being pressurized by the flue gas circulating fan and is finally discharged through a chimney;
after the boiler is ignited successfully and burns stably, the oxygen storage tank is synchronously opened, the air inlet is closed, the oxygen content in the mixture of the flue gas and the oxygen is adjusted to a set value, the biomass combustion boiler enters an oxygen-enriched combustion stage, when the concentration of carbon dioxide in the flue gas is higher than the set value, the carbon dioxide storage tank is opened, the chimney is closed, and all carbon dioxide generated by the biomass combustion boiler is collected and stored;
after the biomass combustion boiler is started, a water supply system of the coal-fired unit boiler is communicated with the biomass combustion boiler, and water heated by the biomass combustion boiler enters the water supply system and the water-cooled wall of the coal-fired unit boiler through a pipeline.
Preferably, the water supply system of the coal-fired unit boiler comprises a water supply pipeline, and a condensate pump, a low-pressure heater, a deaerator and a coal-fired unit water supply pump which are sequentially connected to the water supply pipeline; the water outlets of the condensate pumps are respectively connected with the low-pressure heaters and the biomass combustion boiler through a first pipeline, and the biomass combustion boiler is connected with the deaerator through a second pipeline; the water outlets of the deaerators are respectively connected with a water feeding pump of the coal-fired unit and connected with the biomass combustion boiler through a third pipeline, and the biomass combustion boiler is connected with a water cooled wall of the coal-fired unit boiler through a fourth pipeline;
the first flow regulating valve is connected to the first pipeline, and the second flow regulating valve is connected to the third pipeline;
obtaining a difference K which is T-Ta by measuring the water temperature T of the first pipeline and respectively combining the water temperature T with a set value Ta, judging K, if K is greater than 5, opening the first flow regulating valve by 1% of opening degree, if K < -5, closing the first flow regulating valve by 1% of opening degree, and if K is less than or equal to-5, keeping the opening degree unchanged; the temperature in the third conduit is regulated in the same manner as the first conduit.
Preferably, the outlet end of the oxygen storage tank is provided with a third flow regulating valve for regulating the flow of oxygen, and the specific method for regulating the oxygen content in the mixture of the flue gas and the oxygen to the set value comprises the following steps: by measuring the oxygen content O2 in the mixture of the flue gas and the oxygen to a set value O2a, obtaining the difference X ═ O2-O2a, judging X, if X is not enough>0.5, the opening degree of the third flow rate regulating valve is increased by 1%, and if X is reached<And (4) closing the 1% opening degree of the third flow rate regulating valve when the flow rate is-0.5 and X is less than or equal to 0.5, and keeping the flow rate unchanged.
The invention has the advantages that:
(1) the coupling mode of the biomass and the coal-fired unit of the system adopts steam-water side coupling, the system comprises two independent boilers, the biomass is combusted in a special biomass combustion boiler, the generated heat is used for heating condensed water and boiler water of the coal-fired unit, and the heated condensed water and boiler water are returned to a steam-water system of the coal-fired unit; the biomass combustion boiler adopts an oxygen-enriched combustion technology to realize the enrichment of Carbon dioxide in flue gas, and the system is provided with Carbon dioxide Capture and Storage equipment, so that Carbon Capture and Utilization are realized, zero Carbon emission in combustion is realized, and CCUS (Carbon Capture, Utilization and Storage, CCUS for short) is realized;
(2) the steam water of the biomass combustion boiler is divided into a low-pressure system and a high-pressure system, so that the comprehensive utilization of energy of the biomass combustion boiler is realized, the heat loss of the biomass combustion boiler is reduced, and the heat efficiency of the biomass combustion boiler is improved;
(3) the biomass combustion boiler and the coal-fired unit can be designed to share the same chimney, so that the cost is saved;
(4) the system can adopt an air combustion technology and an oxygen-enriched combustion technology, and adopts air as a combustion improver to start at the initial starting stage so as to realize the air combustion technology; when the pure oxygen in the plant is insufficient or the pure oxygen supply equipment has defects, the oxygen supply system can be isolated, the biomass combustion boiler can adopt an air combustion mode, the flow of the smoke and air system adopts a starting stage, and the biomass combustion boiler can normally operate at the moment, so that the forced shutdown probability of the biomass combustion boiler is reduced;
(5) the deviation of the outlet temperature T and the set value Ta is ensured within a reasonable range, and the safety of steam-water side coupling is ensured.
Drawings
FIG. 1 is a schematic structural diagram of a biomass power generation system coupled to a coal burner train with carbon capture in an embodiment of the invention;
FIG. 2 is a schematic view of temperature regulation in an embodiment of the present invention;
FIG. 3 is a schematic diagram of oxygen regulation in an embodiment of the present invention;
reference numbers in the figures:
100. a coal-fired unit system; 101. a coal-fired unit boiler; 102. a coal economizer; 103. a high pressure heater; 104. a condensate pump; 105. a low pressure heater; 106. a deaerator; 107. a water supply pump of the coal-fired unit;
200. a biomass combustion system; 201. a biomass combustion boiler; 202. a flue gas treatment device; 203. a chimney; 204. a filtration device; 205. a carbon dioxide storage tank; 206. a flue gas circulating fan; 207. an oxygen storage tank; 208. a carbon dioxide concentration measuring device; 209. an oxygen concentration measuring device; 210. an air inlet duct; 211. a third flow rate damper; 212. a first flapper door; 213. a second shutter door; 214. a third shutter door; 215. a fourth flapper door; 216. a recirculation flapper door; 217. the oxygen inlet is shut off the valve;
300. a conduit assembly; 301. a first conduit; 302. a second conduit; 303. a third pipeline; 304. a fourth conduit; 305. a first flow rate regulator; 306. a second flow regulator;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1, a coal burner train coupled biomass power generation system with carbon capture includes a coal burner train system 100, a biomass combustion system 200, a conduit assembly 300 for connecting the two;
the coal-fired unit system 100 comprises a coal-fired unit boiler 101, an economizer 102 and a high-pressure heater 103, wherein a water supply system of the coal-fired unit boiler 101 comprises a water supply pipeline, and a condensate pump 104, a low-pressure heater 105, a deaerator 106 and a coal-fired unit water supply pump 107 which are sequentially connected to the water supply pipeline;
the pipe assembly 300 includes a first pipe 301, a second pipe 302, a third pipe 303, a fourth pipe 304;
the steam water of the biomass combustion boiler 201 is divided into a low-pressure system and a high-pressure system, wherein the low-pressure system is equivalent to a bypass of a low-pressure heater system of the coal burner group system 100; after the pressure of the desalted water is increased by the condensate pump 104, one part of the desalted water is heated by the low-pressure heater 105 and then is deoxidized in the deaerator 106, the other part of the desalted water enters the low-pressure system of the biomass combustion boiler 201, and the desalted water enters the deaerator 106 through the second pipeline 302 and is deoxidized after being heated by the flue gas in the biomass combustion boiler 201; after being pressurized by a water feeding pump 107 of the coal-fired unit, one part of the pressurized pumped fed into the economizer 102 through the high-pressure heater 103, and the other part of the pressurized pumped fed into the high-pressure system of the biomass combustion boiler 201, and then fed into a water-cooled wall outlet header of the coal-fired unit boiler 101 (the pressurized water-cooled wall outlet header enters a water-cooled wall intermediate header due to the low temperature in the starting stage) after being.
The pipe assembly 300 further includes a first flow rate regulating valve 305 for regulating a low-pressure system, and a second flow rate regulating valve 306 for regulating a high-pressure system, wherein the first flow rate regulating valve 305 is connected to the first pipe 301, and the second flow rate regulating valve 306 is connected to the third pipe 303.
In addition, electric doors (or valves for controlling opening and closing and the like) are arranged on the first pipeline 301, the second pipeline 302, the third pipeline 303 and the fourth pipeline 304; temperature measuring devices for measuring temperature are further arranged on the second pipeline 302 and the fourth pipeline 304.
The biomass combustion system 200 comprises a biomass combustion boiler 201, a flue gas treatment device 202, a chimney 203, a filtering device 204, a carbon dioxide storage tank 205, a flue gas circulating fan 206 and an oxygen storage tank 207;
flue gas processing apparatus 202, chimney 203, filter equipment 204, carbon dioxide holding vessel 205 are connected gradually on biomass combustion boiler 201's the flue gas outlet pipeline, and the pipe connection that is located between chimney 203, the filter equipment 204 flue gas circulating fan 206, flue gas circulating fan 206's exit linkage biomass combustion boiler 201's inlet end, oxygen storage tank 207 connects biomass combustion boiler 201's inlet end. The inlet end of the biomass fired boiler 201 also includes a fuel inlet.
The chimney 203 in the embodiment can be used as a common chimney for the coal-fired unit boiler 101 and the biomass combustion boiler 201, so that the expenditure is saved.
Example two:
as shown in fig. 1, on the basis of the first embodiment, the outlet end of the oxygen storage tank 207 is provided with a third flow rate regulating valve 211 for regulating the flow rate of oxygen. The pure oxygen used by the system can adopt pure oxygen as a byproduct of hydrogen production by water electrolysis or oxygen in air separated by an air separation device, and the oxygen is stored in the oxygen storage tank 207.
The biomass combustion system 200 further comprises a carbon dioxide concentration measuring device 208, wherein the carbon dioxide concentration measuring device 208 is connected to the flue gas outlet pipeline and is positioned between the flue gas treatment device 202 and the chimney 203; the biomass combustion boiler system further comprises an oxygen concentration measuring device 209, wherein the oxygen concentration measuring device 209 is connected to an air inlet pipeline of the biomass combustion boiler 201 and is used for measuring the oxygen content in the mixed gas of the oxygen and the flue gas at the inlet.
The biomass combustion system 200 further comprises an air inlet pipeline 210, the air inlet pipeline 210 is connected to the flue gas outlet pipeline and is located at the inlet side of the flue gas circulating fan 206, and air entering from the air inlet pipeline 210 is used for mixing with flue gas and then enters the flue gas circulating fan 206.
The biomass combustion system 200 further comprises a first baffle door 212, a second baffle door 213, a third baffle door 214, a fourth baffle door 215, a recycling baffle door 216 and an oxygen inlet shutoff valve 217, wherein the first baffle door 212 and the second baffle door 213 are positioned at two ends of the flue gas circulating fan 206, the third baffle door 214 is used for controlling the opening and closing of a chimney, and the fourth baffle door 215 is used for controlling the opening and closing of the air inlet pipeline 210; a recirculation damper door 216 is located between the air inlet duct 210 and the chimney 203; the oxygen inlet shutoff valve 217 is disposed on the outlet pipe of the oxygen storage tank 207 and is used for opening and closing the oxygen storage tank 207.
The coupling mode of biomass and a coal-fired unit in the biomass power generation system with carbon capture of the embodiment adopts steam-water side coupling, the system comprises two independent boilers (a coal-fired unit boiler 101 and a biomass combustion boiler 201), biomass is combusted in the special biomass combustion boiler 201, the generated heat is used for heating condensed water and boiler water of the coal-fired unit system 100, and the heated condensed water and boiler water are returned to the steam-water system of the coal-fired unit; wherein the biomass combustion boiler 201 adopts the oxygen-enriched combustion technology to realize the enrichment of carbon dioxide in the flue gas, and the system is provided with carbon dioxide capture and storage equipment, thereby realizing the capture and utilization of carbon and reducing the carbon emission.
Biomass combustion boiler 201 can adopt air combustion technique and oxygen boosting combustion technique, adopts the air to start as the combustion improver at the initial stage of starting to can be in the factory when the pure oxygen is not enough or supplies the pure oxygen equipment to appear the defect, can completely cut off oxygen system, biomass combustion boiler 201 can adopt the air combustion mode, flue gas system flow adopts the start-up stage, but biomass combustion boiler 201 normal operating this moment has reduced biomass combustion boiler 201 and has forced the probability of blowing out.
Example three:
as shown in fig. 1, 2 and 3, the present embodiment further provides a method for coupling a biomass power generation system with the coal burner group with carbon capture in the second embodiment, which includes the following steps:
(1) in the starting stage of the biomass combustion boiler 201, because the rich-nutrient combustion stage is not yet started, air is adopted as a combustion improver to start at the initial starting stage, and the first baffle door 212, the second baffle door 213, the third baffle door 214 and the fourth baffle door 215 are opened; in the initial starting stage, air is used as a combustion improver to start, the flue gas circulating fan 206 is started, and the air enters the hearth of the biomass combustion boiler 201 after being pressurized by the flue gas circulating fan 206 and is finally discharged through the chimney 203;
(2) after the boiler is ignited successfully and burns stably, the flue gas recirculation damper 216 is opened, the oxygen inlet shutoff valve 217 is synchronously opened, the fourth damper 215 is closed after the flue gas recirculation damper 216 and the oxygen inlet shutoff valve 217 are fully opened, at the moment, the third flow regulating valve 211 is opened in an automatic regulating mode, the oxygen content O2 of the flue gas and oxygen mixture is regulated to a set value O2a, and the oxygen content regulating logic is shown in figure 3; at the moment, the biomass combustion boiler 201 enters an oxygen-enriched combustion stage, combustion-supporting gas is a mixture of flue gas and pure oxygen, as the proportion of nitrogen in the flue gas is higher, the residual flue gas is continuously discharged from the chimney 203, the nitrogen content in the flue gas 203 is lower and the carbon dioxide content is higher along with the increase of the circulation times of the flue gas, when the concentration of carbon dioxide in the flue gas is higher than a set value, a baffle door in front of the filtering device 204 is opened, after the baffle door is fully opened, the flue gas is closed to the baffle door of the chimney 203, and at the moment, all carbon dioxide generated by the biomass combustion boiler 201 enters the carbon dioxide storage tank 205 to capture and store the carbon dioxide;
(3) after the biomass combustion boiler 201 is started, after the pressure of the demineralized water is increased by the condensate pump 104, one part of the demineralized water is heated by the low-pressure heater 105 and then is deoxidized in the deaerator 106, and the other part of the demineralized water enters the low-pressure system of the biomass combustion boiler 201, is heated by the flue gas in the biomass combustion boiler 201 and then enters the deaerator 106 through the second pipeline 302 to be deoxidized; after being pressurized by a water feeding pump 107 of the coal-fired unit, one part of the pressurized pumped fed into the economizer 102 through the high-pressure heater 103, and the other part of the pressurized pumped fed into the high-pressure system of the biomass combustion boiler 201, and then fed into a water-cooled wall outlet header of the coal-fired unit boiler 101 (the pressurized water-cooled wall outlet header enters a water-cooled wall intermediate header due to the low temperature in the starting stage) after being.
As shown in fig. 2, a specific method of adjusting the temperature of the water supply system is:
the first flow regulating valve 305 and the second flow regulating valve 306 regulate the heat load condition of the biomass combustion boiler 201 according to the conditions of the coal-fired unit and the biomass combustion boiler 201, the regulating quantities are the outlet temperature of a high-pressure system and the outlet temperature of a low-pressure system of the biomass boiler respectively, the deviation of the outlet temperature T and a set value Ta is ensured within a reasonable range, and the coupling safety of a steam-water side is guaranteed.
The difference K is T-Ta by measuring the water temperature T in the first pipeline 301 and respectively obtaining the difference value with the set value Ta, and K is determined, if K is greater than 5, the opening degree of the first flow rate regulating valve 305 is increased by 1%, if K < -5, the opening degree of the first flow rate regulating valve 305 is decreased by 1%, and if-5 is less than or equal to K less than or equal to 5, the difference value is kept unchanged.
The temperature in the third pipeline 303 is adjusted in the same manner as the first pipeline 301;
as shown in fig. 3, the specific method for adjusting the oxygen flow rate of the oxygen storage tank 207 includes:
the outlet end of the oxygen storage tank 207 is provided with a third flow regulating valve 211 for regulating the flow of oxygen, and the specific method for regulating the oxygen content in the mixture of the flue gas and the oxygen to a set value comprises the following steps: and obtaining a difference value X between O2 and O2a by measuring the oxygen amount O2 in the mixture of the flue gas and the oxygen to a set value O2a, judging X, if X is greater than 0.5, opening the third flow regulating valve 211 by 1 percent, if X is less than-0.5, closing the third flow regulating valve 211 by 1 percent, and if X is less than-0.5 and less than 0.5, keeping the difference value unchanged.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (12)

1. The biomass power generation system is characterized by comprising a coal-fired unit boiler, a biomass combustion boiler, a chimney, a carbon dioxide storage tank, an oxygen storage tank and a flue gas circulating fan, wherein a water supply system of the coal-fired unit boiler is connected with the biomass combustion boiler, and water heated by the biomass combustion boiler enters the water supply system and a water-cooled wall of the coal-fired unit boiler through a pipeline;
the biomass combustion boiler is characterized in that a chimney and a carbon dioxide storage tank are respectively connected to a flue gas outlet pipeline of the biomass combustion boiler, a pipeline between the chimney and the carbon dioxide storage tank is connected with the flue gas circulating fan, an outlet of the flue gas circulating fan is connected with an air inlet end of the biomass combustion boiler, and an oxygen storage tank is connected with the air inlet end of the biomass combustion boiler.
2. The carbon capture-capable coal fired unit-coupled biomass power generation system of claim 1, wherein the water feed system of the coal fired unit boiler comprises a water feed pipe and a condensate pump, a low pressure heater, a deaerator, a coal fired unit water feed pump, a high pressure heater sequentially connected to the water feed pipe; the water outlets of the condensate pumps are respectively connected with the low-pressure heaters and the biomass combustion boiler through a first pipeline, and the biomass combustion boiler is connected with the deaerator through a second pipeline; the water outlet of the deaerator is connected with a water feed pump of the coal-fired unit, the outlet of the water feed pump is respectively connected with a high-pressure heater and is connected with the biomass combustion boiler through a third pipeline, and the biomass combustion boiler is connected with the water-cooled wall of the coal-fired unit boiler through a fourth pipeline.
3. The carbon capture-capable coal burner train-coupled biomass power generation system of claim 2, further comprising a first flow gate connected to the first conduit and a second flow gate connected to the third conduit for regulating flow.
4. The carbon capture-capable coal burner train-coupled biomass power generation system of claim 1, further comprising a flue gas treatment device for treating flue gas entering a stack, the flue gas treatment device being connected to the flue gas outlet duct and located before the stack inlet.
5. The carbon capture-capable coal burner train-coupled biomass power generation system of claim 1, further comprising a filtration device for filtering gas entering the carbon dioxide storage tank, the filtration device connected to the flue gas outlet duct.
6. The carbon capture-capable coal burner train-coupled biomass power generation system of claim 1, further comprising a carbon dioxide concentration measurement device connected to the flue gas outlet duct.
7. The carbon capture-enabled coal burner train-coupled biomass power generation system of claim 1, further comprising an oxygen concentration measurement device connected to an air intake duct of the biomass combustion boiler.
8. The carbon capture-capable coal burner train-coupled biomass power generation system of claim 1, further comprising an air inlet duct connected to the flue gas recirculation fan inlet duct.
9. The carbon capture-capable coal burner train-coupled biomass power generation system of claim 1, wherein the outlet end of the oxygen storage tank is provided with a third flow damper for regulating oxygen flow.
10. A method of coupling a biomass power generation system with a coal burner train as claimed in any one of claims 1 to 9, comprising the steps of:
in the biomass combustion boiler, air is used as a combustion improver to start at the initial starting stage, a flue gas circulating fan is started, and the air enters a hearth of the biomass combustion boiler after being pressurized by the flue gas circulating fan and is finally discharged through a chimney;
after the boiler is ignited successfully and burns stably, the oxygen storage tank is synchronously opened, the air inlet is closed, the oxygen content in the mixture of the flue gas and the oxygen is adjusted to a set value, the biomass combustion boiler enters an oxygen-enriched combustion stage, when the concentration of carbon dioxide in the flue gas is higher than the set value, the carbon dioxide storage tank is opened, the chimney is closed, and all carbon dioxide generated by the biomass combustion boiler is collected and stored;
after the biomass combustion boiler is started, a water supply system of the coal-fired unit boiler is communicated with the biomass combustion boiler, and water heated by the biomass combustion boiler enters the water supply system and the water-cooled wall of the coal-fired unit boiler through a pipeline.
11. The carbon capture-capable coal burner group-coupled biomass power generation method of claim 1, wherein the water supply system of the coal burner group boiler comprises a water supply pipeline, and a condensate pump, a low pressure heater, a deaerator and a coal burner group water supply pump which are sequentially connected to the water supply pipeline; the water outlets of the condensate pumps are respectively connected with the low-pressure heaters and the biomass combustion boiler through a first pipeline, and the biomass combustion boiler is connected with the deaerator through a second pipeline; the water outlets of the deaerators are respectively connected with a water feeding pump of the coal-fired unit and connected with the biomass combustion boiler through a third pipeline, and the biomass combustion boiler is connected with a water cooled wall of the coal-fired unit boiler through a fourth pipeline;
the first flow regulating valve is connected to the first pipeline, and the second flow regulating valve is connected to the third pipeline;
obtaining a difference K which is T-Ta by measuring the water temperature T of the first pipeline and respectively combining the water temperature T with a set value Ta, judging K, if K is greater than 5, opening the first flow regulating valve by 1% of opening degree, if K < -5, closing the first flow regulating valve by 1% of opening degree, and if K is less than or equal to-5, keeping the opening degree unchanged; the temperature in the third conduit is regulated in the same manner as the first conduit.
12. The biomass power generation method coupled with the coal burner group with carbon capture as claimed in claim 1, wherein the outlet end of the oxygen storage tank is provided with a third flow rate adjusting valve for adjusting the flow rate of oxygen, and the specific method for adjusting the oxygen amount in the mixture of flue gas and oxygen to the set value is as follows: by measuring the oxygen content O in the mixture of flue gas and oxygen2To the set value O2a, obtaining the difference X ═ O2-O2a, judging X, if X is not enough>0.5, the opening degree of the third flow rate regulating valve is increased by 1%, and if X is reached<And (4) closing the 1% opening degree of the third flow rate regulating valve when the flow rate is-0.5 and X is less than or equal to 0.5, and keeping the flow rate unchanged.
CN202110434915.3A 2021-04-22 2021-04-22 Coal burner unit coupled biomass power generation system with carbon capture and method Pending CN113074362A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114320490A (en) * 2021-11-18 2022-04-12 中国大唐集团新能源科学技术研究院有限公司 Green energy chemical system based on hydrogen production from renewable energy

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114320490A (en) * 2021-11-18 2022-04-12 中国大唐集团新能源科学技术研究院有限公司 Green energy chemical system based on hydrogen production from renewable energy

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