CN203718766U - Classification strengthened low NOx pulverized coal combustor - Google Patents
Classification strengthened low NOx pulverized coal combustor Download PDFInfo
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- CN203718766U CN203718766U CN201420017276.6U CN201420017276U CN203718766U CN 203718766 U CN203718766 U CN 203718766U CN 201420017276 U CN201420017276 U CN 201420017276U CN 203718766 U CN203718766 U CN 203718766U
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Abstract
Disclosed is a classification strengthened low NOx pulverized coal combustor. The classification strengthened low NOx pulverized coal combustor comprises a primary air vent, a straight flow internal secondary air vent and a rotating flow internal secondary air vent, a pulverized coal equalizer and a pulverized coal separator which are arranged inside the primary air vent separate pulverized coal at the spray nozzle into an inside-concentration and outside-dilution structure and spray the pulverized coal into a furnace chamber; internal secondary air is composed of straight flow air and rotating flow air and is then sprayed into the furnace chamber after being mixed in the air vents, wherein the volume of the straight flow air is controlled through a drawbar, so that the rotating flow strength of the internal secondary air can be effectively controlled; both a primary air outlet and a secondary air outlet are provided with spray nozzle tapering structures at a certain angle, so that timely mixing the secondary air and the pulverized coal can be effectively controlled, and meanwhile, the water cooling wall of the spray nozzle can be in an oxidizing atmosphere for a long time, further slag formation and high-temperature corrosion of the water cooling wall of a combustor area can be effectively avoided. The classification strengthened low NOx pulverized coal combustor has the advantages of being strong in flame stabilization performance, good in adjusting performance, strong in adaptability to various coals and capable of reducing low NOx discharge.
Description
Technical field
The utility model relates to Utility Boiler Technology field, particularly a kind of strengthening classification low-NOx pulverized coal burner that is applicable to coal-burning boiler.
Background technology
Along with the increasingly stringent of country to the control of station boiler discharged nitrous oxides, the combustion system technology of the supporting low-NOx combustor of a kind of full burner hearth air classification is widely applied, and has formed low NOx cyclone and the DC burner technology of various schools.
With regard to the wall formula boiler that liquidates, for nitrogen oxide is effectively reduced in stove, full burner hearth fractional combustion low NOx drainage technology adopts being supplied to the needed whole air of coal dust after-flame (oxygen amount) in stove to be divided into two parts, portion of air sprays into burner hearth from lower hearth main burner spout, meets the coal dust requisite oxygen amount of burning in early days; And another part air is from upper furnace air port (after-flame air port) burner hearth of making a gift to someone, make the aerochemistry equivalent proportion in primary zone be less than 1.
But, application above-mentioned technology with in meeting national pollution reduction requirement, while being particularly applied to the transformation of former conventional burners, the conflicting problem of ubiquity at present: 1, adopt after the low-NOx combustor of fractional combustion, tend to bring combustion-delaying, thereby bring fly ash combustible material higher.If 2 adopt strengthening coal powder ignition in early stage and do not adopt fractional combustion solution fly ash combustible material higher, bring again NOx higher.These two very difficult balance, and in actual transformation, often need to obtain an appropriate equalization point aspect higher at NOx and fly ash combustible material,, in the acceptable degree of fly ash combustible material, reduces the discharge of NOx as far as possible.
Utility model content
Technical problem: the purpose of this utility model is for the deficiency in prior art, provides a kind of compact conformation, easy to adjust, strong adaptability, strengthening classification low-NOx pulverized coal burner that result of use is good.
Technical scheme: strengthening classification low-NOx pulverized coal burner of the present utility model, comprise wind passage one time, be located at the coal dust current equalizer in wind feeder connection one time, a described wind passage outer race is equipped with direct current inner second air passage, the outer wall of direct current inner second air passage is provided with and is compiled in the eddy flow inner second air passage that sprays into burner hearth after same passage, a described wind channel exit is provided with coal dust classifier, described direct current inner second air passage is provided with the pull bar of damper intake, direct current inner second air channel rear portion outer race is equipped with eddy flow outer second air passage, eddy flow outer second air feeder connection place is provided with the adjusting device that can regulate outer second air swirl vane, the enlarging cone angle gamma of the enlarging cone angle of a wind passage air outlet, inner second air passage air outlet sleeve enlarging cone angle beta, outer second air passage air outlet is 40-45 °.
Described coal dust classifier is a cylindrical annular tube channel, on tube channel outer wall, is furnished with wind blade, and tube channel is cast by high-abrasive material or formed by inlaying high-abrasive material inside and outside common iron.
Described adjusting device comprises along the bent axle of one group of rotatable blade of eddy flow outer second air passage inner periphery arranged tangential, adjusting vane swaying direction and is connected to the drive connecting rod axle formation on bent axle.
Beneficial effect: the utility model can regulate the correlation of NOx and fly ash combustible material, reaches preferred values mutually.In the time that fly ash combustible material is higher, will open eddy flow inner second air passage and increase swirl secondary air air quantity, improve the swirl strength of whole air-flow, the mixing of strengthening coal dust and air, strengthening burning in early stage, is reduced fly ash combustible material.When NOx discharges when higher, reduce eddy flow inner second air air quantity and also strengthen direct-current secondary wind air quantity, the mixing of Secondary Air and pulverized coal flame is weakened, delayed combustion.By adjusting the air quantity of eddy flow inner second air and direct current inner second air, adjust the mixing of Secondary Air and pulverized coal flame and adjust burning, thereby reach lower NOx and the acceptable fly ash combustible material of transformation boiler.The utility model coal adaptability is strong.Design unique coal dust current equalizer, coal dust classifier for different coals.Simultaneously by inner second air adjusting rod and outer second air adjusting device, the air quantity of adjustable interior outer second air and/or swirl strength, the mixing opportunity of high temperature gases recirculating district, control combustion device spout center and a Secondary Air, to adapt to the ignition and steady combustion requirement of Coal rank.It is simple in structure, and the combustion stability that catches fire is good, and adjusting function is good simultaneously, and coal adaptability is strong, and has low-nitrogen oxide discharging feature.
Brief description of the drawings
Fig. 1 is the utility model strengthening classification low-NOx pulverized coal burner structural representation.
In figure: 1-wind passage, 2-direct current inner second air passage, 3-eddy flow inner second air passage, 4-eddy flow outer second air passage, 5-coal dust current equalizer, 6-coal dust classifier, 7-expansion vertebra, 8-pull bar, 9-adjusting device.
Detailed description of the invention
Below in conjunction with accompanying drawing, an embodiment of the present utility model is further described:
Strengthening classification low-NOx pulverized coal burner of the present utility model, is mainly made up of wind passage 1, direct current inner second air passage 2, eddy flow inner second air passage 3, eddy flow outer second air passage 4, coal dust current equalizer 5, a coal dust classifier 6, in wind passage 1 straight length, inlet side arranges coal dust current equalizer 5, export a side coal dust classifier 6 is set, one time wind passage 1 outer race is equipped with direct current inner second air passage 2, the outer wall of direct current inner second air passage 2 is provided with and is compiled in the eddy flow inner second air passage 3 that sprays into burner hearth after same passage, described wind passage 1 exit is provided with coal dust classifier 6, described coal dust classifier 6 is a cylindrical annular tube channel, on tube channel outer wall, be furnished with wind blade, tube channel is cast by high-abrasive material or is formed by inlaying high-abrasive material inside and outside common iron, when breeze airflow is after coal dust current equalizer 5 guiding, concentrated phase air-flow enters coal dust classifier inner side, and light phase air-flow flows through from coal dust classifier outside.Described direct current inner second air passage 2 is provided with the pull bar 8 of damper intake, direct current inner second air passage 2 back periphery are set with eddy flow outer second air passage 4, and eddy flow outer second air passage 4 porch are provided with the adjusting device 9 that can regulate outer second air swirl vane; Described adjusting device 9 comprises along the bent axle of one group of rotatable blade of eddy flow outer second air passage 4 inner periphery arranged tangential, adjusting vane swaying direction and is connected to the drive connecting rod axle formation on bent axle, in the time rotating drive connecting rod axle, all blades with identical angle rotation, enter burner hearth thereby the air-flow guiding that enters this blade is formed to swirling eddy along same direction.The enlarging cone angle gamma of the enlarging cone angle of described wind passage 1 air outlet, inner second air passage air outlet sleeve enlarging cone angle beta, outer second air passage 4 air outlets is 40-45 °.
Operation principle: wind/breeze airflow of the utility model enters by the elbow of a ventilating duct 1, under the effect of the coal dust current equalizer 5 of arranging at wind passage 1 straight length entrance, because producing coal dust, effect of inertia concentrates, in an airduct, form dense, light coal powder density distributed architecture, and the coal dust classifier 6 of straight length outlet by being arranged in a ventilation shaft 1 makes the breeze airflow of variable concentrations spray into burner hearth from center and surrounding respectively.After direct-current secondary wind passage 2 and eddy flow inner second air passage 3, after mixing, shared pathway sprays into burner hearth by inner second air spout.Outer second air, after outer second air air register, produces rotation and sprays into burner hearth through outer second air passage.By former single inner second air passage is divided into binary channels, and be set to respectively direct current inner second air and eddy flow wind inner second air passage, and collect in inner second air passage and send into burner hearth, sneak into breeze airflow and participate in burning.In the time that fly ash combustible material is higher, by opening eddy flow inner second air passage and increasing swirl secondary air air quantity, improve the swirl strength of whole air-flow, the mixing of strengthening coal dust and air, strengthening burning in early stage, is reduced fly ash combustible material.When NOx discharges when higher, reduce eddy flow inner second air air quantity and also strengthen direct-current secondary wind air quantity, the mixing of Secondary Air and pulverized coal flame is weakened, delayed combustion.By adjusting the air quantity of eddy flow inner second air and direct current inner second air, adjust the mixing of Secondary Air and pulverized coal flame and adjust burning, thereby reach lower NOx and the acceptable fly ash combustible material of transformation boiler.Inside and outside overfire air port is all furnished with adjusting yoke, and eddy flow inner second air is tangential vane structure, by the air quantity of pull bar 8 adjustable inner second airs; Eddy flow outer second air is tangential vane structure, by adjusting device 9, can regulate the swirl strength of outer second air, thereby can obtain at burner center rational high temperature gases recirculating district, and control the in good time mixing of primary and secondary air, make center high concentration pulverized coal quick ignition in high temperature gases recirculating district, burning, consume rapidly inner oxygen amount, make burner in anoxycausis nitrogen oxides reduction, reach the object of the efficient after-flame of coal dust in early stage.
Claims (3)
1. a strengthening classification low-NOx pulverized coal burner, comprise a wind passage (1), be located at the coal dust current equalizer (5) in a wind passage (1) entrance, a described wind passage (1) outer race is equipped with direct current inner second air passage (2), the outer wall of direct current inner second air passage (2) is provided with and is compiled in the eddy flow inner second air passage (3) that sprays into burner hearth after same passage, it is characterized in that: a described wind passage (1) exit is provided with coal dust classifier (6), described direct current inner second air passage (2) is provided with the pull bar (8) of damper intake, direct current inner second air passage (2) back periphery is set with eddy flow outer second air passage (4), eddy flow outer second air passage (4) porch is provided with the adjusting device (9) that can regulate outer second air swirl vane, the enlarging cone angle gamma of the enlarging cone angle of a wind passage (1) air outlet, inner second air passage air outlet sleeve enlarging cone angle beta, outer second air passage (4) air outlet is 40-45 °.
2. strengthening classification low-NOx pulverized coal burner according to claim 1, it is characterized in that: described coal dust classifier (6) is a cylindrical annular tube channel, on tube channel outer wall, be furnished with wind blade, tube channel is cast by high-abrasive material or is formed by inlaying high-abrasive material inside and outside common iron.
3. strengthening classification low-NOx pulverized coal burner according to claim 1, is characterized in that: described adjusting device (9) comprises along the bent axle of one group of rotatable blade of eddy flow outer second air passage (4) inner periphery arranged tangential, adjusting vane swaying direction and is connected to the drive connecting rod axle formation on bent axle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420017276.6U CN203718766U (en) | 2014-01-13 | 2014-01-13 | Classification strengthened low NOx pulverized coal combustor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420017276.6U CN203718766U (en) | 2014-01-13 | 2014-01-13 | Classification strengthened low NOx pulverized coal combustor |
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| Publication Number | Publication Date |
|---|---|
| CN203718766U true CN203718766U (en) | 2014-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420017276.6U Expired - Fee Related CN203718766U (en) | 2014-01-13 | 2014-01-13 | Classification strengthened low NOx pulverized coal combustor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103759259A (en) * | 2014-01-13 | 2014-04-30 | 徐州燃控科技股份有限公司 | Intensive-classification low-NOx pulverized coal burner |
-
2014
- 2014-01-13 CN CN201420017276.6U patent/CN203718766U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103759259A (en) * | 2014-01-13 | 2014-04-30 | 徐州燃控科技股份有限公司 | Intensive-classification low-NOx pulverized coal burner |
| CN103759259B (en) * | 2014-01-13 | 2016-06-15 | 徐州科融环境资源股份有限公司 | Strengthening classification low-NOx pulverized coal burner |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 221004 No. 12 Yang Shan Road, Xuzhou Economic Development Zone, Jiangsu, China Patentee after: XUZHOU KERONG ENVIRONMENTAL RESOURCES CO., LTD. Address before: 221004 No. 12 Yang Shan Road, Xuzhou Economic Development Zone, Jiangsu, China Patentee before: Xuzhou Combustion Control Research Institute Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140716 Termination date: 20170113 |