CN109045739A - Integral type gas recovery system for oil and recovery process - Google Patents
Integral type gas recovery system for oil and recovery process Download PDFInfo
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- CN109045739A CN109045739A CN201811010635.4A CN201811010635A CN109045739A CN 109045739 A CN109045739 A CN 109045739A CN 201811010635 A CN201811010635 A CN 201811010635A CN 109045739 A CN109045739 A CN 109045739A
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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
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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
- B01D53/02—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
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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
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40011—Methods relating to the process cycle in pressure or temperature swing adsorption
- B01D2259/40013—Pressurization
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40086—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by using a purge gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/402—Further details for adsorption processes and devices using two beds
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Abstract
The invention belongs to Investigation of Petroleum Vapor Recovery Technology field, a kind of integral type gas recovery system for oil and recovery method, including pressure surge tank, tail gas compression and preliminary condensing unit, oil-poor cooling absorption plant, adsorbent equipment, recyclable device are disclosed；Original oil gas is delivered to pressure surge tank, it is delivered to tail gas compression and preliminary condensing unit again, enter the absorption tower of oil-poor cooling absorption plant after overcompression and condensation, No. 93 gasoline enter absorption tower after absorbing the pre-cooling of oily forecooler and absorbing the depth cooling of oil deep freezer, oil-gas transportation after low temperature sprays through absorption tower is to accumulator tank, residual exhaust into adsorbent equipment through being adsorbed, tail gas after absorption drains into atmosphere, and the hydrocarbon component being adsorbed then is recycled to pressure surge tank by Vacuum Heat parsing.Set compression of the present invention, condensed absorbent, absorption are integrated, and emission compliance can be made to have multi-ensuring, be remarkably improved petroleum vapor recovery effect for mega project, are substantially reduced equipment size and are reduced equipment investment.
Description
Technical field
The invention belongs to Investigation of Petroleum Vapor Recovery Technology fields, in particular to a kind of set compression, condensed absorbent, absorption
Integral type gas recovery system for oil and recovery method.
Background technique
Petroleum vapor recovery has very important meaning: firstly, petroleum vapor recovery is conducive to economize on resources, petroleum is non-renewable
Resource, will be exhausted after being finished；Secondly, petroleum vapor recovery can reduce the pollution to environment, gasoline storage and transportation, handling and refueled
Cheng Zhong, oil tank or automotive oil tank can generate a large amount of oil gas because of pressure oscillation, and lead to a large amount of exhaust of oil.Oil gas is main
Ingredient is butane, pentane, benzene, dimethylbenzene, ethylo benzene etc., they belong to carcinogen mostly.At present both at home and abroad to volatile oil and gas
Improvement substantially have a six class methods: condensation method, absorption process, absorption method, membrane separation process, bioanalysis and combustion method are (including urging
Change combustion method).During exhaust of oil vent gas treatment, be substantially all will use it is above-mentioned more than one method combination.But often
All there is obvious disadvantage in process combination, such as: condensation+absorption process route lacks the process of pressurization, and C4ization
The saturated vapor pressure for closing object is very high, needs low-down temperature that could condense if being not pressurized, this makes condensation+absorbing process cold
It coagulates ineffective；In film+absorbing process route or condensation+film+absorbing process route, UF membrane need larger pressure difference can just have compared with
Good effect, and the restricted lifetime of film.
For gasoline carrier entrucking down-mounting type mode, the liquid that when entrucking enters groove tank can will be saturated in original tank truck
It is 70% even higher that gas concentration, which is promoted to volumetric concentration,.Especially in summer, groove tank is in transport by being exposed to the sun and rocking shake
Dynamic, gas concentration is higher, it is necessary to recycle by multistep treatment, just can guarantee stable operation and the emission compliance of reclaimer.
According to isolated basic theories, the separation scheme of heavy constituent, separation are separated and recovered from gas phase mixture
Size and the operating condition of adaptation are described below:
(1) mixed gas is pressurizeed or is condensed, make mixed gas heavy constituent supersaturation condensation；Separate maximum journey
Degree is gas-liquid phase equilibrium；Suitable for saturation and the high operating condition of heavy constituent content, tail gas concentration after handle still in
Isoconcentration；
(2) make mixed gas by the solvent for absorbing heavy constituent can be selected to be absorbed, it, can in order to strengthen assimilation effect
To pressurize and cool down；Separating maximum degree is the solubility equilibria calculated according to Henry's law, and concentration is significantly less than solvent-free
Gas-liquid phase equilibrium；It is suitble to the tail gas concentration in high intermediate concentration operating condition, after being overpressurized, condensed, being absorbed to be in middle low concentration；
(3) make mixed gas by adsorbent bed, it is different using active force of the nature of solid surface to gas with various and
Selective Separation, binding force is most strong, therefore separating can very thoroughly；But binding force is strong, regeneration of adsorbent beds needs stringenter
Working condition.Since the adsorption capacity of adsorbent is restricted, compare so this kind of processing scheme can only be adapted to inlet gas concentration
Low occasion uses.Since adsorbing separation is to ensure that the most economical effective method of emission compliance, so non-in various VOC improvement
Often universal use, but multistage pretreatment must be carried out to the tail gas into adsorption bed, it just can guarantee the effect of device operation
And safety.
Summary of the invention
It is excessively high for the processing rear molding gas concentration of existing petroleum vapor recovery technique or the original oil gas input concentration of processing is too low
The technical issues of, the present invention provides a kind of set compression, condensed absorbent, the integral type gas recovery system for oil of absorption and recycling sides
Method can make emission compliance have multi-ensuring, be remarkably improved petroleum vapor recovery effect for mega project, substantially reduce equipment ruler
Very little and reduction equipment investment.
In order to solve the above-mentioned technical problem, the present invention is achieved by technical solution below:
A kind of integral type gas recovery system for oil, including pressure surge tank, tail gas compression and preliminary condensing unit, oil-poor cooling
Absorption plant, adsorbent equipment, recyclable device；
The entrance of the pressure surge tank is connect with original oil gas by conveyance conduit, the outlet of the pressure surge tank with
The tail gas compression is connected with the entrance of preliminary condensing unit；
The tail gas compression and preliminary condensing unit include three-stage blower and three-level condensing unit, three-level condensing unit point
It is not connected to the outlet of three-stage blower；Meanwhile the outlet of each condensing unit connects with the accumulator tank in the recyclable device
It connects；
The oil-poor cooling absorption plant includes absorbing oily forecooler, absorbing oily deep freezer and absorption tower, the absorption tower
Equipped with tower top feed inlet, tower bottom air inlet, tower top gas outlet and tower bottom liquid outlet；The entrance for absorbing oily forecooler be used for
External Fuel Tanking Unit connection, the outlet for absorbing oily forecooler are connect with the entrance for absorbing oily deep freezer, the absorption
The outlet of oily deep freezer is connect with the tower top feed inlet on the absorption tower, the tower bottom air inlet on the absorption tower and the tail gas pressure
Contracting is connected with the outlet of preliminary condensing unit, and the tower top gas outlet on the absorption tower is connect with adsorbent equipment, the absorption tower
The connection of the accumulator tank of tower bottom liquid outlet and recyclable device；
The adsorbent equipment includes the first adsorption tower, the second adsorption tower, nitrogen heater and vacuum pump, first absorption
The tower bottom of tower and second adsorption tower is connect with the tower top gas outlet on the absorption tower, first adsorption tower and described
The top discharge mouth of two adsorption towers is communicated with the atmosphere；Meanwhile the tower top of first adsorption tower and second adsorption tower with
The outlet of nitrogen heater connects, and the entrance of the nitrogen heater is connect with source nitrogen；First adsorption tower and described
The tower bottom of two adsorption towers is connect with the entrance of the vacuum pump, the outlet of the vacuum pump and the entrance of the pressure surge tank
Connection；
The recyclable device includes accumulator tank and oil recovery blowback receiving apparatus includes accumulator tank and recycling oil pump, the oil-collecting
The entrance of the outlet connection recycling oil pump of tank.
Further, the absorption tower uses stainless steel cloth structured packing or stainless steel random packing, and absorbs
It is provided with liquid in tower and sprays device, which sprays device installation tower inner top region.
Further, the tower top of first adsorption tower and second adsorption tower is communicated with the atmosphere by fire arrester.
Further, the PLC program controls first adsorption tower and second adsorption tower automatically switches work, institute
When stating the first adsorption tower and carrying out adsorption process, second adsorption tower is inversely vented, vacuumized, nitrogen purging, is boosted
Regenerative process；When second adsorption tower carries out adsorption process, first adsorption tower is inversely vented, vacuumized, nitrogen
Purging, the regenerative process boosted.
Further, the vacuum pump is provided with bypass protection.
Further, the recycling oil pump uses No leakage canned motor pump.
A kind of recovery process of above-mentioned integral type gas recovery system for oil carries out in accordance with the following steps:
(1) original oil gas is delivered to the pressure surge tank, then is delivered to the tail gas compression and preliminary condensing unit, warp
Cross the compressor compresses；The outlet of every grade of compressor all carries out circulating water, to control the compressor outlet exhaust temperature
Degree is lower than 65 degree；Oil gas temperature after three stage compression and three-level condensation is lower than 35 degree, as described in tower bottom air inlet entrance
Absorption tower, moisture and high boiling component, which are largely condensed, is delivered to the accumulator tank；
(2) the oil-poor cooling absorption plant uses No. 93 gasoline, by the pre-cooling for absorbing oily forecooler and described
After the depth cooling for absorbing oily deep freezer, until -35 degree enter the absorption tower by the tower top feed inlet, by the absorption tower top
Portion sprays device progress low temperature and sprays, and the oil gas after spray-absorption is delivered to the accumulator tank, residual exhaust warp with gasoline
The tower top gas outlet on the absorption tower enters the adsorbent equipment.
(3) tail gas enters the first adsorption tower by tower bottom or the second adsorption tower is adsorbed, and the tail gas after absorption is by first
Adsorption tower or the second adsorption tower top discharge mouth drain into atmosphere, and the hydrocarbon component being adsorbed then is recycled to by Vacuum Heat parsing
Pressure surge tank.
Further, when the adsorbance of the first adsorption tower described in the step (3) reaches design value, PLC program control
It switches to second adsorption tower and enters adsorption process, while controlling the first adsorption tower and entering regenerative process；Second absorption
When the adsorbance of tower reaches design value, PLC program control switches to first adsorption tower and enters adsorption process, while controlling the
Two adsorption towers enter regenerative process, loop back and forth like this.
The beneficial effects of the present invention are:
(1) present invention carries out the process of compression condensation absorption before absorption, overcomes oil gas and is directly over adsorption bed
This traditional handicraft can only be adapted to the difficult point of the relatively low operating condition of inlet gas concentration, eliminate before adsorbing separation to will be adsorbed
The multistage preprocessing process of tail gas；And the process reabsorbed by compression condensation, oil gas mass fraction can be greatly lowered, most
The oil gas by combination alternating temperature pressure-variable adsorption recycling low quality concentration is, it can be achieved that emission compliance multi-ensuring afterwards, and reaching both can be with
It is worth higher organic matter in recycling oil gas, and can satisfy the purpose of exhaust of oil index, and can be significantly to mega project
Improve recovering effect.
(2) the absorption regeneration stage of the present invention adds vacuum analysis using nitrogen (air) thermal purging, and adsorbent reactivation is thorough,
Extend sorbent life, ensure that the long-term efficient stable operation of absorbing unit.
(3) present invention is condensed and is absorbed before absorption, reduces gas concentration and temperature；With nitrogen blowback and
Urgent protective program；Recyclable device is equipped with No leakage canned motor pump；Entire gas recovery system for oil has temperature, pressure alarm and tight
Anxious parking procedure；Therefore security performance is high.
(4) operating cost of the present invention is low, Fine design, it is ensured that good reliability, long service life was up to 10 years or more.
(5) system of the invention uses skid mode, and compact-sized, occupied area is small, the construction investment effectively reduced.
Detailed description of the invention
Fig. 1 is that the structural schematic diagram of integral type gas recovery system for oil provided by the present invention (is existed with the setting of nitrogen heater 8
For adsorption tower outside).
In above-mentioned figure: 1- valve；2- pressure surge tank；3- compressor；4- condensing unit；The absorption tower 5-；It is pre- that 6- absorbs oil
Cooler；7- absorbs oily deep freezer；8- nitrogen heater；The first adsorption tower of 9-；The second adsorption tower of 10-；11- vacuum pump；12- oil-collecting
Tank；13- No leakage canned motor pump；
A-o: stream stock.
Specific embodiment
For that can further appreciate that summary of the invention of the invention, feature and effect, the following examples are hereby given, and cooperates attached drawing
Detailed description are as follows:
As shown in Figure 1, the present embodiment discloses a kind of integral type oil gas time for gathering compression, condensed absorbent, absorption first
Receipts system, mainly include pressure surge tank 2, tail gas compression and preliminary condensing unit, oil-poor cooling absorption plant, adsorbent equipment,
Recyclable device.
The conveyance conduit of original oil gas by valve 1 connect pressure surge tank 2 entrance, the outlet of pressure surge tank 2 with
Tail gas compression is connected with preliminary condensing unit.Original oil gas is transported to pressure surge tank 2 by conveyance conduit, then by pressure buffer
Tank 2 is transported to tail gas compression and preliminary condensing unit by conveyance conduit.
Tail gas compression and preliminary condensing unit include three-stage blower 3 and three-level condensing unit 4, a compressor 3 and one
A condensing unit 4 is a unit, totally three units and three units are sequentially connected；Three condensing units 4 are connected respectively
In the outlet of three compressors 3,3 cylinder body of compressor and outlet carry out circulating water, to reach three stage compression, three-level is cold
Solidifying effect.Specifically, 3 entrance of compressor of the outlet connection first order of pressure surge tank 2, the compressor 3 of the first order export
Connect 4 entrance of condensing unit of the first order, 3 entrance of compressor of the outlet of the condensing unit 4 connection second level of the first order, the second level
Compressor 3 outlet connection the second level 4 entrance of condensing unit, the second level condensing unit 4 outlet connection the third level compression
3 entrance of machine, 4 entrance of condensing unit of the outlet of the compressor 3 connection third level of the third level.First order refrigeration can cool down most of water
Point and heavy constituent；The second level is freezed the component of condensable major part C6 or more, but the concentration of C4, C5 at this time are still higher；Third
Grade refrigeration ensures that the gas concentration into absorption tower 5 is reduced to zone of reasonableness.The outlet of each condensing unit 4 simultaneously with recycling
Accumulator tank 12 in device connects, so that the component for being condensed into liquid is recycled by pipeline to accumulator tank 12.
Oil-poor cooling absorption plant includes absorbing oily forecooler 6, absorbing oily deep freezer 7 and absorption tower 5, absorbs oily forecooler
6 entrance is used to connect external Fuel Tanking Unit by conveyance conduit, and the outlet connection for absorbing oily forecooler 6 absorbs oily deep freezer 7
Entrance, the outlet for absorbing oily deep freezer 7 connects 5 tower top feed inlet of absorption tower.No. 93 gasoline are by pipeline to absorbing oil
Forecooler 6 is inputted again by conveyance conduit after pre-cooling and absorbs oily cryogenic system 7, after being pre-chilled and deep cooling is cooled to -35 DEG C
It is delivered to 5 tower top feed inlet of absorption tower and enters absorption tower 5.
Absorption tower 5 is equipped with tower top feed inlet, tower bottom air inlet, tower top gas outlet and tower bottom liquid outlet, and tower top feed inlet is logical
Piping connection absorbs the outlet of oily deep freezer 7, and tower bottom air inlet is connected in tail gas compression and preliminary condensing unit by pipeline
The condensing unit 4 of third unit exports, and tower top gas outlet connects adsorbent equipment by pipeline, and tower bottom liquid outlet is connected by pipeline
The accumulator tank 12 of recyclable device.By entering absorption tower 5 by tower top feed inlet by No. 93 cooling gasoline of pre-cooling and deep cooling, by
Tail gas compression and preliminary condensing unit treated residual exhaust enter absorption tower 5 through tower bottom air inlet.Absorption tower 5 uses stainless
Steel wire structured packing or stainless steel random packing provide the surface that gas-liquid comes into full contact with.Liquid leaching is provided in absorption tower 5
Spray apparatus, the liquid spray device installation tower inner top region；The liquid of 5 top spray of absorption tower is cooling and absorption carrys out autocondensation
Oil gas afterwards, the oil gas mass fraction after spray-absorption significantly reduce, and most oil gas are absorbed, the tail after absorption
Gas enters adsorbent equipment by tower top gas outlet, and absorbed oil gas is transported in recyclable device with gasoline by tower bottom liquid outlet
In accumulator tank 12.
Adsorbent equipment includes nitrogen heater 8, the first adsorption tower 9, the second adsorption tower 10, vacuum pump 11.First adsorption tower 9
It is all connected with the tower top gas outlet on absorption tower 5 with the tower bottom of the second adsorption tower 10, the tail gas absorbed by compression condensation is made to enter suction
Attached process section.The tower top of first adsorption tower 9 and the second adsorption tower 10 is all connected with fire arrester, is up to the tail gas of emission request through hindering
Firearm heel row is to atmosphere.
First adsorption tower 9 and the second adsorption tower 10 are by PLC program control system according to the time for presetting, adjusting
Automatic work, and by absorption, the course of work be inversely vented, vacuumize, nitrogen purging, boost.Wherein, when the first absorption
9 hydro carbons adsorbance of tower reaches certain value, before tower top will penetrate, and PLC program control system can automatically switch to the second absorption
Tower 10 carries out absorption work, and first adsorption tower 9 is transferred to regeneration stage；Similarly, when 10 hydro carbons adsorbance of the second adsorption tower reaches
To certain value, before tower top will penetrate, PLC program control system can automatically switch to the first adsorption tower 9 and carry out absorption work,
And second adsorption tower 10 is transferred to regeneration stage.The operating process of first adsorption tower 9 and the second adsorption tower 10 such as table 1:
1 adsorption tower operating process of table
First adsorption tower 9, the second adsorption tower 10 tower top connect with the outlet of nitrogen heater 8, nitrogen heater 8
Entrance is connect with source nitrogen.Nitrogen heater 8 is also built-in inside the first adsorption tower 9, the second adsorption tower 10, uses electric heating
Or steam-coil-heater.First adsorption tower 9, the second adsorption tower 10 tower bottom connect with the entrance of vacuum pump 11, vacuum pump 11
Outlet connect with the entrance of pressure surge tank 2.Vacuum pump 11 is provided with bypass protection, when flow is excessive or the pump that stops in emergency
When stopping working, gas can be circulated by bypass
Specifically, the adsorbent of precision using variety classes and is adsorbed in the first adsorption tower 9 and the second absorption according to operating condition
Filling is layered in tower 10, it is assumed that by treated on absorption tower 5 tail gas is introduced into the first adsorption tower 9, the first adsorption tower 9 enters absorption
State, the hydrocarbon component in oil gas are adsorbed by adsorbent in micropore, and air then penetrates layer of charcoal.Reach the tail gas of emission request by
The tower top of first adsorption tower 9 through fire arrester heel row to atmosphere, when 9 inside hydro carbons adsorbance of the first adsorption tower reach certain value,
Before tower top will penetrate, PLC program control system can automatically switch to the second adsorption tower 10 and carry out absorption work, and this first is inhaled
Attached tower 9 is transferred to regeneration stage.The first adsorption tower 9 into regeneration stage is first inversely vented, and the progress of vacuum pump 11 is restarted
Parsing is vacuumized, and equipped with the heated nitrogen purging that nitrogen heater 8 provides, forms alternating temperature transformation combine adsorption.
Adsorbent equipment also sets up safety interlocking, when the bed middle section temperature of the first adsorption tower 9 or the second adsorption tower 10 is higher than
At 65 degree, adsorbent equipment stops in emergency, and tail gas stops entering adsorbent equipment and switches emergency blow-down, and nitrogen is replaced into system, and
And first adsorption tower 9 and the second adsorption tower 10 all enter the state of cooling.
Recyclable device includes accumulator tank 12 and recycling oil pump, wherein recycling oil pump uses No leakage canned motor pump 13.Accumulator tank
12 entrance is separately connected the tower bottom liquid outlet on each condensing unit 4 and absorption tower 5, the outlet connection recycling oil pump of accumulator tank 12
Entrance.
Entire petroleum vapor recovery process passes through tail gas compression first and preliminary condensing unit carries out three stage compression, three-level condensation,
So that moisture and high boiling component are largely condensed；Residual exhaust is sent into oil-poor cooling absorption plant, No. 93 gasoline again
Pre-cooled and deep cooling absorbs the oil gas of the overwhelming majority to -35 DEG C, then tail gas is sent into adsorbent equipment through treated on absorption tower 5,
Hydro carbons in oil gas is adsorbed, and reach the tail gas of emission request by adsorbent equipment top discharge mouth through fire arrester heel row to big
Gas finally carries out Vacuum Heat parsing.The present invention has the characteristics that emission compliance multi-ensuring, and present device operating cost
Low, Fine design, long service life, and occupied area is small, effectively reduces construction investment.
Specifically, the recovery method based on above-mentioned integral type gas recovery system for oil carries out in accordance with the following steps:
(1) original oil gas is delivered to pressure surge tank 2 by valve 1, then by conveyance conduit be delivered to tail gas compression with
Preliminary condensing unit compresses oil gas by compressor 3；Every grade of outlet of compressor 3 all carries out circulating water, to control compression
3 outlet exhaust temperatures of machine are lower than 65 degree；Oil gas temperature after three stage compression and three-level condensation enters absorption tower 5 lower than 35 degree；
Moisture and high boiling component, which are largely condensed, is delivered to accumulator tank 12, and oil gas mass fraction reduces, and residual exhaust enters poor
The cooling absorption plant of oil.
(2) oil-poor cooling absorption plant is cooled to -35 degree by pre-cooling and depth, by inhaling using No. 93 common gasoline
Device progress low temperature is sprayed at the top of receipts tower 5 to spray, while the liquid that gas is sprayed by low temperature is cooling, overwhelming majority oil in tail gas
Gas is absorbed into liquid；By spray-absorption, oil gas mass fraction is further decreased, and most oil gas are absorbed, and is inhaled
The oil gas of receipts is delivered to accumulator tank 12 with gasoline, and residual exhaust enters adsorbent equipment through 5 tower top gas outlet of absorption tower.
(3) tail gas enters the first adsorption tower 9 or the second adsorption tower 10, and the hydrocarbon component in oil gas is adsorbed by adsorbent micro-
Kong Zhong, air then penetrate layer of charcoal, and the tail gas for reaching emission request is passed through by the first adsorption tower 9 or 10 top discharge mouth of the second adsorption tower
Fire arrester heel row is to atmosphere, and the hydrocarbon component being adsorbed then is recycled to pressure surge tank 2 by Vacuum Heat parsing.
When first adsorption tower 9 (or second adsorption tower 10) hydro carbons adsorbance reaches certain value, before tower top will penetrate, lead to
PLC program control system is crossed according to the time for presetting, adjusting, automatically switches to (or the first absorption of the second adsorption tower 10
Tower 9) absorption work is carried out, and the first adsorption tower 9 (or second adsorption tower 10) is transferred to regeneration stage, by vacuum pump 11 to its vacuum
Thermal desorption is to absolute pressure 5KPa hereinafter, the hydro carbons being adsorbed in adsorbent hole is desorbed out.In order to keep hydro carbons desorption clean, nitrogen
Gas, which enters after the heating of nitrogen heater 8 from first adsorption tower 9 (or second adsorption tower 10) tower top, carries out thermal purging inside tower
Or purged through electric heating or steam-coil-heater directly inside tower and to the first adsorption tower 9 (or second adsorption tower 10),
The hydro carbons of desorption is then discharged into pressure surge tank 2 by the first adsorption tower 9 (or second adsorption tower 10).
Effect of the invention is verified below by test example:
Oil vapor treatment amount is 1600Nm in test example3/ h, table 2 are the technological design major parameter of test example 1.
The technological design major parameter of 2 test example of table
This programme is that tail gas is boosted to 0.5MPaG by the three stage compression of compressor 3；3 cylinder body of compressor and every grade go out
Mouth all carries out circulating water, controls every grade of 3 outlet exhaust temperatures of compressor and is lower than 65 degree；By the recirculated water of condensing unit 4
Temperature enters next stage lower than 35 degree after cooling；Moisture and high boiling component are largely condensed, Petroleum Vapor Mass Concentration by
84% is reduced to 55%, and residual exhaust enters oil-poor cooling absorption plant.Since C4, C3, C2 for containing in oil gas are very difficult to
By compression condensation, so subsequent will use the scheme of absorption and absorption to reinforce recovering effect.
Oil-poor cooling absorption plant can reach relatively high degree of purification, oil-poor to utilize No. 93 gasoline, by the oil depot of owner
It is delivered to battery limit (BL), -35 degree are cooled to by absorbing the pre-cooling of oily forecooler 6 and absorbing the depth of oily deep freezer 7, by absorption tower 5
Top spray, which absorbs, comes from condensed oil gas.Absorption tower 5 uses stainless steel cloth structured packing or stainless steel random packing,
The surface that gas-liquid comes into full contact with is provided, while the liquid that gas is sprayed by low temperature is cooling, most oil gas quilts in tail gas
It is absorbed into liquid.By spray-absorption, oil gas volumetric concentration is reduced by 55% to 1.6%, and most oil gas are absorbed, and are inhaled
Tail gas after receipts enters adsorption system.Since gas gross is bigger, the oil-gas component flow total to the node is also
11.51kg/h.For this programme after the multistage pretreatment such as overcompression, condensation, absorption, the working condition to the node is very solid
Fixed, oil-gas component total amount is only linear according to entrucking load, does not vary with temperature.Unabsorbed main component is
C2, C3, C4 and a small amount of C5.
It is oil-poor cooling directly cooling using refrigeration unit freon, heat transfer temperature difference is reduced, heat transfer effect is improved.Be cooled to-
35 degree only need one stage of compression, purchase common refrigeration machine and are just able to satisfy requirement.By energy balance, when summer maximum load
P- 38 degree of refrigeration requirements are 220,000 kilocalories, 300,000 kilocalorie unit of type selecting, shaft power 140KW, motor matching 160KW.
Summer maximum into 5 gas flow of absorption tower be 165m3/ h considers the higher operating condition of winter fixed gas concentration of component,
I.e. 3 exit gas of three-stage blower is all thought of as fixed gas, flow 220m3/h.5 design conditions of absorption tower are as follows: gas stream
Measure 220m3/ h, fluid flow 8m3/ h calculates tower diameter 0.4m, and rounding simultaneously reserves a part of surplus, designs tower diameter 0.5m, fills out
Expect height 2m.
Oil gas is after absorption tower 5 is handled, the hydrocarbon component quilt into the first adsorption tower 9 or the second adsorption tower 10, in oil gas
Adsorbent is adsorbed in micropore, and air then penetrates layer of charcoal.Reach the tail gas of emission request by adsorption tanks top discharge mouth through back-fire relief
Device heel row is to atmosphere.When first adsorption tower 9 (or second adsorption tower 10) hydro carbons adsorbance reach certain value, at the top of adsorption tanks i.e.
Before penetrating, the second adsorption tower 10 (or first adsorption tower 9) is automatically switched to according to presetting by PLC program control system
Absorption work is carried out, and the first adsorption tower 9 (or second adsorption tower 10) is transferred to regeneration stage, is evacuated to by vacuum pump 11 to it
Hereinafter, being equipped with nitrogen thermal purging, the hydro carbons being adsorbed in adsorbent hole is desorbed out absolute pressure 5KPa.
It is 11.51kg/h into the maximum oil and gas content of the first adsorption tower 9 or the second adsorption tower 10 according to calculated result,
0.18Kmol/h.It is verified, is calculated according to an adsorption cycle 1h, equilibrium adsorption according to this laboratory measured data and related data
Adsorbent inventory is 0.28m3, consider that the influence of decaying and the enrichment of C2 low boiling component and the first adsorption tower 9 or second are inhaled
Gas flow rate controls in attached tower 10, adsorbent inventory 1.4m3, diameter 0.6m loads height 1.3m, different using multilayer
Combination of adsorbents filling.
Mass fraction of the 3 test example oil gas each component of table in each stream stock, each stream stock are as shown in Figure 1.
As shown in Table 3, through three stage compression three-level condensation after, oil gas mass fraction is greatly lowered, oil gas mass fraction by
84.027% in flow of feed gas stock c is reduced to 55.117% in stream stock i,.Wherein C2, C3, C4 compound are difficult to be condensed,
Mass fraction is relatively high.Through cooling 1.599% for absorbing oil gas total mass fraction and being reduced in l stream stock, it is not completely absorbed
Ingredient be mainly C4, C5, be absorbed oil gas and recycle.By stream stock n it is found that be discharged to air is N after adsorption recovery2
And O2, mass fraction accounts for 99.999%.Total oil gas mass fraction that accumulator tank is recycled to known to stream stock m is 99.334%, miscellaneous
The mass fraction of matter gas is only 0.666%, shows higher oil gas recovery rate.
Although the preferred embodiment of the present invention is described above in conjunction with attached drawing, the invention is not limited to upper
The specific embodiment stated, the above mentioned embodiment is only schematical, be not it is restrictive, this field it is common
Technical staff under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, may be used also
By make it is many in the form of specific transformation, within these are all belonged to the scope of protection of the present invention.
Claims (8)
1. a kind of integral type gas recovery system for oil, which is characterized in that including pressure surge tank, tail gas compression and preliminary condensation dress
It sets, oil-poor cooling absorption plant, adsorbent equipment, recyclable device；
The entrance of the pressure surge tank is connect with original oil gas by conveyance conduit, the outlet of the pressure surge tank with it is described
Tail gas compression is connected with the entrance of preliminary condensing unit；
The tail gas compression and preliminary condensing unit include three-stage blower and three-level condensing unit, and three-level condensing unit connects respectively
It is connected to the outlet of three-stage blower；Meanwhile the outlet of each condensing unit is connect with the accumulator tank in the recyclable device；
The oil-poor cooling absorption plant includes absorbing oily forecooler, the oily deep freezer of absorption and absorption tower, the absorption tower to be equipped with
Tower top feed inlet, tower bottom air inlet, tower top gas outlet and tower bottom liquid outlet；The entrance for absorbing oily forecooler is used for and outside
Fuel Tanking Unit connection, the outlet for absorbing oily forecooler are connect with the entrance for absorbing oily deep freezer, and the absorption oil is deep
The outlet of cooler is connect with the tower top feed inlet on the absorption tower, the tower bottom air inlet on the absorption tower and the tail gas compression and
The outlet connection of preliminary condensing unit, the tower top gas outlet on the absorption tower are connect with adsorbent equipment, the tower bottom on the absorption tower
The connection of the accumulator tank of liquid outlet and recyclable device；
The adsorbent equipment include the first adsorption tower, the second adsorption tower, nitrogen heater and vacuum pump, first adsorption tower and
The tower bottom of second adsorption tower is connect with the tower top gas outlet on the absorption tower, and first adsorption tower and described second is inhaled
The top discharge mouth of attached tower is communicated with the atmosphere；Meanwhile the tower top of first adsorption tower and second adsorption tower is and nitrogen
The outlet of heater connects, and the entrance of the nitrogen heater is connect with source nitrogen；First adsorption tower and described second is inhaled
The tower bottom of attached tower is connect with the entrance of the vacuum pump, and the outlet of the vacuum pump connects with the entrance of the pressure surge tank
It connects；
The recyclable device includes accumulator tank and oil recovery blowback receiving apparatus includes accumulator tank and recycles oil pump, the accumulator tank
The entrance of the outlet connection recycling oil pump.
2. a kind of integral type gas recovery system for oil according to claim 1, which is characterized in that the absorption tower uses stainless
Steel wire structured packing or stainless steel random packing, and be provided with liquid in absorption tower and spray device, which sprays dress
Set installation tower inner top region.
3. a kind of integral type gas recovery system for oil according to claim 1, which is characterized in that first adsorption tower and institute
The tower top for stating the second adsorption tower is communicated with the atmosphere by fire arrester.
4. a kind of integral type gas recovery system for oil according to claim 1, which is characterized in that the PLC program controls institute
It states the first adsorption tower and second adsorption tower and automatically switches work, when first adsorption tower carries out adsorption process, described the
The regenerative process that two adsorption towers are inversely vented, are vacuumized, nitrogen purging, boost；Second adsorption tower adsorbed
Cheng Shi, the regenerative process that first adsorption tower is inversely vented, is vacuumized, nitrogen purging, boost.
5. a kind of integral type gas recovery system for oil according to claim 1, which is characterized in that the vacuum pump is provided with side
Road protection.
6. a kind of integral type gas recovery system for oil according to claim 1, which is characterized in that the recycling oil pump uses nothing
Leakage shielding pump.
7. a kind of recovery process using the integral type gas recovery system for oil as described in any one of claim 1-6, feature exist
In progress in accordance with the following steps:
(1) original oil gas is delivered to the pressure surge tank, then is delivered to the tail gas compression and preliminary condensing unit, by institute
State compressor compresses；The outlet of every grade of compressor all carries out circulating water, low to control the compressor outlet delivery temperature
In 65 degree；Oil gas temperature after three stage compression and three-level condensation is lower than 35 degree, enters the absorption by the tower bottom air inlet
Tower, moisture and high boiling component, which are largely condensed, is delivered to the accumulator tank；
(2) the oil-poor cooling absorption plant uses No. 93 gasoline, by the pre-cooling and the absorption for absorbing oily forecooler
After the depth of oily deep freezer is cooling, until -35 degree enter the absorption tower by the tower top feed inlet, by leaching at the top of the absorption tower
Spray apparatus carries out low temperature and sprays, and the oil gas after spray-absorption is delivered to the accumulator tank with gasoline, described in residual exhaust warp
The tower top gas outlet on absorption tower enters the adsorbent equipment.
(3) tail gas enters the first adsorption tower by tower bottom or the second adsorption tower is adsorbed, and the tail gas after absorption is by the first absorption
Tower or the second adsorption tower top discharge mouth drain into atmosphere, and the hydrocarbon component being adsorbed then is recycled to pressure by Vacuum Heat parsing
Surge tank.
8. a kind of recovery process of integral type gas recovery system for oil according to claim 7, which is characterized in that the step
(3) when the adsorbance of the first adsorption tower described in reaches design value, PLC program control switches to second adsorption tower and enters suction
Attached process, while controlling the first adsorption tower and entering regenerative process；When the adsorbance of second adsorption tower reaches design value, PLC
Process control switches to first adsorption tower and enters adsorption process, while controlling the second adsorption tower and entering regenerative process, so
It moves in circles.
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| CN111151099A (en) * | 2020-02-28 | 2020-05-15 | 天津格林泰格科技有限公司 | Oil gas low-temperature absorption process method |
| CN111575043A (en) * | 2020-06-11 | 2020-08-25 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | Oil-gas separation and recovery system and recovery method |
| CN111575042A (en) * | 2020-06-11 | 2020-08-25 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | Combined oil gas recovery device and recovery process |
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| CN113908663A (en) * | 2021-09-13 | 2022-01-11 | 常州大学 | Pressurized multistage absorption, condensation and adsorption module combined organic waste gas recovery method |
| CN113908663B (en) * | 2021-09-13 | 2023-08-29 | 常州大学 | Pressurized multistage 'absorption, condensation and adsorption' module combined organic waste gas recovery method |
| CN114053842A (en) * | 2021-10-29 | 2022-02-18 | 青岛诺诚化学品安全科技有限公司 | Recovery system and method for dissipated flue gas in liquid asphalt loading process |
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