CN103925611A - Seven-segment combustion furnace chamber structure choking nitrogen oxide generation - Google Patents
Seven-segment combustion furnace chamber structure choking nitrogen oxide generation Download PDFInfo
- Publication number
- CN103925611A CN103925611A CN201410179278.XA CN201410179278A CN103925611A CN 103925611 A CN103925611 A CN 103925611A CN 201410179278 A CN201410179278 A CN 201410179278A CN 103925611 A CN103925611 A CN 103925611A
- Authority
- CN
- China
- Prior art keywords
- coal
- hogging
- shape
- nitrogen oxide
- arch
- 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.)
- Pending
Links
Abstract
The invention discloses a seven-segment combustion furnace chamber structure choking nitrogen oxide generation and belongs to the technical field of fire coal industrial boilers. The characteristic that nitrogen can generate nitrogen oxide only under high-temperature and oxidized environment is used, so that an inverted-L type middle arch is specially manufactured between a front arch and a rear arch inside a furnace chamber, the furnace chamber is divided into a front zone, a rear zone and an upper zone, wherein the three zones comprise seven segments which are endowed with different functions, different air amounts and temperatures are controlled through a segmented air supply device in the different segments, and therefore the purposes that nitrogen oxide-NOx generation is choked, and pollutant discharge is reduced are achieved. According to the technology, nitrogen oxide-NOx after-generation processing is changed into pre-generation processing, nitrogen oxide- NOx generation is choked in a simple mode, and the purpose of clean combustion of the fire coal industrial boiler 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.In the time that temperature reaches 105 DEG C 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 in the time that 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. the char combustion stage.After volatile matter ignition in coal, the solids of remaining carbon and ash composition is coke.Now coke temperature rise 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 DEG C.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 DEG C 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 must 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, control nitrogen oxide-NO thereby reach
xgrowing amount, realize and 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, controlled nitrogen oxide-NO in simple mode
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 this region, coal is in the time of coal drying section, and Yin Wendu is very low, can not produce NO
x; When coal enters the fugitive constituent section of catching fire, because coal is just lighted a fire, at this moment the temperature of coal layer is also lower, and combustion powered deficiency also can not produce NO
x; When coal enters after carbon burning section, because there being the radiant heat of face arch and " ┐ " shape hogging, 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, when controlling after intake, make excess air factor be less than 1, scorching hot carbon on upper strata is not enough because of oxygen and the combustion product CO of lower floor
2be reduced to CO, and absorb heat, at this moment, in the high-temperature region of carbon burning section, because burning situation is in the situation that reducing, be difficult to generate NO
x; In rear region, between rear arch, " ┐ " shape hogging and fire grate, form burning segment and peroxide district; In this region, burning segment burns away the C not burnt, but because the storage of C is less, the CO that outlet is flowed out from CO is also few, thereby the combustion powered deficiency in peroxide district, and CO is diluted by Wind Volume in peroxide district in addition, temperature, below 1200 DEG C, is also difficult to generate NO
x; In upper region, face arch, rear arch and " ┐ " shape hogging composition CO combustion zone; In this region, a large amount of CO exports and pours into CO combustion zone from CO, and while burning away in CO combustion zone mixing with the oxygen gas of coming from peroxide district, because there being the reason of water-cooling wall heat absorption, fire box temperature is generally at 1000 DEG C of left and right, NO
xformation condition deficiency, makes NO
xgrowing amount reduces.
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 is compared 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 control the growing amount of nitrogen oxide, reduce 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, controlled the generation of nitrogen oxide in simple mode, this mode of simplifying has not only reduced the intractability of nitrogen oxide, also promote 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.
Brief description of the drawings
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.
Detailed description of the invention
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 by normal chain fire-gate combustion system adjustment.When coal enters coal drying section 1, when temperature reaches 105 DEG C of left and right, moisture is all evaporated, when entering after 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 DEG C of ignition temperature less thaies, cannot produce NO
x; In the time that 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 14 and 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, but because of the combustion powered deficiency in peroxide district 12, in addition diluted by Wind Volume at the CO in peroxide district 12, ignition temperature below 1200 DEG C, NO
xformation condition deficiency, 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 mixes CO combustion zone 7 is interior with the oxygen gas of coming from peroxide district 12.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 DEG C 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 (3) in burner hearth 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 this region, coal is when coal drying section (1), and Yin Wendu is very low, can not produce NO
x; In the time that coal enters the fugitive constituent section of catching fire (2), because coal is just lighted a fire, at this moment the temperature of coal layer is also lower, and combustion powered deficiency also can not produce NO
x; When coal enters after 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, when controlling after intake, make excess air factor be less than 1, scorching hot carbon on upper strata is not enough because of oxygen and the combustion product CO of lower floor
2be reduced to CO, and absorb heat, at this moment, in the high-temperature region of carbon burning section (6), because burning situation is in the situation that reducing, be difficult to generate NO
x; In rear region, between rear arch (15), " ┐ " shape hogging (8) and fire grate (9), form burning segment (14) and 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 outlet (10) is flowed out from CO is also few, thereby the combustion powered deficiency in peroxide district (12), in addition CO is diluted by Wind Volume in peroxide district (12), and temperature, below 1200 DEG C, is also difficult to generate NO
x; In upper region, face arch (3), rear arch (15) and " ┐ " shape hogging (8) composition CO combustion zone (7); In this region, a large amount of CO exports (5) and pours into CO combustion zone (7) from CO, and while burning away in CO combustion zone (7) mixing with the oxygen gas of coming from peroxide district (12), because there being the reason of water-cooling wall heat absorption, fire box temperature is generally at 1000 DEG C of left and right, NO
xformation condition deficiency, makes NO
xgrowing amount reduces.
2. seven section burner hearth structures of controlling nitrogen oxide generation according to claim 1, 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 |
|---|---|---|---|
| CN201410179278.XA CN103925611A (en) | 2014-04-30 | 2014-04-30 | Seven-segment combustion furnace chamber structure choking nitrogen oxide generation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410179278.XA CN103925611A (en) | 2014-04-30 | 2014-04-30 | Seven-segment combustion furnace chamber structure choking nitrogen oxide generation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103925611A true CN103925611A (en) | 2014-07-16 |
Family
ID=51143914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410179278.XA Pending CN103925611A (en) | 2014-04-30 | 2014-04-30 | Seven-segment combustion furnace chamber structure choking nitrogen oxide generation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103925611A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106949458A (en) * | 2016-10-20 | 2017-07-14 | 陕西火王能源科技有限责任公司 | A kind of double-layered furnace arch combustion chamber biomass chain-grate boiler |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1079287A (en) * | 1992-05-26 | 1993-12-08 | 李靖宇 | Cooling truss hogging grate firing boiler combustion chamber |
| JPH08247423A (en) * | 1995-03-07 | 1996-09-27 | Nkk Corp | Dual-flow type garbage incinerator |
| CN1963306A (en) * | 2006-11-17 | 2007-05-16 | 徐克勤 | Small-sized industrial boiler hearth |
| CN101539304A (en) * | 2009-04-29 | 2009-09-23 | 许元凯 | Biomass combustion special furnace |
| CN201731479U (en) * | 2010-03-20 | 2011-02-02 | 王震坤 | Biomass fuels enhanced combustion boiler |
| CN102252320A (en) * | 2011-06-25 | 2011-11-23 | 山东百川同创能源有限公司 | Biomass low-nitrogen direct combustion boiler |
| CN102494332A (en) * | 2011-12-27 | 2012-06-13 | 赵晨 | Energy-saving chain-grate boiler |
| CN203464323U (en) * | 2013-07-15 | 2014-03-05 | 尤凯军 | Novel environmental protection boiler with boiler internal smoke and dust abatement clean burning |
-
2014
- 2014-04-30 CN CN201410179278.XA patent/CN103925611A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1079287A (en) * | 1992-05-26 | 1993-12-08 | 李靖宇 | Cooling truss hogging grate firing boiler combustion chamber |
| JPH08247423A (en) * | 1995-03-07 | 1996-09-27 | Nkk Corp | Dual-flow type garbage incinerator |
| CN1963306A (en) * | 2006-11-17 | 2007-05-16 | 徐克勤 | Small-sized industrial boiler hearth |
| CN101539304A (en) * | 2009-04-29 | 2009-09-23 | 许元凯 | Biomass combustion special furnace |
| CN201731479U (en) * | 2010-03-20 | 2011-02-02 | 王震坤 | Biomass fuels enhanced combustion boiler |
| CN102252320A (en) * | 2011-06-25 | 2011-11-23 | 山东百川同创能源有限公司 | Biomass low-nitrogen direct combustion boiler |
| CN102494332A (en) * | 2011-12-27 | 2012-06-13 | 赵晨 | Energy-saving chain-grate boiler |
| CN203464323U (en) * | 2013-07-15 | 2014-03-05 | 尤凯军 | Novel environmental protection boiler with boiler internal smoke and dust abatement clean burning |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106949458A (en) * | 2016-10-20 | 2017-07-14 | 陕西火王能源科技有限责任公司 | A kind of double-layered furnace arch combustion chamber biomass chain-grate boiler |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204084334U (en) | Steam combustion-supportinburner living beings second gasification stove | |
| CN105090993A (en) | Built-in comprehensive drying and incinerating system for sludge and drying and incinerating method for sludge | |
| CN101097065A (en) | Boiler using biomass as fuel | |
| CN106352343A (en) | Gasifying incinerator applicable to household garbage with high heat value | |
| CN105588115B (en) | The low low dirt Large Copacity grate firing boiler of nitrogen low-sulfur and combustion method | |
| CN203785241U (en) | Thrice combusting hot-air boiler | |
| CN2924321Y (en) | Boiler utilizing biomass as fuel | |
| CN103206703B (en) | Biomass smoke boiler | |
| CN102679390A (en) | Compound furnace arch and compound secondary air structure for cooperatively controlling generation of nitrogen oxide (NOX) | |
| CN203784993U (en) | Seven-section combustion furnace chamber structure for controlling generation of nitrogen oxides | |
| CN103925611A (en) | Seven-segment combustion furnace chamber structure choking nitrogen oxide generation | |
| CN104180375A (en) | Smokeless dust-collecting refuse incinerator adopting cracking process | |
| CN203147751U (en) | Furnace air distribution device for biomass circulating fluidized bed boiler | |
| CN102192591A (en) | Vertical biomass hot blast heater | |
| CN102798129B (en) | Efficient thermal oxidation furnace for low afterburning-amount smoke constant-speed grading reaction | |
| CN106382623B (en) | New energy intelligence bispin boiler | |
| CN202074687U (en) | Vertical biomass hot blast furnace | |
| CN205619555U (en) | Coal -fired heating equipment of clean briquette coal production line industrial furnace | |
| CN203464323U (en) | Novel environmental protection boiler with boiler internal smoke and dust abatement clean burning | |
| CN105349158A (en) | Method and vertical flue bottom structure for reducing production of nitrogen oxides by coke oven | |
| CN203810879U (en) | Diffusion type coal injection burning furnace of drying machine | |
| CN202109469U (en) | Horizontal type biomass fuel boiler | |
| CN206739279U (en) | A kind of more gradient burners of the high effect cleaning of coal | |
| CN206094892U (en) | Ultramarine calcination shuttle kiln | |
| CN205746991U (en) | Multifunctional environment protection energy saving biomass gasification combustion furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140716 |