CN106310699B - A kind of gas recovery system for oil and method of asymmetric double tank adsorption desorptions - Google Patents

A kind of gas recovery system for oil and method of asymmetric double tank adsorption desorptions Download PDF

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CN106310699B
CN106310699B CN201610963103.7A CN201610963103A CN106310699B CN 106310699 B CN106310699 B CN 106310699B CN 201610963103 A CN201610963103 A CN 201610963103A CN 106310699 B CN106310699 B CN 106310699B
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oil
gas
level
stop valve
condenser
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CN106310699A (en
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马中华
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Shanghai Poly Chen Amperex Technology Ltd
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Shanghai Poly Chen Amperex Technology Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D5/00Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0057Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/002Separation 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/02Separation 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2253/00Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10Inorganic adsorbents
    • B01D2253/102Carbon
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2259/00Type of treatment
    • B01D2259/40Further details for adsorption processes and devices
    • B01D2259/40001Methods relating to additional, e.g. intermediate, treatment of process gas
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2259/00Type of treatment
    • B01D2259/40Further details for adsorption processes and devices
    • B01D2259/40083Regeneration of adsorbents in processes other than pressure or temperature swing adsorption

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Separation Of Gases By Adsorption (AREA)

Abstract

The invention discloses a kind of gas recovery system for oil and method of asymmetric double tank adsorption desorptions, including the first stop valve, one-level oil-gas condenser, two level oil-gas condenser, the second stop valve, the big charcoal canister of one-level and the 3rd stop valve, first stop valve one end connects oil and gas import, other end connection one-level oil-gas condenser positive input;One-level oil-gas condenser forward direction output end connects two level oil-gas condenser input;Two level oil-gas condenser output end connects one-level oil-gas condenser reverse input end;One-level oil-gas condenser inverse output terminal connects second stop valve one end, the big charcoal canister one end of second stop valve other end connection one-level;3rd stop valve one end connects the big charcoal canister other end of one-level, and the other end connects the first oil gas vent;First stop valve, one-level oil-gas condenser, two level oil-gas condenser, one-level oil-gas condenser, the second stop valve, the big charcoal canister of one-level and the 3rd stop valve are sequentially connected to form a petroleum vapor recovery subsystem.

Description

A kind of gas recovery system for oil and method of asymmetric double tank adsorption desorptions
Technical field
The present invention relates to oil-gas recovery device field, more particularly to a kind of gas recovery system for oil of asymmetric double tank adsorption desorptions And method.
Background technology
The oil-gas recovery device of petroleum vapor recovery three times or oil depot is traditionally used for, typically using condensation-adsorption method, absorption The techniques such as absorption process reclaim, and for condensation-adsorption method, are condensed using the staged of one-level~multistage, make the gradual phase transformation of oil gas Liquefaction separation, the gradual step-down of gas concentration isolated, is discharged subsequently into consequent activities charcoal system adsorption cleaning.
Absorption is to use two groups of (be probably multiple tanks for one group) volume identical adsorption tanks, the absorption of one of which adsorption tanks When, another group of adsorption tanks vavuum pump desorption and regeneration, an adsorption desorption cycle is generally 10~20 minutes, and one group of tank absorption finishes When, another group of tank is also desorbed and finished, and then passes through the adsorption desorption state of valve transfer each group tank, such alternate cycles.
Refer to the attached drawing 1, its principle process are as follows:
After pressure sensitive device 17 senses that entrance starts pressure, high-concentration oil vapor introduces primary oil through air-introduced machine 1 and is gas-cooled Condenser 2 cools, if there is phase-change liquid to be brought out, gas part sequentially enter two level oil-gas condenser 3, three-level oil-gas condenser 4, Level Four oil-gas condenser 5, the liquid portion of phase transformation are brought out.Oil gas is condensed to obtain preliminary purification, the oil gas of remaining low concentration First absorbent charcoal adsorption tank 14 is entered by valve 6, purified gas is discharged by valve 12 again;
When the first absorbent charcoal adsorption tank 14 is being adsorbed, the second absorbent charcoal adsorption tank 15 is being regenerated simultaneously, this When vavuum pump 16 start, valve 9 is opened, and the second absorbent charcoal adsorption tank 15 is vacuumized, the second absorbent charcoal adsorption tank 15 it The oil gas of preceding absorption is desorbed out under vacuo, and the high-concentration oil vapor for being desorbed out is again introduced into two level oil-gas condenser 3 with drawing The air-fuel mixture that blower fan 1 introduces, and condense step by step, uncooled gas part enters back into another group of the first absorbent charcoal adsorption tank 14 Absorption.
At the end of the second absorbent charcoal adsorption tank 15 vacuumizes soon, valve 11 is opened, in the second absorbent charcoal adsorption tank 15 Activated carbon further purge, while balance the pressure of second absorbent charcoal adsorption tank 15, be allowed to meet absorption phase next time It is required that.
Because the gas that vavuum pump 16 is extracted out has certain pressure, the presence of air-introduced machine 1, on the one hand enable high-concentration oil vapor Pressure caused by outlet prevents high-concentration oil vapor from entering when enough introducing equipment, while will not be desorbed because of vavuum pump.To ensure The continuous operation of equipment.
But for the oil gas treating device of gas station, main exhaust of oil when handling groove tank car emptying is (once Petroleum vapor recovery) and buried tank pressure rise caused by exhaust of oil (petroleum vapor recovery three times), need to handle during a petroleum vapor recovery Oil gas flow is very big, reaches 30~60m3/h, and the oil gas flow that petroleum vapor recovery need to be handled three times is very small, only 1~ 5m3/h。
Existing gas station oil gas processing unit is general only exhaust of oil caused by the rise of buried pressure tank have been carried out time Receive, and oil gas during to emptying makes oil gas be directly entered groove tank car, groove tank car is re-filled with oil gas and arrived by the way of VLE Oil depot, which goes to concentrate, carries out petroleum vapor recovery.
The groove tank car of oil gas is filled 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 processing 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 requirement is equipped with, But during according to above flow practical operation, the oil-gas recovery device of oil depot can not be usually recovered to from the oil gas of groove tank car Oil, or the oil than theoretical value much less can only be recovered to.
To find out its cause, there are following several possibility:
1. the groove tank car of gas station, after emptying terminates, whether some gas station operating personnel need hand inspection groove tank car Unsnatch, and open the top cover of groove tank car, cause oil gas in groove tank car to be released into air;
2. the groove tank car of oil is transported to gas station to draw gasoline today, gone to oil depot tomorrow and be changed to draw diesel oil, and oil depot To the diesel oil trestle work of groove tank car charge of oil, basic without dress oil-gas recovery device, (to the petroleum vapor recovery of diesel oil, country does not force also It is required that), so as to cause the petrol gas in groove tank car to run in vain into air;
3. groove tank car is not closed tight, gas is more easy to because the change of temperature causes the drastically change of volume, groove tank than liquid In-car oil gas can make the close of the positions such as the increase of groove tank car internal pressure, many groove tank car caping, detection mouth due to temperature change Closing property is not tight, and groove tank car hauls the race of vehicle oil gas streetful, and when next time arrives oil depot charge of oil, possible internal oil gas subtracts significantly It is few;
4. many groove tank cars do not download the transformation of oil also, and top charge of oil mouth is not of uniform size, and oil depot oil filling riser is not Can be effectively closed to the progress of groove tank car tank mouth, cause the oil-gas recovery device of oil depot to be collected less than high-concentration oil vapor, influence oil depot The yield of oil-gas recovery device.
For these reasons, it is if petroleum vapor recovery can directly be carried out in 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, on the other hand be advantageous to environmental protection, change the oil gas in present groove tank car In oil depot delay disposal far from the present situation for reaching desired effect.
For this reason, it is necessary to first say down secondary oil gas recovery and three times petroleum vapor recovery, secondary oil gas recovery is that gas station exists When refueling a car, the oil gas of oil gas and volatilization of refueling in automotive oil tank, from the gas circuit pipe of petroleum vapor recovery nozzle, by vacuum Pumping returns buried tank (buried tank).
There is escape in the oil gas of fuel tank volatilization, must suck back a little that just to can guarantee that oil gas is tried one's best few when reclaiming oil gas more Escape, thus has partial air and is drawn back into, its vapour-liquid ratio of national regulations is generally 1~1.2:1 (volume ratio).Due to sucking back Oil gas be more than the oily volume that adds to automobile, the pressure of buried tank can be gradually risen, and high breather valve to a certain extent will be beaten Pressure release is opened, makes exhaust of oil into air, and gas volume reduces when temperature step-down, in buried tank, pressure step-down, causes to exhale Inhale valve and open suction air, balance the pressure of buried tank.This is also " the small breathing " being commonly called as.
So, buried tank will pollute when breathing out oil gas to environment, now, must just install 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 reclaimed Journey is referred to as the petroleum vapor recovery three times of gas station.
The petroleum vapor recovery three times of gas station is to solve buried tank due to sucking gas when temperature change or secondary recovery Cause emission problem during pressure rise, general treating capacity is all very small, between 1NM3/h~5NM3/h.
And during gas station's emptying, a general groove tank vehicle volume is 30~60 cubic metres, and whole emptying process is typically one Or so hour completes, i.e., caused oil and gas content is about 30~60Nm3/h, if therefore oil gas returns three times to gas station's emptying fashionable dress picture Equipment as receipts is, it is necessary to which 30 are amplified 30 times or so the requirements that could meet petroleum vapor recovery processing in other words, it is clear that this is not It is economical, therefore, except daily can emptying up to gas stations more than 3 cars, some gas station owners are for economic benefit, upper mistake Outside as the oil-gas recovery processing device the petroleum vapor recovery of petroleum vapor recovery or oil depot three times, there is presently no people, special pair adds Petroleum vapor recovery during petrol station emptying optimizes design.
For the gas station in the whole nation more than 90%, it only has a groove tank car emptying daily, or per couple of days, often About hour of secondary emptying, like this, exemplified by filling a set for the treatment of capacity 50Nm3/h petroleum vapor recovery processing equipment, market Valency is about 30~600,000, even if emptying can reclaim 200 yuan or so of oil every time, the cycle of its cost recovery is also very Long.Because the interval time that gas station oil gas reclaimer uses every time is very long, if gas station oil gas reclaimer is direct Using the technique of traditional double groups of activated carbons alternating adsorption desorption, may in every 24~72 hours only one hour really at full capacity Use, other most times are all idle, and undoubtedly the utilization rate of adsorption desorption system is very low.
Adsorption desorption technique of the invention by 10~20 minutes traditional alternate runs, it is changed to adsorb completely during emptying, emptying After according to buried pressure tank interval desorption oil-gas recovery method, reduce the filling total amount of activated carbon, particularly reduce The rate of air sucked in required of vavuum pump, to greatly reduce one-time investment cost, so as to promote pushing away for gas station's emptying oil-gas recovery device Extensively.
It is illustrated in figure 2 petroleum vapor recovery in gas station of the prior art and (loads onto the petroleum vapor recovery in present patent application Before equipment) connection diagram, the existing main emptying process of a petroleum vapor recovery:During RTC unloading, stop valve V1 is closed, is beaten Open stop valve V3 and stop valve V5, liquid oil flows into buried tank by stop valve V5, and the oil gas in buried tank passes through stop valve V3 returns to oil truck.
The content of the invention
In order to overcome deficiency of the prior art, the present invention provides a kind of gas recovery system for oil of asymmetric double tank adsorption desorptions And method, have the characteristics that simple in construction, floor space is small, cost of investment is low, safety coefficient is high and environmentally friendly.
In order to reach foregoing invention purpose, technical scheme is as follows used by solving its technical problem:
The invention discloses a kind of gas recovery system for oil of asymmetric double tank adsorption desorptions, waved for reclaiming buried tank or storage tank Caused oil gas during hair process and emptying, including the first stop valve, one-level oil-gas condenser, two level oil-gas condenser, The big charcoal canister of two stop valves, one-level and the 3rd stop valve, wherein:
One end connection oil and gas import of first stop valve, the other end connect the positive defeated of the one-level oil-gas condenser Enter end;
The positive output end of the one-level oil-gas condenser connects the input of the two level oil-gas condenser;
The output end of the two level oil-gas condenser connects the reverse input end of the one-level oil-gas condenser;
The inverse output terminal of the one-level oil-gas condenser connects one end of second stop valve, second stop valve The other end connect one end of the big charcoal canister of one-level;
One end of 3rd stop valve connects the other end of the big charcoal canister of one-level, and the other end connects the first oil gas Outlet;
First stop valve, one-level oil-gas condenser, two level oil-gas condenser, one-level oil-gas condenser, the second cut-out The big charcoal canister of valve, one-level and the 3rd stop valve are sequentially connected to form a petroleum vapor recovery subsystem.
Further, the two level oil-gas condenser is using shell-and-tube, board-like or fin-tube type structure.
Further, system also includes a refrigerating plant, and the refrigerating plant is connected with the two level oil-gas condenser, uses Freeze in the two level oil-gas condenser.
One embodiment, system also include vavuum pump, pressure maintenance device and the 4th stop valve, wherein:
The import of the vavuum pump is connected with one end of the big charcoal canister of the one-level, the outlet of vavuum pump and the one-level The positive input connection of oil-gas condenser;
One end of the pressure maintenance device is simultaneously reverse with second stop valve and the one-level oil-gas condenser Output end is connected, and the other end is connected with one end of the 4th stop valve;
The other end of 4th stop valve connects the second oil gas vent;
The big charcoal canister of the one-level, vavuum pump, one-level oil-gas condenser, two level oil-gas condenser, one-level oil gas condensation Device, pressure maintenance device and the 4th stop valve are sequentially connected to form the first regenerating active carbon subsystem.
Another embodiment, system also include vavuum pump, pressure maintenance device, the 4th stop valve, the 5th stop valve and two The small charcoal canister of level, wherein:
The import of the vavuum pump is connected with one end of the big charcoal canister of the one-level, the outlet of vavuum pump and the one-level The positive input connection of oil-gas condenser;
One end of the pressure maintenance device is simultaneously reverse with second stop valve and the one-level oil-gas condenser Output end is connected, and the other end is connected with one end of the 4th stop valve;
One end of 5th stop valve is connected with the other end of the big charcoal canister of the one-level, the other end simultaneously with it is described 4th stop valve is connected with one end of the small charcoal canister of two level;
The other end of the small charcoal canister of two level is connected with one end of the 3rd stop valve;
The big charcoal canister of the one-level, vavuum pump, one-level oil-gas condenser, two level oil-gas condenser, one-level oil gas condensation Device, pressure maintenance device, the 4th stop valve, the small charcoal canister of two level and the 3rd stop valve are sequentially connected to form the second activated carbon again Raw subsystem.
Further, the volume of the small charcoal canister of the two level is between 0.1L~100L.
Preferably, the volume of the small charcoal canister of the two level is between 1L~20L.
Further, the pressure maintenance device is capillary, reducing, breather valve or regulating valve.
Further, system also includes pressure sensitive device, and the pressure sensitive device is arranged at oil and gas import, and with The first stop valve connection, to sense the pressure of buried tank and/or storage tank.
The present invention discloses a kind of oil-gas recovery method of asymmetric double tank adsorption desorptions in addition, utilizes oil gas described above Recovery system carries out petroleum vapor recovery, and specific steps include:
Step 1:Oil gas, into one-level oil-gas condenser, makes after the first stop valve when unloading or caused by tinning 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 precooling enters back into two level oil-gas condenser, and refrigerating plant exports to two level oil-gas condenser Cold, oil gas temperature is set to be reduced to -10~-80 DEG C, some hydrocarbon material in oil gas is condensed recovery, the gas of remaining low temperature Return again to one-level oil-gas condenser and carry out heat exchange, recovery with entering the high-temperature oil gas of one-level oil-gas condenser through the first stop valve After cryogenic energy, enter the big charcoal canister of one-level through the second stop valve, intercept condensation phase could not phase transformation completely oil gas, cleaning Oil gas be discharged into tank car through the 3rd stop valve and the first oil gas vent, pressure of unloading is balanced with this;
Step 3:The big activated carbon canister of one-level is regenerated when not unloading or during non-tinning.
Further, step 3 specifically includes following steps 31:
Groove tank car unload or tinning after the big activated carbon canister of one-level is regenerated, during regeneration, refrigerating plant is transported as usual OK, the first stop valve, the second stop valve and the 3rd stop valve are closed, starts vavuum pump and the big activated carbon canister of one-level take out very Sky, pumpdown time are arranged to 1-6 hours, make regenerating active carbon, and the oil gas of charcoal absorption is discharged into one-level by vacuum pumped Oil-gas condenser, part high-concentration oil vapor are condensed, and uncooled gas part enters two level oil-gas condenser, overwhelming majority oil Gas is condensed discharge, and the remaining uncooled gas part of small part maintains to fill after one-level oil-gas condenser reclaims cold through pressure Put, then discharged through the 4th stop valve, discharge gas passes through the second oil gas vent and gas station's original buried tank evacuated tube or chemical plant Former storage tank evacuated tube connection, or directly it is connected into buried tank or tank inside.
Further, further comprising the steps of 32 after step 31:
When the big activated carbon canister of one-level is just in regenerative process, the pressure sensing device senses being arranged at oil and gas import are buried Tank or pressure of storage tank are increased to the pressure that should be handled, then vavuum pump is stopped, the first stop valve of opening and the second stop valve, and one After the big activated carbon canister pressure balance of level, then the 3rd stop valve is opened, after making buried tank or the complete pressure release of storage tank, then restart step Rapid 31.
The invention also discloses a kind of oil-gas recovery method of asymmetric double tank adsorption desorptions, returned using oil gas described above Receipts system carries out petroleum vapor recovery, and specific steps include:
Step A:Oil gas, into one-level oil-gas condenser, makes after the first stop valve when unloading or caused by tinning 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 precooling enters back into two level oil-gas condenser, and refrigerating plant exports to two level oil-gas condenser Cold, oil gas temperature is set to be reduced to -10~-80 DEG C, some hydrocarbon material in oil gas is condensed recovery, the gas of remaining low temperature Return again to one-level oil-gas condenser and carry out heat exchange, recovery with entering the high-temperature oil gas of one-level oil-gas condenser through the first stop valve After cryogenic energy, enter the big charcoal canister of one-level through the second stop valve, intercept condensation phase could not phase transformation completely oil gas, cleaning Oil gas through the 5th stop valve, then through the small activated carbon canister of two level, the 3rd stop valve and the first oil gas vent be directly discharged into air or It is discharged into tank car and balances pressure of unloading;
Step C:Regenerated when not unloading or to the big activated carbon canister of one-level when storage tank is not fed.
Further, step C specifically includes following steps C1:
Groove tank car unload or tinning after the big activated carbon canister of one-level is regenerated, during regeneration, refrigerating plant is transported as usual OK, the first stop valve, the second stop valve and the 5th stop valve are closed, starts vavuum pump and the big activated carbon canister of one-level take out very Sky, pumpdown time are arranged to 1-6 hours, make regenerating active carbon, and the oil gas of charcoal absorption is discharged into one-level by vacuum pumped Oil-gas condenser, part high-concentration oil vapor are condensed, and uncooled gas part enters two level oil-gas condenser, overwhelming majority oil Gas is condensed discharge, and the remaining uncooled gas part of small part maintains to fill after one-level oil-gas condenser reclaims cold through pressure Put, then the small activated carbon canister of two level of rear end is drained into through the 4th stop valve, most afterwards will be clean through the 3rd stop valve and the first oil gas vent Net oil gas discharge.
Further, step C1 specifically includes following steps C2:
When the big activated carbon canister of one-level is just in regenerative process, the pressure sensing device senses being arranged at oil and gas import are buried Tank or pressure of storage tank are increased to the pressure that should be handled, then vavuum pump is stopped, and open the first stop valve, the 4th stop valve and the 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, normally open the second stop valve, the 5th stop valve and the 3rd stop valve again afterwards, make buried tank or the complete pressure release of storage tank Afterwards, then step C1 is restarted.
Further, the further comprising the steps of C3 of step C2:
After the completion for the treatment of that the big activated carbon canister of one-level regenerates substantially, then the 5th stop valve is opened, close the 3rd stop valve and the 4th Stop valve, the small activated carbon canister of two level is regenerated, because the small activated carbon canister volume of two level is very small, so internal incoagulability gas Body is seldom, pressure of the vacuum pump outlet to the whole space between the 4th stop valve is slightly elevated, you can to offset this part not The volume of solidifying property gas so that be not required to set special exhaust outlet when regenerating the small charcoal canister of two level.
The present invention is allowed to compared with prior art, have the following advantages that and actively imitate due to using above technical scheme Fruit:
1st, the big charcoal canister of one-level can meet the needs that oil gas adsorbs of once unloading in the present invention, be utilized after disposable absorption The interval unloaded twice is slowly regenerated to activated carbon, the recovery time length, its vavuum pump rate of air sucked in required is small, can use 0.1~ 10Nm3/h minipump, has greatly saved one-time investment cost, and general 30~60Nm3/h oil-gas recovery device 20~100Nm3/h vavuum pump, cost height need to often be used;
2nd, all refrigerating plants and electrical components can use 220V civilian power supply in the present invention, and gas station can be direct Use;
3rd, tradition condensation absorption type oil-gas recovery device, while reclaim an oil gas and three times oil gas when, its equipment occupation of land 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 It is interior, save originally compact gas station's land used;
4th, this technique can be used for the storage of other similar mediums in addition to reclaiming available for the emptying of gas station and reclaiming three times The exhaust of oil control of tank.After such as using this process unit is installed on each storage tank, can solve traditional storage tank top gas recovery method It is middle that all storage tanks are connected together, a storage tank blast caused by then unifying recovery discharge gas, other storage tanks can be involved The technical problem of potential safety hazard;
5th, the gas station oil gas reclaimer of conventional belt absorbing process, due to needing adsorption desorption alternate run, its vavuum pump Rate of air sucked in required configuration it is very big, electric power is also big, and uses the vavuum pump of this technique, can be arranged to very small, save throwing Money;
6th, unloaded discontinuous feature using gas station, adsorb when being unloaded using activated carbon, regenerated when not unloading, one is big by one The mode of small two charcoal canisters series connection, has not reclaimed oil gas when unloading singly, and gas station's exhaust emissions concentration is reached completely Mark discharge;Increased charcoal absorption system, newest national standard GB31571-2015 can be met to the non-first of petro chemical industry completely The total appropriate hydrocarbon gas discharge 120mg/m3 of alkane rigors;
7th, using the condensation adsorption system of this technique, it is not necessary to overcome as traditional handicraft using air-introduced machine pressurization true The outlet pressure of empty pump, save investment.Using the gas recovery system for oil of this asymmetric formula adsorption desorption, inhaled equivalent to tradition de- Technique that is attached while exchanging, save the usage amount of valve;
8th, because the second order activity canister of this technique is very small, directly can be filled completely using process pipe is internal in itself Activated carbon substitutes, and traditional handicraft must use the charcoal canister of big particular design, therefore this technique saves manufacturing cost.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment Accompanying drawing be briefly described.It is clear that drawings in the following description are only some embodiments of the present invention, for ability For field technique personnel, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.It is attached In figure:
Fig. 1 is oil-gas recovery device connection diagram in gas station of the prior art;
【Symbol description in Fig. 1】1- air-introduced machines;2- one-level oil-gas condensers;3- two level oil-gas condensers;4- three-level oil gas Condenser;5- level Four oil-gas condensers;6- valves;7- valves;8- valves;9- valves;10- valves;11- valves;12- valves; 13- valves;The absorbent charcoal adsorption tanks of 14- first;The absorbent charcoal adsorption tanks of 15- second;16- vavuum pumps;17- pressure sensitive devices;
Fig. 2 is oil-gas recovery device connection diagram in gas station of the prior art;
Fig. 3 is that the emptying connection diagram after asymmetric formula oil-gas recovery device is loaded onto in the present invention;
Fig. 4 is the overall structure diagram of the asymmetric formula gas recovery system for oil of embodiment one in the present invention;
Fig. 5 is the overall structure diagram of the asymmetric formula gas recovery system for oil of embodiment two in the present invention;
【Primary symbols explanation in Fig. 3-5】
The stop valves of 1- first;2- one-level oil-gas condensers;3- two level oil-gas condensers;The stop valves of 4- second;5- one-levels are big Charcoal canister;The stop valves of 6- the 3rd;7- refrigerating plants;8- vavuum pumps;9- pressure maintenance devices;The stop valves of 10- the 4th;11- is pressed Power induction installation;The stop valves of 12- the 5th;The small charcoal canister of 13- two levels;
Fig. 6 is the schematic flow sheet of the asymmetric formula oil-gas recovery method of embodiment three in the present invention;
Fig. 7 is the schematic flow sheet of example IV asymmetry formula oil-gas recovery method in the present invention.
Embodiment
Below with reference to the accompanying drawing of the present invention, clear, complete description is carried out to the technical scheme in the embodiment of the present invention And discussion, it is clear that as described herein is only a part of example of the present invention, is not whole examples, based on the present invention In embodiment, the every other implementation that those of ordinary skill in the art are obtained on the premise of creative work is not made Example, belongs to protection scope of the present invention.
As shown in figure 3, load onto the main emptying process after asymmetric formula oil-gas recovery device:During RTC unloading, close Stop valve V1 and V6, stop valve V3 and V5 are opened, liquid oil flows into buried tank by 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 processing returns to oil truck by stop valve V3.
The liquid of recovery is periodically put into buried tank by stop valve V4.
Emptying finishes, and closes stop valve V3 and V5, opens stop valve V6, and oil-gas recovery device reverts to processing buried tank " small breathing " is discharged.
Embodiment one
As shown in figure 4, the invention discloses a kind of gas recovery system for oil of asymmetric double tank adsorption desorptions, it is buried for reclaiming Caused oil gas during tank or storage tank volatilization process and emptying, including the first stop valve 1, one-level oil-gas condenser 2, two level oil The big stop valve 6 of charcoal canister 5 and the 3rd of gas condenser 3, the second stop valve 4, one-level, wherein:
One end connection oil and gas import of first stop valve 1, the other end connect the forward direction of the one-level oil-gas condenser 2 Input;The positive output end of the one-level oil-gas condenser 2 connects the input of the two level oil-gas condenser 3;Described two The output end of level oil-gas condenser 3 connects the reverse input end of the one-level oil-gas condenser 2;The one-level oil-gas condenser 2 Inverse output terminal connect one end of second stop valve 4, the other end of second stop valve 4 connects the big work of one-level One end of property canister 5;One end of 3rd stop valve 6 connects the other end of the big charcoal canister 5 of one-level, other end connection First oil gas vent.First stop valve 1, one-level oil-gas condenser 2, two level oil-gas condenser 3, one-level oil-gas condenser 2, The big stop valve 6 of charcoal canister 5 and the 3rd of second stop valve 4, one-level is sequentially connected to form a petroleum vapor recovery subsystem.
Further, the two level oil-gas condenser 3 is using shell-and-tube, board-like or fin-tube type structure.
With continued reference to Fig. 4, system also includes a refrigerating plant 7, the refrigerating plant 7 and the two level oil-gas condenser 3 It is connected, for freezing to the two level oil-gas condenser 3.In the present embodiment, the refrigerating plant 7 can use machinery system Cold, pulse tube refrigeration or thermoacoustic refrigeration.
In addition, system also includes vavuum pump 8, the stop valve 10 of pressure maintenance device 9 and the 4th, wherein:
One end of the import charcoal canister 5 big with the one-level of the vavuum pump 8 is connected, the outlet of vavuum pump 8 with it is described The positive input connection of one-level oil-gas condenser 2;
One end of the pressure maintenance device 9 is simultaneously anti-with second stop valve 4 and the one-level oil-gas condenser 2 Connected to output end, the other end is connected with one end of the 4th stop valve 10;
The other end of 4th stop valve 10 connects the second oil gas vent;
The big charcoal canister 5 of the one-level, vavuum pump 8, one-level oil-gas condenser 2, two level oil-gas condenser 3, one-level oil gas Condenser 2, the stop valve 10 of pressure maintenance device 9 and the 4th are sequentially connected to form the first regenerating active carbon subsystem.
In the present embodiment, the pressure maintenance device 9 is capillary, reducing, breather valve or regulating valve.Other embodiments In, the 4th small stop valve 10 of bore can be used to substitute pressure maintenance device 9, improve the condensation inside two level oil-gas condenser Pressure.
Preferably, system also includes pressure sensitive device 11, and the pressure sensitive device 11 is arranged at oil and gas import, and It is connected with first stop valve 1, to sense the pressure of buried tank and/or storage tank.
Embodiment two
As shown in figure 5, the present embodiment, with being in place of the gas recovery system for oil difference described in embodiment one, system is except bag Include outside vavuum pump 8, pressure maintenance device 9, the 4th stop valve 10, in addition to the 5th stop valve 12 and the small charcoal canister of two level 13, wherein:
One end of the import charcoal canister 5 big with the one-level of the vavuum pump 8 is connected, the outlet of vavuum pump 8 with it is described The positive input connection of one-level oil-gas condenser 2;
One end of the pressure maintenance device 9 is simultaneously anti-with second stop valve 4 and the one-level oil-gas condenser 2 Connected to output end, the other end is connected with one end of the 4th stop valve 10;
The other end of one end charcoal canister 5 big with the one-level of 5th stop valve 12 is connected, the other end simultaneously with One end of 4th stop valve 10 charcoal canister 13 small with two level is connected;
The other end of the small charcoal canister 13 of two level is connected with one end of the 3rd stop valve 6;
The big charcoal canister 5 of the one-level, vavuum pump 8, one-level oil-gas condenser 2, two level oil-gas condenser 3, one-level oil gas The small stop valve 6 of charcoal canister 13 and the 3rd of condenser 2, pressure maintenance device 9, the 4th stop valve 10, two level is sequentially connected to be formed Second regenerating active carbon subsystem.
Further, the volume of the small charcoal canister 13 of the two level is between 0.1L~100L.Preferably, the two level is small The volume of charcoal canister 13 is between 1L~20L.Because the small charcoal canister 13 of two level is very small, in certain embodiments, also may be used Directly to be replaced with oil-gas pipeline filling activated carbon.
Embodiment three
As shown in fig. 6, the present invention discloses a kind of oil-gas recovery method of asymmetric double tank adsorption desorptions in addition, implementation is utilized Gas recovery system for oil described in example one carries out petroleum vapor recovery, and specific steps include:
Step 1:Oil gas, into one-level oil-gas condenser, makes after the first stop valve when unloading or caused by tinning 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 precooling enters back into two level oil-gas condenser, and refrigerating plant exports to two level oil-gas condenser Cold, oil gas temperature is set to be reduced to -10~-80 DEG C, some hydrocarbon material in oil gas is condensed recovery, the gas of remaining low temperature Return again to one-level oil-gas condenser and carry out heat exchange, recovery with entering the high-temperature oil gas of one-level oil-gas condenser through the first stop valve After cryogenic energy, enter the big charcoal canister of one-level through the second stop valve, intercept condensation phase could not phase transformation completely oil gas, cleaning Oil gas be discharged into tank car through the 3rd stop valve and the first oil gas vent, pressure of unloading is balanced with this;
Step 3:The big activated carbon canister of one-level is regenerated when not unloading or during non-tinning.
Further, step 3 specifically includes following steps 31:
Groove tank car is regenerated after unloading to the big activated carbon canister of one-level, and during regeneration, refrigerating plant is run as usual, is closed First stop valve, the second stop valve and the 3rd stop valve, start vavuum pump and the big activated carbon canister of one-level is vacuumized, vacuumize Time is arranged to 1-6 hours, makes regenerating active carbon, and the oil gas of charcoal absorption is discharged into one-level oil gas condensation by vacuum pumped Device, part high-concentration oil vapor are condensed, and uncooled gas part enters two level oil-gas condenser, and most oil gas are condensed Discharge, the remaining uncooled gas part of small part, through pressure maintenance device, then pass through after one-level oil-gas condenser reclaims cold 4th stop valve is discharged, and discharge gas is arranged by the second oil gas vent and gas station's original buried tank evacuated tube or chemical plant original storage tank Blank pipe connects, or is directly connected into buried tank or tank inside.
Further, further comprising the steps of 32 after step 31:
When the big activated carbon canister of one-level is just in regenerative process, the pressure sensing device senses being arranged at oil and gas import are buried Tank or pressure of storage tank are increased to the pressure that should be handled, then vavuum pump is stopped, the first stop valve of opening and the second stop valve, and one After the big activated carbon canister pressure balance of level, then the 3rd stop valve is opened, after making buried tank or the complete pressure release of storage tank, then restart step Rapid 31.
Example IV
As shown in fig. 7, the invention also discloses a kind of oil-gas recovery method of asymmetric double tank adsorption desorptions, embodiment is utilized Gas recovery system for oil described in two carries out petroleum vapor recovery, and specific steps include:
Step A:Oil gas, into one-level oil-gas condenser, makes after the first stop valve when unloading or caused by tinning 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 precooling enters back into two level oil-gas condenser, and refrigerating plant exports to two level oil-gas condenser Cold, oil gas temperature is set to be reduced to -10~-80 DEG C, some hydrocarbon material in oil gas is condensed recovery, the gas of remaining low temperature Return again to one-level oil-gas condenser and carry out heat exchange, recovery with entering the high-temperature oil gas of one-level oil-gas condenser through the first stop valve After cryogenic energy, enter the big charcoal canister of one-level through the second stop valve, intercept condensation phase could not phase transformation completely oil gas, cleaning Oil gas through the 5th stop valve, then through the small activated carbon canister of two level, the 3rd stop valve and the first oil gas vent be directly discharged into air or It is discharged into tank car and balances pressure of unloading;
Step C:Regenerated when not unloading or to the big activated carbon canister of one-level when storage tank is not fed.
Further, step C specifically includes following steps C1:
Groove tank car unload or tinning after the big activated carbon canister of one-level is regenerated, during regeneration, refrigerating plant is transported as usual OK, the first stop valve, the second stop valve and the 5th stop valve are closed, starts vavuum pump and the big activated carbon canister of one-level take out very Sky, pumpdown time are arranged to 1-6 hours, make regenerating active carbon, and the oil gas of charcoal absorption is discharged into one-level by vacuum pumped Oil-gas condenser, part high-concentration oil vapor are condensed, and uncooled gas part enters two level oil-gas condenser, overwhelming majority oil Gas is condensed discharge, and the remaining uncooled gas part of small part maintains to fill after one-level oil-gas condenser reclaims cold through pressure Put, then the small activated carbon canister of two level of rear end is drained into through the 4th stop valve, most afterwards will be clean through the 3rd stop valve and the first oil gas vent Net oil gas discharge.
Further, step C1 specifically includes following steps C2:
When the big activated carbon canister of one-level is just in regenerative process, the pressure sensing device senses being arranged at oil and gas import are buried Tank or pressure of storage tank are increased to the pressure that should be handled, then vavuum pump is stopped, and open the first stop valve, the 4th stop valve and the 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, normally open the second stop valve, the 5th stop valve and the 3rd stop valve again afterwards, make buried tank or the complete pressure release of storage tank Afterwards, then step C1 is restarted.
Further, the further comprising the steps of C3 of step C2:
After the completion for the treatment of that the big activated carbon canister of one-level regenerates substantially, then the 5th stop valve is opened, close the 3rd stop valve and the 4th Stop valve, the small activated carbon canister of two level is regenerated, because the small activated carbon canister volume of two level is very small, so internal incoagulability gas Body is seldom, pressure of the vacuum pump outlet to the whole space between the 4th stop valve is slightly elevated, you can to offset this part not The volume of solidifying property gas so that be not required to set special exhaust outlet when regenerating the small charcoal canister of two level.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto, Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in, It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims It is defined.

Claims (11)

  1. A kind of 1. gas recovery system for oil of asymmetric double tank adsorption desorptions, for reclaiming buried tank or storage tank volatilization process and emptying mistake Caused oil gas in journey, it is characterised in that cut including the first stop valve, one-level oil-gas condenser, two level oil-gas condenser, second Disconnected valve, the big charcoal canister of one-level, the 3rd stop valve, vavuum pump, pressure maintenance device, the 4th stop valve, the 5th stop valve and two The small charcoal canister of level, wherein:
    One end connection oil and gas import of first stop valve, the other end connect the positive input of the one-level oil-gas condenser End;
    The positive output end of the one-level oil-gas condenser connects the input of the two level oil-gas condenser;
    The output end of the two level oil-gas condenser connects the reverse input end of the one-level oil-gas condenser;
    The inverse output terminal of the one-level oil-gas condenser connects one end of second stop valve, second stop valve it is another One end connects one end of the big charcoal canister of one-level;
    One end of 3rd stop valve connects the other end of the big charcoal canister of one-level, and the other end connects the first oil gas and gone out Mouthful;
    First stop valve, one-level oil-gas condenser, two level oil-gas condenser, one-level oil-gas condenser, the second stop valve, one The big charcoal canister of level and the 3rd stop valve are sequentially connected to form a petroleum vapor recovery subsystem;
    The import of the vavuum pump is connected with one end of the big charcoal canister of the one-level, the outlet of vavuum pump and the one-level oil gas The positive input connection of condenser;
    The reverse output with second stop valve and the one-level oil-gas condenser simultaneously of one end of the pressure maintenance device End connection, the other end are connected with one end of the 4th stop valve;
    One end of 5th stop valve is connected with the other end of the big charcoal canister of the one-level, and the other end is simultaneously with the described 4th Stop valve is connected with one end of the small charcoal canister of two level;
    The other end of the small charcoal canister of two level is connected with one end of the 3rd stop valve;
    The big charcoal canister of the one-level, vavuum pump, one-level oil-gas condenser, two level oil-gas condenser, one-level oil-gas condenser, pressure Power maintains device, the 4th stop valve, the small charcoal canister of two level and the 3rd stop valve to be sequentially connected to form regenerating active carbon subsystem.
  2. 2. the gas recovery system for oil of a kind of asymmetric double tank adsorption desorptions according to claim 1, it is characterised in that described two Level oil-gas condenser is using shell-and-tube, board-like or fin-tube type structure.
  3. 3. the gas recovery system for oil of a kind of asymmetric double tank adsorption desorptions according to claim 2, it is characterised in that system is also Including a refrigerating plant, the refrigerating plant is connected with the two level oil-gas condenser, for the two level oil-gas condenser Freezed.
  4. 4. the gas recovery system for oil of a kind of asymmetric double tank adsorption desorptions according to claim 1, it is characterised in that described two The volume of the small charcoal canister of level is between 0.1L~100L.
  5. 5. the gas recovery system for oil of a kind of asymmetric double tank adsorption desorptions according to claim 4, it is characterised in that described two The volume of the small charcoal canister of level is between 1L~20L.
  6. 6. according to a kind of gas recovery system for oil of asymmetric double tank adsorption desorptions described in claim 1, it is characterised in that described Pressure maintenance device is capillary, reducing, breather valve or regulating valve.
  7. 7. the gas recovery system for oil of a kind of asymmetric double tank adsorption desorptions according to claim 1, it is characterised in that system is also Including pressure sensitive device, the pressure sensitive device is arranged at oil and gas import, and is connected with first stop valve, to Sense buried tank and/or the pressure of storage tank.
  8. 8. a kind of oil-gas recovery method of asymmetric double tank adsorption desorptions, it is characterised in that utilize oil gas as claimed in claim 1 Recovery system carries out petroleum vapor recovery, and specific steps include:
    Step A:Oil gas is after the first stop valve when unloading or caused by tinning, into one-level 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 precooling enters back into two level oil-gas condenser, and refrigerating plant exports cold to two level oil-gas condenser Amount, makes oil gas temperature be reduced to -10~-80 DEG C, and some hydrocarbon material in oil gas is condensed recovery, and the gas of remaining low temperature is again Return to one-level oil-gas condenser and carry out heat exchange with entering the high-temperature oil gas of one-level oil-gas condenser through the first stop valve, recovery is low After warm energy, enter the big charcoal canister of one-level through the second stop valve, intercept condensation phase could not phase transformation completely oil gas, it is clean Oil gas is directly discharged into air or row through the 5th stop valve, then through the small activated carbon canister of two level, the 3rd stop valve and the first oil gas vent Enter tank car and balance pressure of unloading;
    Step C:Regenerated when not unloading or to the big activated carbon canister of one-level when storage tank is not fed.
  9. A kind of 9. oil-gas recovery method of asymmetric double tank adsorption desorptions according to claim 8, it is characterised in that step C Specifically include following steps C1:
    Groove tank car unload or tinning after the big activated carbon canister of one-level is regenerated, during regeneration, refrigerating plant is run as usual, is closed The first stop valve, the second stop valve and the 5th stop valve are closed, starts vavuum pump and the big activated carbon canister of one-level is vacuumized, is taken out true 1-6 hours are arranged between space-time, make regenerating active carbon, the oil gas of charcoal absorption is discharged into primary oil air cooling by vacuum pumped Condenser, part high-concentration oil vapor are condensed, and uncooled gas part enters two level oil-gas condenser, and most oil gas are cold Solidifying discharge, the remaining uncooled gas part of small part after one-level oil-gas condenser reclaims cold through pressure maintenance device, then The small activated carbon canister of two level of rear end is drained into through the 4th stop valve, most afterwards through the 3rd stop valve and the first oil gas vent by the oil of cleaning Gas is discharged.
  10. A kind of 10. oil-gas recovery method of asymmetric double tank adsorption desorptions according to claim 9, 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, the pressure sensing device senses buried tank that is arranged at oil and gas import or Pressure of storage tank is increased to the pressure that should be handled, then vavuum pump is stopped, 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, normally open the second stop valve, the 5th stop valve and the 3rd stop valve again afterwards, after making buried tank or the complete pressure release of storage tank, Step C1 is restarted again.
  11. A kind of 11. oil-gas recovery method of asymmetric double tank adsorption desorptions according to claim 10, it is characterised in that step The further comprising the steps of C3 of C2:
    After the completion for the treatment of that the big activated carbon canister of one-level regenerates substantially, then the 5th stop valve is opened, close the 3rd stop valve and the 4th cut-out Valve, the small activated carbon canister of two level is regenerated, because the small activated carbon canister volume of two level is very small, so internal incoagulable gas is very It is few, it is pressure of the vacuum pump outlet to the whole space between the 4th stop valve is slightly elevated, you can to offset this part incoagulability The volume of gas so that be not required to set special exhaust outlet when regenerating the small charcoal canister of two level.
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