CN103011325A - Treating method and device for oil removal of electro-desalting cut water of inferior crude oil and decrement of dirty oil - Google Patents
Treating method and device for oil removal of electro-desalting cut water of inferior crude oil and decrement of dirty oil Download PDFInfo
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- CN103011325A CN103011325A CN2012105368523A CN201210536852A CN103011325A CN 103011325 A CN103011325 A CN 103011325A CN 2012105368523 A CN2012105368523 A CN 2012105368523A CN 201210536852 A CN201210536852 A CN 201210536852A CN 103011325 A CN103011325 A CN 103011325A
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Abstract
The invention provides a method for the oil removal of electro-desalting cut water in the processing process of inferior crude oil. According to the method comprises the following steps that, electro-desalting cut water and light crude oil are mixed by using a centrifugal extraction separation device, and the obtained mixture is separated into an oil phase and saliferous sewage; and the recovered oil phase enters a primary distillation tower or a delayed coking device, and the purified sewage enters an oil separation tank. According to the method disclosed by the invention, the oil concentration of the purified sewage can be controlled to be below 300ppm, the water content of the recovered oil phase can be controlled to be within 0.1% (V/V), and the salt content can be controlled within 5mg/L, so that the sewage treatment cost is reduced, and dirty oil is recycled. The invention also provides a device for the oil removal of electro-desalting cut water. According to the method and device disclosed by the invention, the oil in electro-desalting cut water is effectively removed so that dirty oil is recycled, therefore, the method and device disclosed by the invention have the advantages of strong applicability, compact equipment, low operation cost, and the like.
Description
Technical field
The present invention relates to a kind for the treatment of process and device, treatment process and the device of water oil removing and sump oil decrement cut in especially a kind of crude oil with poor quality electric desalting.
Background technology
Follow the continuous growth of petroleum demand, world's crude resources just is being tending towards in poor quality.It is that density is greater than 0.883g/cm less than 27(that U.S. NPRA regulation meets the API degree
3), sulphur content greater than 15%, TAN is greater than the crude oil of any one index of 1.0mg KOH/g, can be described as crude oil with poor quality.Crude oil with poor quality will become following newly-increased main oils resource.But the processing crude oil with poor quality brings very large difficulty to oil refining enterprise, and because oil quality requires increasingly stringent, Chinese oil refining enterprise is faced with the processing crude oil with poor quality and improves the dual-pressure of oil quality.
GB 8978-1996 " integrated wastewater discharge standard " emission standard is carried out in the sewage discharge of China's desalting in oil refinery waste water, wherein three grades, secondary, first discharge standard COD content can not surpass 500mg/L, 120mg/L, 60mg/L respectively, can cause the COD value high when containing Chuck Steak in the waste water, oil-containing must not surpass 300ppm in the therefore general oil refining enterprise regulation waste discharge.In Crude Oil Processing, when crude oil is the high-quality product phase time, its proportion, viscosity are all less, and the oil refining enterprise production run is steady, the electric desalting apparatus stable operation, and it is less that the water oil-containing is cut in electric desalting, can realize that electric desalting cuts the water qualified discharge.When crude oil is the inferior goods phase time, because crude oil with poor quality proportion, viscosity, sulphur and heavy metal content are all larger, oil property is complicated and changeable, production run, technology controlling and process on oil refining enterprise have all produced great impact, it at first is the impact to electric desalting apparatus, the heaviness of crude oil, in poor quality cause electric desalting equipment operation fluctuation larger, water oleaginousness severe overweight is cut in electric desalting, oil-containing can reach several thousand ppm, reach more than 10% when serious, separation difficulty is in addition because isolated sump oil proportion, viscosity are all very large, difficulty of transportation, easily occluding device pipeline.If these sewage directly enter oil trap, waste crude resources on the one hand, greatly increased on the other hand refinery sump oil, sewage disposal difficulty and cost.Therefore, electric desalting is cut the water oil removing and is of great practical significance in the crude oil with poor quality course of processing.
At present, domestic oil refining enterprises still generally uses " old three covers " technology to carry out sewage disposal, i.e. " sedimentation, oil removal-flotation-biochemistry ", electric desalting is cut the sewage that water enters after the oil trap with other devices and is adopted this technical finesse, isolated sump oil directly enters slop oil tank, enters coker or inject feed line and carry out freshening after processed.But, because slop oil tank just leans on gravity settling to dirty oil dewatering, costs and poor dehydration results, the sump oil water content after the dehydration is high, and coker can only be processed a part; Carry out freshening if inject feed line, can cause that electric desalting apparatus worsens, and forms more sump oil.Along with heavy, crude oil with poor quality are mixed the refining ratio and improved constantly, oil-containing is cut the aggravation of emulsifying water degree, and electric desalting apparatus draining oleaginousness is more and more higher, and a lot of enterprises are difficult to qualified discharge, form up to ten thousand tons sump oil, the tank field is stored pose a big pressure.Therefore, these devices can not satisfy the cleaner production demand.
Efflux a band oil difficult problem of cutting water in order to solve electric desalting, investigators have carried out a large amount of fruitful work.Luoyang Petrochemical adopts the pre-removing equipment for oil of sewage of oil removal and coarse combination; can remove electric desalting and cut most of oil slick in the water; the sump oil re-injection of reclaiming is to the electric desalting apparatus entrance; realize benign cycle; reach more significant enhancing efficiency by relying on tapping internal latent power purpose; but, the sump oil of separating moisture higher (greater than 10%).Sinopec Chang Ling branch office cooperates with China Petroleum Univ. (East-China), use the liquid-liquid rotational flow separation technology to cut the oil concentration of water to reduce electric desalting apparatus at electric desalting apparatus, but the greatest problem of this technology is: moisture up to 80-90% in the sump oil of separating, and, (oil-containing is greater than 5%) is difficult to guarantee separating effect when the water inlet oleaginousness is higher, is not suitable for crude oil with poor quality processing.All there is the high problem of water content in the sump oil that current treatment technology is separated, is difficult to send into primary tower or delayed coking unit and carries out freshening, can only store, and forms a large amount of reluctant heavy sump oils.
East China University of Science successfully utilizes the Centrifugical extraction technology to solve the difficult problem that high-quality crude is cut water band oil, can make in the isolated waste water oleaginousness less than 300PPM.But this technology is not suitable for the processing of crude oil with poor quality, because crude oil with poor quality viscosity, density are all larger, utilize merely the isolated sump oil difficulty of transportation of Centrifugical extraction separator, easily the light phase weir of obstruction extractor, light phase export etc. are located, make equipment sump oil accumulation after operation for some time, in time discharge in the slave unit, can cause the sump oil back mixing when serious, make to separate to be difficult to carry out, utilize the Centrifugical extraction technology can not solve the crude oil with poor quality electric desalting to cut water oil-containing problem therefore merely.
Therefore, oil refining enterprise can be up hill and dale in the urgent need to developing, effectively and the electric desalting that is applicable to crude oil with poor quality of suitable long-term operation cut water technology.
Summary of the invention
Cut water for electric desalting in the crude oil with poor quality course of processing and contain Chuck Steak, sump oil density and viscosity are very large, with the aqueous phase separation difficulty, and isolated sump oil easily stops up the difficult problem of light phase weir, light phase export and transport pipe, the novel method that the present invention proposes a kind of " oil wash ", be about to the electric desalting oil-containing and cut water and mixes with light oil, make inferior heavy oil and light oil dissolving combination formation low density, low viscous oil product, carry out again oily water separation.Present technique makes the sump oil decrement, has alleviated the pressure of sewage work, has optimized processing technology and the flow process of crude oil with poor quality, has solved the problem that prior art exists.
Technical thought of the present invention is:
Utilize the Centrifugical extraction isolation technique that water is cut in the electric desalting that produces in the Crude Oil Processing and carry out oily water separation.When former oil quality is better, directly use the Centrifugical extraction separating device to separate, the existing patent 201110326436.6 of this author is to this process explanation; When crude oil quality is relatively poor, because sump oil proportion, viscosity are all larger, difficulty of transportation, be prone to blockage problem in the process of use Centrifugical extraction separating device, the present invention proposes the novel method of " oil wash ", namely utilizes the Centrifugical extraction separator to use few light oil by the turbulent flow between the centrifugal extractor annular space heavy sump oil in the water to be cut in electric desalting and carries out " oil wash " and carry out afterwards oily water separation again.It is similar to oil property that the isolated sump oil of water is cut in electric desalting, can send into primary tower or delayed coking unit, purifies waste water to enter the downstream unit oil trap and be for further processing.In the Centrifugical extraction separator, with " oil wash " method water is cut in the electric desalting in the crude oil with poor quality course of processing and carried out oily water separation, not only solved the problem of effluent plug Centrifugical extraction tripping device and transport pipe, and can make into the water water temperature and greatly reduce, optimized processing technology and the flow process of crude oil with poor quality.This technology can replace the technology such as gravity settling of the prior art, oil trap.
Solution provided by the invention is specific as follows:
The electric desalting that the electrical oil dewatering salt cellar is discharged is cut water by interchanger (2), air cooler (3), water cooler (4) heat radiation enters Centrifugical extraction separator (6) to 40 ~ 45 ℃ from the heavy liquid inlet, light oil on the lenient side phase entrance enters Centrifugical extraction separator (6), be separated into oil phase under the effect at centrifugal force after two-phase is mixed and purify waste water in Centrifugical extraction separator (6), oil phase enters surge tank (7) from the light phase export of Centrifugical extraction separator (6), after promoting by pump (8), and electric desalting is taken off and is entered primary tower (9) after rear crude oil mixes; Isolated purifying waste water directly enters oil trap (5) from heavy out and is for further processing.
Above-mentioned sewage degrease Centrifugical extraction separator adopts the Centrifugical extraction tripping device structures such as patent CN201020620262.5, CN200910055098.X, but not as limit.Take CN201020620262.5 as example, this Centrifugical extraction separating device comprises the motor that is positioned at the top, the transmission mechanism that connects motor, the rotation axis of connection for transmission mechanism, the head bearing of connection of rotating axle and bearing support and lower bearing and bearing support, inner core, urceolus, be arranged in light phase weir and the heavy phase weir of inner core, be positioned at light phase collecting chamber, light phase export, heavy phase collecting chamber, heavy out, light phase import and the heavy phase import of urceolus, bearing, the bottom blade that is positioned at the vibroshock of rest base and is positioned at the urceolus bottom.
Further, the above-mentioned electric desalting that enters the Centrifugical extraction separator is cut water temp and is controlled at 40 ℃ to 45 ℃.
Further, the above-mentioned de-salted water oil concentration that enters the Centrifugical extraction separator is 550mg/L～20%.
Above-mentioned Centrifugical extraction separator working speed does not have particular determination in principle, can be according to the need of production flexible of reality, and general effective working speed is 500rpm～3000rpm.
The present invention also provide a kind of realize aforesaid method to crude oil with poor quality electric desalting cut the device of water oil removing, comprising:
Be used for the Centrifugical extraction separator (6) that water carries out oil removing is cut in electric desalting, this Centrifugical extraction separating device is provided with a light phase entrance, a heavy liquid inlet, a light phase export and a heavy out, and its heavy liquid inlet is connected with the water dividing gap of electrical desalter (1); Be used for storing the surge tank (7) of separating oil phase, its entrance is connected with the light phase export of Centrifugical extraction separator (6); For delivery of the pump (8) of oil phase, its entrance is connected with oil phase surge tank (7) outlet.
Compared with prior art, the invention has the advantages that:
1, overcome existing electric desalting and cut water deoiling method and the shortcomings such as operation of equipment complexity, weak effect, good separating effect, velocity of separation is fast, and is easy to operate, is fit to long-term operation.
2, initiative proposition " oil wash " method, the oily water separation temperature can be reduced to 40 ℃, but water-content decrease to 0.1% in the isolated sump oil, realized that the on the spot oil removing of water and the recycling of sump oil are cut in electric desalting in the crude oil with poor quality course of processing, optimized processing technology and the flow process of crude oil with poor quality.
3, the sump oil of separating can enter primary tower or delayed coking, thoroughly solves the heavy sump oil problem of oil refining industry.
Description of drawings
Fig. 1 is the device technique schema of preferred embodiment of the present invention, wherein:
1-electrical desalter 2 interchanger 3-air cooler 4-water cooler 5-oil traps 6 Centrifugical extraction separator 7-surge tank 8-pump 9-primary towers
Embodiment
Below in conjunction with specific embodiment, further illustrate content of the present invention.
The proposition of initiative of the present invention " oil wash " method is applied to electric desalting with centrifugal separation process and cuts in the oily water separation of water, has efficiently reclaimed fast crude oil, has reduced oil content of wastewater, has solved the problem that prior art exists.
Below in conjunction with specific examples, further illustrate content of the present invention.
Fig. 1 shows the flow process of electric desalting in the crude oil with poor quality course of processing being cut the water oil removing according to the Centrifugical extraction separator of one embodiment of the present invention.At first, electrical desalter (1) electric desalting is out cut water through interchanger (2), air cooler (3), the rear Centrifugical extraction separator (6) that enters from the heavy liquid inlet of water cooler (4), light oil on the lenient side phase entrance enters Centrifugical extraction separator (6), two-phase enters mixes in the Centrifugical extraction separator (6) and separates, isolated sump oil is discharged from Centrifugical extraction separator (6) light phase export, enter surge tank (7), enter primary tower (9) after the lifting by pump (8); Isolated purifying waste water discharged from heavy out, enters oil trap (5).
Should be understood that these embodiment only to be used for explanation the present invention and be not used in and limit the scope of the invention.The experimental technique of unreceipted actual conditions in the following example, usually according to normal condition, or the condition of advising according to manufacturer.Unless indicate, otherwise all umbers are volume parts that all per-cent is volume percent.
Carry out electric desalting by aforesaid technical process and cut the water oil removing, wherein
1. material properties
Desalination sewage: flow is 2t/h, and temperature is 40 ℃, water-mass density 1000kg/m
3, oil density 945kg/m
3(20 ℃), oily viscosity are 303mm
2/ s (50 ℃), oil-contg 5000ppm
Light oil: gasoline, flow are 0.01t/h, and density is 750kg/m
3(20 ℃)
2. Centrifugical extraction separator roller diameter is 350mm, and motor speed is 800rpm.
3. content assaying method
The oil water content is measured according to GB/T 8929-2006 petroleum products aquametry;
The oil saltiness is measured according to SY/T 0536-2008 crude oil desalting content determination;
The water oil concentration is measured according to GB/T16488-1996 water-quality petroleum and animals and plants Determination of oil infrared spectrophotometry.
4. effect
After the processing of Centrifugical extraction separator, the oleaginousness of purifying waste water is 50ppm, and oil removal efficiency has reached 99%, saltiness is 2mg/L, and light phase export sump oil water content is 0.05%, and each leading indicator is good, similar to oil property, can re-injection to primary tower, reduce the crude oil waste.
1. material properties
Desalination sewage: flow is 2.5t/h, and temperature is 40 ℃, water-mass density 1000kg/m
3, oil density 950kg/m
3(20 ℃), oily viscosity are 290mm
2/ s (50 ℃), oil-contg 1% (V/V) light oil: kerosene, flow are 0.025t/h, density is 800kg/m
3(20 ℃)
2. Centrifugical extraction separator roller diameter is 450mm, and motor speed is 1500rpm.
3. content assaying method
The oil water content is measured according to GB/T 8929-2006 petroleum products aquametry;
The oil saltiness is measured according to SY/T 0536-2008 crude oil desalting content determination;
The water oil concentration is measured according to GB/T16488-1996 water-quality petroleum and animals and plants Determination of oil infrared spectrophotometry.
4. effect
After the processing of Centrifugical extraction separator, the oleaginousness of purifying waste water is 200ppm, and oil removal efficiency has reached 99.8%, saltiness is 3mg/L, and light phase export sump oil water content is 0.1%, and each leading indicator is good, similar to oil property, can re-injection to primary tower, reduce the crude oil waste.
Embodiment 3
1. material properties
Desalination sewage: flow is 3t/h, and temperature is 45 ℃, water-mass density 1000kg/m
3, oil density 935kg/m
3(20 ℃), oily viscosity are 300mm
2/ s (50 ℃), oil-contg 5% (V/V)
Light oil: diesel oil, flow are 0.06t/h, and density is 850kg/m3(20 ℃)
2. Centrifugical extraction separator roller diameter is 500mm, and motor speed is 2000rpm.
3. content assaying method
The oil water content is measured according to GB/T 8929-2006 petroleum products aquametry;
The oil saltiness is measured according to SY/T 0536-2008 crude oil desalting content determination;
The water oil concentration is measured according to GB/T16488-1996 water-quality petroleum and animals and plants Determination of oil infrared spectrophotometry.
4. effect
After the processing of Centrifugical extraction separator, the oleaginousness of purifying waste water is 500ppm, oil removal efficiency has reached 99%, saltiness is 4mg/L, light phase export sump oil water content is 0.1%, and each leading indicator is good, and is similar to oil property, can re-injection to primary tower or delayed coking unit, reduce the crude oil waste.
Only for the preferred embodiment of invention, be not to limit practical range of the present invention in sum.Be that all equivalences of doing according to the content of the present patent application claim change and modification, all should be technology category of the present invention.
Claims (9)
1. the treatment process of water oil removing and sump oil decrement is cut in an electric desalting, the method comprises: step 1: the light oil that the electric desalting of crude oil with poor quality is cut water and accounted for its volume fraction 0.5%～5% enters respectively the Centrifugical extraction separating device to be mixed and centrifugation, and the density of described light oil is 750kg/m
3~ 850kg/m
3; Step 2: the water of separating directly enters oil trap, and the oil phase of separating promotes by pump and enters primary tower or delayed coking unit.
2. treatment process as claimed in claim 1 is characterized in that, the described light oil that enters the Centrifugical extraction separating device is gasoline, diesel oil, kerosene or its mixture.
3. treatment process as claimed in claim 1 is characterized in that, the described light oil that enters the Centrifugical extraction separating device and electric desalting are cut water and mixed in the Centrifugical extraction separating device, do not need other mixing facility.
4. method as claimed in claim 1 is characterized in that the temperature that water is cut in the described electric desalting that enters the Centrifugical extraction separating device is 40～90 ℃.
5. treatment process as claimed in claim 1 is characterized in that: cut the water oil concentration in 550ppm～20% volume percent.
6. treatment process as claimed in claim 1, it is characterized in that: injection flow is 0.5%～5% volume percent that the water total flux is cut in electric desalting.
7. device of using for the treatment of process as claimed in claim 1 is characterized in that this device comprises:
One is used for electric desalting cuts the Centrifugical extraction separating device (6) of water oil removing, comprises light phase entrance, heavy liquid inlet, light phase export, heavy out;
One is used for storing the surge tank (7) of sump oil, comprises an input aperture and delivery port;
One pump for delivery of sump oil (8) comprises an input aperture and delivery port;
Wherein, the light phase export of Centrifugical extraction separating device (6) is connected with the input aperture of surge tank (7), and the input aperture of the delivery port of surge tank (7) and pump (8) is connected.
8. device as claimed in claim 7 is characterized in that, the rotating cylinder rotating speed of described Centrifugical extraction separating device (6) is 500～3000rpm.
9. device as claimed in claim 7 is characterized in that: the equipment of described Centrifugical extraction separating device (6) for relying on centrifugal force to separate is Centrifugical extraction separator or liquid-liquid separation whizzer.
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| CN106800944A (en) * | 2017-02-24 | 2017-06-06 | 南京元道环保科技有限公司 | A kind of crude oil is centrifuged desalting and dewatering method and its equipment |
| CN108275750A (en) * | 2017-12-27 | 2018-07-13 | 北方华锦化学工业股份有限公司 | A method of it improving Electric Desalting Wastewater and discharges qualification rate |
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Application publication date: 20130403 |