CN104944619B - Electric Desalting Wastewater deoiling method in heavy crude process - Google Patents

Electric Desalting Wastewater deoiling method in heavy crude process Download PDF

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CN104944619B
CN104944619B CN201510362208.2A CN201510362208A CN104944619B CN 104944619 B CN104944619 B CN 104944619B CN 201510362208 A CN201510362208 A CN 201510362208A CN 104944619 B CN104944619 B CN 104944619B
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oil
water
heavy crude
desalting
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CN104944619A (en
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白志山
朱勇
杨晓勇
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East China University of Science and Technology
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Abstract

The invention provides Electric Desalting Wastewater deoiling method in a kind of heavy crude process, this method comprises the following steps:(a) heavy crude that with the addition of demulsifier is sent into electrical desalter (1) and carries out desalting and dewatering processing;(b) heavy crude handled through desalting and dewatering is sent into downstream process, and de- solid processing is carried out by being sent into after the Electric Desalting Wastewater cooling of gained in cyclone separator (6);(c) bottom underflow containing the solid impurity effluent obtained after de- solid processing is sent into Water Tank (4);And (d) will be sent into coalescer (3) after the further cooling processing of top overflow effluent progress obtained after de- solid processing, be demulsified coalescence and water-oil separating are carried out in coalescer (3), obtained aqueous phase is sent into sewage treatment plant, obtained oil phase is sent into electrical desalter (1) outlet, and downstream process is sent into together with the heavy crude handled through desalting and dewatering.

Description

Electric Desalting Wastewater deoiling method in heavy crude process
Technical field
The invention belongs to field of waste water treatment, is related to a kind of method of wastewater treatment.It is former more specifically to a kind of heavy The deoiling method of caused Electric Desalting Wastewater in oily electro-desalting preprocessing process.
Background technology
The unconventional heavy crude resource such as viscous crude and tar sand is relatively abundant in the world.According to statistics, global viscous crude and tar sand Reserves are about 400Gt, are 2.7 times of conventional crude recoverable reserves.At present, most conventional crudes have put into exploitation, and adopt It is of a relatively high to go out degree, conventional crude yield will enter decline period, but the hair with World Economics especially headed by China National economic fast development, energy-output ratio will increase considerably in exhibition, and this will enter decline period with conventional oil field yield Huge imbalance between supply and demand is formd, therefore, the huge breach of future source of energy will rely primarily on the unconventional heavy crude such as viscous crude Make up, processing heavy crude has turned into an important directions of the World Refining industry.
The crude oil that most of oil fields are produced in the world all contains water, and contained inorganic salts are dissolved in water in crude oil.It is former Oily saliferous is aqueous to cause very big harm to crude oil accumulating, processing, product quality and equipment etc., increases the load of equipment and moves Power, heat energy, cooling-water consumption, influence the normal operating of destilling tower.Salt in crude oil, with moisture evaporation, salt branch is changing Salt crust is formed on hot device, influences to conduct heat, blocking pipeline, and also some salts can cause to corrode to equipment.Metal in salt enters Enter in heavy distillate or residual oil, poison catalyst, influence secondary processing of raw material quality and product quality, poor product quality also can be right Environmental protection impacts.Therefore, after crude oil enters oil plant, it is necessary to first carry out desalting and dewatering processing, be not more than water content 0.3% (volume fraction), salt content are not more than 5mg/L.In crude oil, colloid, asphalt content it is most be heavy crude, its In containing substantial amounts of sulfide, nitride, solid impurity etc., have a strong impact on crude quality, and solid impurity is in heavy crude After electro-desalting pretreatment, it can be deposited under gravity in Electric Desalting Wastewater, colloid, asphalitine, aphthenic acids etc. are genuine milks Agent, they can form more firm diaphragm in oil-water interfaces, emulsion is in stable state, and microwax, fine sand, The solid matter of the fine dispersions such as clay, is easily attracted on oil-water interfaces, forms WO emulsion, these are all unfavorable In the follow-up water-oil separating processing of Electric Desalting Wastewater, and more solid impurity will also result in mill to the equipment in subsequent treatment Damage, blocking etc. influence.
Technology of electric de-salting has as crude oil pretreating process and provides quality raw materials for downstream unit, mitigate equipment scaling And corrosion, energy consumption is reduced, catalyst consumption is reduced and improves the effect such as product quality, be the indispensable technique of oil plant. But meeting externally discharged waste water, the Electric Desalting Wastewater have the complex components such as saliferous, oil-containing and the demulsifier of addition during electro-desalting, The point desalination sewage for being reluctant a kind of sewage, the particularly more heavy crude containing solid impurity is even more to be difficult to handle. Conventional Gravity separate equipment, such as oil interceptor, swash plate oil expeller, occupation area of equipment is big, and cost of investment is high, and effect It is bad.And the equipment such as flotation tank, filter requires higher to operation, control is difficult.Centrifugal separation equipment belongs to dynamic equipment, energy consumption Greatly, also turn into the problems such as noise, stability and restrict its development factors.The traditional oil removal of oil plant, flotation, biochemical processing process, Discharge of wastewater requirement is not often reached, sump oil processing pressure is big.Flocculation electro multiphase catalysis oxidizing process, flocculation-solvent extraction, Multi-stage absorption method etc., processing cost is high, and some techniques can also produce secondary pollution.
Within the current and future time, heavy crude will turn into the important sources of China's oil refining industry, but heavy crude Of poor quality, impurity is more, particularly more difficult to Electric Desalting Wastewater processing.Therefore, this area is a kind of green there is an urgent need to develop Color is efficient, cost of investment is low, disposal ability is strong, suitable for promoting, simple and reliable process is effectively treated to it.
The content of the invention
The invention provides Electric Desalting Wastewater deoiling method in a kind of novel heavy crude process, so as to solve Problems of the prior art.
The invention provides Electric Desalting Wastewater deoiling method in a kind of heavy crude process, this method includes following step Suddenly:
(a) heavy crude that with the addition of demulsifier is sent into electrical desalter and carries out desalting and dewatering processing;
(b) heavy crude handled through desalting and dewatering is sent into downstream process, and by after the Electric Desalting Wastewater cooling of gained It is sent into cyclone separator and carries out de- solid processing;
(c) bottom underflow containing the solid impurity effluent obtained after de- solid processing is sent into Water Tank;And
(d) coalescer is sent into after the top overflow effluent obtained after de- solid processing being carried out into further cooling processing, Be demulsified coalescence and water-oil separating are carried out in coalescer, obtained aqueous phase is sent into sewage treatment plant, and it is de- that obtained oil phase is sent into electricity Salt cellar is exported, and downstream process is sent into together with the heavy crude handled through desalting and dewatering.
In one preferred embodiment, in step (b), Electric Desalting Wastewater is through two-stage heat exchanger and cools to 100 It is sent into after DEG C -70 DEG C in cyclone separator and carries out de- solid processing.
In another preferred embodiment, in step (d), the top overflow that will be obtained after de- solid processing is discharged Coalescer is sent into after being further cooled to less than 40 DEG C in thing feeding heat exchanger.
In another preferred embodiment, in step (b), the cyclone separator is by single or more eddy flow Core pipe composes in parallel, or is composed in series by multiple cyclone separators.
In another preferred embodiment, in step (b), the entrance velocity of the cyclone separator is 1-20m/ S, import are reduced to 0.1-0.6MPa with water out pressure.
In another preferred embodiment, in step (d), the coalescer is gathering de-oiling type high efficiency oil-water Separator, it is made up of shell and internals, wherein the internals include coalescing layer, folded plate separator layer and oleophobic dielectric layer, and It is replaceable.
In another preferred embodiment, the coalescing layer is by 20-30% polypropylene fibres, 60-70% metals Fiber and 5-10% is teflon fibre braided forms, in terms of the weight of the coalescing layer.
In another preferred embodiment, the coalescing layer uses Ω types, X-type or Y type type of weaves.
In another preferred embodiment, in step (d), oil droplet inhaled using lipophilic material it is attached to it, with Contact and mass transfer between hardening constituent, improve water-oil separating efficiency.
In another preferred embodiment, in step (a), the demulsifier is selected from the group:Water-soluble demulsifier, Oil-soluble demulsifier or its mixture, its dosage are 1-30ug/g;Electrical desalter is more than two-stage or two-stage to be used in series.
Brief description of the drawings
Fig. 1 is Electric Desalting Wastewater deoiling method in the heavy crude process according to an embodiment of the invention Process chart.
Fig. 2 is the coalescer schematic diagram according to an embodiment of the invention.
Embodiment
Present inventor will turn into China's oil refining industry by in-depth study extensively for heavy crude in future Primary raw material this situation, with reference to prior art, propose Electric Desalting Wastewater deoiling method in a kind of heavy crude process, Realize and the desalting and dewatering of heavy crude is handled, and by modes such as cyclone de-solid, coalescent deoilings, efficiently solve heavy crude The problems such as Electric Desalting Wastewater solid impurity is more, sewage oil removal treatment is difficult, oil recovery utilizes.
The present invention technical concept be:First desalination will be carried out in heavy crude electrical desalter under certain operating conditions to take off Water operates, and to obtain good effect, adds demulsifier, de- rear crude oil enters downstream process;Electric Desalting Wastewater is using eddy flow point De- solid processing is carried out from device, solid impurity contained therein is gone out, is easy to being smoothed out for subsequent technique;Then by electro-desalting Sewage is sent into coalescer, carries out removal operation, and the crude oil of oil phase outlet is sent into electrical desalter outlet and reclaimed, and aqueous phase is sent into dirty Water treatment plant.
The invention provides Electric Desalting Wastewater deoiling method in a kind of heavy crude process, this method includes following step Suddenly:
(a) heavy crude that with the addition of demulsifier is sent into electrical desalter and carries out desalting and dewatering processing;
(b) heavy crude handled through desalting and dewatering is sent into downstream process, and by after the Electric Desalting Wastewater cooling of gained It is sent into cyclone separator and carries out de- solid processing;
(c) bottom underflow containing the solid impurity effluent obtained after de- solid processing is sent into Water Tank;And
(d) coalescer is sent into after the top overflow effluent obtained after de- solid processing being carried out into further cooling processing, Be demulsified coalescence and water-oil separating are carried out in coalescer, obtained aqueous phase is sent into sewage treatment plant, and it is de- that obtained oil phase is sent into electricity Salt cellar is exported, and downstream process is sent into together with the heavy crude handled through desalting and dewatering.
In the present invention, electrical desalter can be more than two-stage or two-stage to be used in series, and the electricity of upper level aqueous phase outlet takes off Salt sewage is directly entered blowdown pipeline and enters next stage electrical desalter into downstream wastewater processing line, oil phase outlet crude oil.According to Handle crude oil amount and for the requirement of aqueous salt content, can suitably increase electrical desalter series, increase disposal ability and dewatering and desalting Rate.
In the present invention, electrical desalter uses oil phase feeding manner, oil-water interfaces can be maintained stable so that Electric Desalting Wastewater Middle oil content reduces;If taking aqueous phase feeding manner, small oil droplet can be penetrated into aqueous phase due to diffusion in crude oil, cause electricity Desalination sewage is of poor quality, increases sewage disposal difficulty.
In the present invention, demulsifier is water-soluble demulsifier, or oil-soluble demulsifier, or the mixture of two kinds of demulsifiers; Before the position for adding demulsifier is electrical desalter entrance.Based on crude emulsification degree adds appropriate demulsifier, and in general is broken Emulsion dosage is 1-30ug/g.Because heavy crude is more containing solid impurity, these solid impurities are natural emulsifying agents, can be promoted Stable emulsion is formed, addition demulsifier can abolish its emulsification, and water-oil separating is highly efficient fast during electro-desalting Speed, solid impurity can more settle down, and ensure that de- rear crude quality is higher.
In the present invention, when Electric Desalting Wastewater flows out from electrical desalter, its temperature is higher, typically at 130 DEG C or so, warp The cooling of two-stage heat exchanger is handled, and the temperature made into the Electric Desalting Wastewater of cyclone separator is 100 DEG C -70 DEG C;Electric Desalting Wastewater After cyclone outflow, being again introduced into heat exchanger, further cooling is handled, and its temperature is reduced to less than 40 DEG C;Subsequently into poly- After tying device water-oil separating, sewage can reach the temperature standard of sewage treatment plant.
In the present invention, cyclone separator is composed in parallel by multiple eddy flow core pipes, or by multiple cyclone separator series connection groups Into cyclone inlet speed is 1-20m/s, and import is reduced to 0.1-0.6MPa with water out pressure.For solid in Electric Desalting Wastewater The processing of body impurity, the modes such as gravitational settling, filtering can be used, but time-consuming, and floor space is big, and ineffective, and uses Cyclone separator, it is to utilize centrifugal sedimentation principle separation solid particle.It is most effective, honest and clean for the low solid-liquid system of solids content The method of valency is to use cyclone separator, and its operation flux is big, and applicability is extensive, and simple in construction, strong adaptability, easy care can High by property, separative efficiency is high, and operation pressure drop is small, and energy consumption is low.
In the present invention, take off the necessity handled admittedly and contain the days such as colloid, asphalitine, aphthenic acids in Electric Desalting Wastewater Right emulsifying agent, and the solid matter of the fine dispersion such as microwax, fine sand, clay, they can form WO emulsion simultaneously Emulsion stabilization is kept, is unfavorable for Electric Desalting Wastewater water-oil separating processing, and is fibrous material in follow-up coalescer equipment, Gu Body impurity can be resulted in blockage too much, and abrasion etc. is will also result on equipment to be influenceed, so adding cyclone separator carries out de- solid processing It is necessary.
In the present invention, Electric Desalting Wastewater through cyclone separator after handling, and underflow effluent enters Water Tank, wherein containing There are a large amount of solid impurities, be blended in oil-polluted water, natural subsidence is difficult to through fully emulsified, if not being acted upon, not only can Environmental pollution is caused, and one kind of crude oil contained therein is wasted.It is handled using chemical cleaning method, can both be solved Environmental problem, and recyclable petroleum resources.During Chemical cleaning, the process conditions such as the screening of medicament, the temperature of cleaning, time according to Solids content, oil content, moisture content, impurity component after de- solid processing in underflow effluent etc. carry out optimization selection.
In the present invention, coalescer is gathering de-oiling type high efficiency oil/water separator, is made up of shell and internals, wherein interior Part includes coalescing layer, folded plate separator layer and oleophobic dielectric layer, and internals can be changed.Coalescer is compact-sized, small volume, oil removing Efficiency high, movement-less part, service life length, can effectively handle two-phase density contrast and be not less than 0.01g/cm3Suspension or Emulsion.Coalescing layer web block is coiled in an annular manner, and net block diameter D is larger than barrel diameter after coiling shaping, Closely it is connected with cylinder inboard wall by net block elastic network(s) block, prevents gap.Two difference in diameter e are not easy excessive, otherwise cause Installation difficulty, pressure drop increase.
In the present invention, coalescing layer web block axis aligns with cylindrical tube housing axis in coalescer, material flow It can be longitudinally consistent with fibrous layer when dynamic, reduce resistance drop, reduce energy consumption, increased contact area, be easy to coarse separation.Coalescence Layer web block is discontinuous in cylinder to place two pieces, and secondary coalescence idetified separation processing can be achieved.Coalescer is put using horizontal In in support beam.
In the present invention, the coalescing layer in coalescer is by 20-30% polypropylene fibres, 60-70% metallic fibers, 5%- 10% it is teflon fibre braided form, coalescing layer preferentially uses Ω type type of weaves, alternative X-type or Y type type of weave. It is mainly oil emulsion in the Electric Desalting Wastewater of heavy crude, oil droplet size is small, mainly 10 microns, and it is big to remove difficulty.Place When managing Electric Desalting Wastewater, using such a combination of materials and type of weave, small oil droplet, especially 10 microns oil can be trapped Drop, especially suitable for carrying out removal operation, high treating effect to heavy crude oil electric desalting sewage.
In the present invention, demulsification coalescence and oil water separation process are to the micro- of selected coarse material using water and oil The angle of wetting on surface is different with surface tension, small particle is departed from after the surface aggregate of material is grown up on its surface Floating or sinking, so as to realize separation purpose.When liquid at the uniform velocity flows through oleophylic fiber, oil droplet in oil-in-water/water-in-oil emulsion Soaking and adhere in oleophilic drainage fiber, constantly coalescence is grown up, and when water droplet flows through, the small oil droplet in water is trapped by oleophylic fiber, Mass-transfer efficiency is improved, water-oil separating is efficiently rapid, and demulsification is obvious.
In the present invention, when in coalescer liquid flow it is out-of-date, its pressure loss is 0.1-0.3MPa.
In the present invention, keep electro-desalting during proper moisture content be water droplet coalescence, crude oil electric desalting dewatering must Condition is wanted, washing water consumption accounts for the 1-10% of crude oil volume.If injecting excessive washings, electric breakdown phenomena is also easy to produce, influences electricity Desalting and dewatering operates, and reduces equipment capacity, increase water rate, power consumption.
In the present invention, the oil phase after being coalesced in coalescer is sent into electrical desalter outlet, under entering together with de- rear crude oil Trip technique, realizes the recycling of Electric Desalting Wastewater Crude Oil, and good economy performance is green.
Heavy crude is pre-processed, after desalting and dewatering using the inventive method, water content is less than 0.3% (volume integral Number), salt content is less than 5mg/L, and oil content of the Electric Desalting Wastewater after oil removal treatment is less than 100mg/L.
Below referring to accompanying drawing.
Fig. 1 is Electric Desalting Wastewater deoiling method in the heavy crude process according to an embodiment of the invention Process chart.As shown in figure 1, the heavy crude of addition demulsifier is sent into electrical desalter 1 after desalting and dewatering, crude oil enters downstream Technique, Electric Desalting Wastewater cool to 100 DEG C -70 DEG C through two-stage heat exchanger 9 and 8, are then sent into cyclone separator 6 by pan feeding pump 7 In carry out de- solid processing, the underflow effluent of cyclone separator 6 is sent into Water Tank 4, and overflow effluent is sent into heat exchanger 5 further Less than 40 DEG C are cooled to, is subsequently sent to carry out removal operation in coalescer 3, after water-oil separating, the crude oil through oil phase outlet is through pump 2 Pumped back electrical desalter exports, and downstream process is sent into together with the heavy crude handled through desalting and dewatering, aqueous phase enters sewage disposal Factory.
Fig. 2 is the coalescer schematic diagram according to an embodiment of the invention.As shown in Fig. 2 the coalescer includes: Charging aperture a, inlet distributor b, rectifier c, a coalescing layer medium d, multilayer folded plate separator e, secondary coalescing layer medium f, Hydrophobic dielectric layer g, oil collecting zone h, light phase export i and heavy out j.
The major advantage of the method for the present invention is:
Technological process is clearly feasible, and equipment is simple, easy to operate, and financial cost is low, and disposal ability is strong;Solid impurity is through rotation Stream separator removes, and operation flux is big, and separative efficiency is high, strong adaptability, and reliability is high, cheap effective, is easy at follow-up oil removing Reason;Water-oil separating is coalesced, efficiently rapid, pure physical process, without adding chemical agent, energy consumption is low, pollution-free;Crude oil is through coalescence Processing, aqueous salt content is very low, recoverable, economic and environment-friendly into oil refining process, green high-efficient.
Embodiment
The present invention is expanded on further with reference to specific embodiment.It should be appreciated, however, that these embodiments are only used for It is bright the present invention and be not meant to limit the scope of the invention.The test method of unreceipted actual conditions in the following example, generally According to normal condition, or according to the condition proposed by manufacturer.Unless otherwise indicated, all percentage and number be by weight Meter.
Embodiment 1:
Electro-desalting pretreatment and Electric Desalting Wastewater removal operation, technological process are carried out to heavy crude using the inventive method As shown in Figure 1.
Oil density is 945.2kg/m3, water content is 0.7% (volume fraction), salt content 152mg/L.Using three-level Electrical desalter, demulsifier are the water-soluble mixture with oil-soluble demulsifier, and demulsifier dosage is 20ug/g, and desalination temperature is 130 DEG C, residence time 3min, fresh washing water injection rate is 8% (volume fraction), and cyclone separator water inlet gauge pressure is 1.3MPa, entrance velocity 15m/s.Coalescing layer uses 25% polypropylene fibre in coalescer, 70% metallic fiber, and 5% poly- four PVF fibrage forms, and type of weave is X-type.Crude oil is after three-level electrical desalter desalting and dewatering, water content 0.18% (volume fraction), salt content 3.9mg/L, Electric Desalting Wastewater warp is de- admittedly, removal operation, and oil content is in heavy out water 65mg/L, light phase export Water in oil amount are less than 0.20% (V/V).
Embodiment 2:
Electro-desalting pretreatment and Electric Desalting Wastewater removal operation, technological process are carried out to heavy crude using the inventive method As shown in Figure 1.
Oil density is 932.5kg/m3, water content is 0.5% (volume fraction), salt content 102mg/L, using two-stage Electrical desalter, demulsifier are the water-soluble mixture with oil-soluble demulsifier, and demulsifier dosage is 15ug/g, and desalination temperature is 110 DEG C, residence time 3min, fresh washing water injection rate is 5% (volume fraction), and cyclone separator water inlet gauge pressure is 1.3MPa, entrance velocity 15m/s.Coalescing layer uses 30% polypropylene fibre in coalescer, 60% metallic fiber, and 10% poly- four PVF fibrage forms, and type of weave is Ω types.Crude oil is after two-stage electrical desalter desalting and dewatering, water content 0.26% (volume fraction), salt content 4.5mg/L, Electric Desalting Wastewater warp is de- admittedly, removal operation, and oil content is in heavy out water 80mg/L, light phase export Water in oil amount are less than 0.25% (V/V).
Embodiment 3:
Electro-desalting pretreatment and Electric Desalting Wastewater removal operation, technological process are carried out to heavy crude using the inventive method As shown in Figure 1.
Oil density is 936.2kg/m3, water content is 0.5% (volume fraction), salt content 96mg/L, using three-level Electrical desalter, demulsifier are the water-soluble mixture with oil-soluble demulsifier, and demulsifier dosage is 20ug/g, and desalination temperature is 145 DEG C, residence time 3min, fresh washing water injection rate is 8% (volume fraction), and cyclone separator water inlet gauge pressure is 1.3MPa, entrance velocity 15m/s.Coalescing layer uses 30% polypropylene fibre in coalescer, 65% metallic fiber, and 5% poly- four PVF fibrage forms, and type of weave is Ω types.Crude oil is after three-level electrical desalter desalting and dewatering, water content 0.11% (volume fraction), salt content 2.6mg/L, Electric Desalting Wastewater warp is de- admittedly, removal operation, and oil content is in heavy out water 46mg/L, light phase export Water in oil amount are less than 0.15% (V/V).
All it is incorporated as referring in this application in all documents that the present invention refers to, it is independent just as each document It is incorporated as with reference to such.In addition, it is to be understood that after the above-mentioned instruction content of the present invention has been read, those skilled in the art can To be made various changes or modifications to the present invention, these equivalent form of values equally fall within the model that the application appended claims are limited Enclose.

Claims (6)

1. Electric Desalting Wastewater deoiling method in a kind of heavy crude process, this method comprise the following steps:
(a) heavy crude that with the addition of demulsifier is sent into electrical desalter (1) and carries out desalting and dewatering processing;
(b) heavy crude handled through desalting and dewatering is sent into downstream process, and will be sent into after the Electric Desalting Wastewater cooling of gained De- solid processing is carried out in cyclone separator (6);
(c) bottom underflow containing the solid impurity effluent obtained after de- solid processing is sent into Water Tank (4);And
(d) coalescer (3) is sent into after the top overflow effluent obtained after de- solid processing being carried out into further cooling processing, Be demulsified coalescence and water-oil separating are carried out in coalescer (3), obtained aqueous phase is sent into sewage treatment plant, and it is de- that obtained oil phase is sent into electricity Salt cellar (1) is exported, and downstream process is sent into together with the heavy crude handled through desalting and dewatering,
Wherein, in step (a), the demulsifier is selected from the group:Water-soluble demulsifier, oil-soluble demulsifier or its mixture, Its dosage is 1-30ug/g;Electrical desalter (1) is more than two-stage or two-stage to be used in series;
In step (d), the coalescer (3) is gathering de-oiling type high efficiency oil/water separator, is made up of shell and internals, its Described in internals include coalescing layer, folded plate separator layer and oleophobic dielectric layer, it is and replaceable;The coalescing layer is by 20- 30% polypropylene fibre, 60-70% metallic fibers and 5-10% is teflon fibre braided forms, with the coalescing layer Weight meter;The coalescing layer uses Ω types, X-type or Y type type of weaves.
2. the method as described in claim 1, it is characterised in that in step (b), Electric Desalting Wastewater through two-stage heat exchanger (8, 9) it is sent into after cooling to 100 DEG C -70 DEG C in cyclone separator (6) and carries out de- solid processing.
3. the method as described in claim 1, it is characterised in that in step (d), the top obtained after de- solid processing is overflow Coalescer (3) is sent into after being further cooled in stream effluent feeding heat exchanger (5) less than 40 DEG C.
4. such as the method any one of claim 1-3, it is characterised in that in step (b), the cyclone separator (6) it is to be composed in parallel by single or more eddy flow core pipe, or is composed in series by multiple cyclone separators.
5. such as the method any one of claim 1-3, it is characterised in that in step (b), the cyclone separator (6) entrance velocity is 1-20m/s, and import is reduced to 0.1-0.6MPa with water out pressure.
6. such as the method any one of claim 1-3, it is characterised in that in step (d), using lipophilic material by oil Drop absorption contact and mass transfer between hardening constituent, improves water-oil separating efficiency on lipophilic material.
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CN204079541U (en) * 2014-05-19 2015-01-07 华东理工大学 A kind of device waste water containing lower concentration sump oil being carried out to degree of depth oil removing

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