CN105805730B - Realize the circulating fluidized bed boiler systems of low-nitrogen oxide discharging - Google Patents
Realize the circulating fluidized bed boiler systems of low-nitrogen oxide discharging Download PDFInfo
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- CN105805730B CN105805730B CN201610360176.7A CN201610360176A CN105805730B CN 105805730 B CN105805730 B CN 105805730B CN 201610360176 A CN201610360176 A CN 201610360176A CN 105805730 B CN105805730 B CN 105805730B
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- air
- secondary air
- boiler
- flue gas
- wall
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Classifications
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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
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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
- 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
- F23C10/20—Inlets for fluidisation air, e.g. grids; Bottoms
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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
- F23C2201/00—Staged combustion
- F23C2201/10—Furnace staging
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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
- F23C2202/00—Fluegas recirculation
- F23C2202/30—Premixing fluegas with combustion air
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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
Abstract
The invention discloses a kind of circulating fluidized bed boiler systems for realizing low-nitrogen oxide discharging, including the boiler being sequentially connected, cyclone separator, deduster, air-introduced machine, further include First air air feed system, Secondary Air air feed system, a flue gas recirculation pipe is drawn after air-introduced machine, First air air feed system in parallel on flue gas recirculation pipe, Secondary Air air feed system, Secondary Air air feed system includes overfire air fan, secondary air channel, it is placed in boiler front wall, it more Secondary Air standpipes on the outside of wall and is arranged at afterwards on water-cooling wall with the layered arrangement that Secondary Air standpipe is connected in the overfire air port of boiler dilute-phase zone, the present invention is mixed into partial fume in First air, the fluidization characteristic of emulsion zone when improving underrun, partial fume is mixed into Secondary Air, be conducive to increase the wind speed of overfire air port, avoid the formation of local high temperature zone, reduce NOxGeneration, Secondary Air arrangement of the invention add the perturbation action of flue gas in burner hearth, make full combustion of fuel, reduce NOxGeneration.
Description
Technical field
The invention belongs to the circulating fluidized bed boiler of technical field of boiler combustion, more particularly to realization low-nitrogen oxide discharging
System.
Background technology
NO occupies more than 90% in the nitrogen oxides generated in boiler combustion process, and nitrogen dioxide accounts for 5%-10%, mechanism of production
It is generally divided into following three kinds：（1）Heating power type：During burning, nitrogen aoxidizes generation at high temperature in air, with the liter of reaction temperature T
Height, reaction rate exponentially, work as T<At 1500 DEG C, the growing amount of NO is seldom, and works as T>At 1500 DEG C, T often increases by 100
DEG C, reaction rate increases 6-7 times；（2）Transient response type：The CH that hydrocarbon pyrolytic generates in fuel volatile matter is free
Base further can at a terrific speed generate, when being formed with nitrogen reaction generation HCN and N in air with oxygen effect
Between only need 60ms, what is generated is directly proportional to 0.5 power of furnace pressure, little with the relation of temperature.Above two nitrogen oxidation
Object does not account for NOxMajor part, be not main source.（3）Fuel type NOx：Aoxidized by nitrogen compound in fuel in burning and
Into, since the heat decomposition temperature of nitrogen in fuel is less than coal dust firing temperature, fuel type will be generated at 600-800 DEG C, it
Coal dust firing NOx60-80% is accounted in product, since burning of coal process is by fugitive constituent burning and coke two stage groups of burning
Into, therefore the formation of fuel type is also by the oxidation of gas phase nitrogen（Fugitive constituent）With the oxidation of residual nitrogen in coke（Coke）Two parts group
Into.
It is called in response to country, realizes qualified discharge, most power plant carry out SNCR denitration transformation, reached although can realize
Mark discharge, but there are the problem of ammonia consumption is high, operating cost is high and unburned carbon in flue dust is higher, can also boiler tail be brought to be heated
The etching problem in face.For the coal-burning boiler of no denitration device and denitration burner, low-NO_x combustion technology can only be used
To reduce NOxGeneration chance.Low-NO_x combustion technology has tremendous development in recent years, as be easiest to realize and also it is most economical
A kind of Emission Controlling Technology of Nitric Oxides, low-NO_x combustion technology are generally used in the pulverized-coal fired boiler field of coal-burning power plant.And it follows
Circulation fluidized bed boiler combustion technology is due to distinctive low-temperature burning and Secondary Air classification arrangement, and formation of nitrogen oxides is all
Less than the common pulverized-coal fired boiler for using equal fuel, although Secondary Air entrance air hose hierarchical arrangement form can meet boiler
Requirement to secondary air flow, but Secondary Air is poor to the perturbation action of flue gas in burner hearth, and it is abundant in burner hearth to be unfavorable for fuel
Burning.
In order to reduce the generation of nitrogen oxides, often use and reduce the excess air coefficient of burning, reduce boiler combustion
Peak temperature, but the abundant burning of boiler fuel can be so influenced, oxygen concentration is too low (less than 3%) in boiler, can increase chemistry
Heat loss due to incomplete combustion causes unburned carbon in flue dust to increase, and declines boiler combustion efficiency.Therefore, it is necessary to design to drop
Low-nitrogen oxide discharging can improve the circulating fluidized bed boiler systems of fuel economy again.
The content of the invention
In view of the deficienciess of the prior art, the technical problem to be solved by the invention is to provide a kind of reasonable Arrangements one
Secondary wind, Secondary Air fractional combustion can realize the recycle stream that low-nitrogen oxide discharging, fuel economy are high, unburned carbon in flue dust is low
Fluidized bed boiler system.
In order to solve the above technical problems, the technical solution used in the present invention is：Realize the cycling of low-nitrogen oxide discharging
Fluidized bed boiler systems, including boiler, cyclone separator, deduster, the air-introduced machine being sequentially connected, the boiler inner wall four sides wall
It is equipped with to open up and allows the water-cooling wall of pipe, upper boiler is dilute-phase zone, lower part is emulsion zone, and boiler bottommost is set for First air cloth
The water-cooled distributor of wind further includes First air air feed system, Secondary Air air feed system, and a flue gas is drawn after air-introduced machine and is followed again
Endless tube, the flue gas recirculation Guan Shangshe mono- are used to adjusting the electric control valve of circulating flue gas flow, on flue gas recirculation pipe simultaneously
Join First air air feed system, Secondary Air air feed system, the First air air feed system includes primary air fan and primary air piping, flue gas
Recirculation pipe connects primary air fan entrance, Secondary Air by being equipped with the flue gas recirculation First air branch pipe of flue gas recirculation primary air fan
Air feed system includes overfire air fan, secondary air channel, is placed in boiler front wall, more Secondary Air standpipes on the outside of rear wall and is arranged at water
With the layered arrangement that Secondary Air standpipe is connected in the overfire air port of boiler dilute-phase zone in cold wall, overfire air port includes double spouts
And single jet, flue gas recirculation pipe connect Secondary Air by being equipped with the flue gas recirculation Secondary Air branch pipe of flue gas recirculation overfire air fan
Pipe, it is described pipe to be allowed including single hole to allow pipe and diplopore allows pipe.
Further, the flue gas recirculation primary air fan and the outlet of flue gas recirculation overfire air fan set electric butterfly valve respectively
With the wind pressure transmitter for remote detection wind pressure.
Further, the boiler front wall both sides respectively set the standpipe of a connection front wall single jet, and centre sets two connections
The standpipe of the double spouts of front wall, the caliber of intermediate two standpipes are 2-3 times of the two standpipe calibers in both sides, the front wall single jet and
Two spout centre positions of the double spouts of front wall are located in same horizontal line.
Further, wall sets five Secondary Air standpipes, the Secondary Air standpipe of both sides two and centre one two after the boiler
The secondary double spouts of wind standpipe connection, remaining two Secondary Air standpipe connection single jet, the spacing of two spouts of intermediate double spouts are big
In the double spouts in both sides, the caliber for connecting the standpipe of double spouts is 2-3 times of the standpipe caliber for connecting single jet, the single jet and
The upper spout of double spouts is located in same horizontal line, in two spouts of lower spout and intermediate double spouts of the double spouts in the both sides
Meta position is setting in same horizontal line.
Further, Secondary Air header between the secondary air channel and Secondary Air standpipe is set, is ensured from each Secondary Air
The Secondary Air that spout is sprayed into boiler is heated evenly, and reduces thermal deviation.
Further, the front wall single jet allows pipe that Secondary Air is sprayed into pot by the single hole on boiler front water wall
Stove, the double spouts of the front wall allow pipe that Secondary Air is sprayed into boiler by the diplopore on boiler front water wall.
Further, the single jet on the rear wall allows pipe to spray into Secondary Air by the single hole on boiler rear water wall
Boiler, double spouts allow pipe that Secondary Air is sprayed into boiler by the diplopore on boiler rear water wall.
Further, the overfire air port is not less than 1.5m apart from water-cooling wall bottom.
Further, the Secondary Air riser length is 6-8 times of its caliber.
Further, a reducing is set on the secondary air channel.
Compared with prior art, the invention has the advantages that：
（1）Using flue gas recirculation, partial fume is mixed into First air, the stream of emulsion zone during by ensureing underload
Change wind speed, the fluidization characteristic of emulsion zone, strengthens the mixing of emulsion zone when improving underrun, and more pulverized coal particle band
To dilute-phase zone, emulsion zone combustion share and temperature are reduced, makes the temperature in entire burner hearth more uniform；In high load capacity, portion
Flue gas is divided to be mixed into First air, enriches emulsion zone temperature adjustment means, emulsion zone oxygen concentration is reduced, advantageously reduces NOxGeneration；
（2）Partial fume is mixed into Secondary Air, is conducive to increase the wind speed of overfire air port, strengthens dilute-phase zone gas
Gu, gas gas mixing, be conducive to avoid the formation of local high temperature zone, so as to reduce NOxGeneration；In addition using flue gas recirculation certain
Burner hearth and the flow velocity in heat convection area are improved in degree, is conducive to improve Cyclone efficiency, improves circulating ratio, extend
Residence time of the flying dust in stove, be conducive to fly ash refiring；Circulating ash quantity increase simultaneously is also beneficial to control material layer temperature, cigarette
Gas recycles the bulk temperature for reducing burner hearth, is also beneficial to reduce nitrogen oxides；
（3）Conventional recycle fluidized-bed combustion boiler secondary air channel is evenly arranged in boiler, although this kind of arrangement form can expire
Requirement of the sufficient boiler to secondary air flow, but Secondary Air is poor to the perturbation action of flue gas in burner hearth, is unfavorable for fuel in burner hearth
Abundant burning, be also unfavorable for the fractional combustion of burner hearth fuel and be layered to wind, the present invention, which passes through, sets double spouts and single spraying
The caliber of mouth, adjustment overfire air port standpipe, not only realizes the classification of Secondary Air short transverse, while realizes horizontal direction point
Grade, to reach the evenly distributed target of burner hearth oxygen amount；
（4）The Secondary Air arrangement of the present invention adds the perturbation action of flue gas in burner hearth, makes full combustion of fuel, drops
Low NOxGeneration；
（5）By improving the position of overfire air port, apart from water-cooling wall bottom not less than 1.5m, the close phase reduction in increase lower part
Area's height, so as to increase the recovery time, NO that more coal initiation combustions is allowed to generatexIt is reduced to N2；
（6）Secondary Air riser length is 6-8 times of its caliber, ensures that Secondary Air enters stove interior energy and forms good jet stream spray
Effect is penetrated, keeps basic range without being spread；
（7）Secondary air channel sets a reducing, increases Secondary Air inlet velocity, increases the disturbance of flue gas in burner hearth, fills fuel
Divided combustion；
（8）Flue gas recirculation Guan Shangshe mono- is used to adjust the electric control valve of circulating flue gas flow, and flue gas recirculation is once
Wind branch pipe
With electric butterfly valve and the wind pressure transmitter for remote detection wind pressure are set on flue gas recirculation Secondary Air branch pipe respectively,
First air circulating flue gas, the air quantity of Secondary Air flue gas recirculation flue gas can be automatically adjusted respectively, by adjusting the ratio of primary and secondary air
Example can control combustion state and furnace outlet to a certain extent（Separator inlet）Flue gas oxygen content, so as to NOxUnder discharge capacity
Drop；
（9）For the present invention compared with SNCR denitration technology, operating cost is low, and denitrfying agent is not required, and boiler tail will not be caused to be heated
The corrosion in face.
Description of the drawings
Fig. 1 is the process flow chart of the present invention；
Fig. 2 is the flue gas recirculation air passage layout drawing of the present invention；
Fig. 3 is the arrangement schematic diagram of the burner hearth inner second air spout of the present invention；
The front water wall that Fig. 4 is the present invention allows the pipe location drawing；
The rear water wall that Fig. 5 is the present invention allows the pipe location drawing.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment is described in further details the present invention.
As shown in the figure, realize low-nitrogen oxide discharging circulating fluidized bed boiler systems, including be sequentially connected boiler 1,
Cyclone separator 22, deduster 19, air-introduced machine 17 and smoke evacuation chimney 16,1 inner wall four sides wall of boiler, which is equipped with to open up, allows the water cooling of pipe
Wall 25,1 top of boiler is dilute-phase zone, lower part is emulsion zone, and 1 bottommost of boiler is set for the water-cooled distributor of First air cloth wind
24, First air air feed system, Secondary Air air feed system are further included, a flue gas recirculation pipe 14, cigarette are drawn after air-introduced machine 17
One is set on gas recirculation pipe 14 for adjusting the electric control valve 15 of circulating flue gas flow, on flue gas recirculation pipe 14 it is in parallel once
Wind air feed system, Secondary Air air feed system allow pipe including single hole to allow pipe and diplopore allow pipe.
First air air feed system includes primary air fan 20 and primary air piping 23, and flue gas recirculation pipe 14 is by being equipped with flue gas again
The flue gas recirculation First air branch pipe 18 of circulation primary wind turbine 13 connects 20 entrance of primary air fan, and flue gas recirculation primary air fan 13 goes out
Mouth is equipped with First air electric butterfly valve 12 and the First air wind pressure transmitter 11 for remote detection wind pressure.
Secondary Air air feed system include overfire air fan 10, secondary air channel 5, be placed in boiler front wall 27, the outside of rear wall 30 it is more
It root Secondary Air standpipe 3 and is arranged on water-cooling wall 25 with the layered arrangement that Secondary Air standpipe 3 is connected in the secondary of 1 dilute-phase zone of boiler
Wind snout 2, overfire air port 2 include double spouts and single jet, and flue gas recirculation pipe 14 is by being equipped with flue gas recirculation Secondary Air
The flue gas recirculation Secondary Air branch pipe 6 of machine 9 connects secondary air channel 5, and the outlet of flue gas recirculation overfire air fan 9 is equipped with the electronic butterfly of Secondary Air
Valve 8 and the Secondary Air wind pressure transmitter 7 for remote detection wind pressure.
Secondary Air header 4 between secondary air channel 5 and Secondary Air standpipe 3 is set, ensures to spray into pot from each overfire air port 2
Secondary Air in stove 1 is heated evenly, and reduces thermal deviation, a reducing 26 is set on secondary air channel 5, increase Secondary Air inlet velocity, increase
Add the disturbance of flue gas in burner hearth, make full combustion of fuel.
27 both sides of boiler front wall respectively set the standpipe of a connection front wall single jet 28, and centre sets two double spouts of connection front wall
29 standpipe, the caliber of intermediate two standpipes are 2-3 times of the two standpipe calibers in both sides, to reach point of Secondary Air horizontal direction
Grade, front wall single jet 28 and two spout centre positions of the double spouts 29 of front wall are located in same horizontal line, to reach Secondary Air
The classification of short transverse, the front wall single jet 28 allow pipe 35 by Secondary Air by the front wall single hole on boiler front water wall 34
Boiler 1 is sprayed into, the double spouts 29 of front wall allow pipe 36 that Secondary Air is sprayed into boiler by the front wall diplopore on boiler front water wall 34
1。
Wall 30 sets five Secondary Air standpipes after boiler, and the Secondary Air standpipe of both sides two connects the double spouts 33 in Hou Qiang both sides, in
Between double spouts 31, wall single jet 32 after remaining two Secondary Air standpipes connection, rear wall among wall after the connection of Secondary Air standpipe
The spacing of two spouts of intermediate double spouts 31 is more than two spouts of the double spouts 33 in Hou Qiang both sides, the double spouts in connection Hou Qiang both sides
33 and rear wall among the calibers of standpipe of double spouts 31 be 2-3 times of the standpipe caliber of wall single jet 32 after connection, to reach two
The classification in secondary wind levels direction, the rear wall single jet 32, the double spouts of upper spout and rear wall centre of the double spouts 33 in Hou Qiang both sides
31 upper spout is located in same horizontal line, 31 two spouts of double spouts among the lower spout and rear wall of the double spouts 33 in Hou Qiang both sides
Centre position be located in same horizontal line, to reach the classification of Secondary Air short transverse, it is described after wall single jet 32 pass through pot
Rear wall single hole on stove rear water wall 37 allows pipe 39 that Secondary Air is sprayed into boiler 1, after the double spouts 33 in Hou Qiang both sides are by boiler
Hou Qiang both sides diplopore on wall water-cooling wall 37 allows pipe 40 that Secondary Air is sprayed into boiler, and double spouts 31 pass through wall after boiler among rear wall
Diplopore allows pipe 38 that Secondary Air is sprayed into boiler among rear wall on water-cooling wall 37.
The double spouts 29 of front wall are apart from 34 bottom of front water wall not less than 1.5m, and the rear double spouts 31 in wall centre are apart from rear wall water
37 bottom of cold wall is not less than 1.5m, increases lower part Mi Xiang reducing zones height, so as to increase the recovery time, more coal initial stages is allowed to fire
Burn the NO generatedxIt is reduced to N2。
3 length of Secondary Air standpipe is 6-8 times of its caliber, enters jet stream in stove to guarantee to be formed good Secondary Air
Jeting effect keeps basic range without being spread.
Coal dust is in boiler 1 after low nitrogen burning, and ash-laden gas is after the processing of cyclone separator 22, and flue gas is from back-end ductwork
21 remove particulate matter into deduster 19, and clean flue gas again make to discharge from smoke evacuation chimney 16 under 17 use by air-introduced machine.Meanwhile in air-introduced machine
Flue gas recirculation pipe 14 is drawn after 17, partial fume is mixed into First air, the fluidisation of emulsion zone during by ensureing underload
Wind speed, the fluidization characteristic of emulsion zone, strengthens the mixing of emulsion zone, and more pulverized coal particle is taken to when improving underrun
Dilute-phase zone reduces emulsion zone combustion share and temperature, makes the temperature in entire burner hearth more uniform；In high load capacity, part
Flue gas is mixed into First air, enriches emulsion zone temperature adjustment means, is reduced emulsion zone oxygen concentration, is advantageously reduced NOxGeneration.
Partial fume is mixed into Secondary Air, is conducive to increase the wind speed of overfire air port, strengthens dilute-phase zone gas-solid, gas
Gas mixes, and is conducive to avoid the formation of local high temperature zone, so as to reduce NOxGeneration；In addition using flue gas recirculation to a certain degree
On improve burner hearth and the flow velocity in heat convection area, be conducive to improve Cyclone efficiency, improve circulating ratio, extend flying dust
Residence time in stove, be conducive to fly ash refiring；Circulating ash quantity increase simultaneously is also beneficial to control material layer temperature, and flue gas is again
Xun Huan reduces the bulk temperature of burner hearth, is also beneficial to reduce nitrogen oxides.
In conclusion the present invention is mixed into partial fume in First air, the fluidisation of emulsion zone during by ensureing underload
Wind speed, the fluidization characteristic of emulsion zone, strengthens the mixing of emulsion zone, and more pulverized coal particle is taken to when improving underrun
Dilute-phase zone reduces emulsion zone combustion share and temperature, makes the temperature in entire burner hearth more uniform；Partial fume is mixed into two
In secondary wind, be conducive to increase the wind speed of overfire air port, strengthen dilute-phase zone gas-solid, the mixing of gas gas, be conducive to avoid the formation of part
High-temperature region, so as to reduce NOxGeneration, improves burner hearth and the flow velocity in heat convection area to a certain extent, is conducive to improve whirlwind
Efficiency separator improves circulating ratio, extends residence time of the flying dust in stove, is conducive to fly ash refiring；Circulating ash quantity simultaneously
Increase is also beneficial to control material layer temperature, and flue gas recirculation reduces the bulk temperature of burner hearth, is also beneficial to reduce nitrogen oxidation
Object；The Secondary Air arrangement of the present invention adds the perturbation action of flue gas in burner hearth, makes full combustion of fuel, reduces NOx
Generation, by setting double spouts with single jet, adjusting the caliber of overfire air port standpipe, not only realize Secondary Air height side
To classification, while realize horizontal direction be classified, to reach the evenly distributed target of burner hearth oxygen amount；By in flue gas recirculation one
Electric butterfly valve and the wind pressure transmitter for remote detection wind pressure are set respectively on secondary wind branch pipe and flue gas recirculation Secondary Air branch pipe,
First air circulating flue gas, the air quantity of Secondary Air flue gas recirculation flue gas can be adjusted respectively, it can by adjusting the ratio of primary and secondary air
Combustion state and furnace outlet are controlled to a certain extent（Separator inlet）Flue gas oxygen content, so as to NOxDischarge capacity declines；Fortune
Row is at low cost, will not cause boiler corrosion problem.
Certainly, it is limitation of the present invention that above description, which is not, and the present invention is also not limited to the example above, the art
Those of ordinary skill, in the essential scope of the present invention, the variations, modifications, additions or substitutions made should all belong to the present invention
Protection domain.
Claims (6)
1. realize the circulating fluidized bed boiler systems of low-nitrogen oxide discharging, including be sequentially connected boiler, cyclone separator, remove
Dirt device, air-introduced machine, the boiler inner wall four sides wall, which is equipped with to open up, allows the water-cooling wall of pipe, and upper boiler is dilute-phase zone, lower part is
Emulsion zone, boiler bottommost are set for the water-cooled distributor of First air cloth wind, further include First air air feed system, Secondary Air air feed
System, it is characterised in that：A flue gas recirculation pipe is drawn after air-introduced machine, the flue gas recirculation Guan Shangshe mono- is used to adjust
The electric control valve of circulating flue gas flow, First air air feed system in parallel, Secondary Air air feed system, described on flue gas recirculation pipe
First air air feed system includes primary air fan and primary air piping, and flue gas recirculation pipe is by being equipped with flue gas recirculation primary air fan
Flue gas recirculation First air branch pipe connects primary air fan entrance, and Secondary Air air feed system includes overfire air fan, secondary air channel, is placed in pot
More Secondary Air standpipes on the outside of stokehold wall, rear wall and the layered arrangement being connected on water-cooling wall with Secondary Air standpipe is arranged in pot
The overfire air port of stove dilute-phase zone, overfire air port include double spouts and single jet, and flue gas recirculation pipe is by being equipped with flue gas again
The flue gas recirculation Secondary Air branch pipe of circulation secondary wind turbine connects secondary air channel, described pipe to be allowed including single hole to allow pipe and diplopore allows pipe,
The boiler front wall both sides respectively set the standpipe of a connection front wall single jet, and centre sets the standpipe of two double spouts of connection front wall,
The caliber of intermediate two standpipes is 2-3 times of the two standpipe calibers in both sides, two of the front wall single jet and front wall pair spouts
Spout centre position is located in same horizontal line, and wall sets five Secondary Air standpipes, the Secondary Air standpipe of both sides two after the boiler
Double spouts are connected with piece Secondary Air standpipe in centre, wall single jet after remaining two Secondary Air standpipe connection, intermediate double spouts
The spacing of two spouts is more than the double spouts in both sides, and the caliber for connecting the standpipe of double spouts is the 2- for the standpipe caliber for connecting single jet
3 times, the upper spout of the single jet and double spouts is located in same horizontal line, and the lower spout of the double spouts in the both sides and centre are double
The centre position of two spouts of spout is located in same horizontal line, and Secondary Air is set between the secondary air channel and Secondary Air standpipe
Header ensures to be heated evenly from the Secondary Air that each overfire air port is sprayed into boiler, reduces thermal deviation, the overfire air port
It is not less than 1.5m apart from water-cooling wall bottom.
2. the circulating fluidized bed boiler systems according to claim 1 for realizing low-nitrogen oxide discharging, it is characterised in that：Institute
It states flue gas recirculation primary air fan and the outlet of flue gas recirculation overfire air fan sets electric butterfly valve and for remote detection wind pressure respectively
Wind pressure transmitter.
3. the circulating fluidized bed boiler systems according to claim 1 for realizing low-nitrogen oxide discharging, it is characterised in that：Institute
State front wall single jet allows pipe that Secondary Air is sprayed into boiler by the single hole on boiler front water wall, and the double spouts of the front wall pass through
Diplopore on boiler front water wall allows pipe that Secondary Air is sprayed into boiler.
4. the circulating fluidized bed boiler systems according to claim 1 for realizing low-nitrogen oxide discharging, it is characterised in that：Institute
State rear wall single jet allows pipe that Secondary Air is sprayed into boiler by the single hole on boiler rear water wall, and double spouts pass through wall after boiler
Diplopore on water-cooling wall allows pipe that Secondary Air is sprayed into boiler.
5. the circulating fluidized bed boiler systems according to claim 1 for realizing low-nitrogen oxide discharging, it is characterised in that：Institute
State 6-8 times that Secondary Air riser length is its caliber.
6. the circulating fluidized bed boiler systems according to claim 1 for realizing low-nitrogen oxide discharging, it is characterised in that：Institute
It states and a reducing is set on secondary air channel.
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| CN201610360176.7A CN105805730B (en) | 2016-05-27 | 2016-05-27 | Realize the circulating fluidized bed boiler systems of low-nitrogen oxide discharging |
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| CN201610360176.7A CN105805730B (en) | 2016-05-27 | 2016-05-27 | Realize the circulating fluidized bed boiler systems of low-nitrogen oxide discharging |
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| CN107166428B (en) * | 2017-07-24 | 2023-05-23 | 廊坊市华源盛世热力有限公司 | Layer combustion boiler flue gas oxygen content control system based on flue gas recirculation |
| CN111964254A (en) * | 2020-09-04 | 2020-11-20 | 大通万腾采暖设备有限公司 | Double five-return stroke numerical control boiler |
| CN112984501B (en) * | 2021-02-23 | 2024-02-20 | 河南省锅炉压力容器安全检测研究院 | Low-nitrogen combustion process of gas boiler |
| CN114459023B (en) * | 2021-09-20 | 2022-11-22 | 哈尔滨博深科技发展有限公司 | In-furnace forced denitration device for ultralow-load operation of circulating fluidized bed boiler |
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- 2016-05-27 CN CN201610360176.7A patent/CN105805730B/en not_active Expired - Fee Related
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| JPH1151343A (en) * | 1997-08-04 | 1999-02-26 | Hitachi Zosen Corp | Fluidized bed incinerator |
| CN202868674U (en) * | 2012-10-15 | 2013-04-10 | 黄震 | High-efficiency low-energy-consumption smoke denitration device of circulating fluidized bed boiler |
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| CN205782865U (en) * | 2016-05-27 | 2016-12-07 | 青岛金田热电有限公司 | Realize the circulating fluidized bed boiler systems of low-nitrogen oxide discharging |
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