CN201606876U - Low-NOx coal burner - Google Patents
Low-NOx coal burner Download PDFInfo
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- CN201606876U CN201606876U CN201020100691XU CN201020100691U CN201606876U CN 201606876 U CN201606876 U CN 201606876U CN 201020100691X U CN201020100691X U CN 201020100691XU CN 201020100691 U CN201020100691 U CN 201020100691U CN 201606876 U CN201606876 U CN 201606876U
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- disturbance
- wind
- classification
- bellows
- air channel
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Abstract
The utility model discloses a low-NOx coal burner, comprising an inner secondary wind box, a grading wind box and a disturbance wind box which are formed by division of a first clapboard and a second clapboard which are provided with round holes from the center sequentially, and the three wind boxes are provided with wind inlets which are inclined circumferentially on the pipe walls correspondingly, a first wind pipe penetrates through the inner secondary wind box axially, an inner secondary wind pipe which is provided with a swirling vane is sheathed outside the first wind pipe axially, the inner secondary wind pipe is connected with the first clapboard in a sealing way, a conical barrel formed by outward conical extension at the round hole position of the first clapboard, a pre-ignition chamber with opening two ends is arranged in the disturbance wind box axially, a ring-shaped channel is formed between the wall of the disturbance wind box and the wall of the pre-ignition chamber, a ring-shaped end surface is arranged at the outlet position of the ring-shaped channel, a disturbance wind nozzle is fixed at the opening position of the ring-shaped end surface, the inlet end of the pre-ignition chamber is connected with the second clapboard in a sealing way, a ring-shaped grading air duct is arranged at the inlet root part of the pre-ignition chamber, and the conical barrel is fixed with the inner wall of the grading air duct in a sealing way.
Description
Technical field
The utility model relates to a kind of coal burner, relates in particular to a kind of low NO
XCoal burner.
Background technology
At present, China has 500,000 Industrial Boilers approximately, and coal-burned industrial boiler accounts for more than 80% of its total amount, and is wherein in the majority with the chain furnace that adopts the grate firing mode again.The defective that mode chain furnace combustion itself exists has determined that its thermal efficiency can not reach higher level, and the equipment operating thermal efficiency on average only is about 65%.And the industrial coal powder boiler of employing suspension combustion mode then has higher boiler efficiency.Coal dust burning on Industrial Boiler, the design of burner are crucial.Because the furnace cavity of Industrial Boiler is less, this just requires burner should be able to organize the interior flow field of stove preferably, and coal dust can be burnt efficiently and stably, can avoid ash erosion to produce, and has low NO simultaneously again
XDischarge function.And the coal burner of putting into operation now is applied to power plant mostly, is applicable to that the coal burner of Industrial Boiler is then less.
The utility model content
At the problem of above existence, the purpose of this utility model is to provide and is suitable for a kind of low NO that Industrial Boiler is used
XCoal burner.
The technical solution adopted in the utility model is: this low NO
XCoal burner mainly comprises successively and has first dividing plate of circular hole and interior secondary air box, classification bellows and the disturbance bellows that second partition is separated to form by the center, described in secondary air box, classification bellows, disturbance bellows on tube wall separately, correspondingly be provided with interior secondary wind air inlet, classification wind air inlet, disturbance wind air inlet towards peripheral, oblique; Interior secondary air box is penetrated with airduct vertically one time, coaxially outside airduct be arranged with interior secondary air channel, interior secondary air channel with the circular hole place and the first dividing plate sealed attachment of first dividing plate, in the interior secondary air channel swirl vane is installed, interior secondary air channel places in the classification bellows at the conically shaped that the outside reamer in the circular hole place of described first dividing plate extends to form; The coaxial precombustion chamber that is provided with open at both ends in the disturbance bellows, form the circular passage between the wall of disturbance bellows and the wall of precombustion chamber, the exit of this circular passage is provided with annular end face, is provided with perforate on the annular end face equably, is installed with the disturbance wind snout at described tapping; The entrance point of precombustion chamber is in the circular hole place and the second partition sealed attachment of second partition; The import root place of precombustion chamber is provided with the classification air channel of annular, and the inner wall sealing in described conically shaped and classification air channel is fixedly connected.
Further, in the classification described in the utility model air channel swirl vane is installed.
Further, the port of export of an airduct described in the utility model is the enlarging shape, and this enlarging shape port of export extend in the conically shaped, is welded with conical bluff body by fire-resistant reinforcing bar in this enlarging shape port of export.
Further, formed angle is α and 10 °≤α≤20 ° between the central axis of the central axis of disturbance wind snout described in the utility model and precombustion chamber.
Compared with prior art, the beneficial effect that the utlity model has is:
(1) the utility model is provided with swirl vane in interior secondary air channel, makes through the air-flow of swirl vane and produces rotation, and at an airduct spout place bluff body is set, and is beneficial to the recirculating zone that catches fire thereby be formed with, and makes that coal dust is easier to be lighted;
(2) the utility model has adopted the precombustion chamber design, utilizes the radiation of precombustion chamber high temperature barrel and the convection heat transfer' heat-transfer by convection of reverse reflux high-temperature flue gas, make breeze airflow rapid fire burns; On the other hand, the classification wind of precombustion chamber root is swirling eddy, has the ash effect of blowing, and makes in the precombustion chamber not dust stratification, and can effectively prevent slagging scorification.
(3) the utility model has sprayed into disturbance wind at the burner outlet place, has strengthened the level of disruption of air-flow, thereby has promoted the burning of coal dust, has improved the burn-off rate of coal dust.
(4) three grades of air distribution modes of secondary wind, classification wind and disturbance wind had reduced the discharging of nitrogen oxide effectively in the utility model adopted;
(5) new structure of the present utility model is evenly distributed the ignition temperature of pulverized coal flame in boiler furnace, the phenomenon of hot-spot can not occur;
(6) the utility model is applicable to various small and medium-sized industrial coal powder boilers, in use has higher efficiency of combustion.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is that the A of Fig. 1 is to view.
Fig. 3 is a disturbance wind snout distribution schematic diagram.
The specific embodiment
Below in conjunction with drawings and Examples the utility model is further described.
As shown in Figure 1 and Figure 2, the compartment of terrain is installed with first dividing plate 15 and second partition 16 in the coal burner of the present utility model, and the center of these two dividing plates all has circular hole.By first dividing plate 15 and second partition 16, the inside of coal burner is separated to form interior secondary air box 7, classification bellows 8 and the disturbance bellows 9 that are arranged in order.As shown in Figure 2, on above-mentioned three bellows tube wall separately, correspondingly be provided with towards interior secondary wind air inlet 11, classification wind air inlet 12, the disturbance wind air inlet 13 of the peripheral, oblique of tube wall.Three air inlets adopt the peripheral, oblique design, and according to fluid mechanics principle as can be known, air-flow adopts this mode to enter bellows, make that the air-flow in the bellows is more even, thereby have improved the uniformity of burner outlet section air-flow.Interior secondary air box 7 is penetrated with airduct 1 vertically one time, secondary air channel 2 in coaxial being arranged with outside airduct 1, interior secondary air channel 2 with the circular hole place and first dividing plate, 15 sealed attachment of first dividing plate 15, interior secondary air channel 2 places classification bellows 8 at the conically shaped 14 that the outside reamer in the circular hole place of first dividing plate 15 extends to form.In the interior secondary air channel 2 swirl vane 5 is installed, produce rotation when making air communication cross herein, the port of export of an airduct 1 is the enlarging shape, and this enlarging shape port of export extend in the conically shaped 14, is welded with conical bluff body 6 by fire-resistant reinforcing bar in this enlarging shape port of export.Under the swirl vane 5 in interior secondary air channel 2 and the acting in conjunction of bluff body 6, (being the afterbody of bluff body 6) formed the high temperature recirculation zone that helps the steady combustion of coal powder ignition at the center after air-flow flowed out spout.The coaxial precombustion chamber 10 (being the central axes of disturbance bellows 9 and precombustion chamber 10) that is provided with in the disturbance bellows 9, the open at both ends of precombustion chamber 10, form the circular passage between the wall of the wall of disturbance bellows 9 and precombustion chamber 10, the exit of this circular passage is provided with annular end face 17, be provided with several perforates on the annular end face 17 equably, be installed with disturbance wind snout 4 at these tappings.In addition, the entrance point of precombustion chamber 10 is in the circular hole place and second partition 16 sealed attachment of second partition 16, thereby blocked two strands of air-flows in disturbance bellows 9 and the classification bellows 8, prevents the channelling of two strands of air-flows.Because the space in the precombustion chamber 10 is less, and inwall is that heat-insulation material is made, so the wall temperature of precombustion chamber 10 can very fast rising and is remained on one than higher temperature, breeze airflow under the convection heat transfer' heat-transfer by convection acting in conjunction of the radiation of high temperature barrel and reverse reflux high-temperature flue gas, rapid fire burns.The import root place of precombustion chamber 10 is provided with the classification air channel 3 of annular, in the classification air channel 3 swirl vane is installed, and its inwall connects with conically shaped 14 sealing and fixing.Classification wind is close to precombustion chamber 10 walls by classification air channel 3 and is rotated into burner, not only can prevent the slagging scorification of precombustion chamber 10 effectively, also can play a very good protection to burner outlet.As shown in Figure 3, be provided with perforate equably on the annular end face 17 in the exit of disturbance bellows 9, be installed with disturbance wind snout 4 at tapping, formed angle is α between the central axis of the central axis of disturbance wind snout 4 and precombustion chamber 10.α is set in 10 °≤α≤20 °, can make disturbance wind in this angular range by 4 ejections of disturbance wind snout, have disturbance effect preferably, thereby promote the burning of coal dust, improve the burn-off rate of coal dust.
Coal burner of the present utility model becomes three parts to the required secondary air separating of coal dust after burning, promptly by interior secondary air channel 2, classification air channel 3, disturbance wind snout 4, fuel formerly anoxic, the back oxygen enrichment condition under burn, reduced the discharging of nitrogen oxide effectively.
The course of work of the present utility model is as follows:
Burner hearth is earlier with after 10 seconds of igniting air gun (not shown) preheating, open blower fan, breeze airflow is entered by an airduct 1, walk around bluff body 6 ejections, and the combustion gas of having been burnt lights, secondary wind air inlet 11, classification wind air inlet 12 and disturbance wind air inlet 13 in opening simultaneously, and secondary wind, classification wind, disturbance wind enter burner by interior secondary air channel 2, classification air channel 3, disturbance wind snout 4 respectively in this moment, realize the classification supply of air, can effectively reduce NO
XDischarging.Coal dust lighted and with combustion gas cofiring after 10 seconds, close the igniting air gun, fully by coal dust firing.After the air communication of wherein interior secondary air channel 2 is crossed swirl vane 5, produce rotation, (promptly at bluff body 6 afterbodys) form the recirculating zone at the center behind the outflow spout, entrainment the high-temperature flue gas in the stove, heating and firing coal-dust.By the valve (not shown) in secondary wind air inlet 11, classification wind air inlet 12,13 imports of disturbance wind air inlet in regulating, the just combustion case of adjustable flame in boiler furnace, thus improve combustion efficiency.
Claims (4)
1. low NO
XCoal burner, it is characterized in that: comprise successively having first dividing plate of circular hole and interior secondary air box, classification bellows and the disturbance bellows that second partition is separated to form that described interior secondary air box, classification bellows, disturbance bellows correspondingly are provided with interior secondary wind air inlet, classification wind air inlet, disturbance wind air inlet towards peripheral, oblique on tube wall separately by the center; Interior secondary air box is penetrated with airduct vertically one time, coaxially outside airduct be arranged with interior secondary air channel, interior secondary air channel with the circular hole place and the first dividing plate sealed attachment of first dividing plate, in the interior secondary air channel swirl vane is installed, interior secondary air channel places in the classification bellows at the conically shaped that the outside reamer in the circular hole place of described first dividing plate extends to form; The coaxial precombustion chamber that is provided with open at both ends in the disturbance bellows, form the circular passage between the wall of disturbance bellows and the wall of precombustion chamber, the exit of this circular passage is provided with annular end face, is provided with perforate on the annular end face equably, is installed with the disturbance wind snout at described tapping; The entrance point of precombustion chamber is in the circular hole place and the second partition sealed attachment of second partition; The import root place of precombustion chamber is provided with the classification air channel of annular, and the inner wall sealing in described conically shaped and classification air channel is fixedly connected.
2. a kind of low NO according to claim 1
XCoal burner is characterized in that: described classification is equipped with swirl vane in the air channel.
3. a kind of low NO according to claim 1
XCoal burner is characterized in that: the port of export of a described airduct is the enlarging shape, and this enlarging shape port of export extend in the conically shaped, is welded with conical bluff body by fire-resistant reinforcing bar in this enlarging shape port of export.
4. a kind of low NO according to claim 1
XCoal burner is characterized in that: formed angle is α and 10 °≤α≤20 ° between the central axis of described disturbance wind snout and the central axis of precombustion chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020100691XU CN201606876U (en) | 2010-01-19 | 2010-01-19 | Low-NOx coal burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020100691XU CN201606876U (en) | 2010-01-19 | 2010-01-19 | Low-NOx coal burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201606876U true CN201606876U (en) | 2010-10-13 |
Family
ID=42951582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020100691XU Expired - Lifetime CN201606876U (en) | 2010-01-19 | 2010-01-19 | Low-NOx coal burner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201606876U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101725969B (en) * | 2010-01-19 | 2011-08-17 | 中国计量学院 | Low-NOx pulverized coal burner |
| CN106287667A (en) * | 2016-10-08 | 2017-01-04 | 西安交通大学 | A kind of high temperature gases recirculating preheating type low-NOx combustor being provided with SOFA |
| CN108167826A (en) * | 2017-12-29 | 2018-06-15 | 浙江百能科技有限公司 | A kind of turbulent burner for being used for fuel oil or gas steam injection boiler |
| CN109578989A (en) * | 2019-01-17 | 2019-04-05 | 江苏羚羊水泥工程技术有限公司 | A kind of efficiently low vertical coal dust furnace of nitrogen |
| CN112228871A (en) * | 2020-11-09 | 2021-01-15 | 华侨大学 | Swirler and combustion device |
-
2010
- 2010-01-19 CN CN201020100691XU patent/CN201606876U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101725969B (en) * | 2010-01-19 | 2011-08-17 | 中国计量学院 | Low-NOx pulverized coal burner |
| CN106287667A (en) * | 2016-10-08 | 2017-01-04 | 西安交通大学 | A kind of high temperature gases recirculating preheating type low-NOx combustor being provided with SOFA |
| CN106287667B (en) * | 2016-10-08 | 2018-10-30 | 西安交通大学 | A kind of high temperature gases recirculating preheating type low-NOx combustor equipped with SOFA |
| CN108167826A (en) * | 2017-12-29 | 2018-06-15 | 浙江百能科技有限公司 | A kind of turbulent burner for being used for fuel oil or gas steam injection boiler |
| CN109578989A (en) * | 2019-01-17 | 2019-04-05 | 江苏羚羊水泥工程技术有限公司 | A kind of efficiently low vertical coal dust furnace of nitrogen |
| CN109578989B (en) * | 2019-01-17 | 2024-04-09 | 江苏羚羊水泥工程技术有限公司 | Low-nitrogen vertical pulverized coal combustion furnace |
| CN112228871A (en) * | 2020-11-09 | 2021-01-15 | 华侨大学 | Swirler and combustion device |
| CN112228871B (en) * | 2020-11-09 | 2024-06-07 | 华侨大学 | Cyclone and combustion device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20101013 Effective date of abandoning: 20100119 |