CN2539908Y - Three air-blowing concentrated reburning NOx-reducing discharge device - Google Patents
Three air-blowing concentrated reburning NOx-reducing discharge device Download PDFInfo
- Publication number
- CN2539908Y CN2539908Y CN 02216516 CN02216516U CN2539908Y CN 2539908 Y CN2539908 Y CN 2539908Y CN 02216516 CN02216516 CN 02216516 CN 02216516 U CN02216516 U CN 02216516U CN 2539908 Y CN2539908 Y CN 2539908Y
- Authority
- CN
- China
- Prior art keywords
- air
- reburning
- zone
- pipe
- nox
- 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 - Fee Related
Links
- 238000007664 blowing Methods 0.000 title abstract 6
- 238000002485 combustion reaction Methods 0.000 claims abstract description 21
- 229910002089 NOx Inorganic materials 0.000 claims abstract description 9
- 239000012141 concentrate Substances 0.000 claims description 8
- 238000010079 rubber tapping Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 7
- 239000010881 fly ash Substances 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 230000003247 decreasing Effects 0.000 abstract 1
- 239000003245 coal Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 206010002660 Anoxia Diseases 0.000 description 1
- 241000976983 Anoxia Species 0.000 description 1
- 241000273930 Brevoortia tyrannus Species 0.000 description 1
- 229920002456 HOTAIR Polymers 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Abstract
The utility model relates to a three air-blowing concentrated reburning NOx-reducing discharge device. A three air-blowing pipe (1), a bifurcated pipe (2) and an adjusting orifice plate (3) are arranged on the utility model, and the three air-blowing pipe (1), the bifurcated pipe (2) and the adjusting orifice plate (3) are divided into two ways; one route is connected with a low resistance hop-pocket-shaped concentrator (4), a dilute phase upper three air-blowing pipe (5) and an upper part of the furnace reburning zone of the boiler (8); the other way is connected with an lower part of the furnace reburning zone of the boiler (8) and an upper part of a main combustion zone (9) through a venturi tube (10), an over-fire air pipe (6) is connected with an upper part of burned zone (7) of the boiler. The utility model is able to decrease the discharge amount of NOx about 50 percent, the unburned carbon content in fly ash is decreased through the three air-blowing concentrated reburning, the burning efficiency is improved, and the improvement expense of the utility model is low.
Description
Technical field
The utility model relates to fuel-device, relates in particular to a kind of tertiary air that utilizes and concentrates combustion reduction NOx tapping equipment again.
Background technology
At present, bunker formula pulverized coal carried by hot air system in the middle of the following boiler of 200MW generally adopts, as the tertiary air of weary gas of coal-grinding and drier,, generally it is sent into the burner hearth burning to improve the economy of unit through special spout because contain parts of fine coal dust (powder containing quantity is about 10%～20%).But the tertiary air temperature is lower, and high humidity easily causes furnace temperature to reduce, and combustion process postpones, and burnout rate descends, and unburned combustible in fly ash increases, and reduces boiler efficiency, also simultaneously combustion stability is constituted a threat to.The purpose of this utility model concentrates tertiary air combustion more exactly and reduces the NOx discharging to satisfy the environmental requirement of increasingly stringent, improves boiler efficiency.
Summary of the invention
The purpose of this utility model provides a kind of tertiary air that utilizes and concentrates combustion reduction NOx tapping equipment again.
It is provided with tertiary-air pipe, bifurcated pipe, controllable register successively, be divided into two the tunnel again, one the tunnel successively with low-resistance cloth-bag type inspissator, dilute phase on tertiary-air pipe, boiler furnace reburning zone top join, another road joins through Venturi tube and below, boiler furnace reburning zone, top, primary zone, and last secondary wind airduct and boiler furnace burnt zone top join.
The utility model can reduce NOx discharge capacity about 50%, and tertiary air concentrate after again combustion reduced carbon content of fly ash, improve efficiency of combustion.And this plant modification expense is low.
Description of drawings
Fig. 1 utilizes tertiary air to concentrate the structural representation that combustion again reduces the NOx tapping equipment
Fig. 2 is that the staged air distribution burner nozzle is arranged schematic diagram.
The specific embodiment
Combustion reduces the NOx tapping equipment to utilize tertiary air to concentrate again, it is provided with tertiary-air pipe 1, bifurcated pipe 2, controllable register 3 successively, be divided into two the tunnel again, one the tunnel successively with low-resistance cloth-bag type inspissator 4, dilute phase on tertiary-air pipe 5,8 tops, boiler furnace reburning zone join, another road joins through Venturi tube 10 and 8 belows, boiler furnace reburning zone, 9 tops, primary zone, and last secondary wind airduct 6 joins with boiler furnace burnt zone 7 tops.
The utility model is realized by following scheme.Tertiary air is divided into upper and lower two strands, and (the air quantity beguine is generally Q according to the requirement of reburning zone excess air coefficient
1: Q
2=3: 2, can regulate by baffle plate).Last tertiary air enters low-resistance cloth-bag type inspissator, the microfine coal more than 99% is wherein efficiently separated entered powder collector.The fine breeze of following tertiary air in Venturi tube injection powder collector sent into the reburning zone and fired, reduces the NO that main combustion zone generates
xSecondary wind originally moves on one, is arranged in the burner top layer, as burnt wind.When the coal pulverizer stoppage in transit, when not having tertiary air, burnt wind can be realized the air classification burning, control NO
xDischarge capacity.
As shown in Figure 2, when system's coal pulverizer operation, the tertiary air after concentrating is sent into burner hearth, between tertiary air and main combustion zone, form an excess air coefficient α
2＜1 reburning zone with reducing atmosphere, the imperfect combustion product C in this zone
nH
mNO with the generation of main combustion zone
xReact, finally generate N
2Thereby, reduce NO
xDischarge capacity.
When coal pulverizer was stopped using, tertiary air was zero, and rely on air classification to burn and control NO this moment
xDischarging.Secondary wind originally move on one be arranged in whole burner the top as burnt wind.Adjustment by operation, about 80% theoretical air requirement is sent into main combustion zone, fuel is burnt under the rich fuel condition of anoxic, reduced burning velocity and the temperature levels in the combustion zone, also cause appropriate reducing atmosphere at burner outlet and combustion centre district, suppressed NO naturally
xGeneration.The required remaining air of completing combustion is sent into burner hearth by setting up on above the main burner overfire air port, and the flue gas that produces down with main burner district anoxia condition mixes, and completing combustion under the condition of α＞1 is with the economical operation of assurance unit.
Claims (1)
1. one kind is utilized tertiary air to concentrate combustion reduction NOx tapping equipment again, it is characterized in that it is provided with tertiary-air pipe (1), bifurcated pipe (2), controllable register (3) successively, be divided into two the tunnel again, one the tunnel successively with low-resistance cloth-bag type inspissator (4), dilute phase on tertiary-air pipe (5), boiler furnace reburning zone (8) top join, another road joins through Venturi tube (10) and below, boiler furnace reburning zone (8), primary zone (9) top, and last secondary wind airduct (6) joins with boiler furnace burnt zone (7) top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02216516 CN2539908Y (en) | 2002-03-29 | 2002-03-29 | Three air-blowing concentrated reburning NOx-reducing discharge device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02216516 CN2539908Y (en) | 2002-03-29 | 2002-03-29 | Three air-blowing concentrated reburning NOx-reducing discharge device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2539908Y true CN2539908Y (en) | 2003-03-12 |
Family
ID=33695495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02216516 Expired - Fee Related CN2539908Y (en) | 2002-03-29 | 2002-03-29 | Three air-blowing concentrated reburning NOx-reducing discharge device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2539908Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1299047C (en) * | 2004-12-10 | 2007-02-07 | 清华大学 | Separation device of storehouse type powdered coal boiler powder making system powder sending air laeking |
| CN103697465A (en) * | 2012-09-27 | 2014-04-02 | 烟台龙源电力技术股份有限公司 | Boiler capable of achieving reignition of exhaust gas coal powder and reducing NOx by using high-temperature flue gas |
| CN105465772A (en) * | 2015-04-28 | 2016-04-06 | 无锡华光锅炉股份有限公司 | Tertiary-air staged combustion device |
| CN105465814A (en) * | 2015-03-30 | 2016-04-06 | 无锡华光锅炉股份有限公司 | Branched structure of primary air pulverized coal pipe |
| CN105937760A (en) * | 2016-06-08 | 2016-09-14 | 无锡华光锅炉股份有限公司 | Dense-thin tertiary air switching device |
-
2002
- 2002-03-29 CN CN 02216516 patent/CN2539908Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1299047C (en) * | 2004-12-10 | 2007-02-07 | 清华大学 | Separation device of storehouse type powdered coal boiler powder making system powder sending air laeking |
| CN103697465A (en) * | 2012-09-27 | 2014-04-02 | 烟台龙源电力技术股份有限公司 | Boiler capable of achieving reignition of exhaust gas coal powder and reducing NOx by using high-temperature flue gas |
| CN105465814A (en) * | 2015-03-30 | 2016-04-06 | 无锡华光锅炉股份有限公司 | Branched structure of primary air pulverized coal pipe |
| CN105465772A (en) * | 2015-04-28 | 2016-04-06 | 无锡华光锅炉股份有限公司 | Tertiary-air staged combustion device |
| CN105937760A (en) * | 2016-06-08 | 2016-09-14 | 无锡华光锅炉股份有限公司 | Dense-thin tertiary air switching device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |