CN107906498B - 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 PDFInfo
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- CN107906498B CN107906498B CN201711010865.6A CN201711010865A CN107906498B CN 107906498 B CN107906498 B CN 107906498B CN 201711010865 A CN201711010865 A CN 201711010865A CN 107906498 B CN107906498 B CN 107906498B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B3/00—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass
- F22B3/08—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass at critical or supercritical pressure values
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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
- F01K7/00—Steam 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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/32—Steam 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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/0007—Modifications 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G7/00—Steam superheaters characterised by location, arrangement, or disposition
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Thermal Sciences (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The present invention discloses a kind of supercritical carbon dioxide circulating fluidized bed combustion coal boiler, the working medium using supercritical carbon dioxide instead of steam in existing circulating fluidized bed boiler as heat absorption acting, and working medium endothermic process includes primary shunting and single reheat.Supercritical carbon dioxide circulating fluidized bed boiler working medium heating surface includes the carbon dioxide cold wall screen formula heater and high temperature reheater being arranged in burner hearth；Separator outlet arranges external higher level's economizer using ash as heat source in material returning device section to burner hearth parallel；It along flow of flue gas direction heating surface include low-temperature reheater and junior's economizer in back-end ductwork.The invention also discloses the electricity generation systems of supercritical carbon dioxide circulating fluidized bed combustion coal boiler driving power generation.Supercritical carbon dioxide circulating fluidized bed combustion coal boiler of the invention enhances the flue gas heat transfer of reheater high temperature section, while also alleviating back-end ductwork heat demand pressure, can be effectively reduced discharge amount, the exhaust gas temperature of pollutant, increases boiler efficiency.
Description
Technical field
The invention belongs to thermal power generation apparatus fields, and in particular to a kind of supercritical carbon dioxide circulating fluidized bed combustion coal pot
Furnace and its electricity generation system of driving.
Background technique
It improves 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 converted using steam as cycle fluid, and steam parameter is increased to 700 DEG C, and efficiency could reach
To 50% or so.However, the alloy material difficulty that exploitation at present is able to bear 700 DEG C of high temperature is big, it is at high cost, therefore material is resistance to
The high temperatures big bottleneck for becoming limitation power plant's efficiency power generation.
Supercritical carbon dioxide is one of supercritical fluid, and temperature and pressure heats more than critical point, is cold
But gas phase is still kept after, is not undergone phase transition.It is to follow with supercritical carbon dioxide in the identical situation of turbine entrance Temperature of Working
The boiler system generating efficiency of ring working medium is higher than using steam as the boiler system generating efficiency of cycle fluid.Supercritical carbon dioxide
Coal-fired thermal power generation can reach in 620 DEG C of temperature ranges and be heated to 700 DEG C of efficiency using steam as working medium, not need 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, overcritical dioxy is concentrated mainly on for the research of supercritical carbon dioxide about domestic and foreign scholars
Change application of the carbon in solar energy, nuclear power and fossil energy power field, and is directed to 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, however coal dust
Boiler blow-off amount is larger, and the 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 rapidly developed in recent decades, and the combination of supercritical carbon dioxide will undoubtedly become
A kind of trend.
Summary of the invention
It is an object of the present invention to provide a kind of thermals efficiency that can be improved boiler, while reducing pollutant emission, realize 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 efficiency and limits larger problem.
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, junior'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 furnace
Thorax outlet ash content flow direction set gradually, low-temperature reheater, junior'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 also being 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, when load down, supercritical carbon dioxide gas tank inner part working medium flows into gasholder station；Supercritical carbon dioxide cold wall entrance with
The outlet of high temperature regenerator is connected.
It is provided only with supercritical carbon dioxide cold wall, screen formula heater in burner hearth and shields formula high temperature reheater, overcritical two
Carbonoxide cold wall shields formula heater and screen formula reheater is suspended from burner hearth front-back wall respectively and is staggered cloth along the adherent arrangement of four wall of burner hearth
It sets, screen formula heater is made of in parallel and the identical first screen formula heater of dimensional structure 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 set to 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 shielding height of the 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 using ash as heat source；High-temperature heat insulation cyclone separator includes 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.Second high temperature as a result,
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 negative into furnace heat and boiler
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 tail portion horizontal transition flue is not set
Heating surface is set, only arranges heating surface in vertical flue, it is empty to flow to air preheater heating after the outflow of junior's economizer for flue gas
Gas can ensure that fuel stablizes burning, tail portion three-level heating surface in supercritical carbon dioxide boiler hearth of circulating fluidized bed
Arrangement is substantially reduced 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 for spending 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 width direction7=0.7~0.85D3, preferably H7=0.77D3；Low-temperature reheater edge
A height of H of back-end ductwork extending direction8=0.76~0.93D3, 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, it is controlled by ash control valve high in external higher level's economizer surface
Warm ash content heats the supercritical carbon dioxide from junior's economizer, the external wide H of higher level's economizer surface5=1.08~
1.3H7, preferably H5=1.2H7, the external high H of higher level's economizer surface6=0.54~0.66H8, preferably H6=0.6H8。
Junior's economizer is staggered in arrangement, that is, including the multiple rows of transversely arranged comb group set gradually from top to bottom, each
Comb group includes multiple row comb disposed in parallel, and each column comb includes n (n is more than or equal to 1 integer) 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,
An and comb columns column, comb between adjacent comb group more than comb columns in even rows comb group in odd row comb group
It is staggered in arrangement.This arrangement makes junior's economizer coefficient of heat transfer big, and size reduces.The high H of junior's economizer9For H9=
0.99~1.21D3, preferably H9=1.1D3；Heating surface high H of the air preheater along back-end ductwork extending direction10For H10=
1.6~1.91D3, preferably H10=1.74D3；Wherein D3For flue width.In junior'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 is comb diameter.
The present invention also provides a kind of supercritical carbon dioxide electricity generation systems, 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 working principle of the invention is: boiler cold wall working medium source includes high temperature regenerator and cryogenic regenerator.From low temperature
The primary shunting working medium that stream is taken out in regenerator cold side successively passes through junior's economizer, the heating of external higher level's economizer, until not shunting
After working medium is identical as the final temperature of working medium heated in high temperature regenerator, 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, the outlet of supercritical carbon dioxide gas tank and screen formula calorifier inlets phase
Even.Gas tank is first all flowed into after working medium heats in burner hearth internal cold wall, the inflow screen formula together that mixes 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 function 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 heating, until doing work into low pressure turbine heat release, so far work after temperature is identical as screen formula heater sender property outlet temperature
Matter is completed once in boiler interior suction thermal cycle.
Compared with the prior art, the beneficial effect comprise that
1, circulating fluidized bed boiler of the invention using supercritical carbon dioxide as working medium, is compared by 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 supercritical carbon dioxide is selected to exist as cycle fluid
Under the conditions of identical acting, caloric receptivity is few in working medium furnace, 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, 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
Reduce greatly turbine, supercritical carbon dioxide to pump etc. in devices because of maintenance cost caused by cavitation.Circulating fluidized bed boiler skill
Art is the high-efficiency low-pollution cleaning coal combustion technology rapidly developed in recent decades, and that establishes on the basis of recirculating fluidized bed is overcritical
Carbon dioxide recycle fluidized-bed combustion boiler, the combination compared to the biggish coal-powder boiler of blowdown flow rate and supercritical carbon dioxide undoubtedly have more
Standby clear superiority.
2, furnace inner screen type heater is divided into the first and second screen formula heaters, and structure is full symmetric about screen formula reheater,
And be both staggeredly arranged in furnace with screen formula reheater, furnace 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.
3, 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 compared to high temperature reheater and higher level's economizer, and the coefficient of heat transfer between heat source and working medium obtains
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, thus the situation that arrange heating surface can not.
Detailed description of the invention
Fig. 1 (a) is the overall structure diagram of supercritical carbon dioxide circulating fluidized bed boiler；Fig. 1 (b) is that junior saves coal
The main view of device；Fig. 1 (c) is the comb enlarged left view part of junior's economizer；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.
Label in attached drawing includes 1 --- supercritical carbon dioxide gas tank, 2 --- and gasholder station, 3 --- overcritical dioxy
Change carbon cold wall, 4 --- furnace inner screen type heater, 4-a --- outside screen formula heater, 4-b --- inside screen formula heater,
5 --- screen formula high temperature reheater, 6 --- high-temperature heat insulation cyclone separator 6-a --- outside separators, 6-b --- inside separation
Device, 7 --- ash content control valve, 8 --- external higher level's economizer, 9 --- low-temperature reheater, 10 --- junior'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, I --- cryogenic regenerator outlet
Lack of gas flow into cryogenic regenerator as cycle fluid after cooling compression, J --- cool air inlet, K --- First air, L ---
Secondary Air.
Specific 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, furnace
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, junior's economizer 10 and air preheater 11.Gasholder station 2, supercritical carbon dioxide cold wall 3, furnace inner screen type heater
4 with 1 connection of supercritical carbon dioxide gas tank.Wherein, gasholder station 2 and the two-way connection of supercritical carbon dioxide gas tank 1, working medium exist
Between gasholder station 2 and supercritical carbon dioxide gas tank 1 flow direction depend on boiler operating load, when load rise when, working medium by
Gasholder station 2 flows to supercritical carbon dioxide gas tank 1, and when load decline, 1 inner part working medium of supercritical carbon dioxide gas tank is flowed into
Gasholder station 2.The outlet of cold wall 3 is connected with 1 entrance of supercritical carbon dioxide gas tank, screen 4 entrance of 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 flows into screen formula heater 4 via gas tank further to be heated.Cold reheat
The outlet of device 9 is connected with screen 5 entrance of formula high temperature reheater, and the outlet of junior'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 furnace
Thorax outlet ash content flow direction is set gradually.Screen formula heater 4 outlet and 9 entrance of low-temperature reheater respectively with 12 phase of high pressure turbine
Even, the outlet of screen formula high temperature reheater 5 is connected with low pressure turbine 13.It is as a result, separation with high pressure turbine 12, it 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 furnace.First heating workshop section includes along Working fluid flow side
To (junior's economizer 10, external higher level's economizer 8) the supercritical carbon dioxide cold wall 3, supercritical carbon dioxide being sequentially connected
Gas tank 1 and screen formula heater 4, the second heating workshop section includes the low-temperature reheater 9 being sequentially connected along Working fluid flow direction and screen formula
High temperature reheater 5.
Burner hearth internal heating surface only arranges that cold wall 3, screen formula heater 4 and screen formula reheater 5, cold wall 3 are 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 size, structure are consistent.
The material returning device section between the outlet of high-temperature heat insulation cyclone separator 6 and burner hearth is arranged in external higher level's economizer 8；High temperature
Adiabatic Cyclone separator 6 includes according to the screen symmetrically arranged first high-temperature heat insulation cyclone separator 6-a of formula high temperature reheater 5 and the
Two high-temperature heat insulation cyclone separator 6-b, the first lower part high-temperature heat insulation cyclone separator 6-a are provided with external heating surface, and described
Two lower parts high-temperature heat insulation cyclone separator 6-b do not arrange heating surface.
As shown in Fig. 1 (b) and Fig. 1 (c), junior's economizer 10 is multiple rows of transversely arranged including setting gradually from top to bottom
Comb group, each comb group include multiple row comb disposed 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 comb columns column more than comb columns in even rows comb group in comb group, the comb stagger arrangement cloth between adjacent comb group
It sets.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 number are 13.Screen
A length of H of the formula high temperature reheater 5 in inner of the boiler chamber thorax width direction4=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, the single pipe range of low-temperature reheater 9 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
The high H (high along the heating surface of back-end ductwork extending direction) in hot face10=13.5m, junior's economizer 10 heating surface 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 junior's 10 intraductal working medium flow velocitys of economizer, outside
Set 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 first in cryogenic regenerator 16,
Part working medium is then tapped off and enters junior's economizer 10, it is weary that remaining working medium continues absorption low pressure turbine 13 in high temperature regenerator 15
Gas heat.Working medium is shunted after 10 interior suction receiving portions tail flue gas heat of junior's economizer, flows into external higher level's economizer 8.Ash content
Control valve 7 controls the high temperature ash quantity that the first high-temperature heat insulation cyclone separator 6-a enters external higher level's economizer 8, and high temperature ash is into one
Step heating, which shunts working medium, makes its temperature reach the temperature that remaining working medium leaves high temperature regenerator 15, and 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, enter the adherent arrangement of burner hearth together in burner hearth emulsion zone bottom
Cold wall 3.Then, working medium flows into supercritical carbon dioxide gas tank 1, if boiler load up at this time, 2 inner part of gasholder station by cold wall 3
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, screen
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 flow out low temperature backheat
Device recompresses to obtain cycle fluid through supercooling, again flows into cryogenic regenerator 16, and participation recycles 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 the form of First air from burner hearth bottom air distribution plate and Secondary Air form from emulsion zone top respectively
In burner hearth, make the burning of burner hearth fuel efficient stable.The high-temperature flue gas that burning generates first gives burner hearth internal cold wall 3, the heating of screen formula
Device 4, screen formula reheater 5 transmit heat, then flow to back-end ductwork successively to low-temperature reheater 9, junior'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.
Supercritical carbon dioxide circulating fluidized bed combustion coal boiler efficiency of the invention is greater than 93%.
Claims (8)
1. a kind of supercritical carbon dioxide circulating fluidized bed combustion coal boiler, which is characterized 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), junior's economizer (10) and air preheat
Device (11)；The membrane type supercritical carbon dioxide cold wall (3), screen formula heater (4) and screen formula high temperature reheater (5) are arranged in furnace
In thorax, separator (6), ash content control valve (7) and external higher level's economizer (8) are successively set along furnace outlet ash content flow direction
It sets, low-temperature reheater (9), junior's economizer (10) and air preheater (11) are successively set on tail portion cigarette along flow of flue gas direction
In road；
The gasholder station (2) and the two-way connection of the supercritical carbon dioxide gas tank (1), the membrane type supercritical carbon dioxide are cold
Wall (3) entrance exports connection with the outlet of external higher level's economizer (8) and high temperature regenerator (15) respectively；
Membrane type supercritical carbon dioxide cold wall (3), screen formula heater (4) and screen formula high temperature reheater (5) are provided only in burner hearth,
The membrane type supercritical carbon dioxide cold wall (3) is along the adherent arrangement of four wall of burner hearth, and the screen formula heater (4) and screen formula high temperature are again
Hot device (5) is suspended from burner hearth front-back wall respectively and is staggeredly arranged, and the screen formula heater (4) is by the first screen formula heater (4- in parallel
A) it is formed with the second screen formula heater (4-b).
2. supercritical carbon dioxide circulating fluidized bed combustion coal boiler according to claim 1, which is characterized in that emulsion zone bottom
The wide D in portion2=0.55~0.65D1；It is set to 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-b) are located at burner hearth middle and upper part；Height of the screen formula high temperature reheater (5) in burner hearth
Degree is H3=0.5~0.6H2, a length of H4=0.9~1.1H1；D1Indicate furnace width.
3. supercritical carbon dioxide circulating fluidized bed combustion coal boiler according to claim 1, which is characterized in that the separation
Device (6) is high-temperature heat insulation cyclone separator, and external higher level's economizer (8) setting is between separator (6) outlet and burner hearth
Material returning device section；The high-temperature heat insulation cyclone separator includes 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
The lower part (6-a) is provided with external heating surface, and the second high-temperature heat insulation cyclone separator (6-b) lower part does not arrange heating surface.
4. supercritical carbon dioxide circulating fluidized bed combustion coal boiler according to claim 1, which is characterized in that back-end ductwork
In, the not set heating surface of tail portion horizontal transition flue, 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 direction；Air preheater (11) outlet and burner hearth bottom
Air distribution plate and emulsion zone top are connected.
5. supercritical carbon dioxide circulating fluidized bed combustion coal boiler according to claim 1, which is characterized in that the low temperature
Reheater (9) is H in the pipe range of back-end ductwork width direction7=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) be located at the first high-temperature heat insulation cyclone separator lower part and with return
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；D3Indicate back-end ductwork width.
6. supercritical carbon dioxide circulating fluidized bed combustion coal boiler according to claim 1, which is characterized in that junior saves coal
Comb in device is staggered in arrangement；The a height of H of junior'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；D3Indicate back-end ductwork width.
7. supercritical carbon dioxide circulating fluidized bed combustion coal boiler according to claim 1, which is characterized in that the junior
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 connection, the low-temperature reheater (9) and shield formula high temperature reheater (5) edge
Successively connection, screen formula heater (4) outlet and the low-temperature reheater (9) entrance are saturating with high pressure respectively in Working fluid flow direction
Flat (12) are connected, and screen formula high temperature reheater (5) outlet is connected with low pressure turbine (13).
8. a kind of supercritical carbon dioxide electricity generation system, which is characterized in that the supercritical carbon dioxide electricity generation system includes right
It is required that supercritical carbon dioxide circulating fluidized bed combustion coal boiler described in any one of 1~7, and by the supercritical carbon dioxide
The driving power generation of circulating fluidized bed combustion coal boiler.
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| CN108662577B (en) * | 2018-04-26 | 2019-07-05 | 华北电力大学 | A kind of pressurized fluidised-bed boiler S-CO2Cycle generating system and method |
| CN108844051B (en) * | 2018-09-11 | 2023-07-25 | 哈尔滨锅炉厂有限责任公司 | Supercritical CO 2 Test boiler for working medium |
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| CN105526576B (en) * | 2016-01-20 | 2017-11-17 | 西安热工研究院有限公司 | A kind of coal base supercritical carbon dioxide Brayton cycle double split flow efficient power generation system |
| CN106195983B (en) * | 2016-06-30 | 2019-01-04 | 西安热工研究院有限公司 | Coal-fired supercritical carbon dioxide Brayton cycle electricity generation system |
| CN106090865B (en) * | 2016-08-10 | 2018-06-22 | 华能国际电力股份有限公司 | A kind of supercritical carbon dioxide Boiler radiation heated surface arrangement method |
| CN206016879U (en) * | 2016-09-14 | 2017-03-15 | 西安热工研究院有限公司 | Coal base carbon dioxide and water association circulating power generation system |
| CN107131016B (en) * | 2017-04-19 | 2020-01-07 | 华北电力大学 | Supercritical CO2Coal-fired thermal power generation system combined with organic Rankine cycle |
| CN107091128B (en) * | 2017-04-19 | 2020-01-03 | 华北电力大学 | Supercritical water and supercritical CO2Combined double-circulation coal-fired thermal power generation system |
| CN107101187B (en) * | 2017-06-26 | 2023-04-18 | 山东大学 | Heating system and heating method for supercritical carbon dioxide boiler |
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