CN110173981A - A kind of low nitrogen combustion apparatus and method of pelletizing rotary kiln - Google Patents
A kind of low nitrogen combustion apparatus and method of pelletizing rotary kiln Download PDFInfo
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- CN110173981A CN110173981A CN201910293790.XA CN201910293790A CN110173981A CN 110173981 A CN110173981 A CN 110173981A CN 201910293790 A CN201910293790 A CN 201910293790A CN 110173981 A CN110173981 A CN 110173981A
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- rotary kiln
- cylinder
- low nitrogen
- pelletizing
- wind
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/34—Arrangements of heating devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0033—Heating elements or systems using burners
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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 low nitrogen combustion apparatus of pelletizing rotary kiln and methods, belong to rotary kiln energy-conserving and emission-cutting technology field, including rotary kiln kiln body and drying grate, further include the rotary kiln four-channel swirling burner being arranged in rotary kiln kiln body；Four channels difference Transfer center wind, axis stream wind, coal gas of converter and the coke-stove gas of the rotary kiln four-channel swirling burner；The rotary kiln four-channel swirling burner includes the cylindrical body that middle position is arranged in；The large aperture cylinder of cylindrical body being provided centrally with for Transfer center wind is around evenly equipped with multiple small-bore cylinders for the axis stream wind that circulates；The first cylinder for circulate coal gas of converter coaxial with cylindrical body is provided with outside cylindrical body；The second cylinder for circulate coke-stove gas coaxial with the first cylinder is provided with outside the first cylinder.The low nitrogen combustion apparatus and method of a kind of pelletizing rotary kiln provided by the invention, from source reduce pelletizing tail gas in NOXConcentration, make NOXReach discharge standard.
Description
Technical field
The invention belongs to rotary kiln energy-conserving and emission-cutting technology fields, and in particular to a kind of low nitrogen combustion apparatus of pelletizing rotary kiln
And method.
Background technique
With being on the rise for industrialization NOx emission pollution, country increases the control to NOx emission.Existing pelletizing
Production line uses chain grate machine-rotary kiln-ring cold machine-desulfurizing tower production technology, and fuel is based on coal gas of converter, coke-stove gas
Supplemented by, and desulfurization uses quick lime method.It is measured through desulfurizing tower on-line gas analysis instrument, tail gas NOx concentration under normal production scenarios
In 260-300mg/m3.And the coal gas of converter pressure oscillation used is bigger, the coke-stove gas pressure wave as supplemental heat source
It is dynamic also bigger, cause rotary system temperature unstable, various air quantity change greatly.Cooling can only be taken in NOx superelevation
The method of the underproduction affects going on smoothly for production.If not adopting an effective measure reduces NOx, it will face Chinese Ministry of Environmental Protection at once
Door orders the punishment of halt production.
The factor of NOx concentration is influenced mainly with the presence of the following aspects: the problem of 1. former burner: used at present
When coal gas of converter uses original blast furnace gas channel, since former blast furnace gas channel cross-sectional area is small, it be easy to cause flow less than normal,
Calorific value is insufficient: when coal gas of converter pressure is low, it is also necessary to supplement the coke-stove gas of 2000m3/h or so.And NOx is primarily generated at
The high-temperature region of flame, when temperature reaches 1300 DEG C, exponentially power rises NOx concentration, the high heating value flame zone of coke-stove gas
It is the main region that NOx is generated.
2. the hot wind in rotary kiln is logical since the junction between kiln body tail portion and drying grate is there are biggish difference in height
When preheating toward drying grate to green-ball, wind speed is unsmooth, and heat distribution is unreasonable, to guarantee that drying grate pre-heat effect need to will be in kiln
Temperature increases, and increases exhausting amount, and it is excessively high that this has also further resulted in kiln temperature.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of low nitrogen combustion apparatus of pelletizing rotary kiln and methods, from source
The concentration that NOx in pelletizing tail gas is reduced on head, makes NOx reach discharge standard.
In order to solve the above technical problems, the technical scheme adopted by the invention is that:
A kind of low nitrogen combustion apparatus of pelletizing rotary kiln, including rotary kiln kiln body and drying grate further include that a setting is being turned round
Rotary kiln four-channel swirling burner in kiln kiln body, four channels difference Transfer center wind of the rotary kiln four-channel swirling burner,
Axis stream wind, coal gas of converter and coke-stove gas；The rotary kiln four-channel swirling burner includes the cylindrical body that middle position is arranged in；Circle
The large aperture cylinder of cylinder being provided centrally with for Transfer center wind is around evenly equipped with multiple apertures for the axis stream wind that circulates
Diameter cylinder；The first cylinder for circulate coal gas of converter coaxial with cylindrical body is provided with outside cylindrical body；It is arranged outside the first cylinder
There is the second cylinder for circulate coke-stove gas coaxial with the first cylinder.
Technical solution of the present invention further improvement lies in that: the barrel of the second cylinder is provided with uniformly distributed hollow cuboid wind
Road.
Technical solution of the present invention further improvement lies in that: the first fan blade is provided between the first cylinder and cylindrical body,
The second fan blade is provided between two cylinders and the first cylinder.
Technical solution of the present invention further improvement lies in that: the channel internal diameter of the rotary kiln four-channel swirling burner be φ
780mm。
Technical solution of the present invention further improvement lies in that: Transfer center wind, axis stream wind, coal gas of converter and coke-oven coal respectively
Four air ducts large aperture cylinder, cylindrical body, the first cylinder and the second cylinder of gas are successively progressive outward one section of extension area, prolongs
It is consistent with along wind emission direction to stretch area direction.
Technical solution of the present invention further improvement lies in that: be provided with outside the bottom of the rotary kiln four-channel swirling burner with
Itself parallel air hose, there are two Hand-operated butterfly valves for setting on air hose, connect respectively with the extension area of the second cylinder and large aperture cylinder
It is logical.
A kind of low nitrogen burning method of pelletizing rotary kiln adjusts air-fuel ratio using rotary kiln four-channel swirling burner, extends fire
Flame length is into rotary kiln, combustion-supporting process of the Discrete control combustion air in kiln, inhibits to reduce NOx generation.
Technical solution of the present invention further improvement lies in that: the adjustment air-fuel ratio is that combustion air is gradually mixed into coal gas and penetrates
Stream controls the mixed process of burner region fuel and combustion air, extends burning time of origin.
By adopting the above-described technical solution, the technological progress achieved by the present invention is:
A kind of rotary kiln four-channel swirling burner of the low nitrogen combustion apparatus of pelletizing rotary kiln provided by the invention is by adjusting burning
The ratio of device centre wind, axis stream wind realizes drive of the flame in high pressure center wind of the coal gas of converter and coke-stove gas that are sparged into
It is lower to extend to position in kiln forward, so that high-temperature region in kiln is extended 2-3 meters or so into kiln；The extension of axis stream wind outer wall can
Extend air-flow to be formed, elongate combustion process, keep the shape of flame approximate " writing brush head ", avoids concentrated combustion from generating part high
Temperature is uniformly distributed calory burning, to reduce the generation of flame high-temperature area thermal NO x to the greatest extent.Combustion-supporting Secondary Air eddy flow control
System reduces combustion-supporting Secondary Air dosage, makes to form anaerobic environment in secondary combustion region, inhibits the further generation of NOx.Pass through temperature
It spends field simulation and rationally designs burner air duct, grading control combustion air amount controls reasonable air-fuel ratio, guarantees higher burning
Efficiency reduces excessive air and enters in kiln, can reduce by 20% or so NOx, further suppresses generation of the NOx in kiln.
Above-mentioned various measures make high-temperature region in rotary kiln reduce 50 DEG C, have saved energy consumption, restrained effectively the generation of NOx.
A kind of low nitrogen combustion apparatus of pelletizing rotary kiln provided by the invention, passes through making for rotary kiln four-channel swirling burner
With increasing the aisle spare of coal gas of converter, coal gas of converter flow reaches 7000-8000m3/h, 1000m3/h is increased than originally
Left and right；Coke-stove gas usage amount reduces, and 500m3/h or so is reduced than originally, the coke-stove gas for being easy to produce localized hyperthermia
Dosage is controlled minimum；Increased first fan blade and the second fan blade mix coke oven can from exit with coal gas of converter, change
Flame profile originally, flame sectional area increase, disperses combustion, and the coke-stove gas concentrated combustion that calorific value is excessively high in local is avoided to produce
Raw excessive thermal NO x, kiln flame high-temperature region temperature are reduced to 1380 DEG C or so from 1430 DEG C.
A kind of low nitrogen burning method of pelletizing rotary kiln provided by the invention, controls the mistake of burning from the source of burning
Journey, heat obtain reasonable layout, reduce the generation of flame high-temperature area thermal NO x, while controlling reasonable air-fuel ratio again, protect
Demonstrate,prove higher efficiency of combustion.The content of pelletizing kiln tail gas NOx is reduced to 50mg/m3Left and right, reduces exhaust-gas treatment cost, drops
The low pollution to environment.
Detailed description of the invention
Fig. 1 is that the structure of the rotary kiln four-channel swirling burner of the low nitrogen combustion apparatus of pelletizing rotary kiln provided by the invention is shown
It is intended to；
Fig. 2 is the sectional view of the rotary kiln four-channel swirling burner of the low nitrogen combustion apparatus of pelletizing rotary kiln provided by the invention；
Fig. 3 is the side view of the rotary kiln four-channel swirling burner of the low nitrogen combustion apparatus of pelletizing rotary kiln provided by the invention；
Wherein, 1, cylindrical body, 2, the first cylinder, the 3, first fan blade, 4, the second cylinder, the 5, second fan blade, 6, hollow cuboid wind
Road, 7, large aperture cylinder, 8, small-bore cylinder, 10, Hand-operated butterfly valve, 11, air hose.
Specific embodiment
The formation of NOx and ignition temperature and burning condition are closely related, can by the transformation to burner, air-fuel ratio
Adjustment, setting segmentation auxiliary thermal source, realizes total system sectional combustion, and the generation of NOx is reduced from burning source.Below with reference to attached
Figure and embodiment are described in further details the present invention.
In conjunction with the knot of the rotary kiln four-channel swirling burner of the low nitrogen combustion apparatus of the pelletizing rotary kiln provided by the invention of attached drawing 1
Structure schematic diagram and attached drawing 2 are cutting for the rotary kiln four-channel swirling burner of the low nitrogen combustion apparatus of pelletizing rotary kiln provided by the invention
Shown in the figure of face, a kind of low nitrogen combustion apparatus of pelletizing rotary kiln, including rotary kiln kiln body and drying grate, it further include that a setting exists
Rotary kiln four-channel swirling burner in rotary kiln kiln body.Distinguish Transfer center in four channels of the rotary kiln four-channel swirling burner
Wind, axis stream wind, coal gas of converter and coke-stove gas.
The rotary kiln four-channel swirling burner includes the cylindrical body 1 that middle position is arranged in；Cylindrical body 1 is provided centrally with
For the large aperture cylinder 7 of Transfer center wind, it is around evenly equipped with multiple small-bore cylinders 8 for the axis stream wind that circulates；Cylindrical body 1
It is provided with the first cylinder 2 for circulate coal gas of converter coaxial with cylindrical body 1 outside；It is provided with outside the first cylinder 2 and the first circle
The coaxial the second cylinder 4 for the coke-stove gas that circulates of cylinder 2.The barrel of the second cylinder 4 is provided with uniformly distributed hollow cuboid wind
Road 6.It is provided with the first fan blade 3 between the first cylinder 2 and cylindrical body 1, is provided with second between the second cylinder 4 and the first cylinder 2
Fan blade 5.In embodiment provided by the invention, the channel internal diameter of the rotary kiln four-channel swirling burner is φ 780mm.
Further, four air ducts large aperture cylinder of difference Transfer center wind, axis stream wind, coal gas of converter and coke-stove gas
7, cylindrical body 1, the first cylinder 2 and the second cylinder 4 are successively progressive outward one section of extension area, and extension area direction is sprayed with along wind
Direction is consistent.
In conjunction with the side of the rotary kiln four-channel swirling burner of the low nitrogen combustion apparatus of the pelletizing rotary kiln provided by the invention of attached drawing 3
View is provided with the air hose 11 parallel with itself outside the bottom of the rotary kiln four-channel swirling burner, is provided with two on air hose 11
A Hand-operated butterfly valve 10, is connected to the extension area of the second cylinder 4 and large aperture cylinder 7 respectively.
Specifically, the rotary kiln four-channel swirling burner of φ 780mm reduces First air aisle spare, increase centre wind,
Axis stream wind, that is, First air pressure；The channel outer wall of axis stream wind further includes one section of extension area, and extension area is the outer of axis stream wind channel
A Duan Yanshen of the wall on wind emission direction.Kiln hood secondary air inlet reduces 20%, realizes combustion air gradually in burner outlet
It is mixed into coal gas jet stream, controls the mixed process of burner region fuel and combustion air, extends burning time of origin.Pass through heating power
It learns emulation and carries out reasonable structure design, control the momentum of burner throat fuel and air and the flow direction of each jet stream,
The generation of NOx can be effectively suppressed.
Further, fuel and air (First air) mixture and the Secondary Air of reflux form just combustion zone, due to secondary
The cyclonic action of wind forms a recirculating zone, heats and First air is made to catch fire, and the major part of volatile matter and nitrogen component is in this area
Middle precipitation, but because limiting conversion of the nitrogen component to NOx among oxygen debt and high CO, CmHn concentration.Secondary Air II is from first
The outside of beginning combustion zone is mixed into, and forms after-flame region, and in this secondary combustion region, uncombusted fuel is completed it and slowly fired
Process, low oxygen concentration can also inhibit the generation of NOx to the greatest extent.
A kind of low nitrogen burning method of pelletizing rotary kiln；Utilize the rotary kiln four-way of the low nitrogen combustion apparatus of pelletizing rotary kiln
Road burner and rotary kiln, drying grate.Using rotary kiln four-channel swirling burner, air-fuel ratio is adjusted, extends the length of flame to revolution
In kiln, by combustion-supporting process of the segmentation auxiliary thermal source grading control combustion air in kiln, inhibit to reduce NOx generation.The adjustment
Air-fuel ratio is that combustion air is gradually mixed into coal gas jet stream, controls the mixed process of burner region fuel and combustion air, extends
Burn time of origin.
Specifically, being mounted with the coke-stove gas burner of 2 125 ㎜ of Ф in drying grate head panel, it is laid with gas piping,
Coke-stove gas is guided to drying grate head by installation and adjustment valve, blank-plate valve, using kiln tail chute cooling blower with addition of combustion air.?
In embodiment provided by the invention, which can provide the coke-stove gas of 200-1200m3/h for drying grate.
Increase segmentation auxiliary combustion burner in the present invention at drying grate head panel, is provided for drying grate preheating, dryer section
The calorific value of the coke-stove gas of 200-1200m3/h, can effectively improve drying grate drying and preheating effect, reduce rotary kiln indirectly
Interior calcining section localized hyperthermia, reasonable supplement utilize heat.This transformation meet production, guarantee equipment run well while,
The 1# petticoat pipe temperature of drying grate is by improving 80 DEG C, and calcining belt temperature reduces 1270 DEG C or so from 1320 DEG C in kiln, to subtract
The generation of NOx is lacked.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (8)
1. a kind of low nitrogen combustion apparatus of pelletizing rotary kiln, including rotary kiln kiln body and drying grate, it is characterised in that: further include one
A rotary kiln four-channel swirling burner being arranged in rotary kiln kiln body, four channels difference of the rotary kiln four-channel swirling burner
Transfer center wind, axis stream wind, coal gas of converter and coke-stove gas；
The rotary kiln four-channel swirling burner includes the cylindrical body (1) that middle position is arranged in；Cylindrical body (1) is provided centrally with
For the large aperture cylinder (7) of Transfer center wind, it is around evenly equipped with multiple small-bore cylinders (8) for the axis stream wind that circulates；Circle
The first cylinder (2) for circulate coal gas of converter coaxial with cylindrical body (1) is provided with outside cylinder (1)；The first cylinder (2) peripheral hardware
It is equipped with the second cylinder (4) for circulate coke-stove gas coaxial with the first cylinder (2).
2. a kind of low nitrogen combustion apparatus of pelletizing rotary kiln according to claim 1, it is characterised in that: the second cylinder (4)
Barrel be provided with uniformly distributed hollow cuboid air duct (6).
3. a kind of low nitrogen combustion apparatus of pelletizing rotary kiln according to claim 1, it is characterised in that: the first cylinder (2)
It is provided between cylindrical body (1) the first fan blade (3), is provided with the second fan blade between the second cylinder (4) and the first cylinder (2)
(5).
4. a kind of low nitrogen combustion apparatus of pelletizing rotary kiln according to claim 1, it is characterised in that: the rotary kiln four
The channel internal diameter of channel burner is φ 780mm.
5. a kind of low nitrogen combustion apparatus of pelletizing rotary kiln according to claim 1, it is characterised in that: Transfer center respectively
Wind, axis stream wind, coal gas of converter and four air ducts large aperture cylinder (7) of coke-stove gas, cylindrical body (1), the first cylinder (2) and
Two cylinders (4) are successively progressive outward one section of extension area, and extension area direction is consistent with along wind emission direction.
6. a kind of low nitrogen combustion apparatus of pelletizing rotary kiln according to claim 5, it is characterised in that: the rotary kiln four
It is provided with outside the bottom of channel burner the air hose parallel with itself (11), there are two Hand-operated butterfly valves for setting on air hose (11)
(10), it is connected to respectively with the extension area of the second cylinder (4) and large aperture cylinder (7).
7. a kind of low nitrogen burning method of pelletizing rotary kiln, it is characterised in that: utilize rotary kiln four-channel swirling burner, adjust air-fuel
Than extending the length of flame into rotary kiln, combustion-supporting process of the Discrete control combustion air in kiln inhibits to reduce NOx generation.
8. a kind of low nitrogen burning method of pelletizing rotary kiln according to claim 7, it is characterised in that: the adjustment air-fuel
Than being gradually mixed into coal gas jet stream for combustion air, the mixed process of burner region fuel and combustion air is controlled, burning is extended
Time of origin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910293790.XA CN110173981A (en) | 2019-04-12 | 2019-04-12 | A kind of low nitrogen combustion apparatus and method of pelletizing rotary kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910293790.XA CN110173981A (en) | 2019-04-12 | 2019-04-12 | A kind of low nitrogen combustion apparatus and method of pelletizing rotary kiln |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110173981A true CN110173981A (en) | 2019-08-27 |
Family
ID=67689844
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910293790.XA Withdrawn CN110173981A (en) | 2019-04-12 | 2019-04-12 | A kind of low nitrogen combustion apparatus and method of pelletizing rotary kiln |
Country Status (1)
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| CN (1) | CN110173981A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111500856A (en) * | 2020-05-27 | 2020-08-07 | 成渝钒钛科技有限公司 | Auxiliary burner chain grate for vanadium-titanium pellet production and use method |
| CN111910071A (en) * | 2020-09-11 | 2020-11-10 | 黄湛明 | Grate-rotary kiln pellet low NOx production system |
| CN113970104A (en) * | 2020-07-22 | 2022-01-25 | 中冶长天国际工程有限责任公司 | Shaft type kiln body air inlet dangerous waste incineration system and dangerous waste incineration method |
-
2019
- 2019-04-12 CN CN201910293790.XA patent/CN110173981A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111500856A (en) * | 2020-05-27 | 2020-08-07 | 成渝钒钛科技有限公司 | Auxiliary burner chain grate for vanadium-titanium pellet production and use method |
| CN111500856B (en) * | 2020-05-27 | 2022-01-25 | 成渝钒钛科技有限公司 | Auxiliary burner chain grate for vanadium-titanium pellet production and use method |
| CN113970104A (en) * | 2020-07-22 | 2022-01-25 | 中冶长天国际工程有限责任公司 | Shaft type kiln body air inlet dangerous waste incineration system and dangerous waste incineration method |
| CN113970104B (en) * | 2020-07-22 | 2023-06-23 | 中冶长天国际工程有限责任公司 | Dangerous waste incineration system and method for shaft kiln body air inlet |
| CN111910071A (en) * | 2020-09-11 | 2020-11-10 | 黄湛明 | Grate-rotary kiln pellet low NOx production system |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190827 |
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| WW01 | Invention patent application withdrawn after publication |