CN115069070A - System and method for anaerobic positive pressure recovery of coal-based needle coke tail gas - Google Patents

System and method for anaerobic positive pressure recovery of coal-based needle coke tail gas Download PDF

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CN115069070A
CN115069070A CN202210895034.6A CN202210895034A CN115069070A CN 115069070 A CN115069070 A CN 115069070A CN 202210895034 A CN202210895034 A CN 202210895034A CN 115069070 A CN115069070 A CN 115069070A
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pipeline
valve
tail gas
pressure
gas
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高占先
刘海丰
张宝磊
王志江
王政强
李元元
阎劲松
张玉峰
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Anshan Chemical Technology Co ltd
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • 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
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    • B01D53/1412—Controlling the absorption process
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    • 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
    • B01D53/14—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 absorption
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    • 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
    • B01D53/14—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 absorption
    • B01D53/1493—Selection of liquid materials for use as absorbents
    • 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
    • B01D53/14—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 absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/14—Production of inert gas mixtures; Use of inert gases in general
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/50—Control or safety arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/40—Absorbents explicitly excluding the presence of water
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
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    • B01D2252/504—Mixtures of two or more absorbents
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D2257/7027—Aromatic hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D2258/00—Sources of waste gases
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D2258/00—Sources of waste gases
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    • B01D2258/0283—Flue gases

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Abstract

The invention relates to the technical field of coal-based needle coke tail gas recovery, in particular to a system and a method for recovering coal-based needle coke tail gas under anaerobic positive pressure. The oil groove and the flue gas scrubber are both in positive pressure and are in positive pressure recovery; the positive pressure can reduce the volatilization of non-methane aromatic hydrocarbons in various oil products. According to the invention, nitrogen is introduced into the oil tank and the conveying pipeline, and the protection of the nitrogen can realize the positive pressure recovery of oxygen insulation, so that the intrinsic safety recovery is achieved. The top of the oil tank is provided with a relief valve, a single-breathing valve, a self-supporting regulating valve group, a breathing valve and an electronic pressure gauge, and the oil tank is provided with various safety accessories so as to ensure that the oil tank cannot be deflated or expanded under abnormal conditions. The positive pressure recovery is easier to find when leakage occurs than the method for recovering tail gas under negative pressure, thereby avoiding the occurrence of malignant accidents. The tail gas of the invention is finally led to a negative pressure gas pipeline or an incinerator, and compared with the tail gas which is recycled in an open way, the tail gas recovery system has smaller gas quantity and is more energy-saving.

Description

System and method for anaerobic positive pressure recovery of coal-based needle coke tail gas
Technical Field
The invention relates to the technical field of coal-based needle coke tail gas recovery, in particular to a system and a method for recovering coal-based needle coke tail gas under anaerobic positive pressure.
Background
Needle coke is a high-quality carbon material and is named because of a slender needle-shaped structure after being crushed. The needle coke has metallic luster in appearance, layered structure inside, and good orientation, electric conductivity and heat conductivity, so that it is the main material for making superhigh power electrode for steel making.
In the pretreatment process of the coal-based needle coke, a large amount of non-methane aromatic hydrocarbon contained in oil products stored in an oil depot and tail gas generated in the process is required to be recovered, absolute safety and stability in the whole recovery process are required to be maintained, and explosive mixed gas cannot be generated in the whole process.
The traditional recovery methods comprise a micro-negative pressure anaerobic recovery treatment method and a micro-negative pressure large-flow air distribution recovery treatment method.
The micro-negative pressure oxygen-insulated recovery processing method is mainly applied to recovering tail gas diffused by each oil groove into a negative pressure gas pipeline in the field of gas purification, the oil tanks are required to be completely sealed and cannot leak, the oxygen content in tail gas is generally required to be less than 2 percent, the sealed oil tanks are operated under negative pressure, if a small amount of leakage occurs, the sealed oil tanks are not easy to find, only when the oxygen content in the tail gas exceeds a limit value, the sealed oil tanks are forced to stop to carry out ventilation for positive pressure check, whether leakage points exist or not is found, and the oil tank which needs to recover the negative pressure is cut off the negative pressure system when the oil tank works, and then put into the negative pressure system after the work is finished, the operation is very troublesome, once the oxygen detector fails, the oxygen content is not easy to be found when exceeding the standard, and the ignition and explosion accidents are easy to occur, at the same time, the recovery pipeline of the oil tank is often easy to be blocked, and if the oil tank is not found to be shriveled in time, the risk of the oil tank is caused.
The method for treating the tail gas recovered by micro-negative-pressure large-flow air distribution generally applies a negative-pressure gas pipeline system which can not be recovered nearby, can only carry out open recovery on the tail gas of each oil tank by using a draught fan, and generally controls the content of combustible gas to be below one fourth of the lower explosion limit by distributing excessive air into the tail gas in a large amount, so that the problem that explosion accidents occur easily once the distributed air is reduced or the content of the generated combustible gas is increased, and a large amount of energy is consumed when the tail gas with large air distribution is burnt by a burning furnace is solved.
Therefore, it is necessary to find a more reasonable method for recovering and treating tail gas.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a system and a method for recovering coal-based needle coke tail gas under anaerobic positive pressure, which are used for recovering oil groove tail gas under anaerobic positive pressure, have high safety and reliability and meet the environmental protection requirements of carbon neutralization and the future.
In order to achieve the purpose, the invention adopts the following technical scheme:
a system for recycling tail gas of coal-based needle coke under anaerobic positive pressure comprises an oil groove and a flue gas scrubber; the top of the oil groove is provided with a relief valve, a single-breath valve, a self-supporting regulating valve group, a breather valve and an electronic pressure gauge; the oil tank is connected with an oil gas main pipeline of tail gas to be recovered, the oil tank is connected with a flue gas scrubber pipeline, and the oil tank is connected with a nitrogen pipeline; the flue gas scrubber is provided with a bleeding pipe, and a flue gas emergency bleeding valve is arranged on the bleeding pipe; the flue gas scrubber is connected with a negative pressure gas pipeline or the flue gas scrubber is connected with an incinerator pipeline, and flue gas emergency cut-off valves are arranged on the connected pipelines.
And a first communicating valve and a suction regulating valve are sequentially arranged on a pipeline connecting the smoke scrubber and the negative pressure gas pipeline.
The pipeline that the flue gas scrubber and negative pressure gas pipeline link to each other links to each other with first nitrogen gas pipeline, is equipped with automatic nitrogen supplement valve on the first nitrogen gas pipeline.
And a second cross-flow valve, a draught fan and a flame arrester are sequentially arranged on a pipeline connecting the flue gas scrubber and the incinerator.
And a pipeline connecting the flue gas scrubber and the incinerator is connected with a second nitrogen pipeline, and a nitrogen supplementing quick-opening valve is arranged on the second nitrogen pipeline.
A method for recycling tail gas of coal-based needle coke in an anaerobic positive pressure mode comprises the following steps:
1) connecting an oil gas main pipeline of tail gas to be recovered with an oil groove tail gas pipeline of the tail gas to be recovered, and introducing nitrogen into an oil groove; all pipelines are heated by steam, the temperature is kept between 100 and 180 ℃, the pressure of an oil groove is-0.5 to 3.0KPa, the working pressure of a single-breath valve is 0 to 2KPa, the working pressure of a breather valve is-0.5 to 1.5KP, the working pressure of a release valve is 1.8 to 3KP, and the self-standing regulating valve group is connected with a nitrogen pipeline and has the pressure of 0 to 3 KPa.
2) Washing heavy components of tail gas in the oil gas of the tail gas to be recovered by a solvent through a flue gas washer; the pressure of the flue gas washer is 0-3 KPa, and the solvent is any one or mixture of washing oil, kerosene and light diesel oil. The pressure of the flue gas scrubber is automatically regulated and controlled by a suction regulating valve or controlled by a nitrogen supplement regulating valve.
3) Introducing nitrogen into a pipeline connecting the flue gas scrubber and the negative pressure gas pipeline or a pipeline connecting the flue gas scrubber and the incinerator; the tail gas which is washed to remove heavy components is controlled by a suction force adjusting valve to control pressure and then is recycled by a negative pressure gas pipeline, or the tail gas is controlled by a nitrogen supplement adjusting valve to control pressure and then is sent to an incinerator by a draught fan to be burnt as air distribution.
The pressure of the negative pressure gas pipeline for negative pressure gas recovery is regulated by a suction regulating valve, and the pressure before the valve is controlled to be-100-3000 Pa; if the pressure behind the valve is less than 0Pa, the smoke emergency cut-off valve is automatically closed, and the smoke emergency relief valve is opened for relief.
Compared with the prior art, the invention has the beneficial effects that:
1) both the oil tank and the flue gas scrubber are under positive pressure, and are under positive pressure recovery; the positive pressure can reduce the volatilization of non-methane aromatic hydrocarbons in various oil products.
2) According to the invention, nitrogen is introduced into the oil tank and the conveying pipeline, and the protection of the nitrogen can realize anaerobic recovery, thereby achieving intrinsically safe recovery.
3) The top of the oil tank is provided with a relief valve, a single-breathing valve, a self-supporting regulating valve group, a breathing valve and an electronic pressure gauge, and the oil tank is provided with various safety accessories so as to ensure that the oil tank cannot be deflated or expanded under abnormal conditions.
4) The positive pressure recovery is easier to find when leakage occurs than the method for recovering tail gas under negative pressure, thereby avoiding the occurrence of malignant accidents.
5) The tail gas of the invention is finally led to a negative pressure gas pipeline or an incinerator, and compared with the tail gas which is recycled in an open way, the tail gas recovery system has smaller gas quantity and is more energy-saving.
The invention provides a method for recovering coal-based needle coke tail gas in an anaerobic positive pressure manner, which can carry out anaerobic positive pressure recovery on non-methane aromatic hydrocarbon-containing tail gas generated by various process devices such as oil tanks and the like.
Drawings
FIG. 1 is a schematic structural view and a schematic process diagram of example 1 of the present invention;
fig. 2 is a schematic structural diagram and a schematic process diagram of embodiment 2 of the present invention.
In the figure: 1-oil groove 2-relief valve 3-single-breath valve 4-self-standing regulating valve group 5-breath valve 6-electronic pressure gauge 7-suction regulating valve 8-flue gas scrubber 9-flue gas emergency relief valve 10-automatic nitrogen supplement valve 11-flue gas emergency cut-off valve 12-negative pressure gas pipeline 13-first cross valve 14-nitrogen supplement regulating valve 15-second cross valve 16-induced draft fan 17-flame arrester 18-nitrogen supplement quick-opening 19-incinerator
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
[ example 1 ]
As shown in fig. 1, the system for recovering coal-based needle coke tail gas by using anaerobic positive pressure comprises an oil groove 1, a discharge valve 2, a single-breath valve 3, a breather valve 5, a self-standing regulating valve group 4, an electronic pressure gauge 6, a suction regulating valve 7, a flue gas scrubber 8, a flue gas emergency relief valve 9, an automatic nitrogen supplement valve 10, a flue gas emergency cut-off valve 11, a negative pressure gas pipeline 12 and a first alternating-current valve 13.
The top of the oil tank 1 is provided with a relief valve 2, a single-breath valve 3, a breather valve 5, a self-supporting regulating valve group 4 and an electronic pressure gauge 6. The oil groove 1 is connected with an oil main pipeline of tail gas to be recovered, and the oil groove 1 is connected with a flue gas scrubber 8 pipeline. The flue gas scrubber 8 is provided with a diffusing pipe, and the diffusing pipe is provided with a flue gas emergency diffusing valve 9. The self-standing regulating valve group 4 is connected with a nitrogen pipeline.
The flue gas scrubber 8 is connected with a negative pressure gas pipeline 12 through a pipeline, a first cross valve 13, a suction regulating valve 7 and a flue gas emergency cut-off valve 11 are sequentially arranged on the connected pipeline, the rear part of the flue gas emergency cut-off valve 11 is connected with a nitrogen pipeline, and an automatic nitrogen supplementing valve 10 is arranged on the nitrogen pipeline.
A method for recycling tail gas of coal-based needle coke in an anaerobic positive pressure mode comprises the following steps:
1) the oil gas main pipeline of waiting to retrieve tail gas links to each other with the 1 tail gas pipeline of oil groove of waiting to retrieve tail gas, opens self-supporting adjusting valve group 4, lets in nitrogen gas in to oil groove 1.
All pipelines are heated by steam, the temperature is kept between 100 and 180 ℃, the pressure of an oil groove 1 is-0.5 to 3.0KPa, the working pressure of a single-breath valve 3 is 0 to 2KPa, the working pressure of a breath valve 5 is-0.5 to 1.5KP, the working pressure of a release valve 2 is 1.8 to 3KP, a self-supporting regulating valve group 4 is connected with a nitrogen pipeline, and the pressure is 0 to 3 KPa.
2) And (4) washing heavy components of the tail gas in the oil gas of the tail gas to be recovered by a solvent through a flue gas washer 8. The pressure of the flue gas washer is 0-3 KPa, and the solvent is any one or mixture of washing oil, kerosene and light diesel oil. The pressure of the flue gas scrubber 8 is controlled by a nitrogen supplement regulating valve 14.
3) Opening a nitrogen supplement regulating valve 14 to introduce nitrogen into a pipeline connecting the flue gas scrubber 8 and the incinerator 19;
[ example 2 ]
As shown in fig. 2, the system for recovering coal-based needle coke tail gas by anaerobic positive pressure comprises an oil groove 1, a relief valve 2, a single-breath valve 3, a breather valve 5, a self-standing regulating valve group 4, an electronic pressure gauge 6, a flue gas scrubber 8, a flue gas emergency relief valve 9, a nitrogen supplement quick-opening valve 18, a flue gas emergency cut-off valve 11, a nitrogen supplement regulating valve 14, a second alternating-flow valve 15, an induced draft fan 16, a flame arrester 17 and an incinerator 19.
The top of the oil tank 1 is provided with a relief valve 2, a single-breath valve 3, a breather valve 5, a self-supporting regulating valve group 4 and an electronic pressure gauge 6. The oil groove 1 is connected with an oil main pipeline of tail gas to be recovered, and the oil groove 1 is connected with a flue gas scrubber 8 pipeline. The flue gas scrubber 8 is provided with a diffusing pipe, and the diffusing pipe is provided with a flue gas emergency diffusing valve 9. The self-standing regulating valve group 4 is connected with a nitrogen pipeline.
The flue gas scrubber 8 is connected with a nitrogen pipeline, and a nitrogen supplementing regulating valve 14 is arranged on the nitrogen pipeline. The flue gas scrubber 8 is connected with the incinerator 19 through a pipeline, a second cross valve 15, an induced draft fan 16, a flame arrester 17 and a flue gas emergency cut-off valve 11 are sequentially arranged on the connected pipeline, the rear flue gas emergency cut-off valve 11 is connected with a nitrogen pipeline, and a nitrogen supplementing quick-opening valve 18 is arranged on the nitrogen pipeline.
1) The oil gas main pipeline of waiting to retrieve tail gas links to each other with the oil groove 1 tail gas pipeline of waiting to retrieve tail gas, opens self-supporting adjusting valve group 4, lets in nitrogen gas in to oil groove 1.
All pipelines are heated by steam, the temperature is kept between 100 and 180 ℃, the pressure of an oil groove 1 is-0.5 to 3.0KPa, the working pressure of a single-breath valve 3 is 0 to 2KPa, the working pressure of a breath valve 5 is-0.5 to 1.5KP, the working pressure of a release valve 2 is 1.8 to 3KP, a self-supporting regulating valve group 4 is connected with a nitrogen pipeline, and the pressure is 0 to 3 KPa.
2) And (3) washing heavy components of the tail gas in the oil gas of the tail gas to be recovered by a solvent through a flue gas washer 8. The pressure of the flue gas scrubber is 0-3 KPa, and the solvent is any one or mixture of washing oil, kerosene and light diesel oil. The pressure of the flue gas scrubber 8 is automatically regulated and controlled by the suction regulating valve 7.
3) Opening an automatic nitrogen supplementing valve 10 to introduce nitrogen into a pipeline connecting the flue gas scrubber 8 and the negative pressure gas pipeline 12; the pressure of the tail gas after being washed and removed with heavy components is controlled by a nitrogen supplement regulating valve 14, and then the tail gas is sent to an incinerator 19 by an induced draft fan 16 to be combusted when air distribution is carried out.
The oil tank 1 and the flue gas scrubber 8 are both in positive pressure and are in positive pressure recovery; the positive pressure can reduce the volatilization of non-methane aromatic hydrocarbons in various oil products. According to the invention, nitrogen is introduced into the oil tank 1 and the conveying pipeline, and positive-pressure oxygen-insulated recovery can be realized under the protection of the nitrogen, so that intrinsically safe recovery is achieved. The top of the oil tank 1 is provided with a relief valve 2, a single-breathing valve 3, a self-supporting regulating valve group 4, a breathing valve 5 and an electronic pressure gauge 6, and the oil tank 1 is provided with various safety accessories to ensure that the oil tank 1 cannot be deflated or expanded under abnormal conditions. The invention relates to positive pressure recovery, which is easier to find when leakage occurs than a method for recovering tail gas under negative pressure, thereby avoiding the occurrence of malignant accidents. The tail gas of the invention is finally led to the negative pressure gas pipeline 12 or the incinerator 19, and compared with the open recovered tail gas, the gas quantity is smaller and the energy is more saved.
The invention provides a method for recycling tail gas of coal-based needle coke in an anaerobic positive pressure manner, which can carry out anaerobic positive pressure recycling on tail gas containing non-methane aromatic hydrocarbon generated by process devices such as various oil tanks and the like.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and their concepts of the present invention within the technical scope of the present invention. The methods used in the above examples are conventional methods unless otherwise specified.

Claims (10)

1. A system for recovering coal-based needle coke tail gas under anaerobic positive pressure is characterized in that: comprises an oil groove and a flue gas scrubber; the top of the oil groove is provided with a relief valve, a single-breath valve, a self-supporting regulating valve group, a breather valve and an electronic pressure gauge; the oil tank is connected with an oil gas main pipeline of tail gas to be recovered, the oil tank is connected with a flue gas scrubber pipeline, and the oil tank is connected with a nitrogen pipeline; the flue gas scrubber is provided with a bleeding pipe, and a flue gas emergency bleeding valve is arranged on the bleeding pipe; the flue gas scrubber is connected with a negative pressure gas pipeline or the flue gas scrubber is connected with an incinerator pipeline, and flue gas emergency cut-off valves are arranged on the connected pipelines.
2. The system for anaerobic positive pressure recovery of coal-based needle coke tail gas according to claim 1, characterized in that: and a first cross-flow valve and a suction adjusting valve are sequentially arranged on a pipeline connecting the flue gas scrubber and the negative pressure gas pipeline.
3. The system for anaerobic positive pressure recovery of coal-based needle coke tail gas according to claim 1, characterized in that: the pipeline that the flue gas scrubber and negative pressure gas pipeline link to each other links to each other with first nitrogen gas pipeline, is equipped with automatic nitrogen supplement valve on the first nitrogen gas pipeline.
4. The system for anaerobic positive pressure recovery of coal-based needle coke tail gas according to claim 1, characterized in that: and a second cross-flow valve, a draught fan and a flame arrester are sequentially arranged on a pipeline connecting the flue gas scrubber and the incinerator.
5. The system for anaerobic positive pressure recovery of coal-based needle coke tail gas according to claim 1, characterized in that: and a pipeline connecting the flue gas scrubber and the incinerator is connected with a second nitrogen pipeline, and a nitrogen supplementing quick-opening valve is arranged on the second nitrogen pipeline.
6. The method for recycling the coal-based needle coke tail gas under the anaerobic positive pressure based on the system for recycling the coal-based needle coke tail gas under the anaerobic positive pressure as claimed in claim 1, 2, 3, 4 or 5 is characterized by comprising the following steps:
1) connecting an oil gas main pipeline of tail gas to be recovered with an oil groove tail gas pipeline of the tail gas to be recovered, and introducing nitrogen into an oil groove;
2) washing heavy components of the tail gas in the oil groove of the tail gas to be recovered by a solvent through a flue gas washer; the pressure of the flue gas scrubber is 0-3 KPa,
3) introducing nitrogen into a pipeline connecting the flue gas scrubber and the negative pressure gas pipeline or a pipeline connecting the flue gas scrubber and the incinerator; the tail gas which is washed to remove heavy components is controlled by a suction force adjusting valve to control pressure and then is recycled by a negative pressure gas pipeline, or the tail gas is controlled by a nitrogen supplement adjusting valve to control pressure and then is sent to the incinerator by a draught fan to be used as air distribution for air distribution and combustion.
7. The method for recycling coal-based needle coke tail gas in an anaerobic positive pressure mode is characterized in that in the step 1), all pipelines are subjected to heat tracing through steam, the temperature is kept between 100 and 180 ℃, the pressure of a storage tank is-0.5 to 3.0KPa, the working pressure of a single-breathing valve is 0 to 2KPa, the working pressure of a breathing valve is-0.5 to 1.5KP, the working pressure of a discharge valve is 1.8 to 3KP, a self-standing adjusting valve group is connected with a nitrogen pipeline, and the pressure is 0 to 3 KPa.
8. The method for recycling the coal-based needle coke tail gas under the anaerobic positive pressure is characterized in that the solvent in the step 2) is any one or mixture of a plurality of washing oil, kerosene and light diesel oil.
9. The method for recycling the coal-based needle coke tail gas in the anaerobic positive pressure mode is characterized in that the pressure of the flue gas scrubber in the step 2) is automatically adjusted and controlled by a suction adjusting valve or controlled by a nitrogen supplementing adjusting valve.
10. The method for recycling the coal-based needle coke tail gas in an anaerobic and positive pressure manner is characterized in that the pressure of the negative pressure coal gas recycling of the negative pressure coal gas pipeline in the step 3) is regulated by a suction regulating valve, and the pressure before the valve is controlled to be-100-3000 Pa; if the pressure behind the valve is smaller than 0Pa, the smoke emergency cut-off valve is automatically closed, and the smoke emergency release valve is opened for releasing.
CN202210895034.6A 2022-07-28 2022-07-28 System and method for anaerobic positive pressure recovery of coal-based needle coke tail gas Pending CN115069070A (en)

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