CN201215311Y - Adjustable bias jet DC coal burner - Google Patents
Adjustable bias jet DC coal burner Download PDFInfo
- Publication number
- CN201215311Y CN201215311Y CN 200820021651 CN200820021651U CN201215311Y CN 201215311 Y CN201215311 Y CN 201215311Y CN 200820021651 CN200820021651 CN 200820021651 CN 200820021651 U CN200820021651 U CN 200820021651U CN 201215311 Y CN201215311 Y CN 201215311Y
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- China
- Prior art keywords
- burner
- combustion chamber
- coal
- jet
- coal burner
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 239000003245 coal Substances 0.000 title claims abstract description 46
- 238000002485 combustion reaction Methods 0.000 claims abstract description 38
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 17
- 239000002802 bituminous coal Substances 0.000 description 9
- 238000004939 coking Methods 0.000 description 8
- 239000002817 coal dust Substances 0.000 description 6
- 210000001624 hip Anatomy 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 230000003134 recirculating effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses an adjustable nonsymmetrical jet direct-flow pulverized coal burner, which resolves the problem that the existing boiler direct-flow and pre-combustion chamber type pulverized coal burner has complex structure, is easy to be damaged, and affects normal production and the like. The adjustable nonsymmetrical jet direct-flow pulverized coal burner is structurally characterized by comprising a combustion chamber, the lower portion of the combustion chamber is a primary airway, an adjustable baffle is arranged at the port of the primary airway, and a cooling air box and a cooling air nozzle are arranged above the primary airway inside the combustion chamber. The utility model has the advantages of simple structure, convenient usage, long service life, fine stability, effectively reducing NOx emission and the like.
Description
Technical field
The utility model relates to a kind of coal powder burner, relates in particular to a kind of adjustable offset jet straight-through pulverized coal burner.
Background technology
The station boiler that China is present mainly is to use meager coal and bituminous coal.According to these coals with at reducing the boiler combustion fly ash combustible material, not throwing problems such as oily low-load combustion-stabilizing, coal dust direct-fire, small oil gun igniting, burners such as tubular pre-combustion chamber burner, binary channels burner, offset jet burner, plasma coal dust start-up burner, type of small oil gun burner, shade burner, ship shape bluff body are developed, use and developed to domestic priority.More than except burners such as shade burner and ship shape bluff body, mostly be the band precombustion chamber coal burner.
Comprehensive each burner characteristic, station boiler direct current and its wind exit that enters precombustion chamber of precombustion chamber moulded coal powder burner all do not have volume adjusting apparatus at present as can be known, and the design of burner cools system also has their own characteristics each.
Tubular pre-combustion chamber burner design feature: a wind coal dust intermixture is to enter the tubular precombustion chamber by the cyclone in the airduct of burner precombustion chamber root.This pre-combustion chamber burner, will note the problem aspect following 4 when operation: (1) will be fineness of pulverized coal control in the reasonable scope, and bituminous coal R90 is 10%～20%; Meager coal R90 is 8%～12%.(2), bituminous coal is can be controlled in 0.25～0.50kg (powder)/kg (gas) with the control of wind powder flow quality concentration in the reasonable scope; Meager coal is can be controlled in 0.30～0.60kg (powder)/kg (gas).(3) primary wind and powder mixture temperature will be controlled at 130～200 ℃ for meager coal; Just passable for bituminous coal greater than 30 ℃.(4) ash content that will note raw coal is below 30%, and moisture is below 7%.The igniting capacity of this burner generally carries out designing and calculating by 20% of the actual Coal-fired capacity of boiler.
When this burner is used,, generally be arranged in overfiren air port place under four jiaos in the burner hearth to using the boiler of bituminous coal on pulverized-coal fired boiler; To the meager coal boiler, should can be arranged in down the overfiren air port place according to field condition, also can be arranged in both walls and front-back wall.This burner only is used for igniting like this, and does not use as main burner.
The main at present suitable 2 kinds of incendiary sources of this burner: a kind of is plasma flame flow, and power is about 50kW; A kind of is that little oil is robbed, and exerting oneself is 150kg/h.Use the burner of plasma flame flow as incendiary source, its ignition of the boiler rate of economizing gasoline is 100%.Using little oil to rob burner as incendiary source, is 50%～90% for its igniting rate of economizing gasoline of the boiler that uses bituminous coal.
This burner also can be used for boiler low load stable combustion, can not throw oily smooth combustion for the boiler that uses bituminous coal under 40% loading condiction; Can under 50% low load condition, not throw oily smooth combustion for the boiler that uses meager coal.
Find that in application in practice bituminous coal type pre-combustion chamber burner is successful, plasma flame flow and small oil gun all can be used as incendiary source, its coal dust after-flame degree height, and flameholding, the rate of economizing gasoline height is normally not present problems such as precombustion chamber accumulated powder, coking, scaling loss.For meager coal type pre-combustion chamber burner, changeable also inaccurate with design as coal, problems such as accumulated powder, coking, scaling loss often appear in precombustion chamber.With this simultaneously, find that also this burner should not work as main nozzles and use,, on boiler, arrange relatively more difficult because the profile of meager coal type pre-combustion chamber burner is bigger.
Binary channels burner structure characteristics are, respectively open 1 primary air nozzle in the upper and lower side of same rectangle precombustion chamber, have designed 1 backflow space like this between upper and lower primary air nozzle.The result that upper and lower primary air jet flows will produce strong recirculating zone.The momentum of these two strands of jets is very big, so its capacity of returns is very big, this heating to primary wind and powder, catch fire very favourable.For general ature of coal, utilize this backflow just to be enough to make flameholding.In both sides, air port next time 2 high-speed jet pipes are set, its flow velocity can be regulated between 0～velocity of sound, according to the requirement of different coals to catching fire, can change the thermal flue gas back flow by changing the flow of high-speed jet.For the higher coal of general volatile matter, can close high-speed jet, only depend on upper and lower two strands of primary air jets, the smoke backflow that self produces just is enough to make the primary wind and powder heating, catches fire and smooth combustion.But for the coal of low volatile, then high-speed jet should be opened.Make the overheated coking in two side in the precombustion chamber for fear of the hot reflux flue gas, added 2 strands of secondary wind, i.e. waist wind at two wall waists.
Find the advantage of this burner in the application in practice: (1) this burner is for the boiler that uses meager coal and meager coal inferior, and its smooth combustion performance is very good, can make these boilers under 45%～50% loading condiction, and it is stable not throw oil firing.(2) this burner is mixed flame passes flow-generator or small oil gun, can work as start-up burner usefulness, also can be used as the main burner operation.The igniting rate of economizing gasoline of joining the flame passes flow-generator is 100%, and the igniting rate of economizing gasoline of joining small oil gun is 50%～60%.
The shortcoming of this burner: (1) is very little to the accommodation that ature of coal changes, when the combustible basis volatile matter of going into the stove coal less than 8% the time, fly ash combustible material is higher, it surely fires ability drop, closes waist wind this moment and opens the bottom high-speed jet, then effect is little.When going into stove coal combustible basis volatile matter greater than 19%, when precombustion chamber design H and L are bigger than normal, this moment the precombustion chamber temperature drift, standard-sized sheet waist wind is lowered the temperature, and then effect is little, thereby makes precombustion chamber coking, scaling loss.After the distortion of precombustion chamber scaling loss, just cause wind powder gas stream burning aerodynamic field disorder in the burner hearth, upper furnace cigarette temperature is higher, causes problems such as superheater overtemperature.(2) when this burner uses the meager coal that volatile matter is higher and sulphur content is higher, its precombustion chamber outlet flame temperature is higher, easily causes water wall high temperature corrosion.(3) use the changeable boiler of bituminous coal and anthracite or ature of coal, should not adopt this burner.
Offset jet burner structure form is in the precombustion chamber of square-section, and the primary wind and powder power stream is offset to a distance of central axis below, and in the bottom one control jet is set.Primary air velocity is usually at 22～30m/s, and the speed of control jet is about 1 times of primary air velocity, because the momentum of primary wind and powder mixture jet is very big, has therefore just formed a very big recirculating zone on precombustion chamber top.The high-temperature flue gas of recirculating zone has formed a stable internal heat resource in precombustion chamber.By the mass transfer between air-flow, conducting heat provides coal powder ignition required heat, thereby guaranteed that fresh fuel burns continually and steadily.
Find the advantage of this burner in the application: (1) cooperates small oil gun, can make the ignition of the boiler rate of economizing gasoline reach 30%～50%.(2) boiler can not thrown oily smooth combustion under 45% loading condiction.The shortcoming of this burner: (1) one time the wind exit angle is partial to the precombustion chamber axis, and its structure is complicated, repacks main nozzles into, is difficult for arranging.(2) this burner is in the precombustion chamber of square-section, and the primary wind and powder power stream is offset to a distance of central axis below, and in the bottom one control jet is set.Slightly beneficial to preventing precombustion chamber bottom coking, scaling loss like this, but can not prevent coking, the scaling loss of precombustion chamber top and both sides.
Summary of the invention
The purpose of this utility model is exactly in order to solve present station boiler direct current and precombustion chamber moulded coal powder burner complex structure, fragile, influence is produced and problem such as normally to be carried out, provide a kind of have simple in structure, easy to use, life-span is long, and good stability effectively reduces the adjustable offset jet straight-through pulverized coal burner of advantages such as Nox discharging.
For achieving the above object, the utility model adopts following technical scheme:
A kind of adjustable offset jet straight-through pulverized coal burner, it comprises the combustion chamber, bottom, described combustion chamber is an air channel, is provided with fender plate at a wind passage mouth place, is provided with cool wind box and cooling air spout above an air channel in the combustion chamber.The combustion chamber is square.
This burner is compared with original burner, and its difference is: a wind of (1) above burner is respectively to enter precombustion chamber by cyclone, or 2 pipelines enter precombustion chamber about being divided into, and enter precombustion chamber besides at an angle.And a wind of novel burner is that straight horizontal taps into the bottom into the square-section precombustion chamber.Primary air jet passes through the precombustion chamber bottom with the speed of 23～28m/s, can prevent its bottom accumulated powder coking.(2) cancelled high-speed jet and the control jet that is similar to binary channels burner and offset jet burner.Make structure simpler like this.(3) the waist cooling air is changed into precombustion chamber internal upper part and both sides cooling air, can prevent precombustion chamber top and both sides coking and scaling loss.(4) at the place, a wind outlet that enters precombustion chamber, added 1 adjustable plate washer.Be used for regulating the outlet and the wind speed of a wind, adjust capacity of returns with this according to the ature of coal situation.
This burner should note in design following some: the length to height ratio of (1) precombustion chamber should be 1～1.5; Depth-width ratio is 1.0～1.4; Precombustion chamber height and a wind outlet aspect ratio are 1.8～3.0.(2) adjustable plate washers of wind, adjusting wind outlet scope that diminishes is 0～15% of former sectional area.
The beneficial effects of the utility model are:
1. the coal burner design can be adjusted burner breeze airflow entrance section.Breeze airflow enters the offset jet combustion chambers burn by fender plate, the effect of fender plate is the flow velocity that changes breeze airflow, parameters such as depth-width ratio, air force operating mode in the control offset jet combustion chamber, change the circulating flow strength and the backflow size of inside, combustion chamber, and then the reinforcement coal dust firing, reduce the Nox discharging.
2. the biasing of coal burner variable-area spout links to a square pulverized coal combustor.By parameter such as optimal control adjustable orifice cross section and combustion chamber length and width are dark, make this burner have coal applicability and stronger steady combustion performance widely.
3. burner makes burner have the good anti-performance of burning by optimizing the cooling air design.For adapting to the adjustable design of breeze airflow, optimized the burner surrounding air and introduced position and surrounding air physical dimension.Surrounding air design after the optimization possesses two functions: a pair of combustion chamber wall surface is forced cooling, ensures the burner security of operation; The 2nd, control the wind speed that enters in the combustion chamber by fender plate, and then adjust the air force operating mode in the combustion chamber, optimize burner combustion and emission status.
The operation characteristic of adjustable offset jet straight-through pulverized coal burner has:
1. realize that the coal dust jet moves the online adjustable of coal in conjunction with the scene, the coal applicability is wide;
2. the on-line optimization adjustment of air force operating mode in the realization coal burner makes burner surely fire performance and combines with the effective of long-time running;
3. by burner design and on-line optimization adjustment, can effectively reduce the burner operation troubles and take place, avoid burner to damage, and then improve boiler combustion efficiency, reduce boiler emission.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is the lateral plan of Fig. 1.
Wherein, 1. combustion chamber, 2. an air channel, 3. fender plate, 4. cool wind box, 5. cooling air passage.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
Among Fig. 1, Fig. 2, the bottom of square combustion chamber 1 is provided with air channel 2 one time, and 2 mouthfuls of places are provided with fender plate 3 in an air channel, and the top that 1 an inherent air channel, combustion chamber is 2 mouthfuls is provided with cool wind box 4 and cooling air spout.Cooling air enters burner by the cooling air passage 5 that is connected on the cool wind box 4.
Claims (2)
1. adjustable offset jet straight-through pulverized coal burner, it comprises the combustion chamber, it is characterized in that: bottom, described combustion chamber is an air channel, is provided with fender plate at a wind passage mouth place, is provided with cool wind box and cooling air spout above an air channel in the combustion chamber.
2. adjustable offset jet straight-through pulverized coal burner according to claim 1 is characterized in that: described combustion chamber is square.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200820021651 CN201215311Y (en) | 2008-04-30 | 2008-04-30 | Adjustable bias jet DC coal burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200820021651 CN201215311Y (en) | 2008-04-30 | 2008-04-30 | Adjustable bias jet DC coal burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201215311Y true CN201215311Y (en) | 2009-04-01 |
Family
ID=40520516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200820021651 Expired - Lifetime CN201215311Y (en) | 2008-04-30 | 2008-04-30 | Adjustable bias jet DC coal burner |
Country Status (1)
| Country | Link |
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| CN (1) | CN201215311Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705820A (en) * | 2012-06-29 | 2012-10-03 | 山东电力集团公司电力科学研究院 | Intelligent adaptive multi-coal type direct current pulverized coal combustion device |
| CN102809151A (en) * | 2012-08-23 | 2012-12-05 | 上海三融环保工程有限公司 | Oxygen-deficient combustion denitration combustor arranged in cement decomposing furnace |
| CN103175214A (en) * | 2013-04-09 | 2013-06-26 | 章礼道 | Natural gas ignition system with intelligent roller wheel type medium speed mill |
| CN103175215A (en) * | 2013-04-09 | 2013-06-26 | 章礼道 | Coal-fired boiler natural gas ignition system with low speed grind |
| CN111981474A (en) * | 2020-08-20 | 2020-11-24 | 长沙理工大学 | Jet flow deflection type low NOXBurner with a burner head |
-
2008
- 2008-04-30 CN CN 200820021651 patent/CN201215311Y/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705820A (en) * | 2012-06-29 | 2012-10-03 | 山东电力集团公司电力科学研究院 | Intelligent adaptive multi-coal type direct current pulverized coal combustion device |
| CN102705820B (en) * | 2012-06-29 | 2014-06-18 | 山东电力集团公司电力科学研究院 | Intelligent adaptive multi-coal type direct current pulverized coal combustion device |
| CN102809151A (en) * | 2012-08-23 | 2012-12-05 | 上海三融环保工程有限公司 | Oxygen-deficient combustion denitration combustor arranged in cement decomposing furnace |
| CN103175214A (en) * | 2013-04-09 | 2013-06-26 | 章礼道 | Natural gas ignition system with intelligent roller wheel type medium speed mill |
| CN103175215A (en) * | 2013-04-09 | 2013-06-26 | 章礼道 | Coal-fired boiler natural gas ignition system with low speed grind |
| CN103175215B (en) * | 2013-04-09 | 2015-11-25 | 章礼道 | Is furnished with the natural gas ignition system for coal burning boiler in generating plant of a low speed mill |
| CN103175214B (en) * | 2013-04-09 | 2016-03-30 | 章礼道 | Is furnished with the natural gas fired system of Intelligent roller type medium-speed pulverizer |
| CN111981474A (en) * | 2020-08-20 | 2020-11-24 | 长沙理工大学 | Jet flow deflection type low NOXBurner with a burner head |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE ELECTRIC NET CROP. Effective date: 20130312 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130312 Address after: 250002 Shandong Province, Ji'nan City Central Ring Road East Patentee after: Shandong Research Inst. of Electric Power Patentee after: State Grid Corporation of China Address before: 250002 Shandong Province, Ji'nan City Central Ring Road East Patentee before: Shandong Research Inst. of Electric Power |
|
| CX01 | Expiry of patent term |
Granted publication date: 20090401 |
|
| CX01 | Expiry of patent term |