CN107036081A - A kind of fractional combustion heating furnace and the method that denitration in the stove is realized with it - Google Patents
A kind of fractional combustion heating furnace and the method that denitration in the stove is realized with it Download PDFInfo
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- CN107036081A CN107036081A CN201710424264.3A CN201710424264A CN107036081A CN 107036081 A CN107036081 A CN 107036081A CN 201710424264 A CN201710424264 A CN 201710424264A CN 107036081 A CN107036081 A CN 107036081A
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- heating furnace
- fuel
- zone
- primary
- combustion chamber
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
- F23C3/002—Combustion apparatus characterised by the shape of the combustion chamber the chamber having an elongated tubular form, e.g. for a radiant tube
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J7/00—Arrangement of devices for supplying chemicals to fire
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2201/00—Staged combustion
- F23C2201/10—Furnace staging
- F23C2201/101—Furnace staging in vertical direction, e.g. alternating lean and rich zones
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2201/00—Staged combustion
- F23C2201/30—Staged fuel supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
- F23C2900/03009—Elongated tube-shaped combustion chambers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
Abstract
The invention discloses a kind of fractional combustion heating furnace, including main body, combustion chamber, hemispherical furnace roof and regenerator, combustion chamber is respectively equipped with primary fuel entrance, secondary fuel entrance, air intake and medicament spray orifice from bottom to top, and the present invention reaches the purpose of denitration in the stove by the method for fractional combustion.The beneficial effects of the invention are as follows：Designed using vertical shaft furnace, body of heater there are enough spaces so that each combustion zone is well defined, and each zonal combustion atmosphere is controllable, ignition temperature is less than 1100 DEG C, and the growing amount of nitrogen oxides is few, in addition, medicament spray orifice is set up, the nitrogen oxides generated can be further reduced.The present invention from burning when and burn latter two stage denitration, denitration effect substantially, nitrogen oxide in tail gas content be less than 150mg/m3, drastically reduce the area the discharge capacity of nitrogen oxides.
Description
Technical field
The present invention relates to field of furnaces, more particularly to a kind of fractional combustion heating furnace and the side that denitration in the stove is realized with it
Method.
Background technology
In recent years, with haze large area, prolonged appearance, country is administered to air and the requirement of environmental protection is lifted
To a new height.One of atmosphere pollution main source is industrial combustion waste gas.Generally to the processing of industrial combustion waste gas
It is dedusting, but the processing to wherein pernicious gas is but very limited, nitrogen oxides, sulfide and other harmful gas in waste gas
Body is directly discharged in air, and in line nitrogen oxides of exhaust gas content is up to 3000mg/m3, far beyond national 420mg/
m3Discharge standard, serious destruction is brought to environment, and nitrogen oxides can form acid rain and photochemical fog, moreover it is possible to destroy smelly
Oxygen layer, therefore, should try one's best and reduce the discharge of nitrogen oxides, i.e., carry out denitration to industrial waste gas.
The difference originated according to nitrogen, denitration is divided into denitration after denitration before burning, combustion process denitration and burning.Burning
Preceding denitration is mainly the denitration to the solid burning article of the Nitrogen elements such as coal；For gaseous fuel, using air as combustion adjuvant
In the case of, the nitrogen in air is the source of nitrogen, and such case is applicable combustion process denitration；Denitration refers to after burning
Reducing substances is added in combustion tail gas nitrogen oxides is reduced into nitrogen.
For the burner using gaseous fuel, when ignition temperature is higher than 1500 DEG C, the generating rate meeting of nitrogen oxides
Substantially increase, therefore, reduction ignition temperature is combustion process denitration conventional means.The general method using sectional combustion, passes through
The ratio of different combustion phases fuel and air is controlled to reduce ignition temperature, so as to reduce the generation of nitrogen oxides.It is existing to adopt
With the usual small volume of the burner of sectional combustion, such as internal combustion engine, or use due to the limitation of application places horizontal put
Put, be the drawbacks of said burner it is combustion and segmented not substantially temperature is difficult to control, it is and de- after can not being burnt to tail gas
Nitre, causes denitration effect bad, and discharged nitrous oxides reducing effect can not meet existing pollutant emission standard.
The content of the invention
For the deficiency in prior art burner structure, the present invention provides a kind of fractional combustion heating furnace and realized with it
The method of denitration in the stove, to solve the above problems.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：
A kind of fractional combustion heating furnace, including main body 1, combustion chamber 2, hemispherical furnace roof 3 and regenerator 4；Wherein, main body 1
For cylinder, inside there is the refractory brick barricade 11 contour with main body 1, the inner space of the main body is divided into by refractory brick barricade 11
Combustion chamber 2 and regenerator 4, the upper end of main body 1 and the airtight connection of hemispherical furnace roof 3；On the outer wall of combustion chamber 2 bottom-up successively
It is set to be furnished with primary fuel entrance 21, secondary fuel entrance 22, air intake 23 and medicament spray orifice 24, primary fuel entrance 21
Igniter, is primary zone A, secondary fuel entrance 22 and air intake between primary fuel entrance 21 and secondary fuel entrance 22
It is burning-out zone C between reburning zone B, air intake 23 to the upper end of combustion chamber 2 to be between 23, and medicament spray orifice 24 is located at combustion chamber 2
The top of outer wall.
Further, the internal diameter of main body 1 is 6-6.5m, and the primary zone A, reburning zone B and burning-out zone C are highly than being A:B:
C=1:1:4.
Preferably, A=3m, B=3m, during C=12m, denitration effect is optimal, and ignition temperature is less than 1100 DEG C, nitrogen oxides
Content is less than 150mg/m3。
Further, the primary fuel entrance 21 is located in the middle of the combustion chamber 2, the secondary fuel entrance 22 and described
23 points of row both sides of combustion chamber 2 of air intake；The primary fuel entrance 21, secondary fuel entrance 22 and air intake 23 are straight
Footpath is respectively 200mm, 200mm and 400mm.
Further, the medicament spray orifice 24 is 2 groups, and cross direction profiles are in the both sides of combustion chamber 2, medicament spray orifice described in every group
24 are made up of 5 circular holes laterally arranged, and the Circularhole diameter is 50mm.
Further, the fuel that the fractional combustion heating furnace is used is gaseous fuel, such as biogas, gas, natural air-liquid
Change gas etc..
The present invention also provides a kind of method for realizing denitration in the stove using above-mentioned fractional combustion heating furnace, including following step
Suddenly：
1) according to the property of fuel, it is 1.02-1.07 to determine Overall excess air coefficient, 70% and air of total fuel
By volume 1:1-1:1.5 mixing, the primary zone A is filled with by the primary fuel entrance 21, meanwhile, remaining 30%
Fuel is filled with the reburning zone B from the secondary fuel entrance 22, while being filled with fuel, starts the igniter；
2) after igniting 2-4s, surplus air is filled with the burning-out zone C by the air intake (23).
Further, when fume emission index can not meet environmental requirement at this stage, in step 2) it is filled with surplus air
Meanwhile, start medicament ejector system, by the medicament spray orifice (24) while spraying into reproducibility medicament to burning-out zone end.
The beneficial effects of the invention are as follows：Designed using vertical shaft furnace, body of heater there are enough spaces so that each combustion zone
It is well defined, each zonal combustion atmosphere is controllable, ignition temperature is less than 1100 DEG C, and the growing amount of nitrogen oxides is few；Reburning zone is only filled
Enter fuel, be not filled with air, form very strong reducing atmosphere, the nitrogen oxides generated in primary zone is reduced to nitrogen；Combustion
Area to the greatest extent is only filled with burnout degree, under the conditions of normal excess air (excess coefficient 1.1), makes unburned carbon monoxide and flying dust
In carbon burning completely, realize and the purpose of nitrogen oxides in effluent content be greatly reduced.Medicament spray orifice is set up, can be in environmental protection index
After tightening up, by spraying into out of stock medicament in burning-out zone end, the low-concentration nitrogen oxide further remained in reduction flue gas is realized
The minimum discharge of nitrogen oxides in effluent.The present invention from burning when and burn latter two stage denitration, denitration effect substantially, do not spray
Enter denitration medicament and nitrogen oxide in tail gas content can be achieved less than 150mg/m3。
Brief description of the drawings
Fig. 1 is a kind of front view of fractional combustion heating furnace of the invention.
Fig. 2 is a kind of top view of fractional combustion heating furnace of the invention.
Reference：
Main body 1；
Refractory brick barricade 11；
Combustion chamber 2；
Primary fuel entrance 21；
Secondary fuel entrance 22；
Air intake 23；
Medicament spray orifice 24；
Hemispherical furnace roof 3；
Regenerator 4.
Embodiment
The principle and feature of the present invention are described below in conjunction with accompanying drawing, the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
Embodiment 1
Shown in reference picture 1, the present embodiment is related to a kind of fractional combustion heating furnace with concrete structure.The fractional combustion
Heating furnace, including main body 1, combustion chamber 2, hemispherical furnace roof 3 and regenerator 4, wherein, main body 1 is cylinder, is inside had and main body 1
The inner space of the main body is divided into combustion chamber and regenerator, main body by contour refractory brick barricade 11, refractory brick barricade 11
Be sequentially provided with bottom-up on upper end and hemispherical furnace roof airtight connection, the outer wall of combustion chamber primary fuel entrance 21, two grades
It is furnished with igniter, primary fuel entrance and institute in fuel inlet 22, air intake 23 and medicament spray orifice 24, primary fuel porch
It is primary zone A to state between secondary fuel entrance, is reburning zone B between secondary fuel entrance and air intake, and air intake is to firing
It is burning-out zone C between burning room upper end, medicament spray orifice is located at the top of the outer wall of combustion chamber.
Wherein：
The inner major diameter is 6-6.5m；The region height：Primary zone A=3m, reburning zone B=3m, burning-out zone C=
12m；
The primary fuel entrance is located in the middle of the combustion chamber, the secondary fuel entrance and the air intake point row
The combustion chamber both sides, the primary fuel entrance, secondary fuel entrance and air inlet diameter be respectively 200mm, 200mm and
400mm；
The medicament spray is 2 groups, and cross direction profiles are in the combustion chamber both sides, and medicament spray orifice 24 described in every group is by 5 transverse directions
The circular hole composition of arrangement, the Circularhole diameter is 50mm.
Using above-mentioned fractional combustion heating furnace carry out denitration in the stove method, the fractional combustion heating furnace use gas for
Fuel, combustion adjuvant is air, is comprised the following steps that：
1) total excess air coefficient is 1.05, is converted according to the calorific value of fuel, and the component to fuel and air is carried out
Simplify processing, each component is as shown in table 1,
The each component volume fraction of table 1
| Component | H2 | CH4 | CO | O2 | CO2 | N2 |
| Volume fraction | 0.2084 | 0.1216 | 0.0898 | 0.0194 | 0.1824 | 0.3784 |
70% and air of total fuel by volume 1:1.2 are filled with the primary zone A by the primary fuel entrance,
Meanwhile, remaining 30% fuel is entered from the secondary fuel and is filled with the reburning zone B, while being filled with fuel, is started described
Igniter；
2) after igniting 2-4s, surplus air is filled with the burning-out zone C by the air intake 23.
When fume emission index can not meet environmental requirement at this stage, start medicament ejector system, pass through the medicament
Spray orifice (24) to burning-out zone end while spray into medicament.
The combustion case in above-mentioned each region of combustion process is simulated with CHEMKIN softwares：
Primary zone
Excess air coefficient is 0.85, because primary zone is the burning condition of fuel-rich oxygen deprivation, so NO2Growing amount very
Few, nitrogen oxides main component is NO, and the main reaction being related to is：N2+O2=2NO, the NO molal volume fractions of generation are
870ppm.Calculated by said components, NO molal volume fractions are up to 3100ppm if not by the way of the fractional combustion.
Reburning zone
The NO reduction that remaining 30% fuel can generate primary zone is added, the reaction being related to is：
NO+CH=HCN+O
NO+CH2=HOCN+H
NO+CH2(S)=HCN+OH
NO+CH3=HCN+H2O
NO+CH3=H2CN+HO
NO+HO2=NO2+OH
Reduction by reproducibility fuel to NO, reburning zone NO molal volumes fraction can be down to tens ppm.
Burning-out zone
Remaining air is passed through by unburned sufficient fuel after-flame, the process inevitably generates a part of NO, most
Amount of nitrogen oxides is less than 150mg/m in whole combustion tail gas3。
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (9)
1. a kind of fractional combustion heating furnace, including main body (1), combustion chamber (2), hemispherical furnace roof (3) and regenerator (4), described
Main body (1) is cylinder, inside there is a refractory brick barricade (11) contour with the main body (1), and the refractory brick barricade (11) is by institute
The inner space for stating main body (1) is divided into the combustion chamber (2) and regenerator (4), main body (1) upper end and the hemispherical
Furnace roof (3) airtight connection, it is characterised in that be sequentially provided with primary fuel bottom-up on the outer wall of the combustion chamber (2) and enter
Mouth (21), secondary fuel entrance (22), air intake (23) and medicament spray orifice (24), primary fuel entrance (21) place is furnished with
Igniter, is primary zone A, the secondary fuel between the primary fuel entrance (21) and the secondary fuel entrance (22)
It is reburning zone B between entrance (22) and the air intake (23), the air intake (23) arrives the combustion chamber (2) upper end
Between be burning-out zone C, the medicament spray orifice (24) be located at the combustion chamber (2) outer wall top.
2. fractional combustion heating furnace according to claim 1, it is characterised in that main body (1) internal diameter is 6-6.5m, institute
Primary zone A, reburning zone B and burning-out zone C are stated highly than being A:B:C=1:1:4.
3. fractional combustion heating furnace according to claim 2, it is characterised in that the primary zone A, reburning zone B and after-flame
Area C is highly respectively：A=3m, B=3m, C=12m.
4. the fractional combustion heating furnace according to claim any one of 1-3, it is characterised in that the primary fuel entrance
(21) it is located in the middle of the combustion chamber (2), the secondary fuel entrance (22) and the burning of the air intake (23) point row
Room (2) both sides, the primary fuel entrance (21), secondary fuel entrance (22) and air intake (23) diameter be respectively 200mm,
200mm and 400mm.
5. the fractional combustion heating furnace according to claim any one of 1-3, it is characterised in that the medicament spray orifice (24) is
2 groups, cross direction profiles are made up of in the combustion chamber (2) both sides, medicament spray orifice (24) described in every group 5 circular holes laterally arranged,
The Circularhole diameter is 50mm.
6. the fractional combustion heating furnace according to claim any one of 1-3, it is characterised in that the fractional combustion heating furnace
Fuel used is gaseous fuel.
7. fractional combustion heating furnace according to claim 6, it is characterised in that the gaseous fuel is biogas, gas, day
One kind in right air-liquid gas.
8. the method that fractional combustion heating furnace described in a kind of usage right requirement 1 realizes denitration in the stove, it is characterised in that including such as
Lower step：
1) according to the property of fuel, it is 1.02-1.07 to determine Overall excess air coefficient, and 70% and air of total fuel are pressed body
Product compares 1:1-1:1.5 mixing, the primary zone A is filled with by the primary fuel entrance (21), meanwhile, remaining 30% combustion
Material is filled with the reburning zone B from the secondary fuel entrance (22), while being filled with fuel, starts the igniter；
2) after igniting 2-4s, surplus air is filled with the burning-out zone C by the air intake (23).
9. the method that fractional combustion heating furnace according to claim 8 realizes denitration in the stove, it is characterised in that the step
2) while being filled with the surplus air, reproducibility medicament is filled with from medicament spray orifice (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710424264.3A CN107036081B (en) | 2017-06-07 | 2017-06-07 | Staged combustion heating furnace and method for realizing denitration in furnace by using staged combustion heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710424264.3A CN107036081B (en) | 2017-06-07 | 2017-06-07 | Staged combustion heating furnace and method for realizing denitration in furnace by using staged combustion heating furnace |
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| CN107036081A true CN107036081A (en) | 2017-08-11 |
| CN107036081B CN107036081B (en) | 2023-10-03 |
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| CN201710424264.3A Active CN107036081B (en) | 2017-06-07 | 2017-06-07 | Staged combustion heating furnace and method for realizing denitration in furnace by using staged combustion heating furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019057108A1 (en) * | 2017-09-22 | 2019-03-28 | 邹立松 | Denitration process and device, combustion power generation process and system, electric vehicle and aerostat |
| CN113446598A (en) * | 2021-05-26 | 2021-09-28 | 山西河坡发电有限责任公司 | Low-nitrogen combustion zone control method under full load of CFB boiler |
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| JPH07103409A (en) * | 1993-10-05 | 1995-04-18 | Tokyo Gas Co Ltd | In-furnace denitrizing additional firing system |
| EP0756135A1 (en) * | 1995-07-27 | 1997-01-29 | Tokyo Gas Company Limited | A low nitrogen oxide producing burner system and burning method |
| CN101097060A (en) * | 2006-06-30 | 2008-01-02 | 中国科学院工程热物理研究所 | Coal firing method with low discharged nitrous oxides |
| CN101290117A (en) * | 2008-05-26 | 2008-10-22 | 上海电力学院 | Recombustion burner and its application method |
| CN102563690A (en) * | 2012-02-08 | 2012-07-11 | 河南电力试验研究院 | Method for controlling emission of nitrogen oxide of coal burning boiler |
| CN203432315U (en) * | 2013-08-08 | 2014-02-12 | 珠海市威望节能科技有限公司 | Aluminum smelting furnace staged oxygen-deficient combustion device |
-
2017
- 2017-06-07 CN CN201710424264.3A patent/CN107036081B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07103409A (en) * | 1993-10-05 | 1995-04-18 | Tokyo Gas Co Ltd | In-furnace denitrizing additional firing system |
| EP0756135A1 (en) * | 1995-07-27 | 1997-01-29 | Tokyo Gas Company Limited | A low nitrogen oxide producing burner system and burning method |
| CN101097060A (en) * | 2006-06-30 | 2008-01-02 | 中国科学院工程热物理研究所 | Coal firing method with low discharged nitrous oxides |
| CN101290117A (en) * | 2008-05-26 | 2008-10-22 | 上海电力学院 | Recombustion burner and its application method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019057108A1 (en) * | 2017-09-22 | 2019-03-28 | 邹立松 | Denitration process and device, combustion power generation process and system, electric vehicle and aerostat |
| CN113446598A (en) * | 2021-05-26 | 2021-09-28 | 山西河坡发电有限责任公司 | Low-nitrogen combustion zone control method under full load of CFB boiler |
| CN113446598B (en) * | 2021-05-26 | 2022-10-04 | 山西河坡发电有限责任公司 | Low-nitrogen combustion zone control method under full load of CFB boiler |
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