CN107906498A - Supercritical carbon dioxide circulating fluidized bed combustion coal boiler and its electricity generation system of driving - Google Patents

Supercritical carbon dioxide circulating fluidized bed combustion coal boiler and its electricity generation system of driving Download PDF

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Publication number
CN107906498A
CN107906498A CN201711010865.6A CN201711010865A CN107906498A CN 107906498 A CN107906498 A CN 107906498A CN 201711010865 A CN201711010865 A CN 201711010865A CN 107906498 A CN107906498 A CN 107906498A
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carbon dioxide
supercritical carbon
temperature
screen formula
fluidized bed
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CN201711010865.6A
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CN107906498B (en
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李平姣
钟文琪
邵应娟
陈晓乐
展锦程
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Southeast University
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Southeast University
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B3/00Other methods of steam generation; Steam boilers not provided for in other groups of this subclass
    • F22B3/08Other methods of steam generation; Steam boilers not provided for in other groups of this subclass at critical or supercritical pressure values
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10Adaptations for driving, or combinations with, electric generators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/32Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B31/00Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
    • F22B31/0007Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B31/00Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
    • F22B31/08Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22GSUPERHEATING OF STEAM
    • F22G7/00Steam superheaters characterised by location, arrangement, or disposition

Abstract

The present invention discloses a kind of supercritical carbon dioxide circulating fluidized bed combustion coal boiler, replaces working medium of the steam as heat absorption acting in existing circulating fluidized bed boiler using supercritical carbon dioxide, working medium endothermic process includes once shunting and single reheat.Supercritical carbon dioxide circulating fluidized bed boiler working medium heating surface includes carbon dioxide cold wall screen formula heater and the high temperature reheater being arranged in burner hearth;Separator outlet arranges external higher level's economizer using ash as heat source parallel to burner hearth in material returning device section;Include low-temperature reheater and subordinate's economizer along flow of flue gas direction heating surface in back-end ductwork.The invention also discloses the electricity generation system of supercritical carbon dioxide circulating fluidized bed combustion coal boiler driving power generation.The supercritical carbon dioxide circulating fluidized bed combustion coal boiler of the present invention enhances the flue gas heat transfer of reheater high temperature section, while also alleviates back-end ductwork heat demand pressure, can effectively reduce discharge capacity, the exhaust gas temperature of pollutant, increase boiler efficiency.

Description

Supercritical carbon dioxide circulating fluidized bed combustion coal boiler and its electricity generation system of driving
Technical field
The invention belongs to thermal power generation apparatus field, and in particular to a kind of supercritical carbon dioxide circulating fluidized bed combustion coal pot Stove and its electricity generation system of driving.
Background technology
Improve energy transition rate, reduce pollutant emission, the exploitation novel environment friendly energy is the eternal master of thermal power industry Topic.Conventional boiler system realizes that energy is changed using steam as cycle fluid, and steam parameter brings up to 700 DEG C, and efficiency could reach To 50% or so.However, the alloy material difficulty that exploitation at present can bear 700 DEG C of high temperature is big, it is of high cost, therefore material is resistance to The high temperatures big bottleneck for becoming limitation power plant efficiency power generation.
Supercritical carbon dioxide is one kind in supercritical fluid, its temperature and pressure heats more than critical point, is cold But gas phase is still kept after, is not undergone phase transition.In the case where turbine entrance Temperature of Working is identical, using supercritical carbon dioxide to follow The steam generator system generating efficiency of ring working medium is higher than the steam generator system generating efficiency using steam as cycle fluid.Supercritical carbon dioxide Coal-fired thermal power generation, can be reached in 620 DEG C of temperature ranges and 700 DEG C of efficiency is heated to using steam as working medium, it is not necessary to again High-temperature alloy is developed, and supercritical carbon dioxide energy density is big, heat transfer efficiency is high, and coal consumption is low, supercritical carbon dioxide Coal-fired thermal power generation has extremely wide application prospect.
In the latest 20 years, it is concentrated mainly on overcritical dioxy on research of the domestic and foreign scholars for supercritical carbon dioxide Change application of the carbon in solar energy, nuclear power and fossil energy power field, and for the overcritical titanium dioxide of high parameter thermoelectricity The research of carbon coal-burning boiler is less.Supercritical carbon dioxide is used in pulverized-coal fired boiler by patent 201510117556.3, but coal dust Boiler blow-off amount is larger, its pollutant process faced is big in society, economic aspect pressure.Technology of Circulating Fluidized Bed Boiler conduct The high-efficiency low-pollution cleaning coal combustion technology developed rapidly in recent decades, and the combination of supercritical carbon dioxide will undoubtedly become A kind of trend.
The content of the invention
The thermal efficiency of boiler can be improved it is an object of the present invention to provide a kind of, while reduces pollutant emission, realizes boiler The circulating fluidized bed combustion coal boiler using supercritical carbon dioxide as cycle fluid of high-efficiency cleaning operation, to solve existing steam Boiler steam temperature improves the problem of limitation is larger to efficiency.
Technical solution:The present invention provides a kind of supercritical carbon dioxide circulating fluidized bed combustion coal boiler, including overcritical two Carbonoxide gas tank, gasholder station, membrane type supercritical carbon dioxide cold wall, screen formula heater, screen formula high temperature reheater, separator, ash Divide control valve, external higher level's economizer, low-temperature reheater, subordinate's economizer and air preheater;Membrane type supercritical carbon dioxide Cold wall, screen formula heater and screen formula reheater are arranged in burner hearth, and separator, ash content control valve and external higher level's economizer are along stove Thorax outlet ash content flow direction is set gradually, low-temperature reheater, subordinate's economizer and air preheater along flow of flue gas direction according to It is secondary to be arranged in back-end ductwork.
High temperature reheater is arranged in burner hearth with shielding formula, enhances the flue gas heat transfer of reheater high temperature section, while is also alleviated Back-end ductwork heat demand pressure.
Gasholder station and supercritical carbon dioxide gas tank diconnected, working medium gasholder station and supercritical carbon dioxide gas tank it Between flow direction depend on boiler operatiopn load, when boiler load up, working medium flows to supercritical carbon dioxide by gasholder station Gas tank, during load down, supercritical carbon dioxide gas tank inside points working medium flows into gasholder station;Supercritical carbon dioxide cold wall entrance with The outlet of high temperature regenerator is connected.
Supercritical carbon dioxide cold wall, screen formula heater are provided only with burner hearth and shields formula high temperature reheater, overcritical two Along the adherent arrangement of four wall of burner hearth, screen formula heater and screen formula reheater are suspended from burner hearth front-back wall and stagger cloth carbonoxide cold wall respectively Put, screen formula heater is made of the first screen formula heater in parallel and that dimensional structure is identical and the second screen formula heater.
The wide D of burner hearth1;The wide D in emulsion zone bottom2=0.55~0.65D1, it is arranged at a height of L of cold wall of burner hearth front wall1, rear wall The a height of L of cold wall1+L2, wherein L2=0.063~0.078L1;First screen formula heater and second screen formula heater edge in burner hearth The height of burner hearth length extending direction is H2=0.22~0.27L1, in the long H of furnace chamber width1=0.37~0.45H2, and First screen formula heater and the second screen formula heater are located at burner hearth middle and upper part, and height of the screen formula high temperature reheater in burner hearth is H3 =0.5~0.6H2, long H4=0.9~1.1H1
Separator is high-temperature heat insulation cyclone separator, and external higher level's economizer is arranged between separator outlet and burner hearth Material returning device section, makes external higher level's economizer be used as heat source using ash;High-temperature heat insulation cyclone separator is included according to screen formula high temperature reheating The symmetrically arranged first high-temperature heat insulation cyclone separator of device and the second high-temperature heat insulation cyclone separator, the first high-temperature heat insulation whirlwind point Device lower part is provided with external heating surface, the second high-temperature heat insulation cyclone separator lower part does not arrange heating surface.Thus, the second high temperature The ash temperature that Adiabatic Cyclone separator is segregated into burner hearth does not change substantially, belongs to high temperature section ash, since ash follows in the present invention Ring multiplying power is higher, therefore the second high-temperature heat insulation cyclone separator can be used for assisting the separation of the first high-temperature heat insulation cyclone separator, return Circulating ash, and when changing load occurs for boiler, control enters the high temperature section ash quantity in burner hearth, makes to bear with boiler into stove heat Lotus is adapted.
In back-end ductwork, because working medium specific volume is small and temperature rise is small, then working medium caloric receptivity is small, therefore afterbody horizontal transition flue is not set Heating surface is put, only arranges heating surface in vertical flue, it is empty to flow to air preheater heating after subordinate's economizer outflow for flue gas Gas, can ensure that fuel is stablized in supercritical carbon dioxide boiler hearth of circulating fluidized bed and burn, afterbody three-level heating surface Arrangement is obvious to reduce exhaust gas temperature, and boiler thermal efficiency improves.
The wide D of back-end ductwork3;Low-temperature reheater comb uses coiled pipe arrangement, and low-temperature reheater is wide in back-end ductwork The pipe range in degree direction is less than flue width,;Air preheater outlet is connected with burner hearth bottom air distribution plate and emulsion zone top.Low temperature Reheater is H in the pipe range of back-end ductwork width7=0.7~0.85D3, it is preferably H7=0.77D3;Low-temperature reheater edge A height of H of back-end ductwork extending direction8=0.76~0.93D3, it is preferably H8=0.85D3;External higher level's economizer is placed in first High-temperature heat insulation cyclone separator lower part, it is arranged side by side with material returning device, controlled by ash control valve high in external higher level's economizer surface Warm ash content, heats the supercritical carbon dioxide from subordinate's economizer, the external wide H of higher level's economizer surface5=1.08~ 1.3H7, it is preferably H5=1.2H7, the external high H of higher level's economizer surface6=0.54~0.66H8, it is preferably H6=0.6H8
Subordinate's economizer is staggered in arrangement, i.e. including the multiple rows of transversely arranged comb group set gradually from top to bottom, each Comb group includes the multiple row comb being arranged in parallel, and each column comb includes n (n is the integer more than or equal to 1) a vertically disposed row Pipe.Comb columns difference is identical in odd row comb group from top to bottom, and comb columns difference is identical in even rows comb group, And comb columns row more than comb columns in even rows comb group, the comb between adjacent comb group in odd row comb group It is staggered in arrangement.This arrangement make it that subordinate's economizer coefficient of heat transfer is big, and size reduces.The high H of subordinate's economizer9For H9= 0.99~1.21D3, it is preferably H9=1.1D3;The high H of heating surface of air preheater along back-end ductwork extending direction10For H10= 1.6~1.91D3, it is preferably H10=1.74D3;Wherein D3For flue width.In subordinate's economizer, between the comb of each comb group Horizontal spacing S1=1.8d, the longitudinal pitch S between adjacent comb group2=2d, wherein d are comb diameter.
The present invention also provides a kind of supercritical carbon dioxide electricity generation system, and the supercritical carbon dioxide electricity generation system is by above-mentioned The driving power generation of supercritical carbon dioxide circulating fluidized bed combustion coal boiler.
The present invention operation principle be:Boiler cold wall working medium source includes high temperature regenerator and cryogenic regenerator.From low temperature The once shunting working medium that regenerator cold side takes out stream is successively heated by subordinate's economizer, external higher level's economizer, until not shunting After the final temperature of working medium of the working medium with being heated in high temperature regenerator is identical, one is mixed with high temperature regenerator cold side outlet port working medium Cocurrent flow enters supercritical carbon dioxide cold wall.Working medium mixing after high temperature regenerator and the heat absorption of higher level's economizer flows into boiler cold wall, Cold wall outlet is connected with supercritical carbon dioxide gas tank import, and the outlet of supercritical carbon dioxide gas tank is with shielding formula calorifier inlets phase Even.Working medium first all flows into gas tank after being heated in burner hearth internal cold wall, and the together inflow screen formula that mixed with working medium in gas tank adds Hot device, flows into high pressure turbine heat release acting after being heated to 600 DEG C.Supercritical carbon dioxide finishes work(discharge in high pressure turbine, Low-temperature reheater reheating in into back-end ductwork, working medium enter high temperature screen formula in burner hearth after low-temperature reheater completes preliminary heating Reheater heats, until after temperature is identical with screen formula heater sender property outlet temperature, does work into low pressure turbine heat release, so far work Matter completes circulation of once absorbing heat in boiler.
Compared with the prior art, beneficial effects of the present invention include:
1st, circulating fluidized bed boiler of the invention is compared using supercritical carbon dioxide as working medium, supercritical carbon dioxide In traditional working-medium water, specific volume is small under identical Temperature-pressure Conditions, and burner hearth import supercritical carbon dioxide enters cryogenic regenerator and high temperature After regenerator heating, for temperature up to 525 DEG C or so, initial temperature is high, therefore selects supercritical carbon dioxide to exist as cycle fluid Under the conditions of identical acting, caloric receptivity is few in working medium stove, and electricity generation system cycle efficieny is high.The energy density of supercritical carbon dioxide Greatly, the turbine of the electricity generation system outfit belonging to it, compressor size also accordingly reduce, and metal consumable quantity is small, initial economic input It is small.In addition, supercritical carbon dioxide will not undergo phase transition process in cyclic process, the generation of cavitation is prevented from source, greatly Big turbine, the supercritical carbon dioxide of reducing is to the maintenance cost caused by cavitation in the devices such as pump.Circulating fluidized bed boiler skill Art is that the high-efficiency low-pollution developed rapidly in recent decades cleans coal combustion technology, and that is established on the basis of recirculating fluidized bed is overcritical Carbon dioxide recycle fluidized-bed combustion boiler, the combination of the coal-powder boiler larger compared to blowdown flow rate and supercritical carbon dioxide undoubtedly have more Standby clear superiority.
2nd, stove inner screen type heater is divided into the first and second screen formula heaters, and structure is full symmetric on screen formula reheater, And both of which is staggeredly arranged in stove with screen formula reheater, stove can be fully absorbed by being conducive to screen formula heater and screen formula reheater Interior smoke convection radiant heat, promotes burner hearth horizontal cross-section thermic load to be uniformly distributed.
3rd, high temperature screen formula reheater is placed in burner hearth, and external higher level's economizer utilizes high temperature ash heating tube in cyclone separator Interior working medium, is arranged at back-end ductwork, the coefficient of heat transfer between heat source and working medium is obtained compared to high temperature reheater and higher level's economizer To greatly enhancing, heat exchanger heating surface area can accordingly reduce, and can effectively solve the problem that Large-scale machine set back-end ductwork because of working medium stream It is more to measure excessive caused longitudinal direction tube bank, so that the situation that heating surface can not arrange.
Brief description of the drawings
Fig. 1 (a) is the overall structure diagram of supercritical carbon dioxide circulating fluidized bed boiler;Fig. 1 (b) is that subordinate saves coal The front view of device;Fig. 1 (c) is that the comb enlarged left view of subordinate's economizer is local;Fig. 1 (d) is supercritical carbon dioxide circulation The overall structure top view illustration that fluidized-bed combustion boiler portions under heat face simplifies;
Fig. 2 is burner hearth of the present invention and main heating surface scale diagrams;
Fig. 3 includes the Brayton cycle electricity generation system schematic diagram of supercritical carbon dioxide circulating fluidized bed boiler.
Mark in attached drawing includes, and 1 --- supercritical carbon dioxide gas tank, 2 --- gasholder station, 3 --- overcritical dioxy Change carbon cold wall, 4 --- stove inner screen type heater, 4-a --- outside screen formula heater, 4-b --- inner side screen formula heater, 5 --- screen formula high temperature reheater, 6 --- high-temperature heat insulation cyclone separator 6-a --- outside separators, 6-b --- inner side separate Device, 7 --- ash content control valve, 8 --- external higher level's economizer, 9 --- low-temperature reheater, 10 --- subordinate's economizer, 11 --- air preheater, 12 --- high pressure turbine, 13 --- low pressure turbine, 14 --- generator, 15 --- high temperature regenerator, 16 --- cryogenic regenerator;A --- reheater exports working medium, B --- screen formula heater outlet working medium, C --- the external province of higher level Coal device exports working medium, D --- and high temperature regenerator exports working medium, E --- and high pressure turbine exports working medium, and F --- cryogenic regenerator goes out Mouth working medium, G --- low pressure turbine lack of gas, H --- lack of gas flow out after cryogenic regenerator heat release, and I --- cryogenic regenerator exports Lack of gas through cooling compress after as cycle fluid flow into cryogenic regenerator, J --- cool air inlet, K --- First air, L --- Secondary Air.
Embodiment
Referring to Fig. 1 (a), supercritical carbon dioxide circulating fluidized bed combustion coal boiler includes supercritical carbon dioxide gas tank 1, storage Adherent membrane type supercritical carbon dioxide cold wall 3, screen formula heater 4, screen formula high temperature reheater 5, high-temperature heat insulation rotation in gas station 2, stove The low temperature being sequentially arranged in wind separator 6, ash content control valve 7, external higher level's economizer 8, back-end ductwork along flow of flue gas direction Reheater 9, subordinate's economizer 10 and air preheater 11.Gasholder station 2, supercritical carbon dioxide cold wall 3, stove inner screen type heater 4 with 1 unicom of supercritical carbon dioxide gas tank.Wherein, gasholder station 2 and 1 two-way unicom of supercritical carbon dioxide gas tank, working medium exist Between gasholder station 2 and supercritical carbon dioxide gas tank 1 flow direction depending on boiler operating load, when load rises, working medium by Gasholder station 2 flows to supercritical carbon dioxide gas tank 1, and when load declines, 1 inside points working medium of supercritical carbon dioxide gas tank flows into Gasholder station 2.The outlet of cold wall 3 is connected with 1 entrance of supercritical carbon dioxide gas tank, 4 entrance of screen formula heater and overcritical titanium dioxide The outlet of carbon gas tank 1 is connected, and the outlet heating working medium of cold wall 3 is flowed into screen formula heater 4 via gas tank further to be heated.Cold reheat Device 9 is exported to be connected with screen 5 entrance of formula high temperature reheater, and the outlet of subordinate's economizer 10 is connected with external 8 entrance of higher level's economizer.
The outlet of air preheater 11 is connected with burner hearth bottom air distribution plate and emulsion zone top;Supercritical carbon dioxide cold wall 3, Screen formula heater 4 and screen formula reheater 5 are arranged in burner hearth, and separator 6, ash content control valve 7 and external higher level's economizer 8 are along stove Thorax outlet ash content flow direction is set gradually.Screen formula heater 4 export and 9 entrance of low-temperature reheater respectively with 12 phase of high pressure turbine Even, 5 outlet of screen formula high temperature reheater is connected with low pressure turbine 13.Thus, it is separation with high pressure turbine 12, can be by working medium in pot The heated approach of flowing is divided into the first heating workshop section and the second heating workshop section in stove.First heating workshop section is included along Working fluid flow side To be sequentially connected (subordinate's economizer 10, external higher level's economizer 8) supercritical carbon dioxide cold wall 3, supercritical carbon dioxide Gas tank 1 and screen formula heater 4, the second heating workshop section include low-temperature reheater 9 and the screen formula being sequentially connected along Working fluid flow direction High temperature reheater 5.
Burner hearth internal heating surface only arranges cold wall 3, screen formula heater 4 and screen formula reheater 5, and cold wall 3 is adherent along four wall of burner hearth Arrangement, screen formula heater 4 and screen formula reheater 5 are staggeredly arranged respectively at burner hearth front-back wall.As shown in Fig. 1 (d), shield formula heater 4 are made of the first screen formula heater 4-a and the second screen formula heater 4-b in parallel, the first screen formula heater 4-a and the second screen formula Heater 4-b sizes, structure are consistent.
External higher level's economizer 8 is arranged on high-temperature heat insulation cyclone separator 6 and exports material returning device section between burner hearth;High temperature Adiabatic Cyclone separator 6 is included according to the symmetrically arranged first high-temperature heat insulation cyclone separator 6-a of screen formula high temperature reheater 5 and the Two high-temperature heat insulation cyclone separator 6-b, the first high-temperature heat insulation cyclone separator 6-a lower parts are provided with external heating surface, and described Two high-temperature heat insulation cyclone separator 6-b lower parts do not arrange heating surface.
As shown in Fig. 1 (b) and Fig. 1 (c), subordinate's economizer 10 includes setting gradually from top to bottom multiple rows of transversely arranged Comb group, each comb group include the multiple row comb that is arranged in parallel, and each column comb includes 4 vertically disposed combs, on to Comb columns difference is identical in lower odd row comb group, and comb columns difference is identical in even rows comb group, and odd number Arrange in comb group comb columns and one arranged than comb columns in even rows comb group more than, the comb stagger arrangement cloth between adjacent comb group Put.Single cell outside diameter d is 42mm, horizontal spacing S between tube bank1For 75.6mm, S2Longitudinal pitch is 84mm.
As shown in Fig. 2, the wide D of burner hearth1=11.9m, the wide D in emulsion zone bottom2=7.1m.3 vertical direction height L of front wall cold wall1 For 39.6m, rear wall height L1+L2For 42.4m.First screen formula heater 4-a and second screen formula heater 4-b Gao Jun in burner hearth For H2=9.8m, length are H1=4m, and the first screen formula heater 4-a and the second screen formula heater 4-b screen the piece numbers are 13.Screen A length of H of the formula high temperature reheater 5 in inner of the boiler chamber thorax width4=4m, a height of H in furnace height direction3=5.5m, and 5 screen the piece number of screen formula high temperature reheater is 49.The wide D of back-end ductwork3=7.8m, 9 single pipe range of low-temperature reheater are (wide in back-end ductwork Spend the pipe range in direction) H7=5.9m, heating surface height (along the height of back-end ductwork extending direction) H8=6.6m, air preheater 11 by High (high along the heating surface of the back-end ductwork extending direction) H in hot face10=13.5m, 10 heating surface of subordinate's economizer height is (along back-end ductwork The heating surface of extending direction is high) H9=8.5m, external higher level's economizer 8 is equal with subordinate 10 intraductal working medium flow velocitys of economizer, outside Put the wide H of 8 heating surface of higher level's economizer5=9.36m, high H6=5.1m.
Cyclic process such as Fig. 3 institute of the supercritical carbon dioxide circulating fluidized bed boiler working medium in Brayton cycle electricity generation system Show.Cycle fluid (supercritical carbon dioxide) absorbs the heat from 13 lack of gas of low pressure turbine in cryogenic regenerator 16 first, Part working medium is then tapped off and enters subordinate's economizer 10, it is weary that remaining working medium continues absorption low pressure turbine 13 in high temperature regenerator 15 Gas heat.Shunt working medium and after absorption part tail flue gas heat, flow into external higher level's economizer 8 in subordinate's economizer 10.Ash content Control valve 7 controls the first high-temperature heat insulation cyclone separator 6-a to enter the high temperature ash quantity of external higher level's economizer 8, and high temperature ash is into one Step heating shunting working medium makes its temperature reach the temperature that remaining working medium leaves high temperature regenerator 15, about 525 DEG C.From high temperature backheat After the mixing of two bursts of working medium of device 15 and external higher level's economizer 8, in burner hearth emulsion zone bottom together into the adherent arrangement of burner hearth Cold wall 3.Then, working medium flows into supercritical carbon dioxide gas tank 1 by cold wall 3, if boiler load up at this time, 2 inside points of gasholder station Working medium also flows into supercritical carbon dioxide gas tank 1.In gas tank 1 after mixing, working medium, which flows into, enters screen formula heater 4, shields After working medium is heated to 600 DEG C by formula heater 4, working medium is transported to acting in high pressure turbine 12.
For working medium from after the discharge of high pressure turbine 12, temperature is about 545 DEG C, carries out single reheat, thermal process includes again for this, follows Ring working medium first absorbs tail flue gas heat in low-temperature reheater 9, absorbs heat subsequently into screen formula high temperature reheater 5.When working medium is being shielded When being heated to consistent with screen 4 outlet temperature of formula heater in formula reheater 5, working medium is transported to acting in low pressure turbine 13, becomes Dynamic generator 14 generates electricity.
Low pressure turbine 13 exports lack of gas followed by high temperature regenerator 15 and cryogenic regenerator 16, as work in reheater tubes The heat source of matter releases heat, can reduce the supply of boiler fired coal heat, increase electricity generation system efficiency.Then lack of gas outflow low temperature backheat Device recompresses to obtain cycle fluid through supercooling, again flows into cryogenic regenerator 16, and participation circulates next time, repeats above-mentioned working medium Cyclic process.
Into the hot-air of burner hearth, heated in back-end ductwork final stage heating surface air preheater by 20 DEG C of heat absorptions under room temperature To 350 DEG C or so, then flowed into respectively in the form of First air from burner hearth bottom air distribution plate and Secondary Air form from emulsion zone top In burner hearth, make the burning of burner hearth fuel efficient stable.The high-temperature flue gas produced burn first to burner hearth internal cold wall 3, screen formula heating Device 4, screen formula reheater 5 transmit heat, then flow to back-end ductwork successively to low-temperature reheater 9, subordinate's economizer 10 and air Preheater 11 conveys heat.From after the outflow of air preheater 11, temperature is significantly reduced flue gas, and smoke evacuation loss is small.
The supercritical carbon dioxide circulating fluidized bed combustion coal boiler efficiency of the present invention is more than 93%.

Claims (10)

1. a kind of supercritical carbon dioxide circulating fluidized bed combustion coal boiler, it is characterised in that including supercritical carbon dioxide gas tank (1), gasholder station (2), membrane type supercritical carbon dioxide cold wall (3), screen formula heater (4), screen formula high temperature reheater (5), separation Device (6), ash content control valve (7), external higher level's economizer (8), low-temperature reheater (9), subordinate's economizer (10) and air preheat Device (11);The membrane type supercritical carbon dioxide cold wall (3), screen formula heater (4) and screen formula reheater (5) are arranged on burner hearth Interior, separator (6), ash content control valve (7) and external higher level's economizer (8) are set gradually along furnace outlet ash content flow direction, Low-temperature reheater (9), subordinate's economizer (10) and air preheater (11) are successively set on back-end ductwork along flow of flue gas direction In.
2. supercritical carbon dioxide circulating fluidized bed combustion coal boiler according to claim 1, it is characterised in that the gas storage Stand (2) and the two-way unicom of the supercritical carbon dioxide gas tank (1), supercritical carbon dioxide cold wall (3) entrance respectively with External higher level's economizer (8) outlet and high temperature regenerator (15) outlet unicom.
3. supercritical carbon dioxide circulating fluidized bed combustion coal boiler according to claim 1, it is characterised in that in burner hearth only It is provided with supercritical carbon dioxide cold wall (3), screen formula heater (4) and screen formula high temperature reheater (5), the overcritical titanium dioxide Carbon cold wall (3) is suspended from burner hearth respectively along the adherent arrangement of four wall of burner hearth, the screen formula heater (4) and screen formula high temperature reheater (5) Front-back wall is staggeredly arranged, and the screen formula heater (4) is by the first screen formula heater (4-a) and the second screen formula heater in parallel (4-b) is formed.
4. supercritical carbon dioxide circulating fluidized bed combustion coal boiler according to claim 1, it is characterised in that emulsion zone bottom The wide D in portion2=0.55~0.65D1;It is arranged at a height of L of cold wall of burner hearth front wall1, the rear a height of L of wall cold wall1+L2, L2=0.063~ 0.078L1;The first screen formula heater (4-a) and the second screen formula heater (4-b) are in burner hearth along burner hearth length extension side To height be H2=0.22~0.27L1, it is H in the length of furnace chamber width1=0.37~0.45H2, and the first screen formula Heater (4-a) and the second screen formula heater (4-a) are located at burner hearth middle and upper part;Height of the screen formula high temperature reheater (5) in burner hearth Spend for H3=0.5~0.6H2, a length of H4=0.9~1.1H1;D1Represent furnace width.
5. supercritical carbon dioxide circulating fluidized bed combustion coal boiler according to claim 1, it is characterised in that the separation Device (6) is high-temperature heat insulation cyclone separator, and external higher level's economizer (8) is arranged between separator (6) outlet and burner hearth Material returning device section;The high-temperature heat insulation cyclone separator is included according to screen formula high temperature reheater (5) symmetrically arranged first high temperature Adiabatic Cyclone separator (6-a) and the second high-temperature heat insulation cyclone separator (6-b), the first high-temperature heat insulation cyclone separator (6-a) lower part is provided with external heating surface, and the second high-temperature heat insulation cyclone separator (6-b) lower part does not arrange heating surface.
6. supercritical carbon dioxide circulating fluidized bed combustion coal boiler according to claim 1, it is characterised in that back-end ductwork In, afterbody horizontal transition flue is not provided with heating surface, and low-temperature reheater (9) comb is coiled pipe, the low-temperature reheater (9) it is less than back-end ductwork width in the pipe range of back-end ductwork width;Air preheater (11) outlet and burner hearth bottom Air distribution plate and emulsion zone top are connected.
7. supercritical carbon dioxide circulating fluidized bed combustion coal boiler according to claim 7, it is characterised in that the low temperature Reheater (9) is H in the pipe range of back-end ductwork width7=0.7~0.85D3, low-temperature reheater is along back-end ductwork extension side To a height of H8=0.76~0.93D3;External higher level's economizer (8) is located at the first high-temperature heat insulation cyclone separator lower part and with returning Glassware is arranged side by side, the external wide H of higher level's economizer surface5=1.08~1.3H7, the external high H of higher level's economizer surface6=0.54 ~0.66H8;D3Represent back-end ductwork width.
8. supercritical carbon dioxide circulating fluidized bed combustion coal boiler according to claim 1, it is characterised in that subordinate saves coal Comb in device is staggered in arrangement;The a height of H of subordinate's economizer9=0.99~1.21D3;Air preheater is along back-end ductwork extending direction The a height of H of heating surface10=1.6~1.91D3;D3Represent back-end ductwork width.
9. supercritical carbon dioxide circulating fluidized bed combustion coal boiler according to claim 1, it is characterised in that the subordinate Economizer (10), external higher level's economizer (8), membrane type supercritical carbon dioxide cold wall (3), supercritical carbon dioxide gas tank (1) With screen formula heater (4) along Working fluid flow direction successively unicom, the low-temperature reheater (9) and shield formula high temperature reheater (5) edge Unicom, screen formula heater (4) outlet and the low-temperature reheater (9) entrance are saturating with high pressure respectively successively in Working fluid flow direction Flat (12) are connected, and screen formula high temperature reheater (5) outlet is connected with low pressure turbine (13).
10. a kind of supercritical carbon dioxide electricity generation system, it is characterised in that the supercritical carbon dioxide electricity generation system includes right It is required that the supercritical carbon dioxide circulating fluidized bed combustion coal boiler in 1~9 described in any one, and by the supercritical carbon dioxide The driving power generation of circulating fluidized bed combustion coal boiler.
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