CN100369653C - Oil gas absorptive reclaiming method and apparatus - Google Patents

Oil gas absorptive reclaiming method and apparatus Download PDF

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Publication number
CN100369653C
CN100369653C CNB2005101230162A CN200510123016A CN100369653C CN 100369653 C CN100369653 C CN 100369653C CN B2005101230162 A CNB2005101230162 A CN B2005101230162A CN 200510123016 A CN200510123016 A CN 200510123016A CN 100369653 C CN100369653 C CN 100369653C
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oil
absorption
pump
recovery
oil gas
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CNB2005101230162A
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Chinese (zh)
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CN1806894A (en
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黄维秋
赵书华
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中国石油化工股份有限公司
江苏工业学院
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Abstract

The present invention relates to a method and a device for absorbing and recoveringan an oil gas, which belongs to the technical fields of environment protection and energy saving. The whole process for recovering the oil gas can be divided into three parts of the absorption and separation of an absorption tower, the desorption and concentration of a desorption tank and the absorption and recovery of a recovery tower, and the device comprises a sealed loading crane pipe, storage and transportation equipment for oil products, the absorption tower, a solvent pump, a desorption lying tank, a vacuum pump, the recovery tower, a gasoline enrichment pump and a gasoline leanness pump. The present invention is characterized in that the desorption lying tank is arranged, and the inner part of the desorption lying tank is provided with 2 to 4 layers of partition boards; the partition boards all have certain obliquity, the direction is different, and the obliquity is from 0.01 to 0.02; the partition boards can be welded with a plurality of low weir boards, the high end of each partition board is provided with a baffle plate, and the middle part of each partition board can be selectively provided with a ventilation pipe; the outlet of the desorption lying tank is filled with a filling material for defogging, and the bottom of the desorption lying tank is provided with an absorbent leanness outlet; the oil gas is absorbed and recovered at normal temperature and under normal pressure by intermittent operation, and the cost of equipment investment and operation can be saved. The present invention has the advantages of high recovery rate and large operation elasticity, and a treatment medium can be the oil gas exhausted during the conventional storage and transportation process of the oil products.

Description

Oil gas absorbs method and the device that reclaims
Technical field
The present invention relates to environmental protection and field of energy-saving technology, refer in particular to oil gas and absorb method and the device that reclaims.
Background technology
At present, the separation and recovery method of oil gas and air has absorption process, absorption method, condensation method and membrane separation process etc., and some also contains the comprehensive utilization of compression process or several method.The principle that various oil gas reclaim has nothing in common with each other, and it is bigger that technical and economic performance also differs.
The absorption method oil-gas recovery method is to utilize oil gas---the difference of adhesion power between each component and the adsorbent in the air Mixture makes the constituent of air of difficult absorption separate with the oil-gas component of easy absorption.Active carbon at present commonly used and modifier (as NACF) thereof adsorb oil gas.Charcoal adsorption process can be considered adiabatic absorption.In the oil storage and transportation process, the oil gas flow that discharge vaporization comes out is big, concentration is high, goes back height in the domestic oil gas and contains unsaturated hydrocarbons such as alkene.The absorption method recovery method is used for handling this oil gas, and heat of adsorption is very obvious.The heat of adsorption effect will be brought a series of consequences, as: oxidation (self-catalysis), charing, coking, polymerization easily take place in impurity such as unsaturated hydrocarbons and sulphur in (1) oil gas, fill out the active carbon effective apearture, reduce active carbon activated adoption surface area, thereby reduce its effective adsorption capacity and influence service life; (2) jeopardize adsorption operations safety.In addition, also there are many problems in its industrial equipment, and is many as easily worn part, because adsorption tower will carry out frequent absorption---and the desorb switching that circulates automatically, corresponding valve want to realize this operation automatically that the service life of sequencing valve is shorter.An advantage of adsorbing separation is that exhaust emissions concentration is controlled in the lower index.Therefore, from the developing direction of Oil-gas Separation recovery technology and exhaust emissions index aspect such as strictness day by day, for the feeding gas of high throughput, high concentration, oil gas adsorbing separation recovery method will mainly be used as (assisting) service that makes a final check of other separation method (as absorption process, membrane separation process, condensation method) from now on.
The condensation method oil-gas recovery method promptly utilizes cold-producing medium or condensing agent to carry out the indirect heat transfer condensation by heat exchanger, thereby directly is recovered to oil product.This method principle is simple, but owing to be indirect heat transfer, device operating temperature and cryogenic temperature low (as to-80 ℃) can guarantee that just the rate of recovery reaches about 90%, and correspondingly refrigeration system is complicated.Simultaneously, also will and increase links such as insulation, defrosting with low temperature material, and not reclaim the oil gas fashionable dress and put also and moving (keeping operation) continuously, cost of investment and operating cost are all high.This type of device also may be aided with compression process sometimes, and security is relatively poor, and it is difficult to make.
Membrane separation process oil gas recovery technology is in the research and development as a new technology, especially high performance membrane material is developed.At present, useful organic film separates recovery VOC both at home and abroad, but film is short service life, and investment and operating cost are bigger.
The absorption process oil-gas recovery method promptly passes through oil gas---and air Mixture contacts with absorbent, according to the different solubility of different component in absorbent, be that oil-gas component is dissolved in this absorbent formation solution (rich absorbent), undissolvable constituent of air then is retained in the gas phase, so the component of former mist is separated.Used kerosene, light diesel fuel as absorbent in the past both at home and abroad, and absorbed the rate of recovery low (being about 90%), and be difficult to desorption and regeneration at normal temperatures and pressures, so can't be considered as independent complete recovery technology.
Domestic typical example has the GASOLINE VAPOR RECOVERY DURING TANK CAR LOADING device that utilizes light diesel fuel to make absorbent.This device is simple to operate, but there are some problems in device: 1. can only suit to be difficult to treat as complete separate equipment in the inner use of the oil plant that catalytic cracking unit is arranged, range of application is restricted; 2. absorbent (light diesel fuel) this as light-end products, the rate of recovery is on the low side (about 90%), and self volatilizing loss amount is big, especially uses in summer; 3. light diesel fuel can't be regenerated, and only as disposable use, consumption is big.
The domestic example that utilizes low temperature kerosene to make the device for recovering oil and gas of absorbent in addition.This technology and present technique are inequality, and the rate of recovery is about 90%, and recovering effect is than present technique difference.This device is being done to consider preferably aspect the comprehensive utilization energy, but remain in some problems, as desorb kerosene under the temperature about 50 ℃, kerosene itself also will have the part evaporating loss, and desorption effect is not so good, therefore after kerosene repeatedly recycled, assimilation effect can reduce greatly and will often add kerosene.In addition, the gasoline as first order absorbent does not have desorb, yet not renewal, meeting inefficacy after operation a period of time.This device also should be noted precooling dehydration and insulation processing, and cost of investment and operating cost are all higher.This device also is not suitable for the occasion that high throughput oil gas reclaims.
Retrieved domestic and international database according to the technology of the present invention characteristics.Find that the patent and the report that adopt active carbon adsorption to reclaim oil gas are more at home and abroad, and the report of absorption process oil gas recovery technology is less.The patent of absorption method recovery oil gas and report and technology path of the present invention and mechanism are all inequality.
Summary of the invention
The object of the invention provides method and the device that the oil gas absorption is reclaimed under a kind of normal temperature and pressure conditions.Promptly under normal temperature and pressure conditions, utilize distinctive absorbent, in the absorption tower, carry out the recovery that separates of oil gas and air.
The technical scheme that realizes the object of the invention is:
Whole oil gas removal process can be divided into three parts: absorption tower absorption and separation → separate the cucurbitula desorb to concentrate → recovery tower absorption recovery is specially:
(1) utilizes closed loading oil filling riser and oil gas gas gathering system, oil storage and transportation equipment such as rail tank car are received and dispatched the oil gas and the air Mixture of oily process generation and guided to gas recovery system for oil;
(2) utilize high-efficiency absorbent (poor absorbent) to absorb the oil gas that light-end products discharge vaporizations such as reclaiming gasoline comes out in the absorption tower, absorbent is got to the top, absorption tower by solvent pump, and unabsorbed air enters atmosphere from floss hole;
(3) rich absorbent behind the absorption oil gas carries out vacuum desorption regeneration in jar is crouched in desorb, thereby absorbent is recycled;
(4) high-concentration oil vapor that desorbs of rich absorbent enters recovery tower and is absorbed by the liquid poor gasoline body that poor petrol pump is sent here, and the rich gasoline after the absorption is returned original oil tank by rich petrol pump or can directly be used;
(5) tail gas in the recovery tower reenters the absorption tower and is recycled absorption.
Wherein, advance the oil gas and the air Mixture volume flow Q1 on absorption tower, the absorbent volume flow Q2 that enters the absorption tower among the present invention, the ratio that advances the gasoline volume flow Q 3 of recovery tower is: Q1: Q2: Q3=1: (0.1~0.2): (0.03~0.08).The used absorbent of the present invention is organic solvent or product oil, or both mixtures.This absorbent can add a small amount of static conducting agent, defrother.This absorbent not with oil gas generation chemical action.
Device of the present invention comprises: closed loading oil filling riser, oil storage and transportation equipment (as rail tank car, automobile oil truck), absorption tower, solvent pump, desorb jar for sleeping in, vavuum pump, recovery tower, rich petrol pump, poor petrol pump, it is characterized in that being provided with for sleeping in jar of desorb, it is 2~4 layers of dividing plate that its inside is provided with, this dividing plate all has constant slope, and direction difference, the gradient are 0.01~0.02.Can be welded with the low weir plate in some roads on this dividing plate, at the high-end baffle plate that is provided with of dividing plate, permeability cell can be selected to be provided with in the centre.Be filled with the demist filler in for sleeping in jar of outlet of desorb, the bottom is provided with poor absorbent outlet.
Each installs annexation: (1) rail tank car is by receiving and dispatching oil with the closed loading oil filling riser, and rail tank car discharging gas is connected with the bottom, absorption tower by discharge; (2) top, absorption tower is connected with the solvent pump port of export, and the bottom is connected with desorb tank top for sleeping in, and top is connected with floss hole; (3) desorb pot bottom for sleeping in is connected with the solvent pump entrance point, and another top (outlet side) is connected with the vavuum pump entrance point; (4) the recovery tower bottom is connected with the vacuum pump outlet end, and the bottom is connected with rich petrol pump entrance point, and top is connected with the poor petrol pump port of export, and the tail gas that top discharge goes out turns back to the bottom, absorption tower and is recycled absorption.
Low weir plate in the above-mentioned desorb jar for sleeping in can be as forms such as dentation baffle plates, and its top edge is processed into zigzag, and bottom is welded on the dividing plate, high 5~8mm.
Described vavuum pump is a liquid-ring vacuum pump, its desorb vacuum: 〉=0.097MPa.For reaching this vacuum, the liquid-ring vacuum pump sealing fluid is the mixed liquor (wherein water quality content is not higher than 10%) of ethylene glycol or ethylene glycol and water.
Sealing fluid is drawn back into desorb and goes in crouching jar in the vavuum pump when preventing system-down or accidental shutdown, can crouch in vavuum pump and desorb and set up surge tank between the jar and be used for filling sealing fluid temporarily.
Between recovery tower and vacuum pump outlet end, knockout drum is set is used for separate vacuum pump seal liquid and oil gas, the further separation oil and gas of demist filler is set on knockout drum top.
Provide poor gasoline and storage rich gasoline for convenience, oil tank can be set.
The invention has the advantages that:
(1) oil gas absorbs recovery at normal temperatures and pressures and is intermittent operation, can save equipment investment and operating cost.
(2) rate of recovery height of the present invention, operating flexibility is big, and treatment media is conventional oil storage and transportation process discharging oil gas, promptly oil gas is not had specific (special) requirements.
(3) the present invention can association three wastes.The present invention can prevent environmental pollution and the fire explosion hidden danger that oil gas brings, but energy savings also.
Description of drawings
Fig. 1 reclaims the embodiment schematic diagram for oil gas absorbs.
Fig. 2 implements illustration for desorb jar structure for sleeping in.
1-1 closed loading oil filling riser, 1-2 rail tank car, 1-3 absorption tower, 1-4 solvent pump
For sleeping in jar of 1-5 desorb, 1-6 surge tank, 1-7 vavuum pump, 1-8 knockout drum, 1-9 recovery tower
The rich petrol pump of 1-10, the poor petrol pump of 1-11,1-12 oil tank, 1-13 absorption tower delivery pipe
The poor absorbent outlet of 2-1, for sleeping in jar of 2-2 desorb, 2-3 baffle plate, the import of 2-4 rich absorbent
The 2-5 dividing plate, 2-6 dentation baffle plate, 2-7 permeability cell, 2-8 demist filler, 2-9 oil gas vent
The specific embodiment
As shown in Figure 1, the embodiment of the invention comprises: closed loading oil filling riser 1-1, oil storage and transportation equipment (as rail tank car, automobile oil truck) 1-2, absorption tower 1-3, solvent pump 1-4, desorb jar 1-5, a surge tank 1-6 for sleeping in, vavuum pump 1-7, knockout drum 1-8, recovery tower 1-9, rich petrol pump 1-10, poor petrol pump 1-11, oil tank 1-12.A desorb jar 1-5 for sleeping in is a key equipment among the present invention, and the embodiment structure as shown in Figure 2.It is 2~4 layers of dividing plate that its inside is provided with, as dividing plate 2-5.This dividing plate all has constant slope, and the direction difference, and the gradient is 0.01~0.02.Be welded with some road dentation baffle plate 2-6 on this dividing plate.Dentation baffle plate 2-6 top edge is processed into zigzag, and bottom is welded on the dividing plate securely, and can allow a small amount of seepage.At the high-end baffle plate 2-3 that is provided with of dividing plate, permeability cell 2-7 can be selected to be provided with in the centre.A for sleeping in jar of outlet 2-9 is filled with demist filler 2-8 in desorb, and the bottom is provided with poor absorbent outlet 2-1.
As Fig. 1, each device connection is described below: (1) rail tank car 1-2 is by receiving and dispatching oil with closed loading oil filling riser 1-1, and rail tank car 1-2 discharging gas is connected with 1-3 bottom, absorption tower by discharge; (2) 1-3 top in absorption tower is connected with the solvent pump 1-4 port of export, and for sleeping in jar of 1-5 top in bottom and desorb is connected, and top is connected with floss hole 1-13; (3) for sleeping in jar of 1-5 bottom of desorb is connected with solvent pump 1-4 entrance point, and another top (outlet side) is connected with surge tank 1-6 import; (4) vavuum pump 1-7 entrance point is connected with surge tank 1-6 outlet, and the port of export is connected with knockout drum 1-8 top inlet end; (5) recovery tower 1-9 bottom is connected with knockout drum 1-8 top exit end, and the bottom is connected with rich petrol pump 1-10 entrance point, and top is connected with the poor petrol pump 1-11 port of export, and the tail gas that top discharge goes out turns back to 1-3 bottom, absorption tower and is recycled absorption; (6) oil tank 1-12 is connected with the rich petrol pump 1-10 port of export and poor petrol pump 1-11 entrance point.
The oil gas recycling step is:
(1) utilizes closed loading oil filling riser 1-1 and oil gas gas gathering system, the bottom of the absorption tower 1-3 that oil gas that oil storage and transportation equipment charge of oil processes such as rail tank car 1-2 are produced and air Mixture are guided to gas recovery system for oil.
(2) utilize high-efficiency absorbent (poor absorbent) in the 1-3 of absorption tower, to absorb the oil gas that light-end products discharge vaporizations such as reclaiming gasoline comes out.Absorbent is got to the top, absorption tower by solvent pump 1-4.Unabsorbed air enters atmosphere from floss hole 1-13.Liquid level among the 1-3 of absorption tower is controlled by control valve, thereby makes its liquid level remain on stable level.
(3) rich absorbent behind the absorption oil gas utilizes the method for vacuum desorption to carry out desorption and regeneration in jar 1-5 is crouched in desorb, thereby absorbent is recycled.
(4) high-concentration oil vapor that is come out by vavuum pump 1-7 vacuum desorption through surge tank 1-6, enter knockout drum 1-8 and recovery tower 1-9.Utilize knockout drum 1-8 to be used for separate vacuum pump seal liquid and oil gas, the further separation oil and gas of demist filler is set on knockout drum 1-8 top.
(5) enter recovery tower 1-9 from the oil gas of knockout drum 1-8 and absorbed by the poor gasoline body of liquid state, the rich gasoline after the absorption is returned original oil tank 1-12 or is directly sent use outside, thereby realizes the recovery of oil gas.Poor gasoline, rich gasoline are realized carrying by pump 1-11,1-10.Liquid level among the recovery tower 1-9 is controlled by control valve, thereby makes its liquid level remain on stable level.
(6) there are unabsorbed oil gas of part and air Mixture (tail gas) to reenter absorption tower 1-2 and be recycled absorption among the recovery tower 1-9.
Advance the oil gas and the air Mixture volume flow Q1 on absorption tower, the absorbent volume flow Q2 that enters the absorption tower among the present invention, the ratio that advances the gasoline volume flow Q 3 of recovery tower is: Q1: Q2: Q3=1: (0.1~0.2): (0.03~0.08).The used absorbent of the present invention is organic solvent or product oil, or both mixtures.This absorbent can add a small amount of static conducting agent, defrother.This absorbent not with oil gas generation chemical action.This device absorbs rate of recovery η technical characterictic and is illustrated in
Table 1.
Table 1 absorbs rate of recovery η technical characterictic example
??Q1∶Q2∶Q3 ??η/% ??Q1∶Q2∶Q3 ??η/% ??Q1∶Q2∶Q3 ??η/%
??1∶0.1∶0.03 ??1∶0.1∶0.05 ??1∶0.1∶0.08 ??≥92.2 ??≥92.8 ??≥90 ??1∶0.15∶0.03 ??1∶0.15∶0.05 ??1∶0.15∶0.08 ??≥93 ??≥94.7 ??≥92.3 ??1∶0.2∶0.03 ??1∶0.2∶0.05 ??1∶0.2∶0.08 ??≥94.4 ??≥95 ??≥94

Claims (7)

1. oil gas absorbs the method that reclaims, and it is characterized in that whole oil gas removal process can be divided into three parts: absorption tower absorption and separation → separate the cucurbitula desorb to concentrate → recovery tower absorption recovery is specially:
(1) utilizes closed loading oil filling riser and oil gas gas gathering system, oil storage and transportation equipment is received and dispatched the oil gas and the air Mixture of oily process generation and guided to gas recovery system for oil;
(2) utilize absorbent to absorb in the absorption tower and reclaim the oil gas that the light-end products discharge vaporization comes out, absorbent is got to the top, absorption tower by solvent pump, and unabsorbed air enters atmosphere from floss hole;
(3) rich absorbent behind the absorption oil gas carries out vacuum desorption regeneration in jar is crouched in desorb, thereby absorbent is recycled;
(4) high-concentration oil vapor that desorbs of rich absorbent enters recovery tower and is absorbed by the liquid poor gasoline body that poor petrol pump is sent here, and the rich gasoline after the absorption is returned original oil tank by rich petrol pump or directly used;
(5) tail gas in the recovery tower reenters the absorption tower and is recycled absorption;
Wherein, advance the oil gas and the air Mixture volume flow Q1 on absorption tower, the absorbent volume flow Q2 that enters the absorption tower, the ratio that advances the gasoline volume flow Q 3 of recovery tower is: Q1: Q2: Q3=1: (0.1~0.2): (0.03~0.08).
2. oil gas according to claim 1 absorbs the method that reclaims, and it is characterized in that described absorbent is organic solvent or product oil or both mixtures.
3. realize that the described oil gas of claim 1 absorbs the device of the method that reclaims, comprise: the closed loading oil filling riser, oil storage and transportation equipment, the absorption tower, solvent pump, for sleeping in jar of desorb, vavuum pump, recovery tower, rich petrol pump and poor petrol pump, it is characterized in that being provided with for sleeping in jar of desorb, its inside is provided with 2~4 layers of dividing plate, this dividing plate all has constant slope, and direction difference, the gradient is 0.01~0.02, be welded with the low weir plate in some roads on this dividing plate, the high-end baffle plate that is provided with at dividing plate, permeability cell can be selected to be provided with in the centre, is filled with the demist filler in for sleeping in jar of outlet of desorb, and the bottom is provided with poor absorbent outlet; Wherein respectively installing annexation is: (1) oil storage and transportation equipment is received and dispatched oil by the closed loading oil filling riser, and oil storage and transportation equipment exhausting gas is connected with the bottom, absorption tower by discharge; (2) top, absorption tower is connected with the solvent pump port of export, and the bottom is connected with desorb tank top for sleeping in, and top is connected with floss hole; (3) desorb pot bottom for sleeping in is connected with the solvent pump entrance point, and another outlet side, top is connected with the vavuum pump entrance point; (4) the recovery tower bottom is connected with the vacuum pump outlet end, and the bottom is connected with rich petrol pump entrance point, and top is connected with the poor petrol pump port of export, and the tail gas that top discharge goes out turns back to the bottom, absorption tower and is recycled absorption.
4. device according to claim 3 is characterized in that the low weir plate in the desorb jar for sleeping in is the dentation baffle plate, and its top edge is processed into zigzag, and bottom is welded on the dividing plate, high 5~8mm.
5. device according to claim 3 is characterized in that described vavuum pump is a liquid-ring vacuum pump, its desorb vacuum: 〉=0.097MPa.
6. device according to claim 3 is characterized in that setting up surge tank between vavuum pump and desorb jar for sleeping in.
7. device according to claim 3 is characterized in that between recovery tower and vacuum pump outlet end knockout drum being set.
CNB2005101230162A 2005-12-13 2005-12-13 Oil gas absorptive reclaiming method and apparatus CN100369653C (en)

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CN1935319B (en) * 2006-09-15 2010-09-01 江苏工业学院 Oil gas adsorption recovering method and apparatus utilizing heating desorption
CN1935318B (en) * 2006-09-15 2010-06-16 江苏工业学院 Ultrasonic disturbance-increasing oil gas absorption recovering method and apparatus
CN105536280A (en) * 2008-10-27 2016-05-04 三菱电机株式会社 Gasoline steam recovery apparatus
CN102068875B (en) * 2009-11-19 2013-05-01 中国石油化工股份有限公司 Oil gas absorption method
CN101929884B (en) * 2010-08-06 2012-05-09 西安交通大学 Flow measuring device for gas-liquid two-phase fluid and measuring method thereof
CN101935541B (en) * 2010-08-06 2013-09-04 宋晓轩 Method for reclaiming oil and gas in tank car
CN102443405B (en) * 2010-10-09 2014-02-19 中国科学院理化技术研究所 Peak regulating method and device for oil and gas condensing recovery
CN102441308B (en) * 2010-10-12 2014-04-02 中国石油化工股份有限公司 Oil gas comprehensive recovery method
CN102274676A (en) * 2011-06-10 2011-12-14 常州大学 Microwave and vacuum integration based desorption device and its gasoline vapor absorption recovery method
CN102295118B (en) * 2011-07-29 2013-03-13 海湾环保工程(北京)股份有限公司 Circulating type oil-gas vacuum adsorption and recovery system comprising crude-oil storage tank
CN102380288B (en) * 2011-09-22 2014-04-30 常州大学 Oil and gas recovery method by absorption-adsorption integrated technology and its device
CN102489122B (en) * 2011-12-13 2013-10-09 上海神明控制工程有限公司 Sulfur-bearing oil and gas mixture recovery process and device
CN105084289A (en) * 2015-08-16 2015-11-25 常州大学 Novel efficient absorption type oil and gas recovery system for gas station
CN105194977A (en) * 2015-09-25 2015-12-30 杭州宝诺化工科技有限公司 Oil gas recovery apparatus with recycling function

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