CN108689381A - A kind of area of refinery oil loading platform gas recovery system for oil and its recovery method - Google Patents
A kind of area of refinery oil loading platform gas recovery system for oil and its recovery method Download PDFInfo
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- CN108689381A CN108689381A CN201810669923.4A CN201810669923A CN108689381A CN 108689381 A CN108689381 A CN 108689381A CN 201810669923 A CN201810669923 A CN 201810669923A CN 108689381 A CN108689381 A CN 108689381A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/06—Details or accessories
- B67D7/42—Filling nozzles
- B67D7/54—Filling nozzles with means for preventing escape of liquid or vapour or for recovering escaped liquid or vapour
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D2210/00—Indexing scheme relating to aspects and details of apparatus or devices for dispensing beverages on draught or for controlling flow of liquids under gravity from storage containers for dispensing purposes
- B67D2210/00002—Purifying means
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Abstract
The present invention relates to a kind of area of refinery oil loading platform gas recovery system for oil and its recovery methods, absorption plant, dehydration device, condensing unit, adsorbent equipment and fuel delivery device including passing sequentially through pipeline connection, the absorption plant is absorption tower, the dehydration device is made of the forecooler and solid caustic soda tower being sequentially communicated, the condensing unit is by condenser and corresponding refrigeration unit at the adsorbent equipment is adsorption tower.The present invention leverages fully on the oil gas of oil refinery gasoline hydrogenation plant and the collaboration processing volatilization of gas holder retracting device, solve the problem of outlet of desorption and regeneration gas, and adsorb combined dehydration using forecooler condensation and solid caustic soda tower, solve that frosting ice is stifled to cause device for recovering oil and gas cannot continual and steady operation problem, it is utilized with ultralow qualified discharge, realization organic exhaust gas recycling high value to ensure that device can continually and steadily be run.
Description
Technical field
The invention belongs to Investigation of Petroleum Vapor Recovery Technology fields, and in particular to a kind of area of refinery oil loading platform gas recovery system for oil
And its recovery method.
Background technology
The lighter hydrocarbons of light-end products storage, transportation and handling procedure in refinery, effumability light oil constituents and dissolving or carrying
Gas component finally can all be spilt into air if cannot timely and effectively handle, and not only result in a large amount of losses of oil product,
The quality of oil product is reduced, while the oil gas volatilized also can cause environmental pollution, and is security risk.
It is increasingly strict to the discharge standard of Organic Waste Gas Pollution object as people's environmental consciousness and economy consciousness enhance.
State Ministry of Environmental Protection has issued " petro chemical industry pollutant emission standard within 2015(GB31571-2015)" and " petroleum refining work
Industry pollutant emission standard(GB31570-2015)", instead of " discharge standard of air pollutants(GB16297-1996)",
And it further specifies manufacturing enterprise and uses enterprise pollution object emission limit and index.Wherein:Non-methane total hydrocarbons(VOCS)It is small
In 120mg/m3, removal efficiency need to reach 95% or more, and area need to reach 97% or more higher for vulnerable environment, territorial development density;
Benzene and aromatic compound etc. are included into characteristic contamination, discharge further stringent, benzene 4mg/m3, toluene 15mg/m3, dimethylbenzene
For 20mg/m3, styrene 50mg/m3;Some common industrial chemicals or intermediate are included in discharge standard, such as methanol, second two
Alcohol is 50mg/m3, formaldehyde 5mg/m3, ethylene oxide 0.5mg/m3, propylene oxide 1mg/m3, hexamethylene, n-hexane are equal
For 100mg/m3, methyl methacrylate 100mg/m3。
The oil gas of volatilization not only contains light oil constituents(Refer mainly to C5, C6), and contain lighter hydrocarbons gas component(Refer mainly to C2,
C3,C4), while being also mixed with air and steam.Under new discharge standard and pollutant limit value index, existing petroleum vapor recovery technique
No matter technology is adsorbed, condenses, absorbing, the monotechnics such as UF membrane or two kinds of combinations " absorption+condensation ", " absorptions+UF membrane "
Or multiple combinations technology " absorption+UF membrane+absorption ", " absorption+condensation+UF membrane ", it is difficult to meet stringent 120mg/
m3The limit value index of the minimum discharge standard of VOCS, especially characteristic contamination exists and discharges unqualified and difficult problem up to standard,
And it cannot accomplish continual and steady up to standard.
The industrial Investigation of Petroleum Vapor Recovery Technology generally used is absorption+absorption and condensation+absorption, and at least generally existing is as follows
Problem:(1)The regenerated tail gas light hydrocarbon component of vacuum desorption(C2,C3,C4)Or recycle in the device, constantly cycle is constantly long-pending
It is tired, finally deteriorate adsorption process, causes discharge not up to standard or recycled between oil storage tank and device for recovering oil and gas, recycling
Lighter hydrocarbons gas can be emitted into from Tank's Breather Valve in air, pollute source emission transfer.Therefore, existing Investigation of Petroleum Vapor Recovery Technology
Do not solve oil product loss and VOCS governing problems really;(2)Although condensation method and combinations thereof technique can intuitively obtain light oil
Component, but be easy to happen ice and block up phenomenon.From the point of view of actual motion, ice occurs to block up the key of problem to be that aqueous in oil gas does not exist
It adopts an effective measure before deep cooling and is removed, inevitably icing frosting is attached for the steam for causing at the deep cooling stage in oil gas
It in pipeline and condenser, and constantly accumulation causes to block;(3)The constantly cycle accumulation in system of vacuum desorption regeneration gas,
It is difficult to meet VOCS minimum discharge standards(Less than 120mg/m3);(4) in condensation method petroleum vapor recovery, moisture content is low in oil gas,
Water vapor partial pressure is low, and condensation kinetic rate is slow, is difficult to condensation temperature reaches dew-point temperature or less in limited oil gas
It is thoroughly condensed out in residence time, steam is caused to cannot be removed effectively before deep cooling, cause ice stifled in the frosting of deep cooling stage, shadow
Ring device stable operation.
Keep VOCS discharges really up to standard, root problem is the outlet of lighter hydrocarbons gas component to be solved, currently, one is to use pin
The method ruined, second is that using the method recycled.The representative art of destruction method is low-temperature catalytic oxidation, low-temperature catalytic oxidation
Technology is to use high-activity high-selectivity catalyst, and at low temperature, oxygen is reacted with organic matter generates non-toxic and tasteless titanium dioxide
Carbon and water are combined with above-mentioned each technology, can be in the same of recycling light oil constituents to handle the discharge gas of tail end low concentration
When, ensure that discharge index meets the requirement of pollutant standard, but low-temperature catalytic oxidation method is most suitable for the purification of continuous exhaust pneumatic wallop, to gas
Amount, concentration change for the petroleum vapor recovery of frequent and amplitude greatly, and not only preheating needs to consume energy every time, and reaction heat can not also recycle profit
With prodigious energy waste can be caused, and technology development is also immature, and there are many security risks and operations for engineering process
Cost problem, currently without being widely applied.
Invention content
The purpose of the present invention is for the oil gas to volatilize during area of refinery oil loading, provide a kind of area of refinery oil product dress
Platform gas recovery system for oil and its recovery method are unloaded, which relies on refinery's production technology and installations and facilities, combination and cooperation processing
The oil gas of volatilization, solves that petroleum vapor recovery VOCS discharge during area of refinery oil loading is not up to standard and ice is stifled causes petroleum vapor recovery to fill
Set cannot continual and steady operation problem, and realize VOCS minimum discharges(Less than 120mg/m3)With organic exhaust gas recycling high value
It utilizes.
To achieve the above object, the adopted technical solution is that:
A kind of area of refinery oil loading platform gas recovery system for oil, including pass sequentially through the absorption plant of pipeline connection, dehydration dress
It sets, condensing unit, adsorbent equipment and fuel delivery device, the absorption plant are absorption tower, the absorption tower top inlet connection
Agent-entering pump, the absorb the bottom of the tower liquid outlet are connected to out agent pump, and absorption tower lower part air inlet is connected to air-introduced machine outlet end, institute
State the air inlet of connection dehydration device in gas outlet at the top of absorption tower;The dehydration device is by the forecooler and solid caustic soda tower that are sequentially communicated
Composition, the hot-fluid stock input end of the forecooler are connected with top gaseous phase outlet end is absorbed, the solid caustic soda top gaseous phase outlet
End is connected with the inlet port of condenser;The condensing unit is made of condenser and corresponding refrigeration unit, the condenser
Air inlet be connected with the gaseous phase outlet end of solid caustic soda tower top, the cold flow stock import of the outlet port and forecooler of the condenser
End is connected, and the liquid phase outlet of the condenser is all connected to oil storage tank with the liquid phase outlet of forecooler;The adsorbent equipment
For adsorption tower, the absorption top gaseous phase outlet end is connected to air by air bleeding valve, the absorption tower top pipe also with supplement nitrogen
Gas line is connected by aeration valve, and the adsorption tower spirit phase input end is connected to forecooler cold flow stock outlet end by intake valve,
The adsorption tower spirit phase input end is also connected by regeneration valve with the inlet duct of dry vacuum pump, the dry vacuum pump
Outlet conduit be connected by low pressure gas pipe network with refinery's gas holder retracting device.
Preferably, the condensing unit is made of -25 DEG C connected in sequence condensation units and -65 DEG C of condensation units, described -
25 DEG C of condensation units are made of level-one refrigeration machine and first-stage condenser, and -65 DEG C of condensations unit is by two stage cooler and two level
Condenser forms.
Preferably, the adsorbent equipment is adsorption tower, and two adsorption towers are set up in parallel, and the adsorption tower gas outlet respectively leads to
It crosses an air bleeding valve and connects air, the adsorption tower gas outlet is also each connected to by an aeration valve with nitrogen pipeline, two
The air inlet of adsorption tower connects forecooler cold flow stock outlet end each by an intake valve, and the air inlet of two adsorption towers is also each
From the arrival end for connecting dry vacuum pump by a regeneration valve.
Preferably, oil storage tank bottom liquid outlet is connected to oil transportation pump intake, and the oil transfer pump send condensate liquid to gasoline
Hydrogenation device for treatment.
Oil loading platform oil gas is recycled using above-mentioned area of refinery oil loading platform gas recovery system for oil
Method be:
Oil gas is pressurizeed laggard absorption tower by air-introduced machine, is absorbed with a part of heavy gasoline components shunted from gasoline hydrogenation device
Agent carries out counter-current absorption into absorption tower, and the oil after absorption sends the processing of gasoline hydrogenation device back to.Oil gas after absorption is sequentially into precooling
Device and solid caustic soda tower pass through micro-moisture and part oil gas in condensation method and solid caustic soda absorption method joint removing oil gas, dewatered gas
Mutually carry out two level cryogenic separation into condensing unit, level-one condensation, the two corresponding condensation temperatures of condensation be -20~-30 DEG C and -
60~-70 DEG C, light oil constituents is removed by ladder deep cooling(C5 or more components), the gas phase after B-grade condensation backs into forecooler
As cooling medium, exchange heat with oil gas and carry out energy regenerating, oil gas exchanges heat to 1~8 DEG C, from bottom enter activated carbon adsorber into
Row absorption, the gas qualified discharge ejected from adsorption tower.It often adsorbs and switches to another adsorption tower after a certain period of time, adsorption saturation
Adsorption tower vacuumizes, the desorption and regeneration at vacuum degree 95KPa, and supplement gas is nitrogen, by the lighter hydrocarbons gas component of adsorbent micropore(C2
~C4)Desorption comes out, and vacuum desorption gas is recycled by refinery's low pressure gas pipe network into gas holder retracting device, makees the combustion of technique stove
Expect that gas uses.Specifically carry out as follows:
The one oil of step absorbs, and the oil gas of loading/unloading platform recycling is pressurizeed by frequency converting induced draft fan and is sent into absorption tower bottom, and from suction
It receives the absorbent that tower top introduces countercurrently to come into full contact in absorption tower, removes light oil constituents in oil gas, the liquid absorbed is by going out
Agent pump is extracted out from absorption tower bottom, is sent to gasoline hydrogenation device;
Step 2 solid caustic soda be dehydrated, the gas phase being ejected from absorption tower successively pass through forecooler and solid caustic soda tower, carry out condensation dehydration and
Adsorption dewatering goes out the cryogenic gas of condensing unit and the oil gas for going out absorption tower in forecooler heat exchange, oil gas is cooled to 1~8 DEG C,
Reasonable energy utilization.Oil gas can liquefy the condensate moisture of C8 or more components and the overwhelming majority in forecooler, and pass through solid caustic soda
The micro residual moisture of tower adsorbing and removing;
Step 3 cryogenic separation, -25 DEG C of condensation units of process condense units to the gas phase come out from solid caustic soda tower with -65 DEG C successively, according to
According to boiling point difference, most of gas phase is all condensed into liquid, the liquid condensed out leans on flow by gravity into oil storage tank, then by oil transportation
It pumps out outside device;
Step 4 oil gas adsorbs, and the gas for not becoming liquid in condensation process enters adsorption tower and adsorbed, in addition to methane
Organic gas molecule(VOCS)It is attracted in the micropore of activated carbon, and methane and air can not be adsorbed, and suction was directed through
Active carbon bed in attached tower is discharged into air, qualified discharge;
The activated carbon of step 5 vacuum desorption, adsorption saturation is regenerated by vacuum desorption, supplements nitrogen, the gas that vacuum desorption goes out
Body imports low pressure gas pipe network and is recycled into gas holder retracting device.
It is characterized in that, the absorbent used in absorption tower is the heavy naphtha of gasoline hydrogenation device Fractionator Bottom,
Boiling range is 75~208 DEG C, and component is not volatile, compared with oil and gasoline component, more meets similar compatibility principle, absorptive capacity
Greatly, it is the ideal composition for absorbing light oil.
It is characterized in that, the solid caustic soda tower is loaded with solid sodium hydroxide bulk, it is desirable that 100~200 mm of solid caustic soda lumpiness,
Filling rate 65%, by the moisture removal in oil gas to 10ppm hereinafter, aqueous high alkali liquid is periodically discharged from solid caustic soda bottom of tower by row's alkali valve.
It is characterized in that, the forecooler is plate-type condenser, designed size is 2~3 times of processing capacity, increases oil gas
In the residence time of 1~8 DEG C of temperature range, meets condensation demanding kinetics, remove steam to greatest extent, follow-up deep cooling is enable to grow
Ice did not occurred and blocks up phenomenon time, to ensure that device can continually and steadily be run.
It is characterized in that, the supplement gas of adsorption tower vacuum regeneration process uses inert media nitrogen, vacuum desorption gas not to return
Entrance or the absorption tower for returning petroleum vapor recovery, avoid the oil gas explosion limit, and vacuum desorption gas relies on refinery's low pressure gas pipe network gentle
Cabinet retracting device is recycled, and process units technique stove fuel gas is finally used as, and realizes organic exhaust gas high value recycling,
Vicious circle and strange land discharge in avoiding device.
Compared with prior art, the beneficial effects of the invention are as follows:
(1)Adsorption tower is regenerated after adsorption saturation using vacuum desorption, and supplement gas is nitrogen, rather than sky in the prior art
Gas, vacuum desorption gas are not blended into air, can avoid the oil gas explosion limit, are that vacuum desorption gas is created into gas holder retracting device
Necessary condition;
(2)The existing gas holder retracting device in refinery is made full use of, the vacuum desorption gas generated during collaboration processing petroleum vapor recovery will
The vacuum desorption gas that desorption process generates introduces low pressure gas pipe network, by gas holder retracting device, as full factory's process units work
Skill stove fuel gas uses, this just thoroughly solves the outlet for the lighter hydrocarbons gas component that do not coagulated during petroleum vapor recovery, eliminates vacuum
It is recycled inside desorption gas or is transferred to tank field strange land emission problem, and realize organic exhaust gas recycling;
(3)The existing gasoline hydrogenation device in refinery is made full use of, using hydrogenated heavy gasoline as absorbent, with oil and gasoline phase
Than being ideal absorption light oil constituents, more meeting rule of similarity;
(4)Using precooling and solid caustic soda combined dehydration, cold of having more than needed is recycled using forecooler, by the condensation dehydration of forecooler and solid
The adsorption dewatering of washing tower (for removing CO2) can thoroughly remove aqueous in oil gas in the precooling stage, on the one hand, during can effectively avoid deep cooling
Because the condensing capacity caused by low-temperature condenser and its pipeline frosting freeze of bringing into of steam declines to a great extent and adsorb load increase, separately
On the one hand can avoid blockage of condenser cause frequent defrost that refrigerant compression is caused to be shut down, temperature field fluctuation cause it is up to standard cannot
Continually and steadily;
(5)Forecooler uses plate heat exchanger, margin design to extend the residence time, it is ensured that the steam in oil gas is in the precooling stage
Can liquid water be condensed into the maximum extent and be removed, the ice eliminated the icing frosting of follow-up deep cooling process and caused is blocked up and shut down
Defrost problem, guarantee device persistently can continually and steadily be run and qualified discharge.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
In figure, 1. air-introduced machines;2. agent-entering pump;3. absorption tower;4. going out agent pump;5. forecooler;6. solid caustic soda tower;7. row's alkali valve;
8. first-stage condenser;9. level-one refrigeration machine;10. secondary condenser;11. two stage cooler;12. oil storage tank;13. oil transportation
Pump;14. adsorption tower;15. aeration valve;16. air bleeding valve;17. regeneration valve;18. intake valve;19. dry vacuum pump;20. gas holder returns
Receiving apparatus.
Specific implementation mode
The present invention is described in further detail below in conjunction with description of the drawings.
As shown in Figure 1, a kind of area of refinery oil loading platform gas recovery system for oil, including pass sequentially through the suction of pipeline connection
Receiving apparatus, dehydration device, condensing unit, adsorbent equipment and fuel delivery device, the absorption plant are absorption tower 3, the absorption tower 3
Top inlet is connected to agent-entering pump 2, and 3 bottom liquid outlet of the absorption tower is connected to out agent pump 4,3 lower part air inlet of the absorption tower
It is connected to 1 outlet end of air-introduced machine, 3 top gas outlet of the absorption tower is connected to the air inlet of dehydration device;The dehydration device by according to
The forecooler 5 and solid caustic soda tower 6 of secondary connection form, and the import of hot-fluid stock and the absorption tower 3 of the forecooler 5 push up gaseous phase outlet and be connected
Logical, the solid caustic soda tower 6 pushes up gaseous phase outlet and is connected with the air inlet of condenser;The condensing unit is by condenser and corresponding refrigeration
Unit forms, and the air inlet of the condenser is connected with the gaseous phase outlet that solid caustic soda tower 6 push up, the gas outlet of the condenser and in advance
The cold flow stock import of cooler 5 is connected, and the liquid phase outlet of the condenser is all connected to oil storage with the liquid phase outlet of forecooler 5
Tank 12;The adsorbent equipment is adsorption tower 14, and the adsorption tower 14 pushes up gaseous phase outlet and is connected to air, the suction by air bleeding valve 16
14 push pipe road of attached tower is also connected with supplement nitrogen line by aeration valve 15, and 14 spirit phase import of the adsorption tower passes through intake valve
18 connection 5 cold flow stock of forecooler outlets, 14 spirit phase import of the adsorption tower also pass through regeneration valve 17 and dry vacuum pump 19
Inlet duct is connected, and outlet conduit and the refinery's gas holder retracting device 20 of the dry vacuum pump 19 pass through low pressure gas pipe network
It is connected.
In embodiments of the present invention, the condensing unit is by -25 DEG C connected in sequence condensation units and -65 DEG C of condensation units
Composition, -25 DEG C of condensations unit are made of level-one refrigeration machine 9 and first-stage condenser 8, and -65 DEG C of condensations unit is by two level
Refrigeration machine 11 and secondary condenser 10 form.
In embodiments of the present invention, the adsorbent equipment is adsorption tower 14, and two adsorption towers 14 are set up in parallel, the absorption
Air is connected in 14 gas outlet of tower each by an air bleeding valve 16, and 14 gas outlet of the adsorption tower also each passes through an aeration valve
15 are connected to nitrogen pipeline, and the air inlet of two adsorption towers 14 is connected 5 cold flow stock of forecooler each by an intake valve 18 and gone out
Mouthful, the air inlet of two adsorption towers 14 also each connects the arrival end of dry vacuum pump 19 by a regeneration valve 17.
In embodiments of the present invention, 12 bottom liquid outlet of the oil storage tank is connected to 13 entrance of oil transfer pump, the oil transfer pump 13
Condensate liquid is sent to the processing of gasoline hydrogenation device.
Oil loading platform oil gas is recycled using above-mentioned area of refinery oil loading platform gas recovery system for oil
Method be:
Oil gas introduces oil gas inlet buffer from plant area's oil loading platform by oil gas collection pipeline, removes pipeline impurity and liquid
State water, then 20~30KPa is forced by frequency converting induced draft fan 1(Gauge pressure)It is sent into absorption tower 3 afterwards, with from gasoline hydrogenation device gasoline
A part of heavy gasoline components that prefractionator bottom is drawn(75-208 DEG C of true boiling point distillation boiling range)Make absorbent, into absorption tower 3 into
Row counter-current absorption, the oil after absorption send the processing of gasoline hydrogenation device back to.Oil gas after absorption sequentially into forecooler 5 and solid caustic soda tower 6,
By micro-moisture and part oil gas in condensation method and solid caustic soda absorption method joint removing oil gas, dewatered gas phase is into condensing unit
Two level cryogenic separation is carried out, level-one condensation, the corresponding condensation temperature of two condensations are -20~-30 DEG C and -60~-70 DEG C, are led to
It crosses ladder deep cooling and removes light oil constituents(C5 or more light oil constituents), the gas phase after B-grade condensation(- 60~-70 DEG C)It backs into pre-
Cooler 5 exchanges heat with oil gas as cooling medium and realizes energy regenerating, oil gas temperature is exchanged heat to 1~8 DEG C, enters work from bottom
Property charcoal adsorption tower 14 adsorbed, the gas qualified discharge ejected from adsorption tower 14.Often adsorb certain time(20~30 minutes)
After switch to another adsorption tower 14, the adsorption tower 14 of adsorption saturation is evacuated to desorption and regeneration under vacuum degree 95KPa, desorption and regeneration
The supplement gas of process is nitrogen, by the lighter hydrocarbons gas component of adsorbent micropore(C2~C4)Desorption comes out, and vacuum desorption gas passes through refining
Factory's low pressure gas pipe network is recycled into gas holder retracting device 20, finally makees the use of technique stove fuel gas.Specifically according to following mistake
Cheng Jinhang:
The first step is agent oil absorption process, and the oil gas of loading/unloading platform recycling is pressurizeed by frequency converting induced draft fan 1 and is sent into absorption tower 3
Bottom countercurrently comes into full contact in absorption tower 3 with the absorbent introduced from the top of absorption tower 3, removes light oil constituents in oil gas(Refer to light vapour
Oil ingredient), the liquid that absorbed extracted out from 3 bottom of absorption tower by going out agent pump 4, sent to the processing of gasoline hydrogenation device;
Second step is solid caustic soda dehydration, and the gas phase being ejected from absorption tower 3 passes through forecooler 5 and solid caustic soda tower 6 successively, is carried out cold
Solidifying dehydration and adsorption dewatering, go out the cryogenic gas of condensing unit as cooling medium, and go out the oil gas on absorption tower 3 in forecooler 5
Oil gas is cooled to 1~8 DEG C by middle heat exchange, and reasonable energy utilization improves refrigerating efficiency.Oil gas can will be in air in forecooler 5
C8 or more light oil constituents liquefies in the moisture and oil gas that contain, and by the micro residual moisture of solid caustic soda 6 adsorbing and removings of tower;
Third step is cryogenic separation process, and -25 DEG C of process condenses units and -65 DEG C of freezing machines to the gas phase that dehydration generates successively
Most gas phases are all condensed into liquid by group according to boiling point difference, and the liquid condensed out leans on flow by gravity into oil storage tank
12, then by 13 carrying device of oil transfer pump outside;
4th step is oil gas adsorption process, and the gas for not becoming liquid in condensation process enters adsorption tower 14 and adsorbed, and removes first
Organic gas molecule other than alkane(VOCS)It is attracted in the micropore of activated carbon, and methane and air can not be adsorbed, directly
The active carbon bed being perforated through in adsorption tower 14 is discharged into air, qualified discharge;
5th step is vacuum desorption process, and the activated carbon of adsorption saturation is regenerated by vacuum desorption, supplements nitrogen, and vacuum desorption goes out
Gas import low pressure gas pipe network and recycled into gas holder retracting device 20, adsorption tower 14 controls vacuum degree when desorption and regeneration
95KPa。
In embodiments of the present invention, the absorbent used in the absorption tower 3 is gasoline hydrogenation device Fractionator Bottom
Heavy naphtha, boiling range are 75~208 DEG C, and component is not volatile, and most close with recycling light oil constituents, more meet similar compatibility
Principle, good absorption effect, absorptive capacity are big.
In embodiments of the present invention, the solid caustic soda tower 6 is loaded with solid sodium hydroxide bulk, it is desirable that and solid caustic soda lumpiness 100~
200 mm, filling rate 65%, by the moisture removal in oil gas to 10ppm hereinafter, aqueous high alkali liquid is periodically from 6 bottom of solid caustic soda tower by arranging
Alkali valve 7 is discharged.
In embodiments of the present invention, the forecooler 5 is panel cooler, and designed size is 2~3 times of processing capacity,
To increase oil gas in the residence time of 1~8 DEG C of temperature range, meets moisture condensation demanding kinetics, go to remove water to the maximum extent
Vapour enables follow-up deep cooling that ice does not occur for a long time and blocks up phenomenon, to ensure that device can continually and steadily be run.
In embodiments of the present invention, the supplement gas of vacuum desorption regenerative process uses inert media nitrogen, vacuum desorption gas
Entrance or the absorption tower 3 of petroleum vapor recovery are not returned to, and vacuum desorption gas relies on refinery's low pressure gas pipe network and gas holder retracting device 20
It is recycled, is used as process units technique stove fuel gas, realize the high value utilization of resources of organic exhaust gas, it is pernicious in avoiding device
Cycle or the discharge of organic exhaust gas strange land.
Compared with prior art, advantage of the invention is that:
(1)The present invention makes full use of the existing gas holder retracting device in refinery, the vacuum generated during collaboration processing petroleum vapor recovery de-
Attached gas(Circulating air), the outlet of circulating air is thoroughly solved, realizes organic exhaust gas recycling;
(2)The present invention makes full use of the existing gasoline hydrogenation device in refinery, using hydrogenated heavy gasoline as absorbent, same to oil and gasoline
It compares, more meets rule of similarity, good absorption effect is the ideal composition for absorbing light oil constituents;
(3)The present invention using precooling and solid caustic soda combined dehydration, using forecooler recycle have more than needed cold, can by oil gas it is aqueous
The precooling stage thoroughly removes, on the one hand, can effectively avoid bringing into low-temperature condenser and its pipeline because of steam during deep cooling
Frosting icing causes condensing capacity to decline to a great extent and adsorb load increase, on the other hand, can avoid frequency caused by condenser ice blocks up
Numerous defrost, refrigerant compression are shut down, temperature field fluctuation, problem that cannot be continual and steady up to standard.
The above content is the further descriptions for combining specific implementation mode to be the present invention, must not believe that the present invention
Specific implementation be confined to these explanations, for those of ordinary skill in the art to which the present invention belongs, do not departing from
Under the premise of present inventive concept, the simple replacement made all shall be regarded as belonging to protection scope of the present invention.
Claims (9)
1. a kind of area of refinery oil loading platform gas recovery system for oil, it is characterised in that:Suction including passing sequentially through pipeline connection
Receiving apparatus, dehydration device, condensing unit, adsorbent equipment and fuel delivery device, the absorption plant are absorption tower(3), the absorption
Tower(3)Top inlet is connected to agent-entering pump(2), the absorption tower(3)Bottom liquid outlet is connected to out agent pump(4), the absorption tower
(3)Lower part air inlet is connected to air-introduced machine(1)Outlet end, the absorption tower(3)Top gas outlet is connected to the air inlet of dehydration device;
The dehydration device is by the forecooler that is sequentially communicated(5)With solid caustic soda tower(6)Composition, the forecooler(5)The import of hot-fluid stock with
Absorption tower(3)Top gaseous phase outlet is connected, the solid caustic soda tower(6)Top gaseous phase outlet is connected with the air inlet of condenser;It is described
Condensing unit is made of condenser and corresponding refrigeration unit, air inlet and the solid caustic soda tower of the condenser(6)The gaseous phase outlet on top
It is connected, the gas outlet of the condenser and forecooler(5)Cold flow stock import be connected, the liquid phase outlet of the condenser
And forecooler(5)Liquid phase outlet be all connected to oil storage tank(12);The adsorbent equipment is adsorption tower(14), the adsorption tower
(14)Top gaseous phase outlet passes through air bleeding valve(16)It is connected to air, the adsorption tower(14)Push pipe road also passes through benefit with supplement nitrogen line
Air valve(15)It is connected, the adsorption tower(14)Spirit phase import passes through intake valve(18)It is connected to forecooler(5)Cold flow stock exports,
The adsorption tower(14)Spirit phase import also passes through regeneration valve(17)With dry vacuum pump(19)Inlet duct be connected, it is described
Dry vacuum pump(19)Outlet conduit and refinery's gas holder retracting device(20)It is connected by low pressure gas pipe network.
2. a kind of area of refinery oil loading platform gas recovery system for oil according to claim 1, it is characterised in that:It is described cold
Solidifying device is made of -25 DEG C connected in sequence condensation units and -65 DEG C of condensation units, and -25 DEG C of condensations unit is by level-one system
Cold(9)And first-stage condenser(8)Composition, -65 DEG C of condensations unit is by two stage cooler(11)And secondary condenser(10)
Composition.
3. a kind of area of refinery oil loading platform gas recovery system for oil according to claim 1, it is characterised in that:The suction
Attaching is set to adsorption tower(14), two adsorption towers(14)It is set up in parallel, the adsorption tower(14)It is arranged each by one gas outlet
Air valve(16)Connect air, the adsorption tower(14)Gas outlet also each passes through an aeration valve(15)It is connected to nitrogen pipeline,
Two adsorption towers(14)Air inlet each by an intake valve(18)Connect forecooler(5)Cold flow stock outlet end, two suctions
Attached tower(15)Air inlet also each pass through a regeneration valve(17)Connect dry vacuum pump(19)Arrival end.
4. a kind of area of refinery oil loading platform gas recovery system for oil according to claim 1, it is characterised in that:The storage
Oil tank(12)Bottom liquid outlet and oil transfer pump(13)Entrance is connected to, the oil transfer pump(13)Condensate liquid is sent to gasoline hydrogenation device
Reason.
5. using the recovery and treatment method of any one area of the refinery oil loading platform oil gas of Claims 1-4 4, feature exists
In:
Oil gas passes through air-introduced machine(1)It pressurizes laggard absorption tower(3), with a part of heavy gasoline components shunted from gasoline hydrogenation device
Make absorbent, into absorption tower(3)Counter-current absorption is carried out, the oil after absorption sends the processing of gasoline hydrogenation device back to;Oil gas after absorption
Sequentially into forecooler(5)With solid caustic soda tower(6), pass through micro-moisture and part in condensation method and solid caustic soda absorption method joint removing oil gas
Oil gas, dewatered gas phase carry out two level cryogenic separation, level-one condensation, the corresponding condensation temperature of two condensations into condensing unit
For -20~-30 DEG C and -60~-70 DEG C, light oil constituents is removed by ladder deep cooling(C5 or more components), the gas after B-grade condensation
Mutually back into forecooler(5), energy regenerating is carried out as cooling medium and oil gas heat exchange, oil gas exchanges heat to 1~8 DEG C, the bottom of from
Portion enters activated carbon adsorber(14)It is adsorbed, from adsorption tower(14)The gas qualified discharge of ejection;Often adsorb certain time
After switch to another adsorption tower(14), the adsorption tower of adsorption saturation(14)It vacuumizes, the desorption and regeneration at vacuum degree 95KPa, mends
Inflation is nitrogen, by the lighter hydrocarbons gas component of adsorbent micropore(C2~C4)Desorption comes out, and vacuum desorption gas passes through refinery's low pressure watt
This pipe network is into gas holder retracting device(20)It is recycled, makees the use of technique stove fuel gas;Specifically carry out as follows:
The one oil of step absorbs, and the oil gas that loading/unloading platform recycles is passed through frequency converting induced draft fan(1)Pressurization is sent into absorption tower(3)Bottom,
With from absorption tower(3)The absorbent introduced is pushed up on absorption tower(3)Interior adverse current comes into full contact with, and removes light oil constituents in oil gas, absorbs
The liquid crossed is by going out agent pump(4)From absorption tower(3)Bottom is extracted out, is sent to gasoline hydrogenation device;
Step 2 solid caustic soda is dehydrated, from absorption tower(3)The gas phase being ejected passes through forecooler successively(5)With solid caustic soda tower(6), carry out
Condensation dehydration and adsorption dewatering go out the cryogenic gas of condensing unit and go out the oil gas on absorption tower in forecooler(5)Heat exchange, by oil gas
It is cooled to 1~8 DEG C, reasonable energy utilization;Oil gas is in forecooler(5)In can by C8 or more components and the overwhelming majority condensate moisture
Liquefaction, and pass through solid caustic soda tower(6)The micro residual moisture of adsorbing and removing;
Step 3 cryogenic separation, from solid caustic soda tower(6)- 25 DEG C of process condenses units and -65 DEG C of freezing machines to gas phase out successively
Most of gas phase is all condensed into liquid by group according to boiling point difference, and the liquid condensed out leans on flow by gravity into oil storage tank
(12), then by oil transfer pump(13)Outside carrying device;
Step 4 oil gas adsorbs, and the gas for not becoming liquid in condensation process enters adsorption tower(14)Adsorbed, except methane with
Outer organic gas molecule(VOCS)It is attracted in the micropore of activated carbon, and methane and air can not be adsorbed, and are directed through
Cross adsorption tower(14)Interior active carbon bed is discharged into air, qualified discharge;
The activated carbon of step 5 vacuum desorption, adsorption saturation is regenerated by vacuum desorption, supplements nitrogen, the gas that vacuum desorption goes out
Body imports low pressure gas pipe network into gas holder retracting device(20)It is recycled.
6. the recovery and treatment method of oil loading platform oil gas in area of refinery according to claim 5, it is characterised in that:Institute
State absorption tower(3)Used absorbent is the heavy naphtha of gasoline hydrogenation device Fractionator Bottom, and boiling range is 75-208 DEG C, group
It is point not volatile, compared with oil and gasoline component, more meet similar compatibility principle, absorptive capacity is big, is the reason for absorbing light oil
Think component.
7. the recovery and treatment method of oil loading platform oil gas in area of refinery according to claim 5, it is characterised in that:It is described
Solid caustic soda tower(6)It is loaded with solid sodium hydroxide bulk, it is desirable that 100~200 mm of solid caustic soda lumpiness, filling rate 65% will be in oil gas
Moisture removal is to 10ppm or less, and aqueous high alkali liquid is periodically from solid caustic soda tower(6)Bottom is discharged by row's alkali valve.
8. according to claim 5 area of the refinery oil loading platform oil gas stated recovery and treatment method, it is characterised in that:It is described
Forecooler(5)For plate-type condenser, designed size is 2~3 times of processing capacity, increases oil gas and stops in 1~8 DEG C of temperature range
The time is stayed, meets condensation demanding kinetics, removes steam to greatest extent, enables follow-up deep cooling that ice does not occur for a long time and blocks up phenomenon,
To ensure that device can continually and steadily be run.
9. the recovery and treatment method of oil loading platform oil gas in area of refinery according to claim 5, it is characterised in that:It is described
Adsorption tower(14)The supplement gas of vacuum desorption regenerative process uses inert media nitrogen, vacuum desorption gas not to return to petroleum vapor recovery
Entrance or absorption tower(3), the oil gas explosion limit is avoided, vacuum desorption gas relies on refinery's low pressure gas pipe network and gas holder retracting device
(20)It is recycled, is finally used as process units technique stove fuel gas, realized organic exhaust gas high value recycling, avoid filling
Set interior vicious circle and strange land discharge.
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