CN108339372A - Mink cell focus stores or entrucking process generates the recovery process of oil gas - Google Patents
Mink cell focus stores or entrucking process generates the recovery process of oil gas Download PDFInfo
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- CN108339372A CN108339372A CN201810009147.5A CN201810009147A CN108339372A CN 108339372 A CN108339372 A CN 108339372A CN 201810009147 A CN201810009147 A CN 201810009147A CN 108339372 A CN108339372 A CN 108339372A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1487—Removing organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1418—Recovery of products
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/402—Further details for adsorption processes and devices using two beds
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- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
A kind of recovery process of heavy oil tank or the mink cell focus oil gas of filling process discharge.Oil gas is first absorbed through absorbing oil, and organic matter, impurity and smell therein are removed, and is absorbed tower top oil gas and is carried out adsorption recovery processing into adsorbent bed again.The regeneration that regeneration of adsorbent beds is combined using the vacuum cleaned of condition of high vacuum degree and high intensity, the concentration oil gas that regenerative process obtains return to absorption tower and are recycled.Mink cell focus oil gas is after present invention process is handled, the organic concentration of discharge tail gas can reach the level far below international most stringent of industrial tail gas discharge standard at present, the organic matter rate of recovery is more than 99.9%, and the other impurity and smell in oil gas are also thoroughly recycled and removed simultaneously.
Description
Technical field
The present invention relates to a kind of storages of the industrial circles mink cell focus such as PETROLEUM PROCESSING, coal chemical industry or filling process to generate oil gas
Recovery process.
Background technology
In the late three decades, petroleum vapor recovery is widely spread in industrial circles such as petrochemical industry, chemical industry, and main recycle object is
The oil gas that the filling processes such as volatility light oil oil gas, such as gasoline, naphtha generate, these oil gas have a large capacity and a wide range, and VOCs is dense
Degree is high, and general VOCs concentration is in 200 ~ 1000g/m3 or so, whether from economizing on resources or say all ten in terms of environmental protection
Divide necessity.But another kind of oil gas --- mink cell focus oil gas, for example, decompression residuum, normal pressure weight that refinery's production process generates
Oil, asphalt, wax oil, heavy oil, catalytic slurry etc., coal tar, the coke of coking of coal and the generation of coal chemical industry production process
Oil asphalt etc., entrucking process and the storage of the hydrocarbon class compositions and intermediate products such as ethylene residue that cracking of ethylene production process generates
The oil gas that tank Big and Small Breath process generates, which is but substantially all, is not recycled processing.This is not that people are not concerned with these oil gas
Recovery processing because while the saturated vapor pressure under these mink cell focus room temperature is very low, but since viscosity is often very big, is stored up to meet
Deposit the requirement to mobility with filling process, these mink cell focuses generally require to carry out under 50 ~ 180 DEG C of higher temperature storage and
It fills, at this moment often will produce VOCs concentration and about run damage in the organic matter of 1 ~ 200g/m3 or so, and these mink cell focus oil gas are run
The bigger harm of damage is also not only the loss of organic matter, but wherein contains considerable amount of organic and inorganic sulphide, nitridation
The impurity such as object, BaP, phenolic compound, and often with prodigious penetrating odor, it can be to environmental and human health impacts, especially
It is that the health of operation area operating personnel generates the harm than light oil oil gas bigger.And up to the present, do not have also both at home and abroad
There is the technical solution for finding and being recycled this kind of mink cell focus oil gas reasonable.Difficult point is, the organic matter in mink cell focus oil gas
It is too strong with the adsorption capacity of adsorbent, it easily adsorbs and is difficult to be desorbed, this is just difficult to using usual absorption method petroleum vapor recovery technique back and forth
It receives and handles this kind of oil gas.And the other impurity and smell in mink cell focus oil gas to use absorption method, condensation method, absorption process merely
Etc. techniques become more difficult.
Chinese Patent Application No. 201711090062.6 proposes a kind of recovery process of middle low concentration oil gas, using absorption
Method technique can be by the higher adsorption of boiling point and kerosene, diesel oil etc. compared with heavy oils the oil gas that fills recycle
Processing, makes adsorption process reach adsorption/desorption dynamic equilibrium, while obtaining the tail gas of extremely low organic concentration and higher organic matter
The desorption gas of concentration, and finally recycle organic matter with liquid pattern.But this technique is not suitable for recycling mink cell focus oil gas.
Invention content
The present invention proposes a kind of recovery process of mink cell focus storage and filling process generation oil gas, effectively recycles mink cell focus oil
Organic matter in gas and impurity, while making the almost free from extraneous odour of the tail gas after recovery processing, reach and economize on resources, environmental protection is protected
Protect the purpose of operating personnel's health sum.
The object of the present invention is achieved like this：A kind of recycling work for the mink cell focus oil gas that storage tank or entrucking process generate
Skill includes at least two units of absorptive unit and absorbing unit；Absorptive unit therein includes the absorption of at least one packing section
Tower and recirculation cooler, absorption oil pump etc.；Absorbing unit therein includes the adsorbent bed of 2 mutual handover operations, 1 group of pumping
Vacuum equipment etc.；After mink cell focus oil gas enters device, from absorption tower, filler pars infrasegmentalis enters absorption tower, oily in packing section with absorbing
Counter current contacting, organic matter, impurity and smell in oil gas etc. are absorbed by oil is absorbed, while temperature also drops to room temperature, suction
It receives tower top and absorbs oil in balancing each other, wherein the room temperature tower top oil gas containing a small amount of diesel oil organic constituents enters absorbing unit；
The rich absorbent oil at absorption tower bottom or whole carrying devices or a part of carrying device, another part is after cooler cools
It is recycled back into packing section top as cyclic absorption oil；Tower top oil gas into absorbing unit enters the absorption in adsorption step
Bed, organic constituents therein are adsorbed by adsorbent, and the tail gas discharging directly into atmosphere of organic object are practically free of, when adsorbent beds arrive
When certain adsorption saturation is spent, handover operation, adsorbent bed enters regenerative process；Regeneration of adsorbent beds uses high vacuum and high-intensity vacuum
The regeneration being combined is cleaned, the concentration oil gas that regenerative process obtains also is recycled back into absorption tower filler pars infrasegmentalis；Absorption is single
First every adsorbent bed at least undergoes following operating procedure：
A. adsorption step --- the attached bed entrance of tower top oil gas self-priming enters adsorbent bed, at normal temperatures and pressures, is passed through with adsorbing air speed
During adsorbent bed, the organic constituents easily adsorbed in oil gas are absorbed by the adsorbent loaded in adsorbent bed, are almost removed
Go the inert gases for being not easy to be adsorbed of whole organic constituents as tail gas from adsorbent bed outlet venting straight air, adsorption step knot
Shu Hou, adsorbent bed switch to the regeneration step of step b ~ d；
B. vacuum step --- adsorbent bed is vacuumized from adsorbent bed entrance side with vaccum-pumping equipment, gradually by adsorbent bed
It is evacuated to evacuated pressure, when adsorbent bed pressure is close to evacuated pressure, the organic constituents adsorbed on the sorbent are opened
Begin substantive desorption occur, the higher desorption gas of organic concentration is formed, after the desorption evacuated equipment of gas boosts to micro-positive pressure
It is recycled back into absorption tower filler pars infrasegmentalis as concentration oil gas；
C. vacuum cleaned step --- while continuing to vacuumize adsorbent bed with vaccum-pumping equipment, from adsorbent bed outlet side
Appropriate inert gas is continuously or intermittently introduced, vacuum cleaned pressure is maintained, stagnation pressure and inert gas reduction are reduced vacuumizing
Under the collective effect of partial pressure, the most of organic matter adsorbed on the sorbent is desorbed, and obtains organic concentration and is higher than tower
The desorption gas of organic concentration in oil gas is pushed up, is also used as after the evacuated equipment boosting of the desorption gas that vacuum cleaned process obtains dense
Contracting oil gas is recycled back into absorption tower filler pars infrasegmentalis, and after continuing one vacuum cleaned time, the organic matter adsorbed on adsorbent obtains
To thorough desorption, reach the dynamic equilibrium of organic matter adsorption/desorption；
D. pressurising step --- introducing inert gas on the inside of from adsorbent bed outlet side to adsorbent bed gradually makes adsorbent bed be restored to often
Pressure；
E. circulation step a to step d；Or vacant, then circulation step a to step d.
Further preferably, the absorption tower of absorptive unit includes two or more packing sections, and each packing section is set respectively
There is respective absorption oil circulating system, wherein at least the absorption oil circulating system of lowest part packing section, which is equipped with, absorbs oil cooling but
Device.
Since the rich absorbent oil after absorption mink cell focus oil gas will be usually further processed, inhaled in this way using more packing sections
Receiving tower process can both make absorption tower form the absorption oil systems of multiple and different regenerant concentration gradients, allow top layer's packing section
Oil composition is absorbed closer to fresh absorption oil, to reach best absorption recovering effect；It again can be using a small amount of fresh
In the case of absorbing oil, oily internal circulating load is absorbed by improving each packing section, to meet the hydraulics requirement on absorption tower.Required
It is fresh absorb oil mass depend mainly on the size of mink cell focus oil gas bring into device organic matter and impurity number.Certainly, it is absorbing
In the case that oil can guarantee, such as when refinery be capable of providing in sufficient amount production process intermediate products --- intermediate oil is inhaled
It is more simple using a packing section absorption tower flow when receiving oil.
Absorptive unit use absorption oil should be in mink cell focus oil gas organic matter and impurity have good solubility, together
When initial boiling point or boiling point intermediate oil appropriate or product oil or organic chemical industry's product intermediate products or product liquid.In these
Between the initial boiling point or boiling point of distillate or product oil or organic chemical industry's product intermediate products or product liquid it is both unsuitable excessively high, in order to avoid
Cause that the adsorption capacity between organic matter and adsorbent in tower top oil gas is too strong and is difficult to be desorbed from adsorbent；It is again unsuitable
It is too low, in order to avoid cause that tower top gas concentration is too high and increases the load of absorbing unit.It is preferred absorb oil be initial boiling point 50 ~
Organic chemical industry product intermediate products or product liquid of 250 intermediate oil or product oil or atmospheric boiling point at 40 ~ 200 DEG C.
Further preferably, step b include two step by step, that is, vacuum skimming step and vacuum recycling step；Two substeps
Suddenly technical process is：
B-1. vacuum skimming step --- adsorbent bed is vacuumized from adsorbent bed entrance side with vaccum-pumping equipment, in adsorbent bed
It is gradually evacuated to the preliminary stage of evacuated pressure, that is, adsorbent bed pressure is gradually down to skimming press process by normal pressure
In, not yet there is substantive desorption in the organic matter adsorbed on adsorbent, in this stage, by the low of vaccum-pumping equipment outlet discharge
Concentration desorption gas is recycled back into tower top In Oil-gas Line；
B-2. vacuum recycling step --- continue to vacuumize adsorbent bed from adsorbent bed entrance side with vaccum-pumping equipment, into one
Adsorbent bed is gradually evacuated to evacuated pressure by step by skimming pressure, when adsorbent bed pressure is close to evacuated pressure, absorption
Organic constituents on the sorbent start substantive desorption occur, form the higher desorption gas of organic concentration, desorption gas warp
Vaccum-pumping equipment is used as concentration oil gas to enter absorption tower from filler pars infrasegmentalis after boosting to micro-positive pressure.
Vacuum skimming step is set and advantageously reduces organic object amount that desorption gas cycle is brought into, to reduce adsorbent bed and pumping
The load of vacuum equipment.
Preferably, the skimming pressure of the vacuum skimming step described in step b-1 is 1 ~ 20kPa (A).
Preferably, the adsorbent loaded in absorbing unit adsorbent bed is activated carbon or activated alumina or silica gel, or is divided
Son sieve or resin or combination thereof.
Preferably, the absorption air speed of absorbing unit adsorbent bed is 5 ~ 100h-1。
Preferably, the ratio of height to diameter of absorbing unit adsorbent bed is 1 ~ 8.
Preferably, the evacuated pressure described in step b or step b-2 is 0.001 ~ 5 kPa (A).
Preferably, the vacuum cleaned pressure of step c is 0.01 ~ 5kPa (A).
Preferably, the average flow rate unit for continuously or intermittently introducing inert gas described in step c is Nm3/h, numerical value
It is the 0.01 ~ 5% of vacuum pumping speed.
Preferably, the step c vacuum cleaneds time is not less than 5min.
Preferably, the switching cycle of absorbing unit is not less than 15min.
Preferably, the inert gas described in step c or step d is that air or nitrogen or another seat are in adsorption step suction
The tail gas of attached bed discharge.
Mink cell focus described in the present invention refers to be refinery's decompression residuum, atmospheric residue, asphalt, wax oil, heavy fuel
Coal tar, the tar asphalt etc. that oil, catalytic slurry etc., coking of coal and coal chemical industry production process generate, cracking of ethylene production process
The similar hydrocarbon class composition such as the ethylene residue of generation or intermediate products.The storage of these hydrocarbon class compositions or intermediate products in storage tank
Temperature and entrucking temperature are deposited usually at 50 ~ 180 DEG C.It is indifferent gas that mink cell focus, which stores and during entrucking, will produce main component,
Body（Typically air or nitrogen）, and containing the organic matter of 1 ~ 200g/m3 or so concentration, while usually also having containing considerable amount of
The mixed gas of the impurity such as machine and inorganic sulphide, nitrogenous compound, BaP, phenolic compound --- mink cell focus oil gas, this
The penetrating odor that kind oil gas often has degree different.These oil gas are through storage tank or the closed collection of filling rack, then are pooled to oil gas
After bus, by boosting from pressure or through air-introduced machine, filled again into petroleum vapor recovery after the pretreatment of the facilities such as cooling, liquid separation when necessary
The absorptive unit set.
According to the experimental study that the present inventor carries out, mink cell focus oil gas is after device for recovering oil and gas of the present invention processing, oil
Almost all organic matter and impurity in gas are finally all recycled into absorbing in oil, are practically free of organic object and impurity
Tail gas discharging directly into atmosphere, the organic matter and impurity concentration in tail gas are less than even much lower than《Discharge standard of air pollutants》
GB16297-1996、《Petroleum refining industry pollutant emission standard》GB31570-2015 and《Petro chemical industry pollutant is arranged
Put standard》The extremely low discharge index requirement of mg grades of GB31571-2015, organic matter and the impurity rate of recovery can generally reach 99.9%
More than.Tail gas also meets simultaneously《Emission standard for odor pollutants》The secondary standard of GB14554-93, peculiar smell are all removed substantially
It goes.To achieve the purpose that recycle organic resources, environmental protection and health.
Mink cell focus petroleum vapor recovery technique of the present invention is described further below in conjunction with drawings and examples.It requires emphasis
It is that drawings and examples are intended merely to facilitate a better understanding of the present invention, cannot be understood to be to the claims in the present invention
Limitation.
Description of the drawings
Fig. 1 is the process flow diagram of mink cell focus petroleum vapor recovery technique.
Specific implementation mode
Mink cell focus petroleum vapor recovery technique shown in FIG. 1 has two units of absorptive unit and absorbing unit.Wherein absorptive unit
There is an absorption tower（100）, there is upper packing section on absorption tower（1）With lower packing section（3）Two absorb oily circulation section, and centre passes through collection
Liquid case（2）It separates, the oily circulation section of upper absorption further includes absorbing oil pump（4）, the oily circulation section of lower absorption further includes absorbing oil pump（5）With
Cooler（6）.Absorbing unit is mainly by adsorbent bed（A）And adsorbent bed（B）Two adsorbent beds and vacuum pump（18）It constitutes.
The mink cell focus oil gas that mink cell focus entrucking or storage tank storage process generate is through air-introduced machine（It is not drawn into figure）After boosting, warp
Pipeline（7）From absorption tower（100）Lower part enters absorption tower.After oil gas enters absorption tower, lower packing section is initially passed through from bottom to top
（3）, in the process, and the lower absorption oil counter current contacting for absorbing oily circulation section, the most of organic matter, impurity in oil gas be gentle
Taste etc. is absorbed by oil is absorbed, and oil gas temperature is also reduced to room temperature, by lower absorptions oil circulation section absorption treated oil gas
Through catch box（2）On air rising hole enter upper absorptions oil circulation section.Oil gas is by the upper upper packing section for absorbing oily circulation section（1）
In the process, also experience and the similar process of lower absorption oil circulation section, remaining organic matter, impurity and smell etc. are absorbed in oil gas
Oil further absorbs, and the tower top oil gas on eventually off absorption tower is to absorb oily circulation section absorption oil in the suction to balance each other with upper
Oily oil gas is received, this burst of main component is the tower top oil gas of inert gas and 1v% or so organic concentration through tower top In Oil-gas Line（8）Into
Enter absorbing unit.
Absorption oil from external system is through pipeline（9）From absorption tower（100）Top enters absorption tower, is worn from top to bottom
Cross packing section（1）In the process, counter current contacting is carried out with oil gas, the absorptions such as organic matter, impurity and smell in oil gas is got off,
Oil is absorbed through catch box（2）It collects, then through absorbing oil pump（4）After boosting, through pipeline（10）It is recycled back into absorption tower, extra suction
Oil is received through catch box（2）On air rising hole overflow to the oily circulation section of lower absorption.Fresh absorption oil from external system can connect
It is continuous to introduce absorption tower, it can also be intermittently introduced absorption tower in batches.Introduce absorb oil mass number according to the mink cell focus of processing
Oil and gas content and concentration levels determine, and absorb oily internal circulating load size and require to determine according to absorption tower hydraulics.Due to lower absorption oil
Circulation section absorbs most of organic matter, impurity and smell in mink cell focus oil gas, and the oily circulation section of upper absorption only absorbs remaining
Part, therefore the upper absorption oil for absorbing oily circulation section is upper closer to fresh absorption than the lower absorption oil composition for absorbing oily circulation section
Oil.The oily dosage of fresh absorption is reduced to reach, and meets absorption tower hydraulics requirement, and is obtained close to fresh absorption oil
Assimilation effect.Into the lower operational process for absorbing oily circulation section absorption oil the similar of oily circulation section is absorbed to upper.The difference is that
Due to mink cell focus oil gas inlet temperature of stabilizer higher, also higher, absorption oil exist with oil gas for organic matter, impurity and odorousness in oil gas
Packing section（3）After upper mass transfer diabatic process, into containing the organic matter, miscellaneous in more mink cell focus oil gas in the absorption oil of bottom of tower
Matter and smell, and have larger Wen Sheng.Bottom of tower absorbs oil through pipeline（11）With absorption oil pump（5）Boosting, then through cooler（6）
After being cooled to room temperature, finally through pipeline（13）It is recycled back into absorption tower, extra rich absorbent oil is through pipeline（12）Outer row.
After tower top oil gas enters absorbing unit, into the identical adsorbent bed of 2 functions（A）Or adsorbent bed（B）, any of which
When have 1 be in adsorption step, another 1 be in regeneration step or vacant, 2 mutual handover operations of adsorbent bed.Than such
When adsorbent bed（A）In adsorption step, adsorbent bed（A）Following operating procedure is undergone successively：
Adsorption step --- adsorbent bed（A）Imported valve（A1）And outlet valve（A3）It opens, adsorbent bed（A）Remaining valve
It closes（The valve that the valve opened is closing is not specified below）, oil gas introduces adsorbent bed from adsorbent bed entrance, normal in room temperature
Pressure, during across adsorbent bed, the organic constituents therein easily adsorbed are adsorbed by adsorbent oil gas, are not easy to be adsorbed
Inert gas then pass through it is adsorbent bed, as tail gas from adsorbent bed export along pipeline（14）Through spark arrester（15）It is discharged into big
Gas, the organic concentration in tail gas is by detector（16）Detection record.
When the close outlet in the organic constituents absorption forward position on adsorbent bed, handover operation, adsorbent bed（A）Switch to regeneration
Operation.
Regeneration of adsorbent beds operation shares 4 steps and constitutes, and is vacuum step, vacuum cleaned step and pressurising step successively
Suddenly.
Vacuum step --- adsorbent bed（A）Entrance side valve（A2）It opens, uses vacuum pump（18）To adsorbent bed（A）It takes out true
Sky makes adsorbent bed pressure gradually be down to evacuated pressure, adsorbent bed（A）Operating pressure by pressure transmitter（A5）It measures.
During this, the organic constituents adsorbed on adsorbent gradually start substantive desorption occur, what vaccum-pumping equipment exported
The higher concentration oil gas of organic concentration is through pipeline（17）With pipeline（7）Raw material air-fuel mixture, be finally recycled into absorption tower
Lower part.
If being equipped with skimming step in flow, initial stage vacuum pump is vacuumized（18）The low concentration desorption gas of outlet discharge passes through
The pipeline and valve being appropriately arranged with（It is not drawn into figure）Drain into pipeline（8）With tower top air-fuel mixture, without into absorption tower.
Vacuum cleaned step --- continue to open valve（A2）, and open valve（A4）, inert gas is via valve（A4）
Enter adsorbent bed from adsorbent bed outlet side（A）, vacuumizing the double action for reducing stagnation pressure and inert gas reduction oil gas partial pressure
Under, the organic matter adsorbed on adsorbent is further desorbed, and the concentration oil gas for forming vacuum cleaned process is also recycled back into
Absorption tower lower part.After reaching the vacuum cleaned time of setting, adsorbent bed（A）It is transferred to pressurising step.
Pressurising step --- slowly valve is opened step by step（A3）（The inert gas equalizer valve being specially arranged can also be used
, it is not drawn into figure）, from adsorbent bed（A）Outlet side introduces inert gas, and adsorbent bed pressure is gradually restored to normal pressure.
So far, adsorbent bed（A）An adsorption regeneration cycle terminate, be then recycled into next adsorption regeneration cycle；
Or instructed according to handover operation, after vacant a period of time, it is re-circulated into next adsorption regeneration cycle.
Adsorbent bed（B）Also it is run in a manner of identical with adsorbent bed (A), only in adsorption step, valve（B1）And valve
（B3）It opens；In vacuum step, valve（B2）It opens；In vacuum cleaned step, valve（B2）And valve（B4）It opens；It is filling
Press step, valve（B3）Slowly open step by step；Adsorbent bed（B）Operating pressure by pressure transmitter（B5）It measures.Other behaviour
It is identical as adsorbent bed (A) to make process, details are not described herein again.Such two adsorbent beds alternately switch, logic of the whole process in PLC
Under control, is run according to the logic and sequential step of program setting, realize the continuous of entire adsorption/desorption process.
Embodiment
Certain refinery's asphalt storage oil gas and pitch entrucking oil gas flow 300m3/h, 130 DEG C of entrucking temperature, non-first in oil gas
Alkane total hydrocarbon concentration 23500mg/m3, wherein BaP 0.53mg/m3, sulfide 83mg/m3.Device for recovering oil and gas technological process is such as
Shown in Fig. 1.Oil is absorbed using the normal line intermediate oil of atmospheric and vacuum distillation unit production, 142 DEG C of initial boiling point, 35 DEG C of temperature, absorption
Oily continuous feed, average inlet amount 2m3/h.It absorbs the rich absorbent oil of organic matter and impurity in pitch oil gas and returns to petroleum vapor recovery
Normal line midbarrel oil tank outside device, and eventually enter into refinery's hydro-refining unit and carry out hydrofinishing processing, herein
All organic matters and impurity brought into mink cell focus oil gas are recycled utilization.The absorption oil of absorption tower top and the bottom packing section follows
Ring is respectively 20m3/h.Adsorbent bed air speed 50h-1, switching cycle 180min, evacuated pressure<1kPa (A), vacuum cleaned pressure<
2kPa (A), vacuum cleaned time 120min.
After device for recovering oil and gas is handled, non-methane total hydrocarbons concentration in adsorbent bed outlet discharge tail gas<1mg/m3, non-methane
The total hydrocarbon rate of recovery>99.99%, BaP is not measured, and sulfide is not measured, smell without.
Claims (16)
1. a kind of recovery process for the mink cell focus oil gas that storage tank or entrucking process generate, it is characterised in that：It is single including at least absorbing
Member and two units of absorbing unit；Absorptive unit therein include at least one packing section absorption tower and recirculation cooler,
Absorb oil pump etc.；Absorbing unit therein includes the adsorbent bed of 2 mutual handover operations, 1 group of vaccum-pumping equipment etc.；Mink cell focus oil
After gas enters device, from absorption tower, filler pars infrasegmentalis enters absorption tower, with oily the having in packing section counter current contacting, oil gas of absorption
Machine object, impurity and smell etc. are absorbed by oil is absorbed, while temperature also drops to room temperature, are absorbed tower top and are absorbed oil in equal
Weighing apparatus, wherein the room temperature tower top oil gas containing a small amount of diesel oil organic constituents enters absorbing unit；The rich absorbent oil at absorption tower bottom or
Whole carrying devices or a part of carrying device, another part return after cooler cools as cyclic absorption oil cycle
Go back to packing section top；Tower top oil gas into absorbing unit enters the adsorbent bed in adsorption step, organic constituents therein
It is adsorbed by adsorbent, is practically free of the tail gas discharging directly into atmosphere of organic object, when adsorbent beds are spent to certain adsorption saturation, cut
Operation is changed, adsorbent bed enters regenerative process；Regeneration of adsorbent beds cleans the regeneration side being combined using high vacuum and high-intensity vacuum
Formula, the concentration oil gas that regenerative process obtains also are recycled back into absorption tower filler pars infrasegmentalis；Every adsorbent bed of absorbing unit at least passes through
Go through following operating procedure：
Adsorption step --- the attached bed entrance of tower top oil gas self-priming enters adsorbent bed, at normal temperatures and pressures, is inhaled with adsorbing air speed and passing through
During attached bed, the organic constituents easily adsorbed in oil gas are absorbed by the adsorbent loaded in adsorbent bed, are almost removed
As tail gas from adsorbent bed outlet venting straight air, adsorption step terminates the inert gas for being not easy to be adsorbed of whole organic constituents
Afterwards, adsorbent bed switches to the regeneration step of step b ~ d；
Vacuum step --- adsorbent bed is vacuumized from adsorbent bed entrance side with vaccum-pumping equipment, adsorbent bed is gradually taken out
Vacuum is to evacuated pressure, and when adsorbent bed pressure is close to evacuated pressure, the organic constituents adsorbed on the sorbent start
There is substantive desorption, form the higher desorption gas of organic concentration, the desorption evacuated equipment of gas is made after boosting to micro-positive pressure
It is recycled back into absorption tower filler pars infrasegmentalis for concentration oil gas；
Vacuum cleaned step --- while continuing to vacuumize adsorbent bed with vaccum-pumping equipment, connect from adsorbent bed outlet side
Continue or be intermittently introduced appropriate inert gas, maintain vacuum cleaned pressure, stagnation pressure and inert gas reduction point are reduced vacuumizing
Under the collective effect of pressure, the most of organic matter adsorbed on the sorbent is desorbed, and obtains organic concentration and is higher than tower top
The desorption gas of organic concentration in oil gas, also as concentration after the evacuated equipment boosting of desorption gas that vacuum cleaned process obtains
Oil gas is recycled back into absorption tower filler pars infrasegmentalis, and after continuing one vacuum cleaned time, the organic matter adsorbed on adsorbent obtains
Thoroughly desorption, reaches the dynamic equilibrium of organic matter adsorption/desorption；
Pressurising step --- side is exported to introducing inert gas on the inside of adsorbent bed from adsorbent bed, and adsorbent bed is gradually made to be restored to often
Pressure；
Circulation step a to step d；Or vacant, then circulation step a to step d.
2. technological process according to claim 1, it is characterised in that：The absorption tower of absorptive unit include two or two with
Upper packing section, each packing section are respectively equipped with respective absorption oil circulating system, wherein at least the absorption oil of lowest part packing section
The circulatory system, which is equipped with, absorbs oil cooler.
3. technological process according to claim 1, it is characterised in that：The absorption oil that absorptive unit uses is to mink cell focus oil
Organic matter and impurity in gas have good solubility, while initial boiling point or boiling point intermediate oil appropriate or product oil, or have
Machine chemicals intermediate products or product liquid.
4. technological process according to claim 1 or 3, it is characterised in that：It is centre of the initial boiling point 50 ~ 250 to absorb oil
The organic chemical industry's product intermediate products or product liquid of distillate or product oil or atmospheric boiling point at 40 ~ 200 DEG C.
5. technological process according to claim 1, it is characterised in that：Step b include two step by step, that is, vacuum skimming
Step and vacuum recycling step；Two step by step technical process be：
B-1. vacuum skimming step --- adsorbent bed is vacuumized from adsorbent bed entrance side with vaccum-pumping equipment, in adsorbent bed
It is gradually evacuated to the preliminary stage of evacuated pressure, that is, adsorbent bed pressure is gradually down to skimming press process by normal pressure
In, not yet there is substantive desorption in the organic matter adsorbed on adsorbent, in this stage, by the low of vaccum-pumping equipment outlet discharge
Concentration desorption gas is recycled back into tower top In Oil-gas Line；
B-2. vacuum recycling step --- continue to vacuumize adsorbent bed from adsorbent bed entrance side with vaccum-pumping equipment, into one
Adsorbent bed is gradually evacuated to evacuated pressure by step by skimming pressure, when adsorbent bed pressure is close to evacuated pressure, absorption
Organic constituents on the sorbent start substantive desorption occur, form the higher desorption gas of organic concentration, desorption gas warp
Vaccum-pumping equipment is used as concentration oil gas to enter absorption tower from filler pars infrasegmentalis after boosting to micro-positive pressure.
6. technological process according to claim 5, it is characterised in that：The skimming pressure of the vacuum skimming step of step b-1
For 1 ~ 20kPa (A).
7. technological process according to claim 1 or 5, it is characterised in that：Pressure is vacuumized described in step b or step b-2
Power is 0.001 ~ 5 kPa (A).
8. technological process according to claim 1, it is characterised in that：The adsorbent loaded in absorbing unit adsorbent bed is to live
Property charcoal or activated alumina or silica gel or molecular sieve or resin or combination thereof.
9. technological process according to claim 1, it is characterised in that：The absorption air speed of absorbing unit adsorbent bed is 5 ~ 100h-1。
10. technological process according to claim 1, it is characterised in that：The ratio of height to diameter of absorbing unit adsorbent bed is 1 ~ 8.
11. technological process according to claim 1, it is characterised in that：The vacuum cleaned pressure of step c is 0.01 ~ 5kPa
(A)。
12. technological process according to claim 1, it is characterised in that：Step c continuously or intermittently introduces inert gas
Average flow rate unit is Nm3/h, and numerical value is the 0.01 ~ 5% of vacuum pumping speed.
13. technological process according to claim 1, it is characterised in that：The step c vacuum cleaned times are not less than 5min.
14. technological process according to claim 1, it is characterised in that：The switching cycle of absorbing unit is not less than 15min.
15. technological process according to claim 1, it is characterised in that：The inert gas of step c or step d are air, or
Nitrogen or another seat are in the tail gas of adsorption step adsorbent bed discharge.
16. technological process according to claim 1, it is characterised in that：Mink cell focus oil gas is refinery's decompression residuum, normal pressure weight
Oil, asphalt, wax oil, heavy oil, catalytic slurry etc., coal tar, the coke of coking of coal and the generation of coal chemical industry production process
Oil asphalt etc., the similar hydrocarbon class composition such as ethylene residue that cracking of ethylene production process generates or intermediate products storage or entrucking
The oil gas generated in journey.
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| CN201810009147.5A CN108339372A (en) | 2018-01-04 | 2018-01-04 | Mink cell focus stores or entrucking process generates the recovery process of oil gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810009147.5A CN108339372A (en) | 2018-01-04 | 2018-01-04 | Mink cell focus stores or entrucking process generates the recovery process of oil gas |
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| CN108339372A true CN108339372A (en) | 2018-07-31 |
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| CN113355120A (en) * | 2021-07-07 | 2021-09-07 | 广东韶钢松山股份有限公司 | Tar water control method |
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| CN114797374A (en) * | 2022-05-31 | 2022-07-29 | 山东天景工程设计有限公司 | Device is administered to coal tar loading process peculiar smell |
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