CN203431913U - Over-firing air distribution device of coal-fired boiler - Google Patents
Over-firing air distribution device of coal-fired boiler Download PDFInfo
- Publication number
- CN203431913U CN203431913U CN201320414109.0U CN201320414109U CN203431913U CN 203431913 U CN203431913 U CN 203431913U CN 201320414109 U CN201320414109 U CN 201320414109U CN 203431913 U CN203431913 U CN 203431913U
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- Prior art keywords
- air
- over
- flame
- firing
- coal
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- 238000010304 firing Methods 0.000 title abstract description 14
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 11
- 239000003245 coal Substances 0.000 abstract description 7
- 239000000843 powder Substances 0.000 abstract 3
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 239000002817 coal dust Substances 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 241000208125 Nicotiana Species 0.000 description 1
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001706 oxygenating effect Effects 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
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Abstract
The utility model discloses an over-firing air distribution device of a coal-fired boiler. The device comprises an air box, a plurality of over-firing air units are arranged in the air box, the air box is provided with an air inlet used for supplying air to the over-firing air units, each over-firing air unit is of a hexahedron shape, each hexahedron is provided with three over-firing air channels penetrating through the front side and the rear side of each corresponding hexahedron and towards a hearth of the coal-fired boiler, the sizes of air outlet ports of every three over-firing air channels are reduced from top to bottom, the inside of each over-firing air channel is provided with an over-firing air amount adjusting plate used for controlling the air amount, and an air door swing controller used for controlling horizontal swing of the over-firing air units is arranged in the air box or out of the air box. The over-firing air distribution device achieves deep staged combustion of coal powder, prolongs stay time of the coal powder in an over-firing air area, and promotes complete combustion of the coal powder in the over-firing air area.
Description
Technical field
The utility model relates to heat enginnering technical field, relates to the air distribution mode of coal burning boiler of power station after-flame wind, especially relates to distribution and the adjusting of coal-burning boiler after-flame wind air quantity.
Background technology
Researched of Air Staging Combustion Burning Pulverized Coal is the effective technology that falls low NOx drainage at present, and air classification principle is mainly to reduce fuel bound nitrogen to be combined with airborne oxygen, by forming fuel-rich region, NOx is reduced to N
2, to reduce the generation of fuel type NOx, after pyrolysis of coal completes, then fill into after-flame wind to complete the after-flame of uncompleted burned carbon.But most boilers have occurred that fly ash combustible material and exhaust gas temperature raise after adopting Researched of Air Staging Combustion Burning Pulverized Coal; fail to take into account environmental protection and energy conservation; especially " W " flame boiler; furnace width is large; along furnace chamber width, very easily there is oxygen amount distribution bias; air classification causes lower hearth oxygen amount deviation to strengthen, and upper furnace air fills into when inhomogeneous and aggravated this deviation, caused burning not exclusively.
Summary of the invention
Technical problem to be solved in the utility model is, not enough for prior art, a kind of coal-burning boiler after-flame wind arrangement apparatus is provided, realize coal dust deeply staged combustion, extend coal dust in the after-flame wind region time of staying simultaneously, promote coal dust in the region completing combustion of after-flame wind.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of coal-burning boiler after-flame wind arrangement apparatus, comprise bellows, in described bellows, be provided with several after-flame wind unit, on described bellows, offer the air inlet of promising described after-flame wind unit air feed, described after-flame wind cell configuration is hexahedron, on described hexahedron, offer three after-flame air channels of running through before and after described hexahedron and facing coal-burning boiler burner hearth, the size of three after-flame air channel air-out ports is successively decreased from top to bottom, in described after-flame airduct, be provided with the after-flame air-flow plate of controlling air force, described bellows inside or bellows are outside equipped with the air door tilt control that regulates described after-flame wind unit horizontal to swing.
As preferred version, described three after-flame air channels are cylindrical shape, and described three cylindrical diameters are followed successively by 500-800mm, 300-600mm, 200-400mm from top to bottom, and described three cylinder base areas are than being 3:2:1.5.
Compared with prior art, the beneficial effect that the utility model has is: device of the present utility model, by after-flame wind region coal dust deeply staged combustion, extends coal dust in the after-flame wind region time of staying, promotes coal dust in the region completing combustion of after-flame wind; Realize after-flame wind deep-graded, further promote NO
xclassification reduction; By the after-flame wind layout that swings, reduce " W " flame boiler combustion exhausted wind region along furnace chamber width oxygen amount deviation, eliminate local anoxic, guarantee that coal dust firing is complete, can realize under underload for the put into operation part adjustment of position of burner simultaneously; Taken into account the requirement of environmental protection and energy conservation.
Accompanying drawing explanation
Fig. 1 is the utility model one embodiment bellows structure schematic diagram;
Fig. 2 is the utility model one embodiment after-flame wind unit three-dimensional figure;
Fig. 3 is the utility model one embodiment after-flame wind unit cutaway view.
The specific embodiment
As depicted in figs. 1 and 2, the utility model one embodiment comprises bellows 1, in described bellows 1, be provided with several after-flame wind unit 2, on described bellows 1, offer the air inlet 5 of promising described after-flame wind unit 2 air feeds, described after-flame wind unit 2 is shaped as hexahedron, on described hexahedron, offer three after-flame air channels 3 of running through before and after described hexahedron and facing coal-burning boiler burner hearth, the size of three after-flame air channel air-out ports is successively decreased from top to bottom, is provided with the after-flame air-flow plate 6 of controlling air force in described after-flame airduct; Described bellows inside or bellows are outside equipped with the air door tilt control 4 that regulates described after-flame wind unit horizontal to swing.
As shown in Figure 2, described three after-flame air channels are cylindrical shape, and the diameter of described three cylinder A, B, C is followed successively by 500-800mm, 300-600mm, 200-400mm from top to bottom, and described three cylinder A, B, C base area are than being 3:2:1.5.
The utility model adopts inverted triangle arrangement, after-flame air quantity is increased from top to bottom gradually, by three grades of after-flame blast tobacco curing gas rates of climb, extend uncompleted burned carbon in the after-flame wind region time of staying, uncompleted burned carbon burns step by step in three grades of after-flame wind districts, until complete after-flame.Under the control of air door tilt control, after-flame wind unit can swing (full swing miter angle), burner hearth left side after-flame wind can be swung to the right, burner hearth right side after-flame wind can swing left, thereby adjust furnace chamber width oxygen amount, distribute, reduce the partial combustion causing due to oxygen amount imbalance insufficient.Eliminate the local anoxic in after-flame wind region, further promote the complete after-flame of coal dust.The oxygenating of after-flame wind classification has simultaneously realized deeply staged combustion, is more conducive to reduce the discharge of NOx.Device of the present utility model can reduce NO
xin the time of discharge, guarantee the abundant burning of coal dust.
Claims (2)
1. a coal-burning boiler after-flame wind arrangement apparatus, comprise bellows (1), in described bellows (1), be provided with several after-flame wind unit (2), on described bellows (1), offer the air inlet (5) of promising described after-flame wind unit (2) air feed, it is characterized in that, described after-flame wind unit (2) is shaped as hexahedron, on described hexahedron, offer three after-flame air channels (3) of running through before and after described hexahedron and facing coal-burning boiler burner hearth, the size of three after-flame air channel air-out ports is successively decreased from top to bottom, in described after-flame airduct, be provided with the after-flame air-flow plate of controlling air force, described bellows (1) inside or bellows (1) are outside equipped with the air door tilt control (4) that regulates described after-flame wind unit horizontal to swing.
2. coal-burning boiler after-flame wind arrangement apparatus according to claim 1, it is characterized in that, described three after-flame air channels are cylindrical shape, three cylindrical diameters are followed successively by 500-800mm, 300-600mm, 200-400mm from top to bottom, and described three cylinder base areas are than being 3:2:1.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320414109.0U CN203431913U (en) | 2013-07-12 | 2013-07-12 | Over-firing air distribution device of coal-fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320414109.0U CN203431913U (en) | 2013-07-12 | 2013-07-12 | Over-firing air distribution device of coal-fired boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203431913U true CN203431913U (en) | 2014-02-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320414109.0U Expired - Fee Related CN203431913U (en) | 2013-07-12 | 2013-07-12 | Over-firing air distribution device of coal-fired boiler |
Country Status (1)
| Country | Link |
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| CN (1) | CN203431913U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183746A (en) * | 2021-10-27 | 2022-03-15 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Over-fire air nozzle structure |
-
2013
- 2013-07-12 CN CN201320414109.0U patent/CN203431913U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183746A (en) * | 2021-10-27 | 2022-03-15 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Over-fire air nozzle structure |
| CN114183746B (en) * | 2021-10-27 | 2024-01-30 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Over-fire air nozzle structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140212 Termination date: 20180712 |
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| CF01 | Termination of patent right due to non-payment of annual fee |