CN105805730A - Circulating fluidized bed boiler system for achieving low nitrogen oxide discharge - Google Patents

Circulating fluidized bed boiler system for achieving low nitrogen oxide discharge Download PDF

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Publication number
CN105805730A
CN105805730A CN201610360176.7A CN201610360176A CN105805730A CN 105805730 A CN105805730 A CN 105805730A CN 201610360176 A CN201610360176 A CN 201610360176A CN 105805730 A CN105805730 A CN 105805730A
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China
Prior art keywords
boiler
flue gas
air
secondary wind
wall
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CN201610360176.7A
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CN105805730B (en
Inventor
董爱君
姜玉旭
张式雷
李兴全
徐夕仁
崔秀宝
梁法志
李兆春
张川云
于祥红
杨建国
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Qingdao Jintian Thermal Power Co Ltd
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Qingdao Jintian Thermal Power Co Ltd
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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
    • 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
    • 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
    • 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
    • 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
    • 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 circulating fluidized bed boiler system for achieving low nitrogen oxide discharge. The circulating fluidized bed boiler system comprises a boiler, a cyclone separator, a dust remover and an induced draft fan which are sequentially connected. The circulating fluidized bed boiler system further comprises a primary air supply system and a secondary air supply system. A flue gas recirculation pipe is guided out of the rear portion of the induced draft fan and connected with the primary air supply system and the secondary air supply system in parallel. The secondary air supply system comprises a secondary air fan, a secondary air pipe, a plurality of secondary air vertical pipes arranged on the outer sides of a front wall and a rear wall of the boiler and secondary air nozzles, wherein the secondary air nozzles are arranged on a water cooling wall, connected with the secondary air vertical pipes and arranged in a dilute phase area of the boiler in a layered manner. According to the circulating fluidized bed boiler system, part of flue gas is mixed into primary air, the fluidization characteristic of a dense phase area during low-load running is improved, part of flue gas is mixed into secondary air, the air speed of the secondary air nozzles can be increased easily, a local high-temperature area is avoided, and generated NOx is reduced. By means of the secondary air arrangement manner of the system, the disturbance function of the flue gas in a hearth is increased, fuel is combusted fully, and the generated NOx is reduced.

Description

Realize the circulating fluidized bed boiler systems of low-nitrogen oxide discharging
Technical field
The invention belongs to technical field of boiler combustion, particularly to the circulating fluidized bed boiler systems realizing low-nitrogen oxide discharging.
Background technology
In the nitrogen oxides produced in boiler combustion process, NO occupies more than 90%, nitrogen dioxide accounts for 5%-10%, mechanism of production is generally divided into following three kinds: (1) heating power type: during burning, and in air, nitrogen at high temperature aoxidizes generation, along with the rising of reaction temperature T, its reaction rate is exponentially, when T<1500 DEG C, the growing amount of NO is little, and as T>1500 DEG C time, T often increases by 100 DEG C, and reaction rate increases 6-7 times；(2) transient response type: the CH free radical that in fuel volatile matter, Hydrocarbon pyrolytic generates can generate HCN and N with nitrogen reaction in air, further generate at a terrific speed with oxygen effect, its formation time has only to 60ms, what generated is directly proportional to furnace pressure 0.5 power, little with the relation of temperature.Above two nitrogen oxides does not account for NOxMajor part, be not main source.(3) fuel type NOx: being aoxidized in burning by nitrogen compound in fuel and form, owing in fuel, the heat decomposition temperature of nitrogen, lower than coal dust firing temperature, will generate fuel type when 600-800 DEG C, it is at coal dust firing NOxAccounting for 60-80% in product, owing to burning of coal process was made up of fugitive constituent burning and coke two stages of burning, therefore the formation of fuel type is also made up of oxidation (coke) two parts of residual nitrogen in the oxidation (fugitive constituent) of gas phase nitrogen and coke.
In response to country calls, it is achieved qualified discharge, most power plant carry out SNCR denitration transformation, although are capable of qualified discharge, but there is the problem that ammonia consumption is high, operating cost is high and unburned carbon in flue dust is higher, also can bring the etching problem of heated surface at the end of boiler.For there is no denitration device and the coal-burning boiler of denitration burner, low-NO_x combustion technology can only be adopted to reduce NOxGeneration chance.Low-NO_x combustion technology has had tremendous development in recent years, and as being easiest to realize and most economical a kind of Emission Controlling Technology of Nitric Oxides, low-NO_x combustion technology is generally used in the pulverized-coal fired boiler field of coal-burning power plant.And circulating fluidized-bed boiler Combustion technology is due to distinctive low-temperature burning and secondary wind classification arrangement, its formation of nitrogen oxides is below using the common pulverized-coal fired boiler of equal fuel, but although secondary wind entrance airduct hierarchical arrangement form can meet the boiler requirement to secondary air flow, but secondary wind is poor to the perturbation action of flue gas in burner hearth, it is unfavorable for the fuel abundant burning in burner hearth.
In order to reduce the generation of nitrogen oxides, the peak temperature often adopt the excess air coefficient reducing burning, reducing boiler combustion, but so can affect the abundant burning of boiler fuel, oxygen concentration too low (less than 3%) in boiler, heat loss due to unburned gas can be increased, cause unburned carbon in flue dust to increase, make boiler combustion efficiency decline.Discharged nitrous oxides can be reduced can improve again the circulating fluidized bed boiler systems of fuel economy accordingly, it would be desirable to design.
Summary of the invention
For the deficiency that prior art exists, the technical problem to be solved is to provide a kind of reasonable Arrangement First air, secondary wind fractional combustion, can realize low-nitrogen oxide discharging, fuel economy is high, unburned carbon in flue dust is low circulating fluidized bed boiler systems.
nullFor solving above-mentioned technical problem，The technical solution used in the present invention is: realize the circulating fluidized bed boiler systems of low-nitrogen oxide discharging，Including the boiler being sequentially connected、Cyclone separator、Cleaner unit、Air-introduced machine，Described boiler inner wall four sides wall is provided with to offer and allows the water-cooling wall of pipe，Upper boiler is dilute-phase zone、Bottom is emulsion zone，Boiler bottommost sets the water-cooled distributor for First air cloth wind，Also include First air air feed system、Secondary wind air feed system，A flue gas recirculation pipe is drawn after air-introduced machine，Described flue gas recirculation Guan Shangshe mono-is for regulating the electric control valve of circulating flue gas flow，First air air feed system in parallel on flue gas recirculation pipe、Secondary wind air feed system，Described First air air feed system includes primary air fan and primary air piping，Flue gas recirculation pipe connects primary air fan entrance by being provided with the flue gas recirculation First air arm of flue gas recirculation primary air fan，Secondary wind air feed system includes overfire air fan、Secondary air channel、It is placed in boiler front wall、Many secondary wind standpipes outside rear wall and the layered arrangement that is arranged on water-cooling wall to be connected with secondary wind standpipe are in the overfire air port of boiler dilute-phase zone，Overfire air port includes double; two spout and single jet，Flue gas recirculation pipe connects secondary air channel by being provided with the flue gas recirculation secondary wind arm of flue gas recirculation overfire air fan，Described allow pipe include single hole to allow pipe and diplopore allow pipe.
Further, described flue gas recirculation primary air fan and the outlet of flue gas recirculation overfire air fan set electric butterfly valve and respectively for remotely detecting the wind pressure transmitter of blast.
Further, described boiler front wall both sides respectively set one and connect the one-jet standpipe of front wall, centre sets two standpipes connecting the double; two spout of front wall, two spout centre positions that the caliber of middle two standpipes is the double; two spout of 2-3 times of the two standpipe calibers in both sides, described front wall single jet and front wall are positioned on same level line.
Further, after described boiler, wall sets five secondary wind standpipes, two, both sides secondary wind standpipe is connected double; two spout with a middle secondary wind standpipe, all the other two secondary wind standpipes connect single jet, the spacing of two spouts of middle double; two spout is more than the double; two spout in both sides, the caliber connecting the standpipe of double; two spout is 2-3 times that connects one-jet standpipe caliber, the upper spout of described single jet and double; two spouts is positioned on same level line, and the centre position of double; two two spouts of spout of lower spout and centre of the double; two spout in described both sides is positioned on same level line.
Further, secondary wind header is set between described secondary air channel and secondary wind standpipe, it is ensured that the secondary wind sprayed in boiler from each overfire air port is heated evenly, reduces thermal deviation.
Further, described front wall single jet allows pipe that secondary wind sprays into boiler by the single hole on boiler front water wall, and the double; two spout of described front wall allows pipe that secondary wind is sprayed into boiler by the diplopore on boiler front water wall.
Further, the single jet on described rear wall allows pipe that secondary wind sprays into boiler by the single hole on boiler rear water wall, and double; two spouts allow pipe that secondary wind is sprayed into boiler by the diplopore on boiler rear water wall.
Further, it is not less than 1.5m bottom described overfire air port distance water-cooling wall.
Further, described secondary wind riser length is 6-8 times of its caliber.
Further, described secondary air channel sets a reducing.
Compared with prior art, the invention has the advantages that:
(1) flue gas recirculation is adopted, partial fume is mixed in First air, the fluidising air velocity of emulsion zone during by guarantee underload, improve the fluidization characteristic of emulsion zone during underrun, the mixing of strengthening emulsion zone, and more pulverized coal particle is taken to dilute-phase zone, reduce emulsion zone combustion share and temperature, make the temperature in whole burner hearth more uniform；When high load capacity, partial fume is mixed in First air, abundant emulsion zone homoiothermic means, reduce emulsion zone oxygen concentration, advantageously reduce NOxGeneration；
(2) partial fume is mixed in secondary wind, being conducive to increasing the wind speed of overfire air port, strengthening dilute-phase zone gas-solid, the mixing of gas gas, being conducive to avoiding the formation of district of localized hyperthermia, thus reducing NOxGenerate；Additionally adopt flue gas recirculation to improve burner hearth and the flow velocity in heat convection district to a certain extent, be conducive to improving Cyclone efficiency, improve circulating ratio, extend the flying dust time of staying in stove, be conducive to fly ash refiring；Circulating ash quantity increases simultaneously, 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 oxides；
(3) conventional recycle fluidized-bed combustion boiler secondary air channel is evenly arranged in boiler, although this kind of arrangement form can meet the boiler requirement to secondary air flow, but secondary wind is poor to the perturbation action of flue gas in burner hearth, it is unfavorable for the fuel abundant burning in burner hearth, also it is unfavorable for the fractional combustion of burner hearth fuel and is layered to wind, the present invention is by arranging double; two spout and single jet, the caliber adjusting overfire air port standpipe, not only achieve the classification of secondary wind short transverse, realize horizontal direction classification, to reach the target of burner hearth oxygen amount distributed uniform simultaneously；
(4) the secondary wind arrangement of the present invention adds the perturbation action of flue gas in burner hearth, makes full combustion of fuel, reduces NOxGeneration；
(5) by improving the position of overfire air port, being not less than 1.5m bottom distance water-cooling wall, increase Mi Xiang reducing zone, bottom height, thus increasing the recovery time, allowing the NO that more coal initiation combustion producesxIt is reduced to N2；
(6) secondary wind riser length is 6-8 times of its caliber, it is ensured that secondary wind enters in stove can form good jet jeting effect, keeps basic range not spread；
(7) secondary air channel sets a reducing, increases secondary wind inlet velocity, increases the disturbance of flue gas in burner hearth, makes full combustion of fuel；
(8) flue gas recirculation Guan Shangshe mono-is for regulating the electric control valve of circulating flue gas flow, flue gas recirculation First air arm
With flue gas recirculation secondary wind arm sets electric butterfly valve respectively and for remotely detecting the wind pressure transmitter of blast, the air quantity of First air circulating flue gas, secondary wind flue gas recirculation flue gas can be automatically adjusted respectively, fired state and furnace outlet (separator inlet) flue gas oxygen content can be controlled to a certain extent by adjusting the ratio of primary and secondary air, thus NOxDischarge capacity declines；
(9) present invention relatively SNCR denitration technology, operating cost is low, it is not necessary to denitrfying agent, does not result in the corrosion of heated surface at the end of boiler.
Accompanying drawing explanation
Fig. 1 is the process chart of the present invention；
Fig. 2 is the flue gas recirculation air channel layout drawing of the present invention；
Fig. 3 is the layout schematic diagram of the burner hearth inner second air spout of the present invention；
Fig. 4 is that the front water wall of the present invention allows the pipe location drawing；
Fig. 5 is that the rear water wall of the present invention allows the pipe location drawing.
Detailed description of the invention
Below in conjunction with drawings and the specific embodiments, the present invention is described in further details.
As shown in the figure, realize the circulating fluidized bed boiler systems of low-nitrogen oxide discharging, including the boiler 1 being sequentially connected, cyclone separator 22, cleaner unit 19, air-introduced machine 17 and smoke evacuation chimney 16, boiler 1 inwall four sides wall is provided with to offer and allows the water-cooling wall 25 of pipe, boiler 1 top is dilute-phase zone, bottom is emulsion zone, boiler 1 bottommost sets the water-cooled distributor 24 for First air cloth wind, also include First air air feed system, secondary wind air feed system, a flue gas recirculation pipe 14 is drawn after air-introduced machine 17, flue gas recirculation pipe 14 sets one for regulating the electric control valve 15 of circulating flue gas flow, First air air feed system in parallel on flue gas recirculation pipe 14, secondary wind air feed system, allowing pipe include single hole allows pipe and diplopore allow pipe.
First air air feed system includes primary air fan 20 and primary air piping 23, flue gas recirculation pipe 14 connects primary air fan 20 entrance by being provided with the flue gas recirculation First air arm 18 of flue gas recirculation primary air fan 13, and flue gas recirculation primary air fan 13 outlet is provided with First air electric butterfly valve 12 and for remotely detecting the First air wind pressure transmitter 11 of blast.
Secondary wind air feed system includes overfire air fan 10, secondary air channel 5, be placed in many secondary wind standpipes 3 outside boiler front wall 27, rear wall 30 and the layered arrangement that is arranged on water-cooling wall 25 to be connected with secondary wind standpipe 3 is in the overfire air port 2 of boiler 1 dilute-phase zone, overfire air port 2 includes double; two spout and single jet, flue gas recirculation pipe 14 connects secondary air channel 5 by being provided with the flue gas recirculation secondary wind arm 6 of flue gas recirculation overfire air fan 9, and flue gas recirculation overfire air fan 9 outlet is provided with secondary wind electric butterfly valve 8 and for remotely detecting the secondary wind wind pressure transmitter 7 of blast.
Secondary wind header 4 is set between secondary air channel 5 and secondary wind standpipe 3, it is ensured that the secondary wind sprayed in boiler 1 from each overfire air port 2 is heated evenly, reduces thermal deviation, secondary air channel 5 sets a reducing 26, increase secondary wind inlet velocity, increase the disturbance of flue gas in burner hearth, make full combustion of fuel.
Boiler front wall 27 both sides respectively set a standpipe connecting front wall single jet 28, centre sets two standpipes connecting the double, two spout 29 of front wall, the caliber of middle two standpipes is 2-3 times of the two standpipe calibers in both sides, to reach the classification of secondary wind horizontal direction, two spout centre positions of front wall single jet 28 and the double, two spout 29 of front wall are positioned on same level line, to reach the classification of secondary wind short transverse, described front wall single jet 28 allows pipe 35 that secondary wind sprays into boiler 1 by the front wall single hole on boiler front water wall 34, the double, two spout 29 of front wall allows pipe 36 that secondary wind sprays into boiler 1 by the front wall diplopore on boiler front water wall 34.
nullAfter boiler, wall 30 sets five secondary wind standpipes，Two, both sides secondary wind standpipe connects the double; two spout 33 in Hou Qiang both sides，Double; two spouts 31 in the middle of wall after middle secondary wind standpipe connection，Wall single jet 32 after all the other two secondary wind standpipes connections，In the middle of rear wall, the spacing of two spouts of double; two spouts 31 is more than two spouts of the double; two spout 33 in Hou Qiang both sides，Connecting the caliber of the standpipe of double; two spouts 31 in the middle of the double; two spouts 33 in Hou Qiang both sides and rear wall is after connecting 2-3 times of the standpipe caliber of wall single jet 32，To reach the classification of secondary wind horizontal direction，Described rear wall single jet 32、In the middle of the upper spout of the double; two spout 33 in Hou Qiang both sides and rear wall, the upper spout of double; two spouts 31 is positioned on same level line，In the middle of the lower spout of the double; two spout 33 in Hou Qiang both sides and rear wall, the centre position of double; two 31 two spouts of spout is positioned on same level line，To reach the classification of secondary wind short transverse，Described rear wall single jet 32 allows pipe 39 that secondary wind sprays into boiler 1 by the rear wall single hole on boiler rear water wall 37，The double; two spout 33 in Hou Qiang both sides allows pipe 40 that secondary wind is sprayed into boiler by the Hou Qiang both sides diplopore on boiler rear water wall 37，In the middle of rear wall, double; two spouts 31 allow pipe 38 that secondary wind is sprayed into boiler by diplopore in the middle of the rear wall on boiler rear water wall 37.
The double; two spout 29 of front wall is not less than 1.5m bottom front water wall 34, and in the middle of rear wall, double; two spouts 31 are not less than 1.5m bottom rear water wall 37, increase Mi Xiang reducing zone, bottom height, thus increasing the recovery time, allows the NO that more coal initiation combustion producesxIt is reduced to N2。
Secondary wind standpipe 3 length is 6-8 times of its caliber, to guarantee to form the jet jeting effect in good secondary wind entrance stove, keeps basic range not spread.
Coal dust is in boiler 1 after low nitrogen burning, and ash-laden gas is after cyclone separator 22 processes, and flue gas enters cleaner unit 19 from back-end ductwork 21 and removes particulate matter, discharges from smoke evacuation chimney 16 under clean flue gas air-introduced machine again work 17.Simultaneously, flue gas recirculation pipe 14 is drawn after air-introduced machine 17, partial fume is mixed in First air, the fluidising air velocity of emulsion zone during by guarantee underload, improve the fluidization characteristic of emulsion zone during underrun, the mixing of strengthening emulsion zone, and more pulverized coal particle is taken to dilute-phase zone, reduce emulsion zone combustion share and temperature, make the temperature in whole burner hearth more uniform；When high load capacity, partial fume is mixed in First air, abundant emulsion zone homoiothermic means, reduce emulsion zone oxygen concentration, advantageously reduce NOxGeneration.
Partial fume is mixed in secondary wind, being conducive to increasing the wind speed of overfire air port, strengthening dilute-phase zone gas-solid, the mixing of gas gas, being conducive to avoiding the formation of district of localized hyperthermia, thus reducing NOxGenerate；Additionally adopt flue gas recirculation to improve burner hearth and the flow velocity in heat convection district to a certain extent, be conducive to improving Cyclone efficiency, improve circulating ratio, extend the flying dust time of staying in stove, be conducive to fly ash refiring；Circulating ash quantity increases simultaneously, 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 oxides.
In sum, the present invention is mixed into partial fume in First air, the fluidising air velocity of emulsion zone during by guarantee underload, improve the fluidization characteristic of emulsion zone during underrun, the mixing of strengthening emulsion zone, and more pulverized coal particle is taken to dilute-phase zone, reduce emulsion zone combustion share and temperature, make the temperature in whole burner hearth more uniform；Partial fume is mixed in secondary wind, being conducive to increasing the wind speed of overfire air port, strengthening dilute-phase zone gas-solid, the mixing of gas gas, being conducive to avoiding the formation of district of localized hyperthermia, thus reducing NOxGenerate, improve burner hearth and the flow velocity in heat convection district to a certain extent, be conducive to improving Cyclone efficiency, improve circulating ratio, extend the flying dust time of staying in stove, be conducive to fly ash refiring；Circulating ash quantity increases simultaneously, 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 oxides；The secondary wind arrangement of the present invention adds the perturbation action of flue gas in burner hearth, makes full combustion of fuel, reduces NOxGeneration, by arranging double; two spout and single jet, the caliber adjusting overfire air port standpipe, not only achieve the classification of secondary wind short transverse, realize horizontal direction classification simultaneously, to reach the target of burner hearth oxygen amount distributed uniform；By setting electric butterfly valve on flue gas recirculation First air arm and flue gas recirculation secondary wind arm respectively and for remotely detecting the wind pressure transmitter of blast, the air quantity of First air circulating flue gas, secondary wind flue gas recirculation flue gas can be regulated respectively, fired state and furnace outlet (separator inlet) flue gas oxygen content can be controlled to a certain extent by adjusting the ratio of primary and secondary air, thus NOxDischarge capacity declines；Operating cost is low, does not result in boiler corrosion problem.
Certainly, described above is not limitation of the present invention, and the present invention is also not limited to the example above, those skilled in the art, in the essential scope of the present invention, and change, remodeling, interpolation or the replacement made, all should belong to protection scope of the present invention.

Claims (10)

  1. null1. realize the circulating fluidized bed boiler systems of low-nitrogen oxide discharging，Including the boiler being sequentially connected、Cyclone separator、Cleaner unit、Air-introduced machine，Described boiler inner wall four sides wall is provided with to offer and allows the water-cooling wall of pipe，Upper boiler is dilute-phase zone、Bottom is emulsion zone，Boiler bottommost sets the water-cooled distributor for First air cloth wind，Also include First air air feed system、Secondary wind air feed system，It is characterized in that: after air-introduced machine, draw a flue gas recirculation pipe，Described flue gas recirculation Guan Shangshe mono-is for regulating the electric control valve of circulating flue gas flow，First air air feed system in parallel on flue gas recirculation pipe、Secondary wind air feed system，Described First air air feed system includes primary air fan and primary air piping，Flue gas recirculation pipe connects primary air fan entrance by being provided with the flue gas recirculation First air arm of flue gas recirculation primary air fan，Secondary wind air feed system includes overfire air fan、Secondary air channel、It is placed in boiler front wall、Many secondary wind standpipes outside rear wall and the layered arrangement that is arranged on water-cooling wall to be connected with secondary wind standpipe are in the overfire air port of boiler dilute-phase zone，Overfire air port includes double; two spout and single jet，Flue gas recirculation pipe connects secondary air channel by being provided with the flue gas recirculation secondary wind arm of flue gas recirculation overfire air fan，Described allow pipe include single hole to allow pipe and diplopore allow pipe.
  2. 2. the circulating fluidized bed boiler systems realizing low-nitrogen oxide discharging according to claim 1, it is characterised in that: described flue gas recirculation primary air fan and the outlet of flue gas recirculation overfire air fan set electric butterfly valve and respectively for remotely detecting the wind pressure transmitter of blast.
  3. 3. the circulating fluidized bed boiler systems realizing low-nitrogen oxide discharging according to claim 1, it is characterized in that: described boiler front wall both sides respectively set one and connect the one-jet standpipe of front wall, centre sets two standpipes connecting the double; two spout of front wall, two spout centre positions that the caliber of middle two standpipes is the double; two spout of 2-3 times of the two standpipe calibers in both sides, described front wall single jet and front wall are positioned on same level line.
  4. 4. the circulating fluidized bed boiler systems realizing low-nitrogen oxide discharging according to claim 1, it is characterized in that: after described boiler, wall sets five secondary wind standpipes, two, both sides secondary wind standpipe is connected double, two spout with a middle secondary wind standpipe, wall single jet after all the other two secondary wind standpipes connections, the spacing of two spouts of middle double, two spout is more than the double, two spout in both sides, the caliber connecting the standpipe of double, two spout is 2-3 times that connects one-jet standpipe caliber, the upper spout of described single jet and double, two spouts is positioned on same level line, the centre position of double, two two spouts of spout of lower spout and centre of the double, two spout in described both sides is positioned on same level line.
  5. 5. the circulating fluidized bed boiler systems realizing low-nitrogen oxide discharging according to claim 1, it is characterized in that: secondary wind header is set between described secondary air channel and secondary wind standpipe, ensure that the secondary wind sprayed in boiler from each overfire air port is heated evenly, reduce thermal deviation.
  6. 6. the circulating fluidized bed boiler systems realizing low-nitrogen oxide discharging according to claim 3, it is characterized in that: described front wall single jet allows pipe that secondary wind sprays into boiler by the single hole on boiler front water wall, the double; two spout of described front wall allows pipe that secondary wind is sprayed into boiler by the diplopore on boiler front water wall.
  7. 7. the circulating fluidized bed boiler systems realizing low-nitrogen oxide discharging according to claim 4, it is characterized in that: described rear wall single jet allows pipe that secondary wind sprays into boiler by the single hole on boiler rear water wall, and double; two spouts allow pipe that secondary wind is sprayed into boiler by the diplopore on boiler rear water wall.
  8. 8. the circulating fluidized bed boiler systems realizing low-nitrogen oxide discharging according to claim 1, it is characterised in that: it is not less than 1.5m bottom described overfire air port distance water-cooling wall.
  9. 9. the circulating fluidized bed boiler systems realizing low-nitrogen oxide discharging according to claim 1, it is characterised in that: described secondary wind riser length is 6-8 times of its caliber.
  10. 10. the circulating fluidized bed boiler systems realizing low-nitrogen oxide discharging according to claim 1, it is characterised in that: described secondary air channel sets a reducing.
CN201610360176.7A 2016-05-27 2016-05-27 Realize the circulating fluidized bed boiler systems of low-nitrogen oxide discharging Expired - Fee Related CN105805730B (en)

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Cited By (4)

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CN114459023A (en) * 2021-09-20 2022-05-10 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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