CN106051785A - Method for reducing NOx emission during sludge incineration - Google Patents
Method for reducing NOx emission during sludge incineration Download PDFInfo
- Publication number
- CN106051785A CN106051785A CN201610348963.XA CN201610348963A CN106051785A CN 106051785 A CN106051785 A CN 106051785A CN 201610348963 A CN201610348963 A CN 201610348963A CN 106051785 A CN106051785 A CN 106051785A
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- CN
- China
- Prior art keywords
- discharge
- sludge incineration
- reduces
- incineration
- mud
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- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/70—Blending
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/80—Shredding
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2204/00—Supplementary heating arrangements
- F23G2204/10—Supplementary heating arrangements using auxiliary fuel
- F23G2204/101—Supplementary heating arrangements using auxiliary fuel solid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/12—Sludge, slurries or mixtures of liquids
Abstract
The invention provides a method for reducing NOx emission during sludge incineration. The method comprises the following steps that sludge and coal powder are uniformly mixed and then ground into fuel powder; and the fuel powder is incinerated at the temperature of 1200 DEG C, and the sum of the supply quantity of main combustion zone air and the supply quantity of over fire air is controlled to be 1.23 times of the theoretical air quantity. Compared with the prior art, the method for reducing NOx emission during sludge incineration has the following beneficial effects that under the incineration condition that the water content and the blending incineration ratio are high and the sludge is mixed with the coal powder, low-concentration NOx is produced at the same time, and a co-firing way which is high in economic value and small in pollution is provided for thermal power plant sludge blending incineration.
Description
Technical field
The present invention relates to a kind of mud low NO with coal multifuel combustionxCombustion method, is mainly used in coal dust station boiler, coal
Powder blends the process of mud multifuel combustion.
Background technology
State Council the most formally issues " water prevention and cure of pollution action plan " (being called for short " ten, water "), and " ten, water " clearly to push away
Enter specific resistance to filtration.Existing specific resistance to filtration facility should be basically completed transformation up to standard before the end of the year 2017, region and more than
Municipal sludge harmless treatment disposal rate should reach more than 90% before at the bottom of the year two thousand twenty.But be off 2010, China's mud without
Evilization handling rate is less than 25%.Sludge treatment has become a great problem that current China faces.
At present, sludge ultimate disposal mode mainly includes landfill, Land_use change and anhydration and incineration.Wherein, Land_use change meeting
Environment is produced secondary pollution, is prohibitted the use of by Countries and area.Landfill stabilization can take a large amount of land resource, no
It is suitable for the current national conditions of China.Comparatively speaking, anhydration and incineration is that application is relatively broad at present, treatment effect one side more thoroughly
Method, but burning facility construction investment is big, and energy consumption is high, and operating cost is expensive, and the multiple pollutant matter in incineration tail gas processes
Cost is high, and the method for anhydration and incineration awaits improving further.
Mentioning in " urban wastewater treatment firm specific resistance to filtration technical manual (trying) " within 2011, printed and distributed should be preferentially sharp
Process mud with local cement or thermoelectricity industry kiln resource, reduce the investment of sludge treatment facility.Utilize collaborative place of steam power plant
Put the harmlessness disposing that mud is mud and provide new approach, the steam that steam power plant produces on the one hand can be utilized as mummification
Mud thermal source, on the other hand can utilize the mud after steam power plant's stove burning and drying, and the tail gas of generation is also via steam power plant
Exhaust treatment system is disposed, and has saved equipment investment and operating cost.
Studying more boiler at present is CFBB, and relatively fewer for coal-powder boiler research.In coal-powder boiler
Mud mixes the moisture content of burning and mixed-fuel burning proportion directly affect mummification institute heat dissipation can and the stability run of system, such as drying sludge base
Middle nitrogen content is higher than coal, it will usually increase nitrogen oxides in effluent (NOx) concentration.It is necessary to select suitable boiler to burn
Parameter and mud are mixed burning condition and are controlled to mix burning to NOxThe impact of discharge.
Summary of the invention
For the problems referred to above, it is an object of the invention to provide a kind of multifuel combustion high-moisture mud, realize low NO simultaneouslyxGenerate
Combustion method, be applied in coal-fired power station boiler, the coal used is the volatile matter bituminous coal more than 25wt.%.
The present invention is achieved by the following technical solutions:
A kind of sludge incineration reduces NOxThe method of discharge, it comprises the steps:
After mud and coal blending, it is milled into fuel powder；
Being burned at 1200 DEG C by described fuel powder, the wind supply quantity sum controlling primary zone wind and burnout degree is theoretical
1.23 times of air capacity (air capacity required when i.e. fuel is completely and no oxygen remains).
Preferably, the water content of described mud not higher than 30wt.%, nitrogen content are 3.0wt.%.
Preferably, the volatile matter of described coal dust is not less than as 25wt.%, nitrogen content is 1.0wt.%.
Preferably, the weight ratio of described mud and coal dust is less than 1:9.
Preferably, the mean diameter of described fuel powder is 75 μm.
Preferably, described burnout degree accounts for the ratio of total blast volume is 20～40vol.%.
Preferably, the burning of described fuel powder is carried out in coal dust furnace, described coal dust furnace bag
Include burner hearth, burner, after-flame airduct.
Preferably, the spout of described after-flame airduct and the distance of burner can make primary zone gas residence time
2.5s。
Preferably, the powder amount of entering during described fuel powder enters burner hearth is 2kg/h.
Preferably, the spout of described after-flame airduct and the distance of burner are 1.5m, described primary zone wind and stove
The distance of thorax outlet is 2m, and the time of staying of primary zone wind is 2.5 seconds.
Preferably, the heater element of described burner is globar.
Compared with prior art, the present invention has a following beneficial effect:
When carrying out mud with the multifuel combustion of coal, the water content of mud is the key factor affecting economy, mud during multifuel combustion
Water content require the lowest, before multifuel combustion, the processing cost of mud is the highest, and this combustion method determines that multifuel combustion sludge moisture content can reach
30wt.%, in the case of this, mud outside moisture is less, within being limited in 10wt.% with the mixed proportion of coal, is mixed with coal by mud
Sending into coal pulverizer pulverizing after conjunction, the water content impact overall on fuel combination is limited, and the impact of exerting oneself on flour mill can obtain
Effective control；The water content of handled mud is of a relatively high, requires low to sludge drying device, and the energy needed for mummification
Few, higher economy can be obtained；Multifuel combustion ratio is set in 10wt.%, simultaneously on the impact burnt during reduction mud multifuel combustion；
Air classification is the combustion technology scheme that highly volatile fuel burning commonly uses, and mud is mixed by this combustion method on this basis
The technical parameter combusting coal is determined, the coal-fired bituminous coal for volatile matter more than 25wt.%, under this combustion parameter, permissible
Nitrogen oxide emission during mud multifuel combustion is controlled individually burning in similar scope to coal, what mud was processed
Meanwhile, the cost that flue gas pollutant controls is reduced.
Accompanying drawing explanation
Fig. 1 be the present invention sludge incineration in reduce NOxThe process chart of the method for discharge；
Fig. 2 is that in the present invention, mud mixes discharged nitrous oxides curve when coal multifuel combustion individually burns with coal.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.Following example will assist in the technology of this area
Personnel are further appreciated by the present invention, but limit the present invention the most in any form.It should be pointed out that, the ordinary skill to this area
For personnel, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement.These broadly fall into the present invention
Protection domain.
Embodiment 1
The combustion test of the present embodiment is fuel combustion process phase in a kind of fuel combustion process is with coal-fired power station boiler
As coal dust furnace carries out.Technological process as it is shown in figure 1, selecting water content is the mud of 30wt.%, mud nitrogenous
Amount is about 3.0wt.%, and selective volatilization is divided into the coal of 27wt.%, and the nitrogen content of coal dust is about 1.0wt.%.Mud is pressed with coal
According to the quality of 1:9 than mix homogeneously, grinding, mean diameter 75 μm in coal pulverizer, fuel powder passes through batcher entering with 2kg/h
Powder amount sends into burner hearth, and the air supplied by burner is primary zone wind, and the air supplied by after-flame airduct is burnout degree, and two
Person's wind supply quantity sum is the air equivalent ratio of 1.23.Fire air nozzle is 1.5m with the distance of burner, makes stopping of primary zone wind
Stay the time about 2.5 seconds, distance furnace outlet 2m.Whole burner hearth is heated by one group of globar, for simulation coal fired power plant pot
Stove fire box temperature, is set in 1200 DEG C.
As in figure 2 it is shown, when the air quantity of burnout degree supply accounts for the 20～40% of total blast volume, mud is with generation during coal multifuel combustion
Nitrous oxides concentration in flue gas, the nitrous oxides concentration produced during with individually burning coal is similar, it is contemplated that the nitrogen content of mud
For about 3 times of coal, this kind of combustion system makes the concentration of emission of nitrogen oxides obtain effective control, beneficially mud to exist with coal
The application of multifuel combustion in coal fired power plant.
In sum, only presently preferred embodiments of the present invention, not it is used for limiting the scope that the present invention implements, all depends on
Equalization change and the modification that shape, structure, feature and spirit described in scope of the invention as claimed is done, all should be included in this
In the right of invention.
Claims (10)
1. a sludge incineration reduces NOxThe method of discharge, it is characterised in that comprise the steps:
After mud and coal blending, it is milled into fuel powder；
Being burned at 1200 DEG C by described fuel powder, the wind supply quantity sum controlling primary zone wind and burnout degree is theoretical air
1.23 times of amount.
2. sludge incineration as claimed in claim 1 reduces NOxThe method of discharge, it is characterised in that the water content of described mud
Not higher than 30wt.%, nitrogen content are 3.0wt.%.
3. sludge incineration as claimed in claim 1 reduces NOxThe method of discharge, it is characterised in that the volatile matter of described coal dust
Be not less than 25wt.%, nitrogen content is 1.0wt.%.
4. sludge incineration as claimed in claim 1 reduces NOxThe method of discharge, it is characterised in that described mud and coal dust
Weight ratio is less than 1:9.
5. sludge incineration as claimed in claim 1 reduces NOxThe method of discharge, it is characterised in that described fuel powder average
Particle diameter is 75 μm.
6. sludge incineration as claimed in claim 1 reduces NOxThe method of discharge, it is characterised in that described burnout degree accounts for after-flame
The ratio of wind and primary zone wind summation is 20～40vol.%.
7. sludge incineration as claimed in claim 1 reduces NOxThe method of discharge, it is characterised in that the burning of described fuel powder
Carrying out in coal dust furnace, described coal dust furnace includes burner hearth, burner and after-flame airduct.
8. sludge incineration as claimed in claim 7 reduces NOxThe method of discharge, it is characterised in that described fuel powder enters stove
Powder amount of entering in thorax is 2kg/h.
9. sludge incineration as claimed in claim 7 reduces NOxThe method of discharge, it is characterised in that the spray of described after-flame airduct
Mouth is 1.5m with the distance of burner, and described primary zone wind is 2m with the distance of furnace outlet, and the time of staying of primary zone wind
It it is 2.5 seconds.
10. the sludge incineration as according to any one of claim 7～9 reduces NOxThe method of discharge, it is characterised in that described
The heater element of burner is globar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610348963.XA CN106051785A (en) | 2016-05-24 | 2016-05-24 | Method for reducing NOx emission during sludge incineration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610348963.XA CN106051785A (en) | 2016-05-24 | 2016-05-24 | Method for reducing NOx emission during sludge incineration |
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| Publication Number | Publication Date |
|---|---|
| CN106051785A true CN106051785A (en) | 2016-10-26 |
Family
ID=57175148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201610348963.XA Pending CN106051785A (en) | 2016-05-24 | 2016-05-24 | Method for reducing NOx emission during sludge incineration |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6085674A (en) * | 1999-02-03 | 2000-07-11 | Clearstack Combustion Corp. | Low nitrogen oxides emissions from carbonaceous fuel combustion using three stages of oxidation |
| CN204086237U (en) * | 2014-06-03 | 2015-01-07 | 广东电网公司电力科学研究院 | The research experiment system of a kind of mud and coal mixed combustion mercury in flue gas release characteristics |
| CN104964286A (en) * | 2015-05-19 | 2015-10-07 | 华中科技大学 | Sludge treatment method capable of reducing discharge of nitrogen oxide in pulverized coal boiler at the same time |
-
2016
- 2016-05-24 CN CN201610348963.XA patent/CN106051785A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6085674A (en) * | 1999-02-03 | 2000-07-11 | Clearstack Combustion Corp. | Low nitrogen oxides emissions from carbonaceous fuel combustion using three stages of oxidation |
| CN204086237U (en) * | 2014-06-03 | 2015-01-07 | 广东电网公司电力科学研究院 | The research experiment system of a kind of mud and coal mixed combustion mercury in flue gas release characteristics |
| CN104964286A (en) * | 2015-05-19 | 2015-10-07 | 华中科技大学 | Sludge treatment method capable of reducing discharge of nitrogen oxide in pulverized coal boiler at the same time |
Non-Patent Citations (2)
| Title |
|---|
| 刘蕴芳等: "煤粉炉掺烧干化污泥的污染物排放研究", 《环境工程学报》 * |
| 魏刚等: "生物质混燃与空气分级对NOx排放的影响", 《热力发电》 * |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20170602 Address after: 200439 Shanghai city Baoshan District Yixian Road No. 2816 building floor room A006 Applicant after: Bao Group Environmental Resources Technology Co., Ltd. Address before: 201900 No. 889 Yang Yang Road, Shanghai, Baoshan District Applicant before: Baogang Development Co., Ltd. |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20161026 |