CN106838891B - Recirculating fluidized bed oxygen-enriched combustion boiler system - Google Patents
Recirculating fluidized bed oxygen-enriched combustion boiler system Download PDFInfo
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- CN106838891B CN106838891B CN201710030431.6A CN201710030431A CN106838891B CN 106838891 B CN106838891 B CN 106838891B CN 201710030431 A CN201710030431 A CN 201710030431A CN 106838891 B CN106838891 B CN 106838891B
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- flue gas
- burner hearth
- combustion chamber
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- wind
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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
- F23C10/10—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 the separation apparatus being located outside the combustion chamber
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
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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
- F23C2206/00—Fluidised bed combustion
- F23C2206/10—Circulating fluidised bed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
- F23L7/007—Supplying oxygen or oxygen-enriched air
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
A kind of recirculating fluidized bed oxygen-enriched combustion boiler system, including burner hearth, cyclone separator, external combustion chamber, back-end ductwork and wind-supply unit, wherein the outlet of the burner hearth is connected to the cyclone separator, for exporting the flue gas containing recycle stock from burner hearth；After the cyclone separator separates the flue gas containing recycle stock, recycle stock is exported from its underpart enters the external combustion chamber, and flue gas partial enters back-end ductwork from the upper outlet of cyclone separator；The external combustion chamber inputs the recycle stock by cyclone separator and inputs external combustion chamber fluidized wind by wind-supply unit, and external combustor exit is connected to the arrival end of the burner hearth.System of the invention uses burns under entrance high oxygen concentration, greatly reduces boiler body and subsidiary engine volume, can reduce boiler initial cost and operation cost, reduces the occupied area of boiler island.
Description
Technical field
The present invention relates to combustion apparatus, in particular to a kind of recirculating fluidized bed oxygen-enriched combustion boiler system.
Background technique
The greenhouse gases CO that a large amount of combustion of fossil fuel generate2Serious shadow is caused to global climate environment
It rings.Power station industry occupies an important position in fossil fuel, and based on coal fired power plant, account for the 40% of power station industry with
On.Therefore, a kind of suitable coal fired power plant CO need to be found2The technical solution of trapping.In existing CO2In trapping technique, oxygen-enriched combusting
Technology (also referred to as O2/CO2Flue gas recirculation combustion technology) be can large-scale industrial application coal-fired CO2One of trapping technique.The skill
Art pure oxygen and circulating flue gas enter boiler combustion instead of air as oxidant, CO in flue gas after burning2Concentration (butt) can
Up to 90% or more, liquid CO is obtained convenient for cooling compression2, while removing or recycling other pollutants.
In recent years, the research of oxygen-enriched combustion technology has all been carried out in many countries and regions in succession, and it is more effective to achieve
Progress, and have accumulated many valuable scientific research data.But existing oxygen-enriched combustion technology is only by the nitrogen in air
It has changed into containing high concentration CO2Tail flue gas, volume share shared by oxygen changes smaller (21%~27%), so relative to normal
For advising air burning unit, the foundation of investment of boiler body (burner hearth and back-end surfaces) is constant, but due to increasing sky
Gas separation oxygen generation system and flue gas recirculation system, the investment of boiler island and operating cost will increase considerably, to can make complete
Factory's business efficiency decline about 8%~12% or so, this is beyond affordability for each coal fired power plant, and is also to restrict now
There is the main reason for oxygen-enriched combustion technology large-scale commercial application.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of recirculating fluidized bed oxygen-enriched combustion boiler system, with overcome with
Upper at least one described technical problem.
The present invention provides a kind of recirculating fluidized bed oxygen-enriched combustion boiler system, comprising: burner hearth, cyclone separator, external combustion
Room, back-end ductwork and wind-supply unit are burnt, wherein
The outlet of the burner hearth is connected to the cyclone separator, for exporting the flue gas containing recycle stock from burner hearth；Institute
After stating the cyclone separator separation flue gas containing recycle stock, recycle stock is exported from its underpart enters the external burning
Room, flue gas partial enter back-end ductwork from the upper outlet of cyclone separator；The external combustion chamber is inputted by cyclone separator
The recycle stock and external combustion chamber fluidized wind is inputted by wind-supply unit, external combustor exit is connected to entering for the burner hearth
Mouth end.
Further, the external combustor exit is connected to the arrival end of the burner hearth by a material returning device.
Further, the material returning device is the U-shaped material returning device with fin panel casing.
Further, the external combustion chamber is bubbling fluidization bed combustor.
Further, the two of wind-supply unit First air and 30-70% that also input oxygen concentration is 30-50% respectively
Secondary wind to the burner hearth different height.
Further, it is 60- that the wind-supply unit, which is input to the combustion chamber fluidized wind oxygen concentration of external combustion chamber,
100%.
Further, the burner hearth further includes lime stone adding mouth, carries out desulfurization to add lime stone into burner hearth.
Further, system further includes flue gas recycled unit, and the back-end ductwork includes back-end surfaces, recycling cigarette
Air preheater, deduster, air-introduced machine and CO2Recyclable device, by the cyclone separator upper outlet enter flue gas successively into
Enter heating surface, is exported after recycled smoke-gas preheater heat exchange through deduster, a part enters CO after air-introduced machine2Recycling dress
It sets, another part enters flue gas recycled unit as flue gas recycled.
Further, the flue gas recycled unit includes flue gas recycled condenser and recirculation blower, into following again
The flue gas of ring flue gas unit is delivered to the recycling preheating by described after flue gas recycled condenser and recirculation blower
Device is delivered to burner hearth and external combustion chamber as part material after exchanging heat.
Further, the wind-supply unit include external combustor mixer, First air mixer, Secondary Air mixer and
Making oxygen by air separation device, the air after the heat exchange that the flue gas of making oxygen by air separation device output is exported with flue gas recycled unit input respectively
External combustor mixer, First air mixer and Secondary Air mixer are mixed, the external combustor mixer output
External combustion chamber fluidized wind is to external combustion chamber；The First air mixer and Secondary Air mixer export First air and two respectively
Secondary wind is to the burner hearth.Through the above technical solutions, would know that the beneficial effect of system of the invention is:
(1) this circulating fluidized bed boiler systems is using burning under entrance high oxygen concentration, greatly reduces boiler body and auxiliary
Body product, so as to substantially reduce boiler initial cost and operation cost, while reducing the occupied area of boiler island；
(2) this system controls the temperature for returning to burner hearth fly ash granule using the U-shaped material returning device with fin panel casing, is used for
Solve the problems, such as that improving rear hearth temperature in burner hearth oxygen concentration is difficult to control；
(3) part of fuel is added in external combustion chamber and is burnt, increase the heat exchange amount of combustion system, it can also basis
It needs to adjust external burning Indoor Combustion amount, reaches adjustment heat exchange amount to meet recirculating fluidized bed burner hearth caloric receptivity and require, can have
Effect solves recirculating fluidized bed burner hearth size under high oxygen concentration and becomes smaller, and burner hearth internal heating surface recepts the caloric few problem；
(4) compared with regular circulation fluidized bed external heat exchanger, the external combustion chamber in this system is a bubbling fluidization
Bed combustor, height of the heating surface heat transfer coefficient compared with burner hearth internal heating surface；
(5) this system can be by optimizing flue gas recycled condenser heating surface, so that a small amount of vapor
Into in furnace, achieve the effect that be humidified in furnace, improves limestone desulfurization efficiency in furnace, it is possible to realize that tail portion is not required to specially set
Oxysulfide SO can be met by setting desulfurizerXEmission request；
(6) air distribution and oxygen classification can be realized along furnace height direction, the discharge of gas pollutant NOx can be effectively reduced,
Reach part and saves circulating fluidized bed boiler tail portion denitration cost.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the recirculating fluidized bed oxygen-enriched combustion boiler system embodiment of the embodiment of the present invention.
Figure label: 1- burner hearth；2- cyclone separator；The external combustion chamber 3-；4- material returning device；5- central tube；
6- back-end surfaces；7- flue gas recycled preheater；8- deduster；9- air-introduced machine；10-CO2Recyclable device；
11- flue gas recycled condenser；12- recirculation blower；
13- making oxygen by air separation device；14- First air mixer；15- Secondary Air mixer；The external combustor mixer of 16-；
The external combustion chamber 17- is to fuel-device；18- burner hearth is to fuel-device；19- burner hearth slag cooler；20- pressure balance
Pipe；21- lime stone batcher；22- pendant superheater
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in further detail.Illustrate that appended attached drawing simplified and used as illustrating herein.Shown in attached drawing
Component count, shape and size can modify according to actual conditions, and the configuration of component is likely more complexity.The present invention
In can also carry out otherwise practice or application, and without departing from spirit and scope defined in the present invention under conditions of, can be into
Row various change and adjustment.
Basic conception according to the present invention is the defect for overcoming existing oxygen-enriched combustion technology economy poor, proposes that one kind is followed
Ring fluidized bed oxygen-enriched combustion boiler system, not only high combustion efficiency, exhaust gas volumn is small, and rear gas leakage is small, can easily return
Receive the CO in flue gas2, and boiler volume is smaller, can effectively reduce boiler initial cost and operating cost, to significantly improve combustion
The economy of coal oxygen-enriched combustion boiler system.
A kind of example structure of recirculating fluidized bed oxygen-enriched combustion boiler system (for example, recirculating fluidized bed high oxygen of the present invention
The oxygen-enriched combustion boiler system of concentration) as shown in Figure 1.Recirculating fluidized bed oxygen-enriched combustion boiler system can be by burner hearth 1, whirlwind point
It is pre- from device 2, external combustion chamber 3, material returning device 4, coal feeder 5, charging limestone device 6, back-end surfaces 7, flue gas recycled
Hot device 8, deduster 9, air-introduced machine 10, CO2Recyclable device 11, flue gas recycled condenser 12, recirculation blower 13, mixer
14, making oxygen by air separation device 15 and external combustor mixer 16 form, wherein back-end surfaces 7, flue gas recycled preheater
8, deduster 9, air-introduced machine 10 and CO2Recyclable device 11 is used as back-end ductwork；Flue gas recycled condenser 12 and recirculation blower
13 are used as flue gas recycled unit；External combustor mixer, First air mixer, Secondary Air mixer and making oxygen by air separation device
15 are used as wind-supply unit.
1 top exit of recirculating fluidized bed burner hearth (corresponding dilute-phase zone) is connected with cyclone separator 2,2 bottom of cyclone separator
Outlet is connected by standpipe with external 3 top opening of combustion chamber.The external outlet of combustion chamber 3 passes through pipeline and 4 import phase of material returning device
Even, the outlet of material returning device 4 is connected by pipeline with 1 bottom of recirculating fluidized bed burner hearth (corresponding emulsion zone).1 bottom of recirculating fluidized bed burner hearth
Portion is connect with slag cooler 19.It is pushed up in 1 emulsion zone of recirculating fluidized bed burner hearth and 2 outlet at bottom of cyclone separator and external combustion chamber 3
Charging gear 17 and 18 is respectively set in connection standpipe between portion's opening.4 top of 20 one end of pressure-equalizing pipe and external combustion chamber
It is connected, the other end is connected with 1 dilute-phase zone of recirculating fluidized bed burner hearth.
2 upper outlet of cyclone separator is connected by central tube 5 with back-end surfaces 6, back-end surfaces 6 and recycling cigarette
Air preheater 7 is arranged in circulating fluidized bed boiler back-end ductwork, and flue gas recycled preheater 7 passes through pipeline and 8 phase of deduster
Even.What is come out from 2 top of cyclone separator first passes through 6 heat release of back-end surfaces cooling containing fine ash (recycle stock) flue gas, then passes through
It crosses flue gas recycled preheater 7 and flue-gas temperature is reduced to (150 DEG C -180 DEG C) after dedusting temperature, finally enter in deduster 8
Dedusting.
After deduster 8 pipeline all the way with air-introduced machine 9 and CO2Recyclable device 10 is sequentially connected, another way and flue gas recycled
Condenser 11, recirculation blower 12, flue gas recycled preheater 7 pass sequentially through pipeline and are connected.Go out from flue gas recycled preheater 7
Come pipeline all the way with making oxygen by air separation device 13 and First air mixer 14, Secondary Air mixer 15 and external combustor mixer
16 are connected, and another way is connected with 4 bottom plenum of material returning device.First air mixer 14, Secondary Air mixer 15 and external combustion chamber
Mixer 16 by pipeline respectively with 1 emulsion zone air compartment of recirculating fluidized bed burner hearth, 1 dilute-phase zone of recirculating fluidized bed burner hearth and external combustion
4 air compartment of room is burnt to be connected.Flue gas a part after dedusting enters as flue gas recycled by flue gas recycled preheater 7 to be followed again
Ring blower, another part flue gas enter CO by air-introduced machine2Recyclable device 10.
The high-concentration oxygen and the recycling cigarette after the preheating of flue gas recycled preheater 7 that making oxygen by air separation device 13 obtains
Gas mixes in First air mixer 14, Secondary Air mixer 15 and external combustor mixer 16, when as fuel combustion
Oxidant, First air mixer 14 and Secondary Air mixer 15 are respectively that recirculating fluidized bed burner hearth 1 provides primary and secondary air (once
Wind oxygen concentration is 30%~50%；Secondary Air oxygen concentration is 30%~70%), external combustor mixer 16 is external combustion
It burns room and fluidized wind (oxygen concentration is 60%~100%) is provided.Fuel and primary and secondary air in charging gear 18 is ciculation fluidized
It burns in pool furnace thorax 1, the bulky grain clinker generated in combustion process is discharged by slag cooler 19, and the ash-laden gas of generation is in whirlwind point
From gas solid separation is realized in device 2, the solid separated enters external combustion chamber 3 by 2 lower part outlet standpipe of cyclone separator,
The fuel in charging gear 17 also enters external combustion chamber 3 by the opening on standpipe simultaneously.External 3 air compartment of combustion chamber is to external
The high oxygen concentration fluidized wind that combustion chamber 3 provides, so that in the solid that the fuel and cyclone separator 2 that newly feed separate
Combustible full combustion in external combustion chamber 3, the solid particle after burning enter material returning device 4, warp from the outlet of external combustion chamber 3
1 emulsion zone of recirculating fluidized bed burner hearth is returned to after material returning device 4 is cooling, gas enters recirculating fluidized bed burner hearth by pressure-equalizing pipe 20
1, the burnout degree as furnace fuel.
Flue gas main component after the separation of cyclone separator 2 is CO2And vapor, tail portion is upwardly into from central tube 3
Heating surface 6, after back-end surfaces 6 and flue gas recycled preheater 7 cool down, into being dusted in deduster 8.After dedusting
Flue gas contain high concentration CO2It is divided into two-way: all the way through air-introduced machine 9 in CO2It is recycled in recyclable device 10, another way is used as and follows again
Under the action of recirculation blower 12, cool down ring flue gas water removal first in flue gas recycled condenser 11, then by following again
Ring blower 12 and the boosting heating of flue gas recycled preheater 7, last major part flue gas recycled respectively enter First air mixer
14, in Secondary Air mixer 15 and external combustor mixer 16, the high-concentration oxygen obtained with making oxygen by air separation device 13 is carried out
Mixing, there are also sub-fraction flue gas recycleds directly to make a gift to someone 4 air compartment of material returning device as fluidized wind.
Pressure-equalizing pipe 20 not only acts as fluidized wind in the external combustion chamber 3 of guidance and enters recirculating fluidized bed burner hearth 1 as combustion
Wind to the greatest extent also has the function of the external combustion chamber 3 of distribution and 4 operting differential pressure of material returning device, therefore pressure-equalizing pipe 20 is passed through recycle stream
Change 1 specific location of pool furnace thorax to need by calculating meticulously.
By calculation shows that: referring to shown in Fig. 1, pressure-equalizing pipe 20 is in the best access point (c of recirculating fluidized bed burner hearth 1
Point) near the pressure difference Along ent that cyclone separator 2 exports between (a point) and return port (b point), as selectable range:
ΔPbcAccount for Δ PabRatio between 40%~60%.
In actual moving process, external combustion chamber 3 and returning charge can also be adjusted by adjusting system neutral point position
The relations of distribution of 4 pressure difference of device.Volume fraction into oxygen in total gas of boiler 1 is 45%~50%, oxygen purity
After raising, compared with existing oxygen-enriched combustion technology, under identical fuel quantity, 1 bulk volume of boiler (burner hearth and tail portion cigarette
Road) it is about the 1/2 of existing oxygen-enriched combustion technology, boiler body initial cost will substantially reduce；Exhaust gas volumn will be greatly lowered, then follow
Loop system initial cost also will substantially reduce, and air-introduced machine and recirculation blower operating cost will also be reduced.
Wherein, boiler furnace 1 is made of fin panel casing, and is overheated along short transverse in front side setting screen formula on top
Device 22.1 fuel quantity of burner hearth accounts for the 60%~70% of the total fuel quantity of boiler, and fluidising air velocity is 4m/s~6m/s, circulating ratio 20.
1 fluidized wind of burner hearth is made of pure oxygen and flue gas recycled, and the volume fraction of oxygen is 30%~50%, and air quantity accounts for total blast volume
60%~70%, it is divided into primary and secondary air in the height direction and is sent into burner hearth, the ratio between air quantity is 6: 4, and crossing oxygen quotient is 1.2.Pot
The control of furnace exhaust temperature is at 120 DEG C~130 DEG C, and burner hearth caloric receptivity accounts for boiler always inputs heat 20%~23%, back-end ductwork
Caloric receptivity accounts for boiler always inputs heat 28%~30%, and material returning device caloric receptivity accounts for boiler always inputs heat 20%~23%,
External combustion chamber caloric receptivity accounts for boiler always inputs heat 24%~32%.
Further, external combustion chamber 3 uses film-type water-cooling structure, and internal arrangement water cooling pipe laying, fuel quantity account for pot
The 30%~40% of the total fuel quantity of furnace, fluidized wind is made of pure oxygen and flue gas recycled, and wind speed is generally 0.3m/s~0.5m/s,
The volume fraction of oxygen is 60%~100%, and air quantity accounts for the 30%~40% of total blast volume, and crossing oxygen quotient is 1.2.It is generated after burning
Flue gas by top pressure balanced draft pipe introduce burner hearth dilute-phase zone, used as tertiary air.The external combustion chamber
Practical to control for bubbling bed combustor, bed temperature and inlet and outlet circulating ash temperature at 750 DEG C~900 DEG C, cross-sectional area is burner hearth
1.2~1.5 times, highly 1/4~1/3 for burner hearth.High temperature superheater heating surface is arranged in external combustion chamber 3.
Further, material returning device 4 uses film-type water-cooling structure, and fluidized wind is flue gas recycled, and wind speed is generally 0.3m/s
~0.5m/s.Described 750 DEG C~900 DEG C of 4 import circulating ash temperature of material returning device, 300 DEG C~400 DEG C of circulating ash temperature are exported, is made
With the external combustion chamber for being equivalent to regular circulation fluidized-bed combustion boiler, for controlling burner hearth bed temperature, while main circulation loop is had concurrently
Portions under heat face and dust sender function.Evaporating heating surface is arranged in material returning device 4.
Further, lime stone adding mouth, such as arrangement lime stone batcher 21 are arranged on 4 feed back leg of material returning device, are used
The mode that lime stone is added into furnace carries out desulfurization.In order to improve limestone utilization and desulfuration efficiency in burner hearth 1,1 temperature of burner hearth
Degree control is conducive to the agstone under oxygen-enriched combusting mode and is sintered into calcium oxide, with sulfur dioxide knot at 920 DEG C~930 DEG C
Conjunction reaches desulfurization effect, and also by optimizing to flue gas recycled condenser heating surface, so that First air and two
Flue gas recycled in secondary wind contains a certain amount of vapor, into burner hearth in after can reach the effect of humidification desulfurization.Using furnace
After interior limestone desulfurization, it can significantly simplify tail portion desulphurization system, achieve the purpose that save the cost
This boiler system divides three-level to carry out air distribution along recirculating fluidized bed burner hearth short transverse, wherein being sent into one by burner hearth bottom
Secondary wind, group are divided into oxygen and flue gas recycled, are sent into Secondary Air by the changeover portion of burner hearth emulsion zone and dilute-phase zone, group is divided into oxygen
And flue gas recycled, burnout degree is sent by burner hearth dilute-phase zone pressure balance ventilation duct, group is divided into external gas fume of combustion chamber.Air distribution point
Being divided into three regions along furnace height direction after grade is specially reducing zone-combustion zone-burning-out zone, can effectively be dropped after fractional combustion
The generation of low gas pollutant NOx.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in protection of the invention
Within the scope of.
Claims (9)
1. a kind of recirculating fluidized bed oxygen-enriched combustion boiler system, characterized by comprising: burner hearth, cyclone separator, external burning
Room, back-end ductwork and wind-supply unit, wherein
A) outlet of the burner hearth is connected to the cyclone separator, for exporting the flue gas containing recycle stock from burner hearth；
B) after the cyclone separator separates the flue gas containing recycle stock, recycle stock enters described outer from its underpart outlet
Combustion chamber is set, flue gas partial enters back-end ductwork from the upper outlet of cyclone separator；
C) the external combustion chamber is inputted the recycle stock and is inputted external combustion chamber by wind-supply unit and flowed by cyclone separator
Change wind, external combustor exit is connected to the arrival end of the burner hearth；
D) charging gear is respectively set in the burner hearth and the external combustion chamber, is added by the charging gear to the burner hearth
Fuel quantity account for the 60%~70% of the total fuel quantity of boiler；The fuel being added by the charging gear to the external combustion chamber
Amount accounts for the 30%~40% of the total fuel quantity of boiler；
E) the fluidized wind oxygen concentration that the wind-supply unit is provided to external combustion chamber is 60%~100%.
2. system according to claim 1, which is characterized in that the external combustor exit is connected to by a material returning device
The arrival end of the burner hearth.
3. system according to claim 2, which is characterized in that the material returning device is the U-shaped material returning device with fin panel casing.
4. system according to claim 1, which is characterized in that the external combustion chamber is bubbling fluidization bed combustor.
5. system according to claim 1, which is characterized in that also input oxygen concentration is 30- to the wind-supply unit respectively
The Secondary Air of 50% First air and 30-70% to the burner hearth different height.
6. system according to claim 1, which is characterized in that the burner hearth further includes lime stone adding mouth, with to burner hearth
Interior addition lime stone carries out desulfurization.
7. system according to claim 1, which is characterized in that it further include flue gas recycled unit, the back-end ductwork packet
Include back-end surfaces, flue gas recycled preheater, deduster, air-introduced machine and CO2Recyclable device,
Back-end surfaces are sequentially entered by the flue gas that the cyclone separator upper outlet enters, recycled smoke-gas preheater changes
It is exported after heat through deduster, a part enters CO after air-introduced machine2Recyclable device, another part enter again as flue gas recycled
Circulating flue gas unit.
8. system according to claim 7, which is characterized in that the flue gas recycled unit includes flue gas recycled condensation
Device and recirculation blower, the flue gas process into flue gas recycled unit are described in flue gas recycled condenser and recirculation blower
After be delivered to the recycling preheater, be delivered to burner hearth and external combustion chamber as part material after exchanging heat.
9. system according to claim 8, it is characterised in that the wind-supply unit includes external combustor mixer, primary
Wind mixer, Secondary Air mixer and making oxygen by air separation device, the oxygen and flue gas recycled unit of making oxygen by air separation device output are defeated
The flue gas after heat exchange out inputs external combustor mixer, First air mixer and Secondary Air mixer respectively and is mixed,
The external combustor mixer exports external combustion chamber fluidized wind to external combustion chamber；The First air mixer and Secondary Air
Mixer exports First air and Secondary Air to the burner hearth respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710030431.6A CN106838891B (en) | 2017-01-16 | 2017-01-16 | Recirculating fluidized bed oxygen-enriched combustion boiler system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710030431.6A CN106838891B (en) | 2017-01-16 | 2017-01-16 | Recirculating fluidized bed oxygen-enriched combustion boiler system |
Publications (2)
| Publication Number | Publication Date |
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| CN106838891A CN106838891A (en) | 2017-06-13 |
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| CN109253448B (en) * | 2017-07-12 | 2020-05-22 | 清华大学 | Circulating fluidized bed combustion method |
| CN109297015B (en) * | 2018-08-31 | 2019-12-17 | 东南大学 | Coupling pressurization oxygen-enriched combustion device of circulating fluidized bed/bubbling fluidized bed |
| CN112413573B (en) * | 2019-08-21 | 2022-12-27 | 中国科学院工程热物理研究所 | Oxygen-enriched combustion system and oxygen-enriched combustion method of circulating fluidized bed |
| CN114659101B (en) * | 2022-03-25 | 2024-09-13 | 哈尔滨锅炉厂有限责任公司 | Low ash coal CFB boiler calcium-based heat carrier flue gas CO for combustion2Trapping system |
| CN114689789B (en) * | 2022-04-11 | 2023-08-15 | 国网浙江省电力有限公司电力科学研究院 | Flexibility reforms transform unit oxygen boosting burning and hydrogen energy storage safety utilization experimental system |
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Inventor after: Li Shiyuan Inventor after: Li Wei Inventor after: Zhang Xiaotian Inventor after: Xu Mingxin Inventor after: Liu Dianbin Inventor before: Li Shiyuan Inventor before: Li Wei Inventor before: Zhang Xiaotian Inventor before: Xu Mingxin Inventor before: Liu Dianbin |