CN102517042A - Method for heating coke oven capable of controlling multistage combustion - Google Patents

Method for heating coke oven capable of controlling multistage combustion Download PDF

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Publication number
CN102517042A
CN102517042A CN2011101682288A CN201110168228A CN102517042A CN 102517042 A CN102517042 A CN 102517042A CN 2011101682288 A CN2011101682288 A CN 2011101682288A CN 201110168228 A CN201110168228 A CN 201110168228A CN 102517042 A CN102517042 A CN 102517042A
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flue
gas
air
regenerator
blast furnace
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CN102517042B (en
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张长青
杨俊峰
马小波
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Acre Coking and Refractory Engineering Consulting Corp MCC
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Acre Coking and Refractory Engineering Consulting Corp MCC
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Abstract

The invention relates to the metallurgy coking field, and relates to a method for heating a coke oven capable of controlling multistage combustion, which is characterized in that blast furnace gas and air are supplied by stages to a combustion chamber vertical flue, exhaust gas generated by combustion is raised to the top of the flue, turned through a spanning hole and enters into a descending gas flow vertical flue, passed through a descending gas flow inclined path at the bottom of the flue and then enters to an adjacent regenerator, is subjected to heat exchange with a checker brick in the regenerator, the cooled exhaust gas is introduced to a small flue through an adjustable grate aperture, finally passed through a general flue to a chimney for discharging. An exhaust gas circular aperture is provided at the root of a partition wall between two vertical flues of a twin-flue, exhaust gas in the descending gas flow vertical flue can be sucked to the rising gas flow vertical flue, and mixed with the raised combustion air-flow to achieve the purposes of diluting the combustion gas mixture, reducing the violent degree of combustion, elongating the flame, raising high position heating uniformity of a carbonization chamber. The method of the invention is suitable for large-scale development of the coke oven, the high position heating uniformity of the coke oven can be effectively enhanced, and the heat loss can be minimized, and the method of the invention is in favor of environmental protection.

Description

A kind of may command multistage incendiary coke oven heating means
Technical field
The present invention relates to metallurgical coking field, particularly pressures inside multistage method for controlling combustion.
Background technology
Along with the development of coking technology, national policy is also increasingly high to the environmental requirement of coking industry, especially to the disposal of pollutants of coking paroxysmal, NO XEmission limit set is more and more stricter.Therefore, the coke oven design just towards maximizing and the development of multiple spot burning control structure combining, to reduce the coke pushing number of times, reduces NO XBe generated as target, thereby reach environmental requirement.
Summary of the invention
The purpose of this invention is to provide a kind of re-heat down-regulation type, blast furnace gas and air respectively segmentation infeed flue burning; Coke-oven gas is the coke oven heating means of spray down; This method is fit to the coke oven large scale development, can effectively improve the coke oven height to heating uniformity, minimizing thermosteresis, helps environmental protection.
For realizing above-mentioned purpose, the present invention realizes through following technical scheme:
A kind of may command multistage incendiary coke oven heating means comprise combustion chamber, coking chamber, regenerator.The combustion chamber is made up of some flues, and each forms a twinflue to flue, between twinflue two flues, is provided with partition wall, and its top is communicated with through crossing over the hole; It is characterized in that; Blast furnace gas, air segmenting infeed the combustion chamber flue, and the waste gas that burning produces rises to the flue top, turn to entering downdraft flue through crossing over the hole; Downdraft through the flue bottom gets into adjacent regenerator through chute; In regenerator, carry out heat exchange with checker brick, the waste gas after the cooling gets into bottom flue through adjustable grate hole, at last through dividing flue, main flue to smoke stack emission.
Be provided with the multistage blast furnace gas in the flue partition of described combustion chamber and air infeeds mouth; Blast furnace gas, air infeed mouth for first section and are positioned at the flue bottom; Multistage blast furnace gas and air infeed mouthful along the combustion chamber flue partition height to being distributed in different positions, topmost are provided with and slidably regulate brick in exit at it.
A kind of may command multistage incendiary coke oven heating means comprise combustion chamber, coking chamber, regenerator.The combustion chamber is made up of some flues, and each forms a twinflue to flue, between twinflue two flues, is provided with partition wall, and its top is communicated with through crossing over the hole; It is characterized in that when using coke-oven gas burning heating, spray was infeeded by the flue bottom under coke-oven gas adopted; Air segmenting infeeds the combustion chamber flue, and the waste gas that burning produces rises to the flue top, turns to entering downdraft flue through crossing over the hole; Downdraft chute through the flue bottom gets into adjacent regenerator; In regenerator, carry out heat exchange with checker brick, brick gets into bottom flue to the waste gas after the cooling through adjustable grate hole, discharges through main flue to chimney at last.
When using blast furnace gas burning heating; Blast furnace gas and air segmenting infeed combustion chamber flue burning, and the waste gas that burning produces rises to the flue top, turn to through the leap hole to get into the downdraft flue; Downdraft chute through the flue bottom gets into adjacent regenerator; In regenerator, carry out heat exchange with checker brick, the waste gas after the cooling gets into bottom flue through adjustable grate hole, discharge through main flue to chimney at last.
The root of described twinflue two flue partitions is provided with exhaust gas circulation hole; Through exhaust gas circulation hole with the Abgasabsaugung in the downdraft flue to the air-flow flue that rises; Mix with the combustion gas flowing that rises, reach the dilute combustion gas mixture, reduce the burning severe, elongate flame, improve the purpose of coking chamber height to heating uniformity.
The amount of infeeding of described blast furnace gas, air changes the feed rate of air-flow through the airflow sectional area that changes the adjustable grate brick between regenerator bottom and the bottom flue top, adopts in grate brick hole plus-minus to regulate brick and realizes adjusting.
This method is applicable to that the coking chamber height is the coke oven of 5-10 rice, can adopt blast furnace gas, two kinds of fuel heat supplies of coke-oven gas.
Compared with prior art, the invention has the beneficial effects as follows:
1) uses this method can effectively improve the coke oven height, realize that coke oven is to large scale development to heating uniformity; Use the coke furnace carbonization chamber height of this method can reach more than the 7m to size; Along with coke oven maximizes, the coking chamber single hole is volume gain.Produce same output coke, the coke pushing number of times reduces, and the paroxysmal exhaust emission reduces, and effectively promotes the operation efficiency of coke over machinery;
When 2) using the blast furnace gas heat supply, air and blast furnace gas segmentation infeed flue, the equal adjustable of the air gas amount of infeeding; This method combines with waste gas circulation, can effectively improve the coke oven height to heating uniformity, minimizing thermosteresis, has improved the thermo-efficiency of coke oven;
When 3) adopting the coke-oven gas heat supply, coke-oven gas spray down, air segmenting infeed flue, burn with coke-oven gas, combine exhaust gas recirculation again, can effectively improve the coke oven height to heating uniformity, reduce thermosteresis, have improved the thermo-efficiency of coke oven;
When 4) adopting the blast furnace gas heat supply, the row burning combined exhaust gas recirculation again when blast furnace gas, air segmenting infeeded in the flue, can effectively improve the coke oven height to heating uniformity, reduced thermosteresis, had improved the thermo-efficiency of coke oven;
5) sectional combustion and exhaust gas recirculation help the control burning, reduce coke-oven gas incendiary severe, reduce high temperature dot, thereby reduce NO XGeneration, be more conducive to environmental protection.
Description of drawings
Fig. 1 is a coking furnace shaft sectional view of the present invention;
Fig. 2 is a coking furnace shaft burning sectional view of the present invention.
Among the figure: 1-combustion chamber 2-coking chamber 3-upstream flue 4-downdraft flue 5-downdraft chute 6-upstream chute 7-upstream chute 8-regenerator (this exchange, waste gas) 9-bottom flue (waste gas, this exchange) 10-coal gas bottom flue 11-air bottom flue 12-gas regenerator 13-air regenerator 14-coke-oven gas passage 15-blast furnace gas, air the-section infeeds mouthful (chute outlet) 16-twinflue partition wall 17-second section blast furnace gas, air and infeeds mouthful 18-the 3rd section blast furnace gas, air and infeed a mouthful 19-twinflue leap hole 20-exhaust gas circulation hole
Embodiment
Describe furnace binding of the present invention and heating means in detail below in conjunction with accompanying drawing.
See Fig. 1, coke oven construction comprises combustion chamber 1, coking chamber 2, chute, regenerator, and chute comprises upstream chute 6, upstream chute 7, downdraft chute 5 (this exchange shown in Figure 1); Regenerator comprises gas regenerator 12, air regenerator 13, waste gas regenerator 8 (this exchange shown in Figure 1).Coking coal is by the coke oven furnace roof hole coking chamber 2 of packing into of coalingging, and by providing heat that the shove charge coal is smelt coke with coking chamber 2 combustion chamber alternately, the raw gas of generation gets into gas recovery system by the rising pore at furnace roof position.
See Fig. 2, coke oven combustion chamber comprises that combustion chamber twinflue, air and coal gas (blast furnace gas, coke-oven gas) infeed mouth, twinflue is crossed over hole 19, flue bottom exhaust gas circulation hole 20.Twinflue is made up of upstream flue 3 and downdraft flue 4, through leap hole 19 connections at flue top.
Air and coal gas infeed mouth and comprise that first section of blast furnace gas, air infeeds mouthfuls of 15, second sections blast furnace gas, air and infeed mouthfuls of 17 and the 3rd sections blast furnace gas, air and infeed mouthfuls 18; Blast furnace gas, air infeed mouthful 15 (being the chute outlet) for first section and are positioned at the flue bottom, and three sections air infeed mouth and are positioned at the combustion chamber flue and are positioned at different height.Blast furnace gas, air passageways 16 are positioned at the partition wall of flue.When adopting coke-oven gas to be fuel, air is the mode that multistage infeeds flue, and the air multistage infeeds structure with the blast furnace gas burning structures, and coke-oven gas sprays into the flue bottom by coke-oven gas nozzle 21.
The root of twinflue midfeather is provided with exhaust gas circulation hole 20; Through exhaust gas circulation hole 20 two flue bottoms are linked to each other; With the Abgasabsaugung in the downdraft flue 4 to the air-flow flue 3 that rises; Mix with the combustion gas flowing that rises, reach the dilute combustion gas mixture, reduce the burning severe, elongate flame, improve the purpose of coking chamber height to heating uniformity.
The bottom, combustion chamber is a chute, and the chute bottom is a regenerator.There is the gas channel that staggers each other to be connected with air regenerator and gas regenerator respectively in the chute; Like Fig. 1, shown in Figure 2; Gas passage 16 in the twinflue partition wall of combustion chamber is respectively blast furnace gas and air passageways; Blast furnace gas and air passageways communicate with gas regenerator 12 and air regenerator 13 through chute 7 and chute 6 respectively, and waste gas after burning gets into regenerator 8 through downdraft chute 5.Regenerator is divided into 17 little regenerator of lattice by the little partition wall in 16 roads, and the porous checker brick are arranged in the little regenerator, and the adjustable grate hole that can regulate the area size is arranged at little regenerator bottom; Realize the adjusting of gas through regulating brick to grate hole plus-minus through sectional area at vault.In little regenerator bottom is bottom flue, and the outer end of bottom flue is connected with dividing flue, discharges through main flue to chimney at last.
Present embodiment coke oven mode of operation is divided into two kinds of heat supply OFF state, corresponding two kinds of fuel heat supplies, and concrete the narration as follows:
1. use blast furnace gas to act as a fuel and the air mixed burning is heated coke oven
1) air gets into corresponding separately air regenerator 13 and gas regenerator 12 via air regenerator 13 and gas regenerator 12 following air bottom flue 11, coal gas bottom flues 10 after distributing tolerance through adjustable grate hole respectively with blast furnace gas;
2) the interior checker brick of air, blast furnace gas and regenerator that get into air regenerator 13 and gas regenerator 12 carry out heat exchange, rise to the regenerator top to be warming up to~1100 ℃;
3) arrive heating gas and each self-corresponding chute of warm air entering regenerator top that regenerator is pushed up, preheated air gets into chute 6, and the blast furnace gas of preheating gets into chute 7; Be divided into two-way through chute then and get into the gas channel 16 in chute outlet 15 of flue bottom, combustion chamber and the combustion chamber flue partition respectively;
4) hot blast furnace gas and the warm air that gets into the combustion chamber is divided into three parts and infeeds flue and burn; It mouthful is that chute outlet 15, second sections blast furnace gases, air infeed mouthfuls of 17, the 3rd sections blast furnace gas, air and infeed mouthfuls 18 at the bottom of the flue that first section of blast furnace gas, air infeed; Three sections blast furnace gases, gas inlets are positioned at different height, and the mode that this kind gas multistage infeeds is particularly suitable for the maximization design of coke oven, can make coal gas height make progress combustion distribution more evenly, more abundant;
5) waste gas of burning generation rises to the leap hole 19 on flue top; Turn to then and get into downdraft flue 4; Downdraft chute 5 outlets at the bottom of flue get into adjacent regenerator 8; In regenerator 8, carry out heat exchange with checker brick, be cooled to after the heat exchange~270 ℃ waste gas gets into bottom flue, waste gas lobe and flue bent pipe through dividing flue through adjustable grate hole again, discharges through main flue to chimney at last;
6) waste gas circulation: the root at a twinflue midfeather has exhaust gas circulation hole 20; The jet power of upstream and heat buoyancy can produce negative pressure herein, and the Abgasabsaugung in the downdraft is come, and it is mixed with the combustion gas flowing that rises; Reach the dilute combustion gas mixture; Reduce the burning severe, the target of elongating flame finally reaches the purpose of coking chamber height to heating uniformity;
7) sectional combustion gas flow modulation: be provided with at the top exit of segmentation air feed and slidably regulate brick, regulate brick and can change the pneumatic outlet sectional area through stirring, thereby change segmentation air feed height to the distribution of air flow ratio, with reach regulate high to the heating uniformity purpose;
So far, use the blast furnace gas combustion processes that heats with air combustion that acts as a fuel promptly to accuse completion.
2. use coke-oven gas to act as a fuel and the air mixed burning is heated coke oven
1) air distributes the back to get into corresponding regenerator via air regenerator 13 and gas regenerator 12 following coal gas bottom flue 10, air bottom flues 11 through adjustable grate hole;
2) get into the air of air regenerator 13 and gas regenerator 12 and the checker brick in the regenerator and carry out heat exchange, rise to the regenerator top then;
3) arrive in the warm air entering regenerator top chute 6 and chute 7 at regenerator top, get into the gas channel 16 in flue bottom, combustion chamber and the combustion chamber flue partition then;
4) coke-oven gas gas pipe brick, the gas pipe brick the chute district in and the 21 back entering flues 3 of the coke-oven gas nozzle at the bottom of the flue in the process line gasburner, regenerator main wall of vault of flowing through;
5) warm air that gets into the combustion chamber is divided into three parts, and (it mouthful is that 15, second sections air of chute outlet infeed mouthfuls of 17, the 3rd sections air and infeed mouthfuls 18 at the bottom of the flue that first section of air infeeds; ) carry out mixed firing with the coke-oven gas that ejects through coke-oven gas nozzle 21;
6) high-temp waste gas of burning generation rises to the leap hole 19 on flue top; Turn to then and get into downdraft flue 4; Downdraft chute 5 outlets at the bottom of flue get into regenerator 8; In regenerator 8, carry out heat exchange with checker brick, be cooled to after the heat exchange~300 ℃ of waste gas get into bottom flue, waste gas lobe and flue bent pipe through adjustable grate hole again to be passed through to divide flue, discharge through main flue to chimney at last;
7) waste gas circulation: the root of a twinflue midfeather has exhaust gas circulation hole 20; The jet power of upstream and heat buoyancy can produce negative pressure herein, and the Abgasabsaugung in the downdraft is come, and it is mixed with the combustion gas flowing that rises; Reach the dilute combustion gas mixture; Reduce the burning severe, the target of elongating flame finally reaches the purpose of coking chamber height to heating uniformity.
8) sectional combustion gas flow modulation: be provided with at the top exit of segmentation air feed and slidably regulate brick, regulate brick and can change the pneumatic outlet basal area through stirring, thereby change segmentation air feed height to the air partition rate, with reach regulate high to the heating uniformity purpose;
It is 5~10 meters the coke oven higher to environmental requirement that two kinds of fuel type of heating of the coke oven of this embodiment and structure all are used for the coking chamber height.

Claims (7)

1. may command multistage incendiary coke oven heating means; Comprise combustion chamber, coking chamber, regenerator, the combustion chamber is made up of some flues, and each forms a twinflue to flue; Between twinflue two flues, be provided with partition wall, its top is communicated with through crossing over the hole; It is characterized in that; Blast furnace gas, air segmenting infeed the combustion chamber flue, and the waste gas that burning produces rises to the flue top, turn to entering downdraft flue through crossing over the hole; Downdraft through the flue bottom gets into adjacent regenerator through chute; In regenerator, carry out heat exchange with checker brick, the waste gas after the cooling gets into bottom flue through adjustable grate hole, at last through dividing flue, main flue to smoke stack emission.
2. a kind of may command multistage incendiary coke oven heating means according to claim 1; It is characterized in that; The blast furnace gas and the air that are provided with the multistage air feed in the flue partition of described combustion chamber infeed mouth; Blast furnace gas, air infeed mouth for first section and are positioned at the flue bottom, and multistage blast furnace gas and air infeed mouthful along the combustion chamber flue partition height to being distributed in different positions, topmost are provided with and slidably regulate brick in exit at it.
3. may command multistage incendiary coke oven heating means comprise combustion chamber, coking chamber, regenerator.The combustion chamber is made up of some flues, and each forms a twinflue to flue, between twinflue two flues, is provided with partition wall, and its top is communicated with through crossing over the hole; It is characterized in that when using coke-oven gas burning heating, spray was infeeded by the flue bottom under coke-oven gas adopted; Air segmenting infeeds the combustion chamber flue, and the waste gas that burning produces rises to the flue top, turns to entering downdraft flue through crossing over the hole; Downdraft chute through the flue bottom gets into adjacent regenerator; In regenerator, carry out heat exchange with checker brick, brick gets into bottom flue to the waste gas after the cooling through adjustable grate hole, discharges through main flue to chimney at last.
When using blast furnace gas burning heating; Blast furnace gas and air segmenting infeed combustion chamber flue burning, and the waste gas that burning produces rises to the flue top, turn to through the leap hole to get into the downdraft flue; Downdraft chute through the flue bottom gets into adjacent regenerator; In regenerator, carry out heat exchange with checker brick, the waste gas after the cooling gets into bottom flue through adjustable grate hole, discharge through main flue to chimney at last.
4. a kind of may command multistage incendiary coke oven heating means according to claim 3; It is characterized in that; Be provided with the multistage blast furnace gas in the flue partition of described combustion chamber and air infeeds mouth, air-flow infeeds mouth for first section and is positioned at the flue bottom, and the multistage air-flow infeeds mouthful along the flue height to being distributed in different heights; Topmost be provided with and slidably regulate brick in exit at it, thereby change the airdelivery rate that epimere air stream outlet sectional area changes each segmentation outlet through the slide control brick.
5. according to each described a kind of may command multistage incendiary coke oven heating means in the claim 1 to 4; It is characterized in that; The root of described twinflue two flue partitions is provided with exhaust gas circulation hole; Through exhaust gas circulation hole with the Abgasabsaugung in the downdraft flue to the air-flow flue that rises, mixes with the combustion gas flowing that rises, reach the dilute combustion gas mixture, reduce the burning severe, elongate flame, raising coking chamber height is to the purpose of heating uniformity.
6. according to each described a kind of may command multistage incendiary coke oven heating means in the claim 1 to 4; It is characterized in that; The amount of infeeding of described blast furnace gas, air changes the feed rate of air-flow through the airflow sectional area that changes the adjustable grate brick between regenerator bottom and the bottom flue top, adopts in grate brick hole plus-minus to regulate brick and realizes adjusting.
7. according to each described a kind of may command multistage incendiary coke oven heating means in the claim 1 to 4, it is characterized in that this method is applicable to that the coking chamber height is the coke oven of 5-10 rice, can adopt blast furnace gas, two kinds of fuel heat supplies of coke-oven gas.
CN201110168228.8A 2011-06-21 2011-06-21 Method for heating coke oven capable of controlling multistage combustion Active CN102517042B (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102796534A (en) * 2012-08-06 2012-11-28 山西鑫立能源科技有限公司 Heat storage and heat exchange method for coal pyrolysis furnace combustion heater
CN102925164A (en) * 2012-11-13 2013-02-13 中冶焦耐工程技术有限公司 Coke oven heating method
WO2014023206A1 (en) * 2012-08-06 2014-02-13 山西鑫立能源科技有限公司 Gas reversing device for gas heater of coal pyrolyzing furnace
WO2014023204A1 (en) * 2012-08-06 2014-02-13 山西鑫立能源科技有限公司 External gas heating device of coal pyrolyzing furnace
CN106318409A (en) * 2016-08-23 2017-01-11 迁安市九江煤炭储运有限公司 Process for replacing coke oven gas by gasifying furnace gas
CN106635068A (en) * 2017-02-10 2017-05-10 北京华泰焦化工程技术有限公司 Coke oven and heating method thereof
CN111436202A (en) * 2017-09-15 2020-07-21 蒂森克虏伯工业解决方案股份公司 Coke oven plant for producing coke, having a circulating flow path that is circulated, and method for operating the coke oven plant, as well as control device and use
CN112538360A (en) * 2020-12-21 2021-03-23 中冶焦耐(大连)工程技术有限公司 Combined adjustable rich gas heating coke oven
WO2021128951A1 (en) * 2019-12-27 2021-07-01 中冶焦耐(大连)工程技术有限公司 Novel coke oven structure and sectional heating combustion method thereof
CN113785033A (en) * 2019-05-08 2021-12-10 蒂森克虏伯工业解决方案股份公司 Coke oven plant for producing coke, method for operating a coke oven plant and use
RU2811610C1 (en) * 2019-12-27 2024-01-15 Эйкр Кокинг & Рефрэктори Инджиниринг Консалтинг Корпорейшн (Далянь), Мкк New design of coke oven and method of its combustion with sectional heating

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CN85103685A (en) * 1985-05-14 1986-07-09 武汉钢铁公司技术部 Di-hairpin (quaternary) circulation flues of coke ovens
CN1036786A (en) * 1988-04-15 1989-11-01 克鲁普科普斯有限公司 Reduce NO in the flue gas during pit kiln heating xThe pit kiln of the method for content and enforcement this method
CN1133337A (en) * 1995-11-28 1996-10-16 程相魁 Heat-exchanging top-jetting no-recovering chamber type coke furnace

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CN85103685A (en) * 1985-05-14 1986-07-09 武汉钢铁公司技术部 Di-hairpin (quaternary) circulation flues of coke ovens
CN1036786A (en) * 1988-04-15 1989-11-01 克鲁普科普斯有限公司 Reduce NO in the flue gas during pit kiln heating xThe pit kiln of the method for content and enforcement this method
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102796534A (en) * 2012-08-06 2012-11-28 山西鑫立能源科技有限公司 Heat storage and heat exchange method for coal pyrolysis furnace combustion heater
WO2014023206A1 (en) * 2012-08-06 2014-02-13 山西鑫立能源科技有限公司 Gas reversing device for gas heater of coal pyrolyzing furnace
WO2014023204A1 (en) * 2012-08-06 2014-02-13 山西鑫立能源科技有限公司 External gas heating device of coal pyrolyzing furnace
CN102925164A (en) * 2012-11-13 2013-02-13 中冶焦耐工程技术有限公司 Coke oven heating method
CN106318409A (en) * 2016-08-23 2017-01-11 迁安市九江煤炭储运有限公司 Process for replacing coke oven gas by gasifying furnace gas
CN106635068A (en) * 2017-02-10 2017-05-10 北京华泰焦化工程技术有限公司 Coke oven and heating method thereof
CN111436202A (en) * 2017-09-15 2020-07-21 蒂森克虏伯工业解决方案股份公司 Coke oven plant for producing coke, having a circulating flow path that is circulated, and method for operating the coke oven plant, as well as control device and use
CN113785033A (en) * 2019-05-08 2021-12-10 蒂森克虏伯工业解决方案股份公司 Coke oven plant for producing coke, method for operating a coke oven plant and use
WO2021128951A1 (en) * 2019-12-27 2021-07-01 中冶焦耐(大连)工程技术有限公司 Novel coke oven structure and sectional heating combustion method thereof
RU2811610C1 (en) * 2019-12-27 2024-01-15 Эйкр Кокинг & Рефрэктори Инджиниринг Консалтинг Корпорейшн (Далянь), Мкк New design of coke oven and method of its combustion with sectional heating
CN112538360A (en) * 2020-12-21 2021-03-23 中冶焦耐(大连)工程技术有限公司 Combined adjustable rich gas heating coke oven

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