CN106765063A - A kind of Secondary Air is classified burning boiler - Google Patents
A kind of Secondary Air is classified burning boiler Download PDFInfo
- Publication number
- CN106765063A CN106765063A CN201611108196.1A CN201611108196A CN106765063A CN 106765063 A CN106765063 A CN 106765063A CN 201611108196 A CN201611108196 A CN 201611108196A CN 106765063 A CN106765063 A CN 106765063A
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- Prior art keywords
- air
- secondary air
- wall
- nozzle
- angle
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/02—Disposition of air supply not passing through burner
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
Abstract
A kind of Secondary Air is classified burning boiler, belongs to power station four walls tangential burning boiler, solves the problems, such as that existing four walls tangential burning boiler secondary air is too strong to First air Involving velocity, horizontal direction air classification degree is inadequate.The present invention is equipped with the First air and overfire air jet being alternately arranged along longitudinal direction respectively on the forward and backward of boiler body, left and right wall, in the rectangular closed space corner formed by forward and backward, left and right wall, longitudinally arranged Secondary Air angle nozzle is respectively equipped with, its secondary air flow for spraying accounts for the 10%~40% of total secondary air flow.The present invention can strengthen the air classification degree of horizontal direction, reduce excess air coefficient of the coal dust at the burning initial stage, and further the generation of containment NOx, reduces NOx emission；Involving velocity of the Secondary Air to primary wind and powder can also be mitigated, flame impingement water-cooling wall is prevented, while the secondary wind energy of lower temperature forms a layer of air film, the protective effect to water-cooling wall is played.
Description
Technical field
The invention belongs to power station four walls tangential burning boiler, and in particular to a kind of Secondary Air horizontal direction fractional combustion pot
Stove.
Background technology
World's coal total output is 78.61 hundred million tons within 2015, and 4% was declined than 2014, and it is total that Chinese coal yield accounts for the world
The 47.7% of yield, 0.5% was risen compared to 2014, and coal is still the main source of China's energy, wherein, 46% coal
Charcoal is used for thermal power generation.At present, coal in China is generated electricity and accounts for 75% of gross generation or so, and 28% is higher by than world level.
Coal can produce various pollutants, wherein harm of the nitrogen oxides (NOx) to environment and human body in combustion
Especially pronounced, NOx is combined with the water in air eventually change into nitric acid and nitrate and then formation acid rain；NOx is inhaled by human body
Respiratory tract can be endangered after entering to give rise to diseases；NOx can produce photochemical pollution under certain condition with other pollutants；
NOx can damage the ozone layer and cause greenhouse effects.The NOx abatement of fired power generating unit is extremely urgent task.
Current coal-burning power plant controls the mainstream technology of NOx emission to be taken off in denitration (gas denitrifying technology) and burning after burning
Nitre (low NOx combusting technology).
Gas denitrifying technology original NOx content reduced in flue gas by the absorption to NOx in flue gas and also, according to principle
Difference be divided into SCR technology (SCR) and SNCR technology (SNCR).SNCR denitration efficiency exists
25% to 50%, less efficient, reducing agent consumption is big, general seldom individually to use.Compared with SNCR, SCR has very high
Denitration efficiency (more than 90%) and device are simple, be easy to safeguard, are widely used in the whole world.But SCR is to flue-gas temperature area
Between require, initial outlay high cost, service life is short.
Low NOx combusting technology is the formation mechanism according to NOx in combustion process, burning situation and combustion inside adjustment burner hearth
Burning process, is reduced the growing amount of the NOx of fuel or the NOx for having generated is reduced using the combustion product of reproducibility.It is conventional at present
Low NOx combusting technology mainly have the skills such as low-NOx combustor, low oxygen combustion, fuel staging, air classification and flue gas recirculation
Art.Wherein air classification technology is widely used in the NOx emission control of coal unit because effect is obvious, cost is relatively low.
Air classification technology is divided into vertical direction air classification and horizontal direction air classification.
Shown in existing tangential-fired furnace boiler such as Fig. 1 (a), Fig. 1 (b), including boiler body 1, the cross section of boiler body 1 is
Rectangle, rectangular closed space, front wall 1A, rear wall 1B, left wall 1C and the right side are formed by front wall 1A, rear wall 1B, left wall 1C and right wall 1D
It is equipped with along the First air nozzle 2 that is alternately arranged of longitudinal direction and overfire air jet 3 that (Fig. 1 (a) only indicates a certain wall on wall 1D respectively
First air nozzle 2 and its neighbouring overfire air jet 3)；The front wall 1A, rear wall 1B, left wall 1C and edge on right wall 1D
First air nozzle 2 and the top of overfire air jet 3 that longitudinal direction is alternately arranged, can be provided with burnout degree nozzle 5 respectively.
In the combustion process of existing tangential-fired furnace boiler, vertical direction air classification refers to by First air and the total wind of Secondary Air
The 70~90% of amount spray into primary zone by First air nozzle and overfire air jet, and the excess air coefficient in primary zone is less than 1, shape
Into the burning situation of fuel-rich, the growing amount of NOx is effectively reduced.The 10%~30% of remaining total blast volume passes through burnout degree nozzle
Burner hearth is sprayed into Secondary Air form, the pulverized coal particle for uncombusted burns away；This mode is widely used and effect is obvious, but
Too high classification degree (burnout degree rate) can cause the increase of furnace outlet unburned carbon in flue dust, boiler efficiency reduction, thus Vertical Square
There is limitation to air classification control NOx emission.
Horizontal direction air classification refers to then that the incident angle of part Secondary Air has deviation with the angle of First air, is such as schemed
Shown in 1 (b), secondary air separating is two parts, and a part is identical with the incident angle of First air；Remaining part is formed with First air
Biasing, with once eolian γ angles, (0 °≤γ≤25 °), direction of rotation is identical, and the actual circle of contact that the part Secondary Air is formed is more than
The actual circle of contact of First air, forms the combustion system of bellows chamber powder, and the combustion system delays the mixing of primary wind and powder and Secondary Air,
Reduce the NOx generation amount at burning initial stage.Part biasing Secondary Air can also play the effect of air classification and protection water-cooling wall,
But the part Secondary Air and First air inject burner hearth from wall spout, and angle of eccentricity is restricted, it is impossible to deflect excessive, air point
It is in small distance between stage and spout, additionally, the wind speed of Secondary Air and wind rate are apparently higher than First air, its volume to First air
Suction effect also clearly, frequently can lead to First air air-flow and produce deflection and wash away water-cooling wall, cause wall-cooling surface overtemperature, corruption
The problems such as erosion, slagging scorification, occurs.
The content of the invention
The present invention provides a kind of Secondary Air classification burning boiler, solves existing four walls tangential burning boiler secondary air to once
The problem that wind powder Involving velocity is too strong, horizontal direction air classification degree is inadequate, deepens horizontal direction air classification degree to drop
Low NOx drainage and mitigation First air deflection.
A kind of Secondary Air classification burning boiler provided by the present invention, including boiler body, the cross section of boiler body is
Rectangle, rectangular closed space is formed by front wall, Hou Qiang, Zuo Qiang and right wall, is equipped with respectively on front wall, Hou Qiang, Zuo Qiang and right wall
Along First air airflow direction and First air that First air nozzle and overfire air jet that longitudinal direction is alternately arranged, First air nozzle spray
Wall where nozzle is at an angle β, β≤90 °, it is characterised in that：
In the rectangular closed space corner formed by front wall, Hou Qiang, Zuo Qiang and right wall, longitudinally arranged two are respectively equipped with
Secondary wind angle nozzle, its secondary air flow for spraying accounts for the 10%~40% of total secondary air flow；
The Secondary Air airflow direction that Secondary Air angle nozzle sprays is at an angle with the immediate wall of airflow downstream, α ＜ β.
The secondary air flow that Secondary Air angle nozzle sprays can be adjusted by changing the Secondary Air angle cross-section area of nozzle.
Described Secondary Air classification burning boiler, it is further characterized by：
First air nozzle and the overfire air jet top being alternately arranged along longitudinal direction on the front wall, Hou Qiang, Zuo Qiang and right wall,
Burnout degree nozzle is provided with respectively, and it is used to for the 10-30% of total blast volume to spray into burner hearth in Secondary Air form, plays depth empty
The effect of gas fractional combustion, so as to further reduce NO in stovexGeneration.
Described Secondary Air classification burning boiler, it is further characterised by：
50 °≤β≤90 °, 10 °≤α≤50 °.
Before the present invention keeps traditional tangential-fired furnace boiler, after, left, interlaced arrangement First air and Secondary Air spray on right four wall
The structure of mouth, realizes the air classification in vertical direction, meanwhile, Secondary Air angle nozzle is arranged on the corner of boiler, by 10%
Secondary Air to 40% sprays into burner hearth by the Secondary Air angle nozzle on corner, realizes the depth air classification in horizontal direction.
The Secondary Air airflow direction that Secondary Air angle nozzle sprays is at an angle with the immediate wall of airflow downstream, First air spray
The First air airflow direction that mouth sprays is at an angle β with wall where First air nozzle, and wherein α angles are less than β angles, so, in actual combustion
The circle of contact that angie type Secondary Air is formed during burning can be more than the circle of contact that primary wind and powder is formed, and reach depth air classification and protection water
The effect of cold wall.
Compared with prior art, Advantageous Effects of the present invention are embodied in：
(1) by 10~40% total Secondary Air allocation of the amount of air to the newly-installed Secondary Air angle nozzle positioned at burner hearth corner,
Secondary Air sprays into burner hearth simultaneously by wall overfire air jet and Secondary Air angle nozzle, and this Secondary Air method of salary distribution can strengthen coal
The air at powder burning initial stage classification degree in the horizontal direction, postpones the mixing of coal dust and Secondary Air, effectively suppresses burning just
Phase NOxGeneration, realize low NOxDischarge.
(2) existing four walls tangential burning boiler whole Secondary Air sprays into burner hearth, secondary wind facies by wall overfire air jet
More larger than in First air wind rate, the larger Secondary Air of momentum has Involving velocity to primary wind and powder, causes eccentricity of fire in water-cooling wall
Direction, flame causes water-cooling wall overtemperature, slagging scorification or corrosion to washing away for water-cooling wall.By contrast, it is of the invention by total secondary air flow
10% to 40% burner hearth is sprayed into by the Secondary Air angle nozzle of burner hearth corner, reduce the Secondary Air momentum of each spout, together
When the secondary general mood incident angle α that sprays less than First air incident angle β, bigger angle of eccentricity weakens Secondary Air to First air
Involving velocity, thus substantially reduce the trend of flame impingement water-cooling wall, at the same can water-cooling wall be formed about one layer it is oxygen-enriched
The protection air film of atmosphere, can effectively prevent breeze airflow from producing larger deflection and washing away water-cooling wall, prevent water-cooling wall overtemperature, knot
Slag and corrosion.
Brief description of the drawings
Fig. 1 (a) is existing Process In A Tangential Firing front view；
Fig. 1 (b) is the top view of Fig. 1 (a), and wherein First air incident angle is β, and secondary air separating is two parts, a part
It is blow-through wind, identical with First air angle beta, another part Secondary Air compares First air deflection angle γ；
Fig. 2 (a) is front view of the invention；
Fig. 2 (b) is top view of the invention.
Specific embodiment
Below in conjunction with drawings and Examples, the present invention is described in more detail.
As shown in Fig. 2 (a), Fig. 2 (b), the present invention includes boiler body 1, and the cross section of boiler body 1 is rectangle, by preceding
Wall 1A, rear wall 1B, left wall 1C and right wall 1D form rectangular closed space, on front wall 1A, rear wall 1B, left wall 1C and right wall 1D respectively
It is equipped with the First air nozzle 2 and overfire air jet 3 being alternately arranged along longitudinal direction, the First air air-flow side that First air nozzle 2 sprays
To at an angle β, β≤90 ° with wall where First air nozzle；
In the rectangular closed space corner formed by front wall 1A, rear wall 1B, left wall 1C and right wall 1D, it is respectively equipped with along longitudinal direction
The Secondary Air angle nozzle 4 of arrangement, its secondary air flow for spraying accounts for the 10%~40% of total secondary air flow；Secondary Air angle nozzle
The 4 Secondary Air airflow directions for spraying are at an angle with the immediate wall of airflow downstream, α ＜ β.
Imaginary circle of the imaginary circle that the Secondary Air air-flow that Secondary Air angle nozzle 4 sprays is formed slightly larger than First air.Two
Secondary wind angle nozzle 4 is located at burner hearth corner, and First air nozzle is located at the wall of burner hearth four, distant, biasing of the Secondary Air to First air
Weaken with coal dust Involving velocity, and the Secondary Air incident angle accommodative facility that Secondary Air angle nozzle sprays is big, it is thus possible to it is big
The big mixing for postponing primary and secondary air, reduces coal dust firing initial stage stoichiometric ratio, suppresses NOxGeneration, while formed one layer of gas
Film protects water-cooling wall, prevents water-cooling wall overtemperature, pre- Anti-slagging and corrosion.In actual moving process, can be adjusted by controller
The incident angle α of the Secondary Air that Secondary Air angle nozzle sprays is reaching preferable operational effect.
During using the present invention, existing tangential-fired furnace boiler can be transformed, keep the First air spray of the wall of body four
Mouth and overfire air jet position are constant, it is only necessary to reduce the discharge area of four wall overfire air jets, and Secondary Air is increased in burner hearth corner
Angle nozzle.
As embodiment, be alternately arranged along longitudinal direction is equipped with front wall 1A, rear wall 1B, left wall 1C and right wall 1D respectively
Secondary wind nozzle 2 and overfire air jet 3, First air nozzle are 5, and overfire air jet is 6；
First air incident direction is general between 50 °~90 °, and the Secondary Air airflow direction that Secondary Air angle nozzle sprays exists
Between 10 °~50 °.
The First air nozzle 2 and Secondary Air being alternately arranged along longitudinal direction on the front wall 1A, rear wall 1B, left wall 1C and right wall 1D
The top of nozzle 3, can be provided with burnout degree nozzle 5 respectively, and it is used to spray the 10%-30% of total blast volume in Secondary Air form
Enter burner hearth, play a part of depth Researched of Air Staging Combustion Burning Pulverized Coal, so as to further reduce NO in stovexGeneration.
Claims (3)
1. a kind of Secondary Air classification burning boiler, including boiler body (1), the cross section of boiler body (1) is rectangle, by front wall
(1A), rear wall (1B), left wall (1C) He Youqiang (1D) form rectangular closed space, front wall (1A), rear wall (1B), left wall (1C) and
The First air nozzle (2) and overfire air jet (3) being alternately arranged along longitudinal direction, First air nozzle are equipped with right wall (1D) respectively
(2) the First air airflow direction for spraying is at an angle β with wall where First air nozzle, β≤90 °, it is characterised in that：
In the rectangular closed space corner formed by front wall (1A), rear wall (1B), left wall (1C) He Youqiang (1D), edge is respectively equipped with
Secondary Air angle nozzle (4) being longitudinally arranged, its secondary air flow for spraying accounts for the 10%~40% of total secondary air flow；It is described
The Secondary Air airflow direction that Secondary Air angle nozzle (4) sprays is at an angle with the immediate wall of airflow downstream, α ＜ β.
2. Secondary Air as claimed in claim 1 is classified burning boiler, it is characterised in that：
The front wall (1A), rear wall (1B), the First air nozzle (2) being alternately arranged along longitudinal direction on left wall (1C) He Youqiang (1D) and
Overfire air jet (3) top, is provided with burnout degree nozzle (5) respectively, and it is used for the 10%-30% by total blast volume with Secondary Air
Form sprays into burner hearth, plays a part of depth Researched of Air Staging Combustion Burning Pulverized Coal, so as to further reduce NO in stovexGeneration.
3. Secondary Air as claimed in claim 1 or 2 is classified burning boiler, it is characterised in that：
50 °≤β≤90 °, 10 °≤α≤50 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611108196.1A CN106765063A (en) | 2016-12-06 | 2016-12-06 | A kind of Secondary Air is classified burning boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611108196.1A CN106765063A (en) | 2016-12-06 | 2016-12-06 | A kind of Secondary Air is classified burning boiler |
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| Publication Number | Publication Date |
|---|---|
| CN106765063A true CN106765063A (en) | 2017-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611108196.1A Pending CN106765063A (en) | 2016-12-06 | 2016-12-06 | A kind of Secondary Air is classified burning boiler |
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| CN (1) | CN106765063A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107620967A (en) * | 2017-10-13 | 2018-01-23 | 浙江旺能环保有限公司 | A kind of burner hearth cloth wind structure for suppressing carbon monoxide generation |
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|---|---|---|---|---|
| JPH02197710A (en) * | 1989-01-25 | 1990-08-06 | Mitsubishi Heavy Ind Ltd | Burner blowing into melting furnace of swirl type |
| EP0405294A2 (en) * | 1989-06-24 | 1991-01-02 | Balcke-Dürr AG | Device for combustion fuels in a combustion chamber |
| CN1959205A (en) * | 2006-11-30 | 2007-05-09 | 上海交通大学 | Combustion method of anthracite coal |
| CN101852429A (en) * | 2010-06-29 | 2010-10-06 | 哈尔滨工业大学 | Wall-arranged direct-flow pulverized coal combustion device with side secondary air |
| US20140308620A1 (en) * | 2012-07-10 | 2014-10-16 | Yantai Longyuan Power Technology Co., Ltd. | Pulverized coal fired boiler with wall-attachment secondary air and grid overfire air |
| CN204213911U (en) * | 2014-10-11 | 2015-03-18 | 贵州电力试验研究院 | The wall-tangential boiler structure of furnace outlet gas temperature deviation can be reduced |
| CN204358718U (en) * | 2014-12-28 | 2015-05-27 | 哈尔滨锅炉厂有限责任公司 | Wall-tangential firing coal powder fired boiler burner spout device |
| CN106090900A (en) * | 2016-05-31 | 2016-11-09 | 华中科技大学 | A kind of secondary wind low NO of wall deep-gradedxcombustion method and device |
-
2016
- 2016-12-06 CN CN201611108196.1A patent/CN106765063A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02197710A (en) * | 1989-01-25 | 1990-08-06 | Mitsubishi Heavy Ind Ltd | Burner blowing into melting furnace of swirl type |
| EP0405294A2 (en) * | 1989-06-24 | 1991-01-02 | Balcke-Dürr AG | Device for combustion fuels in a combustion chamber |
| CN1959205A (en) * | 2006-11-30 | 2007-05-09 | 上海交通大学 | Combustion method of anthracite coal |
| CN101852429A (en) * | 2010-06-29 | 2010-10-06 | 哈尔滨工业大学 | Wall-arranged direct-flow pulverized coal combustion device with side secondary air |
| US20140308620A1 (en) * | 2012-07-10 | 2014-10-16 | Yantai Longyuan Power Technology Co., Ltd. | Pulverized coal fired boiler with wall-attachment secondary air and grid overfire air |
| CN204213911U (en) * | 2014-10-11 | 2015-03-18 | 贵州电力试验研究院 | The wall-tangential boiler structure of furnace outlet gas temperature deviation can be reduced |
| CN204358718U (en) * | 2014-12-28 | 2015-05-27 | 哈尔滨锅炉厂有限责任公司 | Wall-tangential firing coal powder fired boiler burner spout device |
| CN106090900A (en) * | 2016-05-31 | 2016-11-09 | 华中科技大学 | A kind of secondary wind low NO of wall deep-gradedxcombustion method and device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107620967A (en) * | 2017-10-13 | 2018-01-23 | 浙江旺能环保有限公司 | A kind of burner hearth cloth wind structure for suppressing carbon monoxide generation |
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Application publication date: 20170531 |