CN102424444A - Method and device for removing oil from desalted water of crude oil electric desalting device - Google Patents
Method and device for removing oil from desalted water of crude oil electric desalting device Download PDFInfo
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- CN102424444A CN102424444A CN2011103264366A CN201110326436A CN102424444A CN 102424444 A CN102424444 A CN 102424444A CN 2011103264366 A CN2011103264366 A CN 2011103264366A CN 201110326436 A CN201110326436 A CN 201110326436A CN 102424444 A CN102424444 A CN 102424444A
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- salted water
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- separating device
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- 239000003921 oil Substances 0.000 title claims abstract description 91
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 239000010779 crude oil Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000011033 desalting Methods 0.000 title claims abstract description 17
- 238000000605 extraction Methods 0.000 claims abstract description 44
- 239000010865 sewage Substances 0.000 claims abstract description 41
- 150000003839 salts Chemical class 0.000 claims abstract description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 14
- 239000011780 sodium chloride Substances 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 8
- 238000011143 downstream manufacturing Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 4
- 238000006477 desulfuration reaction Methods 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 9
- 238000000926 separation method Methods 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 3
- 235000019198 oils Nutrition 0.000 description 66
- 238000007670 refining Methods 0.000 description 10
- 238000012545 processing Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000005484 gravity Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000004566 IR spectroscopy Methods 0.000 description 3
- 241001465754 Metazoa Species 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000003209 petroleum derivative Substances 0.000 description 3
- 235000013311 vegetables Nutrition 0.000 description 3
- 238000004945 emulsification Methods 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000007764 o/w emulsion Substances 0.000 description 1
- 235000019476 oil-water mixture Nutrition 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Abstract
The invention relates to a method for removing oil from desalted water of a crude oil electric desalting device and a device thereof, wherein desalted water after heat exchange discharged from a crude oil electric desalting tank is separated into an oil phase and salt-containing sewage by using centrifugal extraction separation equipment; the oil phase returns to the crude oil electric desalting device for reuse, and the salt-containing sewage is pressurized by a pump and sent to a downstream device. The device can reduce the oil content of the desalted water from tens of thousands or even hundreds of thousands of ppm to below 300ppm, and simultaneously can control the water content of the recovered oil phase within 0.5 percent (V/V), thereby not only ensuring the effluent sewage to reach the standard, but also realizing the recovery and utilization of crude oil. The method and the device have the advantages of good oil removing effect, low water content of the recovered crude oil, strong applicability, wide operation range, compact equipment structure, low operation cost and the like.
Description
Technical field
The invention belongs to technical field of sewage, relate to a kind of method of utilizing the Centrifugical extraction separating device to remove oil in the crude electric desalter de-salted water.The invention still further relates to the used device of this method.
Background technology
Salt content in crud oil all causes very big harm to crude oil accumulating, processing, quality product and equipment etc.Therefore crude oil must carry out desalination earlier before refining.On the one hand, along with the quilt of tertiary oil recovery technology is used gradually, mostly extraction liquid is the complicated milk sap that water external emulsion or oil-in-water and water-in-oil alternately occur.A large amount of addings of annotating polymers, chemical assistant make the Desalting and Dewatering from Crude Oil difficulty increase greatly in the oil recovery process; On the other hand, the improving constantly of domestic crude runs, the refining ratio of mixing of import high-sulphur heavy crude constantly increases, and has further aggravated the trend of domestic oil refining enterprises crude oil heaviness, poor qualityization.
The heaviness of crude oil and poor qualityization be emulsification problem particularly, causes electric desalting-water distilling apparatus operation easier increasing, and especially electric desalting draining band oil problem is more outstanding.Electric desalting draining band oil problem has become domestic oil refining enterprises a great problem anxious to be solved, and the electric desalting apparatus de-salted water has become one of main source of oil refining enterprise sewage, sump oil.In recent years; Domestic nearly all oil refining enterprise the electric desalting apparatus de-salted water all occurred and seriously has been with oily problem; The direct result of being brought is exactly to have increased heavy sump oil amount of refinery and sewage sump oil intractability greatly; The sump oil freshening causes the oil refining apparatus operation unstable, and corresponding environmental issue also shows especially day by day.
At present, old technology is still generally adopted in the domestic oil refining enterprises WWT.The electric desalting apparatus de-salted water gets into after the sewage work sewage with other device; Through technical finesses such as sedimentation, oil removal, flotation, biochemistry; Isolated sump oil is directly sent into slop oil tank, through delivering to coker after the dehydration or injecting the raw oil pipeline and carry out freshening; Saline sewage then gets into follow up device and further handles.This plant area area is big, and economic benefit is relatively poor, and processing power is limited, a little less than the impact resistance.When coming water to contain Chuck Steak, will cause very big impact to device, also can pose a big pressure to the tank field storage.In addition, this technology oil-water separation is poor, is difficult to the electric desalting apparatus de-salted water is effectively separated.Along with heavy, crude oil with poor quality are mixed the refining ratio and are improved constantly, the aggravation of oily(waste)water emulsification degree, this device can not satisfy the cleaner production requirement.
Summary of the invention
The present invention utilizes the Centrifugical extraction separating device that the crude electric desalter de-salted water is carried out oily water separation, reclaims crude oil, reduces oil content of wastewater, alleviates the pressure of sewage work, has solved the problem that prior art exists.
Technical thought of the present invention is: the old technology that oil refining enterprise generally adopts; I.e. " sedimentation, oil removal-flotation-biochemistry ", advantage is that cost is lower, shortcoming is that floor space is big; Oil-water separation is poor; Disengaging time is long, a little less than the impact resistance, can not effectively remove dissolving oil, oil in water emulsion and dispersed oil in the sewage.Along with the continuous increase of oleaginousness in the de-salted water, this device can not satisfy the cleaner production requirement.It is the novel extraction stripping technique that developed recently gets up that Centrifugical extraction separates; Have characteristics such as floor space is little, processing power big, running is steady, cost is low, clean and maintenance is convenient; Because cf-can reach the hundred times of gravity usually; So Centrifugical extraction separating device separating power is strong, be particularly suitable for handling that two phase density differences are little, viscosity is big and easy emulsive system, as phase-splitting requires two phase density differences greater than 0.1g/cm3 for gravity; And for the Centrifugical extraction separating device, two phase density differences can be as small as 0.01g/cm3.The system less to difference in specific gravity or viscosity is big, the Centrifugical extraction separating device is easy to separate, and disengaging time is short, good separating effect.Adopt the Centrifugical extraction separating device that the crude electric desalter de-salted water is carried out oily water separation, fully take into account advantages such as Centrifugical extraction separating device operating restraint is wide, treatment capacity is big, efficient is high, effective.This equipment can replace degreasing techniques such as gravity settling of the prior art, oil trap.
Solution provided by the invention is specific as follows:
The method of a kind of crude electric desalter de-salted water oil removing, the de-salted water that the electrical oil dewatering salt cellar is discharged is through the interchanger cooling; De-salted water after the cooling gets into the Centrifugical extraction separating device, and de-salted water is separated into oil phase and saline sewage; Oil phase enters the oil phase snubber assembly from the light phase export of Centrifugical extraction separating device, sends into electric desalting apparatus by crude oil pump at last and utilizes; Saline sewage enters the sewage snubber assembly from heavy out, again through delivering to the downstream processing device after supercharging, the heat exchange cooling.
Above-mentioned Centrifugical extraction separating device is to carry out isolating equipment through cf-, is the known usual means in present technique field.The constructional feature of Centrifugical extraction separating device and principle can be consulted Chinese patent ZL 96250989.2, ZL 200720103434.X etc., but not as limit.With ZL200720103434.X is example, and this Centrifugical extraction separating device comprises loam cake, extractor shell, rotary drum and motor: described loam cake is embedded to be covered on the extractor shell; Described rotary drum is installed in the center of extractor shell, and the anti-mouth of extractor shell is on rotary drum, and rotary drum is through rotating shaft and motor linkage; Be provided with heavy phase collecting ring and light collecting ring mutually between described extractor shell and the rotor cover; Extractor shell between the loam cake of heavy phase collecting ring and extractor shell is provided with heavy out; Extraction shell between heavy phase collecting ring and the light phase collecting ring is provided with light phase export, and the extractor shell between light phase collecting ring and the extractor outer casing bottom is provided with import.
This method specifically comprises; The de-salted water that electrical oil dewatering salt cellar 10 is discharged drops to 50～100 ℃ through the heat exchange temperature; De-salted water after the cooling gets into Centrifugical extraction separating device 6, and de-salted water is separated into oil phase and saline sewage; Oil phase enters oil phase snubber assembly 2 from the light phase export of Centrifugical extraction separating device 6, sends into electric desalting apparatus by crude oil pump 7 at last and utilizes; Saline sewage enters sewage snubber assembly 3 from heavy out, again through delivering to the downstream processing device after supercharging, the heat exchange cooling.
Further, the temperature of the de-salted water of above-mentioned entering Centrifugical extraction separating device is 50～100 ℃.
Further, the oil concentration of the de-salted water of above-mentioned entering Centrifugical extraction separating device is 0.02%～80% (V/V).
Above-mentioned Centrifugical extraction separating device working speed does not have particular determination in principle, can regulate through frequency transformer, and the common slip-stick artist of this technical field can make the selection that suits the requirements flexibly according to actual production.
The present invention also provides a kind of device of realizing aforesaid method, comprising:
The interchanger 1 that is used for de-salted water and the heat exchange of desulfurization water comprises de-salted water inlet and de-salted water outlet;
The Centrifugical extraction separating device 6 that is used for the de-salted water oil removing, this Centrifugical extraction separating device 6 are provided with an inlet, a light phase export and a heavy out, and its inlet is connected with the de-salted water outlet of aforementioned interchanger;
Be used for oil phase buffered oil phase snubber assembly 2, comprise oil phase inlet and oil phase outlet, its oil phase inlet is connected with the light phase export of aforementioned Centrifugical extraction separating device 6;
Be used for saline sewage buffered sewage snubber assembly 3, comprise a sewage inlet and a sewage outlet, its sewage inlet is connected with the heavy out of Centrifugical extraction separating device 6.
The present invention also provides a kind of a kind of crude electric desalter that uses aforesaid oil removal plant of device of realizing aforesaid method; Comprise the crude oil pump 7 that contains a former oil-in and crude exports; Contain a former oil-in, and take off the electrical desalter 10 of back crude exports and de-salted water outlet; The crude exports of crude oil pump 7 are connected with the former oil-in of electrical desalter 10, it is characterized in that, the oil phase outlet of said oil phase snubber assembly 2 is connected with the former oil-in of crude oil pump 7.
Further, 10 of said crude oil pump 7 and electrical desalters also are in series with in order to preheater 8 and mixing tank 9 with heating crude oil.
Further, the same e Foerderanlage 4 of the sewage outlet of said sewage snubber assembly 3 is communicated with so that be delivered to the downstream processing device.
Compared with prior art, the invention has the advantages that:
(a) adopt the Centrifugical extraction separating device to separate the oil in the crude electric desalter de-salted water, good separating effect, velocity of separation is fast, has overcome the problems of the prior art.
(b) realized the oil removing on the spot of electric desalting apparatus de-salted water and the recycling of crude oil, production equipment is simple in structure, and operating restraint is wide, strong shock resistance, and suitability is strong, is adapted at petroleum chemical industry and applies.
Description of drawings
Fig. 1 is the device schema of preferred embodiment of the present invention, wherein:
1-interchanger 2-oil phase surge tank 3-sewage surge tank 4-water pump 5-interchanger 6-Centrifugical extraction separating machine 7-crude oil pump 8-preheater 9-mixing tank 10-electrical desalter
Embodiment
Below in conjunction with specific examples, further illustrate content of the present invention.
As shown in Figure 1, annotated the crude oil of emulsion splitter and delivered to preheater (8) by crude oil pump (7), inject desulfurization water midway; Oil-water mixture is heated to 110～140 ℃ at preheater (8), gets into mixing tank (9) thorough mixing afterwards; Final mixture gets into electrical desalter (10) and carries out electric desalting, forms to take off back crude oil and de-salted water; Take off back crude oil and discharge the entering downstream unit by the back crude exports of taking off on electrical desalter (10) top, de-salted water is discharged from the de-salted water outlet of electrical desalter (10) bottom; The de-salted water that electrical desalter (10) is discharged cools to 50～100 ℃ through interchanger (1); Get into Centrifugical extraction separating machine (6) subsequently, de-salted water is separated into oil phase and saline sewage; Oil phase enters oil phase surge tank (2) from the light phase export of Centrifugical extraction separating machine (6), sends into electric desalting apparatus by crude oil pump (7) at last and utilizes; Saline sewage enters sewage surge tank (3) from heavy out, through delivering to the downstream processing device after pump (4) supercharging, interchanger (5) cooling.
Should be understood that these embodiment only to be used to the present invention is described and be not used in the restriction scope of the present 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.Only if indicate, otherwise all umbers are mass fraction that all per-cent is mass percent.
Embodiment 1
Carry out the oil removing of crude electric desalter de-salted water by aforesaid technical process, specific as follows:
1. material properties
De-salted water: flow is 5t/h, and temperature is 75 ℃, oil-contg 20000ppm.
2. Centrifugical extraction separator drum diameter is 300mm, and motor speed is 1800r/min.
3. content assaying method
The oil water cut is measured according to GB/T260-77 petroleum products aquametry.
The water oleaginousness is measured according to the mensuration infrared spectrophotometry of GB/T16488-1996 water quality petroleum-type and vegetable and animals oils.
4. effect
After through the Centrifugical extraction separator for processing, heavy out saline sewage oleaginousness is 200ppm, and oil removal efficiency has reached 99%, and light phase export oil phase water cut has reached good oil-water sepn effect less than 0.5% (V/V).
Embodiment 2
Carry out the oil removing of crude electric desalter de-salted water by aforesaid technical process, specific as follows:
1. material properties
De-salted water: flow is 2t/h, and temperature is 75 ℃, oil-contg 20000ppm.
2. Centrifugical extraction separator drum diameter is 300mm, and motor speed is 1800r/min.
3. content assaying method
The oil water cut is measured according to GB/T260-77 petroleum products aquametry.
The water oleaginousness is measured according to the mensuration infrared spectrophotometry of GB/T16488-1996 water quality petroleum-type and vegetable and animals oils.
4. effect
After through the Centrifugical extraction separator for processing, heavy out saline sewage oleaginousness is 150ppm, and oil removal efficiency has reached 99.25%, and light phase export oil phase water cut has reached good oil-water sepn effect less than 0.5% (V/V).
Carry out the oil removing of crude electric desalter de-salted water by aforesaid technical process, specific as follows:
1. material properties
De-salted water: flow is 2t/h, and temperature is 75 ℃, oil-contg 12000ppm.
2. Centrifugical extraction separator drum diameter is 300mm, and motor speed is 1800r/min.
3. content assaying method
The oil water cut is measured according to GB/T260-77 petroleum products aquametry.
The water oleaginousness is measured according to the mensuration infrared spectrophotometry of GB/T16488-1996 water quality petroleum-type and vegetable and animals oils.
4. effect
After through the Centrifugical extraction separator for processing, heavy out saline sewage oleaginousness is 120ppm, and oil removal efficiency has reached 99%, and light phase export oil phase water cut has reached good oil-water sepn effect less than 0.5% (V/V).
Being merely the preferred embodiment of invention in sum, is not to be used for limiting practical range of the present invention.Be that all equivalences of doing according to the content of claim of the present invention change and modification, all should be technological category of the present invention.
Claims (8)
1. the method for crude electric desalter de-salted water oil removing is characterized in that, the de-salted water that electrical oil dewatering salt cellar (10) is discharged drops to 50～100 ℃ through the heat exchange temperature; De-salted water after the cooling gets into Centrifugical extraction separating device (6), and de-salted water is separated into oil phase and saline sewage; Oil phase enters oil phase snubber assembly (2) from the light phase export of Centrifugical extraction separating device (6), sends into electric desalting apparatus by crude oil pump (7) at last and utilizes; Saline sewage enters sewage snubber assembly (3) from heavy out, again through delivering to the downstream processing device after supercharging, the heat exchange cooling.
2. method according to claim 1 is characterized in that the temperature of the de-salted water of said entering Centrifugical extraction separating device is 50～100 ℃.
3. method according to claim 1 is characterized in that the oil concentration of the de-salted water of said entering Centrifugical extraction separating device is 0.02%～80%, and said per-cent is volume percent.
4. method according to claim 1 is characterized in that the separating factor of equipment is 100～500 in the said sepn process.
5. realize the crude electric desalter de-salted water oil removal plant of method according to claim 1 for one kind, it is characterized in that, comprising:
The interchanger (1) that is used for de-salted water and the heat exchange of desulfurization water comprises de-salted water inlet and de-salted water outlet;
The Centrifugical extraction separating device (6) that is used for the de-salted water oil removing, this Centrifugical extraction separating device (6) are provided with an inlet, a light phase export and a heavy out, and its inlet is connected with the de-salted water outlet of aforementioned interchanger;
Be used for oil phase buffered oil phase snubber assembly (2), comprise oil phase inlet and oil phase outlet, its oil phase inlet is connected with the light phase export of aforementioned Centrifugical extraction separating device (6);
Be used for saline sewage buffered sewage snubber assembly (3), comprise a sewage inlet and a sewage outlet, its sewage inlet is connected with the heavy out of Centrifugical extraction separating device (6).
6. crude electric desalter that uses oil removal plant as claimed in claim 5; Comprise the crude oil pump (7) that contains a former oil-in and crude exports; Contain a former oil-in, and take off the electrical desalter (10) of back crude exports and de-salted water outlet; The former oil-in of the same electrical desalter of crude exports (10) of crude oil pump (7) is connected, and it is characterized in that, the former oil-in that the oil phase of said oil phase snubber assembly (2) exports same crude oil pump (7) is connected.
7. like the said device of claim 6, it is characterized in that, also be in series with between said crude oil pump (7) and electrical desalter (10) in order to preheater (8) and mixing tank (9) with heating crude oil.
8. like the said device of claim 6, it is characterized in that the same e Foerderanlage of sewage outlet (4) of said sewage snubber assembly (3) is communicated with so that be delivered to the downstream processing device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110326436 CN102424444B (en) | 2011-10-25 | 2011-10-25 | Method and device for removing oil from desalted water of crude electrostatic desalting apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110326436 CN102424444B (en) | 2011-10-25 | 2011-10-25 | Method and device for removing oil from desalted water of crude electrostatic desalting apparatus |
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| CN102424444B CN102424444B (en) | 2013-06-12 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102757813A (en) * | 2012-07-24 | 2012-10-31 | 华东理工大学 | Crude oil processing unit containing electro-desalted sewage oil remover and method of crude oil processing unit |
| CN102847343A (en) * | 2012-08-28 | 2013-01-02 | 华东理工大学 | Heavy polluted oil processing device and method thereof |
| CN103011325A (en) * | 2012-12-12 | 2013-04-03 | 华东理工大学 | Treating method and device for oil removal of electro-desalting cut water of inferior crude oil and decrement of dirty oil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102757813A (en) * | 2012-07-24 | 2012-10-31 | 华东理工大学 | Crude oil processing unit containing electro-desalted sewage oil remover and method of crude oil processing unit |
| CN102847343A (en) * | 2012-08-28 | 2013-01-02 | 华东理工大学 | Heavy polluted oil processing device and method thereof |
| CN103011325A (en) * | 2012-12-12 | 2013-04-03 | 华东理工大学 | Treating method and device for oil removal of electro-desalting cut water of inferior crude oil and decrement of dirty oil |
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| CN102424444B (en) | 2013-06-12 |
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