CN114887443A - Oil gas condensation recovery combined RTO petrochemical tank area waste gas treatment system and process - Google Patents

Oil gas condensation recovery combined RTO petrochemical tank area waste gas treatment system and process Download PDF

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Publication number
CN114887443A
CN114887443A CN202210573057.5A CN202210573057A CN114887443A CN 114887443 A CN114887443 A CN 114887443A CN 202210573057 A CN202210573057 A CN 202210573057A CN 114887443 A CN114887443 A CN 114887443A
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rto
unit
waste gas
gas
oil
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王凯
郑庆华
王康
李伟刚
蔡大顺
钟友平
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Shanghai Lanbao Environmental Protection Technology Co ltd
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Shanghai Lanbao Environmental Protection Technology Co ltd
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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
    • B01D53/002—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 condensation
    • 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
    • B01D53/04—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 with stationary adsorbents
    • 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
    • F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses a petrochemical tank area waste gas treatment system and process combining oil gas condensation recovery with RTO (regenerative thermal oxidizer), wherein the system comprises an oil gas desulfurization unit, a double-channel oil gas condensation recovery unit, an active carbon adsorption unit and an RTO high-temperature thermal oxidation treatment unit which are sequentially communicated through a pipeline, and specifically comprises a desulfurization washing tower, a refrigeration unit, a cold box unit, an active carbon tank, a vacuum pump, an RTO incinerator, a flame arrester, a fan and the like, waste gas in a petrochemical tank area sequentially passes through oil gas desulfurization treatment, oil gas double-channel condensation recovery, waste gas active carbon adsorption and vacuum desorption and RTO high-temperature thermal oxidation decomposition, and the discharge concentration of VOCs (volatile organic chemicals) in the waste gas is less than 60mg/m 3 The discharge reaches the standard. The efficiency of treating the waste gas in the petrochemical tank area by adopting the combined process of 'condensing oil gas recovery + RTO' is over 99 percent, the operation cost of the system is reduced, and the invention is environment-friendlyThe service life of the system is prolonged to the maximum extent while the standard is stably reached.

Description

Oil gas condensation recovery combined RTO petrochemical tank area waste gas treatment system and process
Technical Field
The invention belongs to the field of petrochemical industry, and particularly relates to a petrochemical tank area waste gas treatment system and process combining oil gas condensation and recovery with RTO.
Background
In practical engineering application, the concentration of the discharged VOCs in the petrochemical oil storage tank area is high, the discharge is discontinuous, and for the waste gas treatment of the discharged gas in the petrochemical oil storage tank area, the waste gas treatment technologies mainly comprise an activated carbon adsorption method, an absorption method, a condensation method, a membrane separation method, a TO (direct combustion) furnace and the like, and the technology is successfully applied TO the treatment of the discharged VOCs in the petrochemical oil storage tank area. However, with the increase of the national requirements for atmospheric emission, the national standard for oil gas recovery emission is 25g/m 3 Gradually increased to 60mg/m 3 The removal efficiency of the 'activated carbon adsorption', 'absorption method', 'condensation method' and membrane separation method on organic matters is low and cannot reach the emission standard required by national regulations, the TO furnace can reach the standard, but the investment cost and the operation cost are high, and the method is not suitable for the waste gas treatment of the exhaust of a tank area, and specifically comprises the following steps:
(1) adopt oil gas recovery system alone: the emission concentration of the tail gas of the treatment tank field is 25g/m 3 Can not meet the national standard requirement that the discharge concentration of VOCs is less than 60mg/m 3 The environmental protection requirement of (2);
(2) and (3) burning in a TO furnace: only aiming at continuously and stably discharging waste gas with high concentration, the waste gas discharged from a petrochemical tank area is exhausted in a clearance mode, the concentration fluctuation is large, the TO furnace is unstable in operation, and a large amount of fuel is consumed when the concentration of VOCs in the waste gas is low;
(3) and (3) burning by using an RTO furnace: only aiming at continuously and stably discharging waste gas with low concentration, the waste gas discharged from a petrochemical tank area is exhausted in a clearance mode, the concentration fluctuation is large, the RTO furnace is unstable in operation, when the concentration of VOCs in the waste gas is high, the RTO furnace is easy to overheat and has explosion risk, and the concentration fluctuation causes unstable system operation;
(4) RCO/CO furnace system: only aiming at continuously and stably discharging waste gas with low concentration, the catalyst has higher requirements on the components and the concentration of the waste gas, but the waste gas discharged from a petrochemical tank area is exhausted in a clearance way, the concentration fluctuation is larger, the RCO/CO furnace is easy to overtemperature to cause the catalyst to lose efficacy, the discharge of the treated waste gas does not reach the standard, and the concentration fluctuation causes the unstable operation of a system;
(5) active carbon adsorption desorption system: because the waste gas discharged from the tank area contains low boiling point substances such as C2, C3 and the like, the adsorption effect of the activated carbon is poor, and the waste gas can not be stably discharged up to the standard;
(6) light and oxygen plasma process: the device is only suitable for low-concentration and odor-containing waste gas, has a certain effect on deodorization, and the waste gas discharged from the petrochemical tank area is exhausted in a clearance mode, has large concentration fluctuation, has safety risk in the treatment process, and is limited to be used at present.
Disclosure of Invention
The invention aims TO solve the problems of low treatment efficiency, high operation cost and unqualified discharge generally existing when oil gas recovery treatment is adopted for high-concentration and intermittently-discharged VOCs pollutants in waste gas of a petrochemical oil storage tank area in the prior art, and high operation energy consumption and high cost caused by low heat recovery efficiency (about 50%) of direct incineration treatment by adopting a TO furnace, and the invention mainly aims TO provide a petrochemical tank area waste gas treatment system combining oil gas condensation recovery with RTO (regenerative thermal oxidizer), wherein a combined structure of condensation method oil gas recovery and RTO (regenerative thermal oxidizer) is adopted for treating waste gas of the petrochemical tank area, and the discharge concentration of VOCs is less than 60mg/m 3 ) And (5) discharging.
The invention also aims to provide a petrochemical tank area waste gas treatment process combining oil gas condensation and recovery with RTO, wherein through the combination of oil gas desulfurization, double-channel condensation and recovery and RTO treatment, the waste gas discharged from the tank area is firstly condensed to adsorb oil gas recovery, and then the waste gas after oil gas recovery is subjected to oxidative decomposition and removal by using an RTO incinerator, so that the treatment efficiency can reach more than 99%.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a petrochemical tank area waste gas treatment system combining oil gas condensation recovery and RTO (regenerative thermal oxidizer), which comprises an oil gas desulfurization unit, a two-channel oil gas condensation recovery unit, an active carbon adsorption unit and an RTO high-temperature thermal oxidation treatment unit, wherein the oil gas desulfurization unit, the two-channel oil gas condensation recovery unit, the active carbon adsorption unit and the RTO high-temperature thermal oxidation treatment unit are sequentially communicated through pipelines; wherein:
the oil gas desulfurization unit comprises a first flame arrester, an oil gas fan and a desulfurization washing tower which are sequentially communicated through pipelines, the oil gas fan is introduced into the bottom of the desulfurization washing tower through a pipeline, and waste gas in a petrochemical tank area enters the desulfurization washing tower through the oil gas fan to be desulfurized;
the dual-channel oil gas condensation recovery unit comprises a first cold box unit, a second cold box unit, a refrigerating unit and an oil receiving tank, wherein the first cold box unit and the second cold box unit are connected in parallel and adopt a 'one-for-one' alternative working mode, inlets of the first cold box unit and the second cold box unit are connected with the top of the desulfurization washing tower, and oil outlets of the first cold box unit and the second cold box unit are respectively communicated with the oil receiving tank; the first cold box unit and the second cold box unit are communicated with each other through the refrigerating unit to form an oil-gas condensation circulation loop, the desulfurized waste gas is converted into liquid-phase oil which can flow into the oil receiving tank, and the uncondensed low-concentration waste gas flows into the activated carbon adsorption unit;
the activated carbon adsorption unit comprises a first activated carbon tank, a second activated carbon tank and a vacuum pump which are connected in parallel, the inlets at the bottom of the activated carbon adsorption unit are respectively communicated with the outlets of the first cold box unit and the second cold box unit through pipelines, the outlet at the top of the activated carbon adsorption unit is provided with two passages, one passage is respectively communicated with the inlets of the first cold box unit and the second cold box unit through the vacuum pump, and the other passage is communicated with the RTO high-temperature thermal oxidation treatment unit;
RTO high temperature thermal oxidation processing unit burns burning furnace including RTO entry fan, second spark arrester and the RTO that communicates in proper order, RTO entry fan respectively with the export intercommunication of first active carbon jar and second active carbon jar, low concentration waste gas flows in through it in the RTO burns burning furnace, the RTO burns burning furnace and includes RTO regenerator and combustion chamber, just it carries out heat recovery to be equipped with the heat accumulation pottery in the RTO regenerator.
Preferably, the RTO incinerator is provided with a plurality of parallel air inlets which are respectively connected with the RTO inlet fan through pipelines.
Preferably, the system further comprises an exhaust funnel which is communicated with the air outlet of the RTO incinerator.
Preferably, no less than three cold boxes are arranged in the first cold box unit and the second cold box unit and are connected in series.
The invention also provides a petrochemical tank area waste gas treatment process combining oil gas condensation and recovery with RTO, which is used for treating the waste gas in the petrochemical tank area by the petrochemical tank area waste gas treatment system combining oil gas condensation and recovery with RTO and comprises the following steps:
step 1, oil gas desulfurization treatment: the tank area waste gas enters the desulfurization washing tower through the oil-gas fan to be desulfurized (such as H) 2 S) processing;
step 2, oil-gas double-channel condensation and recovery: the desulfurized waste gas passes through the dual-channel oil gas condensation recovery unit, oil gas is converted from a gas phase to a liquid phase and then flows into the oil receiving tank for recovery and storage, and the condensed low-concentration waste gas flows into the activated carbon adsorption unit;
step 3, waste gas activated carbon adsorption and vacuum desorption: the condensed low-concentration waste gas enters the activated carbon adsorption unit to be subjected to activated carbon adsorption and vacuum desorption, and the high-concentration waste gas subjected to vacuum desorption flows back to the dual-channel oil gas condensation recovery unit to be repeatedly condensed and recovered until the concentration of the waste gas is less than 10g/m 3 Flowing into the RTO high-temperature thermal oxidation treatment unit;
and 4, high-temperature thermal oxidation decomposition of the waste gas RTO incinerator: the concentration is less than 10g/m 3 The waste gas flows into the RTO high-temperature thermal oxidation treatment unit to be decomposed into CO by high-temperature thermal oxidation 2 And H 2 O, the high-temperature waste gas after thermal oxidation decomposition is subjected to heat recovery through the RTO regenerator, and the discharge concentration of VOCs (volatile organic chemicals) of the waste gas is less than 60mg/m 3 Discharging after reaching the standard.
Preferably, in the step 2, the dual-channel oil gas condensation and recovery unit performs three-stage low-temperature condensation on the oil gas in the desulfurized waste gas, and sequentially performs low-temperature condensation and recovery at three stages of 0-5 ℃, 20-30 ℃ and 65-70 ℃.
Preferably, in step 4, in the RTO high-temperature thermal oxidation treatment unit, the high-temperature thermal oxidation decomposition temperature of the RTO incinerator is not lower than 760 ℃.
In the system and the process for treating the waste gas in the petrochemical tank region by combining oil gas condensation and recovery with RTO, sulfide in the waste gas in the petrochemical tank region is removed in an oil gas desulfurization unit, the oil gas after sulfide removal continuously enters a dual-channel oil gas condensation and recovery unit to cool the oil gas from normal temperature to-65-70 ℃ step by step (the temperature field can be changed and set according to actual needs), most of oil gas in mixed gas is directly liquefied and recovered, the rest extremely small amount of oil gas is adsorbed and separated in an adsorption unit through adsorption process and air, the system continuously circulates through the processes to achieve continuous cooling and fractional condensation recovery of the oil gas, and the oil gas treated by a terminal is discharged until the standard of the treated oil gas reaches the standard, wherein the related process principle is as follows:
absorption principle: h in the exhaust gas according to acid-base neutralization reaction 2 Reaction of S with NaOH solution in desulfurizing washing tower to produce Na 2 S, mixing H 2 S is trapped, and the oil gas which is insoluble in water flows into the dual-channel oil gas condensation recovery unit.
The refrigeration principle is as follows: when the double-channel oil gas condensation recovery unit works, high-temperature and high-pressure refrigerant gas discharged by a compressor enters a condenser to be condensed into high-pressure supercooled liquid, the high-temperature and high-pressure refrigerant gas is throttled and reduced in pressure by an expansion valve to become low-temperature and low-pressure gas-liquid two-phase mixture, the low-temperature and low-pressure gas-liquid two-phase mixture enters an evaporator (heat exchanger), the refrigerant absorbs heat of oil gas passing through the evaporator in the evaporator to be gasified, the refrigerant is fully gasified and then sucked into a compression chamber by the compressor to enter next cycle, the whole system continuously circulates through the processes, the aim of continuously cooling and recovering the oil gas is fulfilled, the oil gas is cooled to reach a supersaturated state and condensed into liquid state to be directly recovered, and a minimum part of gas enters a rear-stage active carbon adsorption unit to be adsorbed and treated.
Pressure swing adsorption principle: the pressure swing adsorption process separates the difficult-to-adsorb air component from the easy-to-adsorb oil gas component by utilizing the selectivity of the adsorbent to the adsorbate, namely the difference of the binding force between each component in the oil gas-air mixed gas and the adsorbent. Meanwhile, the oil gas is desorbed under vacuum to regenerate the adsorbent by utilizing the characteristic that the adsorption capacity of the adsorbent to the adsorbate is different along with the pressure change, and the whole operation process is carried out at the ambient temperature and comprises two basic operations of adsorption and regeneration.
RTO principle: the waste gas is conveyed to the RTO furnace from the oil gas recovery system through a draught fanThe thermal oxidation decomposition of the oxygen and the high temperature of over 760 ℃ in the RTO furnace is carried out to obtain CO 2 And H 2 And O. Since the exhaust gas is preheated in the heat storage chamber, the fuel consumption is greatly reduced. The combustion chamber has two functions: firstly, guarantee that waste gas can reach the oxidation temperature of settlement, secondly guarantee that there is sufficient dwell time to make the abundant oxidation of VOC in the waste gas, waste gas burns in the combustion chamber, leaves the combustion chamber behind the high-temperature gas who becomes the purification, gets into the regenerator (cooled in preceding circulation), and discharge after the heat release cooling, and the regenerator heaies up (is used for next circulation heating waste gas) after absorbing a large amount of heats, and the waste gas after the purification is discharged into the atmosphere through the chimney.
The invention adopts a condensation method oil gas recovery and RTO combined process to treat the tank area waste gas in the petrochemical industry, firstly, the high-concentration oil gas in the storage tank area passes through a condensation oil gas recovery system, and the oil gas in the waste gas is converted from a gas phase to a liquid phase for collection and recovery, thereby achieving good oil gas recycling economic benefits. Meanwhile, the concentration of the waste gas after oil gas recovery is less than 10g/m 3 Then decomposed into CO by high-temperature thermal oxidation at over 760 ℃ in an RTO incinerator 2 And H 2 O, the high-temperature waste gas after thermal oxidation is subjected to heat recovery through the heat storage ceramic of the RTO, so that the waste gas in the tank area is recycled (the recovery efficiency is 95 percent) and subjected to RTO thermal oxidation treatment (the treatment efficiency is more than 98 percent and the heat recovery efficiency is more than 95 percent), and the system is ensured to continuously and stably reach the standard (the discharge concentration of VOCs is less than 60 mg/m) 3 ) Compared with the prior art, the discharge method has the following beneficial effects:
(1) by adopting a double-channel three-stage condensation, activated carbon adsorption and vacuum desorption oil gas recovery process, the temperature of the waste gas is condensed to be below 70 ℃ below zero, and the problem that the continuous and stable operation of an oil gas system is influenced due to the blockage of a heat exchanger at low temperature is solved.
(2) The oil gas recovery efficiency reaches more than 95 percent, and the concentration of the outlet waste gas is less than 10g/m 3 。
(3) The processing efficiency of oil gas recovery and RTO by a condensation method is more than 99 percent, and the discharge TVOC is less than 60mg/m 3 The effects of reducing the operation cost of the system, improving the removal efficiency, achieving the environmental protection stability and standard and prolonging the service life of the system to the maximum extent can be achieved.
Drawings
FIG. 1 is a schematic diagram of a waste gas treatment system of a petrochemical tank field combining oil gas condensation recovery and RTO in an embodiment;
the reference numbers are as follows: 1 first spark arrester, 2 oil gas fan, 3 desulfurization scrubbing towers, 4 first cold box units, 5 second cold box units, 6 refrigerating unit, 7 first activated carbon tank, 8 second activated carbon tank, 9 vacuum pump, 10 oil receiving tank, 11RTO entry fan, 12 second spark arrester, 13RTO burns burning furnace, 14 exhaust ducts.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
FIG. 1 schematically illustrates an oil gas condensation recovery and RTO combined petrochemical tank field waste gas treatment system, which comprises an oil gas desulfurization unit, a two-channel oil gas condensation recovery unit, an activated carbon adsorption unit and an RTO high-temperature thermal oxidation treatment unit which are sequentially communicated through pipelines; wherein:
the oil gas desulfurization unit comprises a first flame arrester 1, an oil gas fan 2 and a desulfurization washing tower 3 which are sequentially communicated through a pipeline, the oil gas fan 1 is introduced into the bottom of the desulfurization washing tower 3 through the pipeline, and waste gas in a petrochemical tank area enters the desulfurization washing tower 3 through the oil gas fan 1 for desulfurization treatment;
the dual-channel oil gas condensation recovery unit comprises a first cold box unit 4, a second cold box unit 5, a refrigerating unit 6 and an oil receiving tank 10, wherein the first cold box unit 4 and the second cold box unit 5 are connected in parallel and adopt a 'one-for-one' alternative working mode, inlets of the first cold box unit and the second cold box unit are connected with the top of the desulfurization washing tower 3, and oil outlets of the first cold box unit and the second cold box unit are respectively communicated with the oil receiving tank 10; the first cold box unit 4 and the second cold box unit 5 are communicated with each other through the refrigerating unit 6 to form an oil-gas condensation circulation loop, the desulfurized waste gas is converted into liquid-phase oil which can flow into the oil receiving tank, and the uncondensed low-concentration waste gas flows into the activated carbon adsorption unit; wherein the first cold box unit 4 and the second cold box unit 5 are internally provided with three cold boxes connected in series;
the activated carbon adsorption unit comprises a first activated carbon tank 7, a second activated carbon tank 8 and a vacuum pump 9 which are connected in parallel, inlets at the bottoms of the activated carbon adsorption unit are communicated with air outlets of the first cold box unit 4 and the second cold box unit 5 through pipelines, outlets at the tops of the activated carbon adsorption unit are provided with two passages, one passage is communicated with inlets of the first cold box unit 4 and the second cold box unit 5 through the vacuum pump 9, and the other passage is communicated with the RTO high-temperature thermal oxidation treatment unit;
the RTO high-temperature thermal oxidation treatment unit comprises an RTO inlet fan 11, a second flame arrester 12 and an RTO incinerator 13 which are sequentially communicated, the RTO inlet fan 11 is respectively communicated with outlets of a first activated carbon tank 7 and a second activated carbon tank 8, low-concentration waste gas flows into the RTO incinerator 13 through the RTO inlet fan, the RTO incinerator 13 is provided with a plurality of parallel gas inlets which are respectively connected with the RTO inlet fan 11 through pipelines, an RTO regenerator and a combustion chamber are arranged in the RTO incinerator 13, and heat storage ceramics are arranged in the RTO regenerator for heat recovery; and the exhaust funnel 14 is communicated with the air outlet of the RTO incinerator 13.
When the petrochemical tank area waste gas treatment system combining oil gas condensation and recovery with RTO is adopted to treat the waste gas in the petrochemical tank area, the specific process steps are as follows:
step 1, oil gas desulfurization treatment: the waste gas in the tank area enters a desulfurization washing tower through an oil-gas fan for desulfurization (such as H) 2 S) processing;
step 2, oil-gas double-channel condensation and recovery: the desulfurized waste gas passes through a double-channel oil gas condensation recovery unit, oil gas is converted into a liquid phase from a gas phase and then flows into an oil collecting tank for recovery and storage, the condensed low-concentration waste gas flows into an activated carbon adsorption unit, and the double-channel oil gas condensation recovery unit is used for carrying out three-stage low-temperature condensation on the oil gas in the desulfurized waste gas and sequentially carrying out low-temperature condensation recovery at three stages of 0-5 ℃, 20-30 ℃ and 65-70 ℃;
step 3, waste gas activated carbon adsorption and vacuum desorption: the condensed low-concentration waste gas enters an active carbon adsorption unit for active carbon adsorption and vacuum desorption, and vacuum is carried outThe desorbed high-concentration waste gas flows back into the dual-channel oil gas condensation recovery unit for repeated condensation recovery until the concentration of the waste gas is less than 10g/m 3 Flowing into an RTO high-temperature thermal oxidation treatment unit;
and 4, high-temperature thermal oxidation decomposition of the waste gas RTO incinerator: the concentration is less than 10g/m 3 The waste gas flows into the RTO high-temperature thermal oxidation treatment unit to be subjected to high-temperature thermal oxidation decomposition to CO at the temperature of not lower than 760 DEG C 2 And H 2 O, the high-temperature waste gas after thermal oxidation decomposition is subjected to heat recovery through an RTO regenerator, and the discharge concentration of VOCs (volatile organic chemicals) of the waste gas is less than 60mg/m 3 The discharge reaches the standard.
In conclusion, the system provided by the invention adopts a combined process of 'condensing oil gas recovery + RTO' to treat the waste gas oil gas in the tank area of the petrochemical industry, the treatment efficiency is more than 99%, and the TVOC emission is less than 60mg/m 3 The service life of the system can be prolonged to the maximum extent while the environmental protection is stable and reaches the standard.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (7)

1. A petrochemical tank area waste gas treatment system combining oil gas condensation recovery with RTO is characterized by comprising an oil gas desulfurization unit, a double-channel oil gas condensation recovery unit, an active carbon adsorption unit and an RTO high-temperature thermal oxidation treatment unit which are sequentially communicated through pipelines; wherein:
the oil gas desulfurization unit comprises a first flame arrester, an oil gas fan and a desulfurization washing tower which are sequentially communicated through pipelines, the oil gas fan is introduced into the bottom of the desulfurization washing tower through a pipeline, and waste gas in a petrochemical tank area enters the desulfurization washing tower through the oil gas fan to be desulfurized;
the dual-channel oil gas condensation recovery unit comprises a first cold box unit, a second cold box unit, a refrigerating unit and an oil receiving tank, wherein the first cold box unit and the second cold box unit are connected in parallel and adopt a 'one-for-one' alternative working mode, inlets of the first cold box unit and the second cold box unit are connected with the top of the desulfurization washing tower, and oil outlets of the first cold box unit and the second cold box unit are respectively communicated with the oil receiving tank; the first cold box unit and the second cold box unit are communicated with each other through the refrigerating unit to form an oil-gas condensation circulation loop, the desulfurized waste gas is converted into liquid-phase oil which can flow into the oil receiving tank, and the uncondensed low-concentration waste gas flows into the activated carbon adsorption unit;
the activated carbon adsorption unit comprises a first activated carbon tank, a second activated carbon tank and a vacuum pump which are connected in parallel, the inlets at the bottom of the activated carbon adsorption unit are respectively communicated with the outlets of the first cold box unit and the second cold box unit through pipelines, the outlet at the top of the activated carbon adsorption unit is provided with two passages, one passage is respectively communicated with the inlets of the first cold box unit and the second cold box unit through the vacuum pump, and the other passage is communicated with the RTO high-temperature thermal oxidation treatment unit;
the RTO high-temperature thermal oxidation treatment unit comprises an RTO inlet fan, a second flame arrester and an RTO incinerator which are sequentially communicated, the RTO inlet fan is respectively communicated with outlets of a first activated carbon tank and a second activated carbon tank, low-concentration waste gas flows into the RTO incinerator through the RTO inlet fan, the RTO incinerator comprises an RTO regenerator and a combustion chamber, and heat storage ceramic is arranged in the RTO regenerator for heat recovery.
2. The oil gas condensation and recovery combined RTO petrochemical tank field waste gas treatment system according to claim 1, wherein the RTO incinerator is provided with a plurality of parallel gas inlets which are respectively connected with the RTO inlet fan through pipelines.
3. The oil gas condensing and recycling RTO combined petrochemical tank field waste gas treatment system according to claim 1, further comprising an exhaust funnel communicated with the gas outlet of the RTO incinerator.
4. The oil gas condensing recovery combines RTO's petrochemical tank field exhaust-gas treatment system of claim 1, characterized in that be equipped with in first cold box unit and the second cold box unit not less than three cold boxes and connect in series.
5. The process for treating the waste gas in the petrochemical tank field by combining oil gas condensation and recovery with RTO is characterized in that the waste gas treatment in the petrochemical tank field is carried out by the oil gas condensation and recovery with RTO waste gas treatment system of any one of claims 1 to 4, and comprises the following steps:
step 1, oil gas desulfurization treatment: the tank area waste gas enters the desulfurization washing tower through the oil-gas fan to be desulfurized (such as H) 2 S) processing;
step 2, oil-gas double-channel condensation and recovery: the desulfurized waste gas passes through the dual-channel oil gas condensation recovery unit, oil gas is converted from a gas phase to a liquid phase and then flows into the oil receiving tank for recovery and storage, and the condensed low-concentration waste gas flows into the activated carbon adsorption unit;
step 3, waste gas activated carbon adsorption and vacuum desorption: the condensed low-concentration waste gas enters the activated carbon adsorption unit to be subjected to activated carbon adsorption and vacuum desorption, and the high-concentration waste gas subjected to vacuum desorption flows back to the dual-channel oil gas condensation recovery unit to be repeatedly condensed and recovered until the concentration of the waste gas is less than 10g/m 3 Flowing into the RTO high-temperature thermal oxidation treatment unit;
and 4, high-temperature thermal oxidation decomposition of the waste gas RTO incinerator: the concentration is less than 10g/m 3 The waste gas flows into the RTO high-temperature thermal oxidation treatment unit to be decomposed into CO by high-temperature thermal oxidation 2 And H 2 O, the high-temperature waste gas after thermal oxidation decomposition is subjected to heat recovery through the RTO regenerator, and the discharge concentration of VOCs (volatile organic chemicals) of the waste gas is less than 60mg/m 3 Discharging after reaching the standard.
6. The oil gas condensation and recovery combined RTO petrochemical tank area waste gas treatment process according to claim 5, wherein in step 2, the dual-channel oil gas condensation and recovery unit performs three-stage low-temperature condensation on oil gas in the desulfurized waste gas, and sequentially performs low-temperature condensation and recovery at three stages of 0-5 ℃, 20-30 ℃ and 65-70 ℃.
7. The oil gas condensation recovery and RTO combined petrochemical tank field exhaust gas treatment process according to claim 5, wherein in step 4, the RTO incinerator has a high temperature thermal oxidative decomposition temperature of not less than 760 ℃.
CN202210573057.5A 2022-05-25 2022-05-25 Oil gas condensation recovery combined RTO petrochemical tank area waste gas treatment system and process Pending CN114887443A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115888305A (en) * 2022-11-14 2023-04-04 江苏嘉盛环境设备制造有限公司 Vacuum pump tail gas treatment System (VOCs) process for lithium battery industry
CN117089363A (en) * 2023-10-19 2023-11-21 新乡市华音再生能源设备有限公司 Oil gas condensation recovery device applied to junked tire oil refining system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115888305A (en) * 2022-11-14 2023-04-04 江苏嘉盛环境设备制造有限公司 Vacuum pump tail gas treatment System (VOCs) process for lithium battery industry
CN117089363A (en) * 2023-10-19 2023-11-21 新乡市华音再生能源设备有限公司 Oil gas condensation recovery device applied to junked tire oil refining system

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