CN111744329A - Treatment device and treatment process for long-distance long-term stable transportation of naphthalene-containing VOCs gas - Google Patents
Treatment device and treatment process for long-distance long-term stable transportation of naphthalene-containing VOCs gas Download PDFInfo
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- CN111744329A CN111744329A CN201910237834.7A CN201910237834A CN111744329A CN 111744329 A CN111744329 A CN 111744329A CN 201910237834 A CN201910237834 A CN 201910237834A CN 111744329 A CN111744329 A CN 111744329A
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- 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
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- 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
- B01D53/1431—Pretreatment by other processes
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- 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
- B01D53/1487—Removing organic compounds
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention discloses a treatment device and a treatment process for long-distance and long-term stable transportation of naphthalene-containing VOCs gas, wherein the treatment device comprises a pretreatment device which is arranged on a naphthalene-containing VOCs gas transportation pipeline in parallel, the upper part of the pretreatment device is connected with a benzene storage container through a nitrogen sealing pressure balance system, the lower part of the pretreatment device is connected with a naphthalene-containing VOCs gas transportation pipeline led from a VOCs gas collection point, and a wash oil spraying system is arranged in the pretreatment device.
Description
Technical Field
The invention relates to the technical field of coking VOCs (volatile organic compounds) gas treatment, in particular to a treatment device and a treatment process capable of stably realizing long-distance and long-term stable transportation of naphthalene-containing VOCs gas generated in a coking crude benzene distillation area.
Background
The VOCs gas generated in the distillation area of the coked crude benzene is a toxic and harmful organic compound gas containing naphthalene substances and is volatile at normal temperature and normal pressure, and the organic components of the VOCs gas contain 1-2% of naphthalene (mass fraction) in the distilled light oil (gas phase) besides a large amount of benzene compounds such as benzene, toluene, xylene and the like. Since the gas of VOCs generated in the distillation area of crude benzene has strong toxicity and certain carcinogenicity, the emission concentration of VOCs is strictly limited in relevant emission standards of countries and places.
According to the requirements of the emission standard of pollutants in the coking chemical industry (GB16171-<6mg/m3Non-methane total hydrocarbons<80mg/m3In areas with small environmental capacity, fragile ecological environment, easy occurrence of serious atmospheric environmental pollution problems and need of special protection measures, the special emission limit of atmospheric pollutants specified in table 6 in the standard is implemented, wherein table 6 requires that the concentration of benzene series substances meets the requirement of table 6<6mg/m3Non-methane total hydrocarbons<50mg/m3。
According to the requirements of the emission standard of pollutants for the coking chemical industry (GB16171-2012) in term 4.2.7, "the production process and equipment for producing the atmospheric pollutants must establish a local or integral gas collection system and purification treatment equipment to reach the emission standard".
At present, the treatment of VOCs gas containing naphthalene generated in a benzene storage tank in a coking crude benzene distillation equipment area is carried out by adopting a process of 'integral gas collection + coal gas negative pressure pipe network sent to coking drum cooling equipment'. FIG. 1 is a schematic view of a process for treating a naphthalene-containing VOCs gas in the prior art; in the process, a benzene storage tank 3 in a crude benzene distillation area is connected through a naphthalene-containing VOCs gas conveying pipeline 2, and the naphthalene-containing VOCs gas can be conveyed to a coal gas negative pressure pipe network of a coking drum cooling device by arranging a nitrogen sealing and pressure balancing system 1 on the benzene storage tank 3 and utilizing the system pressure difference between the benzene storage tank 3 and the coal gas negative pressure pipe network 4 through a coal gas blower 5. Under normal conditions, zero emission can be realized, the pollution to the environment is reduced, and the requirements of coking chemical industrial pollutants are metEmission standard (GB16171-2012) air pollutant special emission limit requirement (benzene series substances) specified in Table 6<6mg/m3Non-methane total hydrocarbons<50mg/m3). The VOCs gas generated by the benzene storage tank in the crude benzene distillation area contains organic naphthalene, the melting point of naphthalene is 80.5 ℃, and in the process of VOCs gas conveying (especially long-distance long-term conveying), naphthalene is easy to crystallize and separate out along with the reduction of gas temperature to gradually block a pipeline, so that the VOCs gas cannot be stably conveyed for a long distance and a long time, the escape amount of the VOCs gas in the benzene storage tank in the crude benzene distillation area is increased to the environment, and the up-to-standard discharge cannot be realized.
Along with the further strictness of the emission standard, the existing treatment process can not meet the requirements, a novel naphthalene-containing VOCs gas treatment process is urgently needed to be developed, the problem that the naphthalene crystals block pipelines is solved, the VOCs gas is normally conveyed to a coal gas negative pressure pipe network for a long time in a long distance, and the zero emission of the VOCs gas in a crude benzene distillation area is further stably realized.
Therefore, the research on the long-distance and long-term stable transportation process of the naphthalene-containing VOCs gas in the distillation area of the coking crude benzene is deeply developed, and a targeted treatment scheme is formulated, so that the method has important significance on environmental protection and sustainability of enterprises.
Disclosure of Invention
The invention aims to solve the technical problem of providing a treatment device which can not cause pipeline blockage and realize stable conveying in the long-distance long-term conveying process of the naphthalene-containing VOCs gas.
The technical problem to be solved can be implemented by the following technical scheme.
The utility model provides a gaseous long-term stable processing apparatus who carries of long distance of naphthalene VOCs, includes that a parallel sets up the pre treatment device on the gaseous conveying line of naphthalene VOCs, the upper portion of pre treatment device is connected with benzene storage container through nitrogen gas seal pressure balance system, the gaseous conveying line of naphthalene VOCs who draws from VOCs gas collection point is connected to the lower part of pre treatment device, the inside wash oil spraying system that is provided with of pre treatment device.
As a further improvement of the technical scheme, the device also comprises a device capable of preheating the washing oil.
As a further improvement of the technical scheme, the wash oil of the wash oil spraying system is introduced from a wash oil recycling system, and the wash oil recycling system at least comprises a new wash oil supplementing pipeline and a naphthalene-containing wash oil discharging pipeline.
As a further improvement of the technical scheme, the pretreatment equipment is provided with an internal liquid level adjusting device.
Another technical problem to be solved by the present invention is to provide a treatment process for treating a gas containing VOCs with the above treatment apparatus, the process at least comprising the following steps:
and the naphthalene-containing VOCs gas flows from the bottom to the top of the pretreatment equipment under the driving of negative pressure of the pipeline, and the wash oil sprayed from the top of the pretreatment equipment selectively absorbs naphthalene in the VOCs gas.
As a preferred embodiment of the treatment process, the treatment process further comprises the step of indirectly or directly heating the wash oil, wherein the heating condition is that the gas collection temperature of the VOCs gas is 2-3 ℃ higher than that of the VOCs gas; and the ratio of the oil washing amount to the VOCs gas generation amount in the pretreatment equipment is controlled to be not less than 2L/m3The step (2).
As a further improvement of the technical proposal, the method also comprises the step of controlling the washing oil level at the bottom of the pretreatment device to be 40-60% (preferably 50%).
As one of the preferred embodiments of the present invention, indirect heating conditions are adopted, the heating medium is low-pressure saturated steam, and the steam pressure is not less than 7 kg.
Compared with the prior art, the treatment device and the treatment process adopting the technical scheme have the advantages that the conveying pipeline is not easy to block, is more smooth and is stable in conveying.
Drawings
FIG. 1 is a schematic view of a conventional treatment process for VOCs containing naphthalene.
FIG. 2 is a schematic diagram of the process flow of the invention for pretreating the gas containing the VOCs in the distillation zone of the coking crude benzene.
In the figure, 1 is a nitrogen sealing pressure balance system, 2 is a naphthalene-containing VOCs gas conveying pipeline, 3 is a benzene storage tank, 4 is a gas negative pressure pipe network, 5 is a gas blower, 6 is a circulating wash oil indirect heater, 7 is a liquid level automatic regulator, 8 is naphthalene-containing wash oil, 9 is a circulating wash oil pipeline, 10 is pretreatment equipment, 11 is a circulating wash oil pump, 12 is a new wash oil supplementing pipeline, and 13 is a VOCs gas collection point.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
In order to overcome the problems in the prior treatment process of the naphthalene-containing VOCs gas, the invention aims to provide a novel treatment process and a novel treatment device for effectively solving the problem that the naphthalene-containing VOCs gas in a benzene storage tank in a coking crude benzene distillation area is stably conveyed to a coal gas negative pressure pipe network for a long time, and the novel treatment process changes the original treatment mode and eliminates the influence of blocking a VOCs gas conveying pipeline by naphthalene crystals.
The technology adopts a pretreatment mode to remove the naphthalene in the VOCs gas generated in the coking crude benzene distillation area in advance, the naphthalene content in the pretreated VOCs gas can be greatly reduced, the VOCs gas after naphthalene removal is connected into an original waste gas pipeline and conveyed to a coal gas negative pressure pipeline network, the problem that the pipeline is blocked by naphthalene precipitation crystallization in the VOCs gas conveying process can be effectively solved, and the novel technology is applied to coking VOCs gas treatment containing naphthalene for the first time.
The novel treatment process for long-distance long-term stable transportation of the naphthalene-containing VOCs gas, provided by the invention, comprises naphthalene-containing VOCs gas pretreatment equipment, and the specific flow is shown in an attached figure 2. The collected gas containing the VOCs is firstly sent to the pretreatment equipment 10, the naphthalene in the VOCs gas is removed by using the indirectly heated circulating wash oil, the naphthalene-removing VOCs gas is connected to an original waste gas pipeline through the nitrogen sealing and pressure balancing system 1 and then is conveyed to the coal gas negative pressure pipe network 4, and zero emission of the VOCs gas is realized.
The specific implementation mode of the naphthalene-containing VOCs gas pretreatment process is as follows:
1. introducing the VOCs gas containing naphthalene into the bottom of the pretreatment equipment 10 at the position which is 125 meters away from the gas collection point 13 of the original VOCs gas conveying pipeline 2 through a pipeline connected with the benzene storage tank 3;
2. in the pretreatment equipment, the gas containing the VOCs containing naphthalene flows from the bottom of the equipment to the top of the equipment under the drive of negative pressure of a pipeline, the washing oil is sprayed from the top of the pretreatment equipment 10, so that the gas containing the VOCs containing naphthalene is in reverse contact with the washing oil, and the washing oil can selectively absorb the naphthalene in the VOCs gas by utilizing the principle of similarity and compatibility of substances;
3. in order to further enhance the naphthalene removal effect, the circulating washing oil is indirectly heated by a circulating washing oil indirect heater 6, the heating medium is low-pressure saturated steam, the steam pressure is 7kg, the temperature of the circulating washing oil at the outlet of the heater is controlled to be 38-40 ℃ (2-3 ℃ higher than the gas collection temperature of VOCs gas), and the liquid-gas ratio (the ratio of the circulating washing oil to the VOCs gas generation amount) in pretreatment equipment is controlled to be larger than or equal to 2L/m3The liquid level of the washing oil at the bottom of the pretreatment equipment is controlled at 50 percent; for this purpose, an automatic pretreatment device level regulator 7 is used.
4. Replacing the circulating wash oil used in the pretreatment process by periodically supplementing a proper amount of new wash oil, discharging the replaced wash oil into a heavy oil tank through a circulating wash oil pump 11 and a circulating wash oil pipeline 9 of the pretreatment equipment, and sending the wash oil 8 containing naphthalene to the chemical deep processing treatment;
5. the purified (naphthalene-removed) VOCs gas is connected into the original waste gas pipeline again through the nitrogen sealing and pressure balancing system 1 (the distance between the connection point and the gas collection point 13 is 165-170 m).
In addition, the number 5 in the figure is a gas blower, and the number 12 is a new oil washing supplementing pipeline.
The method comprises the steps of firstly sending collected naphthalene-containing VOCs gas to pretreatment equipment, removing naphthalene in the VOCs gas by using washing oil, introducing the naphthalene-removing VOCs gas into an original waste gas pipeline through a nitrogen sealing and pressure balancing system, conveying the naphthalene-removing VOCs gas to a coal gas negative pressure pipeline network, continuously pumping the washing oil absorbed with naphthalene to a heavy asphalt oil tank in a crude benzene distillation area through automatic liquid level adjusting equipment of the pretreatment equipment, and then sending the washing oil to chemical deep processing treatment. In order to ensure the naphthalene removal effect, new washing oil is continuously supplemented and the circulating washing oil is indirectly heated so as to maintain the absorption capacity of the circulating washing oil on naphthalene. After the gas containing the naphthalene VOCs in the crude benzene distillation area is pretreated, the continuous purification and long-distance and long-term stable conveying of the gas containing the naphthalene VOCs in the coking crude benzene distillation area to a coal gas negative pressure pipe network can be realized, and the zero emission of the VOCs gas is stably realized.
The process is suitable for long-distance and long-term stable transportation of the naphthalene-containing VOCs gas in the distillation area of the coking crude benzene, and the comparison conditions before and after treatment are shown in the table.
Comparison of conditions before and after treatment of naphthalene-containing VOCs gas in coking crude benzene distillation area
Claims (9)
1. The utility model provides a gaseous long-term stable processing apparatus who carries of long distance of naphthalene-containing VOCs, its characterized in that includes that a parallelly connected sets up the pre treatment device on containing naphthalene-containing VOCs gas transmission pipeline, pre treatment device's upper portion is connected with benzene storage container through nitrogen gas seal pressure balance system, pre treatment device's sub-unit connection draws from the gaseous transmission line of naphthalene-containing VOCs of VOCs gas collection point, pre treatment device inside is provided with the wash oil spraying system.
2. The apparatus of claim 1, further comprising a means for preheating the wash oil.
3. The apparatus according to claim 1, wherein the wash oil of the wash oil spraying system is introduced from a wash oil recycling system, and the wash oil recycling system at least comprises a fresh wash oil supplement pipeline and a naphthalene-containing wash oil discharge pipeline.
4. The apparatus of claim 1, wherein the pre-treatment device comprises an internal level control device.
5. A process for treating a naphthalene containing VOCs gas using the treatment apparatus of any one of claims 1 to 4, comprising at least the steps of:
and the naphthalene-containing VOCs gas flows from the bottom to the top of the pretreatment equipment under the driving of negative pressure of the pipeline, and the wash oil sprayed from the top of the pretreatment equipment selectively absorbs naphthalene in the VOCs gas.
6. The treatment process according to claim 5, further comprising the step of indirectly or directly heating the wash oil under conditions of 2 to 3 ℃ higher than the gas collection temperature of the VOCs gas;
and the ratio of the oil washing amount to the VOCs gas generation amount in the pretreatment equipment is controlled to be not less than 2L/m3The step (2).
7. The process of claim 6, further comprising the step of controlling the level of wash oil at the bottom of the pretreatment apparatus to be 40-60%.
8. The process according to claim 6, wherein the indirect heating condition is adopted, the heating medium is low-pressure saturated steam, and the steam pressure is not less than 7 kg.
9. The process of claim 7, wherein the level of wash oil at the bottom of the pretreatment unit is controlled at 50%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910237834.7A CN111744329A (en) | 2019-03-27 | 2019-03-27 | Treatment device and treatment process for long-distance long-term stable transportation of naphthalene-containing VOCs gas |
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| CN201910237834.7A CN111744329A (en) | 2019-03-27 | 2019-03-27 | Treatment device and treatment process for long-distance long-term stable transportation of naphthalene-containing VOCs gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115069070A (en) * | 2022-07-28 | 2022-09-20 | 鞍钢化学科技有限公司 | System and method for anaerobic positive pressure recovery of coal-based needle coke tail gas |
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| US4001347A (en) * | 1974-03-07 | 1977-01-04 | Koppers Company, Inc. | Method for the removal of naphthalene from coke oven gas |
| JPS58207932A (en) * | 1982-05-31 | 1983-12-03 | Mitsubishi Heavy Ind Ltd | Method for preventing deposition of crystalline hydrocarbon in gas treating system |
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| CN203569056U (en) * | 2013-10-08 | 2014-04-30 | 马钢(集团)控股有限公司 | Device for eliminating naphthalene from coke oven gas with washing oil |
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| CN109173678A (en) * | 2018-11-09 | 2019-01-11 | 山东环达环保科技有限公司 | Coke-oven plant's VOC exhaust gas treating method and device |
| CN208449017U (en) * | 2018-06-15 | 2019-02-01 | 朝阳黑猫伍兴岐炭黑有限责任公司 | A kind of VOC recycling reprocessing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB570396A (en) * | 1943-04-08 | 1945-07-05 | Thomas Alborn Clapham | An improved method and apparatus for use in the manufacture and purification of coal gas |
| US4001347A (en) * | 1974-03-07 | 1977-01-04 | Koppers Company, Inc. | Method for the removal of naphthalene from coke oven gas |
| JPS58207932A (en) * | 1982-05-31 | 1983-12-03 | Mitsubishi Heavy Ind Ltd | Method for preventing deposition of crystalline hydrocarbon in gas treating system |
| CN101879398A (en) * | 2010-06-29 | 2010-11-10 | 南京钢铁股份有限公司 | Recovery process of coking crude benzene dispersing gas and device thereof |
| CN203569056U (en) * | 2013-10-08 | 2014-04-30 | 马钢(集团)控股有限公司 | Device for eliminating naphthalene from coke oven gas with washing oil |
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| CN207237638U (en) * | 2017-09-21 | 2018-04-17 | 山西星宇舟焦化工程设计有限公司 | Air storing duct VOCs master gas devices |
| CN108525460A (en) * | 2018-03-09 | 2018-09-14 | 庞泰环保工程（江苏）有限公司 | A kind of industrial tail gas mixed gas recovery method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115069070A (en) * | 2022-07-28 | 2022-09-20 | 鞍钢化学科技有限公司 | System and method for anaerobic positive pressure recovery of coal-based needle coke tail gas |
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Application publication date: 20201009 |