CN106524137B - A kind of multi-ejection classification W flame boiler using vortex burner - Google Patents

A kind of multi-ejection classification W flame boiler using vortex burner Download PDF

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Publication number
CN106524137B
CN106524137B CN201610949784.1A CN201610949784A CN106524137B CN 106524137 B CN106524137 B CN 106524137B CN 201610949784 A CN201610949784 A CN 201610949784A CN 106524137 B CN106524137 B CN 106524137B
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China
Prior art keywords
air
chimney arch
burner
vortex burner
completely
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CN201610949784.1A
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Chinese (zh)
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CN106524137A (en
Inventor
陈智超
王青祥
李鑫
张鑫
张晓研
曾令艳
李争起
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哈尔滨工业大学
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C5/00Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
    • F23C5/08Disposition of burners
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00Combustion apparatus characterised by arrangements for air supply
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00Combustion apparatus characterised by arrangements for air supply
    • F23C7/02Disposition of air supply not passing through burner
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D1/00Burners for combustion of pulverulent fuel
    • F23D1/02Vortex burners, e.g. for cyclone-type combustion apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2201/00Staged combustion
    • F23C2201/20Burner staging
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2700/00Special arrangements for combustion apparatus using fluent fuel
    • F23C2700/06Combustion apparatus using pulverized fuel

Abstract

A kind of multi-ejection using vortex burner is classified W flame boiler, and the present invention relates to a kind of boiler, the present invention is in order to further decrease the NO of the W flame boiler for using vortex burnerxDischarge amount and unburned combustible in fly ash.The vortex burner that W flame boiler of the present invention uses Secondary Air to bias completely, secondary air channel is deviated relative to primary air piping to far from burner hearth center side, final inner second air pipe, the contact of the tube wall of outer second air pipe and primary air piping, Secondary Air is formed to bias completely, it is interior far from burner hearth center, outer second air step by step penetrate under thick coal culm air-flow by injection and carrying, realize first, second level fractional combustion, lack of gas, classification wind and fire air nozzle are all made of the arrangement that has a down dip, realize third, four, five, six grades of fractional combustions, multi-ejection grading combustion is realized using the W flame boiler of vortex burner.The invention belongs to W flame technical field of boiler combustion.

Description

A kind of multi-ejection classification W flame boiler using vortex burner

Technical field

The present invention relates to a kind of boilers, and in particular to a kind of multi-ejection classification W flame using vortex burner Boiler.

Background technique

The W flame boiler of turbulent burner is that a kind of aim at uses anthracite, meager coal and the boiler designed in the prior art, This boiler generally existing following problems in actual moving process.

60% or more of total blast volume is accounted for using the arch windward of the W flame boiler of turbulent burner, coal dust firing initial oxidation Strong, the NO of propertyxDischarge amount is high.NOxThere is intoxicating effect to animal and human body, is to form one of main matter of acid rain, and formed A key factor of the important substance of photochemical fog and destruction atmospheric ozone layer in atmosphere.According to " thermal power plant's atmosphere pollution Object discharge standard " GB13223-2011, W flame boiler NOxHighest allows concentration of emission to be 200mg/m3, due to W flame Boiler Furnace Thorax exports NOxDischarge amount superelevation only is difficult to reach this discharge standard by tail portion denitration, and there is an urgent need to using turbulent burner W flame boiler combustion system carry out brand-new design.

Using the W flame boiler low volatile coal of turbulent burner, breeze airflow kindling is late, under main breeze airflow Scouring depth degree is small, and unburned combustible in fly ash is high, and coal dust burn-off rate is low.Unburned combustible in fly ash height not only causes boiler imperfect combustion Loss increases, and reduces boiler thermal efficiency, and constitute serious threat to the safe operation of boiler, easily bring superheater slagging and The problems such as flue second-time burning, low-temperature corrosion and abrasion, the safety of boiler operatiopn and economy is made to be affected.

Chinese invention patent " method of multi-ejection grading combustion and the W flame boiler plant for realizing this method " publication date For September in 2010 15 days, be on April 19th, 2010 application No. is the 201010149634.5, applying date, propose to use clearance type The multi-ejection grading combustion method of the W flame boiler of DC burner, reduces NO to a certain extentxDischarge amount and flying dust can Combustion things content, ash erosion are slight.But due to there is no burnout degree, NO in actual operationxDischarge amount is still up to 1000mg/ m3, and unburned combustible in fly ash is still in a higher level.Chinese invention patent " first and second windage yaw of vortex burner The W flame boiler of heart arrangement " publication date is on May 4th, 2016, application No. is the 201511007686.8, applying date is 2015 December 28, the method for proposing first and second air hose arranged off-centre of the turbulent burner of W flame boiler realize Secondary Air part Biasing can reduce NO to a certain extentxDischarge amount and unburned combustible in fly ash prevent lower hearth front-back wall water-cooling wall slagging, but The turbulent burner only with the biasing of Secondary Air part, and the air flow rate proportioning that unresolved arch is upper and arch is lower, encircle upper air volume according to 60% of total blast volume or more so is accounted for, fails the low NO for showing burner completelyxCharacteristic, NO in actual motionxDischarge amount is up to 950mg/m3, unburned combustible in fly ash is up to 9%.In order to further decrease NOxProduction quantity and unburned combustible in fly ash, for this Kind uses the W flame boiler of turbulent burner, proposes a kind of boiler of completely new multi-ejection grading combustion.

Summary of the invention

The present invention in order to further decrease use vortex burner W flame boiler NOxDischarge amount and flying dust can The problem of combustion things content, and then a kind of multi-ejection classification W flame boiler using vortex burner is provided.

The technical solution adopted by the present invention to solve the above problem is as follows: it includes lower hearth, upper furnace, preceding chimney arch and rear furnace Arch, it further includes that N number of preceding chimney arch Secondary Air biases vortex burner completely, N number of rear chimney arch Secondary Air biases eddy flow completely Coal burner, N number of preceding lack of gas wind snout, it is N number of after lack of gas wind snouts, it is N number of before classification wind snout, it is N number of after classification wind snout, Fire air nozzle after the preceding fire air nozzle of 2N group and 2N group;Upper furnace, lower hearth, preceding chimney arch and rear chimney arch constitute burner hearth, N number of Preceding chimney arch Secondary Air is biased completely before vortex burner is uniformly arranged on chimney arch, and N number of rear chimney arch Secondary Air biases completely Vortex burner is uniformly arranged on rear chimney arch, and preceding chimney arch Secondary Air biases rotational flow coal dust completely each of on preceding chimney arch Burner biases vortex burner with chimney arch Secondary Air after one on rear chimney arch respectively completely and is correspondingly arranged, each forehearth Arch Secondary Air biases completely is from top to bottom successively arranged a preceding lack of gas wind spray respectively at water-cooling wall below vortex burner Mouthful and one before be classified wind snout, it is each after chimney arch Secondary Air bias at the water-cooling wall of vortex burner lower section completely respectively by It is classified wind snout after lack of gas wind snout and one after being successively arranged one under, has been uniformly arranged 2N on the front wall of upper furnace Fire air nozzle before group, it is each before chimney arch Secondary Air bias completely vortex burner respectively correspond be provided with two groups before after-flame Wind snout, fire air nozzle is from top to bottom inclined on the front wall of upper furnace before two groups, is laid on the rear wall of upper furnace Be equipped with fire air nozzle after 2N group, it is each after chimney arch Secondary Air bias vortex burner completely and respectively correspond and be provided with two groups Fire air nozzle afterwards, fire air nozzle is from top to bottom inclined on the rear wall of upper furnace after two groups.

The beneficial effects of the present invention are:

1 present invention considerably reduces NOxDischarge amount

After vortex burner Secondary Air of the invention biases completely, close to burner hearth center side burner secondary air flow It reduces, so that the breeze airflow close to burner hearth center side is burnt in the environment of fuel-rich hypoxemia, effectively inhibit NOxLife At.Compared with former combustion system, using multi-ejection grading combustion system of the present invention, in heating condition and heat all phases are received With in the case where, the breeze airflow close to burner hearth center side heats up faster, and coal powder ignition is timely, and original turbulent burner First air and Secondary Air be it is coaxial, due to breeze airflow catch fire evening, cause breeze airflow catch fire before primary and secondary air start to mix It closes, the air classification effect of turbulent burner is poor, and after applying the present invention, burner Secondary Air biases completely realizes air Classification, advantageously reduces NOx.Close to rear chimney arch Secondary Air bias below vortex burner completely the side water-cooling wall 2-1 with The outer second air amount for biasing the side water-cooling wall 2-2 below vortex burner completely close to preceding chimney arch Secondary Air increases, undershoot Momentum increases, and biases the side water-cooling wall 2-1 and close preceding chimney arch below vortex burner completely close to rear chimney arch Secondary Air It is relatively slow that Secondary Air biases water-cooling wall mono- sidewind heating rate of 2-2 below vortex burner completely, secondary air temperature phase To lower, rigidity is stronger, bias the vortex burner lower section side water-cooling wall 2-1 completely close to rear chimney arch Secondary Air and leans on The outer second air that nearby chimney arch Secondary Air biases the side water-cooling wall 2-2 below vortex burner completely penetrates larger depth under It just mutually mixes with the mixed airflow of First air and inner second air afterwards and carries primary wind and powder and continue deeper into, breeze airflow is for a long time also It burns in originality atmosphere, advantageously reduces NOx.Meanwhile Secondary Air, lack of gas wind, classification wind and the double-deck burnout degree make furnace on arch Interior deeply staged combustion, changes the combustion method that original arch windward rate is 60% or more, and arch windward rate is reduced to 45% left side The right side advantageously reduces NOxDischarge amount.

2 present invention considerably reduce unburned combustible in fly ash

After vortex burner Secondary Air of the invention biases completely, First air directly connects with furnace high-temperature backflow flue gas Touching, coal powder ignition is timely and stablizes burning, so that coal dust burn-off rate is improved, while inner second air first carries First air downlink, Primary wind and powder and inner second air are carried down again by outer second air after decaying to a certain degree and are penetrated, and are penetrated and are doubled under making, extend The stroke of primary wind and powder and improve after-flame, to reduce unburned combustible in fly ash.Incident lack of gas and classification wind at a certain angle The stroke that primary wind and powder was further penetrated and extended down to coal dust can be carried, primary wind and powder is made to go deep into dry bottom hopper region, pulverized coal particle Have enough residence times in the lower hearth of high temperature and obtain preferable after-flame effect, reduces unburned combustible in fly ash.In addition, It adds the double-deck burnout degree close to throat location and upper furnace front-back wall on arch farthest and makes coal dust full combustion, effectively mention The high burn-off rate of coal dust, reduces unburned combustible in fly ash.

In addition, the present invention and background technique publication date are September in 2010 15, application No. is 201010149634.5, Shens It please be on April 19th, 2010 " method of multi-ejection grading combustion and the W flame boiler plant for realizing this method " and openly day Day is on May 4th, 2016, is " vortex burner on December 28th, 2015 application No. is the 201511007686.8, applying date The W flame boiler of primary and secondary air arranged off-centre " it compares, there is following difference in technical solution:

A, and application No. is the differences of 201010149634.5 patents the following:

Difference in structure: 1. " application No. is 201010149634.5 patents " uses clearance type DC burner, on arch It has been sequentially arranged thick coal culm spout, inner second air spout, thin powdered coal spout, outer second air spout, and the present invention uses Secondary Air The turbulent burner biased completely.2. the present invention arrangement underlying using lack of gas, and it is upper close to throat location and upper in arch Burner hearth front-back wall adds the double-deck burnout degree.

Burning tissues principle is different: 1. " application No. is 201010149634.5 patents " uses clearance type DC burner, And the present invention use turbulent burner, Secondary Air is Whirl deposite tank, compared with clearance type DC burner, turbulent burner one, Secondary Air mixing it is relatively more strong, oxygen required for First air burning initial stage can be replenished in time, make boiler combustion exhausted rate compared with Height creates a further reduction unburned combustible in fly ash, while turbulent burner has high volume suction rate to surrounding medium, in exit It can quickly mix, flow rotation is strong, forms high temperature recirculation zone, improves the stability of flame;2. the eddy flow that the present invention uses Burner itself is capable of forming Researched of Air Staging Combustion Burning Pulverized Coal, while breeze airflow further fractional combustion in furnace, advantageously reduces NOx Discharge amount;3. the present invention arrangement underlying using lack of gas, and added in the upper close throat location of arch and upper furnace front-back wall The double-deck burnout degree enhances Researched of Air Staging Combustion Burning Pulverized Coal in burner hearth, is conducive to further decrease NOxDischarge amount.4. " application No. is It is horizontal that the burning of burner hearth internal classification is measured in 201010149634.5 patents " with wind speed, wind speed itself cannot embody flake hearth-tapping Interior fractional combustion is horizontal, and air quantity needed for capable of accurately guaranteeing each grade of fractional combustion using wind rate, using wind rate to pot The actual motion of furnace and the design applicability of New-type boiler are stronger.Two on the arch of " 5. application No. is 201010149634.5 patents " Secondary wind rate is 60% or so, and wind rate is high, is unfavorable for reducing NOx, and secondary air flow accounts for 45% of total blast volume or so on present invention arch, Coal dust firing initial stage is in reducing atmosphere, makes furnace outlet NOxDischarge amount is greatly lowered.

B, there is the following with the difference of " application No. is 201511007686.8 patents ":

Difference in structure: " application No. is 201511007686.8 patents " is only in turbulent burner close to burner hearth center one It installs block at the inside and outside overfire air port of side additional and forms the biasing of Secondary Air part, close to burner hearth center side burner Secondary Air Amount part is reduced, and secondary air channel of the present invention is deviated relative to primary air piping to separate burner hearth center side, final inner second air The tube wall contact of pipe, outer second air pipe and primary air piping, forms Secondary Air and biases completely, the Secondary Air close to burner hearth center side Amount is greatly reduced.Compared with " application No. is 201511007686.8 patents ", after applying the present invention, First air and furnace high-temperature Flue gas directly contacts, and breeze airflow and the enhancing of furnace high-temperature forced convective heat transfer of flue, First air breeze airflow heating rate are accelerated, coal Powder kindling further shifts to an earlier date." application No. is 201511007686.8 patents " be for furnace combustion system certain a part and Speech, and the present invention be directed to the entire combustion systems in W flame Boiler Furnace.

Burning tissues principle is different: the 1. vortex burner Secondary Air of " application No. is 201511007686.8 patents " Part biases, and vortex burner Secondary Air of the invention biases completely, and the secondary air flow close to burner hearth center side is big Amplitude is reduced, and coal powder ignition further shifts to an earlier date, and unburned combustible in fly ash further decreases.2. " application No. is The turbulent burner that 201511007686.8 patents " are biased only with Secondary Air part, and the unresolved wind encircleed under upper and arch Amount proportion, arch upper air volume still account for 60% or more of total blast volume, and coal dust firing initial stage is still in oxidizing atmosphere, cannot be complete Show its low NO entirelyxCharacteristic, and after the present invention is using deeply staged combustion in furnace, the secondary air flow of burner accounts for total blast volume on arch 45% or so, coal dust firing initial stage is in reducing atmosphere, makes furnace outlet NOxDischarge amount is greatly lowered.3. this hair It is bright to add the double-deck burnout degree in the upper close throat location of arch and upper furnace front-back wall, Researched of Air Staging Combustion Burning Pulverized Coal in burner hearth is enhanced, is had Conducive to further decreasing NOxDischarge amount.

C, and after " application No. is 201010149634.5 patents " and " application No. is 201511007686.8 patents " integration Difference:

1. the vortex burner Secondary Air part of " application No. is 201511007686.8 patents " biases, can not embody Ejection grading combustion effect in furnace.2. " application No. is 201010149634.5 patents " and " application No. is 201511007686.8 Patent " is not provided with burnout degree, and furnace internal classification effect is poor.3. encircleing the difference of windward rate: " application No. is Secondary air ratio is 60% or so in 201010149634.5 patents " and the arch of " application No. is 201511007686.8 patents ", and It is 45% or so that the present invention, which encircles windward rate,.

Detailed description of the invention

Fig. 1 is overall structure main view of the present invention, and arrow direction is air motion direction in figure, Fig. 2 be in Fig. 1 A to showing It is intended to, Fig. 3 is that preceding chimney arch Secondary Air biases vortex burner schematic diagram completely in Fig. 1.

Specific embodiment

Specific embodiment 1: illustrate present embodiment in conjunction with Fig. 1-Fig. 3, it is a kind of described in present embodiment to use eddy flow The multi-ejection of coal burner is classified W flame boiler, it includes lower hearth 1, upper furnace 2, preceding chimney arch 3 and rear chimney arch 17, it It further include that N number of preceding chimney arch Secondary Air biases vortex burner completely, N number of rear chimney arch Secondary Air biases rotational flow coal dust combustion completely Burner, N number of preceding lack of gas wind snout 10, it is N number of after lack of gas wind snout 13, it is N number of before classification wind snout 11, it is N number of after classification wind snout 12, Fire air nozzle 16 after the preceding fire air nozzle 15 of 2N group and 2N group;Upper furnace 2, lower hearth 1, preceding chimney arch 3 and rear chimney arch 17 are constituted Burner hearth, N number of preceding chimney arch Secondary Air are biased completely before vortex burner is uniformly arranged on chimney arch 3, N number of rear chimney arch Secondary Air Biasing vortex burner completely is uniformly arranged on rear chimney arch 17, and preceding chimney arch Secondary Air is complete each of on preceding chimney arch 3 Biasing vortex burner biases vortex burner pair with chimney arch Secondary Air after one on rear chimney arch 17 respectively completely It should be arranged, each preceding chimney arch Secondary Air biases completely to be distinguished from top to bottom successively at water-cooling wall 2-2 below vortex burner Equipped with wind snout 11 is classified before a preceding lack of gas wind snout 10 and one, each rear chimney arch Secondary Air biases rotational flow coal dust combustion completely Wind snout is classified after lack of gas wind snout 13 and one after being from top to bottom successively arranged one respectively at water-cooling wall 2-1 below burner 12, be uniformly arranged fire air nozzle 15 before 2N group on the front wall of upper furnace 2, it is each before chimney arch Secondary Air bias eddy flow coal completely Powder burner respectively corresponds be provided with two groups before fire air nozzle 15, fire air nozzle 15 is from top to bottom inclined at before two groups On the front wall of upper furnace 2, fire air nozzle 16 after 2N group is uniformly arranged on the rear wall of upper furnace 2, each rear chimney arch Secondary Air Biasing vortex burner respectively corresponds completely be provided with two groups after fire air nozzle 16, fire air nozzle 16 is by upper after two groups It is inclined under on the rear wall of upper furnace 2.Injection is simultaneously step by step for inner second air and outer second air far from burner hearth center side It carries and is penetrated under thick coal culm air-flow, realize first, second grade of fractional combustion, penetrated under lack of gas wind injection breeze airflow and realize third fraction Grade burning encircles to penetrate under lower classification wind injection breeze airflow and realizes fourth stage fractional combustion, and high temperature breeze airflow is turned back 180 ° later It flowing up, forms W flame, breeze airflow continues uplink, and burnout degree introduces burner hearth and realizes level V, the 6th grade of fractional combustion, The W flame boiler for being disposed with vortex burner on arch in this way realizes multi-ejection grading combustion.

Specific embodiment 2: illustrating present embodiment, a kind of use eddy flow coal described in present embodiment in conjunction with Fig. 1-Fig. 2 The multi-ejection of powder burner is classified W flame boiler, and it includes preceding primary that preceding chimney arch Secondary Air biases vortex burner completely Air hose 5, preceding inner second air pipe 6 and preceding outer second air pipe 7, preceding primary air piping 5, preceding inner second air pipe 6 and preceding outer second air pipe 7 are equal Before being vertically mounted on chimney arch 3, preceding outer second air pipe 7 and preceding 6 ecto-entad of inner second air pipe are successively sleeved on preceding primary air piping 5 On, the lateral wall of preceding primary air piping 5 is bonded with the inner sidewall of preceding inner second air pipe 6, and the lateral wall of preceding inner second air pipe 6 is with before The inner sidewall of outer second air pipe 7 is bonded, and preceding primary air piping 5 is arranged close to 2 front wall of upper furnace, and preceding outer second air pipe 7 is far from upper furnace The setting of 2 front wall of thorax, other compositions and connection relationship are same as the specific embodiment one.

Specific embodiment 3: embodiment is described with reference to Fig. 1, it is a kind of described in present embodiment to be fired using rotational flow coal dust The multi-ejection of burner is classified W flame boiler, and it includes rear primary air piping that rear chimney arch Secondary Air biases vortex burner completely 8, rear inner second air pipe 9 and rear outer second air pipe 4, rear primary air piping 8, rear inner second air pipe 9 and rear outer second air pipe 4 are vertical It being mounted on rear chimney arch 17, rear inner second air pipe 9 and rear 4 ecto-entad of outer second air pipe are sequentially sleeved on rear primary air piping 8, The lateral wall of primary air piping 8 is bonded with the inner sidewall of rear inner second air pipe 9 afterwards, the lateral wall of rear inner second air pipe 9 and rear outer two The inner sidewall of secondary air hose 4 is bonded, and rear primary air piping 8 wall after upper furnace 2 is arranged, after rear outer second air pipe 4 is far from upper furnace 2 Wall setting, other compositions and connection relationship are same as the specific embodiment one.

Specific embodiment 4: embodiment is described with reference to Fig. 1, it is a kind of described in present embodiment to be fired using rotational flow coal dust The multi-ejection of burner is classified W flame boiler, and preceding lack of gas wind snout 10 tilts down setting, multiple preceding lack of gas wind snouts 10 Center line is in the same plane, and the center line of each preceding lack of gas wind snout 10 and horizontal plane angulation are a, rear lack of gas Wind snout 13 tilts down setting, and the center line of multiple rear lack of gas wind snouts 13 is in the same plane, and each rear lack of gas wind The center line of spout 13 and horizontal plane angulation are b, and the numerical value of a and the numerical value of b are equal, the value range of b is 25 °- 45 °, the present invention in lack of gas wind wind rate be 8%-10%, it is other composition and connection relationship it is same as the specific embodiment one.

Specific embodiment 5: embodiment is described with reference to Fig. 1, it is a kind of described in present embodiment to be fired using rotational flow coal dust The multi-ejection of burner is classified W flame boiler, and preceding classification wind snout 11 tilts down setting, is classified wind snout 11 before multiple Center line is in the same plane, and the center line of each preceding classification wind snout 11 and horizontal plane angulation are c, rear classification Wind snout 12 tilts down setting, and the center line that wind snout 12 is classified after multiple is in the same plane, and each rear classification wind The center line of spout 12 and horizontal plane angulation are d, and the numerical value of c and the numerical value of d are equal, the value range of d is 25 °- 45 °, the present invention in classification wind wind rate be 13%-20%, it is other composition and connection relationship it is same as the specific embodiment one.

Specific embodiment 6: embodiment is described with reference to Fig. 1, it is a kind of described in present embodiment to be fired using rotational flow coal dust The multi-ejection of burner is classified W flame boiler, and each preceding chimney arch Secondary Air biases what vortex burner was correspondingly arranged completely The centerline parallel setting of two preceding fire air nozzles 15, and the center line of preceding fire air nozzle 15 and horizontal plane angulation For e, each rear chimney arch Secondary Air biases the center of fire air nozzle 16 after two that vortex burner is correspondingly arranged completely Line is arranged in parallel, and the center line of rear fire air nozzle 16 and horizontal plane angulation are f, the numerical value phase of the numerical value and f of e Deng the value range of e is that burnout degree wind rate is 18%-25% in 35 ° of -45 ° of present invention, other compositions and connection relationship and specific Embodiment one is identical.

Working principle

It is biased below vortex burner completely on the preceding chimney arch 3 of burner hearth from burner hearth central side to preceding chimney arch Secondary Air Arrange that multiple preceding chimney arch Secondary Airs bias vortex burner, and the rear chimney arch 17 in burner hearth completely between water-cooling wall 2-2 On rear chimney arch Secondary Air from burner hearth central side to burner hearth bias arranged between water-cooling wall 2-1 below vortex burner completely Chimney arch Secondary Air biases vortex burner, the spiral-flow powdered coal burning that the present invention uses Secondary Air to bias completely completely after multiple Device, preceding inner second air pipe 6 and preceding outer second air pipe 7 are deviated relative to preceding primary air piping 5 to far from burner hearth center side, and rear interior two Secondary air hose 9 and rear outer second air pipe 4 are deviated relative to rear primary air piping 8 to far from burner hearth center side, and it is complete to form Secondary Air Biasing.First air in preceding primary air piping 5 and rear primary air piping 8 carries thick coal culm and enters in lower hearth 1, far from burner hearth center Preceding inner second air pipe 6 and rear inner second air pipe 9 and preceding outer second air pipe 7 and rear outer second air pipe 4 injection and carry dense step by step It is penetrated under breeze airflow, realizes first, second grade of fractional combustion, the premenstrual lack of gas wind snout 10 of lack of gas wind and rear lack of gas wind snout 13 Further injection breeze airflow downlink, realizes third level fractional combustion, encircles lower classification wind and is classified wind snout 11 and rear classification before menstruation Wind snout 12 enters in lower hearth 1, further injection breeze airflow downlink, realizes fourth stage fractional combustion, later high temperature coal dust Air-flow is turned back 180 ° and is flowed up, and W flame is formed, and breeze airflow continues uplink, the premenstrual fire air nozzle 15 of burnout degree and after-burning Wind snout 16 enters in burner hearth to the greatest extent, realizes level V, the 6th grade of fractional combustion.It can guarantee that breeze airflow exists in this way Lower hearth have it is enough under penetrate depth, reduce NO while improving burn-off ratexGeneration.

Application example of the invention: this example carries out a 300MW W flame boiler using vortex burner Industrial field.When using former combustion system, it is 3.2m, heat that cold conditions tracer test, which measures burner primary air undershoot depth, State test measures breeze airflow and catches fire in the position away from burner nozzle 1.3m, boiler NOxDischarge amount 1300mg/m3, flying dust is flammable Object content 11%, boiler at full capacity when 1450 DEG C~1500 DEG C of temperature of primary zone.When using multi-ejection grading combustion of the present invention After system, it is 5.1m that cold conditions tracer test, which measures burner primary air undershoot depth, and hot test measures breeze airflow away from combustion The position of burner spout 0.5m catches fire, boiler NOxDischarge amount 760mg/m3, unburned combustible in fly ash 7.9%, boiler at full capacity when 1550 DEG C~1600 DEG C of primary zone temperature.Test result shows compared with former combustion system, is classified using multi-ejection of the present invention After combustion system, undershoot depth increases 1.9m, and breeze airflow shifts to an earlier date 0.8m kindling, NOxDischarge amount reduces 540mg/m3, fly Grey combustible content reduces 3.1 percentage points, and primary zone temperature increases 100 DEG C or so.

Claims (4)

1. a kind of multi-ejection using vortex burner is classified W flame boiler, it includes lower hearth (1), upper furnace (2), preceding chimney arch (3), rear chimney arch (17), N number of preceding chimney arch Secondary Air bias completely vortex burner, it is N number of after chimney arch it is secondary Wind biases vortex burner, N number of preceding lack of gas wind snout (10), N number of rear lack of gas wind snout (13), N number of preceding classification wind completely Spout (11) and it is N number of after be classified wind snout (12), it is characterised in that: after it further includes the preceding fire air nozzle (15) of 2N group and 2N group Fire air nozzle (16);It includes preceding primary air piping (5), preceding inner second air that preceding chimney arch Secondary Air biases vortex burner completely Manage (6) and preceding outer second air pipe (7), rear chimney arch Secondary Air bias completely vortex burner include rear primary air piping (8), after Inner second air pipe (9) and rear outer second air pipe (4), upper furnace (2), lower hearth (1), preceding chimney arch (3) and rear chimney arch (17) are constituted Burner hearth, N number of preceding chimney arch Secondary Air bias vortex burner completely and are uniformly arranged on preceding chimney arch (3), and N number of rear chimney arch is secondary Wind biases vortex burner completely and is uniformly arranged on rear chimney arch (17), and preceding chimney arch is secondary each of on preceding chimney arch (3) Wind biases vortex burner completely and biases rotational flow coal dust completely with chimney arch Secondary Air after one on rear chimney arch (17) respectively Burner is correspondingly arranged, it is each before chimney arch Secondary Air bias at vortex burner lower section water-cooling wall (2-2) completely respectively by Wind snout (11) are classified before being successively arranged a preceding lack of gas wind snout (10) and one under, each rear chimney arch Secondary Air is complete After being from top to bottom successively arranged one respectively at water-cooling wall (2-1) below biasing vortex burner lack of gas wind snout (13) and Wind snout (12) are classified after one, fire air nozzle (15) before 2N group, each forehearth have been uniformly arranged on the front wall of upper furnace (2) Arch Secondary Air bias completely vortex burner respectively correspond be provided with two groups before fire air nozzle (15), burnout degree before two groups Spout (15) is from top to bottom inclined on the front wall of upper furnace (2), after being uniformly arranged 2N group on the rear wall of upper furnace (2) Fire air nozzle (16), it is each after chimney arch Secondary Air bias completely vortex burner respectively correspond be provided with two groups after after-flame Wind snout (16), fire air nozzle (16) is from top to bottom inclined on the rear wall of upper furnace (2) after two groups, preceding primary air piping (5), preceding inner second air pipe (6) and preceding outer second air pipe (7) are vertically mounted on preceding chimney arch (3), preceding outer second air pipe (7) and Preceding inner second air pipe (6) ecto-entad is successively sleeved on preceding primary air piping (5), the lateral wall of preceding primary air piping (5) with it is preceding interior The inner sidewall of secondary air channel (6) is bonded, and the lateral wall of preceding inner second air pipe (6) is bonded with the inner sidewall of preceding outer second air pipe (7), Preceding primary air piping (5) is arranged close to upper furnace (2) front wall, and preceding outer second air pipe (7) is arranged far from upper furnace (2) front wall, latter Secondary air hose (8), rear inner second air pipe (9) and rear outer second air pipe (4) are vertically mounted on rear chimney arch (17), rear inner second air Pipe (9) and rear outer second air pipe (4) ecto-entad is sequentially sleeved on rear primary air piping (8), the lateral wall of rear primary air piping (8) It is bonded with the inner sidewall of rear inner second air pipe (9), the inside of the lateral wall of rear inner second air pipe (9) and rear outer second air pipe (4) Wall fitting, close to upper furnace (2), wall is arranged rear primary air piping (8) afterwards, and far from upper furnace (2), wall is set rear outer second air pipe (4) afterwards It sets.
2. a kind of multi-ejection using vortex burner is classified W flame boiler according to claim 1, feature exists In: preceding lack of gas wind snout (10) tilts down setting, and the center line of multiple preceding lack of gas wind snouts (10) is in the same plane, and The center line of lack of gas wind snout (10) and horizontal plane angulation are a before each, and rear lack of gas wind snout (13), which tilts down, to be set It sets, the center line of multiple rear lack of gas wind snouts (13) is in the same plane, and the center line of each rear lack of gas wind snout (13) It is b with horizontal plane angulation, the numerical value of a and the numerical value of b are equal, and the value range of b is 25 ° -45 °.
3. a kind of multi-ejection using vortex burner is classified W flame boiler according to claim 1, feature exists In: preceding classification wind snout (11) tilts down setting, and the center line that wind snout (11) are classified before multiple is in the same plane, and The center line and horizontal plane angulation of classification wind snout (11) are c before each, and classification wind snout (12), which tilts down, afterwards sets It sets, the center line that wind snout (12) are classified after multiple is in the same plane, and the center line of each rear classification wind snout (12) It is d with horizontal plane angulation, the numerical value of c and the numerical value of d are equal, and the value range of d is 25 ° -45 °.
4. a kind of multi-ejection using vortex burner is classified W flame boiler according to claim 1, feature exists In: chimney arch Secondary Air biases the center for two preceding fire air nozzles (15) that vortex burner is correspondingly arranged completely before each Line is arranged in parallel, and the center line of preceding fire air nozzle (15) and horizontal plane angulation are e, and each rear chimney arch Secondary Air is complete The centerline parallel setting of fire air nozzle (16) after complete two for biasing vortex burner and being correspondingly arranged, and rear burnout degree The center line of spout (16) and horizontal plane angulation are f, and the numerical value of e and the numerical value of f are equal, the value range of e is 35 °- 45°。
CN201610949784.1A 2016-10-26 2016-10-26 A kind of multi-ejection classification W flame boiler using vortex burner CN106524137B (en)

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CN105423294A (en) * 2015-12-28 2016-03-23 哈尔滨工业大学 Secondary air offset whirl pulverized coal burner for W flame boiler
CN105546521A (en) * 2015-12-28 2016-05-04 哈尔滨工业大学 W-flame boiler with rotational flow pulverized coal burners with primary air and secondary air eccentrically arranged

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JPH01200106A (en) * 1988-02-04 1989-08-11 Babcock Hitachi Kk Method and device of feeding combustion air
JPH0268403A (en) * 1988-09-02 1990-03-07 Babcock Hitachi Kk Solid fuel burner
CN101476739A (en) * 2009-01-21 2009-07-08 哈尔滨工业大学 W-shaped flame boiler with two-stage over-fire wind
CN101832549A (en) * 2010-04-19 2010-09-15 哈尔滨工业大学 Multi-ejection grading combustion method and W flame boiler device for realizing same
CN105423294A (en) * 2015-12-28 2016-03-23 哈尔滨工业大学 Secondary air offset whirl pulverized coal burner for W flame boiler
CN105546521A (en) * 2015-12-28 2016-05-04 哈尔滨工业大学 W-flame boiler with rotational flow pulverized coal burners with primary air and secondary air eccentrically arranged

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