CN108678822A - A kind of Novel supercritical CO suitable for coal-fired power generation field2Combined cycle system - Google Patents
A kind of Novel supercritical CO suitable for coal-fired power generation field2Combined cycle system Download PDFInfo
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- CN108678822A CN108678822A CN201810384183.XA CN201810384183A CN108678822A CN 108678822 A CN108678822 A CN 108678822A CN 201810384183 A CN201810384183 A CN 201810384183A CN 108678822 A CN108678822 A CN 108678822A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K21/00—Steam engine plants not otherwise provided for
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- 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
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- General Engineering & Computer Science (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
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Abstract
The invention discloses a kind of Novel supercritical CO suitable for coal-fired power generation field for belonging to efficiency power generation apparatus field2Combined cycle system.The combined cycle system is made of the top circulatory system, bottom cycle system, air preheater endothermic system, and three systems absorb the heat that coal combustion generates in boiler jointly.Wherein top cycle is double reheat recompression cycle, bottoming cycle is that progressive solution is recycled and is made of bottoming cycle cooler, the first compressor of bottoming cycle, bottoming cycle cryogenic regenerator, the second compressor of bottoming cycle by-pass valve, the second compressor of bottoming cycle, bottoming cycle high temperature regenerator, the first back-end ductwork heater by-pass valve, the first back-end ductwork heater, the first turbine of bottoming cycle, the second back-end ductwork heater, the second turbine of bottoming cycle, which can make combined cycle system efficiency higher in top cycle turbine inlet temperature within the scope of 580 640 DEG C.And ensure air preheater safe operation.
Description
Technical field
The invention belongs to efficiency power generation apparatus fields, and in particular to a kind of Novel supercritical suitable for coal-fired power generation field
CO2Combined cycle system.
Technical background
Supercritical carbon dioxide Brayton cycle (S-CO2Cycle) in recent years in sodium-cooled fast reactor power generation, tower type solar light
The fields such as hot power generation, gas turbine flue gas UTILIZATION OF VESIDUAL HEAT IN have carried out relatively broad research.In vapor Rankine cycle correlation skill
It is because compared to vapor Rankine cycle S-CO that this research is carried out under conditions of art is more mature2Cycle is capable of providing
The advantage to have a great attraction.
Such as under identical turbine inlet temperature, S-CO2Cycle is compared to vapor Rankine cycle in middle isothermal region
(550 DEG C -700 DEG C) can have higher efficiency.In addition CO2Chemical property torpescence is a kind of very stable substance of property, therefore
Make it possible to CO2Corrosion with tube wall weakens.So compared to vapor Rankine cycle, under identical material condition, S-CO2
The turbine inlet temperature of cycle may further increase, and then promote cycle efficieny.So S-CO2In terms of circulating in improved efficiency
There are higher potentiality.
Coal fired power generation provides stable, sufficient supply of electric power for the world at present, and coal fired power generation accounts for whole world power generation total amount
39.3%, it is counted according to British Petroleum Company, the use of coal is 153 years also sustainable, is far above oil and natural gas.Although money
Source, environment, climate change pressure make coal fired power generation Challenge, but coal fired power generation accounted in all kinds of generation technologies it is leading
The present situation of status still will not change in short-term, mid-term.So the coal-fired power generator set explored and promote high-efficiency cleaning still has
It is significant.By S-CO2Cycle applications are in the new exploration that coal-fired power generation field is to coal-fired power generator set.
But by S-CO2Cycle applications can face tail flue gas waste heat problem when coal-fired power generation field, this problem
Generate, the S-CO of identical turbine suction parameter related to cycle arrangement2Recompression cycle and traditional vapor Rankine cycle phase
Than recompression cycle CO2Temperature of the working medium at boiler inlet is higher, due to the CO at flue gas and boiler inlet2Working medium needs to protect
Certain temperature difference is demonstrate,proved, so CO2Temperature of the working medium at boiler inlet is higher, and the flue-gas temperature meaned at this is equally higher, therefore
The back-end ductwork fume afterheat of boiler is more, for Rankine cycle, when unit is double reheat extra-supercritical unit, economizer
Enter the temperature (temperature of the water at boiler inlet) of saliva substantially at 340 DEG C or so, but for Brayton cycle, this temperature meeting
Higher.Compared with Rankine cycle, under identical temperature and pressure Parameter Conditions, recompression cycle CO2Temperature at this is~410 DEG C,
When cycle uses double reheat to arrange, this temperature is~510 DEG C.Therefore S-CO2Unit boiler back-end ductwork exists a large amount of remaining
Heat.Increase if waste heat cannot effectively absorb the heat that boiler can be made to be discharged into environment so that boiler efficiency reduces, to drop
The gross efficiency of low-heat Force system.Here it is S-CO2The waste heat problem that coal fired power generation is faced.
The problem can be solved by building combined-circulation, but the effect for being different combined-circulation solution is different, if
Combined-circulation structure is unreasonable, can reduce system generating efficiency, and the reduction of system generating efficiency can understand in terms of two,
If 1, fume afterheat cannot fully absorb, electricity generation system boiler efficiency can reduce, 2, fume afterheat be absorbed, still
Cycle efficieny is relatively low, and the thermal efficiency of cycle of such electricity generation system can reduce.
According to S-CO2This feature of coal fired power generation, we have proposed one kind to be suitable for S-CO2One kind of coal fired power generation is multiple
Cycle is closed, the bottoming cycle of wherein combined-circulation is put forward for the first time for this patent, which can be in the same of efficient absorption fume afterheat
When so that thermal efficiency of cycle is higher, therefore this is circulated in an extensive warm area can realize reasonable, efficient power generation.
Invention content
The problem of according to being previously mentioned in background technology, the present invention provides a kind of suitable for the novel super of coal-fired power generation field
Critical CO2Combined cycle system, which is characterized in that including：Push up the circulatory system, bottom cycle system and air preheater heat absorption system
System, wherein each heater in the circulatory system of top is arranged in the leading portion of burner hearth and horizontal flue, back-end ductwork, bottom cycle system
Heater be arranged in boiler back end ductwork stage casing, flue gas first flow through top the circulatory system after flow through bottom cycle system, flow through bottom
The flue gas of the circulatory system enters the air preheater endothermic system in back-end ductwork back segment, and the heat that coal combustion generates is first by pushing up
The circulatory system absorbs, and the heat that the top circulatory system cannot fully absorb is absorbed by bottom cycle system, through bottom cycle system discharge
The waste heat that flue gas is included is absorbed in air preheater endothermic system by air.
The top circulatory system includes：Push up recirculation cooler, top the first compressor of cycle, top cycle cryogenic regenerator, top
The second compressor by-pass valve, top the second compressor of cycle, top cyclic high-temperature regenerator, top combined-circulation once-through boiler first is recycled to heat
Device, top the first turbine of cycle, top combined-circulation once-through boiler secondary heater, top the second turbine of cycle, top combined-circulation once-through boiler third heater and
Top cycle third turbine；Wherein, top combined-circulation once-through boiler primary heater, top combined-circulation once-through boiler secondary heater and top combined-circulation once-through boiler third
Heater is arranged in the leading portion of boiler furnace, horizontal flue and back-end ductwork, push up combined-circulation once-through boiler primary heater outlet with
The inlet/outlet of top the first turbine of cycle, top combined-circulation once-through boiler secondary heater inlet/outlet, top the second turbine inlet/outlet of cycle, top cycle
Boiler third heater inlet/outlet, top cycle third turbine inlet port, push up cyclic high-temperature regenerator low-pressure side inlet/outlet with
Top cycle cryogenic regenerator low pressure side inlet is sequentially connected；Top cycle cryogenic regenerator low-pressure side working medium pipeline outlet respectively with
Top recirculation cooler is connected with top the second compressor by-pass valve of cycle, wherein the outlet of top recirculation cooler, top cycle first
Compressor inlet/outlet with top cycle the on high-tension side entry sequence of cryogenic regenerator be connected, top cycle the second compressor by-pass valve and
The entrance of top the second compressor of cycle is connected, and the top on high-tension side outlet of cycle cryogenic regenerator goes out with top the second compressor of cycle
Mouth is connected after converging with the top on high-tension side entrance of cyclic high-temperature regenerator, and cyclic high-temperature regenerator on high-tension side outlet in top is followed with top
The entrance of ring boiler primary heater is connected.
The flow flowed through in the second compressor by-pass valve accounts for the 33.21-31.64% of total flow.
Combined-circulation once-through boiler primary heater, top combined-circulation once-through boiler secondary heater and top combined-circulation once-through boiler are pushed up in the top circulatory system
The inlet temperature of third heater is identical；
Combined-circulation once-through boiler primary heater, top combined-circulation once-through boiler secondary heater and top combined-circulation once-through boiler are pushed up in the top circulatory system
The outlet temperature of third heater is all between 580-640 degree；Second back-end ductwork heater outlet in the bottom cycle system
Temperature range is between 486-578 DEG C.
The bottom cycle system includes：Bottoming cycle cooler, the first compressor of bottoming cycle, bottoming cycle cryogenic regenerator, bottom
Recycle the second compressor by-pass valve, the second compressor of bottoming cycle, bottoming cycle high temperature regenerator, the first back-end ductwork heater point
Flow valve, the first back-end ductwork heater, the second turbine of the first turbine of bottoming cycle, the second back-end ductwork heater and bottoming cycle；
Wherein the first back-end ductwork heater and the second back-end ductwork heater are arranged in boiler back end ductwork；First back-end ductwork adds
Hot device outlet converges with the on high-tension side outlet of bottoming cycle high temperature regenerator and is connected afterwards with the entrance of the first turbine of bottoming cycle, bottoming cycle
The outlet of first turbine, the inlet/outlet of the second back-end ductwork heater, the inlet/outlet of the second turbine of bottoming cycle, bottoming cycle high temperature return
The inlet/outlet of hot device low-pressure side is connected with the entry sequence of bottoming cycle cryogenic regenerator low-pressure side working medium pipeline；Bottoming cycle low temperature returns
The outlet of hot device low-pressure side working medium pipeline is connected with bottoming cycle cooler and bottoming cycle the second compressor by-pass valve respectively, and bottom is followed
The outlet of ring cooler and the inlet/outlet of the first compressor of bottoming cycle, the high pressure side inlet sequence phase of bottoming cycle cryogenic regenerator
Even, bottoming cycle the second compressor by-pass valve is connected with the second suction port of compressor of bottoming cycle, the high pressure of bottoming cycle cryogenic regenerator
Side outlet and the second compressor outlet of bottoming cycle converge after respectively with bottoming cycle high temperature regenerator high pressure side inlet and the first tail portion
Flue heater by-pass valve entrance is connected, the outlet of the first back-end ductwork heater by-pass valve and the first back-end ductwork heater
Entrance is connected.
The second back-end ductwork heater and the first back-end ductwork heater be arranged in juxtaposition in back-end ductwork or
Person arranges up and down；
When the second back-end ductwork heater and the first back-end ductwork heater are arranged up and down in back-end ductwork
When, the first back-end ductwork heater is in lower section and closer flue outlet
The flow flowed through in the first back-end ductwork heater by-pass valve accounts for the 9.82-11.38% of total flow.
The air preheater endothermic system includes：Primary air fan, overfire air fan and air preheater；Wherein primary air fan
It is connected with overfire air fan entrance with external environment, primary air fan outlet exports primary with air preheater respectively with overfire air fan
Wind entrance is connected with Secondary Air entrance, and the First air outlet of air preheater is connected with the pulverized coal preparation system of boiler, air preheater
Secondary Air outlet be connected with boiler furnace,
First air accounting in the air preheater is 19%, and for the maximum temperature of First air at 320 DEG C, the air is pre-
Secondary Air accounting in hot device is 81%, 380 DEG C of the maximum temperature of Secondary Air.
It it is 115-125 DEG C by the air preheater endothermic system flue gas after cooling.
Beneficial effects of the present invention are：
The invention is directed to supercritical CO2Brayton cycle is applied to coal-fired power generation field, it is proposed that one kind being suitable for combustion
The Novel supercritical CO in coal power generation field2Combined cycle system, the system are pre- by pushing up the circulatory system, bottom cycle system, air
Hot device endothermic system three's collective effect can fully absorb the heat that coal combustion generates in boiler.
The heat that coal combustion generates is absorbed by the top circulatory system first, and the heat that the top circulatory system cannot fully absorb is the bottom of by
The circulatory system absorbs, and the waste heat that the flue gas being discharged through bottom cycle system is included is inhaled in air preheater endothermic system by air
It receives, last flue gas is discharged into after being cooled to 120 DEG C or so in environment.
The system is characterized in that the second back-end ductwork heater of bottom cycle system imports and exports CO2The working medium temperature difference is smaller,
When the inlet pressure of the first turbine of bottoming cycle is 20MPa, the temperature difference is than low 28 DEG C or so of recompression cycle, than single backheat cloth
Low 100 DEG C or so of thunder cycle, this characteristic make the cycle be suitably applied the slightly lower operating mode of top cycle turbine inlet temperature,
This makes the combined-circulation that can realize conjunction in the wide warm area between 580-640 DEG C in top cycle turbine inlet temperature
Reason, efficient power generation, and the volume of air preheater can maintain under the level that the prior art can be realized.
The combined-circulation solves S-CO2The back-end ductwork waste heat problem that coal fired power generation faces, and the boiler of electricity generation system
Efficiency and cycle efficieny are all higher, are a kind of efficient S-CO2Coal fired power generation combined cycle system.
Description of the drawings
Fig. 1 is a kind of Novel supercritical CO suitable for coal-fired power generation field of the present invention2Combined cycle system embodiment
Flow chart；
In figure：1- pushes up recirculation cooler, the tops 2- the first compressor of cycle, the tops 3- cycle cryogenic regenerator, the tops 4- cycle the
Two compressor by-pass valves, the tops 5- the second compressor of cycle, 6- push up cyclic high-temperature regenerator, and 7- pushes up combined-circulation once-through boiler first and heats
Device, the tops 8- the first turbine of cycle, 9- push up combined-circulation once-through boiler secondary heater, the tops 10- the second turbine of cycle, and 11- pushes up combined-circulation once-through boiler the
Three heaters, the tops 12- cycle third turbine, 213- bottoming cycle coolers, the first compressor of 214- bottoming cycles, 215- bottoming cycles are low
Warm regenerator, 216- bottoming cycles the second compressor by-pass valve, the second compressor of 217- bottoming cycles, 218- bottoming cycle high temperature backheats
Device, 219- the first back-end ductwork heater by-pass valves, the first back-end ductworks of 220- heater, the first turbine of 221- bottoming cycles,
222- the second back-end ductwork heaters, the second turbine of 223- bottoming cycles, 324- primary air fans, 325- overfire air fans, 326- air
Preheater.
Specific implementation mode
A kind of the present invention is further explained below in conjunction with the accompanying drawings Novel supercritical CO suitable for coal-fired power generation field2It is compound
The embodiment of the circulatory system；
As shown in Figure 1, the present embodiment includes：Push up the circulatory system 100, bottom cycle system 200 and air preheater heat absorption system
System 300, wherein each heater in the circulatory system 100 of top is arranged in the leading portion of burner hearth and horizontal flue, back-end ductwork, bottom is followed
The heater of loop system 200 is arranged in boiler back end ductwork stage casing, and flue gas flows through bottoming cycle after first flowing through the top circulatory system 100
System 200, the flue gas for flowing through bottom cycle system 200 enter air preheater endothermic system 300 in back-end ductwork back segment, three
System collective effect absorbs the heat that coal combustion generates in boiler；For coal in Boiler Furnace chamber inner combustion, the flue gas after burning flows through cigarette
Road is finally discharged into environment；
The heat that coal combustion generates is absorbed by the top circulatory system 100 first, the heat that the top circulatory system 100 cannot fully absorb
Amount is absorbed by bottom cycle system 200, and the waste heat that the flue gas being discharged through bottom cycle system 200 is included absorbs heat in air preheater is
It is absorbed by air in system 300, last flue gas is discharged into after being cooled to 120 DEG C or so in environment.
Pushing up the circulatory system 100 includes：Top recirculation cooler 1, top recycle the first compressor 2, top recycles cryogenic regenerator 3,
Top the second compressor by-pass valve 4 of cycle, top the second compressor 5 of cycle, top cyclic high-temperature regenerator 6, top combined-circulation once-through boiler first
Heater 7, top the first turbine 8 of cycle, top combined-circulation once-through boiler secondary heater 9, top the second turbine 10 of cycle, top combined-circulation once-through boiler third
Heater 11 and top cycle third turbine 12；Wherein top combined-circulation once-through boiler primary heater 7, top combined-circulation once-through boiler secondary heater 9, top
Combined-circulation once-through boiler third heater 11 is arranged in the leading portion of boiler furnace, horizontal flue and back-end ductwork, pushes up combined-circulation once-through boiler first
The inlet/outlet, 9 inlet/outlet of top combined-circulation once-through boiler secondary heater, top cycle second of the outlet of heater 7 and top the first turbine 8 of cycle
10 inlet/outlet of turbine, 11 inlet/outlet of top combined-circulation once-through boiler third heater, 12 inlet port of top cycle third turbine, top cyclic high-temperature
The inlet/outlet of 6 low-pressure side of regenerator is sequentially connected with top cycle 3 low pressure side inlet of cryogenic regenerator；Top cycle cryogenic regenerator 3
The outlet of low-pressure side working medium pipeline is connected with top recirculation cooler 1 and top the second compressor by-pass valve 4 of cycle respectively, wherein pushing up
The outlet of recirculation cooler 1, top cycle 2 inlet/outlet of the first compressor are connected with top cycle cryogenic regenerator 3 high pressure side inlet sequence,
Top the second compressor by-pass valve 4 of cycle is connected with top cycle 5 entrance of the second compressor, top 3 high-pressure side of cycle cryogenic regenerator
It is connected with 6 high pressure side inlet of top cyclic high-temperature regenerator after outlet converges with top the second compressor 5 of cycle outlet, pushes up cyclic high-temperature
6 high pressure side outlet of regenerator is connected with top 7 entrance of combined-circulation once-through boiler primary heater；
It is the higher double reheat recompression cycle of cycle efficieny to push up the circulatory system 100, and the top circulatory system 100 absorbs coal
90% or so heat produced by burning.
Bottom cycle system 200 includes：Bottoming cycle cooler 213, the first compressor of bottoming cycle 214, bottoming cycle low temperature backheat
Device 215, the second compressor of bottoming cycle by-pass valve 216, the second compressor of bottoming cycle 217, bottoming cycle high temperature regenerator 218,
One back-end ductwork heater by-pass valve 219, the first back-end ductwork heater 220, bottoming cycle the first turbine 221, the second tail portion
Flue heater 222 and the second turbine of bottoming cycle 223；Wherein the first back-end ductwork heater 220 and the heating of the second back-end ductwork
Device 222 is arranged in boiler back end ductwork；First back-end ductwork heater 220 exports and 218 high pressure of bottoming cycle high temperature regenerator
Side outlet is connected after converging with 221 entrance of the first turbine of bottoming cycle, and the outlet of the first turbine of bottoming cycle 221, the second back-end ductwork add
The inlet/outlet of hot device 222, the inlet/outlet of the second turbine of bottoming cycle 223,218 low-pressure side of bottoming cycle high temperature regenerator inlet/outlet with
The entry sequence of 215 low-pressure side working medium pipeline of bottoming cycle cryogenic regenerator is connected；215 low-pressure side working medium of bottoming cycle cryogenic regenerator
The outlet of pipeline is connected with bottoming cycle cooler 213 and the second compressor of bottoming cycle by-pass valve 216 respectively, bottoming cycle cooler
213 outlets are connected with the high pressure side inlet sequence of the inlet/outlet of the first compressor of bottoming cycle 214, bottoming cycle cryogenic regenerator 215,
The second compressor of bottoming cycle by-pass valve 216 is connected with 217 entrance of the second compressor of bottoming cycle, bottoming cycle cryogenic regenerator 215
The outlet of high pressure side outlet and the second compressor of bottoming cycle 217 converge after enter respectively with 218 high-pressure side of bottoming cycle high temperature regenerator
Mouthful be connected with 219 entrance of the first back-end ductwork heater by-pass valve, the first back-end ductwork heater by-pass valve 219 export and
First back-end ductwork heater, 220 entrance is connected.
In the present embodiment, the first back-end ductwork heater 220 in bottom cycle system 200 and the heating of the second back-end ductwork
Device 222 is arranged in juxtaposition in back-end ductwork, the CO of the second back-end ductwork heater 222 inlet and outlet2The working medium temperature difference is smaller, when bottom is followed
When the inlet pressure of the first turbine of ring 221 is 20MPa, the temperature difference is than low 28 DEG C or so of recompression cycle, than single backheat mine-laying
Pause and recycle low 100 DEG C or so, it is more slightly lower than top cycle turbine inlet temperature that this characteristic makes this bottom cycle system be suitably applied
Operating mode.Bottoming cycle flow accounts for the 10.90-13.21% of top cycle and bottoming cycle total flow；It should be noted that second in the present embodiment
Back-end ductwork heater 222 can also arrange that flue gas first passes through the second tail portion at this time up and down with the first back-end ductwork heater 220
After flue heater 222, using the first back-end ductwork heater 220.
Bottom cycle system 200 recycles for progressive solution, is a kind of new circulating-heating pattern, which can follow on top
Ring turbine (top combined-circulation once-through boiler primary heater 7, top combined-circulation once-through boiler secondary heater 9, top combined-circulation once-through boiler third heater 11)
Outlet temperature is within the scope of 580-640 DEG C so that combined cycle system efficiency is higher；And it pushes up in the circulatory system 100 and pushes up combined-circulation once-through boiler
The inlet temperature of primary heater 7 is 486-536 DEG C, and top combined-circulation once-through boiler secondary heater 9 and top combined-circulation once-through boiler third add
The inlet temperature of hot device 11 is all 523-578 DEG C；Any one in two above inlet temperature may each be bottom
The optimum working temperature range of the circulatory system 200；When bottom cycle system 200 selects 486-536 DEG C of temperature range, air is pre-
Secondary Air temperature in hot device endothermic system 300 is relatively low, empty when bottom cycle system 200 selects 523-578 DEG C of temperature range
Secondary Air temperature in air preheater endothermic system 300 is higher, but no matter height Secondary Air temperature is all within 381 DEG C, therefore
When the outlet temperature range of the second back-end ductwork heater 222 in bottom cycle system 200 is when between 486-578 DEG C, bottoming cycle
System 200 is in best operating temperature range.
Air preheater endothermic system 300 includes：Primary air fan 324, overfire air fan 325 and air preheater 326；Wherein
The entrance of air preheater endothermic system 300 is external environment, and the entrance of air preheater endothermic system 300 is primary air fan
324 are connected with the entrance of overfire air fan 325, primary air fan 324 with 325 entrance of overfire air fan with external environment, primary air fan 324
Outlet is connected with the First air entrance of air preheater 326 and Secondary Air entrance respectively with the outlet of overfire air fan 325, air preheat
The outlet of 326 First air of device is connected with the pulverized coal preparation system of boiler, and the outlet of 326 Secondary Air of air preheater is connected with boiler furnace, empty
326 Secondary Air of air preheater enters boiler furnace by overfire air port, and sufficient air is provided for burning of coal.Air preheat
First air accounting 19% or so in device, the maximum temperature of First air is at 320 degree or so, Secondary Air accounting 81% or so, Secondary Air
380 degree of maximum temperature.
In the present embodiment, workflow of the supercritical carbon dioxide working medium in the circulatory system is divided into top cycle and bottoming cycle
Two parts；
Pushing up the workflow recycled is：Supercritical carbon dioxide working medium recycles 3 low-pressure side working medium tube of cryogenic regenerator on top
(state of working medium is at this time for the outlet in road：90.88-95.24 DEG C, 7.70MPa) shunting, wherein flowing through top recirculation cooler all the way
1, CO after cooling2(state of working medium is working medium at this time：32.00 DEG C, 7.60MPa) enter top the first compressor 2 of cycle, it is pushing up
Recycle in the first compressor 2 that (state of working medium is at this time after compression：80.88-85.24 DEG C, 30.05-33.28MPa) enter top
Recycle cryogenic regenerator 3 high-pressure side, in 3 high-pressure side of cycle cryogenic regenerator of top with low temperature side CO2Working medium exchanges heat, and another way exists
Flow through top cycle the second compressor by-pass valve 4 after enter top cycle the second compressor 5 (state of working medium is at this time：90.88-
95.24 DEG C, 7.70MPa, the flow flowed through in the second compressor by-pass valve 4 accounts for the 33.21-31.64% of total flow), it is pushing up
It recycles in the second compressor 5 and converges (the state of working medium at this time with top cycle 3 high pressure side outlet working medium of cryogenic regenerator after compression
For：227.46-244.45 DEG C, 29.95-33.18MPa), the working medium after converging enters 6 high-pressure side of top cyclic high-temperature regenerator,
Entering top combined-circulation once-through boiler primary heater 7 after exchanging heat with low-pressure side working medium, (state of working medium is at this time：486.31-535.27 DEG C,
29.85-33.08MPa), on top, combined-circulation once-through boiler primary heater 7 enters top cycle after absorbing the heat that coal combustion generates in boiler
(state of working medium is first turbine 8 at this time：580.00-640.00 DEG C, 28.00-32.00MPa), recycle the first turbine 8 on top
(state of working medium is at this time after interior acting：524.16-575.52 DEG C, 18.36-20.07MPa) add into top combined-circulation once-through boiler second
Hot device 9 absorbs the heat that coal combustion generates in boiler, and (state of working medium is the working medium after heat absorption at this time：580.00-640.00
DEG C, 18.11-19.89MPa) enter top the second turbine 10 of cycle, (the working medium at this time in the second turbine 10 of cycle of top after acting
State is：526.93-577.84 DEG C, 12.04-12.59MPa) enter coal in 11 absorption boiler of top combined-circulation once-through boiler third heater
Burn the heat generated, and (state of working medium is the working medium after heat absorption at this time：580.00-640.00 DEG C, 11.71-12.36MPa)
Into top cycle third turbine 12, (state of working medium is at this time after acting in top cycle third turbine 12：529.51-
580.09 DEG C, 7.90MPa) enter 6 low-pressure side of top cyclic high-temperature regenerator and transfers heat to low-pressure side, the CO after heat transfer2Work
(state of working medium is matter at this time：237.46-254.45 DEG C, 7.80MPa) enter top cycle 3 low-pressure side of cryogenic regenerator by heat
High-pressure side is passed to, so far CO2Working medium completes a cycle in top recycles；Temperature reduces (at this time after flue gas flows through top cycle
The temperature range of flue gas：564.16-615.52℃).
By pushing up combined-circulation once-through boiler primary heater 7, top combined-circulation once-through boiler secondary heater 9, top combined-circulation once-through boiler in top recycles
Third heater 11 can absorb in stove 90% or so heat.Subsequent remaining heat will further be inhaled by bottom cycle system
It receives.
The workflow of bottoming cycle is：Supercritical carbon dioxide working medium is in 215 low-pressure side working medium of bottoming cycle cryogenic regenerator
(state of working medium is at this time for the outlet of pipeline：67.42-81.22 DEG C, 7.70MPa) shunting, wherein flowing through bottoming cycle cooling all the way
Device 213, CO after cooling2(state of working medium is working medium at this time：32.00 DEG C, 7.60MPa) enter the first compressor of bottoming cycle
214, (state of working medium is at this time after compression in the first compressor of bottoming cycle 214：57.42-71.22 DEG C, 16.26-
23.66MPa) enter 215 high-pressure side of bottoming cycle cryogenic regenerator, in 215 high-pressure side of bottoming cycle cryogenic regenerator and low temperature side
CO2Working medium exchanges heat, and another way enters the second compressor of bottoming cycle 217 after flowing through the second compressor of bottoming cycle by-pass valve 216
(state of working medium is at this time：67.42-81.22 DEG C, 7.70MPa, the flow flowed through in the second compressor by-pass valve 4 accounts for total stream
The 45.41-37.19% of amount), go out with 215 high-pressure side of bottoming cycle cryogenic regenerator after compression in the second compressor of bottoming cycle 217
Mouthful working medium converges that (state of working medium is at this time：134.88-189.56 DEG C, 16.16-23.56MPa), the working medium after converging is again
It is shunted, wherein fluid is through 219 (the first back-end ductwork heater flow divider of the first back-end ductwork heater by-pass valve all the way
The flow flowed through in door 219 accounts for the 9.82-11.38% of total flow) enter the heat absorption of the first back-end ductwork heater 220, another way
CO2Working medium enters 218 high-pressure side of bottoming cycle high temperature regenerator and absorbs the heat that low-pressure side is transmitted, and in bottoming cycle high temperature regenerator
218 low side outlets and the CO after the heat absorption of the first back-end ductwork heater 2202Working medium converges that (state of working medium is at this time：
434.77-458.78 DEG C, 16.06-23.46MPa), the working medium after converging enters the acting of the first turbine of bottoming cycle 221, after acting
CO2(state of working medium is working medium at this time：395.23-395.31 DEG C, 11.29-13.66MPa) add into the second back-end ductwork
Hot device 222 absorbs the waste heat of pot inner flue gas of the stove, and (state of working medium is the working medium after heat absorption at this time：486.31-535.27 DEG C,
11.19-13.56MPa) enter the second turbine of bottoming cycle 223 to do work, the working medium after acting enters bottoming cycle high temperature regenerator 218
(state of working medium is low-pressure side at this time：444.75-468.77 DEG C, 7.90MPa) high-pressure side working medium is transferred heat to, after heat release
CO2Working medium enters 215 low-pressure side of bottoming cycle cryogenic regenerator, and (state of working medium is at this time：144.88-199.56 DEG C,
7.80MPa), and high-pressure side working medium is transferred heat to, so far CO2Working medium completes a cycle in bottoming cycle；Flue gas flows through
(temperature of flue gas is at this time for temperature reduction after bottoming cycle：430-440 DEG C or so).
Second back-end ductwork heater 222 of bottom cycle system 200 imports and exports CO2The working medium temperature difference is smaller, when bottoming cycle
When the inlet pressure of one turbine 221 is 20MPa, which follows than low 28 DEG C or so of recompression cycle than single backheat Bretton
Low 100 DEG C or so of ring, this characteristic make the cycle be suitably applied the slightly lower operating mode of top cycle turbine inlet temperature.Bottoming cycle
Flow accounts for the 10.90-13.21% of top cycle and bottoming cycle total flow.
Flue gas CO in bottoming cycle2After working medium heat absorption, a part of heat is there remains, which will be by air preheater
System absorbs, and what is flowed in air preheater is air and flue gas, and flue gas transfers heat to air, and the air after heat absorption is divided into
First air and Secondary Air, wherein First air enter carrying coal dust in pulverized coal preparation system and enter hearth combustion, and Secondary Air enters burner
Assistant coal burns.
Primary air fan 324, overfire air fan 325 absorb air from external environment, and air is sent into air preheater 326
(wind-warm syndrome at this time：31.00 DEG C, secondary air temperature：21.00 DEG C) and flue gas heat exchange, the First air (First air at this time after heat absorption
Temperature：320.00 DEG C) enter pulverized coal preparation system and carries coal dust and enter boiler, the Secondary Air (secondary air temperature at this time after heat absorption：380.00
DEG C) enter burner for combustion-supporting.It it is 115-125 DEG C or so by air cooled flue gas, remaining heat will in last flue gas
It is discharged into environment as waste heat.
Claims (10)
1. a kind of Novel supercritical CO suitable for coal-fired power generation field2Combined cycle system, which is characterized in that including：Top cycle
System (100), bottom cycle system (200) and air preheater endothermic system (300), wherein each in the top circulatory system (100)
Heater is arranged in the leading portion of boiler furnace, horizontal flue and back-end ductwork, and the heater of bottom cycle system (200) is arranged in
In boiler back end ductwork stage casing, flue gas flows through bottom cycle system (200) after first flowing through the top circulatory system (100), flows through bottoming cycle
The flue gas of system (200) enters the air preheater endothermic system (300) in back-end ductwork back segment, and the heat that coal combustion generates is first
It is first absorbed by the top circulatory system (100), the heat that the top circulatory system (100) cannot fully absorb is inhaled by bottom cycle system (200)
It receives, the waste heat that the flue gas being discharged through bottom cycle system (200) is included is inhaled in air preheater endothermic system (300) by air
It receives.
2. a kind of Novel supercritical CO suitable for coal-fired power generation field according to claim 12Combined cycle system,
It is characterized in that, the top circulatory system (100) includes：It is low to push up recirculation cooler (1), top the first compressor of cycle (2), top cycle
Warm regenerator (3), top the second compressor by-pass valve (4) of cycle, top the second compressor of cycle (5), top cyclic high-temperature regenerator
(6), top combined-circulation once-through boiler primary heater (7), top the first turbine of cycle (8), top combined-circulation once-through boiler secondary heater (9), top cycle
Second turbine (10), top combined-circulation once-through boiler third heater (11) and top cycle third turbine (12)；Wherein, combined-circulation once-through boiler first is pushed up
Heater (7), top combined-circulation once-through boiler secondary heater (9) and top combined-circulation once-through boiler third heater (11) are arranged in boiler furnace, water
In the leading portion of flat flue and back-end ductwork, the outlet of top combined-circulation once-through boiler primary heater (7) and entering for top cycle the first turbine (8)
Outlet, top combined-circulation once-through boiler secondary heater (9) inlet/outlet, top cycle the second turbine (10) inlet/outlet, top combined-circulation once-through boiler third add
Hot device (11) inlet/outlet, top cycle third turbine (12) inlet port, push up cyclic high-temperature regenerator (6) low-pressure side inlet/outlet with
Top cycle cryogenic regenerator (3) low pressure side inlet is sequentially connected；The outlet of top cycle cryogenic regenerator (3) low-pressure side working medium pipeline
It is connected respectively with top recirculation cooler (1) and top the second compressor by-pass valve (4) of cycle, wherein top recirculation cooler (1)
Outlet, top cycle the first compressor (2) inlet/outlet are connected with top cycle cryogenic regenerator (3) on high-tension side entry sequence, and top is followed
Ring the second compressor by-pass valve (4) is connected with the entrance of top the second compressor of cycle (5), and top cycle cryogenic regenerator (3) is high
Converge rear and top cyclic high-temperature regenerator (6) on high-tension side entrance in the outlet of the outlet and top the second compressor of cycle (5) of pressing side
It is connected, the on high-tension side outlet of top cyclic high-temperature regenerator (6) is connected with the entrance of top combined-circulation once-through boiler primary heater (7).
3. a kind of Novel supercritical CO suitable for coal-fired power generation field according to claim 22Combined cycle system,
It is characterized in that, the flow flowed through in the second compressor by-pass valve (4) accounts for the 33.21-31.64% of total flow.
4. a kind of Novel supercritical CO suitable for coal-fired power generation field according to claim 12Combined cycle system,
It is characterized in that, top combined-circulation once-through boiler primary heater (7), top combined-circulation once-through boiler secondary heater (9) in the top circulatory system (100)
And the outlet temperature of top combined-circulation once-through boiler third heater (11) is all between 580-640 DEG C；In the bottom cycle system (200)
Two back-end ductwork heater (222) outlet temperature ranges are between 486-578 DEG C.
5. a kind of Novel supercritical CO suitable for coal-fired power generation field according to claim 12Combined cycle system,
It is characterized in that, the bottom cycle system (200) includes：Bottoming cycle cooler (213), the first compressor of bottoming cycle (214), bottom are followed
Ring cryogenic regenerator (215), bottoming cycle the second compressor by-pass valve (216), the second compressor of bottoming cycle (217), bottoming cycle
High temperature regenerator (218), the first back-end ductwork heater by-pass valve (219), the first back-end ductwork heater (220), bottom are followed
The first turbine of ring (221), the second back-end ductwork heater (222) and the second turbine of bottoming cycle (223)；Wherein the first back-end ductwork
Heater (220) and the second back-end ductwork heater (222) are arranged in boiler back end ductwork；First back-end ductwork heater
(220) outlet converges rear and the first turbine of bottoming cycle (221) entrance with the on high-tension side outlet of bottoming cycle high temperature regenerator (218)
It is connected, the outlet of the first turbine of bottoming cycle (221), the inlet/outlet of the second back-end ductwork heater (222), the second turbine of bottoming cycle
(223) inlet/outlet and bottoming cycle cryogenic regenerator (215) low pressure of inlet/outlet, bottoming cycle high temperature regenerator (218) low-pressure side
The entry sequence of side working medium pipeline is connected；The outlet of bottoming cycle cryogenic regenerator (215) low-pressure side working medium pipeline follows the bottom of with respectively
Ring cooler (213) is connected with bottoming cycle the second compressor by-pass valve (216), the outlet and bottom of bottoming cycle cooler (213)
The high pressure side inlet sequence of the inlet/outlet, bottoming cycle cryogenic regenerator (215) that recycle the first compressor (214) is connected, bottoming cycle
Second compressor by-pass valve (216) is connected with the second compressor of bottoming cycle (217) entrance, bottoming cycle cryogenic regenerator (215)
The outlet of high pressure side outlet and the second compressor of bottoming cycle (217) converge after respectively with bottoming cycle high temperature regenerator (218) high pressure
Side entrance is connected with first back-end ductwork heater by-pass valve (219) entrance, the first back-end ductwork heater by-pass valve
(219) outlet is connected with first back-end ductwork heater (220) entrance.
6. a kind of Novel supercritical CO suitable for coal-fired power generation field according to claim 52Combined cycle system,
It is characterized in that, the second back-end ductwork heater (222) and the first back-end ductwork heater (220) are in back-end ductwork
It is arranged in juxtaposition or arranges up and down；
On the second back-end ductwork heater (222) and the first back-end ductwork heater (220) are in back-end ductwork
When lower arrangement, the first back-end ductwork heater (220) is in lower section and closer flue outlet.
7. a kind of Novel supercritical CO suitable for coal-fired power generation field according to claim 52Combined cycle system,
It is characterized in that, the flow flowed through in the first back-end ductwork heater by-pass valve (219) accounts for the 9.82- of total flow
11.38%.
8. a kind of Novel supercritical CO suitable for coal-fired power generation field according to claim 12Combined cycle system,
It is characterized in that, the air preheater endothermic system (300) includes：Primary air fan (324), overfire air fan (325) and air are pre-
Hot device (326)；Wherein primary air fan (324) is connected with overfire air fan (325) entrance with external environment, and primary air fan (324) goes out
Mouth is connected with the First air entrance of air preheater (326) and Secondary Air entrance respectively with overfire air fan (325) outlet, and air is pre-
The First air outlet of hot device (326) is connected with the pulverized coal preparation system of boiler, the Secondary Air outlet of air preheater (326) and Boiler Furnace
Thorax is connected.
9. a kind of Novel supercritical CO suitable for coal-fired power generation field according to claim 82Combined cycle system,
It is characterized in that, the First air accounting in the air preheater (326) is 19%, and the maximum temperature of First air is described at 320 DEG C
Secondary Air accounting in air preheater (326) is 81%, 380 DEG C of the maximum temperature of Secondary Air.
10. a kind of Novel supercritical CO suitable for coal-fired power generation field according to claim 12Combined cycle system,
It is characterized in that, is 115-125 DEG C by the air preheater endothermic system (300) flue gas after cooling.
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| CN109372600A (en) * | 2018-10-22 | 2019-02-22 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Improved high-efficiency backheat coal base supercritical CO2Double reheat electricity generation system |
| CN111005780A (en) * | 2019-12-19 | 2020-04-14 | 华北电力大学 | Supercritical CO for thoroughly solving waste heat problem2Coal-fired power generation system |
| CN111219218A (en) * | 2020-03-11 | 2020-06-02 | 西安热工研究院有限公司 | Coal-based supercritical carbon dioxide power generation system with waste heat recovery function and method |
| CN111622817A (en) * | 2020-06-08 | 2020-09-04 | 华北电力大学 | Coal-fired power generation system and S-CO thereof2Circulation system |
| CN113756892A (en) * | 2021-08-30 | 2021-12-07 | 西安交通大学 | Modularized multipurpose small-sized villaumite cooling high-temperature reactor energy system |
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