CN111676032A - Coke oven coal charging flue gas purification system and method - Google Patents

Coke oven coal charging flue gas purification system and method Download PDF

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Publication number
CN111676032A
CN111676032A CN202010602431.0A CN202010602431A CN111676032A CN 111676032 A CN111676032 A CN 111676032A CN 202010602431 A CN202010602431 A CN 202010602431A CN 111676032 A CN111676032 A CN 111676032A
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China
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flue gas
charging
coal
coke oven
gas
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Chinese (zh)
Inventor
高峰
杨伟明
杜雄伟
吴英军
孙加亮
叶小虎
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Beijing Jingcheng Zeyu Energy Environmental Protection Engineering Technology Co ltd
MCC Capital Engineering and Research Incorporation Ltd
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Beijing Jingcheng Zeyu Energy Environmental Protection Engineering Technology Co ltd
MCC Capital Engineering and Research Incorporation Ltd
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Priority to CN202010602431.0A priority Critical patent/CN111676032A/en
Publication of CN111676032A publication Critical patent/CN111676032A/en
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B43/00—Preventing or removing incrustations
    • C10B43/02—Removing incrustations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/02—Separation 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8603—Removing sulfur compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/306—Organic sulfur compounds, e.g. mercaptans
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
    • B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
    • B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas

Abstract

The invention relates to a coke oven coal-charging flue gas purification system and a method, the coke oven coal-charging flue gas purification system comprises a coal-charging dust removal device, a flue gas heat exchanger, an adsorption purification device, a regenerative heater and a sulfur recovery device, wherein an air inlet of the coal-charging dust removal device is used for being connected with a coal charging hole of a coke oven, an air outlet of the coal-charging dust removal device is connected with an air inlet of the flue gas heat exchanger, a first air outlet of the flue gas heat exchanger is connected with an air inlet of the adsorption purification device, a second air outlet of the flue gas heat exchanger is connected with an air inlet of the regenerative heater, an air outlet of the regenerative heater is connected with an air inlet of the adsorption purification device, an air return port of the adsorption purification device is connected with an air inlet of the. The invention solves the technical problems of poor system operation stability and poor purification effect of pollutants such as sulfide and the like in the coal charging process of the coke oven.

Description

Coke oven coal charging flue gas purification system and method
Technical Field
The invention relates to the field of flue gas treatment, in particular to a system and a method for purifying coal-charging flue gas of a coke oven.
Background
With the rapid development of the steel industry, the usage amount of the coking coal is greatly improved. A large amount of sulfur dioxide and smoke dust generated in the coking process become important sources of air pollution, a large amount of smoke gas escapes from a coal charging hole in the coal charging operation process of the coke oven, pollutants are discharged in a burst mode along with the coal charging operation, the pollutants discharged to the outside in the coal charging process account for 50-60% of the total pollutants discharged in the coking process, and the pollutants contain a large amount of dust and sulfides.
The existing method for purifying the coke oven coal-charging flue gas can remove most of dust in the pollutants discharged to the outside in the coal charging process by arranging the ground dust removal station, but cannot effectively remove the pollutants such as sulfide in the flue gas, so that the coke oven coal-charging flue gas is discharged in an overproof manner. Therefore, before entering the atmosphere, the coke oven coal-charging flue gas not only needs to remove dust in the flue gas, but also needs to be further purified to remove pollutants such as sulfide carried in the flue gas.
At present, most of coke oven coal-charging flue gas of comprehensive iron and steel plants and independent coke plants is treated by a ground dust removal station, part of dust is removed, and then the flue gas is directly discharged into the atmosphere, and a small number of enterprises adopt wet desulphurization or semi-dry desulphurization technology to further treat the flue gas after dust removal, so that the above methods cannot ensure that the flue gas reaches the standard and is discharged. Mainly due to the following reasons: the method comprises the following steps that firstly, the coal charging process of the coke oven belongs to intermittent operation, the coal charging flue gas of the coke oven is emitted in a burst manner, so that the fluctuation of the gas flow of the flue gas is large, and the fluctuation of the content of impurities such as sulfide in the flue gas in different periods is also large, so that the wet method and semi-dry method desulfurization technology is adopted, a control system needs to be frequently adjusted to deal with the fluctuation of the gas flow and the impurities in the flue gas, the steady-state operation of the system is not facilitated, the energy consumption is large, the scale; secondly, because the content of impurities such as sulfide in the coal charging flue gas of the coke oven is influenced by the quality of the coal to be charged, when different batches of coal are used for coking operation, the concentration difference of the impurities such as sulfide in the coal charging flue gas is large, so the existing operation system and the consumption of energy media need to be readjusted, a large amount of secondary pollution can be generated, and the stable operation and the operation of the system are not facilitated.
Aiming at the problems of poor system operation stability and poor purifying effect of pollutants such as sulfide and the like in the coal charging process of a coke oven in the related technology, no effective solution is provided at present.
Therefore, the inventor provides a coke oven coal-charging flue gas purification system and method by virtue of experience and practice of related industries for many years, so as to overcome the defects in the prior art.
Disclosure of Invention
The invention aims to provide a coke oven coal-charging flue gas purification system and a coke oven coal-charging flue gas purification method, which are used for effectively removing pollutants such as sulfide in the coke oven coal-charging flue gas by adopting flue gas dust removal, flue gas fan pressurization, heat exchange cooling, cooling and adsorption purification treatment on the coke oven coal-charging flue gas, discharging the purified flue gas into the atmosphere through a chimney, ensuring that the system can circularly and stably run by regenerating a desulfurization adsorbent, and performing subsequent treatment on substances such as sulfide in the regenerated gas, better solving the problems of poor system operation stability and poor purification effect of pollutants such as sulfide, and can be used for production and purification of the coke oven coal-charging flue gas.
The purpose of the invention can be realized by adopting the following technical scheme:
the invention provides a coke oven coal-charging flue gas purification system, which comprises a coal-charging dust removal device, a flue gas heat exchanger, an adsorption purification device, a regenerative heater and a sulfur recovery device, wherein:
the gas inlet of the coal charging and dust removing device is used for being connected with a coal charging hole of the coke oven, the gas outlet of the coal charging and dust removing device is connected with the gas inlet of the flue gas heat exchanger, the first gas outlet of the flue gas heat exchanger is connected with the gas inlet of the adsorption and purification device, the second gas outlet of the flue gas heat exchanger is connected with the gas inlet of the regeneration heater, the gas outlet of the regeneration heater is connected with the gas inlet of the adsorption and purification device, the gas return port of the adsorption and purification device is connected with the gas inlet of the flue gas heat exchanger, and the gas outlet of the adsorption and purification device is connected with the gas inlet of the sulfur recovery.
In a preferred embodiment of the present invention, the coke oven coal charging flue gas purification system further includes a flue gas cooler, the flue gas cooler is disposed between the flue gas heat exchanger and the adsorption purification device, an air inlet of the flue gas cooler is connected to the first air outlet of the flue gas heat exchanger, and an air outlet of the flue gas cooler is connected to the air inlet of the adsorption purification device.
In a preferred embodiment of the present invention, a flue gas blower is disposed between the coal charging dust removal device and the flue gas heat exchanger, an air inlet of the flue gas blower is connected to an air outlet of the coal charging dust removal device, and an air outlet of the flue gas blower is connected to an air inlet of the flue gas heat exchanger.
In a preferred embodiment of the present invention, a regeneration fan is disposed between the adsorption purification device and the sulfur recovery device, an air inlet of the regeneration fan is connected to an air outlet of the adsorption purification device, and an air outlet of the regeneration fan is connected to an air inlet of the adsorption purification device.
In a preferred embodiment of the present invention, the third air outlet of the flue gas heat exchanger is connected to a chimney.
In a preferred embodiment of the invention, the coal charging dust removal device is composed of a coke oven coal charging ground dust removal station and supporting facilities thereof.
In a preferred embodiment of the present invention, the flue gas heat exchanger is an indirect heat exchanger.
In a preferred embodiment of the present invention, the adsorption purification apparatus is a plurality of adsorption purification towers, the adsorption purification towers are connected in parallel, and an adsorbent capable of being recycled is provided in each adsorption purification tower.
In a preferred embodiment of the present invention, the adsorbent is a microcrystalline material, a molecular sieve or activated carbon.
In a preferred embodiment of the present invention, at least one of the adsorption purification towers is a spare adsorption purification tower.
In a preferred embodiment of the present invention, the regenerative heater is a steam heater or an electric heater.
In a preferred embodiment of the present invention, the sulfur recovery device is an acid production plant or a salt production plant.
The invention provides a coke oven coal-charging flue gas purification method, which adopts the coke oven coal-charging flue gas purification system and comprises the following steps:
step S1: the coke oven coal-charging flue gas escapes from a coal-charging hole of the coke oven and forms a first air flow;
step S2: the first air flow enters a coal charging and dust removing device, and the coal charging and dust removing device removes dust contained in the first air flow and forms a second air flow;
step S3: the second airflow enters a flue gas heat exchanger, and exchanges heat with a medium in the flue gas heat exchanger to reduce the temperature and form a third airflow;
step S4: the third gas flow enters an adsorption purification device, and an adsorbent in the adsorption purification device adsorbs sulfides contained in the third gas flow to form a fourth gas flow;
step S5: the fourth airflow flows back to the flue gas heat exchanger to be used as a medium in the step S3 to exchange heat with the second airflow and raise the temperature, and a fifth airflow is formed;
step S6: the fifth gas flow enters a regenerative heater, and the regenerative heater further heats the fifth gas flow so that the temperature of the fifth gas flow reaches the temperature for regenerating the adsorbent in the adsorption saturation state in the step S4, and a sixth gas flow is formed;
step S7: the sixth gas flow enters the adsorption purification device to regenerate the adsorbent which reaches the adsorption saturation state, and the sulfur-containing gas generated after regeneration is discharged from the adsorption purification device to form a seventh gas flow;
step S8: and the seventh gas flow enters a sulfur recovery device, and the materials in the sulfur recovery device react with sulfur-containing gas to prepare acid or salt.
In a preferred embodiment of the present invention, the second airflow in the step S2 is pressurized by a flue gas blower and then enters the flue gas heat exchanger in the step S3.
In a preferred embodiment of the present invention, the third air flow in the step S3 is cooled by a flue gas cooler and then enters the adsorption purification apparatus in the step S4.
In a preferred embodiment of the present invention, the fifth airflow in the step S6 is further directly discharged to the outside through a chimney.
In a preferred embodiment of the present invention, the seventh airflow in the step S7 is pressurized by a regeneration blower and then enters the sulfur recovery device in the step S8.
From the above, the coke oven coal-charging flue gas purification system and method of the invention have the characteristics and advantages that: the air inlet of the coal-charging dust removal device is connected with the coal-charging hole of the coke oven, and the coal-charging dust removal device filters dust contained in the coal-charging flue gas, so that the effect of preliminarily purifying the coal-charging flue gas is achieved. In addition, the gas outlet of the coal-charging dust removal device is connected with the gas inlet of the adsorption purification device through the flue gas heat exchanger, pollutants such as sulfide and the like contained in the coal-charging flue gas can be adsorbed and removed through the adsorption purification device, the standard emission of the coal-charging flue gas of the coke oven is realized, the flue gas heat exchanger is connected with the gas inlet of the adsorption purification device through the regenerative heater, the gas return port of the adsorption purification device is connected with the gas inlet of the flue gas heat exchanger, the adsorbent in an adsorption saturation state in the adsorption purification device can be regenerated through heating, the purified flue gas is used as the regeneration gas in the regeneration process of the adsorbent, the regeneration gas is not required to be introduced from the outside, the reduction emission of the pollution gas can be realized, the regenerated adsorbent can continuously adsorb and remove the pollutants such as the sulfide and the like contained in the coal-charging flue gas, stable operation reduces secondary pollution simultaneously and discharges, because the gas outlet of adsorbing purifier is connected with sulfur recovery unit's air inlet, the sulphide accessible sulfur recovery unit of desorption carries out subsequent processing from the adsorbent, reaches the abundant purification to pollutants such as sulphide in the coal-charging flue gas. Under the intermittent operation state of the coke oven coal charging process, the purification system does not need to be frequently adjusted to adapt to the paroxysmal emission, can realize the long-time steady operation and operation of the purification system, and is suitable for the production and purification of the coke oven coal charging flue gas.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention.
Wherein:
FIG. 1: is a structural block diagram of a first embodiment in the coke oven coal-charging flue gas purification system.
FIG. 2: is a structural block diagram of a second embodiment in the coke oven coal-charging flue gas purification system.
FIG. 3: is a structural block diagram of a third embodiment in the coke oven coal-charging flue gas purification system.
FIG. 4: is a structural block diagram of a fourth embodiment in the coke oven coal-charging flue gas purification system.
FIG. 5: is a structural block diagram of a fifth embodiment in the coke oven coal-charging flue gas purification system.
FIG. 6: the invention relates to a flow chart of a coke oven coal-charging flue gas purification method.
The reference numbers in the invention are:
1. a coke oven; 2. A coal charging dust removal device;
3. a flue gas fan; 4. A flue gas heat exchanger;
5. a flue gas cooler; 6. An adsorption purification device;
7. a regenerative heater; 8. A regenerative fan;
9. a chimney; 10. A sulfur recovery unit.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
Example one
As shown in figure 1, the invention provides a coke oven coal charging flue gas purification system, which comprises a coal charging dust removal device 2, a flue gas heat exchanger 4, an adsorption purification device 6, a regenerative heater 7 and a sulfur recovery device 10, wherein: the air inlet of the coal charging and dust removing device 2 is used for being connected with the coal charging hole of the coke oven 1, the air outlet of the coal charging and dust removing device 2 is connected with the air inlet of the flue gas heat exchanger 4, the first air outlet of the flue gas heat exchanger 4 is connected with the air inlet of the adsorption and purification device 6, the second air outlet of the flue gas heat exchanger 4 is connected with the air inlet of the regenerative heater 7, the air outlet of the regenerative heater 7 is connected with the air inlet of the adsorption and purification device 6, the air return port of the adsorption and purification device 6 is connected with the air inlet of the flue gas heat exchanger 4, and the air outlet of the adsorption and purification.
According to the invention, the air inlet of the coal charging dust removal device 2 is connected with the coal charging hole of the coke oven 1, and the coal charging dust removal device 2 is used for filtering dust contained in coal charging flue gas, so that the effect of primarily purifying the coal charging flue gas is achieved. In addition, the gas outlet of the coal-charging dust-removing device 2 is connected with the gas inlet of the adsorption and purification device 6 through the flue gas heat exchanger 4, pollutants such as sulfide and the like contained in the coal-charging flue gas can be adsorbed and removed through the adsorption and purification device 6, the standard discharge of the coal-charging flue gas of the coke oven is realized, the flue gas heat exchanger 4 is connected with the gas inlet of the adsorption and purification device 6 through the regenerative heater 7, the gas return port of the adsorption and purification device 6 is connected with the gas inlet of the flue gas heat exchanger 4, the adsorbent in the adsorption and purification device 6 in the adsorption and purification state can be regenerated through heating, in the regeneration process of the adsorbent, the purified flue gas is used as the regeneration gas, the regeneration gas is not required to be introduced from the outside, the reduction and discharge of the pollution gas can be realized, and the regenerated adsorbent can continuously adsorb and remove the pollutants such, the system can be ensured to operate circularly and stably, and the secondary pollution emission is reduced simultaneously, because the gas outlet of the adsorption and purification device 6 is connected with the gas inlet of the sulfur recovery device 10, the sulfide desorbed from the adsorbent can be subjected to subsequent treatment through the sulfur recovery device 10, and the full purification of pollutants such as sulfide in the coal-charging flue gas is achieved. Under the intermittent operation state of the coke oven coal charging process, the purification system does not need to be frequently adjusted to adapt to the paroxysmal emission, can realize the long-time steady operation and operation of the purification system, and is suitable for the production and purification of the coke oven coal charging flue gas.
In an alternative embodiment of the present invention, as shown in fig. 2, the coke oven coal charging flue gas purification system further includes a flue gas cooler 5, the flue gas cooler 5 is disposed between the flue gas heat exchanger 4 and the adsorption purification device 6, an air inlet of the flue gas cooler 5 is connected to a first air outlet of the flue gas heat exchanger 4, and an air outlet of the flue gas cooler 5 is connected to an air inlet of the adsorption purification device 6. The coal-charging flue gas passing through the flue gas heat exchanger 4 is further cooled by the flue gas cooler 5, so that sulfides contained in the coal-charging flue gas can be fully adsorbed by the adsorbent after entering the adsorption and purification device 6.
In an alternative embodiment of the present invention, as shown in fig. 3, a flue gas fan 3 is disposed between the coal charging dust removing device 2 and the flue gas heat exchanger 4, an air inlet of the flue gas fan 3 is connected to an air outlet of the coal charging dust removing device 2, and an air outlet of the flue gas fan 3 is connected to an air inlet of the flue gas heat exchanger 4. The coal-charging flue gas passing through the coal-charging dust removal device 2 is pressurized by the flue gas fan 3, and the coal-charging flue gas can be enabled to completely enter the flue gas heat exchanger 4.
In an alternative embodiment of the present invention, as shown in fig. 4, a regeneration fan 8 is disposed between the adsorption purification device 6 and the sulfur recovery device 10, an air inlet of the regeneration fan 8 is connected to an air outlet of the adsorption purification device 6, and an air outlet of the regeneration fan 8 is connected to an air inlet of the adsorption purification device 6. Pressurize the sulphur gas who follows desorption among the adsorption purification device 6 through regeneration blower 8, guarantee that sulphur gas can all enter into to sulphur recovery unit 10 in for can fully get rid of sulphur gas.
In an alternative embodiment of the invention, as shown in fig. 5, the third outlet of the flue gas heat exchanger 4 is connected to a chimney 9. The low-temperature coal-charging flue gas in the adsorption and purification device 6 from which the sulfide is removed by the adsorbent returns to the flue gas heat exchanger 4 through the air return port of the adsorption and purification device 6 to be used as a heat exchange medium, and can be directly discharged to the outside through the chimney 9 after exchanging heat with the coal-charging flue gas to be treated.
Further, the coal charging dust removal device 2 is composed of a coke oven coal charging ground dust removal station and supporting facilities thereof, and comprises a motor, a fan, a dust collecting main pipe, a bag-type dust remover, a flue gas adsorption device, a humidifying dust unloading machine and other equipment, so that dust in the coal charging flue gas can be filtered.
Further, the flue gas heat exchanger 4 is an indirect heat exchanger.
Furthermore, the adsorption purification device 6 is composed of 2 to 12 adsorption purification towers, all the adsorption purification towers are connected in parallel, an adsorbent capable of being recycled and regenerated is arranged in each adsorption purification tower, and each adsorption purification tower can be used for independently adsorbing and removing pollutants such as sulfide contained in the coal-charging flue gas.
In an optional embodiment of the invention, the adsorbent is a microcrystalline material, a molecular sieve or activated carbon, the adsorbent can adsorb pollutants such as sulfide contained in the coal-charging flue gas, and the adsorbent can desorb and regenerate the pollutants such as sulfide after the temperature is raised.
The microcrystalline material is made of at least one element of magnesium, calcium, strontium, yttrium, lanthanum, cerium, europium, iron, cobalt, nickel, copper, silver, zinc and the like, and is selected from at least one of X-type molecular sieve, Y-type molecular sieve, A-type molecular sieve, ZSM-type molecular sieve, mordenite, β -type molecular sieve, MCM-type molecular sieve and SAPO-type molecular sieve, wherein the catalyst for converting organic sulfur into inorganic sulfur comprises an iron-cobalt-manganese-molybdenum-nickel catalyst, CO-K-Al catalyst and a catalyst for converting organic sulfur into inorganic sulfur2O3、ZrO2/TiO2At least one of catalysts; and in practical implementation, the amount of the catalyst can be reasonably set by a person skilled in the art according to the field operation requirement. Wherein, the microcrystal material has stronger adsorption capacity at the temperature of 20-80 ℃, can be desorbed and regenerated at the temperature of 160-350 ℃, and the adsorbed organic sulfur is catalytically converted into inorganic sulfur in situ during regeneration.
Furthermore, at least one of the adsorption purification towers is a standby adsorption purification tower.
Further, the regenerative heater 7 may be, but is not limited to, a steam heater or an electric heater.
Further, the sulfur recovery device 10 is a sulfuric acid production facility or a sulfate production facility, and can react with pollutants such as sulfide introduced into the sulfur recovery device 10.
The coke oven coal charging flue gas purification system has the characteristics and advantages that:
the coke oven coal-charging flue gas purification system filters dust contained in coal-charging flue gas through the coal-charging dust removal device 2 to achieve the effect of primarily purifying the coal-charging flue gas, pollutants such as sulfide and the like contained in the coal-charging flue gas can be adsorbed and removed through the adsorption purification device 6 to achieve standard emission of the coal-charging flue gas of the coke oven, the adsorbent in an adsorption saturation state in the adsorption purification device 6 can be regenerated through heating, in the regeneration process of the adsorbent, purified flue gas is used as regenerated gas, the regenerated gas is not required to be introduced from the outside, the consumption of energy media is reduced, the reduction emission of pollution gas can be achieved, the regenerated adsorbent can continuously adsorb and remove the pollutants such as sulfide and the like contained in the coal-charging flue gas, the system can be ensured to operate circularly and stably, meanwhile, the secondary pollution emission is reduced, the sulfide desorbed from the adsorbent can be subjected to subsequent treatment through the sulfur recovery device 10, the full purification of pollutants such as sulfide in the coal-charging flue gas is achieved, and the standard emission of the flue gas is realized. Under the intermittent operation state of the coke oven coal charging process, the purification system does not need to be frequently adjusted to adapt to the paroxysmal emission, can realize the long-time steady operation and operation of the purification system, and is suitable for the production and purification of the coke oven coal charging flue gas.
Example two
As shown in FIG. 6, the invention provides a coke oven coal charging flue gas purification method, which adopts the coke oven coal charging flue gas purification system, and comprises the following steps:
step S1: the coal charging flue gas of the coke oven escapes from a coal charging hole of the coke oven 1 and forms a first air flow, the first air flow is discharged in a burst manner, and the flow rate of the first air flow and the concentration of pollutants such as dust, sulfide and the like in the first air flow show larger fluctuation in the coal charging process and the coal charging intermittent process.
Step S2: the first air flow enters a coal charging dust removal device 2, the coal charging dust removal device 2 generally comprises a coke oven coal charging ground dust removal station and matched equipment, the coal charging dust removal device 2 removes most of dust contained in the first air flow and forms a second air flow, the temperature of the second air flow is 40-120 ℃, and the sulfide content in the second air flow is 10mg/m3To 120mg/m3The dust content in the second gas stream was 0.01mg/m3To 20mg/m3。
Step S3: the second air flow enters the flue gas heat exchanger 4, the second air flow and the medium in the flue gas heat exchanger 4 exchange heat and cool, a third air flow is formed, and the flue gas heat exchanger 4 generally adopts indirect heat exchange.
Step S4: the third air flow enters an adsorption purification device 6, and an adsorbent in the adsorption purification device 6 adsorbs sulfides contained in the third air flow to form a fourth air flow; the adsorption purification device 6 generally comprises 2 to 12 adsorption purification towers, wherein at least 1 adsorption purification tower is in a standby or regeneration state; each adsorption purification tower in the adsorption purification device 6 is filled with an adsorbent, the adsorbent can be selected from microcrystalline materials, molecular sieves, activated carbon and other materials which have good adsorption performance and can be recycled, the adsorbent filled in each adsorption purification tower can be saturated after adsorption purification operation for 5 to 25 days, the saturated adsorbent can be subjected to regeneration desorption through temperature rise, and the adsorbent subjected to regeneration desorption can be recycled.
Step S5: the fourth airflow flows back to the flue gas heat exchanger 4 to be used as a medium in the step S3 to exchange heat with the second airflow and raise the temperature, and a fifth airflow is formed; at this time, the second airflow is a high-temperature side airflow, the fourth airflow is a low-temperature side airflow, the temperature of the second airflow and the fourth airflow is reduced after heat exchange is performed in the flue gas heat exchanger 4, and the temperature of the fourth airflow is increased and sent to the regenerative heater 7.
Step S6: and (3) enabling a part of the fifth airflow to enter the regenerative heater 7, directly discharging the other part of the fifth airflow to the outside through a chimney 9, further heating the fifth airflow by the regenerative heater 7, wherein the regenerative heater 7 can adopt a medium-low pressure steam or electric heating mode and the like so as to enable the temperature of the fifth airflow to reach the temperature for regenerating the adsorbent in the adsorption saturation state in the step S4 and form a sixth airflow, and the temperature of the sixth airflow is 160-260 ℃.
Step S7: the sixth gas flow enters the adsorption purification device 6 to regenerate the adsorbent which reaches the adsorption saturation state, and the regenerated sulfur-containing gas is discharged from the adsorption purification device 6 to form a seventh gas flow;
step S8: and the seventh gas flow enters the sulfur recovery device 10, and the materials in the sulfur recovery device 10 react with the sulfur-containing gas to perform acid making or salt making treatment, so that the impurities such as sulfide and the like carried in the seventh gas flow are subjected to resource recovery.
In an alternative embodiment of the present invention, the second airflow in step S2 is pressurized by the flue gas blower 3 and then enters the flue gas heat exchanger 4 in step S3. The pressure after the pressurization of the flue gas fan 3 is 3kPa to 10kPa (gauge pressure), and the flue gas fan 3 can carry out frequency conversion adjustment according to the actual output quantity of the second airflow.
In an alternative embodiment of the present invention, the third air flow in step S3 is cooled by the flue gas cooler 5 and enters the adsorption purification device 6 in step S4. The flue gas cooler 5 can adopt circulating water or cooling water as a cold source to indirectly cool the third air flow, and the temperature of the cooled third air flow is 40-80 ℃.
In an alternative embodiment of the present invention, the seventh air stream in step S7 is pressurized by the regeneration fan 8 and then enters the sulfur recovery device 10 in step S8, so as to ensure sufficient recovery of the seventh air stream.
The coke oven coal charging flue gas purification method has the characteristics and advantages that:
according to the method for purifying the coke oven coal-charging flue gas, the adsorption and purification device 6 is additionally arranged behind the coal-charging dust removal device 2, so that pollutants such as sulfide in the coke oven coal-charging flue gas can be removed, and the coke oven coal-charging flue gas can be discharged up to the standard.
By using the method for purifying the coal-charging flue gas of the coke oven, even under the condition that the intermittent emission of the coal-charging flue gas is caused by the intermittent operation in the coal charging process of the coke oven, the purification system does not need to be frequently adjusted to adapt to the intermittent emission, and the long-time steady-state operation and operation of the purification system can be realized.
By using the method for purifying the coke oven coal-charging flue gas, even under the condition of large fluctuation of the concentration of impurities such as sulfide in the coal-charging flue gas caused by intermittent operation in the coke oven coal-charging process, the purification system does not need to be frequently adjusted to adapt to paroxysmal discharge, and the long-time steady-state operation and operation of the purification system can be realized.
By using the method for purifying the coke oven coal-charging flue gas, even if different coals are adopted for charging in the coke oven coal charging process, the concentration of impurities such as sulfide in the coal-charging flue gas is changed, the purification system does not need to be frequently adjusted to adapt to the paroxysmal discharge, and the long-time steady-state operation and operation of the purification system can be realized.
Fifthly, in the process of purifying the coke coal charging flue gas, the flue gas heat exchanger 4 is used for carrying out cold and hot flue gas heat exchange, so that the primary cooling of the hot flue gas and the primary heating of the cold flue gas can be realized, the energy medium consumption in the subsequent cooling and heating processes can be greatly reduced, and the reasonable recovery and utilization of the system heat can be realized.
Sixthly, in the coke oven coal-charging flue gas purification method, in the coke oven coal-charging flue gas purification process, the adsorbent which can be regenerated and recycled is filled in the adsorption purification tower, so that the recycling of the system can be realized, and the secondary pollution emission is reduced.
And seventhly, in the process of regenerating the adsorbent, the purified flue gas is used as the regeneration gas, so that the regeneration gas does not need to be introduced from the outside, and the reduction emission of the pollution gas can be realized.
Eighthly, the coke oven coal-charging flue gas purification method can realize resource recovery of pollutants such as sulfide in the coal-charging flue gas through the conventional sulfur recovery device 10, and can realize digestion and no discharge of the pollutants in a system.
Ninth, in the flue gas cooling and heating process of the coke oven coal charging flue gas purification method, the required energy media are cooling water, circulating water or medium-low pressure steam, and the energy media are easy to find in factories, so that the cost is reduced, and the construction is convenient.
The coke oven coal-charging flue gas purification method has the advantages of simple process flow, convenient operation, small occupied area, energy conservation and environmental protection, and is suitable for large-scale popularization and use.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention.

Claims (17)

1. The coke oven coal charging flue gas purification system is characterized by comprising a coal charging dust removal device (2), a flue gas heat exchanger (4), an adsorption purification device (6), a regenerative heater (7) and a sulfur recovery device (10), wherein:
the gas inlet of the coal charging and dust removing device (2) is used for being connected with a coal charging hole of the coke oven (1), the gas outlet of the coal charging and dust removing device (2) is connected with the gas inlet of the flue gas heat exchanger (4), the first gas outlet of the flue gas heat exchanger (4) is connected with the gas inlet of the adsorption and purification device (6), the second gas outlet of the flue gas heat exchanger (4) is connected with the gas inlet of the regenerative heater (7), the gas outlet of the regenerative heater (7) is connected with the gas inlet of the adsorption and purification device (6), the gas return port of the adsorption and purification device (6) is connected with the gas inlet of the flue gas heat exchanger (4), and the gas outlet of the adsorption and purification device (6) is connected with the gas inlet of the sulfur recovery device (10).
2. The coke oven coal-charging flue gas purification system of claim 1, further comprising a flue gas cooler (5), wherein the flue gas cooler (5) is disposed between the flue gas heat exchanger (4) and the adsorption purification device (6), an air inlet of the flue gas cooler (5) is connected to a first air outlet of the flue gas heat exchanger (4), and an air outlet of the flue gas cooler (5) is connected to an air inlet of the adsorption purification device (6).
3. The coke oven coal-charging flue gas purification system of claim 1, characterized in that a flue gas fan (3) is arranged between the coal-charging dust removal device (2) and the flue gas heat exchanger (4), the gas inlet of the flue gas fan (3) is connected with the gas outlet of the coal-charging dust removal device (2), and the gas outlet of the flue gas fan (3) is connected with the gas inlet of the flue gas heat exchanger (4).
4. The coke oven coal-charging flue gas purification system of claim 1, wherein a regeneration fan (8) is arranged between the adsorption purification device (6) and the sulfur recovery device (10), an air inlet of the regeneration fan (8) is connected with an air outlet of the adsorption purification device (6), and an air outlet of the regeneration fan (8) is connected with an air inlet of the adsorption purification device (6).
5. The coke oven coal-charging flue gas cleaning system of claim 1, wherein the third gas outlet of the flue gas heat exchanger (4) is connected to a chimney (9).
6. The coke oven coal-charging flue gas purification system of claim 1, wherein the coal-charging dust removal device (2) is composed of a coke oven coal-charging ground dust removal station and its supporting facilities.
7. The coke oven coal charging flue gas cleaning system of claim 1, wherein the flue gas heat exchanger (4) is an indirect heat exchanger.
8. The coke oven coal-charging flue gas purification system of claim 1, wherein the adsorption purification device (6) is a plurality of adsorption purification towers, the adsorption purification towers are connected in parallel, and an adsorbent capable of being recycled and reused is arranged in each adsorption purification tower.
9. The coke oven coal-charging flue gas purification system of claim 8, wherein the sorbent is a microcrystalline material, a molecular sieve, or activated carbon.
10. The coke oven coal-charging flue gas cleaning system of claim 8, wherein at least one of the adsorption cleaning towers is a spare adsorption cleaning tower.
11. The coke oven coal charging flue gas cleaning system of claim 1, characterized in that the regenerative heater (7) is a steam heater or an electric heater.
12. The coke oven coal-charging flue gas cleaning system of claim 1, wherein the sulfur recovery unit (10) is an acid plant or a salt plant.
13. A coke oven coal-charging flue gas purification method is characterized in that the coke oven coal-charging flue gas purification method adopts the coke oven coal-charging flue gas purification system of any one of claims 1 to 12, and the coke oven coal-charging flue gas purification method comprises the following steps:
step S1: the coal charging flue gas of the coke oven escapes from a coal charging hole of the coke oven (1) and forms a first air flow;
step S2: the first air flow enters a coal charging and dust removing device (2), and the coal charging and dust removing device (2) removes dust contained in the first air flow and forms a second air flow;
step S3: the second airflow enters the flue gas heat exchanger (4), and exchanges heat with the medium in the flue gas heat exchanger (4) to reduce the temperature and form a third airflow;
step S4: the third gas flow enters an adsorption purification device (6), and an adsorbent in the adsorption purification device (6) adsorbs sulfides contained in the third gas flow to form a fourth gas flow;
step S5: the fourth airflow flows into the flue gas heat exchanger (4) to be used as a medium in the step S3 to exchange heat with the second airflow and raise the temperature, and a fifth airflow is formed;
step S6: the fifth gas flow enters a regenerative heater (7), and the regenerative heater (7) further heats the fifth gas flow so that the temperature of the fifth gas flow reaches the temperature for regenerating the adsorbent in the adsorption saturation state in the step S4, and a sixth gas flow is formed;
step S7: the sixth gas flow enters the adsorption purification device (6) to regenerate the adsorbent which reaches the adsorption saturation state, and the sulfur-containing gas generated after regeneration is discharged from the adsorption purification device (6) to form a seventh gas flow;
step S8: and the seventh gas flow enters a sulfur recovery device (10), and materials in the sulfur recovery device (10) react with sulfur-containing gas to carry out acid making or salt making treatment.
14. The coke oven coal-charging flue gas cleaning method of claim 13, characterized in that the second gas flow in the step S2 is pressurized by a flue gas fan (3) and then enters the flue gas heat exchanger (4) in the step S3.
15. The coke oven coal-charging flue gas cleaning method of claim 13, characterized in that the third gas flow in the step S3 is cooled by a flue gas cooler (5) and enters the adsorption cleaning device (6) in the step S4.
16. The coke oven coal-charging flue gas cleaning method as claimed in claim 13, characterized in that the fifth gas flow in step S6 is also discharged directly to the outside through a chimney (9).
17. The coke oven coal-charging flue gas cleaning method of claim 13, characterized in that the seventh gas stream in the step S7 is pressurized by a regeneration fan (8) and then enters the sulfur recovery device (10) in the step S8.
CN202010602431.0A 2020-06-29 2020-06-29 Coke oven coal charging flue gas purification system and method Pending CN111676032A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112774412A (en) * 2020-12-17 2021-05-11 国网河北省电力有限公司电力科学研究院 Flue gas treatment device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112774412A (en) * 2020-12-17 2021-05-11 国网河北省电力有限公司电力科学研究院 Flue gas treatment device

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