CN201606876U - Low-NOx coal burner - Google Patents
Low-NOx coal burner Download PDFInfo
- Publication number
- 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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- CN
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- Prior art keywords
- disturbance
- bellows
- secondary air
- classification
- partition
- 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 19
- 238000005192 partition Methods 0.000 claims abstract description 15
- 210000004894 snout Anatomy 0.000 claims description 11
- 230000008676 import Effects 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 230000009970 fire resistant effect Effects 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 8
- 239000002817 coal dust Substances 0.000 description 11
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000003134 recirculating effect Effects 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Abstract
本实用新型公开了一种低NOx煤粉燃烧器，包括依次由中心开有圆孔的第一隔板和第二隔板分隔形成的内二次风箱、分级风箱和扰动风箱，该三个风箱在各自管壁上相应地设有一个朝周向倾斜的风进风口；内二次风箱沿轴向贯穿有一次风管，一次风管外同轴套设有装有旋流叶片的内二次风管，内二次风管与第一隔板密封联接，内二次风管在第一隔板的圆孔处向外扩锥延伸形成的锥形筒在分级风箱内；扰动风箱内同轴设有两端敞口的预燃室，扰动风箱的壁与预燃室的壁之间形成环形通道，环形通道的出口处设有环形端面，在环形端面的开孔处固定有扰动风喷口；预燃室的进口端与第二隔板密封联接；预燃室的进口根部处设有环形的分级风道，锥形筒与分级风道的内壁密封固定。
The utility model discloses a low NO x pulverized coal burner, which comprises an inner secondary air box, a grading air box and a disturbance air box which are sequentially separated by a first partition with a round hole in the center and a second partition. The bellows are respectively equipped with a wind inlet inclined towards the circumferential direction on the respective tube walls; the inner secondary air box runs through the primary air duct in the axial direction, and the outer coaxial sleeve of the primary air duct is provided with an inner secondary air duct equipped with swirl blades. The secondary air pipe, the inner secondary air pipe is sealed and connected with the first partition, and the inner secondary air pipe expands outward at the round hole of the first partition to form a cone-shaped tube in the classification bellows; the same inside the disturbance bellows The shaft is provided with a pre-combustion chamber with both ends open, and an annular channel is formed between the wall of the disturbance air box and the wall of the pre-combustion chamber. The exit of the annular channel is provided with an annular end surface, and a disturbance air nozzle is fixed at the opening of the annular end surface. The inlet end of the pre-chamber is sealed and connected with the second partition; the root of the inlet of the pre-chamber is provided with an annular grading air duct, and the tapered cylinder is sealed and fixed with the inner wall of the grading air duct.
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 | A 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 | A 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 |