CN103672867A - Efficient low-pollution W-shaped flame boiler OFA (over fire air) device and method - Google Patents
Efficient low-pollution W-shaped flame boiler OFA (over fire air) device and method Download PDFInfo
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- CN103672867A CN103672867A CN201310619621.3A CN201310619621A CN103672867A CN 103672867 A CN103672867 A CN 103672867A CN 201310619621 A CN201310619621 A CN 201310619621A CN 103672867 A CN103672867 A CN 103672867A
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Abstract
The invention relates to an efficient low-pollution W-shaped flame boiler OFA (over fire air) device and method. Conventional large-capacity W-shaped flame boiler OFA equipment occupies large space and is complex in structure. The OFA device comprises main combustion zone OFA nozzles, wing wall OFA nozzles, an upper hearth, an annular air duct and an air box provided with OFA layers, and is characterized in that one end of each main combustion zone OFA nozzle is fixed on the water-cooled wall, close to the throat position, of the upper hearth, and the other end of each main combustion zone OFA nozzle is fixed on the air box; one end of each wing wall OFA nozzle is connected onto the annular air duct through a pipeline, and the other end of each wing wall OFA nozzle is connected onto the water-cooled wall, close to the side wall position, of the upper hearth; and each OFA nozzle comprises a center air duct, an outer annular air duct and a cyclone, and the center air ducts are located in the outer annular air ducts. The OFA method is characterized in that OFA is fed to the OFA nozzles, and the OFA volume accounts for 19%-25% of total volume of air entering the boiler. The efficient low-pollution W-shaped flame boiler OFA device is simple in structure and can guarantee full mixing of OFA and main stream smoke.
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 aspect burning: the time that 1. pulverized coal particle stops in stove is long; 2. fire box temperature level is high, is improving 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 the stable and fuel of the catching fire of low-volatile fuel, flame.Yet, due to higher temperature levels in W type flame boiler furnace, caused larger NOx growing amount, and in the < < fossil-fuel power plant atmospheric pollutant emission standard > > (GB13223 – 2011) that starts on July 1st, 2014 to carry out, for W type flame boiler NO
x the highest permission concentration of emission is 200mg/m
3(folding 6%O
2).
On W type flame boiler furnace top, install combustion exhausted wind apparatus additional and be a kind of wherein method that reduces emission of NOx of boiler level, domestic existing part Study: (China Patent No. is ZL 200410060622.X as patent of invention < < overfire air device of W typed flame boiler and method > >, Granted publication day is on January 17th, 2007, Granted publication number is CN1295460C, call " file one " in the following text), (China Patent No. is ZL 200620020919.8 to the W type flame furnace > > of a utility model patent < < low-NOx coal powder, Granted publication day is on May 30th, 2007, Granted publication number is CN2906360Y, call " file two " in the following text) all propose, on W type flame boiler, increase combustion exhausted wind apparatus, can reduce the oxygen amount of lower hearth, make it in reducing atmosphere, and reduce the temperature levels in lower hearth primary zone, thereby reduce NOx.But, what the after-flame wind snout of above-mentioned two patents adopted is all the version of direct current, although this version can make after-flame wind jet have stronger momentum, darker along the incident of furnace depth direction, but the lateral diffusion-capability of jet a little less than, cannot with adjacent jet between flue gas and coal dust mix, cause the after-flame degree variation of this part coal dust, unburned carbon in flue dust is higher, and grey phosphorus content is higher will reduce the coal consumption of boiler thermal output, increase power plant, the economic well-being of workers and staff of minimizing power plant.
And for example patent of invention < < complete mixing W type flame boiler combustion exhausted wind apparatus > > (China Patent No. is ZL 200810064934.6, Granted publication day to be that on June 23rd, 2010, Granted publication number are 101324339B, calls " file three " in the following text) is although the same after-flame wind snout that comprises internal layer air channel, outer air channel, swirl vane that arranges on upper furnace two side.But downward-sloping 30 degree of spout, can cause following problem: spout and connecting pipe volume thereof that (1) tilts are huge, and after-flame wind snout present position is also the region that bellows, buckstay and leveling apparatus are intensive, the detail design of combustion exhausted wind apparatus and installation are brought to difficulty; (2) after-flame wind snout is downward-sloping, is that the mixing point of after-flame wind jet and main flume is positioned at lower hearth, affects the formation in lower hearth " W " type dual reflux district, is unfavorable for burning tissue, and oxygen-depleted zone scope in stove is reduced.In addition, the after-flame wind 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 that is mainly reflected in boiler is poor, and combustion chamber draft fluctuation is large, easily fire extinguishing, and unburned carbon in flue dust sharply raises, degradation under boiler combustion efficiency.In addition, do not relate to arranging of the outer eddy flow after-flame wind snout direction of rotation combination of interior direct current, do not provide swirler blades angle, do not provide the bellows relevant to after-flame wind devices and the layout of pipeline yet.
For another example patent of invention < < is furnished with the W type flame boiler > > of clearance type after-flame wind snout (application number is 201310224328.7 on chimney arch, the applying date is on June 7th, 2013, publication number is CN103292318A, call " file four " in the following text) propose above aileron, to arrange clearance type combustion exhausted wind apparatus 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, a little less than 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 after-flame wind snout is arranged in arch owing to will avoiding the structures such as water-cooling wall bend pipe at a distance of farther, jet is difficult to main flow air-flow to form sealing.And " file four " do not relate to the air quantity of aileron after-flame wind.
In sum, existing large capacity (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, cannot guarantee that the well-mixed while of after-flame wind and main flume do not affect the tissue of primary zone burning, cause detail design and inconvenience be installed, reduce boiler thermal output, the problem such as increase power plant coal consumption.
Summary of the invention
The object of the invention is to solve that existing large capacity (more than 600MW) W type flame boiler combustion exhausted wind equipment takes up space greatly, complex structure, cannot take into account the incident degree of depth and lateral diffusion-capability, cannot guarantee that the well-mixed while of after-flame wind and main flume does not affect the tissue of primary zone burning, 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 addresses the above problem adopted technical scheme: the W type flame boiler combustion exhausted wind apparatus of this high-efficiency low-pollution comprises primary zone after-flame wind snout, aileron after-flame wind snout, 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 approach the aditus laryngis of W type flame boiler; Its design feature is: one end of described primary zone after-flame wind snout is fixed on the water-cooling wall at the nearly aditus laryngis of upper furnace place, the other end is fixed on bellows, for being communicated with after-flame stratification of wind and the burner hearth of bellows, after-flame stratification of wind in bellows is primary zone after-flame wind snout air feed, and air force is regulated by wind-box damper and executing agency thereof; One end of described aileron after-flame wind snout is connected on annular passage by pipeline, and the other end is connected on the water-cooling wall of upper furnace near side wall place; Described after-flame stratification of wind, primary zone after-flame wind snout and aileron after-flame wind snout are positioned at same level height, the axis of described primary zone after-flame wind snout and aileron after-flame wind snout is all horizontal, this primary zone after-flame wind snout and aileron after-flame wind snout 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 thus of the present invention simple in structurely, reduce construction cost and difficulty.Because the combustion exhausted wind apparatus volume of W type flame boiler of the present invention is little, can be installed at the front-back wall of upper furnace near throat location (with bellows after-flame stratification of wind same level position), both far away apart from furnace outlet, guarantee that uncompleted burned carbon and after-flame wind in flying dust have the sufficient reaction time, again the unlikely tissue that affects flow field, lower hearth " W " dual reflux district.The axis of primary zone after-flame wind snout and aileron district after-flame wind snout is level, is also for avoiding affecting the tissue in flow field, lower hearth " W " dual reflux district.After-flame wind snout is divided into two kinds of primary zone after-flame wind snout and aileron after-flame wind snouts, primary zone after-flame wind snout is corresponding one by one with arch burner, aileron after-flame wind snout is mainly to adopt 8 corner structures for W type flame boiler lower hearth, the burner at edge has 2.5 meters of above distances apart from side wall, 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 mobile trend of the oriented side wall of burner hearth central area air-flow, if aileron after-flame wind snout is not set, near side wall, easily form in " flue gas corridor ", a large amount of main flumes are without mixing and just enter Ping Qu with after-flame wind, make excess air coefficient corresponding to side wall part low, in oxygen deprivation state, unburned combustible in fly ash is raise, flue gas is herein cooling without after-flame wind, bring side water wall face overtemperature, the bad working environments such as slagging scorification.And arranging aileron after-flame wind snout, the present invention can address the above problem.The blade angle of cyclone is got 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 after-flame wind snout and the direction of rotation of aileron after-flame wind snout are arranged symmetrically between the left side of upper furnace wall and right-side wall, when sight line is observed along spout incident direction, the direction of rotation of the spout of the side of taking back is for counterclockwise, and the direction of rotation of the spout of the side that takes over is clockwise direction.The trend that this arrangement mode of the present invention makes flue gas gather at oriented burner hearth center, after-flame wind bottom, reduction is because burner hearth central area temperature is high, the trend that flue gas moves to side wall, is conducive to the flue gas of lower hearth in oxygen deprivation state and mixes with after-flame wind more fully.And at after-flame wind, add the high-temperature flue gas at rear hearth center to move to side wall along eddy flow direction, and reduce to shield district's flue gas flow rate deviation and cigarette temperature deviation, be conducive to the safe and stable operation of boiler.
As preferably, on the pipeline of connection aileron after-flame wind snout of the present invention, butterfly valve is installed.Make thus the present invention can regulate separately the flow of each aileron after-flame wind snout, 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 that the swirl strength of after-flame wind jet is adjusted.
A kind of after-flame wind method of using combustion exhausted wind apparatus, its feature is: to described primary zone after-flame wind snout and aileron after-flame wind snout, send into after-flame wind, this after-flame air quantity accounts for the 10%-25% into stove total blast volume, and the air quantity of single aileron after-flame wind snout is the 1/2-2/3 of the air quantity of single primary zone after-flame wind snout.Analog result draws, when get the air quantity of single aileron district after-flame wind snout be single primary zone after-flame wind snout air quantity 1/2 ~ 2/3 time, can eliminate near " flue gas corridor " phenomenon of side wall, and evenly along the oxygen in furnace chamber width, distribute, make near the excess air coefficient of center and side wall in same level.
As preferably, in the after-flame wind snout of primary zone of the present invention, the air quantity in air channel, described center be outer shroud air channel air quantity 1-1.5 doubly; In described aileron after-flame wind snout, the air quantity in air channel, described center be outer shroud air channel air quantity 1-1.5 doubly.Make thus the present invention can mate axial momentum and the swirl strength of after-flame wind snout, take into account swirl strength along the lateral diffusion-capability of the transmission in incident direction and after-flame wind jet.
As preferably, the wind speed in primary zone of the present invention after-flame wind snout and air channel, aileron after-flame wind snout Zhong center is 40-55m/s.Make thus the present invention can strengthen after-flame wind jet rigidity, guarantee jet penetrating main flume.
As preferably, the wind speed in the outer shroud air channel in primary zone of the present invention after-flame wind snout and aileron after-flame wind snout is 35-45m/s.Make thus the present invention make after-flame wind jet there is better swirl strength, the axial momentum of this swirl strength and main flume matches, take into account swirl strength along the lateral diffusion-capability of the transmission in incident direction and after-flame wind jet, so, under the effect of this outward turning flow and inner direct flow after-flame wind snout, after-flame wind energy is fully mixed 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 thus the present invention can guarantee under arbitrary load, after-flame wind snout jet is consistent to the effect that penetrates of main flume.
The present invention compared with prior art, has the following advantages and effect: the combustion exhausted wind apparatus of (1) W type flame boiler simple in structure, reduces construction cost and difficulty.Because the combustion exhausted wind apparatus volume of W type flame boiler is little, can be installed at the front-back wall of upper furnace near throat location (with bellows after-flame stratification of wind same level position), both far away apart from furnace outlet, guarantee that uncompleted burned carbon and after-flame wind in flying dust have the sufficient reaction time, again the unlikely tissue that affects flow field, lower hearth " W " dual reflux district.The axis of primary zone after-flame wind snout and aileron district after-flame wind snout is level, is also for avoiding affecting the tissue in flow field, lower hearth " W " dual reflux district.
(2) after-flame wind snout is divided into two kinds of primary zone after-flame wind snout and aileron after-flame wind snouts, primary zone after-flame wind snout is corresponding one by one with arch burner, aileron after-flame wind snout is mainly to adopt 8 corner structures for W type flame boiler lower hearth, the burner at edge has 2.5 meters of above distances apart from side wall, 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 mobile trend of the oriented side wall of burner hearth central area air-flow, if aileron after-flame wind snout is not set, near side wall, easily form in " flue gas corridor ", a large amount of main flumes are without mixing and just enter Ping Qu with after-flame wind, make excess air coefficient corresponding to side wall part low, in oxygen deprivation state, unburned combustible in fly ash is raise.Flue gas is herein cooling without after-flame wind, brings the bad working environments such as side water wall face overtemperature, slagging scorification.And being set, aileron after-flame wind snout can address the above problem.According to analog result, draw, when get the air quantity of single aileron district after-flame wind snout be single primary zone after-flame wind snout air quantity 1/2 ~ 2/3 time, can eliminate the generation in " flue gas corridor ", and evenly along the oxygen in furnace chamber width, distribute, make near the excess air coefficient of center and side wall in same level.
(3) the outer eddy flow design of direct current in primary zone after-flame wind snout and aileron district after-flame wind snout.The air quantity in air channel, center is larger, and the ratio 1:1 ~ 1.5:1 that maintains design with the air quantity in outer shroud air channel passes into burner hearth, and wind speed is between 40 ~ 55m/s, and jet rigidity is stronger, guarantees jet penetrating main flume; Another strand of wind enters outer shroud air channel, cyclone via fixed angle, outlet wind speed 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 swirl strength along the lateral diffusion-capability of the transmission in incident direction and after-flame wind jet, so, under the effect of this outward turning flow and inner direct flow after-flame wind snout, after-flame wind energy is fully mixed with flue gas up from lower hearth.Between angle value 25 degree ~ 35 degree of cyclone camber blades, the actual range that concrete value is looked between furnace depth and two adjacent after-flame wind snouts is determined.Cyclone position in outer shroud air channel can regulate along the axial direction of after-flame wind snout, can adjust swirl strength.
(4) primary zone after-flame wind snout and aileron after-flame wind snout direction of rotation are arranged symmetrically with between the side wall of upper furnace left and right, front wall left side spout is for being rotated counterclockwise, front wall right side spout is for turning clockwise, and rear wall left side spout is for being rotated counterclockwise, and Hou Qiang right side spout is clockwise.This arrangement mode obtains the trend that flue gas is gathered at oriented burner hearth center, after-flame wind bottom, cuts down because burner hearth central area temperature is high, and the trend that flue gas moves to side wall, is conducive to the flue gas of lower hearth in oxygen deprivation state and mixes with after-flame wind more fully.And at after-flame wind, add the high-temperature flue gas at rear hearth center to move to side wall along eddy flow direction, and reduce to shield district's flue gas flow rate deviation and cigarette temperature deviation, be conducive to the safe and stable operation of boiler.
Accompanying drawing explanation
Fig. 1 is that the W type flame boiler combustion exhausted wind apparatus of high-efficiency low-pollution in the embodiment of the present invention is removed the overall structure schematic diagram after bellows.
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 that the W type flame boiler combustion exhausted wind apparatus of high-efficiency low-pollution in the embodiment of the present invention forms the structural representation in " flue gas corridor " while being unkitted aileron after-flame wind snout.
Fig. 6 is the structural representation of after-flame wind snout 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 after-flame wind snout in the embodiment of the present invention.
Fig. 9 is the structural representation of the blade on the cyclone in after-flame wind snout in the embodiment of the present invention.
Figure 10 is the plan structure schematic diagram of Fig. 9.
Figure 11 is that different swirler blades angle spout axial momentums are along the situation of change schematic diagram of the incident degree of depth.
Figure 12 is that the different swirler blades angle nozzle outlet rotary moment of momentum are along the situation of change schematic diagram of the incident degree of depth.
In figure: primary zone after-flame wind snout 1, aileron after-flame wind snout 2, chimney arch 3, lower hearth 4, upper furnace 5, after-flame windshield plate and executing agency 6 thereof, containing bellows 7, 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, the cyclone 20 of after-flame stratification of wind.
The specific embodiment
Below in conjunction with accompanying drawing and 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.
Referring to 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 after-flame wind snout 1, aileron after-flame wind snout 2, chimney arch 3, lower hearth 4, upper furnace 5, after-flame windshield plate and executing agency 6 thereof, the bellows 7 that are 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 approach 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 after-flame wind snout 1 in the present embodiment is fixed on the water-cooling wall at upper furnace 5 nearly aditus laryngis places, the other end is fixed on bellows 7, for being communicated with after-flame stratification of wind 8 and the burner hearth of bellows 7, after-flame stratification of wind 8 is primary zone after-flame wind snout 1 air feed, and air force is regulated by after-flame windshield plate and executing agency 6 thereof.
One end of aileron after-flame wind snout 2 in the present embodiment is connected on annular passage 12 by pipeline 14, butterfly valve 13 is arranged on the pipeline 14 that connects aileron after-flame wind snout 2, air quantity is regulated by butterfly valve 13, and the other end is connected on the water-cooling wall of upper furnace 5 near side wall place.
After-flame stratification of wind 8 in the present embodiment, primary zone after-flame wind snout 1 and aileron after-flame wind snout 2 are positioned at same level height, and the axis of primary zone after-flame wind snout 1 and aileron after-flame wind snout 2 is all horizontal.Primary zone after-flame wind snout 1 and aileron after-flame wind snout 2 in the present embodiment 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, the actual range that concrete value is looked between furnace depth and two adjacent after-flame wind snouts is determined, cyclone 20 positions in outer shroud air channel 19 in axial direction can regulate, and can adjust swirl strength.
The direction of rotation of the primary zone after-flame wind snout 1 in the present embodiment and the direction of rotation of aileron after-flame wind snout 2 are arranged symmetrically between the left side of upper furnace 5 wall 16 and right-side wall 17, when sight line is observed along spout incident direction, the direction of rotation of the spout of the side of taking back is for counterclockwise, and the direction of rotation of the spout of the side that takes over is clockwise direction.
The W type flame boiler combustion exhausted wind method of the high-efficiency low-pollution in the present embodiment is as follows: to primary zone after-flame wind snout 1 and aileron after-flame wind snout 2, send into after-flame wind, this after-flame air quantity accounts for the 10%-25% into stove total blast volume, and the air quantity of single aileron after-flame wind snout 2 is 1/2-2/3 of the air quantity of single primary zone after-flame wind snout 1.In primary zone after-flame wind snout 1, the air quantity in air channel, center 18 be outer shroud air channel 19 air quantity 1-1.5 doubly; In aileron after-flame wind snout 2, the air quantity in air channel, center 18 be outer shroud air channel 19 air quantity 1-1.5 doubly.Wind speed in primary zone after-flame wind snout 1 and aileron after-flame wind snout 2 air channels, Zhong center 18 is 40-55m/s.The wind speed in the outer shroud air channel 19 in primary zone after-flame wind snout 1 and aileron after-flame wind snout 2 is 35-45m/s.Generally, 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 can control air force by secondary air damper and executing agency 11 thereof.In bellows 7 of the present invention, after-flame stratification of wind 8 is set, this after-flame stratification of wind 8 and primary zone after-flame wind snout 1 and aileron after-flame wind snout 2 same level height, be used to primary zone after-flame wind snout 1 air feed.One end of primary zone after-flame wind snout 1 in the present invention can be fixed on the water-cooling wall at upper furnace 5 nearly aditus laryngis places by seal box 9, and the other end of aileron after-flame wind snout 2 also can be connected on the water-cooling wall of upper furnace 5 near side wall place by seal box 9.After-flame wind snout in the present invention is divided into 2 two kinds of primary zone after-flame wind snout 1 and aileron after-flame wind snouts, and extraneous coal dust spout 15 belongs to prior art with annexation of the present invention.
The present invention enters burner hearth after-flame wind jet through air channel, center 18 has larger axial momentum, after-flame wind 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, thereby there is certain lateral diffusion-capability, make jet can cover the region between adjacent two after-flame wind snouts, to guarantee that flue gas fully mixes.
The primary zone after-flame wind snout that uses anthracitic W type flame boiler for a 600MW is done Modelling Test and numerical simulation; while drawing the pressure of bellows 1000Pa, after-flame wind-warm syndrome 615K; primary zone after-flame wind snout 1 axial momentum of the blade angle of different cyclones 20 and spinning momentum square are along the distribution on incident depth direction, respectively as shown in Figure 11 and Figure 12.The result of Figure 11 shows: the after-flame wind jet liquidating levels off to zero at burner hearth center axial momentum, is stagnation state; The mixing of this place's flue gas mainly relies on the ability of stiring and make muddy in after-flame wind broad ways, and the spinning momentum square residual with after-flame wind jet is herein relevant; Blade angle is less, and after-flame wind jet axial momentum is larger, to main flume to penetrate effect better.
Figure 12 shows, although the spinning momentum square of after-flame wind snout porch and swirler blades angle are proportionate, after the after-flame wind jet incident degree of depth reaches certain value, shows on the contrary the state that spinning momentum square and blade angle are inverse correlation.By the relation of contact axial momentum and blade angle, conclusion draws: the after-flame wind snout swirler blades angle of the outer eddy flow of direct current in increasing, after-flame wind jet to main flow to penetrate effect poorer, affected spinning momentum square along the transmission in incident direction, accelerate its decay, reduced on the contrary after-flame wind jet to the ability of mixing in the broad ways of burner hearth central area.
Analog result shows, blade angle α outside interior direct current in eddy flow after-flame wind snout cyclone 20 is that 25-35 is when spend, the spinning momentum square decay of after-flame wind outlet jet is slower, effectively transmission value of rotation function burner hearth center, combustible herein is fully mixed with air, guarantee after-flame degree.
In addition, it should be noted that, the specific embodiment described in this description, the shape of its parts and components, institute's title of being named etc. can be different, and the above content described in this description is only to structure example of the present invention explanation.All equivalence variation or simple change of doing according to described structure, feature and the principle of patent design of the present invention, are included in the protection domain of patent of the present invention.Those skilled in the art can make various modifications or supplement or adopt similar mode to substitute described specific embodiment; only otherwise depart from structure of the present invention or surmount this scope as defined in the claims, all should belong to protection scope of the present invention.
Claims (9)
1. the W type flame boiler combustion exhausted wind apparatus of a high-efficiency low-pollution, comprise primary zone after-flame wind snout, aileron after-flame wind snout, chimney arch, lower hearth, upper furnace, annular passage and be provided with the bellows of after-flame stratification of wind, described bellows are positioned at the top of chimney arch, and approach the aditus laryngis of W type flame boiler; It is characterized in that: one end of described primary zone after-flame wind snout is fixed on the water-cooling wall at the nearly aditus laryngis of upper furnace place, the other end is fixed on bellows, for being communicated with after-flame stratification of wind and the burner hearth of bellows, after-flame stratification of wind in bellows is primary zone after-flame wind snout air feed, and air force is regulated by wind-box damper and executing agency thereof; One end of described aileron after-flame wind snout is connected on annular passage by pipeline, and the other end is connected on the water-cooling wall of upper furnace near side wall place; Described after-flame stratification of wind, primary zone after-flame wind snout and aileron after-flame wind snout are positioned at same level height, the axis of described primary zone after-flame wind snout and aileron after-flame wind snout is all horizontal, this primary zone after-flame wind snout and aileron after-flame wind snout 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.
2. the W type flame boiler combustion exhausted wind apparatus of high-efficiency low-pollution according to claim 1, it is characterized in that: the direction of rotation of described primary zone after-flame wind snout and the direction of rotation of aileron after-flame wind snout are arranged symmetrically between the left side of upper furnace wall and right-side wall, when sight line is observed along spout incident direction, the direction of rotation of the spout of the side of taking back is for counterclockwise, and the direction of rotation of the spout of the side that takes over is clockwise direction.
3. the W type flame boiler combustion exhausted wind apparatus of high-efficiency low-pollution according to claim 1, is characterized in that: on the pipeline of described connection aileron after-flame wind snout, butterfly valve is installed.
4. the W type flame boiler combustion exhausted wind apparatus of high-efficiency low-pollution 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 that the swirl strength of after-flame wind jet is adjusted.
5. a right to use requires the after-flame wind method of 1,2,3 or 4 device, it is characterized in that: to described primary zone after-flame wind snout and aileron after-flame wind snout, send into after-flame wind, this after-flame air quantity accounts for the 10%-25% into stove total blast volume, and the air quantity of single aileron after-flame wind snout is the 1/2-2/3 of the air quantity of single primary zone after-flame wind snout.
6. after-flame wind method according to claim 5, is characterized in that: in the after-flame wind snout of described primary zone, the air quantity in air channel, described center be outer shroud air channel air quantity 1-1.5 doubly; In described aileron after-flame wind snout, the air quantity in air channel, described center be outer shroud air channel air quantity 1-1.5 doubly.
7. after-flame wind method according to claim 5, is characterized in that: the wind speed in described primary zone after-flame wind snout and air channel, aileron after-flame wind snout Zhong center is 40-55m/s.
8. after-flame wind method according to claim 5, is characterized in that: the wind speed in the outer shroud air channel in described primary zone after-flame wind snout and aileron after-flame wind snout is 35-45m/s.
9. after-flame wind method according to claim 6, 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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| CN107830517A (en) * | 2017-05-02 | 2018-03-23 | 浙江大学 | A kind of the side wind and side combustion exhausted wind apparatus of front-back wall burning |
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| CN108386832B (en) * | 2018-01-12 | 2019-10-11 | 宁波大学 | A kind of side wall dominates the efficient after-flame W flame boiler of low nitrogen of symmetrical combustion |
| CN108167823A (en) * | 2018-01-29 | 2018-06-15 | 西安交通大学 | A kind of band axial direction adjustable vane prevents the device of burner nozzle slagging |
| CN109340810A (en) * | 2018-11-22 | 2019-02-15 | 西安交通大学 | A kind of secondary air distribution structure reducing layer burner unburned carbon in flue dust |
| CN109668145A (en) * | 2019-01-10 | 2019-04-23 | 中节环立为（武汉）能源技术有限公司 | A kind of high speed flow-disturbing wind apparatus |
| CN110107911A (en) * | 2019-04-30 | 2019-08-09 | 华电电力科学研究院有限公司 | A kind of novel secondary wind system and its working method for face-fired boiler |
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| CN111550820A (en) * | 2020-05-25 | 2020-08-18 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Boiler over-fire air adjusting method based on power moment |
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