CN103672867B - A kind of overfire air device of W typed flame boiler and method of high-efficiency low-pollution - Google Patents
A kind of overfire air device of W typed flame boiler and method of high-efficiency low-pollution Download PDFInfo
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- CN103672867B CN103672867B CN201310619621.3A CN201310619621A CN103672867B CN 103672867 B CN103672867 B CN 103672867B CN 201310619621 A CN201310619621 A CN 201310619621A CN 103672867 B CN103672867 B CN 103672867B
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Abstract
The present invention relates to a kind of overfire air device of W typed flame boiler and method of high-efficiency low-pollution.Existing Large Copacity W type flame boiler combustion exhausted wind equipment has large, the complex structure that takes up space.Combustion exhausted wind apparatus of the present invention comprises primary zone fire air nozzle, aileron fire air nozzle, upper furnace, annular passage and is provided with the bellows of after-flame stratification of wind, be characterized in: one end of primary zone fire air nozzle is fixed on the water-cooling wall at the nearly aditus laryngis place of upper furnace, the other end is fixed on bellows, one end of aileron fire air nozzle is connected on annular passage by pipeline, and the other end is connected to upper furnace on the water-cooling wall at side wall place; Fire air nozzle includes air channel, center, outer shroud air channel and cyclone, and air channel, described center is arranged in outer shroud air channel.The feature of burnout degree method of the present invention is: send into burnout degree to fire air nozzle, this after-flame air quantity accounts for the 10%-25% into stove total blast volume.Structure of the present invention is simple, and guarantee burnout degree fully mixes with main flume.
Description
Technical field
The present invention relates to a kind of combustion exhausted wind apparatus and method, especially relate to a kind of overfire air device of W typed flame boiler and method of high-efficiency low-pollution.
Background technology
W type flame boiler has following significant technical characterstic in burning: 1. time of stopping in stove of pulverized coal particle is long; 2. fire box temperature level is high, improves fire environment, enhanced burning stability.Be aided with technical measures such as laying wall with refractory lining, refracto, be conducive to the after-flame of stable and fuel of the catching fire of low-volatile fuel, flame.But, due to temperature levels higher in W type flame boiler furnace, result in larger NOx generation amount, and start on July 1st, 2014 in " fossil-fuel power plant atmospheric pollutant emission standard " (the GB13223 – 2011) performed, for W type flame boiler NO
x the highest permission concentration of emission is 200mg/m
3(folding 6%O
2).
Installing combustion exhausted wind apparatus additional on W type flame boiler furnace top is a kind of wherein method reducing emission of NOx of boiler level, domestic existing part research: (China Patent No. is ZL200410060622.X as patent of invention " overfire air device of W typed flame boiler and method ", authorized announcement date is on January 17th, 2007, Authorization Notice No. is CN1295460C, call in the following text " file one "), (China Patent No. is ZL200620020919.8 to utility model patent " a kind of W type flame furnace of low-NOx coal powder ", authorized announcement date is on May 30th, 2007, Authorization Notice No. is CN2906360Y, call in the following text " file two ") all propose, W type flame boiler increases combustion exhausted wind apparatus, the oxygen amount of lower hearth can be reduced, make it to be in reducing atmosphere, and reduce the temperature levels in lower hearth primary zone, thus reduce NOx.But, the version of what the fire air nozzle of above-mentioned two patents adopted is all direct current, although this version can make burnout degree jet have stronger momentum, darker along the incidence of furnace depth direction, but the lateral diffusion-capability of jet is more weak, cannot mix with the flue gas between adjacent jets and coal dust, cause the after-flame degree of this part coal dust to be deteriorated, unburned carbon in flue dust is higher, and grey phosphorus content is higher by the economic well-being of workers and staff reducing boiler thermal output, increase the coal consumption of power plant, reduce power plant.
And for example patent of invention " a kind of complete mixing W type flame boiler combustion exhausted wind apparatus " (China Patent No. is ZL200810064934.6, authorized announcement date be June 23, Authorization Notice No. in 2010 is 101324339B, calls in the following text " file three ") although arrange the fire air nozzle comprising internal layer air channel, outer air channel, swirl vane equally on upper furnace two side.But downward-sloping 30 degree of spout, following problem can be caused: the spout that (1) tilts and connecting pipe bulky thereof, and fire air nozzle present position is also the region that bellows, buckstay and leveling apparatus are intensive, difficulty is brought to the detail design of combustion exhausted wind apparatus and installation; (2) fire air nozzle is downward-sloping, is that the mixing point of burnout degree jet and main flume is positioned at lower hearth, affects the formation in lower hearth " W " type dual reflux district, is unfavorable for burning tissues, and oxygen-depleted zone scope in stove is reduced.In addition, the burnout degree that " file three " proposes accounts for 25% ~ 30% of total blast volume, can have a strong impact on boiler combustion performance, and the combustion stability being mainly reflected in boiler is poor, and furnace pressure fluctuation is large, and easily put out a fire, unburned carbon in flue dust sharply raises, degradation under boiler combustion efficiency.In addition, do not relate to the arrangement of interior direct current contour stealth fire air nozzle direction of rotation combination, do not provide swirler blades angle, do not provide the layout of device-dependent bellows and pipeline with burnout degree yet.
For another example (application number is 201310224328.7 to patent of invention " being furnished with the W type flame boiler of clearance type fire air nozzle on chimney arch ", the applying date is on June 7th, 2013, publication number is CN103292318A, call in the following text " file four ") propose to arrange clearance type combustion exhausted wind apparatus above aileron on W type flame boiler arch, but according to numerical simulation result, the spout outlet momentum of impinging jet decay of clearance type is very fast, weak to the penetration capacity of main flume, and jumbo W flame boiler size is larger, distance between upper furnace front-back wall is very large, if fire air nozzle is arranged in arch owing to will avoid the structures such as water-cooling wall bend pipe at a distance of farther, jet is difficult to be formed closed to main flow air-flow.And " file four " does not relate to the air quantity of aileron burnout degree.
In sum, existing Large Copacity (more than 600MW) W type flame boiler combustion exhausted wind equipment has large, the complex structure of taking up space, cannot take into account the incident degree of depth and lateral diffusion-capability, do not affect tissue burn in primary zone cannot ensure burnout degree and main flume well-mixed while, causes detail design and installs the problems such as inconvenience, reduction boiler thermal output, the coal consumption of increase power plant.
Summary of the invention
The object of the invention is to solve that existing Large Copacity (more than 600MW) W type flame boiler combustion exhausted wind equipment takes up space greatly, complex structure, the incident degree of depth and lateral diffusion-capability cannot be taken into account, do not affect the tissue burnt in primary zone burnout degree and main flume well-mixed cannot be ensured while, cause detail design and the problems such as inconvenience, reduction boiler thermal output, the coal consumption of increase power plant are installed, and a kind of overfire air device of W typed flame boiler and method of high-efficiency low-pollution is provided.
The present invention's adopted technical scheme that solves the problem is: the W type flame boiler combustion exhausted wind apparatus of this high-efficiency low-pollution comprises primary zone fire air nozzle, aileron fire air nozzle, chimney arch, lower hearth, upper furnace, annular passage and is provided with the bellows of after-flame stratification of wind, described bellows are positioned at the top of chimney arch, and close to the aditus laryngis of W type flame boiler; Its design feature is: one end of described primary zone fire air nozzle is fixed on the water-cooling wall at the nearly aditus laryngis place of upper furnace, the other end is fixed on bellows, for being communicated with after-flame stratification of wind in bellows and burner hearth, after-flame stratification of wind in bellows is primary zone fire air nozzle air feed, and air force is regulated by wind-box damper and executing agency thereof; One end of described aileron fire air nozzle is connected on annular passage by pipeline, and the other end is connected to upper furnace on the water-cooling wall at side wall place; Described after-flame stratification of wind, primary zone fire air nozzle and aileron fire air nozzle are positioned at same level height, the axis of described primary zone fire air nozzle and aileron fire air nozzle is all horizontal, this primary zone fire air nozzle and aileron fire air nozzle include air channel, center, outer shroud air channel and cyclone, air channel, described center is arranged in outer shroud air channel, described cyclone is arranged in outer shroud air channel, and the blade angle of this cyclone is 25-35 degree.Make structure of the present invention simple thus, reduce construction cost and difficulty.Because the combustion exhausted wind apparatus volume of W type flame boiler of the present invention is little, the front-back wall of upper furnace can be installed near throat location (with bellows after-flame stratification of wind same level position), both distance furnace outlet was far away, uncompleted burned carbon in guarantee flying dust and burnout degree have the sufficient reaction time, the unlikely tissue affecting flow field, lower hearth " W " dual reflux district again.The axis of primary zone fire air nozzle and aileron district fire air nozzle is level, is also the tissue for avoiding affecting flow field, lower hearth " W " dual reflux district.Fire air nozzle is divided into primary zone fire air nozzle and aileron fire air nozzle two kinds, primary zone fire air nozzle and arch burner one_to_one corresponding, aileron fire air nozzle mainly adopts 8 corner structures for W type flame boiler lower hearth, the burner distance side wall at edge has the distance of more than 2.5 meters, considerably beyond the distance 1.5 ~ 1.75m between two burners, because burner hearth central area flue-gas temperature is higher than close both walls place flue-gas temperature, flow expansion makes the trend of the oriented side wall flowing of burner hearth central area air-flow, if do not arrange aileron fire air nozzle, easily " smoke corridor " is formed near side wall, a large amount of main flume just enters Ping Qu without mixing with burnout degree, the excess air coefficient making sidewall section corresponding is low, be in oxygen deprivation state, unburned combustible in fly ash is raised, flue gas herein cools without burnout degree, bring side water wall face overtemperature, the bad working environments such as slagging scorification.And the present invention arranges aileron fire air nozzle can solve the problem.The blade angle of cyclone gets 25-35 degree, can effectively take into account the incident degree of depth and lateral diffusion-capability, can improve boiler thermal output, reduce power plant's coal consumption.
As preferably, the direction of rotation of primary zone of the present invention fire air nozzle and the direction of rotation of aileron fire air nozzle are arranged symmetrically between the left side wall and right-side wall of upper furnace, when sight line is observed along spout incident direction, the direction of rotation of the spout of side to the left is counterclockwise, and the direction of rotation of the spout of side to the right is clockwise.This arrangement mode of the present invention makes the flue gas trend that oriented burner hearth center is gathered in burnout degree bottom, cut down because burner hearth central area temperature is high, flue gas, to the trend of side wall movement, is conducive to the flue gas that lower hearth is in oxygen deprivation state and mixes with burnout degree more fully.And the high-temperature flue gas adding rear hearth center at burnout degree moves to side wall along eddy flow direction, reduce screen district's flue gas flow rate deviation and gas temperature windage, be conducive to the safe and stable operation of boiler.
As preferably, the pipeline of connection aileron fire air nozzle of the present invention is provided with butterfly valve.Make the present invention can regulate separately the flow of each aileron fire air nozzle thus, realize the flexible control of burning.
As preferably, the position of cyclone of the present invention can regulate along the axial direction in outer shroud air channel, to reach the object adjusted the swirl strength of burnout degree jet.
A kind of burnout degree method using combustion exhausted wind apparatus, its feature is: send into burnout degree to described primary zone fire air nozzle and aileron fire air nozzle, this after-flame air quantity accounts for the 10%-25% into stove total blast volume, and the air quantity of single aileron fire air nozzle is the 1/2-2/3 of the air quantity of single primary zone fire air nozzle.Analog result draws, when the air quantity getting single aileron district fire air nozzle is 1/2 ~ 2/3 of single primary zone fire air nozzle air quantity, " smoke corridor " phenomenon near side wall can be eliminated, and evenly along the oxygen distribution in furnace chamber width, make the excess air coefficient near center and side wall be in same level.
As preferably, in the fire air nozzle of primary zone of the present invention, the air quantity in air channel, described center be the 1-1.5 of the air quantity in outer shroud air channel doubly; In described aileron fire air nozzle, the air quantity in air channel, described center is 1-1.5 times of the air quantity in outer shroud air channel.Make the present invention can mate axial momentum and the swirl strength of fire air nozzle thus, take into account the lateral diffusion-capability of swirl strength along the transmission in incident direction and burnout degree jet.
As preferably, the wind speed in the air channel, center in primary zone of the present invention fire air nozzle and aileron fire air nozzle is 40-55m/s.Make the present invention can strengthen burnout degree jet rigidity thus, ensure jet penetrating main flume.
As preferably, the wind speed in the outer shroud air channel in primary zone of the present invention fire air nozzle and aileron fire air nozzle is 35-45m/s.The present invention is made to make burnout degree jet have better swirl strength thus, the axial momentum of this swirl strength and main flume matches, take into account the lateral diffusion-capability of swirl strength along the transmission in incident direction and burnout degree jet, so, under the effect of this outward turning flow and inner direct flow fire air nozzle, after-flame wind energy fully mixes with flue gas up from lower hearth.
As preferably, combustion exhausted wind apparatus of the present invention is in running, and the air quantity in air channel, described center is definite value with the ratio of the air quantity in outer shroud air channel.Make the present invention can ensure under arbitrary load thus, the penetrate effect of fire air nozzle jet to main flume is consistent.
The present invention compared with prior art, has the following advantages and effect: the structure of the combustion exhausted wind apparatus of (1) W type flame boiler is simple, reduces construction cost and difficulty.Because the combustion exhausted wind apparatus volume of W type flame boiler is little, the front-back wall of upper furnace can be installed near throat location (with bellows after-flame stratification of wind same level position), both distance furnace outlet was far away, uncompleted burned carbon in guarantee flying dust and burnout degree have the sufficient reaction time, the unlikely tissue affecting flow field, lower hearth " W " dual reflux district again.The axis of primary zone fire air nozzle and aileron district fire air nozzle is level, is also the tissue for avoiding affecting flow field, lower hearth " W " dual reflux district.
(2) fire air nozzle is divided into primary zone fire air nozzle and aileron fire air nozzle two kinds, primary zone fire air nozzle and arch burner one_to_one corresponding, aileron fire air nozzle mainly adopts 8 corner structures for W type flame boiler lower hearth, the burner distance side wall at edge has the distance of more than 2.5 meters, considerably beyond the distance 1.5 ~ 1.75m between two burners, because burner hearth central area flue-gas temperature is higher than close both walls place flue-gas temperature, flow expansion makes the trend of the oriented side wall flowing of burner hearth central area air-flow, if do not arrange aileron fire air nozzle, easily " smoke corridor " is formed near side wall, a large amount of main flume just enters Ping Qu without mixing with burnout degree, the excess air coefficient making sidewall section corresponding is low, be in oxygen deprivation state, unburned combustible in fly ash is raised.Flue gas herein cools without burnout degree, brings the bad working environments such as side water wall face overtemperature, slagging scorification.And aileron fire air nozzle is set can solves the problem.Draw according to analog result, when the air quantity getting single aileron district fire air nozzle is 1/2 ~ 2/3 of single primary zone fire air nozzle air quantity, the generation of " smoke corridor " can be eliminated, and evenly along the oxygen distribution in furnace chamber width, make the excess air coefficient near center and side wall be in same level.
(3) direct current contour stealth design in primary zone fire air nozzle and aileron district fire air nozzle.The air quantity in air channel, center is comparatively large, maintain the ratio 1:1 ~ 1.5:1 designed and pass into burner hearth, and wind speed is between 40 ~ 55m/s with the air quantity in outer shroud air channel, and jet rigidity is comparatively strong, ensures jet penetrating main flume; Another strand of wind enters outer shroud air channel, via the cyclone of fixed angle, air outlet velocity is at 35 ~ 45m/s, and there is certain spin intensity, the axial momentum of this spin intensity and main flume matches, and takes into account the lateral diffusion-capability of swirl strength along the transmission in incident direction and burnout degree jet, so, under the effect of this outward turning flow and inner direct flow fire air nozzle, after-flame wind energy fully mixes with flue gas up from lower hearth.Between the angular configurations 25 degree ~ 35 degree of cyclone camber blades, concrete value is determined depending on the actual range between furnace depth fire air nozzle adjacent with two.Cyclone position in outer shroud air channel can regulate along the axial direction of fire air nozzle, can adjust swirl strength.
(4) primary zone fire air nozzle and aileron fire air nozzle direction of rotation are arranged symmetrically with between the side wall of upper furnace left and right, on the left of front wall, spout is for being rotated counterclockwise, on the right side of front wall, spout is for turning clockwise, and on the left of rear wall, spout is for being rotated counterclockwise, and on the right side of rear wall, spout is clockwise.This arrangement mode obtains the flue gas trend that oriented burner hearth center is gathered in burnout degree bottom, cuts down because burner hearth central area temperature is high, and flue gas, to the trend of side wall movement, is conducive to the flue gas that lower hearth is in oxygen deprivation state and mixes with burnout degree more fully.And the high-temperature flue gas adding rear hearth center at burnout degree moves to side wall along eddy flow direction, reduce screen district's flue gas flow rate deviation and gas temperature windage, be conducive to the safe and stable operation of boiler.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram after the W type flame boiler combustion exhausted wind apparatus removal bellows of high-efficiency low-pollution in the embodiment of the present invention.
Fig. 2 is the structural representation after the W type flame boiler combustion exhausted wind apparatus vertical profile of high-efficiency low-pollution in the embodiment of the present invention.
Fig. 3 is the fragmentary top TV structure schematic diagram of Fig. 1.
Fig. 4 is the right TV structure schematic diagram of Fig. 1.
Fig. 5 is the structural representation that the W type flame boiler combustion exhausted wind apparatus of high-efficiency low-pollution in the embodiment of the present invention forms " smoke corridor " when being unkitted aileron fire air nozzle.
Fig. 6 is the structural representation of fire air nozzle in the embodiment of the present invention.
Fig. 7 is the right TV structure schematic diagram of Fig. 6.
Fig. 8 is the perspective view of fire air nozzle in the embodiment of the present invention.
Fig. 9 is the structural representation of the blade on the cyclone in the embodiment of the present invention in fire air nozzle.
Figure 10 is the plan structure schematic diagram of Fig. 9.
Figure 11 is the situation of change schematic diagram of different swirler blades angle spout axial momentum along the incident degree of depth.
Figure 12 is the situation of change schematic diagram of the different swirler blades angle nozzle outlet rotary moment of momentum along the incident degree of depth.
In figure: primary zone fire air nozzle 1, aileron fire air nozzle 2, chimney arch 3, lower hearth 4, upper furnace 5, burnout degree baffle plate and executing agency 6 thereof, bellows 7 containing after-flame stratification of wind, bellows after-flame stratification of wind 8, seal box 9, bellows secondary stratification of wind 10, secondary air damper and executing agency 11 thereof, annular passage 12, butterfly valve 13, pipeline 14, coal dust spout 15, left side wall 16, right-side wall 17, air channel, center 18, outer shroud air channel 19, cyclone 20.
Detailed description of the invention
Below in conjunction with accompanying drawing, also by embodiment, the present invention is described in further detail, and following examples are explanation of the invention and the present invention is not limited to following examples.
Embodiment.
See Fig. 1 to Figure 12, the W type flame boiler combustion exhausted wind apparatus of the high-efficiency low-pollution in the present embodiment comprises primary zone fire air nozzle 1, aileron fire air nozzle 2, chimney arch 3, lower hearth 4, upper furnace 5, burnout degree baffle plate and executing agency 6, the bellows 7 being provided with after-flame stratification of wind, secondary air damper and executing agency 11, annular passage 12, butterfly valve 13 and pipeline 14.Bellows 7 in the present embodiment are positioned at the top of chimney arch 3, and close to the aditus laryngis of W type flame boiler; Lower hearth 4 is positioned at the below of upper furnace 5.
One end of primary zone fire air nozzle 1 in the present embodiment is fixed on the water-cooling wall at the nearly aditus laryngis place of upper furnace 5, the other end is fixed on bellows 7, for being communicated with after-flame stratification of wind 8 in bellows 7 and burner hearth, after-flame stratification of wind 8 is primary zone fire air nozzle 1 air feed, and air force is regulated by burnout degree baffle plate and executing agency 6 thereof.
One end of aileron fire air nozzle 2 in the present embodiment is connected on annular passage 12 by pipeline 14, butterfly valve 13 is arranged on the pipeline 14 of connection aileron fire air nozzle 2, air quantity is regulated by butterfly valve 13, and the other end is connected to upper furnace 5 on the water-cooling wall at side wall place.
After-flame stratification of wind 8 in the present embodiment, primary zone fire air nozzle 1 and aileron fire air nozzle 2 are positioned at same level height, and the axis of primary zone fire air nozzle 1 and aileron fire air nozzle 2 is all horizontal.Primary zone fire air nozzle 1 in the present embodiment and aileron fire air nozzle 2 include air channel, center 18, outer shroud air channel 19 and cyclone 20, wherein, air channel, center 18 is arranged in outer shroud air channel 19, cyclone 20 is arranged in outer shroud air channel 19, the angle [alpha] of the blade of this cyclone 20 is 25-35 degree, concrete value is determined depending on the actual range between furnace depth fire air nozzle adjacent with two, cyclone 20 position in outer shroud air channel 19 in axial direction can regulate, and can adjust swirl strength.
The direction of rotation of the primary zone fire air nozzle 1 in the present embodiment and the direction of rotation of aileron fire air nozzle 2 are arranged symmetrically between the left side wall 16 and right-side wall 17 of upper furnace 5, when sight line is observed along spout incident direction, the direction of rotation of the spout of side to the left is counterclockwise, and the direction of rotation of the spout of side to the right is clockwise.
The W type flame boiler combustion exhausted wind method of the high-efficiency low-pollution in the present embodiment is as follows: send into burnout degree to primary zone fire air nozzle 1 and aileron fire air nozzle 2, this after-flame air quantity accounts for the 10%-25% into stove total blast volume, and the air quantity of single aileron fire air nozzle 2 is 1/2-2/3 of the air quantity of single primary zone fire air nozzle 1.In primary zone fire air nozzle 1, the air quantity in air channel, center 18 is 1-1.5 times of the air quantity in outer shroud air channel 19; In aileron fire air nozzle 2, the air quantity in air channel, center 18 is 1-1.5 times of the air quantity in outer shroud air channel 19.Wind speed in air channel, center 18 in primary zone fire air nozzle 1 and aileron fire air nozzle 2 is 40-55m/s.The wind speed in the outer shroud air channel 19 in primary zone fire air nozzle 1 and aileron fire air nozzle 2 is 35-45m/s.Under normal circumstances, combustion exhausted wind apparatus of the present invention is in running, and the air quantity in air channel, center 18 is preferably definite value with the ratio of the air quantity in outer shroud air channel 19.
Bellows secondary stratification of wind 10 can be set in bellows 7 of the present invention, and air force can be controlled by secondary air damper and executing agency 11 thereof.Arrange after-flame stratification of wind 8 in bellows 7 of the present invention, this after-flame stratification of wind 8 and primary zone fire air nozzle 1 and aileron fire air nozzle 2 same level height, for being primary zone fire air nozzle 1 air feed.One end of primary zone fire air nozzle 1 in the present invention can be fixed on the water-cooling wall at the nearly aditus laryngis place of upper furnace 5 by seal box 9, and the other end of aileron fire air nozzle 2 also can be connected to upper furnace 5 on the water-cooling wall at side wall place by seal box 9.Fire air nozzle in the present invention is divided into primary zone fire air nozzle 1 and aileron fire air nozzle 2 two kinds, and extraneous coal dust spout 15 belongs to prior art with annexation of the present invention.
The present invention enters burner hearth burnout degree jet through air channel, center 18 has larger axial momentum, burnout degree jet through outer shroud air channel 19 forms eddy flow under the guiding of the cyclone 20 of certain angle, there is suitable spin intensity, thus there is certain lateral diffusion-capability, jet is enable to cover region between adjacent two fire air nozzle, to ensure that flue gas fully mixes.
A primary zone fire air nozzle 600MW being used to anthracitic W type flame boiler does Modelling Test and numerical simulation; when drawing the pressure of bellows 1000Pa, after-flame wind-warm syndrome 615K; primary zone fire air nozzle 1 axial momentum of the blade angle of different cyclone 20 and spinning momentum square are along the distribution on incident depth direction, and difference as is illustrated by figs. 11 and 12.The result of Figure 11 shows: the burnout degree jet liquidated levels off to zero, in stagnation state at burner hearth center axial momentum; What the mixing of this place's flue gas mainly relied on burnout degree to go up in the width direction stirs and make muddy ability, and the spinning momentum square residual with burnout degree jet is herein relevant; Blade angle is less, and burnout degree jet axial momentum is larger, to main flume to penetrate effect better.
Figure 12 shows, although the spinning momentum square of fire air nozzle porch and swirler blades angle are proportionate, after the incident degree of depth of burnout degree jet reaches certain value, shows the state that spinning momentum square and blade angle are inverse correlation on the contrary.By contacting the relation of axial momentum and blade angle, conclusion draws: the fire air nozzle swirler blades angle of direct current contour stealth in increasing, burnout degree jet to main flow to penetrate effect poorer, have impact on spinning momentum square along the transmission in incident direction, accelerate its decay, what reduce that burnout degree jet goes up in the width direction to burner hearth central area on the contrary mixes ability.
Analog result shows, when the blade angle α in interior direct current contour stealth fire air nozzle cyclone 20 be 25-35 spend time, the spinning momentum square decay of burnout degree outlet jet is slower, rotation function can effective delivery value burner hearth center, combustible herein is fully mixed with air, ensures after-flame degree.
In addition, it should be noted that, the specific embodiment described in this description, the shape, institute's title of being named etc. of its parts and components can be different, and the above content described in this description is only to structure example of the present invention explanation.The equivalence change that structure, feature and the principle of all foundations described in inventional idea of the present invention are done or simple change, be included in the protection domain of patent of the present invention.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment; only otherwise depart from structure of the present invention or surmount this scope as defined in the claims, protection scope of the present invention all should be belonged to.
Claims (8)
1. one kind uses the burnout degree method of the W type flame boiler combustion exhausted wind apparatus of high-efficiency low-pollution, described W type flame boiler combustion exhausted wind apparatus comprises primary zone fire air nozzle, aileron fire air nozzle, chimney arch, lower hearth, upper furnace, annular passage and is provided with the bellows of after-flame stratification of wind, described bellows are positioned at the top of chimney arch, and close to the aditus laryngis of W type flame boiler, one end of described primary zone fire air nozzle is fixed on the water-cooling wall at the nearly aditus laryngis place of upper furnace, the other end is fixed on bellows, for being communicated with after-flame stratification of wind in bellows and burner hearth, after-flame stratification of wind in bellows is primary zone fire air nozzle air feed, and air force is regulated by wind-box damper and executing agency thereof, one end of described aileron fire air nozzle is connected on annular passage by pipeline, and the other end is connected to upper furnace on the water-cooling wall at side wall place, described after-flame stratification of wind, primary zone fire air nozzle and aileron fire air nozzle are positioned at same level height, the axis of described primary zone fire air nozzle and aileron fire air nozzle is all horizontal, this primary zone fire air nozzle and aileron fire air nozzle include air channel, center, outer shroud air channel and cyclone, air channel, described center is arranged in outer shroud air channel, described cyclone is arranged in outer shroud air channel, the blade angle of this cyclone is 25-35 degree, it is characterized in that: send into burnout degree to described primary zone fire air nozzle and aileron fire air nozzle, this after-flame air quantity accounts for the 10%-25% into stove total blast volume, the air quantity of single aileron fire air nozzle is the 1/2-2/3 of the air quantity of single primary zone fire air nozzle.
2. burnout degree method according to claim 1, it is characterized in that: the direction of rotation of described primary zone fire air nozzle and the direction of rotation of aileron fire air nozzle are arranged symmetrically between the left side wall and right-side wall of upper furnace, when sight line is observed along spout incident direction, the direction of rotation of the spout of side to the left is counterclockwise, and the direction of rotation of the spout of side to the right is clockwise.
3. burnout degree method according to claim 1, is characterized in that: the pipeline of described connection aileron fire air nozzle is provided with butterfly valve.
4. burnout degree method according to claim 1, is characterized in that: the position of described cyclone can regulate along the axial direction in outer shroud air channel, to reach the object adjusted the swirl strength of burnout degree jet.
5. the burnout degree method according to the arbitrary claim of claim 1-4, is characterized in that: in the fire air nozzle of described primary zone, and the air quantity in air channel, described center is 1-1.5 times of the air quantity in outer shroud air channel; In described aileron fire air nozzle, the air quantity in air channel, described center is 1-1.5 times of the air quantity in outer shroud air channel.
6. the burnout degree method according to the arbitrary claim of claim 1-4, is characterized in that: the wind speed in the air channel, center in described primary zone fire air nozzle and aileron fire air nozzle is 40-55m/s.
7. the burnout degree method according to the arbitrary claim of claim 1-4, is characterized in that: the wind speed in the outer shroud air channel in described primary zone fire air nozzle and aileron fire air nozzle is 35-45m/s.
8. burnout degree method according to claim 5, is characterized in that: described combustion exhausted wind apparatus is in running, and the air quantity in air channel, described center is definite value with the ratio of the air quantity in outer shroud air channel.
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