CN105385462A - Method capable of effectively reducing nitrogen oxide in coke oven - Google Patents
Method capable of effectively reducing nitrogen oxide in coke oven Download PDFInfo
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- CN105385462A CN105385462A CN201510874341.6A CN201510874341A CN105385462A CN 105385462 A CN105385462 A CN 105385462A CN 201510874341 A CN201510874341 A CN 201510874341A CN 105385462 A CN105385462 A CN 105385462A
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Abstract
The invention relates to a method capable of effectively reducing nitrogen oxide in a coke oven. The method allows the point of blending of air and combustible gas in a vertical flue to move upward so as to delay blending combustion of the air and combustible gas. Specifically, for a coke oven utilizing lean gas for heating, a distance between a combustible gas inlet and an air inlet at the bottom of the vertical flue is allowed to be no less than 70 mm, or a nose bridge brick is allowed to be no less than 80 mm higher than the bottom of the vertical flue; for a coke oven utilizing rich gas for heating, the distance between the combustible gas inlet and the air inlet at the bottom of the vertical flue is allowed to be no less than 170 mm; and for a coke oven having been put into production and provided with adjusting bricks, the adjusting bricks should be closely arranged at two sides of the nose bridge brick. The method can effectively reduce the size of a high-temperature region at the bottom of the vertical flue, decreases highest combustion temperature and generation of nitrogen oxide in the vertical flue, and reduces nitrogen oxide in the chimney of the coke oven from the source.
Description
Technical field
The present invention relates to coking technology field, particularly relate to a kind of method of effective reduction coke oven NO_x formation.
Background technology
During coke oven heating, inflammable gas is high-temp combustion in flue, can produce oxynitride.Oxynitride, as pollutant effulent, not only can cause the environmental problems such as the destruction of acid rain, photo-chemical smog, Greenhouse effect and ozonosphere, can cause high risks simultaneously to HUMAN HEALTH.Research shows, coke oven vertical flame path combustion temperature is higher, and the oxynitride of generation is more.Therefore, in Heating Process in Coke Oven, strictly must control the discharge of oxynitride.
The method of the reduction coke oven discharged nitrous oxides extensively adopted at present can be divided into source to reduce discharging and the large class of end treatment two.The method that the existing coke oven of China generally adopts oxynitride source to reduce discharging, for controlling the temperature of combustion in flue, have employed mode such as height lamp holder, waste gas circulation and inflammable gas and air segmenting supply etc.As Figure 1-Figure 2, bottom flue, inflammable gas enters flue 8 from bottom low-grade gas entrance 1 or rich gas entrance 2, and air enters flue 8 from bottom air inlet 3, and after entering flue 8, inflammable gas and air generation blending are burnt.Adopt in the coke oven of low-grade gas heating, be separated by by bridge of the nose brick 4 between low-grade gas entrance 1 and gas inlet 3, the two distance is usually at 40mm ~ 50mm, and bridge of the nose brick 4 is lower than bottom flue; And in the coke oven adopting rich gas to heat, the distance between rich gas entrance 2 and gas inlet 3 is less than 150mm usually.Blending is there is rapidly and burns in this structure after making inflammable gas and air one enter flue 8, cannot fully mix with the cycle gas entered from exhaust gas circulation hole 5 before combustion, combustiblematerials and oxygen is made to participate in burning with higher concentration, burning is violent, temperature of combustion is high, and larger high-temperature zone is defined bottom flue 8, in this region, very easily generate a large amount of oxynitride, make coke oven nitrogen oxide emission be in higher level.
As Figure 3-Figure 4, it is a kind of coke oven vertical flame path bottom construction with adjusting brick, in order to control to enter the gas flow bottom flue 8, placed quantity adjustable adjusting brick 7 near coking chamber partition wall 6 away from bridge of the nose brick 4 side at bottom low-grade gas entrance 1 and gas inlet 3, but the decoration form of this adjusting brick is unfavorable for the generation reducing oxynitride.
Summary of the invention
The invention provides a kind of method of effective reduction coke oven NO_x formation, by moving on the blending of inflammable gas in flue and air point, the blending burning of both postponements; The size of high-temperature zone bottom flue can be effectively reduced, reduce maximum combustion temperature, reduce the generation of oxynitride in flue, reduce the discharge of coke oven chimney oxynitride from source.
In order to achieve the above object, the present invention realizes by the following technical solutions:
A method for effective reduction coke oven NO_x formation, by moving on the blending of inflammable gas in flue and air point, the blending burning of both postponements; Specifically comprise:
1) for the coke oven adopting low-grade gas heating, make the distance bottom flue between inflammable gas entrance and gas inlet be not less than 70mm, or the distance that bridge of the nose brick is exceeded bottom flue is not less than 80mm;
2) for the coke oven adopting rich gas heating, the distance bottom flue between inflammable gas entrance and gas inlet is made to be not less than 170mm;
3) for the coke oven being provided with adjusting brick of having gone into operation, adjusting brick is close to bridge of the nose brick both sides and is placed.
Compared with prior art, the invention has the beneficial effects as follows:
1) postponed the blending burning of flue bottom airflow, made the first and cycle gas blending bottom flue of inflammable gas and air, then burn, reduce inflammable gas and oxygen concentration, weaken intensity of combustion, reduce maximum combustion temperature;
2) experiment results shows, invention increases the distance bottom the blending point of flue bottom inflammable gas and air and flue, burning position is raised, improves flue high to heating uniformity;
3) reduce the growing amount of oxynitride in flue combustion process, and then reduce coke oven discharged nitrous oxides, reduce the pollution to environment; Experiment results shows, when the distance between low-grade gas entrance and gas inlet is increased to 150mm from 40mm, in flue, formation of nitrogen oxides reduces more than 30%;
4) for the coke oven of having gone into operation, directly by the placement location of adjusting brick bottom adjustment flue, can realize from being placed on bridge of the nose brick side away from bridge of the nose brick side by adjusting brick, easy handling, and successful.
Accompanying drawing explanation
Fig. 1 is traditional coke oven flue bottom construction schematic diagram.
Fig. 2 is the A-A sectional view of Fig. 1.
Fig. 3 has gone into operation to be with the coke oven vertical flame path bottom construction schematic diagram of adjusting brick.
Fig. 4 is the B-B sectional view of Fig. 3.
Fig. 5 is the flue bottom construction schematic diagram one of employing low-grade gas of the present invention heating coke oven.
Fig. 6 is the flue bottom construction schematic diagram two of employing low-grade gas of the present invention heating coke oven.
Fig. 7 is the C-C sectional view of Fig. 6.
Fig. 8 is the flue bottom construction schematic diagram of employing rich gas of the present invention heating coke oven.
Fig. 9 is the flue bottom construction schematic diagram of band adjusting brick coke oven of having gone into operation of the present invention.
Figure 10 is the D-D sectional view of Fig. 9.
Figure 11 adopts the flue before and after the present invention high to results of combustion tests comparison diagram.
In figure: 1. low-grade gas entrance 2. rich gas entrance 3. gas inlet 4. bridge of the nose brick 5. exhaust gas circulation hole 6. coking chamber partition wall 7. adjusting brick 8. flue
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
The method of a kind of effective reduction coke oven NO_x formation of the present invention, by moving on the blending of inflammable gas in flue and air point, the blending burning of both postponements; Specifically comprise:
1) for the coke oven adopting low-grade gas heating, make the distance bottom flue between inflammable gas entrance and gas inlet be not less than 70mm, or the distance that bridge of the nose brick is exceeded bottom flue is not less than 80mm;
2) for the coke oven adopting rich gas heating, the distance bottom flue between inflammable gas entrance and gas inlet is made to be not less than 170mm;
3) for the coke oven being provided with adjusting brick of having gone into operation, adjusting brick is close to bridge of the nose brick both sides and is placed.
In conventional coke oven, coking chamber setting alternate with combustion chamber, coking chamber wall surface-area is comparatively large, in order to obtain ripe evenly, containing the more consistent coke of volatile matter, require combustion chamber flue high to meet the demands for heat energy along its length, i.e. the upper and lower homogeneous temperature of flue.If charge of coke is high irregular to heating along coke oven, can make that coke size homogeneity and wear resistance reduce, thermal losses increases, coking technique difficulty, and to fall behind portion retracts bad and increase coke pushing power etc. because charge of coke heating.
Affect coke oven high to heating factor mainly contain the speed of gas-fired, the speed of air-flow and furnace wall heat transfer, coaling along high to bulk density etc., the speed of wherein gas-fired plays a major role.Enter the very high combustion chamber of temperature after usual coal gas and the first preheating of air, fuel mixture is heated to kindling temperature and burns, and chemical reaction completes instantaneously.The combustionvelocity of coal gas in flue depends on the physical process that combustiblematerials molecule and air molecule contact with each other, i.e. diffusion process.During diffusion combustion, there is carbon compound pyrolysis due to the deficiency of local oxygen, produce uncombined carbon, make in zone of combustion, to produce strong light and heat radiation because of the existence of solia particle, form luminous flame.The length of flame is relevant with the speed of gas-fired, and gas-fired speed is slower, and flame is longer.For elongating flame, improve the high homogeneity to heating, coke oven vertical flame path planted agent makes coal gas slowly contact mixing with air.
The time that heating gas (inflammable gas) and air (combustion-supporting gas) combustion processes in flue consume participates in each composition burnt to be heated to burning-point, and combustiblecomponents and oxygen are joined and completed the summation of combustion reactions required time.Under the condition that flue temperature is very high, coal gas and air, before entering flue, are namely heated to flare point in regenerator.To completing the full time consumed in combustion processes from flare point, it is in fact exactly coal gas and that for some time needed for air mixed.
Accompanying drawing 5 is a kind of flue bottom construction schematic diagram that the present invention is applied to when adopting low-grade gas heating coke oven.Distance bottom flue between low-grade gas entrance 1 and gas inlet 3 is not less than 70mm, namely the distance bottom the blending point of flue bottom inflammable gas and air and flue is added, make the low-grade gas and the air that enter bottom flue and first blending occur from the cycle gas that exhaust gas circulation hole 5 enters, burn again, effectively reduce the concentration of reaction zone combustiblecomponents and oxygen, weaken response intensity, reduce maximum combustion temperature, decrease the generation of oxynitride in flue 8.
Experiment results shows, the distance between low-grade gas entrance 1 and gas inlet 3 is increased to 150mm from 40mm, and in flue 8, formation of nitrogen oxides reduces more than 30%.Due to the increase of the low-grade gas that sprays bottom flue and air draught spacing, make to enter low-grade gas bottom flue and air to meet in uphill process and postpone, thus postponed the blending burning of the two, combustion high temperature zone position is moved to flue 8 top, improve flue 8 height to heating uniformity, experimental result as shown in figure 11.
As Figure 6-Figure 7, be the another kind of flue bottom construction schematic diagram that the present invention is applied to when adopting low-grade gas heating coke oven.The distance that bridge of the nose brick 4 bottom flue between low-grade gas entrance 1 and gas inlet 3 exceeds bottom flue is not less than 80mm, namely the distance bottom the blending point of flue bottom inflammable gas and air and flue is increased, make the low-grade gas and the air that enter bottom flue and first blending occur from the cycle gas that exhaust gas circulation hole 5 enters, burn again, effectively reduce the concentration of reaction zone combustiblecomponents and oxygen, weaken response intensity, reduce maximum combustion temperature, decrease the generation of oxynitride in flue 8.
As shown in Figure 8, be that the present invention is applied to a kind of flue bottom construction schematic diagram when adopting rich gas heating coke oven.Distance bottom flue between rich gas entrance 2 and gas inlet 3 is not less than 170mm, namely the distance bottom the blending point of flue bottom inflammable gas and air and flue is increased, make the rich gas and the air that enter bottom flue and first blending occur from the cycle gas that exhaust gas circulation hole 5 enters, burn again, effectively reduce the concentration of reaction zone combustiblecomponents and oxygen, weaken response intensity, reduce maximum combustion temperature, decrease the generation of oxynitride in flue 8.
Inflammable gas and air draught are when entering bottom flue at a distance of far away, and the effect reducing NO_x formation is more obvious.In the present invention, be positioned at the inflammable gas passage before inflammable gas entrance or gas inlet or air passageways is vertical or opposing is obliquely installed, inflammable gas entrance and gas inlet can be arbitrary shapes.
For the coke oven of band adjusting brick of going into operation, as shown in Fig. 9-Figure 10, by directly adjusting the placement location of adjusting brick 7 bottom flue, place from adjusting to bridge of the nose brick 4 side away from bridge of the nose brick 4 side by adjusting brick 7, also the distance bottom flue between inflammable gas entrance and gas inlet can be added, the blending burning of both postponements, reduces maximum combustion temperature, reduces the generation of oxynitride in flue 8.
In Fig. 1, Fig. 3, Fig. 8 and Fig. 9, when label 1/3 represents that coke oven adopts low-grade gas to heat, this position is low-grade gas entrance, and when coke oven adopts rich gas to heat, this position is gas inlet.
The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (1)
1. effectively reduce a method for coke oven NO_x formation, it is characterized in that, by moving on the blending of inflammable gas in flue and air point, the blending burning of both postponements; Specifically comprise:
1) for the coke oven adopting low-grade gas heating, make the distance bottom flue between inflammable gas entrance and gas inlet be not less than 70mm, or the distance that bridge of the nose brick is exceeded bottom flue is not less than 80mm;
2) for the coke oven adopting rich gas heating, the distance bottom flue between inflammable gas entrance and gas inlet is made to be not less than 170mm;
3) for the coke oven being provided with adjusting brick of having gone into operation, adjusting brick is close to bridge of the nose brick both sides and is placed.
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| CN201510874341.6A CN105385462A (en) | 2015-12-02 | 2015-12-02 | Method capable of effectively reducing nitrogen oxide in coke oven |
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| CN201510874341.6A CN105385462A (en) | 2015-12-02 | 2015-12-02 | Method capable of effectively reducing nitrogen oxide in coke oven |
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| CN105385462A true CN105385462A (en) | 2016-03-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111479902A (en) * | 2017-09-15 | 2020-07-31 | 蒂森克虏伯工业解决方案股份公司 | Coke oven plant with central recirculation for producing coke, method for operating a coke oven plant, and control device and use |
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| JP2001003055A (en) * | 1999-06-17 | 2001-01-09 | Sumitomo Metal Ind Ltd | Method for reducing nitrogen oxide in duplex coke oven combustion exhaust gas |
| CN102297723A (en) * | 2011-05-20 | 2011-12-28 | 袁国炳 | Online optical temperature measuring equipment suitable for high temperature environment and network measurement method |
| CN103897711A (en) * | 2014-04-16 | 2014-07-02 | 青岛伊诺威能源化工新技术有限公司 | Heat exchange device for transversely continuous heating of vertical coke discharging type coke oven |
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2015
- 2015-12-02 CN CN201510874341.6A patent/CN105385462A/en active Pending
Patent Citations (3)
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| JP2001003055A (en) * | 1999-06-17 | 2001-01-09 | Sumitomo Metal Ind Ltd | Method for reducing nitrogen oxide in duplex coke oven combustion exhaust gas |
| CN102297723A (en) * | 2011-05-20 | 2011-12-28 | 袁国炳 | Online optical temperature measuring equipment suitable for high temperature environment and network measurement method |
| CN103897711A (en) * | 2014-04-16 | 2014-07-02 | 青岛伊诺威能源化工新技术有限公司 | Heat exchange device for transversely continuous heating of vertical coke discharging type coke oven |
Non-Patent Citations (4)
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| 于振东等: "《焦炉生产技术》", 30 April 2004, 辽宁科学技术出版社 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111479902A (en) * | 2017-09-15 | 2020-07-31 | 蒂森克虏伯工业解决方案股份公司 | Coke oven plant with central recirculation for producing coke, method for operating a coke oven plant, and control device and use |
| CN111492038A (en) * | 2017-09-15 | 2020-08-04 | 蒂森克虏伯工业解决方案股份公司 | Coke oven plant with eccentric inlet for producing coke, method for operating coke oven plant, control device and use |
| CN111492038B (en) * | 2017-09-15 | 2022-02-22 | 蒂森克虏伯工业解决方案股份公司 | Coke oven plant with eccentric inlet for producing coke, method for operating coke oven plant, control device and use |
| CN111479902B (en) * | 2017-09-15 | 2022-03-04 | 蒂森克虏伯工业解决方案股份公司 | Coke oven plant, method for operating coke oven plant, control device and use |
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