CN2273374Y - Thick and thin wind pulverized coal burner - Google Patents
Thick and thin wind pulverized coal burner Download PDFInfo
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- CN2273374Y CN2273374Y CN 96245179 CN96245179U CN2273374Y CN 2273374 Y CN2273374 Y CN 2273374Y CN 96245179 CN96245179 CN 96245179 CN 96245179 U CN96245179 U CN 96245179U CN 2273374 Y CN2273374 Y CN 2273374Y
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Abstract
The utility model relates to a thick and thin wind pulverized coal burner, more specifically, behind primary wind pulverized coal concentrator, a thick pulverized coal air flow nozzle, a thin pulverized coal air flow fire mouth and a side secondary wind nozzle are orderly arranged from the toward fire side to the back fire side of the burner. The central lines thereof are in the same height and orderly and respectively form inclined angles alpha and beta. Thick and thin pulverized coal air flows formed after the primary wind flows through the pulverized coal concentrator and the side secondary wind are sprayed into a furnace chamber in the tangential direction along respective flow passages. A thick imaginary circle, a thin imaginary circle and a side secondary wind imaginary circle are formed orderly from inside to outside to carry out combustion. The five problems of high efficiency, stable combustion, slagging prevention, high temperature corrosion and low discharge of NOx for the combustion of pulverized coal can be solved simultaneously.
Description
The utility model relates to a kind of burner, specifically a kind of bias pulverized coal burner burner.It proposes at the tangential firing pulverized-coal fired boiler.
In power industry coal powder boiler combustion technology, common requirement is high efficiency, surely fire, prevent slagging scorification and high temperature corrosion and low pollution emission.At first, for effective use of energy sources, must guarantee high burning efficiency.Secondly, the fuel policy of China's steam coal is based on burning inferior coal, and the ature of coal of China descends to some extent in recent years, shows as ash content and increases, and calorific capacity reduces, and the flammability variation because the power plant soot ature of coal is changeable, makes stable combustion problem very outstanding again; Particularly the low-load combustion-stabilizing problem is more outstanding, usually has to throw and helps fuel oil in a large number, has increased cost of electricity-generating.Because ash content height in the coal, ash fusion point is often lower again, and adopts the reasons such as method of a wind nozzles centralized arrangement for overheavy firing, and the slagging scorification problem is quite general, influence the security and the economy of boiler operatiopn, even cause the badly damaged and human casualty accident of equipment.Sulfur content is higher right in coal, and the high temperature corrosion toward contact meeting generation primary zone furnace wall cooling injures the safety and the economical operation of boiler equally.One of important measures that strengthen combustion stability are to improve the combustion zone temperature levels, but this causes slagging scorification easily, influences boiler operation reliability, and will make NO
xDischarge capacity increases.In order to reduce NO
xDischarge capacity normally improves the coal powder density of a wind, postpone the mixing of primary and secondary air, but this is unfavorable for preventing slagging scorification and high temperature corrosion again, and can influences efficiency of combustion.Therefore, above-mentioned requirement to combustion technology is often conflicting.Chinese patent CN87106630 number, CN89200682 number disclosed burner, can only be from addressing the above problem in a certain respect, as latter's coal powder density burner that promptly makes a variation mainly is that the ducted concentration tube of utilize turning is divided into dense, light two strands in the horizontal direction to a wind, owing between deep or light two strands of jets, be provided with sandwichly mouthful, thereby do not have and reduce NO significantly
xThe effect of discharging.And for example Mitsubishi Heavy Ind. Ltd. (Mitsubishi Heavy Industries) adopts the elbow coal dust classifier in the PM burner, U.S. combustion enginnering company (Combustion Engineering Inc.) utilizes elbow in vertical direction a wind to be divided into dense, light two strands in the WR burner, in thick coal culm air-flow nozzles and thin powdered coal air-flow nozzles, spray in the burner hearth respectively, form vertical bias combustion.Though PM burner and WR burner have improved steady combustion and have reduced NO
xDischarging, but because the thick coal culm air-flow of high concentration directly towards water-cooling wall, can aggravate slagging scorification and high temperature corrosion problem on the contrary.The employing of Bian Bifeng can solve the high temperature corrosion problem of water-cooling wall, but is helpless to the solution of other problems, and it is bigger to implement difficulty.The side secondary air burner of traditional form also can be with solving slagging scorification and high temperature corrosion problem, but owing to must arrange the space that distance is very big between lateral second wind spout and wind nozzles, thereby on chamber structure is arranged, have very big difficulty.
The purpose of this utility model is the deficiency that exists at prior art, proposes a kind of concentrated type coal burner simple in structure, solve simultaneously coal dust firing high efficiency, surely fire, prevent the problem of slagging scorification and high temperature corrosion and five aspects of low pollution emission.
The utility model mainly comprises thick coal culm air-flow nozzles 3, thin powdered coal air-flow nozzles 4, lateral second wind spout 5 and boiler furnace 8.Among the figure, wind powder feeding pipes of 1-, 2-pulverized coal concentrator, 3-thick coal culm air-flow nozzles, 4-thin powdered coal air-flow nozzles, 5-lateral second wind spout, 6-secondary air duct (or secondary air box), 7-furnace wall cooling, 8-tangentially fired boiler burner hearth, 9-thick coal culm air-flow nozzles center line, 10-thin powdered coal air-flow nozzles center line, 11-lateral second wind spout center line, the dense imaginary circle of 12-, the light imaginary circle of 13-, 14-side secondary air imaginary circle.The main points of utility model are, successively arrange thick coal culm air-flow nozzles 3, thin powdered coal air-flow nozzles 4 and lateral second wind spout 5 from the side of waring oneself in front of a fire to back-fire side at a wind nozzles place of each burner of tangentially fired combustion chamber; Three's center line and is in identical absolute altitude in exit separately at grade; Angle between the center line of the center line of thick coal culm air-flow nozzles 3 and thin powdered coal air-flow nozzles 4 is α, and the angle between the center line of thin powdered coal air-flow nozzles 4 and the center line of lateral second wind spout 5 is β.Here-20 °≤α≤20 °.-10°≤β≤10°。The center line of the thick coal culm air-flow nozzles 3 of each burner forms dense imaginary circle 12 in burner hearth 8, the center line of the thin powdered coal air-flow nozzles 4 of each burner forms the lateral second wind spout 5 of light imaginary circle 13, each burner in burner hearth 8 center line forms side secondary air imaginary circle 14 in burner hearth 8.The direction of rotation of above-mentioned three imaginary circles can be identical, also can be different; The diameter of three imaginary circles can be different also identical; The diameter of imaginary circle also can be zero, and promptly these nozzles (or spout) are taked the arrangement that liquidates.Above-mentioned angle [alpha] and β, the form of the selected and pulverized coal preparation system of the direction of rotation of imaginary circle and diameter, the capacity of boiler, the shape of boiler furnace and thermal parameter, the combustion characteristics that uses coal and ash melting characteristic, the design parameter of burner (as wind rate, wind speed, wind-warm syndrome) and architectural feature etc. are relevant, should determine according to concrete operating position.
The course of work of the present utility model and principle are: coal dust is carried by a wind through powder feeding pipes 1, form a so-called wind breeze airflow, after one time the wind breeze airflow flows through the pulverized coal concentrator 2 that is installed between powder feeding pipes 1 and the burner, form very big two strands of breeze airflows-thick coal culm air-flow and the thin powdered coal air-flow of concentration difference.The coal dust amount of thick coal culm air-flow accounts for the major part of coal dust total amount in wind, and the coal dust amount of thin powdered coal air-flow only accounts for the small part of coal dust total amount in wind.The thick coal culm air-flow enters thick coal culm air-flow nozzles 3 through the dense outlet of pulverized coal concentrator 2, tangentially sprays in the burner hearth 8 in the side of waring oneself in front of a fire, form dense imaginary circle 12, part secondary wind tangentially sprays in the burner hearth 8 at back-fire side through lateral second wind spout 5, forms side secondary air imaginary circle 14.The thin powdered coal air flow stream is crossed the mouth that fades out of pulverized coal concentrator 2, enters thin powdered coal air-flow nozzles 4, tangentially sprays in the burner hearth 8 at the thick coal culm air-flow of the side of waring oneself in front of a fire and the side secondary air centre of back-fire side.Because thick coal culm air-flow nozzles 3, thin powdered coal air-flow nozzles 4 and lateral second wind spout 5 are in turn arranged to back-fire side from the side of waring oneself in front of a fire, thick coal culm air-flow, thin powdered coal air-flow and side secondary air are also in turn spraying into burner hearth from the side of waring oneself in front of a fire to the position of back-fire side, form the flame of thick coal culm air-flow in the fireball in burner hearth from inside to outside, the flame of thin powdered coal gas and side secondary air surrounding layer, Here it is has the horizontal bias combustion system of side secondary air.
The gas-powder ratio of thick coal culm air-flow is hypoxemia, fuel-rich combustion much smaller than the stoichiometric ratio of fuel combustion; The gas-powder ratio of thin powdered coal air-flow is approaching or surpass the stoichiometric ratio of burning, and adds the effect of side secondary air, forms oxygen-enriched combusting.Coal powder density height in the thick coal culm air-flow, the required ignition heat of coal dust reduces, and coal dust catches fire easily; Coal powder density has improved, the ignition temperature of coal dust reduces, and promptly coal dust can catch fire under lower temperature, the thick coal culm air-flow layout of waring oneself in front of a fire, the adjacent angle flame that directly entrainments the upstream has formed high-temperature flue gas, make the thick coal culm air-flow in time promptly catch fire, improved the stability of coal powder ignition, because the coal powder density height in the thick coal culm air-flow, gas-powder ratio is less than the stoichiometric ratio of fuel, coal dust is in the hypoxemia fuel-rich combustion, includes oxidation in the initial reaction district of combustion reaction and contains thing (O, O
2, OH etc.) concentration ratio lower.The big portion of the NO that coal dust firing generated is fuel type NO, and major part wherein is again to form at the initial stage of combustion reaction.Coal is when burning, and fuel bound nitrogen almost all is decomposed to form middle product such as HCN, N, CH, NH rapidly
1Deng.In the combustion process of thick coal culm air-flow, because the concentration ratio of oxygenatedchemicals is lower, these intermediate products can not be oxidized to product NO, but with NO reduction reaction take place, and generate N
2Said process has suppressed the generation of fuel type NO widely.Simultaneously, because ignition process improves, the temperature of combustion zone raises, thereby improved the output separated out of fugitive constituent in the coal dust, further reduce the concentration of oxygenatedchemicals, strengthened the reduction reaction of NO, thereby reduced the growing amount of NO, therefore, the employing of shading technique has reduced the discharging of NO in the process of coal combustion widely.After the thick coal culm air-flow catches fire, the thin powdered coal air-flow is sneaked in good time, replenish the necessary oxygen amount of coal dust firing, primary air ratio in deep or light two strands of breeze airflows is identical with normal burner, side secondary air is also in time sneaked into after a light wind is sneaked into the thick coal culm air-flow, and further the delivery of supplemental oxygen amount adds the raising of combustion zone temperature, catching fire causes the factor of the increase of the time of staying in high-temperature area in advance, makes total efficiency of combustion be higher than conventional coal burner.Most of coal dust sprays into burner hearth by thick coal culm air-flow nozzles, concentrate on the internal-combustion of fireball, thin powdered coal air-flow and side secondary air spray into burner hearth at the back-fire side of thick coal culm air-flow, form the air screen of the low coal powder density oxygen enrichment of one deck in the outside of fireball, the thick coal culm air-flow flame of rich fuel is wrapped in inside.This not only separates carbon granule, soot particle and the water-cooling wall of a coal dust material and their formation, reduce these particles and be thrown to chance on the water-cooling wall, and formed stronger oxidizing atmosphere zone at the water-cooling wall near zone, improve fusion point of ash, avoid soot particle to be in having adhering molten, further reduce these particles and adhere to possibility on the water-cooling wall (or wall with refractory lining, refracto) every state.Therefore, the horizontal bias combustion technology combines with side secondary air, can avoid taking place serious slagging scorification phenomenon.Because the water-cooling wall near zone is oxidizing atmosphere, even use sulphur coal, also can not form H2S etc. and have corrosive reducing gas at the water-cooling wall near surface, avoid the corrosion of water-cooling wall metal generation high-temperature.
The utility model compared with prior art, structure that is adopted and principle thereof, both solved the aforementioned indeterminable slagging scorification problem of deep or light two strands of breeze airflows that is arranged vertically, overcome aforementioned variation coal powder density burner again and can not significantly reduce the NO discharging, and it is bad to work as the burner hearth condition, the deficiency that sulfur-bearing is many in the coal, ash fusion point can not effectively solve slagging scorification and water wall high temperature corrosion when low.Both overcome the difficulty of side secondary air type burner on structural configuration, on the basis of horizontal bias burning, strengthened the effect that prevents slagging scorification and water wall high temperature corrosion again.The coal burner of this structure can solve efficient, the steady combustion of coal dust firing, anti-slagging scorification and high temperature corrosion and five subject matters of low NO discharging simultaneously, and very positive effect is played in the high-efficiency low-pollution utilization of colms such as the distinctive low volatile of China, high ash content, low heat value.The solution of slagging scorification and water wall high temperature corrosion problem will improve the security of pulverized-coal fired boiler operation greatly; The solution of stable combustion problem has improved the coal applicability of pulverized-coal fired boiler and the reliability of underrun; The solution that prevents slagging scorification and stable combustion problem will significantly reduce the tremendous economic loss that the accident blowing out is brought; Low NO
xThe solution of emission problem has reduced atmosphere pollution, and the protection environment for human survival has great social significance and economic implications to the low pollution utilization of coal; Efficient combustion can improve rate of energy, has saved the energy.
Fig. 1 is the utility model principle assumption diagram.
Embodiment:
In the coal-powder boiler of certain 75t/h combustion meager coal, implement design ature of coal V
Dar=15%, Q
Ner, ar=20000kJ/kg.The burner hearth cross sectional dimensions is 5450mm * 5450mm.Secondary wind imaginary circle is counterclockwise rotation direction in the stove.Elegance thick coal culm air-flow nozzles, thin powdered coal air-flow nozzles and lateral second wind spout are arranged in juxtaposition, the three is the rectangle outlet, its size is respectively 72 * 270mm, 108 * 270mm and 45 * 270mm, between dense, the thin powdered coal air-flow nozzles is bluff body shape dividing plate, and wide at the place, outlet is 50mm; Be dull and stereotyped dividing plate between thin powdered coal air-flow nozzles and the side secondary air, thickness is 12mm, and whole burner nozzle adopts heat resisting cast steel to cast.
Claims (2)
1. bias pulverized coal burner burner, comprise thick coal culm air-flow nozzles [3], thin powdered coal air-flow nozzles [4], with tangentially fired boiler burner hearth [8], it is characterized in that being provided with thick coal culm air-flow nozzles [3] and thin powdered coal air-flow nozzles [4] in an air channel [1] and pulverized coal concentrator [2] back, be provided with lateral second wind spout [5] again in thin powdered coal air-flow nozzles [4] outside, the three is arranged into back-fire side from the side of waring oneself in front of a fire successively, three's center line is in same plane, be positioned at identical absolute altitude in separately outlet, form angle α between thick coal culm air-flow nozzles center line and the thin powdered coal air-flow nozzles center line, form angle β between thin powdered coal air-flow nozzles center line and the lateral second wind spout center line.
2. burner according to claim 1 is characterized in that: the excursion of the angle α between thick coal culm air-flow nozzles center line and the thin powdered coal air-flow nozzles center line is in-20 °≤α≤20 °.The excursion-10 of angle β between thin powdered coal air-flow nozzles center line and the lateral second wind spout center line °≤β≤10 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96245179 CN2273374Y (en) | 1996-11-09 | 1996-11-09 | Thick and thin wind pulverized coal burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96245179 CN2273374Y (en) | 1996-11-09 | 1996-11-09 | Thick and thin wind pulverized coal burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2273374Y true CN2273374Y (en) | 1998-01-28 |
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ID=33918345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96245179 Expired - Fee Related CN2273374Y (en) | 1996-11-09 | 1996-11-09 | Thick and thin wind pulverized coal burner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2273374Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196146A (en) * | 2013-04-07 | 2013-07-10 | 山东大学 | Paper mill sludge combustion device and technique capable of preventing slag-bonding and corrosion of water walls |
| CN103672864A (en) * | 2013-12-31 | 2014-03-26 | 北京国电龙高科环境工程技术有限公司 | Upper-lower concentrated-diluted pulverized-coal burning device |
| CN103672885A (en) * | 2013-12-31 | 2014-03-26 | 北京国电龙高科环境工程技术有限公司 | Vertical thick and thin direct flow coal powder combustion device realizing primary air spray nozzle inside deflection |
| CN103697463A (en) * | 2013-12-31 | 2014-04-02 | 北京国电龙高科环境工程技术有限公司 | Up-and-down thick-and-thin primary air concentrated distribution type combustion device |
| CN105681098A (en) * | 2012-08-31 | 2016-06-15 | Lg电子株式会社 | Home appliance control method thereof |
| CN111237796A (en) * | 2020-02-28 | 2020-06-05 | 沈阳环境科学研究院 | High-efficient buggy concentrator of low energy consumption |
-
1996
- 1996-11-09 CN CN 96245179 patent/CN2273374Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105681098A (en) * | 2012-08-31 | 2016-06-15 | Lg电子株式会社 | Home appliance control method thereof |
| CN103196146A (en) * | 2013-04-07 | 2013-07-10 | 山东大学 | Paper mill sludge combustion device and technique capable of preventing slag-bonding and corrosion of water walls |
| CN103196146B (en) * | 2013-04-07 | 2015-08-12 | 山东大学 | A kind of paper mill sludge burner and technique preventing water-cooling wall slagging scorification and corrosion |
| CN103672864A (en) * | 2013-12-31 | 2014-03-26 | 北京国电龙高科环境工程技术有限公司 | Upper-lower concentrated-diluted pulverized-coal burning device |
| CN103672885A (en) * | 2013-12-31 | 2014-03-26 | 北京国电龙高科环境工程技术有限公司 | Vertical thick and thin direct flow coal powder combustion device realizing primary air spray nozzle inside deflection |
| CN103697463A (en) * | 2013-12-31 | 2014-04-02 | 北京国电龙高科环境工程技术有限公司 | Up-and-down thick-and-thin primary air concentrated distribution type combustion device |
| CN103697463B (en) * | 2013-12-31 | 2016-02-03 | 北京国电龙高科环境工程技术有限公司 | The burner of upper and lower deep or light First air centralized arrangement |
| CN103672864B (en) * | 2013-12-31 | 2016-05-11 | 北京国电龙高科环境工程技术有限公司 | A kind of upper and lower gradation coal burner |
| CN111237796A (en) * | 2020-02-28 | 2020-06-05 | 沈阳环境科学研究院 | High-efficient buggy concentrator of low energy consumption |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |