CN106310699A - Recovery system and recovery method for oil gas absorbed and desorbed by asymmetric double pots - Google Patents
Recovery system and recovery method for oil gas absorbed and desorbed by asymmetric double pots Download PDFInfo
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- CN106310699A CN106310699A CN201610963103.7A CN201610963103A CN106310699A CN 106310699 A CN106310699 A CN 106310699A CN 201610963103 A CN201610963103 A CN 201610963103A CN 106310699 A CN106310699 A CN 106310699A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with 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
- B01D53/002—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
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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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
- B01D2259/40001—Methods relating to additional, e.g. intermediate, treatment of process 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
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
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- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Separation Of Gases By Adsorption (AREA)
Abstract
The invention discloses a recovery system and a recovery method for an oil gas absorbed and desorbed by asymmetric double pots. The recovery system comprises a first stop valve, a first-level oil gas condenser, a second-level oil gas condenser, a second stop valve, a first-level big activated carbon canister and a third stop valve, wherein an oil gas inlet is connected with one end of the first stop valve; a positive input end of the first-level oil gas condenser is connected with the other end of the first stop valve; a positive output end of the first-level oil gas condenser is connected with an input end of the second-level oil gas condenser; an output end of the second-level oil gas condenser is connected with a negative input end of the first-level oil gas condenser; a negative output end of the first-level oil gas condenser is connected with one end of the second stop valve; the other end of the second stop valve is connected with one end of the first-level big activated carbon canister; one end of the third stop valve is connected with the other end of the first-level big activated carbon canister; the other end of the third stop valve is connected with a first oil gas outlet; the first stop valve, the first-level oil gas condenser, the second-level oil gas condenser, the first-level oil gas condenser, the second stop valve, the first-level big activated carbon canister and the third stop valve are successively connected and form an oil gas recycling subsystem.
Description
Technical field
The present invention relates to oil-gas recovery device field, particularly to the gas recovery system for oil of a kind of asymmetric pair of tank adsorption desorption
And method.
Background technology
It is traditionally used for three petroleum vapor recovery or the oil-gas recovery device of oil depot, typically uses condensation-adsorption method, absorption
The techniques such as absorption process reclaim, and for condensation-adsorption method, use one-level～the condensation of multistage staged, make oil gas gradually phase transformation
Liquefaction separates, isolated gas concentration gradually step-down, discharges subsequently into consequent activities charcoal system adsorption cleaning.
Absorption is to use two groups of (being probably multiple tank is one group) adsorption tanks that volume is identical, and one of which adsorption tanks adsorb
Time, another organizes adsorption tanks vacuum pump desorption and regeneration, and an adsorption desorption cycle is generally 10～20 minutes, and one group of tank absorption is complete
Time, another group tank is also desorbed complete, is then respectively organized the adsorption desorption state of tank, such alternate cycles by valve transfer.
With reference to accompanying drawing 1, its principle process is as follows:
After pressure sensitive device 17 senses that entrance starts pressure, high-concentration oil vapor introduces primary oil air cooling through air-introduced machine 1
Condenser 2 is lowered the temperature, if there being phase-change liquid to be brought out, gas part sequentially enter 3, three grades of oil-gas condensers 4 of two grades of oil-gas condensers,
Level Four oil-gas condenser 5, the liquid portion of phase transformation is brought out.Oil gas is condensed and obtains preliminary purification, the oil gas of residue low concentration
Entering the first absorbent charcoal adsorption tank 14 by valve 6, purified gas is discharged by valve 12 again；
When the first absorbent charcoal adsorption tank 14 is when adsorbing, the second absorbent charcoal adsorption tank 15 is regenerating simultaneously, this
Time vacuum pump 16 start, valve 9 is opened, and the second absorbent charcoal adsorption tank 15 is carried out evacuation, the second absorbent charcoal adsorption tank 15 it
The oil gas of front absorption is desorbed out under vacuo, and desorption high-concentration oil vapor out is again introduced into two grades of oil-gas condensers 3 and draws
The air-fuel mixture that blower fan 1 introduces, and condense step by step, uncooled gas part enters back into another and organizes the first absorbent charcoal adsorption tank 14
Absorption.
At the end of the second absorbent charcoal adsorption tank 15 evacuation is fast, valve 11 is opened, in the second absorbent charcoal adsorption tank 15
Activated carbon purge further, balance the pressure of the second absorbent charcoal adsorption tank 15 simultaneously, be allowed to meet absorption phase next time
Requirement.
Because the gas that vacuum pump 16 is extracted out has certain pressure, the existence of air-introduced machine 1, on the one hand make high-concentration oil vapor energy
Enough introducing equipment, the pressure that when will not be desorbed because of vacuum pump, outlet produces simultaneously makes high-concentration oil vapor not enter.To ensure
The continuous operation of equipment.
But for the oil gas treating device of gas station, exhaust of oil during main treatment trough tank car emptying is (once
Petroleum vapor recovery) and buried pressure tank raise the exhaust of oil (three petroleum vapor recovery) that causes, need to process during a petroleum vapor recovery
Oil gas flow is very big, reaches 30～60m3/h, and the oil gas flow that three petroleum vapor recovery need to process is the least, only 1～
5m3/h。
Existing gas station oil gas processing means, the general exhaust of oil caused that only raises buried pressure tank has been carried out time
Receiving, and oil gas during emptying uses the mode of VLE, make oil gas be directly entered groove tank car, groove tank car is re-filled with oil gas and arrives
Oil depot goes concentration to carry out petroleum vapor recovery.
Filling the groove tank car of oil gas when carrying out charge of oil next time to oil depot, the liquid oil of oil depot loads groove tank car, gas quilt
Introduce after oil depot oil-gas recovery device collection process reaches environmental protection standard and discharge.
Gas recovery system for oil of gas station and the oil-gas recovery device of oil depot are all that state compulsion requires to be equipped with,
But during according to above flow process practical operation, the oil-gas recovery device of oil depot usually can not be recovered to from the oil gas of groove tank car
Oil, or the oil than theoretical value much less can only be recovered to.
Trace it to its cause, have following several possible:
1. the groove tank car of gas station is after emptying terminates, and whether some gas station operator need hand inspection groove tank car
Unsnatching, and open the top cover of groove tank car, in causing groove tank car, oil gas is released into air；
2. arrive gas station to transport the groove tank car of oil and may draw gasoline today, remove and change into drawing diesel oil tomorrow to oil depot, and oil depot
To the diesel oil trestle work of groove tank car charge of oil, (petroleum vapor recovery to diesel oil, country does not the most force the most not to fill oil-gas recovery device
Require), thus cause the petrol gas in groove tank car to run in vain into air；
3. groove tank car is not airtight tight, and gas is more easy to owing to the change of temperature causes the drastically change of volume, groove tank than liquid
Oil gas in car can make groove tank car internal pressure increase due to variations in temperature, a lot of groove tank car caping, detects the close of the positions such as mouth
Closing property is the most tight, and groove tank car hauls car load oil gas streetful and runs, and when next time to oil depot charge of oil, may the most significantly subtract by internal oil gas
Few；
4. a lot of groove tank cars also do not download the transformation of oil, and top charge of oil mouth is not of uniform size, and oil depot oil filling riser is not
Can groove tank car tank mouth be carried out the most airtight, cause the oil-gas recovery device of oil depot to be collected less than high-concentration oil vapor, affect oil depot
The yield of oil-gas recovery device.
For these reasons, if petroleum vapor recovery can directly be carried out when gas station's groove tank car emptying, high-concentration oil vapor is straight
Connect and become gasoline, on the one hand can increase gas station's benefit, be on the other hand conducive to environmental protection, change the oil gas in present groove tank car
At oil depot delay disposal far from the present situation reaching desired effect.
For this reason, it is necessary to first say down that secondary oil gas reclaims and three petroleum vapor recovery, secondary oil gas reclaims Ji Shi gas station and exists
When refueling a car, the oil gas in automotive oil tank and the oil gas volatilized that refuels, from the gas circuit pipe of petroleum vapor recovery nozzle, by vacuum
Pumping returns buried tank (buried tank).
The oil gas of fuel tank volatilization exists escapes, and must suck back some guarantee oil gas more and try one's best few when reclaiming oil gas
Escaping, thus have partial air and be drawn back into, its vapour-liquid ratio of national regulations is generally 1～1.2:1 (volume ratio).Owing to sucking back
Oil gas more than to automobile add oil volume, the pressure of buried tank can gradually rise, and height breather valve to a certain extent will be beaten
Using pungent drugs for dispersion and bitter drugs for purgation pressure, makes exhaust of oil in air, and when temperature step-down, in buried tank, gas volume reduces, pressure step-down, causes exhaling
Inhale valve and open suction air, balance the pressure of buried tank.This is also " the little breathing " being commonly called as.
So, buried tank, will be to environment when breathing out oil gas, now, is necessary for installing as oil depot oil gas
Reclaimer can make the equipment of oil gas qualified discharge like that rather than only carry out VLE.Such equipment and reclaiming
Journey is referred to as three petroleum vapor recovery of gas station.
Three petroleum vapor recovery of gas station are to solve buried tank owing to sucking gas when variations in temperature or secondary recovery
Emission problem when causing pressure to raise, general treating capacity is the least, between 1NM3/h～5NM3/h.
And during gas station's emptying, a general groove tank car volume is 30～60 cubic metres, whole emptying process is typically one
Completing about hour, the oil and gas content i.e. produced is about 30～60Nm3/h, if therefore oil gas returns as three times to gas station's emptying fashionable dress
Receive such equipment, need 30 to amplify about 30 times in other words and could meet the requirement that petroleum vapor recovery processes, it is clear that this is not
Economical, therefore, except every day can reach the gas station of more than 3 cars by emptying, some gas station owners for economic benefit, upper mistake
Outside oil-gas recovery processing device as the petroleum vapor recovery of three petroleum vapor recovery or oil depot, there is presently no people specially to adding
Petroleum vapor recovery during petrol station emptying is optimized design.
For the gas station in the whole nation more than 90%, its every day, or every couple of days only one of which groove tank car emptying, often
Secondary emptying about one hour, like this, as a example by the petroleum vapor recovery processing equipment filling a set for the treatment of capacity 50Nm3/h, market
Valency is about 30～600,000, even if emptying can reclaim the oil of about 200 yuan every time, the cycle of its cost recovery is also very
Long.The interval time every time used due to gas station oil gas reclaimer is the longest, if gas station oil gas reclaimer is direct
Use traditional double group activated carbons to replace the technique of adsorption desorption, every 24～72 hours may only have one hour the most at full capacity
Using, other overwhelming majority times are the most idle, and the utilization rate of adsorption desorption system is the lowest undoubtedly.
The present invention, by the adsorption desorption technique of 10～20 minutes traditional alternate runs, changes into adsorbing completely during emptying, emptying
After according to buried pressure tank interval desorption oil-gas recovery method, reduce the fill total amount of activated carbon, particularly reduce
The rate of air sucked in required of vacuum pump, to greatly reduce one-time investment cost, thus promotes pushing away of gas station's emptying oil-gas recovery device
Extensively.
It is illustrated in figure 2 one time, the gas station of the prior art petroleum vapor recovery (petroleum vapor recovery loading onto in present patent application
Before equipment) connection diagram, an existing petroleum vapor recovery main emptying process: during RTC unloading, close stop valve V1, beat
Opening stop valve V3 and stop valve V5, liquid oil flows into buried tank through stop valve V5, and the oil gas in buried tank passes through stop valve
V3 returns oil truck.
Summary of the invention
In order to overcome deficiency of the prior art, the present invention provides the gas recovery system for oil of a kind of asymmetric pair of tank adsorption desorption
And method, there is simple in construction, floor space is little, cost of investment is low, safety coefficient is high and the feature such as environmental protection.
In order to reach foregoing invention purpose, solve the technical scheme that its technical problem used as follows:
The invention discloses the gas recovery system for oil of a kind of asymmetric pair of tank adsorption desorption, be used for reclaiming buried tank or storage tank is waved
The oil gas produced during sending out process and emptying, including the first stop valve, primary oil gas condenser, two grades of oil-gas condensers, the
The big charcoal canister of two stop valves, one-level and the 3rd stop valve, wherein:
One end of described first stop valve connects oil and gas import, and the forward that the other end connects described primary oil gas condenser is defeated
Enter end；
The forward outfan of described primary oil gas condenser connects the input of described two grades of oil-gas condensers；
The outfan of described two grades of oil-gas condensers connects the reverse input end of described primary oil gas condenser；
The inverse output terminal of described primary oil gas condenser connects one end of described second stop valve, described second stop valve
The other end connect the big charcoal canister of described one-level one end；
One end of described 3rd stop valve connects the other end of the big charcoal canister of described one-level, and the other end connects the first oil gas
Outlet；
Described first stop valve, primary oil gas condenser, two grades of oil-gas condensers, primary oil gas condenser, second cut-outs
The big charcoal canister of valve, one-level and the 3rd stop valve are sequentially connected formation one petroleum vapor recovery subsystem.
Further, described two grades of oil-gas condensers use shell-and-tube, board-like or fin-tube type structure.
Further, system also includes that a refrigerating plant, described refrigerating plant are connected with described two grades of oil-gas condensers, uses
In described two grades of oil-gas condensers are freezed.
One embodiment, system also includes vacuum pump, pressure maintenance device and the 4th stop valve, wherein:
One end of the import of described vacuum pump charcoal canister big with described one-level is connected, vacuum delivery side of pump and described one-level
The positive input of oil-gas condenser connects；
One end of described pressure maintenance device reverse with described second stop valve and described primary oil gas condenser simultaneously
Outfan connects, and the other end is connected with one end of described 4th stop valve；
The other end of described 4th stop valve connects the second oil gas vent；
The big charcoal canister of described one-level, vacuum pump, primary oil gas condenser, two grades of oil-gas condensers, one-level oil gas condensations
Device, pressure maintenance device and the 4th stop valve are sequentially connected formation the first regenerating active carbon subsystem.
Another embodiment, system also includes vacuum pump, pressure maintenance device, the 4th stop valve, the 5th stop valve and two
The little charcoal canister of level, wherein:
One end of the import of described vacuum pump charcoal canister big with described one-level is connected, vacuum delivery side of pump and described one-level
The positive input of oil-gas condenser connects；
One end of described pressure maintenance device reverse with described second stop valve and described primary oil gas condenser simultaneously
Outfan connects, and the other end is connected with one end of described 4th stop valve；
The other end of one end charcoal canister big with described one-level of described 5th stop valve is connected, and the other end is simultaneously with described
One end of 4th stop valve and two grades of little charcoal canisters is connected；
The other end of described two grades of little charcoal canisters is connected with one end of described 3rd stop valve；
The big charcoal canister of described one-level, vacuum pump, primary oil gas condenser, two grades of oil-gas condensers, one-level oil gas condensations
Device, pressure maintenance device, the 4th stop valve, two grades of little charcoal canisters and the 3rd stop valve are sequentially connected formation the second activated carbon again
Raw subsystem.
Further, the volume of described two grades of little charcoal canisters is between 0.1L～100L.
Preferably, the volume of described two grades of little charcoal canisters is between 1L～20L.
Further, described pressure maintenance device is capillary tube, reducing, breather valve or regulation valve.
Further, system also includes that pressure sensitive device, described pressure sensitive device are arranged at oil and gas import, and with
Described first stop valve connects, in order to sense the pressure of buried tank and/or storage tank.
The present invention additionally discloses the oil-gas recovery method of a kind of asymmetric pair of tank adsorption desorption, utilizes oil gas described above
Recovery system carries out petroleum vapor recovery, and concrete steps include:
Step 1: the oil gas produced when unloading or during tinning, after the first stop valve, enters primary oil gas condenser, makes
Obtain temperature to be reduced between-10～+10 DEG C, and remove the most of moisture in oil gas；
Step 2: the oil gas of preliminary pre-cooling enters back into two grades of oil-gas condensers, and refrigerating plant exports to two grades of oil-gas condensers
Cold, makes oil gas temperature be reduced to-10～-80 DEG C, and the some hydrocarbon material in oil gas is condensed recovery, the gas of residue low temperature
Return again to primary oil gas condenser and carry out heat exchange with the high-temperature oil gas entering primary oil gas condenser through the first stop valve, reclaim
After cryogenic energy, enter the big charcoal canister of one-level through the second stop valve, intercept condensation phase could not the oil gas of phase transformation completely, cleaning
Oil gas enter tank car through the 3rd stop valve and the first oil gas vent, balance, with this, pressure of unloading；
Step 3: activated carbon canister big to one-level regenerates when not unloading or during non-tinning.
Further, step 3 specifically includes following steps 31:
After groove tanker vehicle unloading or tinning, activated carbon canister big to one-level regenerates, during regeneration, and refrigerating plant fortune as usual
OK, close the first stop valve, the second stop valve and the 3rd stop valve, start vacuum pump activated carbon canister big to one-level and take out very
Sky, the pumpdown time is set to 1-6 hour, makes regenerating active carbon, and the oil gas of activated carbon adsorption is extracted out by vacuum pump, enters one-level
Oil-gas condenser, part high-concentration oil vapor is condensed, and uncooled gas is partially into two grades of oil-gas condensers, overwhelming majority oil
Gas is condensed discharge, and small part remains uncooled gas part and maintains dress through pressure after primary oil gas condenser reclaims cold
Put, then discharge through the 4th stop valve, discharge gas and bury tank evacuated tube or chemical plant by the second oil gas vent and original place, gas station
Former storage tank evacuated tube connects, or is directly connected into buried tank or tank inside.
Further, after step 31 further comprising the steps of 32:
When the big activated carbon canister of one-level is just in regenerative process, it is arranged on the pressure sensing device senses at oil and gas import buried
Tank or pressure of storage tank are increased to the pressure that should process, then vacuum pump quits work, and open the first stop valve and the second stop valve, and one
After the big activated carbon canister pressure balance of level, then open the 3rd stop valve, after making buried tank or the complete pressure release of storage tank, then restart step
Rapid 31.
The invention also discloses the oil-gas recovery method of a kind of asymmetric pair of tank adsorption desorption, utilize oil gas described above to return
Receipts system carries out petroleum vapor recovery, and concrete steps include:
Step A: the oil gas produced when unloading or during tinning, after the first stop valve, enters primary oil gas condenser, makes
Obtain temperature to be reduced between-10～+10 DEG C, and remove the most of moisture in oil gas；
Step B: the oil gas of preliminary pre-cooling enters back into two grades of oil-gas condensers, and refrigerating plant exports to two grades of oil-gas condensers
Cold, makes oil gas temperature be reduced to-10～-80 DEG C, and the some hydrocarbon material in oil gas is condensed recovery, the gas of residue low temperature
Return again to primary oil gas condenser and carry out heat exchange with the high-temperature oil gas entering primary oil gas condenser through the first stop valve, reclaim
After cryogenic energy, enter the big charcoal canister of one-level through the second stop valve, intercept condensation phase could not the oil gas of phase transformation completely, cleaning
Oil gas through the 5th stop valve, then through two grades of little activated carbon canisters, the 3rd stop valve and the first oil gas vent be directly discharged into air or
Enter tank car and balance pressure of unloading；
Step C: activated carbon canister big to one-level regenerates when not unloading or when storage tank does not feeds.
Further, step C specifically includes following steps C1:
After groove tanker vehicle unloading or tinning, activated carbon canister big to one-level regenerates, during regeneration, and refrigerating plant fortune as usual
OK, close the first stop valve, the second stop valve and the 5th stop valve, start vacuum pump activated carbon canister big to one-level and take out very
Sky, the pumpdown time is set to 1-6 hour, makes regenerating active carbon, and the oil gas of activated carbon adsorption is extracted out by vacuum pump, enters one-level
Oil-gas condenser, part high-concentration oil vapor is condensed, and uncooled gas is partially into two grades of oil-gas condensers, overwhelming majority oil
Gas is condensed discharge, and small part remains uncooled gas part and maintains dress through pressure after primary oil gas condenser reclaims cold
Put, then drain into two grades of little activated carbon canisters of rear end through the 4th stop valve, after through the 3rd stop valve and the first oil gas vent by clean
Clean oil gas is discharged.
Further, step C1 specifically includes following steps C2:
When the big activated carbon canister of one-level is just in regenerative process, it is arranged on the pressure sensing device senses at oil and gas import buried
Tank or pressure of storage tank are increased to the pressure that should process, then vacuum pump quits work, and open the first stop valve, the 4th stop valve and
Five stop valves, buried tank or storage tank fill into the big activated carbon canister of one-level of partial vacuum, equilibrium adsorption through pressure maintenance device
Pressure tank, the most normally opens the second stop valve, the 5th stop valve and the 3rd stop valve, makes buried tank or the complete pressure release of storage tank
After, then restart step C1.
Further, the further comprising the steps of C3 of step C2:
After the big activated carbon canister of one-level has regenerated substantially, then open the 5th stop valve, close the 3rd stop valve and the 4th
Two grades of little activated carbon canisters are regenerated by stop valve, owing to two grades little activated carbon canister volumes are the least, so internal incoagulability gas
Body is little, by slightly elevated for the pressure in the whole space between vacuum pump outlet to the 4th stop valve, can offset this part not
The volume of solidifying property gas so that be not required to arrange special exhaust outlet when two grades of little charcoal canisters are regenerated.
Due to the fact that the above technical scheme of employing, be allowed to compared with prior art, have the following advantages that and actively imitate
Really:
1, in the present invention, the big charcoal canister of one-level can meet the needs of oil gas absorption of once unloading, and utilizes after disposable absorption
Activated carbon is slowly regenerated by the interval unloaded for twice, and the recovery time is long, and its vacuum pump rate of air sucked in required is little, can use 0.1～
The minipump of 10Nm3/h, has greatly saved one-time investment cost, and general 30～the oil-gas recovery device of 60Nm3/h
Often need to use the vacuum pump of 20～100Nm3/h, cost is high；
2, in the present invention, ownership device for cooling and electrical components all can use the civilian power supply of 220V, and gas station can be direct
Use；
3, tradition condensation adsorption-type oil-gas recovery device, when reclaiming an oil gas and three oil gas, its equipment takes up an area simultaneously
Area is big, generally 2～8 square metres；According to the occupation area of equipment after this technical flow design can be controlled in 1.5 square metres with
In, save this with regard to compact gas station's land used；
4, this technique is in addition to can be used for the unloading recovery of oil and three times and reclaim of gas station, it is also possible to store up for other similar mediums
The exhaust of oil of tank controls.After using, on each storage tank, this process unit being installed, it is possible to resolve tradition storage tank top gas recovery method
Middle all storage tanks are connected together, and then unified recovery discharges the storage tank blast that gas causes, and can involve other storage tanks
The technical problem of potential safety hazard；
5, the gas station oil gas reclaimer of conventional belt absorbing process, due to needs adsorption desorption alternate run, its vacuum pump
Rate of air sucked in required configuration very big, electric power is also big, and uses the vacuum pump of this technique, can be arranged to the least, save throwing
Money；
6, gas station is utilized to unload discontinuous feature, absorption when using activated carbon to unload, regenerate when not unloading, one big one
The mode of little two charcoal canister series connection, has the most singly reclaimed oil gas when unloading, and has made gas station's exhaust emissions concentration reach completely
Mark discharge；The activated carbon adsorption system increased, can meet up-to-date GB GB31571-2015 first non-to petro chemical industry completely
The rigors of alkane total appropriate hydrocarbon gas discharge 120mg/m3；
7, the condensation adsorption system of this technique is used, it is not necessary to utilize air-introduced machine pressurization to overcome as traditional handicraft true
Empty delivery side of pump pressure, saves investment.Use the gas recovery system for oil of this asymmetric formula adsorption desorption, be equivalent to tradition and inhale de-
The attached technique simultaneously exchanged, saves the usage amount of valve；
8, the least due to the second order activity canister of this technique, can directly use the internal filling of process pipe itself completely
Activated carbon substitutes, and traditional handicraft must use the charcoal canister of big particular design, therefore this technique saves manufacturing cost.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, required use in embodiment being described below
Accompanying drawing be briefly described.It is clear that the accompanying drawing in describing below is only some embodiments of the present invention, for ability
From the point of view of field technique personnel, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.Attached
In figure:
Fig. 1 is one time, gas station of the prior art oil-gas recovery device connection diagram；
[symbol description in Fig. 1] 1-air-introduced machine；2-primary oil gas condenser；Bis-grades of oil-gas condensers of 3-；Tri-grades of oil gas of 4-
Condenser；5-level Four oil-gas condenser；6-valve；7-valve；8-valve；9-valve；10-valve；11-valve；12-valve；
13-valve；14-the first absorbent charcoal adsorption tank；15-the second absorbent charcoal adsorption tank；16-vacuum pump；17-pressure sensitive device；
Fig. 2 is one time, gas station of the prior art oil-gas recovery device connection diagram；
Fig. 3 is the emptying connection diagram after loading onto asymmetric formula oil-gas recovery device in the present invention；
Fig. 4 is the overall structure schematic diagram of embodiment one asymmetric formula gas recovery system for oil in the present invention；
Fig. 5 is the overall structure schematic diagram of embodiment two asymmetric formula gas recovery system for oil in the present invention；
[primary symbols explanation in Fig. 3-5]
1-the first stop valve；2-primary oil gas condenser；Bis-grades of oil-gas condensers of 3-；4-the second stop valve；5-one-level is big
Charcoal canister；6-the 3rd stop valve；7-refrigerating plant；8-vacuum pump；9-pressure maintenance device；10-the 4th stop valve；11-presses
Power induction installation；12-the 5th stop valve；Bis-grades of little charcoal canisters of 13-；
Fig. 6 is the schematic flow sheet of embodiment three asymmetric formula oil-gas recovery method in the present invention；
Fig. 7 is the schematic flow sheet of embodiment four asymmetric formula oil-gas recovery method in the present invention.
Detailed description of the invention
Below with reference to the accompanying drawing of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete description
And discussion, it is clear that a part of example of the only present invention as described herein, is not whole examples, based on the present invention
In embodiment, the every other enforcement that those of ordinary skill in the art are obtained on the premise of not making creative work
Example, broadly falls into protection scope of the present invention.
As it is shown on figure 3, load onto the main emptying process after asymmetric formula oil-gas recovery device: during RTC unloading, close
Stop valve V1 and V6, opens stop valve V3 and V5, and liquid oil flows into buried tank through stop valve V5, and the oil gas in buried tank is first
After entering asymmetric formula device for recovering oil and gas by stop valve V2, the tail gas after process returns oil truck by stop valve V3.
The liquid reclaimed periodically puts into buried tank by stop valve V4.
Emptying is complete, closes stop valve V3 and V5, opens stop valve V6, and oil-gas recovery device reverts to process buried tank
" little breathing " discharges.
Embodiment one
As shown in Figure 4, the invention discloses the gas recovery system for oil of a kind of asymmetric pair of tank adsorption desorption, be used for reclaiming buried
The oil gas produced during tank or storage tank volatilization process and emptying, including the first stop valve 1,2, two grades of oil of primary oil gas condenser
Gas condenser the 3, second stop valve 4, the big charcoal canister of one-level 5 and the 3rd stop valve 6, wherein:
One end of described first stop valve 1 connects oil and gas import, and the other end connects the forward of described primary oil gas condenser 2
Input；The forward outfan of described primary oil gas condenser 2 connects the input of described two grades of oil-gas condensers 3；Described two
The outfan of level oil-gas condenser 3 connects the reverse input end of described primary oil gas condenser 2；Described primary oil gas condenser 2
Inverse output terminal connect one end of described second stop valve 4, the other end of described second stop valve 4 connects described one-level Radix Angelicae Dahuricae (Radix Heraclei Scabridi)
One end of property canister 5；One end of described 3rd stop valve 6 connects the other end of the big charcoal canister of described one-level 5, and the other end connects
First oil gas vent.Described first stop valve 1,2, two grades of oil-gas condensers 3 of primary oil gas condenser, primary oil gas condenser 2,
Second stop valve 4, the big charcoal canister of one-level 5 and the 3rd stop valve 6 are sequentially connected formation one petroleum vapor recovery subsystem.
Further, described two grades of oil-gas condensers 3 use shell-and-tube, board-like or fin-tube type structure.
With continued reference to Fig. 4, system also includes a refrigerating plant 7, described refrigerating plant 7 and described two grades of oil-gas condensers 3
It is connected, for described two grades of oil-gas condensers 3 are freezed.In the present embodiment, described refrigerating plant 7 can use machine
Cold, pulse tube refrigeration or thermoacoustic refrigeration.
Additionally, system also includes vacuum pump 8, pressure maintenance device 9 and the 4th stop valve 10, wherein:
One end of the import charcoal canister big with described one-level 5 of described vacuum pump 8 is connected, and the outlet of vacuum pump 8 is with described
The positive input of primary oil gas condenser 2 connects；
One end of described pressure maintenance device 9 anti-with described second stop valve 4 and described primary oil gas condenser 2 simultaneously
Connecting to outfan, the other end is connected with one end of described 4th stop valve 10；
The other end of described 4th stop valve 10 connects the second oil gas vent；
The big charcoal canister of described one-level 5, vacuum pump 8, primary oil gas condenser 2, two grades of oil-gas condensers 3, one-level oil gas
Condenser 2, pressure maintenance device 9 and the 4th stop valve 10 are sequentially connected formation the first regenerating active carbon subsystem.
In the present embodiment, described pressure maintenance device 9 is capillary tube, reducing, breather valve or regulation valve.Other embodiments
In, the 4th stop valve 10 that bore can be used little substitutes pressure maintenance device 9, improves the condensation within two grades of oil-gas condensers
Pressure.
Preferably, system also includes that pressure sensitive device 11, described pressure sensitive device 11 are arranged at oil and gas import, and
It is connected with described first stop valve 1, in order to sense the pressure of buried tank and/or storage tank.
Embodiment two
As it is shown in figure 5, the present embodiment is in place of the gas recovery system for oil difference described in embodiment one, system is except bag
Include outside vacuum pump 8, pressure maintenance device the 9, the 4th stop valve 10, also include the 5th stop valve 12 and two grades of little charcoal canisters
13, wherein:
One end of the import charcoal canister big with described one-level 5 of described vacuum pump 8 is connected, and the outlet of vacuum pump 8 is with described
The positive input of primary oil gas condenser 2 connects；
One end of described pressure maintenance device 9 anti-with described second stop valve 4 and described primary oil gas condenser 2 simultaneously
Connecting to outfan, the other end is connected with one end of described 4th stop valve 10；
The other end of one end charcoal canister big with described one-level 5 of described 5th stop valve 12 is connected, the other end simultaneously with
Described 4th stop valve 10 is connected with one end of two grades little charcoal canisters 13；
The other end of described two grades little charcoal canisters 13 is connected with one end of described 3rd stop valve 6；
The big charcoal canister of described one-level 5, vacuum pump 8, primary oil gas condenser 2, two grades of oil-gas condensers 3, one-level oil gas
Condenser 2,10, two grades little charcoal canisters 13 of pressure maintenance device the 9, the 4th stop valve and the 3rd stop valve 6 are sequentially connected formation
Second regenerating active carbon subsystem.
Further, the volume of described two grades little charcoal canisters 13 is between 0.1L～100L.Preferably, described two grades little
The volume of charcoal canister 13 is between 1L～20L.Owing to two grades little charcoal canisters 13 are the least, in certain embodiments, it is possible to
Directly to replace with oil and gas pipes filling activated carbon.
Embodiment three
As shown in Figure 6, the present invention additionally discloses the oil-gas recovery method of a kind of asymmetric pair of tank adsorption desorption, utilizes and implements
Gas recovery system for oil described in example one carries out petroleum vapor recovery, and concrete steps include:
Step 1: the oil gas produced when unloading or during tinning, after the first stop valve, enters primary oil gas condenser, makes
Obtain temperature to be reduced between-10～+10 DEG C, and remove the most of moisture in oil gas；
Step 2: the oil gas of preliminary pre-cooling enters back into two grades of oil-gas condensers, and refrigerating plant exports to two grades of oil-gas condensers
Cold, makes oil gas temperature be reduced to-10～-80 DEG C, and the some hydrocarbon material in oil gas is condensed recovery, the gas of residue low temperature
Return again to primary oil gas condenser and carry out heat exchange with the high-temperature oil gas entering primary oil gas condenser through the first stop valve, reclaim
After cryogenic energy, enter the big charcoal canister of one-level through the second stop valve, intercept condensation phase could not the oil gas of phase transformation completely, cleaning
Oil gas enter tank car through the 3rd stop valve and the first oil gas vent, balance, with this, pressure of unloading；
Step 3: activated carbon canister big to one-level regenerates when not unloading or during non-tinning.
Further, step 3 specifically includes following steps 31:
After groove tanker vehicle unloading, activated carbon canister big to one-level regenerates, and during regeneration, refrigerating plant runs as usual, closes
First stop valve, the second stop valve and the 3rd stop valve, start vacuum pump activated carbon canister big to one-level and carry out evacuation, evacuation
Set of time is 1-6 hour, makes regenerating active carbon, and the oil gas of activated carbon adsorption is extracted out by vacuum pump, enters one-level oil gas condensation
Device, part high-concentration oil vapor is condensed, and uncooled gas is partially into two grades of oil-gas condensers, and overwhelming majority oil gas is condensed
Discharging, small part remains uncooled gas part after primary oil gas condenser reclaims cold through pressure maintenance device, then warp
4th stop valve is discharged, and discharges gas and buries tank evacuated tube or chemical plant former storage tank row by the second oil gas vent and original place, gas station
Blank pipe connects, or is directly connected into buried tank or tank inside.
Further, after step 31 further comprising the steps of 32:
When the big activated carbon canister of one-level is just in regenerative process, it is arranged on the pressure sensing device senses at oil and gas import buried
Tank or pressure of storage tank are increased to the pressure that should process, then vacuum pump quits work, and open the first stop valve and the second stop valve, and one
After the big activated carbon canister pressure balance of level, then open the 3rd stop valve, after making buried tank or the complete pressure release of storage tank, then restart step
Rapid 31.
Embodiment four
As it is shown in fig. 7, the invention also discloses the oil-gas recovery method of a kind of asymmetric pair of tank adsorption desorption, utilize embodiment
Gas recovery system for oil described in two carries out petroleum vapor recovery, and concrete steps include:
Step A: the oil gas produced when unloading or during tinning, after the first stop valve, enters primary oil gas condenser, makes
Obtain temperature to be reduced between-10～+10 DEG C, and remove the most of moisture in oil gas；
Step B: the oil gas of preliminary pre-cooling enters back into two grades of oil-gas condensers, and refrigerating plant exports to two grades of oil-gas condensers
Cold, makes oil gas temperature be reduced to-10～-80 DEG C, and the some hydrocarbon material in oil gas is condensed recovery, the gas of residue low temperature
Return again to primary oil gas condenser and carry out heat exchange with the high-temperature oil gas entering primary oil gas condenser through the first stop valve, reclaim
After cryogenic energy, enter the big charcoal canister of one-level through the second stop valve, intercept condensation phase could not the oil gas of phase transformation completely, cleaning
Oil gas through the 5th stop valve, then through two grades of little activated carbon canisters, the 3rd stop valve and the first oil gas vent be directly discharged into air or
Enter tank car and balance pressure of unloading；
Step C: activated carbon canister big to one-level regenerates when not unloading or when storage tank does not feeds.
Further, step C specifically includes following steps C1:
After groove tanker vehicle unloading or tinning, activated carbon canister big to one-level regenerates, during regeneration, and refrigerating plant fortune as usual
OK, close the first stop valve, the second stop valve and the 5th stop valve, start vacuum pump activated carbon canister big to one-level and take out very
Sky, the pumpdown time is set to 1-6 hour, makes regenerating active carbon, and the oil gas of activated carbon adsorption is extracted out by vacuum pump, enters one-level
Oil-gas condenser, part high-concentration oil vapor is condensed, and uncooled gas is partially into two grades of oil-gas condensers, overwhelming majority oil
Gas is condensed discharge, and small part remains uncooled gas part and maintains dress through pressure after primary oil gas condenser reclaims cold
Put, then drain into two grades of little activated carbon canisters of rear end through the 4th stop valve, after through the 3rd stop valve and the first oil gas vent by clean
Clean oil gas is discharged.
Further, step C1 specifically includes following steps C2:
When the big activated carbon canister of one-level is just in regenerative process, it is arranged on the pressure sensing device senses at oil and gas import buried
Tank or pressure of storage tank are increased to the pressure that should process, then vacuum pump quits work, and open the first stop valve, the 4th stop valve and
Five stop valves, buried tank or storage tank fill into the big activated carbon canister of one-level of partial vacuum, equilibrium adsorption through pressure maintenance device
Pressure tank, the most normally opens the second stop valve, the 5th stop valve and the 3rd stop valve, makes buried tank or the complete pressure release of storage tank
After, then restart step C1.
Further, the further comprising the steps of C3 of step C2:
After the big activated carbon canister of one-level has regenerated substantially, then open the 5th stop valve, close the 3rd stop valve and the 4th
Two grades of little activated carbon canisters are regenerated by stop valve, owing to two grades little activated carbon canister volumes are the least, so internal incoagulability gas
Body is little, by slightly elevated for the pressure in the whole space between vacuum pump outlet to the 4th stop valve, can offset this part not
The volume of solidifying property gas so that be not required to arrange special exhaust outlet when two grades of little charcoal canisters are regenerated.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art in the technical scope that the invention discloses, the change that can readily occur in or replacement,
All should contain within protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is as the criterion.
Claims (16)
1. a gas recovery system for oil for asymmetric pair of tank adsorption desorption, is used for reclaiming buried tank or storage tank volatilization process and emptying mistake
The oil gas produced in journey, it is characterised in that include the first stop valve, primary oil gas condenser, two grades of oil-gas condensers, second cut
Disconnected valve, the big charcoal canister of one-level and the 3rd stop valve, wherein:
One end of described first stop valve connects oil and gas import, and the other end connects the forward input of described primary oil gas condenser
End；
The forward outfan of described primary oil gas condenser connects the input of described two grades of oil-gas condensers；
The outfan of described two grades of oil-gas condensers connects the reverse input end of described primary oil gas condenser；
The inverse output terminal of described primary oil gas condenser connects one end of described second stop valve, described second stop valve another
One end connects one end of the big charcoal canister of described one-level；
One end of described 3rd stop valve connects the other end of the big charcoal canister of described one-level, and the other end connects the first oil gas and goes out
Mouthful；
Described first stop valve, primary oil gas condenser, two grades of oil-gas condensers, primary oil gas condenser, the second stop valve, one
The big charcoal canister of level and the 3rd stop valve are sequentially connected formation one petroleum vapor recovery subsystem.
The gas recovery system for oil of a kind of asymmetric pair of tank adsorption desorption the most according to claim 1, it is characterised in that described two
Level oil-gas condenser uses shell-and-tube, board-like or fin-tube type structure.
The gas recovery system for oil of a kind of asymmetric pair of tank adsorption desorption the most according to claim 2, it is characterised in that system is also
Including a refrigerating plant, described refrigerating plant is connected with described two grades of oil-gas condensers, for described two grades of oil-gas condensers
Freeze.
The gas recovery system for oil of a kind of asymmetric pair of tank adsorption desorption the most according to claim 3, it is characterised in that system is also
Including vacuum pump, pressure maintenance device and the 4th stop valve, wherein:
One end of the import of described vacuum pump charcoal canister big with described one-level is connected, vacuum delivery side of pump and described one-level oil gas
The positive input of condenser connects；
One end of described pressure maintenance device exports with described second stop valve and the reverse of described primary oil gas condenser simultaneously
End connects, and the other end is connected with one end of described 4th stop valve；
The other end of described 4th stop valve connects the second oil gas vent；
The big charcoal canister of described one-level, vacuum pump, primary oil gas condenser, two grades of oil-gas condensers, primary oil gas condenser, pressures
Power maintains device and the 4th stop valve to be sequentially connected formation the first regenerating active carbon subsystem.
The gas recovery system for oil of a kind of asymmetric pair of tank adsorption desorption the most according to claim 3, it is characterised in that system is also
Including vacuum pump, pressure maintenance device, the 4th stop valve, the 5th stop valve and two grades of little charcoal canisters, wherein:
One end of the import of described vacuum pump charcoal canister big with described one-level is connected, vacuum delivery side of pump and described one-level oil gas
The positive input of condenser connects；
One end of described pressure maintenance device exports with described second stop valve and the reverse of described primary oil gas condenser simultaneously
End connects, and the other end is connected with one end of described 4th stop valve；
The other end of one end charcoal canister big with described one-level of described 5th stop valve is connected, and the other end is simultaneously with the described 4th
One end of stop valve and two grades of little charcoal canisters is connected；
The other end of described two grades of little charcoal canisters is connected with one end of described 3rd stop valve；
The big charcoal canister of described one-level, vacuum pump, primary oil gas condenser, two grades of oil-gas condensers, primary oil gas condenser, pressures
Power maintains device, the 4th stop valve, two grades of little charcoal canisters and the 3rd stop valve to be sequentially connected formation the second regenerating active carbon
System.
The gas recovery system for oil of a kind of asymmetric pair of tank adsorption desorption the most according to claim 5, it is characterised in that described two
The volume of the little charcoal canister of level is between 0.1L～100L.
The gas recovery system for oil of a kind of asymmetric pair of tank adsorption desorption the most according to claim 6, it is characterised in that described two
The volume of the little charcoal canister of level is between 1L～20L.
8. according to the gas recovery system for oil of a kind of asymmetric pair of tank adsorption desorption described in claim 4 or 5, it is characterised in that
Described pressure maintenance device is capillary tube, reducing, breather valve or regulation valve.
The gas recovery system for oil of a kind of asymmetric pair of tank adsorption desorption the most according to claim 1, it is characterised in that system is also
Including pressure sensitive device, described pressure sensitive device is arranged at oil and gas import, and is connected with described first stop valve, in order to
Sense the pressure of buried tank and/or storage tank.
10. the oil-gas recovery method of an asymmetric pair of tank adsorption desorption, it is characterised in that utilize oil as claimed in claim 4
Gas recovery system carries out petroleum vapor recovery, and concrete steps include:
Step 1: the oil gas produced when unloading or during tinning, after the first stop valve, enters primary oil gas condenser so that temperature
Degree is reduced between-10～+10 DEG C, and removes the most of moisture in oil gas；
Step 2: the oil gas of preliminary pre-cooling enters back into two grades of oil-gas condensers, refrigerating plant is cold to two grades of oil-gas condenser outputs
Amount, makes oil gas temperature be reduced to-10～-80 DEG C, and the some hydrocarbon material in oil gas is condensed recoverys, remains the gas of low temperature again
Return primary oil gas condenser and carry out heat exchange with the high-temperature oil gas entering primary oil gas condenser through the first stop valve, reclaim low
After temperature energy, enter the big charcoal canister of one-level through the second stop valve, intercept condensation phase could not the oil gas of phase transformation completely, cleaning
Oil gas enters tank car through the 3rd stop valve and the first oil gas vent, balances, with this, pressure of unloading；
Step 3: activated carbon canister big to one-level regenerates when not unloading or during non-tinning.
The gas recovery system for oil of 11. a kind of asymmetric pair of tank adsorption desorptions according to claim 10, it is characterised in that step
3 specifically include following steps 31:
After groove tanker vehicle unloading or tinning, activated carbon canister big to one-level regenerates, and during regeneration, refrigerating plant runs as usual, closes
Close the first stop valve, the second stop valve and the 3rd stop valve, start vacuum pump activated carbon canister big to one-level and carry out evacuation, take out true
Empty set of time is 1-6 hour, makes regenerating active carbon, and the oil gas of activated carbon adsorption is extracted out by vacuum pump, enters primary oil air cooling
Condenser, part high-concentration oil vapor is condensed, and uncooled gas is partially into two grades of oil-gas condensers, and overwhelming majority oil gas is cold
Solidifying discharge, small part remains uncooled gas part after primary oil gas condenser reclaims cold through pressure maintenance device, then
Discharge through the 4th stop valve, discharge gas and bury the former storage tank of tank evacuated tube or chemical plant by the second oil gas vent and original place, gas station
Evacuated tube connects, or is directly connected into buried tank or tank inside.
The gas recovery system for oil of 12. a kind of asymmetric pair of tank adsorption desorptions according to claim 11, it is characterised in that step
After 31 further comprising the steps of 32:
When the big activated carbon canister of one-level is just in regenerative process, be arranged on the buried tank of the pressure sensing device senses at oil and gas import or
Pressure of storage tank is increased to the pressure that should process, then vacuum pump quits work, and opens the first stop valve and the second stop valve, and one-level is big
After activated carbon canister pressure balance, then open the 3rd stop valve, after making buried tank or the complete pressure release of storage tank, then restart step
31。
The oil-gas recovery method of 13. 1 kinds of asymmetric pair of tank adsorption desorptions, it is characterised in that utilize oil as claimed in claim 5
Gas recovery system carries out petroleum vapor recovery, and concrete steps include:
Step A: the oil gas produced when unloading or during tinning, after the first stop valve, enters primary oil gas condenser so that temperature
Degree is reduced between-10～+10 DEG C, and removes the most of moisture in oil gas；
Step B: the oil gas of preliminary pre-cooling enters back into two grades of oil-gas condensers, refrigerating plant is cold to two grades of oil-gas condenser outputs
Amount, makes oil gas temperature be reduced to-10～-80 DEG C, and the some hydrocarbon material in oil gas is condensed recoverys, remains the gas of low temperature again
Return primary oil gas condenser and carry out heat exchange with the high-temperature oil gas entering primary oil gas condenser through the first stop valve, reclaim low
After temperature energy, enter the big charcoal canister of one-level through the second stop valve, intercept condensation phase could not the oil gas of phase transformation completely, cleaning
Oil gas is through the 5th stop valve, then is directly discharged into air or row through two grades of little activated carbon canisters, the 3rd stop valve and the first oil gas vent
Enter tank car and balance pressure of unloading；
Step C: activated carbon canister big to one-level regenerates when not unloading or when storage tank does not feeds.
The gas recovery system for oil of 14. a kind of asymmetric pair of tank adsorption desorptions according to claim 13, it is characterised in that step
C specifically includes following steps C1:
After groove tanker vehicle unloading or tinning, activated carbon canister big to one-level regenerates, and during regeneration, refrigerating plant runs as usual, closes
Close the first stop valve, the second stop valve and the 5th stop valve, start vacuum pump activated carbon canister big to one-level and carry out evacuation, take out true
Empty set of time is 1-6 hour, makes regenerating active carbon, and the oil gas of activated carbon adsorption is extracted out by vacuum pump, enters primary oil air cooling
Condenser, part high-concentration oil vapor is condensed, and uncooled gas is partially into two grades of oil-gas condensers, and overwhelming majority oil gas is cold
Solidifying discharge, small part remains uncooled gas part after primary oil gas condenser reclaims cold through pressure maintenance device, then
Drain into two grades of little activated carbon canisters of rear end through the 4th stop valve, after through the 3rd stop valve and the first oil gas vent by clean oil
Gas is discharged.
The gas recovery system for oil of 15. a kind of asymmetric pair of tank adsorption desorptions according to claim 14, it is characterised in that step
C1 specifically includes following steps C2:
When the big activated carbon canister of one-level is just in regenerative process, be arranged on the buried tank of the pressure sensing device senses at oil and gas import or
Pressure of storage tank is increased to the pressure that should process, then vacuum pump quits work, and opens the first stop valve, the 4th stop valve and the 5th is cut
Disconnected valve, buried tank or storage tank fill into the big activated carbon canister of one-level of partial vacuum, equilibrium adsorption tank pressure through pressure maintenance device
Power, the most normally opens the second stop valve, the 5th stop valve and the 3rd stop valve, after making buried tank or the complete pressure release of storage tank,
Restart step C1 again.
The gas recovery system for oil of 16. a kind of asymmetric pair of tank adsorption desorptions according to claim 15, it is characterised in that step
The further comprising the steps of C3 of C2:
After the big activated carbon canister of one-level has regenerated substantially, then open the 5th stop valve, close the 3rd stop valve and the 4th and cut off
Two grades of little activated carbon canisters are regenerated by valve, owing to two grades little activated carbon canister volumes are the least, so internal incoagulable gas is very
Few, by slightly elevated for the pressure in the whole space between vacuum pump outlet to the 4th stop valve, this part incoagulability can be offset
The volume of gas so that be not required to arrange special exhaust outlet when two grades of little charcoal canisters are regenerated.
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