CN111151125A - Comprehensive treatment method for coke oven flue gas - Google Patents

Comprehensive treatment method for coke oven flue gas Download PDF

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Publication number
CN111151125A
CN111151125A CN202010026940.3A CN202010026940A CN111151125A CN 111151125 A CN111151125 A CN 111151125A CN 202010026940 A CN202010026940 A CN 202010026940A CN 111151125 A CN111151125 A CN 111151125A
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CN
China
Prior art keywords
flue gas
coke oven
temperature
flue
ash
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010026940.3A
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Chinese (zh)
Inventor
睢辉
宋学凯
张延春
刘永法
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Shandong Laigang Energy Conservation And Environmental Protection Engineering Co ltd
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Shandong Laigang Energy Conservation And Environmental Protection Engineering Co ltd
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Priority to CN202010026940.3A priority Critical patent/CN111151125A/en
Publication of CN111151125A publication Critical patent/CN111151125A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/8621Removing nitrogen compounds
    • B01D53/8625Nitrogen oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B01D46/023Pockets filters, i.e. multiple bag filters mounted on a common frame
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography

Abstract

The invention discloses a method for comprehensive treatment of coke oven flue gas, wherein flue gas from an underground flue of a coke oven is subjected to dust and tar removal by a bag-type dust remover; cooling the flue gas after the bag-type dust collector through the high-temperature side of the heat exchanger, wherein the temperature of the flue gas after cooling is not higher than 150 ℃; the cooled flue gas enters an active carbon desulfurization device for desulfurization; the temperature of the desulfurized flue gas is raised through the low-temperature side of the heat exchanger; heating the flue gas with the temperature increased to be not lower than 230 ℃ by a flue burner, and then feeding the flue gas into an SCR denitration device; and (4) returning the denitrated flue gas to a coke oven chimney. The invention fully considers the characteristics of the coke oven flue gas and the prior environment-friendly technology, the ash circulating device can effectively collect the smoke dust and tar in the flue gas, the influence of the smoke dust and tar in the flue gas on desulfurization and denitrification is solved, the heat exchanger is adopted to exchange heat with the flue gas before and after desulfurization, the requirement of a desulfurization inlet on the temperature of the flue gas is met, simultaneously the temperature of the flue gas after desulfurization is improved, and the energy consumption for heating the flue gas before denitrification is reduced.

Description

Comprehensive treatment method for coke oven flue gas
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a comprehensive treatment method for coke oven smoke.
Background
The coking industry is a heavy pollution industry, the implementation of environmental protection Law New at 1 st 2015 and emission Standard of pollutants for coking chemical industry (GB16171-2012) further increases the environmental protection management intensity of the coking industry, the local environmental protection standard is more strict, and the comprehensive emission Standard of regional atmospheric pollutants in Shandong province (DB37/2376 and 2019) stipulates that from 11 th 1 st 2020, the smoke particles of the coke oven, SO and the emission Standard of pollutants for the coking chemical industry2And NOxRespectively reaching 10mg/Nm3、30mg/Nm3And 100mg/Nm3The standard of (2) and the requirement for the reference oxygen content are provided, and the SO in the coke oven flue gas is treated2、NOxAnd particulate matter have become key environmental protection items in the coking industry.
Compared with the flue gas of a boiler, the flue gas of a coke oven has the characteristics of low temperature, tar contained in the flue gas, heat backup required for a chimney and the like, so that the flue gas treatment process of a power plant cannot be completely copied.
Disclosure of Invention
Aiming at the characteristics of the coke oven smoke and the defects of the prior art, the invention provides a method for comprehensively treating the coke oven smoke, which can effectively solve the influence of smoke dust and tar in the smoke on desulfurization and denitrification, greatly prolong the service life of a catalyst, reduce the operation cost and ensure that the coke oven smoke is stably discharged up to the standard.
A method for comprehensive treatment of coke oven flue gas comprises the following steps:
1) leading out flue gas from an underground flue of the coke oven and then removing smoke dust and tar in the flue gas by a bag-type dust remover;
2) cooling the flue gas after the bag-type dust collector through the high-temperature side of the heat exchanger, wherein the temperature of the flue gas after cooling is not higher than 150 ℃;
3) the cooled flue gas enters an active carbon desulfurization device for desulfurization;
4) the temperature of the desulfurized flue gas is raised through the low-temperature side of the heat exchanger;
5) heating the flue gas with the temperature increased to be not lower than 230 ℃ by a flue burner, and then feeding the flue gas into an SCR denitration device;
6) and (4) returning the denitrated flue gas to a coke oven chimney through a draught fan, and discharging the flue gas up to the standard.
Preferably, the bag-type dust collector is provided with an ash circulating device, ash in the ash bin is blown into an inlet flue of the bag-type dust collector through an ash conveying fan, the ash is mixed with flue gas and then enters the dust collector, and the ash is collected by the bag-type dust collector after absorbing tar.
Preferably, the air inlet of the ash conveying fan is the raw flue gas of the coke oven, so that the additional introduction of air from the outside is avoided.
Preferably, the heat exchanger is a rotary gas-gas heat exchanger or a heat pipe type heat exchanger.
Preferably, the desulfurization tower of the activated carbon desulfurization device is provided with 6 identical units, 5 is provided with 1, the spare unit is used for activated carbon regeneration, and after the activated carbon is adsorbed and saturated, the activated carbon is regenerated by washing with water or dilute acid to generate dilute sulfuric acid.
Preferably, the SCR denitration device adopts a medium-low temperature SCR catalyst, so that the energy consumption required by heating the flue gas can be reduced.
Preferably, the temperature of the flue gas before the SCR denitration device is raised by a flue combustor.
Preferably, the SCR catalyst is regenerated on line, the temperature of the flue gas is heated to 320 ℃ during regeneration, the ammonia injection amount is reduced, and the regeneration and the denitration are carried out simultaneously.
Preferably, the treated flue gas is discharged through the coke oven original chimney, so that the coke oven chimney hot standby is realized.
The invention has the beneficial effects that:
1. the ash circulating device effectively solves the problems of bag pasting and corrosion of tar to the cloth bag.
2. The bag-type dust collector can effectively solve the problems that the smoke content is high and the tar affects the desulfurization and denitrification.
3. The flue gas before and after adopting the heat exchanger to carry out the heat transfer with the desulfurization, both satisfied the requirement of desulfurization entry to flue gas temperature, improve the temperature of flue gas after the desulfurization simultaneously, the energy resource consumption of flue gas heating before the reduction denitration.
4. By adopting the active carbon dry desulphurization technology, no wastewater is generated in the desulphurization process, and the by-product is dilute sulfuric acid which can be recycled.
5. By adopting the process of firstly desulfurizing and then denitrating, the problem of poor sulfur resistance of the low-temperature SCR catalyst is effectively solved, and the service life of the catalyst is greatly prolonged.
6. After denitration, the flue gas with the temperature of about 230 ℃ is discharged through the original chimney, so that the problem of chimney hot standby is solved.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention;
in the figure: 1. the system comprises a bag-type dust collector, 2 an ash bin, 3 an ash conveying fan, 4 a heat exchanger, 5 an active carbon desulfurization device, 6 an SCR denitration device, 7 a flue combustor, 8 a combustion-supporting fan, 9 an induced draft fan and 10 a coke oven chimney.
Detailed Description
The invention is further described with reference to the following figures and examples.
Example 1
As shown in figure 1, the comprehensive treatment system for the coke oven flue gas comprises a bag-type dust remover 1, an ash bin 2, an ash conveying fan 3, a heat exchanger 4, an active carbon desulfurization device 5, an SCR (selective catalytic reduction) denitration device 6, a flue burner 7, a combustion fan 8, an induced draft fan 9 and a coke oven chimney 10, wherein the bag-type dust remover 1 is connected with a high-temperature side inlet of the heat exchanger 4, a high-temperature side outlet of the heat exchanger 4 is connected with an inlet of the active carbon desulfurization device 5, an outlet of the active carbon desulfurization device 5 is connected with a low-temperature side inlet of the heat exchanger 4, a low-temperature side outlet of the heat exchanger 4 is connected with the SCR denitration device 6, and the SCR. An inlet pipeline of the ash conveying fan 3 is connected with an original flue gas flue, an outlet pipeline of the ash conveying fan 3 is connected with an inlet flue of the bag-type dust collector 1, a lower pipeline of the ash bin 2 is connected with an outlet pipeline of the ash conveying fan 3, an outlet pipeline of the combustion-supporting fan 8 is connected with the flue combustor 7, and the flue combustor 7 is installed on an inlet flue of the SCR denitration device 6.
When the coke oven gas is combusted, the temperature of the coke oven gas is about 220-240 ℃, the flue gas with the temperature of about 230 ℃ from an underground flue of the coke oven firstly passes through a bag-type dust collector to collect tar and smoke dust in the flue gas, then the flue gas with the temperature of about 220 ℃ is cooled through the high-temperature side of a heat exchanger and then enters an active carbon desulfurization device at the temperature of not higher than 150 ℃, the temperature of the flue gas after desulfurization is about 130 ℃, the temperature of the flue gas after desulfurization is raised through the low-temperature side of the heat exchanger and then is increased to about 200 ℃, the flue gas after temperature rise is increased to not lower than 230 ℃ through a flue combustor and then enters an SCR denitration device, the flue gas after denitration is sent back to a coke oven chimney.
The coke oven smoke contains tar, the bag is pasted by the direct filtering of the tar by the bag, the measure for reducing the tar in the smoke is ash adsorption, the smoke concentration in the coke oven smoke is lower, the invention arranges an ash circulating device for the bag-type dust remover, the ash in the ash bin is blown into the inlet flue of the bag-type dust remover by an ash conveying fan, and enters a dust remover after being mixed with the smoke, and the ash is collected by the bag-type dust remover after absorbing the tar.
A flue burner is arranged in an inlet flue of the SCR denitration device, coke oven gas is used as fuel and is matched with air for combustion to provide heating heat, the coke oven gas and combustion-supporting air from a combustion-supporting fan enter the flue burner for combustion, the coke oven gas and tail gas generated after high-temperature combustion of the burner are directly mixed to improve the temperature of the flue gas in front of the SCR denitration device, the requirement of a denitration catalyst on the temperature of the flue gas is met, and the temperature of the flue gas in front of the SCR denitration device is controlled by adjusting the amount of the coke oven gas entering the burner.
NO after coke oven flue gas treatmentx<100mg/Nm3,SO2<30mg/Nm3Particulate matter < 10mg/Nm3And the ultra-low emission standard is achieved.
Example 2
As shown in figure 1, the comprehensive treatment system for the coke oven flue gas comprises a bag-type dust remover 1, an ash bin 2, an ash conveying fan 3, a heat exchanger 4, an active carbon desulfurization device 5, an SCR (selective catalytic reduction) denitration device 6, a flue burner 7, a combustion fan 8, an induced draft fan 9 and a coke oven chimney 10, wherein the bag-type dust remover 1 is connected with a high-temperature side inlet of the heat exchanger 4, a high-temperature side outlet of the heat exchanger 4 is connected with an inlet of the active carbon desulfurization device 5, an outlet of the active carbon desulfurization device 5 is connected with a low-temperature side inlet of the heat exchanger 4, a low-temperature side outlet of the heat exchanger 4 is connected with the SCR denitration device 6, and the SCR. An inlet pipeline of the ash conveying fan 3 is connected with an original flue gas flue, an outlet pipeline of the ash conveying fan 3 is connected with an inlet flue of the bag-type dust collector 1, a lower pipeline of the ash bin 2 is connected with an outlet pipeline of the ash conveying fan 3, an outlet pipeline of the combustion-supporting fan 8 is connected with the flue combustor 7, and the flue combustor 7 is installed on an inlet flue of the SCR denitration device 6.
When blast furnace gas is combusted, the temperature of the coke oven gas is about 180-200 ℃, the flue gas with the temperature of about 190 ℃ from an underground flue of the coke oven firstly passes through a bag-type dust collector to collect tar and smoke dust in the flue gas, then the flue gas with the temperature of about 180 ℃ is cooled through the high-temperature side of a heat exchanger, the cooled flue gas has the temperature of about 120 ℃ and enters an active carbon desulfurization device, the temperature of the desulfurized flue gas is about 100 ℃, the temperature of the desulfurized flue gas is increased to about 160 ℃ after the temperature of the desulfurized flue gas is increased through the low-temperature side of the heat exchanger, the flue gas with the temperature increased is increased to not less than 230 ℃ through a flue combustor and then enters an SCR denitration device, the denitrated flue gas.
The coke oven smoke contains tar, the bag is pasted by the direct filtering of the tar by the bag, the measure for reducing the tar in the smoke is ash adsorption, the smoke concentration in the coke oven smoke is lower, the invention arranges an ash circulating device for the bag-type dust remover, the ash in the ash bin is blown into the inlet flue of the bag-type dust remover by an ash conveying fan, and enters a dust remover after being mixed with the smoke, and the ash is collected by the bag-type dust remover after absorbing the tar.
A flue burner is arranged in an inlet flue of the SCR denitration device, coke oven gas is used as fuel and is matched with air for combustion to provide heating heat, the coke oven gas and combustion-supporting air from a combustion-supporting fan enter the flue burner for combustion, the coke oven gas and tail gas generated after high-temperature combustion of the burner are directly mixed to improve the temperature of the flue gas in front of the SCR denitration device, the requirement of a denitration catalyst on the temperature of the flue gas is met, and the temperature of the flue gas in front of the SCR denitration device is controlled by adjusting the amount of the coke oven gas entering the burner.
NO after coke oven flue gas treatmentx<100mg/Nm3,SO2<30mg/Nm3Particulate matter < 10mg/Nm3And the ultra-low emission standard is achieved.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

Claims (9)

1. A method for comprehensively treating coke oven flue gas is characterized by comprising the following steps:
1) leading out flue gas from an underground flue of the coke oven and then removing smoke dust and tar in the flue gas by a bag-type dust remover;
2) cooling the flue gas after the bag-type dust collector through the high-temperature side of the heat exchanger, wherein the temperature of the flue gas after cooling is not higher than 150 ℃;
3) the cooled flue gas enters an active carbon desulfurization device for desulfurization;
4) the temperature of the desulfurized flue gas is raised through the low-temperature side of the heat exchanger;
5) heating the flue gas with the temperature increased to be not lower than 230 ℃ by a flue burner, and then feeding the flue gas into an SCR denitration device;
6) and (4) returning the denitrated flue gas to a coke oven chimney through a draught fan, and discharging the flue gas up to the standard.
2. The method for comprehensively treating the coke oven flue gas as claimed in claim 1, wherein the bag-type dust remover is provided with an ash circulating device, the ash circulating device comprises an ash bin and an ash conveying fan, the ash in the ash bin is blown into a flue at the inlet of the bag-type dust remover through the ash conveying fan, the ash is mixed with the flue gas and then enters the dust remover, and the ash is collected by the bag-type dust remover after absorbing tar.
3. The method for comprehensively treating the coke oven flue gas as claimed in claim 2, wherein the inlet air of the ash conveying fan is the raw coke oven flue gas, so as to avoid introducing air from the outside additionally.
4. The method for comprehensively treating the coke oven flue gas as claimed in claim 1, wherein the heat exchanger is a rotary gas-gas heat exchanger or a heat pipe heat exchanger.
5. The method for comprehensively treating coke oven flue gas as claimed in claim 1, wherein the desulfurizing tower of the activated carbon desulfurizing device is provided with 6 identical units, 5 is provided with 1 spare unit, the spare unit is used for activated carbon regeneration, and when the activated carbon is saturated in adsorption, the activated carbon is regenerated by washing with water to generate dilute sulfuric acid.
6. The comprehensive treatment method of the coke oven flue gas as claimed in claim 1, wherein the SCR denitration device adopts a medium-low temperature SCR catalyst, so that the energy consumption required by heating the flue gas is reduced.
7. The method for comprehensively treating the coke oven flue gas as claimed in claim 1, wherein the temperature of the flue gas before the SCR denitration device is raised by a flue combustor.
8. The coke oven flue gas comprehensive treatment method of claim 1, wherein the SCR catalyst adopts on-line regeneration, and during regeneration, the flue gas temperature is heated to 320 ℃, the ammonia injection amount is reduced, and the regeneration and denitration are performed simultaneously.
9. The method for comprehensively treating the coke oven flue gas as claimed in claim 1, wherein the treated flue gas is discharged through a coke oven original chimney, so that the coke oven chimney hot standby is realized.
CN202010026940.3A 2020-01-10 2020-01-10 Comprehensive treatment method for coke oven flue gas Pending CN111151125A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112495132A (en) * 2020-11-30 2021-03-16 江苏新中金环保科技股份有限公司 Coke oven flue gas desulfurization system

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CN105344236A (en) * 2015-11-13 2016-02-24 西南化工研究设计院有限公司 An integrated desulfurization-denitrification-dedusting process for coke oven flue gas
CN106823725A (en) * 2017-01-22 2017-06-13 河北唯沃环境工程科技有限公司 A kind of method of new Type Coke Oven flue gas desulfurization and denitrification
CN207413057U (en) * 2017-09-28 2018-05-29 山东日丽环保科技有限公司 A kind of absorption type dust pelletizing system
CN108159858A (en) * 2018-01-11 2018-06-15 江苏联慧资源环境科技有限公司 A kind of boiler kiln gas purification technique
CN209155342U (en) * 2018-08-28 2019-07-26 武汉华德环保工程技术有限公司 A kind of flue gas multiple pollutant dry method cooperation-removal device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012063466A1 (en) * 2010-11-09 2012-05-18 バブコック日立株式会社 Exhaust gas treatment method and apparatus
CN105344236A (en) * 2015-11-13 2016-02-24 西南化工研究设计院有限公司 An integrated desulfurization-denitrification-dedusting process for coke oven flue gas
CN106823725A (en) * 2017-01-22 2017-06-13 河北唯沃环境工程科技有限公司 A kind of method of new Type Coke Oven flue gas desulfurization and denitrification
CN207413057U (en) * 2017-09-28 2018-05-29 山东日丽环保科技有限公司 A kind of absorption type dust pelletizing system
CN108159858A (en) * 2018-01-11 2018-06-15 江苏联慧资源环境科技有限公司 A kind of boiler kiln gas purification technique
CN209155342U (en) * 2018-08-28 2019-07-26 武汉华德环保工程技术有限公司 A kind of flue gas multiple pollutant dry method cooperation-removal device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112495132A (en) * 2020-11-30 2021-03-16 江苏新中金环保科技股份有限公司 Coke oven flue gas desulfurization system

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