CN215855929U - Inclined plate type electric desalting and electric dehydrating electric field structure - Google Patents
Inclined plate type electric desalting and electric dehydrating electric field structure Download PDFInfo
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- CN215855929U CN215855929U CN202122350205.0U CN202122350205U CN215855929U CN 215855929 U CN215855929 U CN 215855929U CN 202122350205 U CN202122350205 U CN 202122350205U CN 215855929 U CN215855929 U CN 215855929U
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Abstract
An inclined plate type electric desalting and electric dehydrating electric field structure belongs to the field of electric dehydration of crude oil in oil fields. The inclined plate type electric desalting and dewatering electric field structure comprises an electric desalting and dewatering tank and an alternating current-direct current control electric field system, and is characterized in that an inclined plate type positive electrode plate and an inclined plate type negative electrode plate are arranged in the electric desalting and dewatering tank, the inclined plate type positive electrode plate and the inclined plate type negative electrode plate are oppositely arranged, and plate bodies of the inclined plate type positive electrode plate and the inclined plate type negative electrode plate form a certain included angle with the vertical direction; the surface of the plate is coated with a hydrophilic base coating, so that fine water drops in the crude oil can be combined with the coating on the surface of the plate, the water drops are gathered, and the purpose of deep dehydration is achieved.
Description
Technical Field
The present invention belongs to the field of electric dewatering of crude oil in oil field, electric desalting of crude oil in oil refinery, ship bottom oil, waste oil, coal tar, etc. and is suitable for deep desalting and dewatering of heavy inferior crude oil with high specific weight, high viscosity, high acid value, high water content, high salt content and easy emulsification.
Technical Field
As oil production enters the middle and late stages, crude oil properties become more and more complex. The existing electric desalting technology generally has the problems that the running current is increased and the desalting and dewatering effects are poor when the crude oil is treated.
At present, the electric desalting technology widely applied to oil fields and oil refineries mainly comprises three technologies:
the first is an alternating current desalting technology, an alternating current desalting electric field adopts two layers or three layers of horizontal electrode plates, a lower layer electrode plate is electrified, an upper layer electrode plate is grounded (or a middle electrode plate is electrified, and an upper layer electrode plate and a lower layer electrode plate are grounded), so that the alternating current electric field is formed, the property of the treated oil product is better, and the treatment requirement can be met under the condition that the treatment requirement is not very high. Oil fields currently use more of this technology because their crude oil handling requirements are not very high. If oil products are deteriorated, the demulsification capacity of the electric field is greatly reduced, the water and salt content of the crude oil are increased after the oil products are removed, the running current is increased, even the running current is short-circuited, the power consumption of the electric field is high, and the salt content after the oil products are removed is hardly lower than 5mg/L, so that the current oil refinery basically changes the structure of the electric field into an alternating current and direct current desalting technology.
The second is an alternating current and direct current desalting technology, wherein an alternating current and direct current desalting electric field adopts vertical electrode plates, and positive and negative electrode plates are alternately arranged along the axial direction of an electric desalting tank to form an alternating current weak electric field, a direct current weak electric field and a direct current strong electric field from top to bottom. The emulsion composed of crude oil, water and demulsifier enters into the electric desalting tank from water phase, and after washing of water layer, the emulsion firstly enters into the alternating current weak electric field, most of water in the crude oil is removed in the alternating current weak electric field, so that the conductivity of the crude oil is reduced, short circuit cannot occur due to high conductivity of the crude oil when entering into the direct current electric field, a small amount of water in the crude oil can be removed in the direct current strong electric field, and the energy consumption is reduced while the effect of deep desalting and dewatering is achieved. The technology is widely applied to oil refineries, but when the oil refineries process heavy inferior crude oil which has high specific gravity, high viscosity, high acid value, high water content, high salt content and easy emulsification, the desalting and dehydrating rate of the technology is reduced, the requirements that the salt content is less than 3mg/L and the water content is less than 0.2 percent after dehydration are difficult to achieve, the power consumption is increased, short circuit is caused sometimes, and the treatment effect cannot be achieved.
The third is a high-speed electric desalting technology, which is developed mainly aiming at the large-scale requirements of oil refineries in China, and mainly utilizes a smaller tank body to achieve larger treatment capacity, the high-speed electric desalting field adopts four layers of horizontal electrode plates, crude oil is directly sprayed into the high-voltage field through a nozzle to quickly separate oil from water, and when heavy and poor crude oil which has high specific gravity, high viscosity, high acid value, high water content, high salt content and easy emulsification is treated, the defects of high salt content and water content after dehydration, high electric desalting operating current, oil content in discharged water and the like can also occur.
In addition, several oil refineries in China import several sets of electric desalting equipment from PETREC company in America, and the problems of high salt content and water content after desalting, high electric desalting operation current, even short circuit, oil content in discharged water and the like can also occur when poor crude oil is treated.
The existing technologies for processing heavy inferior crude oil with high specific gravity, high viscosity, high acid value, high water content, high salt content and easy emulsification can not achieve better desalting and dewatering effects, the general operating current is very large, and some even direct short circuits occur. The reason is mainly because the existing methods for electric desalting and electric dewatering completely depend on the action of an electrostatic field, once the electrostatic field has a problem, the dewatering effect does not reach the standard, and even if the electric field has no problem, fine water drops in the crude oil cannot be effectively gathered in an effective electric field interval under the condition that the viscosity and the specific gravity of the crude oil are large.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model provides a sloping plate type electric desalting and dewatering electric field structure, wherein a polar plate of the electric field structure has a certain included angle with the vertical direction, so that the rising direction of crude oil is changed, the contact area of the crude oil and the polar plate is increased, and the retention time of the crude oil in the electric field is prolonged; the surface of the plate is coated with a hydrophilic base coating, so that fine water drops in the crude oil can be combined with the coating on the surface of the plate, the water drops are gathered, and the purpose of deep dehydration is achieved.
Therefore, the utility model adopts the following technical scheme: an inclined plate type electric desalting and electric dehydrating electric field structure comprises an electric desalting and dehydrating tank and an alternating current-direct current control electric field system, and is characterized in that an inclined plate type positive electrode plate and an inclined plate type negative electrode plate are arranged in the electric desalting and dehydrating tank, the inclined plate type positive electrode plate and the inclined plate type negative electrode plate are oppositely arranged, plate bodies of the inclined plate type positive electrode plate and the inclined plate type negative electrode plate form a certain included angle with a vertical direction, the rising direction of crude oil can be changed through the certain included angle, the contact area of the crude oil and the electrode plates is increased, and the retention time of the crude oil in an electric field is prolonged; the surface of the plate is coated with a hydrophilic base coating, so that fine water drops in the crude oil can be combined with the coating on the surface of the plate, the water drops are gathered, and the purpose of deep dehydration is achieved.
In addition to the above technical solutions, the present invention also includes the following technical features.
The inclined plate type electric desalting and electric dehydrating electric field structure further comprises an intelligent servo control electric field system, the intelligent servo control electric field system comprises a single intelligent alternating current voltage regulating module, a PLC control loop, an intelligent servo control transformer and an intelligent servo control horizontal electric field, one set of intelligent servo control transformer and control system is added outside the tank, high voltage is introduced into one layer of horizontal electrode plates added in the tank, and the horizontal intelligent servo high voltage electric field is formed in emulsion.
The surfaces of the inclined plate type positive electrode plate and the inclined plate type negative electrode plate are coated with hydrophilic coatings, so that small water drops which cannot be gathered by an electric field in crude oil can be effectively gathered.
The working principle is as follows: after the oil-water mixture enters the electric field, the polar plate inclines, the oil-water mixture can obliquely move upwards along the direction of the polar plate, the retention time of the oil-water mixture in the polar plate interval can be increased, and more small water drops can be gathered into large water drops to sink to the bottom of the tank. Because the oil-water mixture is up going to one side, the chance that little drop and polar plate contact will greatly increased, because the polar plate surface coating has hydrophilic coating, little drop can adsorb on the polar plate surface, and the little drop that adsorbs on the polar plate surface can slowly become big drop, can sink to the tank bottoms finally. Under the action of AC/DC electric field and the adsorption of inclined plate type polar plate, the water content in crude oil can be reduced to less than 0.1%, and the salt content can be reduced to less than 2 mg/L.
The utility model can achieve the following beneficial effects: 1. according to the utility model, a set of intelligent servo control transformer and a control system are added outside the electric desalting and dewatering tank, so that high-voltage electricity is introduced into a layer of horizontal electrode plate added in the tank, and a horizontal intelligent servo high-voltage electric field is formed in emulsion. The lower layer is an intelligent servo high-voltage electric field, the upper layer is a mixed electric field of an alternating current and direct current high-voltage electric field, and under the action of the mixed electric field, the dehydrated water content of the inferior crude oil can be greatly reduced to reach the technical index of not more than 0.2% and the salt content of less than 3 mg/L.
Drawings
FIG. 1 is a schematic diagram of an electric field of an intelligent servo-controlled electric desalting and dewatering device of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and the described embodiments are illustrative and explanatory of the utility model and are not to be construed as limiting the utility model solely thereto.
As shown in figure 1, the device comprises an electric desalting and dewatering tank 2 and an alternating current-direct current control electric field system, wherein an inclined plate type positive electrode plate 3 and an inclined plate type negative electrode plate 4 are arranged in the electric desalting and dewatering tank, the inclined plate type positive electrode plate and the inclined plate type negative electrode plate are oppositely arranged, plate bodies of the inclined plate type positive electrode plate and the inclined plate type negative electrode plate form a certain included angle with the vertical direction, and the surfaces of the inclined plate type positive electrode plate and the inclined plate type negative electrode plate are coated with hydrophilic coatings, so that small water drops which cannot be gathered by an electric field in crude oil can be effectively gathered. The rising direction of the crude oil can be changed through a certain included angle, the contact area of the crude oil and the polar plate is increased, and the retention time of the crude oil in an electric field is prolonged; the surface of the plate is coated with a hydrophilic base coating, so that fine water drops in the crude oil can be combined with the coating on the surface of the plate, the water drops are gathered, and the purpose of deep dehydration is achieved.
Preferably, the inclined plate type electric desalting and electric dehydrating electric field structure further comprises an intelligent servo control electric field system, wherein the intelligent servo control electric field system comprises a single intelligent alternating current voltage regulating module, a PLC control loop, an intelligent servo control transformer 1 and an intelligent servo control horizontal electric field, and a set of intelligent servo control transformer and control system is added outside the tank to introduce high voltage into a layer of horizontal electrode plates added in the tank so as to form a horizontal intelligent servo high voltage electric field in the emulsion.
The working principle is as follows: after the oil-water mixture enters the electric field, the polar plate inclines, the oil-water mixture can obliquely move upwards along the direction of the polar plate, the retention time of the oil-water mixture in the polar plate interval can be increased, and more small water drops can be gathered into large water drops to sink to the bottom of the tank. Because the oil-water mixture is up going to one side, the chance that little drop and polar plate contact will greatly increased, because the polar plate surface coating has hydrophilic coating, little drop can adsorb on the polar plate surface, and the little drop that adsorbs on the polar plate surface can slowly become big drop, can sink to the tank bottoms finally. Under the action of AC/DC electric field and the adsorption of inclined plate type polar plate, the water content in crude oil can be reduced to less than 0.1%, and the salt content can be reduced to less than 2 mg/L.
Claims (3)
1. The inclined plate type electric desalting and electric dewatering electric field structure comprises an electric desalting and dewatering tank and an alternating current-direct current control electric field system and is characterized in that an inclined plate type positive electrode plate and an inclined plate type negative electrode plate are arranged in the electric desalting and dewatering tank, the inclined plate type positive electrode plate and the inclined plate type negative electrode plate are arranged oppositely, and plate bodies of the inclined plate type positive electrode plate and the inclined plate type negative electrode plate form a certain included angle with the vertical direction.
2. The inclined plate type electric desalting and electric dehydrating electric field structure according to claim 1, wherein: the inclined plate type electric desalting and electric dehydrating electric field structure further comprises an intelligent servo control electric field system, the intelligent servo control electric field system comprises a single intelligent alternating current voltage regulating module, a PLC control loop, an intelligent servo control transformer and an intelligent servo control horizontal electric field, one set of intelligent servo control transformer and control system is added outside the tank, high voltage is introduced into one layer of horizontal electrode plates added in the tank, and the horizontal intelligent servo high voltage electric field is formed in emulsion.
3. The inclined plate type electric desalting and electric dehydrating electric field structure according to claim 1 or 2, wherein: the surfaces of the inclined plate type positive electrode plate and the inclined plate type negative electrode plate are coated with hydrophilic coatings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122350205.0U CN215855929U (en) | 2021-09-27 | 2021-09-27 | Inclined plate type electric desalting and electric dehydrating electric field structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122350205.0U CN215855929U (en) | 2021-09-27 | 2021-09-27 | Inclined plate type electric desalting and electric dehydrating electric field structure |
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| CN215855929U true CN215855929U (en) | 2022-02-18 |
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| CN202122350205.0U Active CN215855929U (en) | 2021-09-27 | 2021-09-27 | Inclined plate type electric desalting and electric dehydrating electric field structure |
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