CN108180470B - The fire coal circulating fluid bed boiler of supercritical carbon dioxide and electricity generation system and electricity-generating method - Google Patents
The fire coal circulating fluid bed boiler of supercritical carbon dioxide and electricity generation system and electricity-generating method Download PDFInfo
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- CN108180470B CN108180470B CN201711210273.9A CN201711210273A CN108180470B CN 108180470 B CN108180470 B CN 108180470B CN 201711210273 A CN201711210273 A CN 201711210273A CN 108180470 B CN108180470 B CN 108180470B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
- F23C10/08—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases
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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
- 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
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
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- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a kind of fire coal circulating fluid bed boiler of supercritical carbon dioxide and electricity generation system and electricity-generating methods, boiler includes burner hearth, separator, back-end ductwork and the external heat exchanger in separator feed back section, cooling wall and medium temperature overheater are equipped in burner hearth, equipped with high temperature reheater and the low temperature superheater being connected to respectively with cooling wall and medium temperature overheater in external heat exchanger, low-temperature reheater is equipped in back-end ductwork, high temperature superheater, higher level's economizer, subordinate's economizer and air preheater, wherein, high temperature superheater is connected to medium temperature overheater, low-temperature reheater is connected to high temperature reheater；The working medium of boiler is supercritical carbon dioxide.Boiler of the present invention can effectively control cooling wall wall temperature, ensure boiler safety reliability service and the thermal efficiency is high；Generating set tends to minimize, and has faster load responding speed, and depth peak regulation is adaptable, gives full play to coal resources advantage, improves energy utilization rate, ensures energy security.
Description
Technical field
The present invention relates to a kind of boiler more particularly to a kind of fire coal circulating fluid bed boiler of supercritical carbon dioxide and power generations
System and electricity-generating method belong to Coal Clean, efficiency power generation technical field.
Background technology
Currently, the primary energy structure based on coal determines that the following long-term internal combustion coal thermal power generation is still main flow direction, it is existing
Have that fired power generating unit energy consumption is big compared with high, pollutant and greenhouse gas emissions, and develop 700 DEG C of ultra-high parameter extra-supercritical units by
Ensure power industry there is an urgent need for developing the novel coal generation technology of clean and effective to the limitation of material cost and manufacture level
Sustainable development.
Supercritical carbon dioxide has high-energy density, good flowing and heat-transfer character, turbine in Near The Critical Point
Tool volume reduces at double, and system structure is compact, and carbon dioxide chemistry property torpescence, reduces development ultra-high parameter unit pair
The requirement of material.Meanwhile using supercritical carbon dioxide being the Closed Brayton Power Cycle electricity generation system of working medium in equivalent parameters condition
Conversion efficiency of thermoelectric more higher than steam Rankine cycle can be achieved down becomes hot spot in recent years by extensive concern both domestic and external
One of research direction.
Traditional pulverized-coal fired boiler is higher to coal quality requirements, smoke temperature level is higher in stove, heat load distribution is uneven, Load Regulation
Range is relatively narrow, and needs to install the out of stock device of additional desulfurization additional, and investment and operating cost improve.In contrast, recirculating fluidized bed
Boiler coal wide adaptability, Pollution drainage is few, combustion intensity is big, due to the presence of a large amount of high temperature bed materials in stove, when underload
Can guarantee the stability of burning and higher efficiency of combustion, load regulation range is wide, by limestone desulfurization cheap in stove and
Optimize fractional combustion, can effectively inhibit sulphur, nitrogen pollutant discharge.
Supercritical carbon dioxide cycle applied to fossil fuel field is directed to pulverized-coal fired boiler mostly, also has a small number of be directed to follow
Circulation fluidized bed boiler, but the cooling wall entrance Temperature of Working of these boilers is very high, if turbine entrance fluid properties be 600 DEG C/
620 DEG C/28Mpa, designed cooling wall entrance Temperature of Working is 510 DEG C~530 DEG C；Simultaneously, it has been suggested that main compressor go out
The working medium of mouth or cryogenic regenerator high pressure side outlet lower temperature is further separated into economizer, under the temperature conditions for ensureing hot-air,
The irreversible loss that economizer can be caused larger, and compressor inlet pressure is associated with turbine exhaust pressure thight, system is flexible
Property is relatively low.
Existing efficiency of thermal power unit raising relies primarily on raising steam parameter, and the high temperature that steam parameter is limited to material is strong
Degree, high-temperature oxidation resistant corrosive nature and welding, processing technology, 700 DEG C of grade high tensile materials are up for further researching and developing, and 700
The components such as the boiler finishing superheater of DEG C grade supercritical unit, final reheater, main pipeline, steam turbine high-temperature section need to use height
High nickel-bass alloy material, causes cost of investment to improve, and overall economy quality declines, and unit volume is big, and effect is run under underload
Rate is low, cannot meet peak regulation demand.
Invention content
Goal of the invention：The first object of the present invention be to provide a kind of layout optimization based on supercritical carbon dioxide working medium and
The high circulating fluidized bed boiler of the thermal efficiency；The second object of the present invention is to provide the power generation system driven by the circulating fluidized bed boiler
System；The third object of the present invention is to provide the electricity-generating method of the electricity generation system.
Technical solution：The fire coal circulating fluid bed boiler of supercritical carbon dioxide of the present invention, including burner hearth, separation
Device, back-end ductwork and the external heat exchanger in separator feed back section, the burner hearth is interior to be equipped with cooling wall and medium temperature overheat
Device, the external heat exchanger are interior equipped with high temperature reheater and the cryogenic overheating being connected to respectively with cooling wall and medium temperature overheater
Device, the back-end ductwork is interior to be equipped with low-temperature reheater, high temperature superheater, higher level's economizer, subordinate's economizer and air preheater,
Wherein, the high temperature superheater is connected to medium temperature overheater, and low-temperature reheater is connected to high temperature reheater；The working medium of the boiler
For supercritical carbon dioxide.
Preferably, high temperature superheater outlet Temperature of Working is 560~700 DEG C, and pressure is 25~35Mpa；High temperature is again
Hot device outlet Temperature of Working is 560 DEG C~700 DEG C, and pressure is 12~14Mpa；The cooling wall entrance Temperature of Working is 420 DEG C
~540 DEG C.In the present invention, cooling wall inlet temperature reduces by 40~60 DEG C or so compared to existing supercritical carbon dioxide boiler,
Lower working medium entrances temperature is conducive to the control and heat transfer of tube wall temperature.
In the present invention, back-end ductwork is divided into the preceding flue and rear pass being mutually parallel by midfeather, wherein preceding flue
Interior arrangement low-temperature reheater, rear pass is interior to arrange that high temperature superheater and higher level's economizer, front and back flue close along flue gas circulating direction
Subordinate's economizer and air preheater are respectively arranged after and from top to bottom.Wherein, economizer two stage arrangement advantageously reduces high temperature
The thermal deviation of economizer, midfeather shunt flue gas, and front and back flue is arranged in juxtaposition reheater, superheater and economizer, effectively drop
Low smoke temperature.
Further, setting spray carbon dioxide attemperator between medium temperature overheater outlet and high temperature superheater entrance.
Ash control valve can also be arranged between the tail portion of separator and the entrance of external heat exchanger in the present invention.
The cooling wall uses membrane wall vertical tube Folding-Screen, from bottom to top respectively riffled tube, mixing header and light pipe, because
Higher for entrance Temperature of Working, exchange capability of heat reduces, and the convex-concave surface in lower internal thread pipe can reduce wall with augmentation of heat transfer
Temperature, top light pipe can reduce linear loss again.
The boiler is equipped with primary air fan, overfire air fan and high pressure positive blower using classification air supply mode.
The electricity generation system of recirculating fluidized bed driving of the present invention, including high pressure turbine, low pressure turbine, are driven by high pressure turbine
Dynamic precompactors, main compressor and level-one generator, the recompression machine and secondary generator driven by low pressure turbine；Wherein,
The entrance of the high pressure turbine is connect with high temperature superheater, and outlet is connect with low-temperature reheater, the entrance and high temperature of low pressure turbine
Reheater connects, and outlet is sequentially connected the low pressure side inlet of high temperature regenerator, medium temperature regenerator and cryogenic regenerator；The low temperature returns
The low side outlets of hot device are connected by the entrance of forecooler and precompactors, and the outlet of precompactors is divided into two branches,
In a branch high pressure side inlet of cryogenic regenerator is connected by charge air cooler, main compressor, another branch pass through recompression
Machine connects the low pressure side inlet of cryogenic regenerator high pressure side outlet and medium temperature regenerator；The high pressure side outlet of the medium temperature regenerator
It is divided into two branches, wherein a branch is connect with the high pressure side inlet of high temperature regenerator, another branch is sequentially connected subordinate
Economizer and higher level's economizer, after the outlet of higher level's economizer collects with the high pressure side outlet of high temperature regenerator in connection burner hearth
Cooling wall.
The electricity-generating method of electricity generation system of the present invention, includes the following steps：The high pressure side outlet of the medium temperature regenerator
Working medium shunts, and a part enters the high-pressure side of high temperature regenerator, and another part sequentially enters subordinate's economizer and the higher level of boiler
Economizer, higher level's economizer exit sequentially enter cooling wall, low temperature mistake after being mixed with the working medium of high temperature regenerator high pressure side outlet
Hot device, medium temperature overheater and high temperature superheater heat absorption, do work into high pressure turbine, drive precompactors and main compressor, drive
Level-one electrical power generators, high pressure turbine outlet working medium is again introduced into boiler, laggard through low-temperature reheater and high temperature reheater reheating
Enter low pressure turbine acting, drive recompression machine, drives secondary generator power generation；Low pressure turbine outlet working medium sequentially enters high temperature and returns
The low-pressure side of hot device, medium temperature regenerator and cryogenic regenerator, recycle heat after enter forecooler cool down, forecooler export working medium into
Enter precompactors, precompactors outlet working medium divides two-way, enters recompression machine all the way, and another way enters charge air cooler and main compression
Machine, main compressor export working medium and are mixed with recompression machine outlet working medium after cryogenic regenerator high-pressure side is heated, returned into medium temperature
Hot device high-pressure side heating.
Preferably, the 5~10% of medium temperature regenerator high pressure side outlet working medium sequentially enter subordinate's economizer of boiler and upper
Grade economizer can be used for recycling 350 DEG C~550 DEG C of flue gas heat, exhaust gas temperature be reduced, caused by reduction heat transfer temperature difference is excessive
Irreversible loss, while so that high temperature regenerator low-pressure side working medium is effectively cooling, ensure higher system effectiveness.
The 35~45% of precompactors outlet working medium enter recompression machine, and matching cryogenic regenerator high and low pressure side is changed
The hot temperature difference so that high-pressure side Wen Shengyu low-pressure side temperature drops are suitable, and cryogenic regenerator high pressure side outlet is heated to certain temperature, keeps away
Exempt from regenerator " folder point " problem, improves heat exchanger efficiency.
The generating efficiency is 40~50%, and the multi-stage compression and cooling during rolling link in cycle effectively reduce boiler cooling
Wall inlet temperature widens cycle fluid endothermic temperature section, while improving turbine exhaust pressure and compressor inlet pressure control
Flexibility；The recompression machine shunting matching cryogenic regenerator high and low pressure side temperature difference, improves heat exchanger efficiency；Economizer shunting is effective
Mist heat recovering reduces exhaust gas temperature, improves boiler efficiency；Single reheat further increases system effectiveness.
Advantageous effect：Compared with prior art, the present invention has following remarkable advantage：
(1) circulating fluidized bed boiler of the invention has lower temperature levels (850 DEG C~920 DEG C), uniform heat negative
Lotus and the heat flux distribution characteristic reduced with furnace height increase are conducive to the control of cooling wall wall temperature, ensure boiler safety
Reliability service；Cooling wall inlet temperature reduces by 40~60 DEG C or so compared to existing supercritical carbon dioxide boiler, lower work
Matter inlet temperature is conducive to augmentation of heat transfer and control wall temperature；There are a large amount of high temperature bed materials in Circulation fluidized-bed furnace, there is certain storage
Thermal energy power can guarantee that the stabilization of burning and higher efficiency of combustion, varying duty are adaptable under underload；Calcining is de- repeatedly in stove
Sulphur, optimization air stage feeding effectively reduce sulphur, nitrogen pollutant discharge；
(2) the supercritical carbon dioxide electricity generation system that the present invention is driven by circulating fluidized bed boiler, on the one hand can active set
At recirculating fluidized bed efficient burning, low cost sulfur, the spy that nitrogen pollutant removes and supercritical carbon dioxide system cycle efficieny is high
Point, generating efficiency can be improved 2~5%；On the other hand, electricity generation system effectively reduces cooling by multi-stage compression and cooling during rolling
Wall entrance Temperature of Working widens cycle fluid endothermic temperature range, moreover it is possible to ensure higher system effectiveness；Meanwhile medium temperature backheat
Device high pressure side outlet working medium shunts, and can reduce the irreversible loss of economizer heat exchange, recycles the fume afterheat of tail portion higher temperature,
Reduce exhaust gas temperature；In addition, directly driving compressor with turbine, intermediate energy conversion loss is avoided, improves system effectiveness, together
When main compressor, recompression machine and turbine pressure can realize it is separately adjustable and control；Finally, due to which supercritical carbon dioxide recycles
Pressure ratio is small, and working medium density is higher, and turbomachinery volume is the 1/10~1/30 of conventional vapor turbine, and system integrally tends to be small-sized
Change, cycle generating system flexibility improves, and is suitable for the depth peak regulation of power grid；
(3) electricity-generating method of the present invention can realize efficient, clean electric power generation, and system flexibility is higher, is suitable for electric power depth tune
Peak provides space for regenerative resource is grid-connected.
Description of the drawings
Fig. 1 is boiler of the present invention and the structural schematic diagram of electricity generation system.
Specific implementation mode
Technical scheme of the present invention is described further below in conjunction with the accompanying drawings.
As shown in Figure 1, the circulating fluidized bed boiler of the present invention, burner hearth, separator have been sequentially arranged along flue gas circulating direction
3, back-end ductwork and external heat exchanger.Wherein, arrangement cooling wall 1 and medium temperature overheater 2 in burner hearth, it is preferred that cooling wall 1 is adopted
With membrane wall vertical tube plates form, it is provided with intermediate mixing header, lower part high heat load area uses riffled tube, and top is compared with low-heat
Loading zone uses light pipe, and the benefit being arranged so is, on the one hand, the convex-concave surface in riffled tube can aggravate working medium and tube wall
Heat exchange, intraductal heat exchange area increase, and are conducive to augmentation of heat transfer, reduce wall temperature and thermal deviation, and can improve the varying duty of boiler
Adaptability；On the other hand, the relatively low thermic load area in top uses light pipe, can reduce drag losses and power consumption；Medium temperature overheats
Device 2 is preferably pendant superheater, receive in stove directly radiation and with high-temperature flue gas heat convection, reduce furnace outlet gas temperature.
Separator 3 in the present invention is preferably high-temperature heat insulation cyclone separator, and larger solid particle is captured, and returns to burner hearth cycle,
Part circulating ash enters external heat exchanger by ash control valve 12, and high temperature reheater 4 and low is disposed in external heat exchanger
Warm superheater 5, as shown, external heat exchanger is set in the feed back section of separator.3 top outlet of separator and back-end ductwork
Entrance is connected, and back-end ductwork is divided into the preceding flue and rear pass being mutually parallel by midfeather 13, wherein arrangement in preceding flue
There is low-temperature reheater 6, rear pass is interior to be disposed with high temperature superheater 7 and higher level's economizer 8 along flue gas circulating direction, downwards front and back cigarette
Road merges, and is from top to bottom subordinate's economizer 9 and air preheater 10.
Supercritical carbon dioxide electricity generation system includes high pressure turbine 17, level-one generator 18, low pressure turbine 19, two level power generation
Machine 20, high temperature regenerator 21, medium temperature regenerator 22, cryogenic regenerator 23, forecooler 24, precompactors 25, charge air cooler 26, main pressure
Contracting machine 27 and recompression machine 28.In electricity generation system, 22 high pressure side outlet of medium temperature regenerator is shunted, and a part is returned with high temperature
21 high pressure side inlet of hot device is connected, and another part is connected with 9 entrance of subordinate economizer, the outlet of subordinate's economizer 9 and higher level province coal
8 entrance of device be connected, higher level's economizer 8 outlet mixed with 21 high pressure side outlet working medium of high temperature regenerator after with 1 entrance phase of cooling wall
Even, the outlet of cooling wall 1 is connected with 5 entrance of low temperature superheater, and the outlet of low temperature superheater 5 is connected with 2 entrance of medium temperature overheater, medium temperature
The outlet of superheater 2 is connected with 7 entrance of high temperature superheater, and the outlet of high temperature superheater 7 is connected with 17 entrance of high pressure turbine, medium temperature backheat
The supercritical carbon dioxide working medium that 22 high pressure side outlet of device extracts 5~10% sequentially enters subordinate's economizer 9, higher level's economizer 8,
After being mixed with 21 high pressure side outlet working medium of high temperature regenerator, followed by cooling wall 1, low temperature superheater 5, medium temperature overheater 2
It absorbs heat with high temperature superheater 7, into 17 expansion work of high pressure turbine, level-one generator 18 is driven to generate electricity；High pressure turbine 17 exports
Be connected with 6 entrance of low-temperature reheater, low-temperature reheater 6 outlet is connected with 4 entrance of high temperature reheater, high temperature reheater 4 export and
19 entrance of low pressure turbine is connected, and working medium is swollen followed by low pressure turbine 19 is entered after 4 reheating of low-temperature reheater 6 and high temperature reheater
Swollen acting drives secondary generator 20 to generate electricity.
In the present invention, the upper and lower two stage arrangement of economizer to reduce the thermal deviation of high-temperature economizer, arrange by higher level's economizer 8
In 7 lower section of tail portion rear pass high temperature superheater, subordinate's economizer 9 is arranged in below the flue after merging.It at the same time, can be with
Setting spray carbon dioxide attemperator 11, extracts subordinate's economizer 9 between the outlet of medium temperature overheater 2 and 7 entrance of high temperature superheater
The low-temperature carbon dioxide working medium of entrance adjusts overheat temperature, changes the ash that the control of 12 aperture of ash control valve enters external bed heat
Measure proportion adjustment overheat temperature, reheating temperature and bed temperature.
The recirculating fluidized bed of the present invention takes fractional combustion mode, setting primary air fan 14, overfire air fan 15 and high-pressure blast
Machine 16.Wherein, three tunnels of First air point are preheated to 300 DEG C of heat primary air through air preheater 10 and provide burning fluidized wind and broadcast
Coal wind, the cold First air not preheated ensure that coal is uniformly sent into stove, prevent flue gas anti-channeling, ensure object as coal sealing air is given
Stream provides the part oxygen amount needed for burning；Overfire air fan 15 is preheated to 300 DEG C points three layers by close phase through air preheater 10
Forward and backward wall is respectively fed to above area, and the follow-up oxygen amount of aftercombustion reinforces turbulent closure scheme intensity, is realized fractional combustion, is effectively inhibited
Fuel type NOxGeneration；High pressure positive blower 16 is preheated to 300 DEG C through air preheater 10 and provides external bed heat and material returning device stream
Change wind and loosen wind, ensures normal Matter Transfer.
The present invention organically combines circulating fluidized bed combustion and supercritical carbon dioxide cycle, is made with supercritical carbon dioxide
For cycle fluid, including circulating fluidized bed boiler and supercritical carbon dioxide electricity generation system, wherein circulating fluidized bed boiler is super
Critical carbon dioxide electricity generation system provides heat source, and supercritical carbon dioxide electricity generation system utilizes the overcritical titanium dioxide of high temperature and pressure
Carbon working medium pushes the acting of high and low pressure turbine, drives electrical power generators, realizes high efficiency thermoelectric conversion.The present invention is directed to reduce super face
Boundary's carbon dioxide boiler cooling wall inlet temperature, reduction exhaust gas temperature, turbine exhaust pressure and compressor inlet pressure are only
Efficient, clean electric power generation is realized in vertical control, and generating efficiency improves, and unit tends to minimize, and has faster load responding speed
Degree, depth peak regulation is adaptable, is expected to break through the technical bottleneck of traditional fired power generating unit development, gives full play to coal resources advantage,
Energy utilization rate is improved, ensures energy security.
Embodiment 1
HT Superheater of CFB Boilers 7 exports 28Mpa, 600 DEG C of high temperature, High-pressure supercritical carbon dioxide working medium
Into 17 expansion work of high pressure turbine to 12.3Mpa, 493 DEG C, low-temperature reheater 6 is sequentially entered, high temperature reheater 4 reheats to
620 DEG C, enter 19 expansion work of low pressure turbine later to 5.35Mpa, 515 DEG C, 19 exiting exhaust gas of low pressure turbine sequentially enters height
21 low-pressure side of warm regenerator, 22 low-pressure side of medium temperature regenerator, the cooling of 23 low-pressure side of cryogenic regenerator, it is cold to enter forecooler 24 later
But to 32 DEG C, it is compressed to 7.65Mpa through precompactors 25,67 DEG C, about 41.7% working medium enters the compression of recompression machine 28
To 28.6Mpa, 188 DEG C, another part working medium enters charge air cooler 26 and is cooled to 32 DEG C, and 28.7Mpa is compressed to through main compressor 27,
79 DEG C, working medium is exported with recompression machine 28 after being heated into 23 high-pressure side of cryogenic regenerator and mixed, it is high into medium temperature regenerator 22
Side heating, the shunting of 22 high pressure side outlet of medium temperature regenerator, 92% working medium is pressed to enter the heating of high temperature regenerator 21,8% working medium
Subordinate's economizer 9 in recirculating fluidized bed, the heating of higher level's economizer 8 are sequentially entered, with the 21 high pressure side outlet logistics of high temperature regenerator
Mixing absorbs 350~500 DEG C of medium temperature fume afterheat using cryogenic fluid in cycle, reduces exhaust gas temperature, improves system effect
Rate, 474 DEG C of mixed working fluid sequentially enter cooling wall 1 in recirculating fluidized bed, low temperature superheater 5, pendant superheater 2 and high temperature mistake
Hot device 7 is heated to 600 DEG C, constitutes closed cycle.
In the present invention, precompactors 25, main compressor 27 and recompression machine 28 are straight by high pressure turbine 17 and low pressure turbine 19
Driving is connect, intermediate energy conversion loss is reduced, wherein high pressure turbine 17 drives precompactors 25 and main compressor 27, low pressure turbine
19 driving recompression machines 28, main compressor 27 and recompression 28 inlet pressure of machine and 19 pressure at expulsion of low pressure turbine are mutual indepedent,
It can easily be accommodated control.
In above-described embodiment 1, when supercritical carbon dioxide fluid properties are 600 DEG C/620 DEG C/28Mpa, generating efficiency can
Up to 46.9%.
With reference to above-described embodiment 1, embodiment 2~5 changes main gas temperature and pressure, reheat temperature and pressure, is optimized
The shunt ratio into recompression machine, and shunting 5~10% working medium enter the corresponding design cooling wall entrance of economizer
Temperature and generating efficiency refer to table 1.
1 embodiment 2~5 of table chooses the cooling wall inlet temperature and generating efficiency that different fluid properties are calculated
Claims (10)
1. a kind of fire coal circulating fluid bed boiler of supercritical carbon dioxide, including burner hearth, separator, back-end ductwork and positioned at separation
External heat exchanger in device feed back section, it is characterised in that：Cooling wall and medium temperature overheater are equipped in the burner hearth, it is described external
Equipped with high temperature reheater and the low temperature superheater being connected to respectively with cooling wall and medium temperature overheater, the tail portion cigarette in formula heat exchanger
Low-temperature reheater, high temperature superheater, higher level's economizer, subordinate's economizer and air preheater are equipped in road, wherein the high temperature
Superheater is connected to medium temperature overheater, and low-temperature reheater is connected to high temperature reheater；The working medium of the boiler is overcritical dioxy
Change carbon.
2. circulating fluidized bed boiler according to claim 1, it is characterised in that：The high temperature superheater exports Temperature of Working
It it is 560~700 DEG C, pressure is 25~35Mpa；High temperature reheater export Temperature of Working be 560 DEG C~700 DEG C, pressure be 12~
14Mpa；The cooling wall entrance Temperature of Working is 420 DEG C~540 DEG C.
3. circulating fluidized bed boiler according to claim 1, it is characterised in that：The back-end ductwork is separated by midfeather
For the preceding flue and rear pass being mutually parallel, wherein arrange that low-temperature reheater, rear pass are interior along flue gas circulating direction in preceding flue
It arranges after high temperature superheater and higher level's economizer, front and back flue merge and is respectively arranged subordinate's economizer and air preheat from top to bottom
Device.
4. circulating fluidized bed boiler according to claim 1, it is characterised in that：The medium temperature overheater outlet and high temperature mistake
Setting spray carbon dioxide attemperator between hot device entrance.
5. circulating fluidized bed boiler according to claim 1, it is characterised in that：The boiler uses classification air supply mode,
Equipped with primary air fan, overfire air fan and high pressure positive blower.
6. a kind of electricity generation system of the driving of the recirculating fluidized bed described in claim 1, it is characterised in that：Including high pressure turbine, low
Turbine is pressed, precompactors, main compressor and the level-one generator driven by high pressure turbine, the recompression machine driven by low pressure turbine
And secondary generator；Wherein, the entrance of the high pressure turbine is connect with high temperature superheater, and outlet is connect with low-temperature reheater, low
The entrance of pressure turbine is connect with high temperature reheater, and outlet is sequentially connected high temperature regenerator, medium temperature regenerator and cryogenic regenerator
Low pressure side inlet；The low side outlets of the cryogenic regenerator are connected by the entrance of forecooler and precompactors, precompactors
Outlet is divided into two branches, wherein a branch connects the high pressure side inlet of cryogenic regenerator by charge air cooler, main compressor, separately
One branch connects the low pressure side inlet of cryogenic regenerator high pressure side outlet and medium temperature regenerator by recompressing machine；The medium temperature
The high pressure side outlet of regenerator is divided into two branches, wherein a branch is connect with the high pressure side inlet of high temperature regenerator, it is another
Branch is sequentially connected subordinate's economizer and higher level's economizer, the high pressure side outlet of the outlet and high temperature regenerator of higher level's economizer
The cooling wall in burner hearth is connected after collecting.
7. a kind of electricity-generating method based on electricity generation system described in claim 6, it is characterised in that include the following steps：The medium temperature
The high pressure side outlet working medium of regenerator shunts, and a part enters the high-pressure side of high temperature regenerator, and another part sequentially enters boiler
Subordinate's economizer and higher level's economizer, higher level's economizer exit mixed with the working medium of high temperature regenerator high pressure side outlet after successively
It absorbs heat into cooling wall, low temperature superheater, medium temperature overheater and high temperature superheater, does work into high pressure turbine, drive precommpression
Machine and main compressor drive level-one electrical power generators, and high pressure turbine outlet working medium is again introduced into boiler, through low-temperature reheater and height
Enter low pressure turbine after warm reheater reheating to do work, drive recompression machine, drives secondary generator power generation；Low pressure turbine exports work
Matter sequentially enters the low-pressure side of high temperature regenerator, medium temperature regenerator and cryogenic regenerator, enters forecooler cooling after recycling heat,
Forecooler outlet working medium enters precompactors, and precompactors outlet working medium divides two-way, enters recompression machine all the way, and another way enters
Charge air cooler and main compressor, it is mixed with recompression machine outlet working medium after cryogenic regenerator high-pressure side is heated that main compressor exports working medium
It closes, is heated into medium temperature regenerator high-pressure side.
8. electricity-generating method according to claim 7, it is characterised in that：The 5 of the medium temperature regenerator high pressure side outlet working medium
~10% sequentially enters the subordinate's economizer and higher level's economizer of boiler.
9. electricity-generating method according to claim 7, it is characterised in that：The 35~45% of precompactors outlet working medium into
Enter recompression machine.
10. electricity-generating method according to claim 7, it is characterised in that：The generating efficiency is 40~50%.
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| CN108843418A (en) * | 2018-07-04 | 2018-11-20 | 西安热工研究院有限公司 | A kind of double pressure high efficiency burnt gas supercritical carbon dioxide association circulating power generation systems |
| CN109307256A (en) * | 2018-11-01 | 2019-02-05 | 哈尔滨锅炉厂有限责任公司 | Supercritical carbon dioxide boiler gas side temperature reducing system and desuperheating method |
| CN109611171A (en) * | 2019-01-15 | 2019-04-12 | 中国石油大学(华东) | Integral coal gasification-supercritical CO of zero carbon emission2Combined cycle generating process |
| CN109899780B (en) * | 2019-02-15 | 2020-03-17 | 清华大学 | Electric heating heat storage system of circulating fluidized bed boiler for cogeneration unit |
| CN112160806B (en) * | 2020-09-24 | 2022-04-22 | 西安交通大学 | Supercritical CO coupled with oxygen-enriched combustion2Circulating combined cooling heating and power system |
| CN115127378A (en) * | 2021-03-25 | 2022-09-30 | 清华大学 | Particle/supercritical carbon dioxide heat exchange experiment system and power generation experiment system |
| CN113587133A (en) * | 2021-08-11 | 2021-11-02 | 西安热工研究院有限公司 | Double-function boiler and method of coal-fired magnetofluid S-CO2 combined cycle power generation system |
| CN115234333A (en) * | 2022-06-24 | 2022-10-25 | 哈尔滨锅炉厂有限责任公司 | Thermal power generation system with double working medium circulation of supercritical carbon dioxide and steam |
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