CN106196044A - Low NO is put at a kind of end being applicable to significantly load adjustment - Google Patents
Low NO is put at a kind of end being applicable to significantly load adjustment Download PDFInfo
- Publication number
- CN106196044A CN106196044A CN201610783158.XA CN201610783158A CN106196044A CN 106196044 A CN106196044 A CN 106196044A CN 201610783158 A CN201610783158 A CN 201610783158A CN 106196044 A CN106196044 A CN 106196044A
- Authority
- CN
- China
- Prior art keywords
- outlet
- air
- low
- applicable
- wide diameter
- Prior art date
Links
- 239000003570 air Substances 0.000 claims abstract description 75
- 239000002817 coal dust Substances 0.000 claims abstract description 34
- 238000002485 combustion reactions Methods 0.000 claims abstract description 33
- 239000000843 powders Substances 0.000 claims description 11
- 235000012054 meals Nutrition 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 7
- 238000005516 engineering processes Methods 0.000 abstract description 7
- 238000007599 discharging Methods 0.000 abstract description 2
- 229910002089 NOx Inorganic materials 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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[C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
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[O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reactions Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000001276 controlling effects Effects 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 238000010586 diagrams Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000004744 fabrics Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000003546 flue gases Substances 0.000 description 1
- 238000005755 formation reactions Methods 0.000 description 1
- 239000002737 fuel gases Substances 0.000 description 1
- 239000008187 granular materials Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000001939 inductive effects Effects 0.000 description 1
- 230000002045 lasting Effects 0.000 description 1
- 239000010410 layers Substances 0.000 description 1
- 230000004301 light adaptation Effects 0.000 description 1
- 238000000034 methods Methods 0.000 description 1
- 239000000203 mixtures Substances 0.000 description 1
- 230000001706 oxygenating Effects 0.000 description 1
- 230000003134 recirculating Effects 0.000 description 1
- 239000007787 solids Substances 0.000 description 1
- 230000001550 time effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
- F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
Abstract
Description
Technical field
The present invention relates to a kind of end being applicable to significantly load adjustment puts low NO, belongs to coal burning system technology neck Territory.
Background technology
In actual moving process, all there are the feelings of high underrun in industrial boilers in China and middle-size and small-size heating boiler Condition, particularly Industrial Boiler, need to adjust constantly boiler load according to commercial production change, it is ensured that its heat energy supply does not exceeds standard.
The industry coal-boiler system of China is less at the subject range of load, typically at the load of 50%-80% at present Adjusting range.Production unit is reduced because of volume of production, is frequently present of boiler Ultra-low load operation, the measure that at this moment boiler is taked Generally frequent start and stop boiler, or banking fire runs (chain furnace).The frequent start-stop of boiler can cause boiler energy consumption to be greatly increased, Emissions data is unstable, the service life of reduction equipment.Therefore the burner that exploitation is applicable to Load Regulation on a large scale has significantly Economic benefit and environmental benefit.
Currently available technology is, coal-burning boiler is when underload, and the outlet size of burner is fixing, lowers coal dust amount Needing to reduce accordingly air flow rate proportioning, during underload, each air channel speed corresponding all can reduce, and can cause the coal dust of spiral-flow type Burner, because swirl strength is not enough, causes coal dust to burn rate variance, and easily forms localized hyperthermia, cause NOx significantly to generate.High During load operation, because burner outlet wind speed is fast, swirl strength is big, and it is too high that high temperature gases recirculating forms flame of centre temperature, holds Easily cause coking and the problem such as heating power nitrogen is uncontrollable, NOx emission exceeds standard.
In consideration of it, the present inventor carries out in-depth study to the problems referred to above, this case is then had to produce.
Summary of the invention
It is an object of the invention to provide a kind of boiler that can improve and tackle the adaptation ability of load adjustment, energy-efficient, ring Protect, low NO is put at the end being applicable to significantly load adjustment of simple structure.
In order to achieve the above object, the present invention uses such technical scheme:
Low NO is put at a kind of end being applicable to significantly load adjustment, including the central flame being nested with the most successively Flame regulation pipe, primary air piping, secondary air channel and three auxiliary combustion equipments, the import of primary air piping is provided with coal dust flow-stabilizing mechanism, and one The outlet of secondary airduct is provided with First air cyclone, and the import of secondary air channel is provided with air premixing appts, and the outlet of secondary air channel sets Having secondary wind cyclone, the outlet of secondary air channel is additionally provided with steady flame device, and the air outlet of three auxiliary combustion equipments is with steady flame device even Logical.
As a kind of optimal way of the present invention, described steady flame device includes the first wide diameter portion in cone cylinder shape, and first expands Two ends vertically, footpath portion are set to the first end and the second end, the inwall of the first end of the first wide diameter portion and described secondary air channel Linking, the first wide diameter portion is gradually increased to the second end internal diameter from the first end.
As a kind of optimal way of the present invention, the inwall of described first wide diameter portion and the angle of horizontal plane are 40 °-60 °.
As a kind of optimal way of the present invention, described steady flame device also includes the second wide diameter portion in cone cylinder shape, second Wide diameter portion two ends vertically are set to the 3rd end and the 4th end, the 3rd end of the second wide diameter portion and described first wide diameter portion Second end linking, the second wide diameter portion is gradually increased to the 4th end internal diameter from the 3rd end.
As a kind of optimal way of the present invention, the outlet of described three auxiliary combustion equipments is from the outer wall of described second wide diameter portion It is through to inwall.
As a kind of optimal way of the present invention, described air premixing appts includes secondary fresh wind passage and secondary back Wind passage, the outlet of secondary fresh wind passage all connects with described secondary air channel with the outlet of secondary back wind passage.
As a kind of optimal way of the present invention, the import of described three auxiliary combustion equipments is provided with three fresh wind passages and three Secondary backflow wind passage, the outlet of the outlet of three fresh wind passages and three backflow wind passages is all with described three auxiliary combustion equipments even Logical.
As a kind of optimal way of the present invention, described coal dust flow-stabilizing mechanism has spherical inner chamber, and spherical interior intracavity is provided with Stabilier, this spherical inner chamber is provided with powder inlet and meal outlet, and powder inlet connects with coal dust feeding mechanism, meal outlet with described once Airduct connects.
As a kind of optimal way of the present invention, in described steady flame device, it is provided with temperature sensor.
As a kind of optimal way of the present invention, described steady flame device is provided with flame-observing hole.
Use technical scheme, coal dust flow-stabilizing mechanism coal dust in powder feeding pipes of equilibrium, it is ensured that coal After powder ejection, in burner hearth, concentration distribution is more average, solves the problems such as flame bias, and First air cyclone is used for making First air Formation eddy flow, allows the high-temperature flue gas after burning form backflow by the effect of eddy flow central negative pressure, and ignite follow-up coal dust, stablizes and fires Burn;Secondary wind cyclone is used for making secondary wind form eddy flow, and First air cyclone is with turning to, and rises and extends the coal dust firing time Effect, can be passed through fresh air and backflow wind by air premixing appts, and be sufficiently mixed, make the gas of entrance burner Oxygen amount is stable, it is provided that the suppression that NOx is generated by the stability of burning and offer controls, and flame of centre regulation pipe can be passed through backflow wind Or fresh air, is used for regulating burner flame central negative pressure, controls the length of flame;Steady flame device has absorption also accumulation of heat Function, and provide stable heat radiation, the stability of flame when being greatly improved underload, it is ensured that coal dust quilt smoothly for flame root Ignite;Three auxiliary combustion equipments provide high speed combustion-supporting gases, provide combustion air for burning, the present invention reasonable Arrangement by structure, Fractional combustion can be realized, be greatly improved the load regulation range of burner, improve the adaptability to industrial different operating modes, use Low-NO_x combustion technology, the initial ejection index of its burner be far below national regulation concentration of emission, reach energy-efficient, reduce discharging and The beneficial effect of environmental protection.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention;
In figure:
1-primary air piping 11-coal dust flow-stabilizing mechanism
12-First air cyclone 2-secondary air channel
Bis-fresh wind passage 22-secondary back wind passages of 21-
23-tri-auxiliary combustion equipments of secondary wind cyclone 3-
Tri-backflow wind passages of tri-fresh wind passage 32-of 31-
4-steady flame device 41-temperature sensor
42-flame-observing hole 43-the first wide diameter portion
44-the second wide diameter portion 5-flame of centre regulation pipe
Detailed description of the invention
In order to technical scheme is explained further, it is described in detail below in conjunction with the accompanying drawings.
With reference to Fig. 1, low NO is put at a kind of end being applicable to significantly load adjustment, including being nested with the most successively Flame of centre regulation pipe 5, primary air piping 1, secondary air channel 2 and three auxiliary combustion equipments 3, the import of primary air piping 1 is provided with coal Powder flow-stabilizing mechanism 11, the outlet of primary air piping 1 is provided with First air cyclone 12, and the import of secondary air channel 2 is provided with air pre-mixing dress Putting, the outlet of secondary air channel 2 is provided with secondary wind cyclone 23, and the outlet of secondary air channel 2 is additionally provided with steady flame device 4, and three times combustion-supporting The air outlet of device 3 connects with steady flame device 4.Wherein, flame of centre regulation pipe 5 is positioned at burner axis center, this regulation Pipe can be passed through backflow wind or fresh air, is used for regulating burner flame central negative pressure, controls the length of flame.
As a kind of optimal way of the present invention, described steady flame device 4 includes the first wide diameter portion 43 in cone cylinder shape, first Wide diameter portion 43 two ends vertically are set to the first end and the second end, the inwall of the first end of the first wide diameter portion 43 and described two The linking of secondary airduct 2, the first wide diameter portion 43 is gradually increased to the second end internal diameter from the first end.
As a kind of optimal way of the present invention, the inwall of described first wide diameter portion 43 and the angle of horizontal plane are (i.e. in figure Angle A) it is 40 °-60 °.
As a kind of optimal way of the present invention, described steady flame device 4 also includes the second wide diameter portion 44 in cone cylinder shape, the One wide diameter portion 43 and the second wide diameter portion 44 are structure as a whole, and the second wide diameter portion 44 two ends vertically are set to the 3rd end and Four ends, the 3rd end of the second wide diameter portion 44 is connected with the second end of described first wide diameter portion 43, and the second wide diameter portion 44 is from the 3rd end It is gradually increased to the 4th end internal diameter.
As a kind of optimal way of the present invention, described air premixing appts includes secondary fresh wind passage 21 and secondary returning Stream wind passage 22, the outlet of secondary fresh wind passage 21 and the outlet of secondary back wind passage 22 are all with described secondary air channel 2 even Logical.Fresh air and backflow wind enter from secondary fresh wind passage 21 and secondary back wind passage 22 and fully mix respectively Closing, the gas oxygen amount making entrance burner is stable, it is provided that the suppression that NOx is generated by the stability of burning and offer controls.
As a kind of optimal way of the present invention, the import of described three auxiliary combustion equipments 3 is provided with three fresh wind passages 31 With three times backflow wind passages 32, three fresh wind passages 31 outlet and three times backflow wind passages 32 outlet all with described three times Auxiliary combustion equipment 3 connects.As a kind of optimal way of the present invention, the outlet (i.e. spout) of described three auxiliary combustion equipments 3 is from described The outer wall of the second wide diameter portion 44 is through to inwall.Using this structure, burner uses classification air feed Technology design, part wind Amount is assigned to outside flame-stabilizing area, makes the lack of air of flame-stabilizing area, and coal dust the most fully burns, and then coal dust is in ejection flame-stabilizing area After, helped wind that coal dust carries out secondary oxygenating burning by three times.
As a kind of optimal way of the present invention, described coal dust flow-stabilizing mechanism 11 has spherical inner chamber, and spherical interior intracavity can Being further provided with stabilier (not shown), this spherical inner chamber is provided with powder inlet and meal outlet, and powder inlet fills with coal dust supply Putting connection, meal outlet connects with described primary air piping 1.Using this structure, air-flow discharges in spherical inner chamber, solid particle Speed can be faster than air velocity, is formed at spherical interior intracavity and puddles, plays the effect of the most even current stabilization.
As a kind of optimal way of the present invention, in described steady flame device 4, it is provided with temperature sensor 41.
As a kind of optimal way of the present invention, described steady flame device 4 is provided with flame-observing hole 42.
After using technical scheme, primary air piping 1 is for burner for powder passage, and coal dust is delivered into by pipeline After burner, through coal dust flow-stabilizing mechanism 11, coal dust is broken up again, make coal powder density equiblibrium mass distribution in circulating line, coal dust After First air cyclone 12, form eddy flow.Wind needed for burning is carried out hierarchical arrangement by present invention design, the wind of secondary wind Amount when being not enough to meet heavy-duty service coal dust complete burning, therefore when underrun, secondary air flow less in the case of, Secondary wind, after secondary wind cyclone 23 eddy flow, has the swirl strength met needed for burning, is configured steady flame device 4, tool Have and absorb and the function of accumulation of heat, and provide stable heat radiation for flame root, the stability of flame when being greatly improved underload, Guarantee that coal dust is ignited smoothly.Introduce FGR technology, introduce the fresh wind of secondary 21 and secondary back wind respectively at secondary air channel 2 22, by the control to secondary oxygen amount, control the combustion intensity in steady flame device 4, by temperature sensor 41 and sight fire Hole 42 can control the combustion intensity in steady flame device 4 the most intuitively, and control temperature, at 950 DEG C, can meet the abundant of coal dust Light, it is possible to realize low nitrogen burning, reduce the discharge of NOx, thus realize the stable burning under ultra-low load state.
During burner heavy-duty service, a large amount of coal dusts enter flame-stabilizing area by primary air piping 1, fresh by regulation secondary wind Wind 21 and the proportioning of secondary back wind 22, regulate the flame intensity in steady flame device 4, it is to avoid localized hyperthermia occur, and coal dust is surely Carry out primary combustion in flame device 4, and provided lasting heat radiation by steady flame device 4, for being risen by a large amount of secondary wind high-speed rotational Coal dust provide and stablize thermal source, controlling temperature in steady flame device 4 is 1000 DEG C, and in the environment of 1000 DEG C, coal dust fugitive constituent is abundant Release, then spray high speed combustion-supporting gas from the spout of tertiary air auxiliary combustion equipment 3, volatilization fuel gas fills outside burner outlet Divided combustion, remaining carbon granule, after burner stable flame device 4 and burner outlet fugitive constituent combustion zone, the most all draws Combustion, because burner is to put layout in the end, vertically upward sprays coal dust, and burner hearth position tiny structure runs, and pulverized coal particle can be at gravity Form superposed layer with under the common effect of air inducing gravitation, the coal dust burnt because of after burning weight and be sucked out burner hearth, this cloth Put and substantially increase the burnout rate of coal dust with structure, and achieve the effect of multistage air-supply and multistage combustion, be substantially reduced NOx's Generate, the control to oxygen amount in conjunction with burner secondary air channel 2 and tertiary air auxiliary combustion equipment 3, and the application of backflow wind, utilize nitrogen Reduction reaction, reduces the discharge capacity of NOx, it is achieved low nitrogen and efficient function further.The reduction reaction following reaction equation institute of nitrogen Show:
2NO+C=CO2+N2;
2NO2+ 2C=2CO2+N2;
To sum up, the present invention is by a series of technological innovation and structure of modification, after being matched in boiler, it is achieved going out of burner Power adjusting range reaches 25-105%, is greatly improved the load performance of boiler, and realizes the low nitrogen burning of high underload, In the case of without adding any additive, the source discharge data of burner NOx can control at 150mg/Nm3Hereinafter, And stablize burning.
The present invention is designed by innovation structure, uses the concept that separates with stove of pot, steady flame device be the equal of one little Stove, is equivalent to a burner outlet removal burner hearth part, and the flame of burner ejection first fires in this port of steady flame device Burn, then in spirt burner hearth, so the purpose of design is to realize Ultra-low load operation, because steady flame device space is little, low negative The when that lotus flame being little, steady flame device plays the effect of protection.During heavy-duty service, steady flame device can help to realize classification combustion Burn, thus realize low nitrogen burning.
The product form of the present invention is not limited to this case diagram and embodiment, and anyone carries out the suitable of similar thinking to it Change or modification, all should be regarded as the patent category without departing from the present invention.
Claims (10)
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ZA2017/02107A ZA201702107B (en) | 2016-08-31 | 2017-03-27 | Base-located low nox burner applicable to large load adjustment |
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CN106196044B (en) | 2019-01-15 |
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