CN203784993U - Seven-section combustion furnace chamber structure for controlling generation of nitrogen oxides - Google Patents
Seven-section combustion furnace chamber structure for controlling generation of nitrogen oxides Download PDFInfo
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- CN203784993U CN203784993U CN201420217633.3U CN201420217633U CN203784993U CN 203784993 U CN203784993 U CN 203784993U CN 201420217633 U CN201420217633 U CN 201420217633U CN 203784993 U CN203784993 U CN 203784993U
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- hogging
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- arch
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- nitrogen oxide
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Abstract
The utility model provides a seven-section combustion furnace chamber structure for controlling the generation of nitrogen oxides, and relates to the technical field of boilers in the coal-fired industry. According to the structure, the nitrogen characteristic that nitrogen oxides can only be generated under the environments of high temperature and oxidation is adopted, a 7-shaped middle arch is specially arranged between a front arch and a back arch in a furnace chamber, and the furnace chamber is divided into a front area, a back area and an upper area, and totally seven sections, and each area and section are endowed with different functions, so that the different air volume and the temperature can be controlled by subsection air supply devices in various areas, and the purpose of controlling the generation rate of the nitrogen oxide NOx to realize the pollution reduction emission can be achieved, According to the technology provided by the utility model, the mode that treatment is performed after the nitrogen oxide NOx is generated is changed in the mode that the treatment is performed before the nitrogen oxide NOx is generated, so that the generation of the nitrogen oxide NOx can be controlled by a simple method, and the purpose of clean coal combustion of the boilers in coal-fired industries is achieved.
Description
Technical field
The present invention relates to coal-burned industrial boiler technical field, specifically a kind of seven section burner hearth structures that can control nitrogen oxide generation.
Background technology
Premier Li Keqiang has proposed the requirement of declaring a war to haze in the government work report.And coal-burned industrial boiler is one of main source of atmospheric pollution of current China, reduce haze, must take out as soon as possible resolution and step up and administer.
Grate firing structure in mediumand smallscale industrial boilers, utilizes fuel at stove chamber inner combustion, discharges a large amount of heat and generates carbon dioxide.Coal, from entering burner hearth to all burnt, generally will experience four-stage: 1. moisture evaporation drying.When temperature reaches 105 ℃ of left and right, moisture is all evaporated.2. fugitive constituent catches fire the stage.Coal constantly absorbs after heat, and temperature continues to rise, and volatile matter is separated out thereupon, and when temperature reaches ignition point, volatile matter takes fire, and volatile matter burning velocity is fast, and general is only coal 1/10 left and right of whole burning time.3. char combustion stage.After volatile matter ignition in coal, the solids that remaining carbon and ash form is coke.Now coke temperature rising is very fast, and fixed carbon acutely burns, and emits a large amount of heats.Burning of coal speed and burn degree and depend primarily on this stage.4. burn the stage.This stage burns down the coke in lime-ash as far as possible, to reduce boiler heat loss, raises the efficiency.Good burning must possess three conditions: 1, temperature.Temperature is higher, and chemical reaction velocity is fast, and burning is just faster.Grate furnace temperature is conventionally at 1100--1300 ℃.2, air.Air washes away that the speed of carbon surface is faster, and carbon contacts better with oxygen, and burning is just faster.3, the time.Make coal in burner hearth, have enough burning times.
In the process of carbon burning release heat, not only generate carbon dioxide, and under the condition of oxidation atmosphere and high temperature, airborne nitrogen and dioxygen oxidation generate nitrogen oxide-NO
x, as N
2+ 20
2=2NO
2, N
2+ O
2=2NO.
NO, NO
2be commonly referred to nitrogen oxide-NO
x, temperature is higher--1350 ℃ above, oxidation atmosphere is stronger, the nitrogen oxide of generation is more.The discharge of nitrogen oxide is the primary pollution source after boiler combustion.Once and nitrogen oxide generates, intractability and processing cost are all very large, so, how to suppress the generation of nitrogen oxide, reduce the discharge of nitrogen oxide, be a main control project of polluting of current coal-burned industrial boiler.
Summary of the invention
The present invention is according to carbon and nitrogen combustion characteristics and formation condition, utilize nitrogen under high temperature and oxidation environment, could generate the special characteristics of nitrogen oxide, special one " ┐ " shape hogging between face arch in burner hearth and rear arch, be designed to seven special section burner hearth structures, burner hearth is divided into seven, three regions section and gives different functions, make it to pass through to control different air quantity and temperature at different sections, thereby reach, control nitrogen oxide-NO
xgrowing amount, realize to reduce the object of disposal of pollutants.The technology of the present invention is by nitrogen oxide-NO
xgenerate post processing and become generation pre-treatment, in simple mode, controlled nitrogen oxide-NO
xgeneration, reach the object of coal-burned industrial boiler clean combustion.
The technical solution used in the present invention is: special one " ┐ " shape hogging between the face arch in burner hearth and rear arch, and a stalk is vertically downward arranged at the bottom of " ┐ " shape hogging, on stalk and fire grate, between coal seam, has neutral gear, exports after forming CO; The upper lateral of " ┐ " shape hogging turns forward, and burner hearth is divided into forward and backward, upper three regions; In forefoot area, between face arch, " ┐ " shape hogging and fire grate, form coal drying section, the fugitive constituent section of catching fire, carbon burning section and CO accumulation region; In rear region, between rear arch, " ┐ " shape hogging and fire grate, form burning segment and peroxide district; In upper region, face arch, rear arch and " ┐ " shape hogging form CO combustion zone.
The front end exit aspect ratio face arch of described " ┐ " shape hogging to go out open height low, thereby form outlet before CO, the upper rear end of " ┐ " shape hogging is lower than the outlet of rear arch, higher than the rear end of rear arch.
The present invention compares with former technology, the one, special one " ┐ " shape hogging between the face arch of the present invention in traditional coal-burned industrial boiler burner hearth and rear arch, is divided into three regions burner hearth, and changing former four sections of burnings is seven sections burnings, make burning more abundant, utilization rate is also just higher.
The 2nd, in combustion process, can effectively control the formation condition of nitrogen oxide, thereby the growing amount of controlling nitrogen oxide, reduces the disposal of pollutants of coal-burned industrial boiler, to reduce the formation condition of haze weather, realize the object of coal-burned industrial boiler clean combustion, effectively promote social benefit.
The 3rd, by the transformation to chamber structure, nitrogen oxide is generated to post processing and become generation pre-treatment, the generation of having controlled nitrogen oxide in simple mode, this mode of simplifying has not only reduced the intractability of nitrogen oxide, also promoted treatment effect, can also save a large amount of human and material resources and equipment investment by avoiding nitrogen oxide to generate post processing simultaneously, there is obvious economic benefit.
Accompanying drawing explanation
Fig. 1 is chamber structure schematic diagram of the present invention.
In figure, before the 1. coal drying section 2. fugitive constituent section of catching fire 3. face arch 4.CO accumulation region 5.CO, after outlet 6. carbon burning section 7.CO combustion zone 8. " ┐ " shape hogging 9. fire grate 10.CO, export 11.CO
2export 12. peroxide district 13. segmentation air supply device 14. burning segment 15. rear arch 16. boiler components.
The specific embodiment
As shown in Figure 1, special one " ┐ " shape hogging 8 between face arch 3 in burner hearth and rear arch 15, the upper rear end of special " ┐ " shape hogging 8 is lower than the outlet of rear arch 15, rear end than rear arch 15 is high, the front end exit aspect ratio face arch 3 of special " ┐ " shape hogging 8 to go out open height low, thereby export 5 before forming CO, one stalk is vertically downward arranged at the bottom of special " ┐ " shape hogging 8, on stalk and fire grate 9, between coal seam, there is neutral gear, after forming CO, export 10, the upper lateral of special " ┐ " shape hogging 8 turns forward, before burner hearth is divided into, after, upper three regions.
In forefoot area, between face arch 3, " ┐ " shape hogging 8 and fire grate 9, form coal drying section 1, the fugitive constituent section of catching fire 2, carbon burning section 6 and CO accumulation region 4.In this region, by segmentation air supply device 13, the air door of coal drying section 1 and the fugitive constituent section of catching fire 2 is adjusted by normal chain fire-gate combustion system.When coal enters coal drying section 1, when temperature reaches 105 ℃ of left and right, moisture is all evaporated, after entering the fugitive constituent section of catching fire 2, coal constantly absorbs heat, and temperature continues to rise, volatile matter is separated out thereupon, when temperature reaches ignition point, volatile matter takes fire, but now coal is just lighted a fire, the temperature in coal seam is lower, volatile matter burning velocity is fast again, and 1000 ℃ of ignition temperature less thaies, cannot produce NO
x; When coal enters into carbon burning section 6, because there being the radiant heat of face arch 3 and " ┐ " shape hogging 8, and there is no the heat absorption of water-cooling wall, coal layer temperature increased fast, lower floor's coal high-velocity combustion generates CO in a large number
2, after the air door of carbon burning section 6 being turned down by segmentation air supply device 13, control upper strata coal excess air factor and be less than 1, make scorching hot carbon on upper strata combustion product CO with lower floor not enough in oxygen
2be reduced to CO and absorb heat, the CO being reduced gathers in a large number in CO accumulation region 4, though now in the high-temperature region of carbon burning section 6, because burning situation is the reduction in the situation that, NO
xformation condition is controlled, and is difficult to generate NO
x.
In rear region, between rear arch 15, " ┐ " shape hogging 8 and fire grate 9, form burning segment 14He peroxide district 12.In this region, burning segment 14 burns away the C not burnt, but because the storage of C is less, the CO that exports 10 outflows from CO is also few, although the air door of burning segment 14 is tuned up by segmentation air supply device 13, makes excess air factor be greater than 1, Dan Yin peroxide district 12 combustion powered deficiencies, in addition the CO in peroxide district 12 is diluted by Wind Volume, and ignition temperature is below 1200 ℃, NO
xformation condition is not enough, is also difficult to generate NO
x.
In upper region, face arch 3, rear arch 15 form CO combustion zone 7 with " ┐ " shape hogging 8.In this region, a large amount of CO exports 5 and pours into CO combustion zone 7 from CO, and the oxygen gas that Bing Yucong peroxide district 12 comes is in the interior mixing in CO combustion zone 7.When CO enters CO combustion zone 7 and mixes with oxygen gas while burning away, because there being the reason of water-cooling wall heat absorption, fire box temperature can be too not high, generally at 1000 ℃ of left and right, NO
xformation condition is controlled by water-cooling wall heat absorption, makes NO
xgrowing amount drops to minimum.
Claims (2)
1. control the seven section burner hearth structures that nitrogen oxide generates, it is characterized in that: special one " ┐ " shape hogging (8) between the face arch in burner hearth (3) and rear arch (15), one stalk is vertically downward arranged at the bottom of " ┐ " shape hogging (8), stalk and fire grate (9) have neutral gear between upper coal seam, outlet (10) after formation CO; The upper lateral of " ┐ " shape hogging (8) turns forward, and burner hearth is divided into forward and backward, upper three regions; In forefoot area, between face arch (3), " ┐ " shape hogging (8) and fire grate (9), form coal drying section (1), the fugitive constituent section of catching fire (2), carbon burning section (6) and CO accumulation region (4); In rear region, between rear arch (15), " ┐ " shape hogging (8) and fire grate (9), form burning segment (14) and peroxide district (12); In upper region, face arch (3), rear arch (15) form CO combustion zone (7) with " ┐ " shape hogging (8).
2. according to claim 1ly control the seven section burner hearth structures that nitrogen oxide generates, be further characterized in that: the front end exit aspect ratio face arch (3) of described " ┐ " shape hogging (8) to go out open height low, thereby export (5) before forming CO, the upper rear end of " ┐ " shape hogging (8) is lower than the outlet of rear arch (15), higher than the rear end of rear arch (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420217633.3U CN203784993U (en) | 2014-04-30 | 2014-04-30 | Seven-section combustion furnace chamber structure for controlling generation of nitrogen oxides |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420217633.3U CN203784993U (en) | 2014-04-30 | 2014-04-30 | Seven-section combustion furnace chamber structure for controlling generation of nitrogen oxides |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203784993U true CN203784993U (en) | 2014-08-20 |
Family
ID=51321173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420217633.3U Expired - Fee Related CN203784993U (en) | 2014-04-30 | 2014-04-30 | Seven-section combustion furnace chamber structure for controlling generation of nitrogen oxides |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203784993U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105588115A (en) * | 2016-02-19 | 2016-05-18 | 卢长柱 | Efficient, low-nitrogen, low-sulfur, low-dust and large-capacity layer-combustion boiler and combustion method |
-
2014
- 2014-04-30 CN CN201420217633.3U patent/CN203784993U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105588115A (en) * | 2016-02-19 | 2016-05-18 | 卢长柱 | Efficient, low-nitrogen, low-sulfur, low-dust and large-capacity layer-combustion boiler and combustion method |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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: 20140820 Termination date: 20170430 |