CN110878219B - High-water-content crude oil electric dehydration device - Google Patents
High-water-content crude oil electric dehydration device Download PDFInfo
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- CN110878219B CN110878219B CN201911193346.7A CN201911193346A CN110878219B CN 110878219 B CN110878219 B CN 110878219B CN 201911193346 A CN201911193346 A CN 201911193346A CN 110878219 B CN110878219 B CN 110878219B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G33/00—Dewatering or demulsification of hydrocarbon oils
- C10G33/02—Dewatering or demulsification of hydrocarbon oils with electrical or magnetic means
Abstract
The invention discloses an electric dehydration device for crude oil with high water content, which comprises a shell, wherein a filling area is arranged in the shell and close to the inlet side of the crude oil, a grid is arranged between the filling area and an oil outlet, the grid is fixed on the inner bottom surface of the shell, electrodes are arranged in intervals of the grid, the electrodes are arranged in a hanging manner through an electrode frame, an electric dehydration electric field is formed between the electrodes and the grid, the electrode frame is fixed at the top in the shell, one end of the grid, close to the filling area, is connected with a power supply grounding end, and the electrodes are connected with a power supply positive electrode through the electrode frame. The electric dehydration area of the invention adopts a mode of partition of the partition plates to divide the electric dehydration device into a plurality of parts, and an uneven electric field is formed by the reducing electrodes between the partition plates, so that the strength of the electric field in the electric dehydration device is matched with the water content, thereby improving the electric dehydration efficiency of the crude oil containing water.
Description
Technical Field
The invention belongs to the technical field of crude oil electric dehydration, and particularly relates to a high-water-content crude oil electric dehydration device.
Background
The crude oil electric dehydration technology is a technology for removing water in water-containing crude oil, and has the advantages of high efficiency, large treatment capacity and the like, so that the crude oil electric dehydration technology is widely applied. The technical principle of electric dehydration is as follows: under the action of an electric field, water drops in the crude oil containing water are polarized due to the difference of the electric conductivity of oil and water phases, dipole coalescence force enabling the water drops to attract each other is generated among the polarized water drops, the polarized water drops are stretched and deformed by the electric field force, the strength of a boundary film between the water drops is weakened by the deformation of the water drops, so that the coalescence of the water drops is promoted, the particle size of the water drops is increased after the coalescence, and the water drops are settled and separated under the action of gravity.
The process of coalescence of the water droplets can be divided into two stages: firstly, water drops which are far away from each other are close to each other, the Brownian motion and the flow field play a promoting role in the stage, and the role of the electric field can be ignored; and secondly, the water drops with close intervals break through the interface film formed by the continuous phase to finish coalescence, the water drop intervals are small, the dipole coalescence force among the polarized water drops is large, and meanwhile, the deformation of the water drops can promote the interface film to be broken, so that the electric field mainly plays a main role in the stage. The promotion of either of the two stages effectively increases the rate of coalescence of water droplets, thereby improving dewatering efficiency and throughput. Most of the traditional electric dehydrator designs and related researches are focused on crude oil with low water content, and the use effect of the crude oil with the water content of more than 30 percent is generally poor. However, as the nature of the produced crude oil becomes worse and the development of the offshore oil field is advanced, the demand for the electric dehydrator with better effect and smaller equipment volume for processing the crude oil with high water content is increasing, more and more students concentrate on the electric dehydration of the crude oil with high water content at home and abroad, but the design of the electric dehydrator with high water content is rare by applying the relevant principle.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the high-efficiency electric dehydrator which can effectively improve the electric dehydration efficiency of the crude oil with high water content so as to effectively treat the crude oil with high water content.
The invention is realized by the following technical scheme:
the utility model provides a high moisture crude oil electric dehydration device, electric dehydration device include the casing, the casing in be close to crude oil inlet side and be provided with the filler district, filler district and oil-out between arrange by the grid, the grid fix on the casing bottom surface, be provided with the electrode in the interval of grid, the electrode pass through the electrode frame and hang the setting, and form the electric dehydration electric field between the grid, the electrode frame fix the top in the casing, the grid is close to the one end in filler district and is connected with the power earthing terminal, the electrode pass through the electrode frame and be connected with the positive pole of power.
The filler area is composed of a honeycomb-shaped clamping plate and filler and is welded at the crude oil inlet end of the shell, and the inner diameter of the corresponding position of the filler area and the shell is matched.
The grounding end and the positive electrode are connected with the grating and the electrode frame through leads, and the lead sleeve is provided with an insulating sleeve for insulation, so that the high-voltage breakdown of a conducting wire is prevented, and the short circuit of the device is avoided.
The electrodes comprise a reducing cylindrical electrode and a reducing rectangular pyramid electrode, the reducing cylindrical electrode is arranged in the grid interval, and the reducing rectangular pyramid electrode is arranged between the side wall of the electric tripping device and the nearest grid. The electrode is obtained by processing a conductive metal rod, a polytetrafluoroethylene coating is added on the outer surface of the electrode in a film wrapping mode to realize the insulation treatment of the electrode, the electrode is vertically suspended and installed inside the casing of the electric tripping device, and one end of the electrode is communicated with the positive electrode of a power supply.
The length of the cylindrical electrode with different diameters is different according to different positions, and the electrode close to the middle area is longer. The reducing cylindrical electrode is in a circular truncated cone shape, and the diameter of the top section is larger than that of the bottom section. The reducing cylindrical electrode can adapt to the condition that the water content of the upper layer of high-water-content crude oil in the electric dehydration device is lower, and an electric field can be properly increased; the lower layer has higher water content and the electric field is easy to break down. The same voltage parameter is used to effect the change in the electric field parameter.
The surface of the reducing rectangular pyramid electrode close to the grating is uniformly close to the center of the cross section along a certain slope, the surface close to the shell is vertically close to the center of the cross section along a certain slope in the upper half area and the lower half area of the tank, and is finally intersected with other surfaces.
The grid is formed by mutually perpendicular partition plates, the partition plates are net partition plates and are fixed with the shell in a welding mode, and the net partition plates can reserve fluid flow channels and ensure mutual circulation among all areas.
And the outer surface of the filler area, the surface of the grating and the inner surface of the shell are coated with a layer of insulating hydrophobic layer. The insulating hydrophobic material is coated, so that the occurrence of electric field collapse can be prevented, water drops are prevented from being attached to the electrode, once the water drops are attached to the electrode, the potential difference is concentrated on the insulating layer, and the electric field established on the emulsion is weakened.
The upper side space of the electrode frame in the shell of the electric dehydration device does not form an electric field, and no crude oil flows through the electric dehydration device, so that the electric dehydration device is used for balancing the flow of the crude oil inlet and outlet and the pressure in the tank.
The invention has the beneficial effects that:
the structure of the traditional electric threshing device is changed, the internal space of the container is uniformly divided into a plurality of regular spaces by adopting a grid mode, and a reducing cylindrical electrode is arranged in each space; meanwhile, the improved quadrangular pyramid electrode is arranged in an irregular space adjacent to the tank wall on the oil outlet side. The high-water-content crude oil passes through the filler area in the electric dehydration device, the filler in the filler area can reduce the water content of the crude oil and reduce the impact of pumping the crude oil, the high-water-content crude oil enters a high-frequency electric field area after passing through the filler area, and lower-layer water drops can naturally settle according to the characteristics of the high-water-content crude oil, so that the electric field environment has the characteristic of 'strong top and weak bottom', the electric field can effectively improve the electric dehydration efficiency of the high-water-content crude oil, and the effective electric dehydration treatment of the high-water-content crude oil is realized.
Drawings
FIG. 1 is a schematic view of the construction of an electric dehydration apparatus of the present invention;
FIG. 2 is a schematic side view of an electric dehydration engine of the present invention;
FIG. 3 is a schematic structural diagram of a cylindrical electrode of different diameter according to the present invention;
FIG. 4 is a schematic structural diagram of the reduced diameter rectangular pyramid electrode of the present invention;
in the figure: 1. the electrode comprises a shell, 2, a filling area, 3, a grounding end, 4, an insulating sleeve, 5, an anode, 6, an electrode, 61, a reducing cylindrical electrode, 62, a reducing rectangular pyramid electrode, 7, a grid, 8 and an electrode frame.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figure 1, the high water content crude oil electric dehydration device comprises a shell 1, a filler area 2, a partition plate 7 and an electrode 6. The filler area 2 is arranged at the crude oil inlet end of the casing 1 of the electric dehydration device, the filler area 2 is formed by a honeycomb-shaped clamping plate and filler and is welded at the crude oil inlet end of the casing 1, and the inner diameter of the corresponding part of the filler area 2 and the casing 1 is matched. The filler zone 2 can buffer the impulsive force of the pumped crude oil, filter out impurities possibly appearing in the oil product, reduce the water content of the crude oil and the like. A grating 7 is arranged between the filling area 2 and the oil outlet, and the grating 7 is fixed on the inner bottom surface of the shell 1. The grid 7 is made of conductive metal plates, is uniformly arranged in the transverse direction and the longitudinal direction, is arranged in the shell 1, and divides the tank body into a plurality of areas. The grating 7 is formed by mutually perpendicular partition plates which are net-shaped partition plates and fixed with the shell 1 in a welding mode, and the grating 7 can reserve a fluid flow passage to ensure the mutual circulation among all areas. Electrodes 6 are arranged among the grids 7, the electrodes 6 are also arranged between the side wall of the electric dehydration device and the nearest grid 7, the electrodes 6 are arranged in a hanging mode through electrode frames 8, an electric dehydration electric field is formed between the electrodes 6 and the partition plates, the electrode frames 8 are fixed on the top in the shell 1, one end, close to the filling area 2, of each grid 7 is connected with a power supply grounding end 3, and the electrodes 6 are connected with a power supply positive electrode 5 through the electrode frames 8. The grounding end 3 and the anode 5 are connected with the grid 7 and the electrode frame 8 through leads, and the lead sleeves are provided with insulating sleeves 4 for insulation, so that high-voltage breakdown of the conducting wires is prevented, and short circuit of the device is caused.
The electrode 6 includes a cylindrical electrode 61 and a rectangular pyramid electrode 62. The reducing cylindrical electrode 61 is arranged within the interval of the grid 7, and the reducing rectangular pyramid electrode 62 is arranged between the side wall of the electrodeionization device and the grid 7 nearest to the side wall. The electrode 6 is obtained by processing a conductive metal rod, a polytetrafluoroethylene coating is added on the outer surface of the electrode 6 in a film wrapping mode to realize the insulation treatment of the electrode 6, the electrode is vertically suspended and installed inside the casing 1 of the electric tripping device, and one end of the electrode is communicated with the positive electrode 5 of the power supply.
As shown in fig. 2, when viewed from the side of the electrodeionization device, the electrodes 6 are unevenly distributed, and the electrodes 6 near the middle region of the device are longer and gradually decrease toward both sides. The electrodes 6 distributed centrally between the grids 7 are cylindrical electrodes 61 of different diameter. The electrode 6 between the two side walls of the device and the partition is a rectangular pyramid electrode 62 with different diameter.
As shown in fig. 3, the different-diameter cylindrical electrodes 61 have different lengths depending on the positions, and the electrode 6 near the middle region is longer. The reducing cylindrical electrode 61 is in a circular truncated cone shape, and the diameter of the top section is larger than that of the bottom section. The reducing cylindrical electrode 61 can adapt to the condition that the water content of the upper layer of high-water-content crude oil in the electric dehydration device is low, and the electric field can be properly increased; the lower layer has high water content and the electric field is easy to break down. The same voltage parameter is used to effect the change in the electric field parameter.
As shown in fig. 4, the surface of the different-diameter rectangular pyramid electrode 62 close to the grid 7 is close to the center of the cross section along a certain slope, the surface close to the shell 1 is close to the center of the cross section along a certain slope in the upper half area and the lower half area of the tank vertically downward, and finally intersects with other surfaces.
The grating 7 is formed by mutually perpendicular partition plates which are net partition plates and fixed with the shell 1 in a welding mode, and the grating 7 can reserve a fluid flow passage to ensure the mutual flow among all areas. The upper space of the electrode frame 8 in the electric dehydration device shell 1 does not form an electric field, and no crude oil flows through the electric dehydration device shell, and the electric dehydration device shell is used for balancing the flow of the crude oil inlet and outlet and balancing the pressure in the tank.
The working principle of the device is as follows: after the crude oil with high water content to be treated enters the electric dehydration device, the crude oil which is buffered, absorbed and filtered by the filler zone 2 enters the device, and the liquid level of the electric dehydration device reaches a certain height. The electrode 6 and the electric dehydration device shell, the grid 7 form an uneven electric field area, the dielectrophoresis force generated by the uneven electric field with different upper and lower strength makes the water drop move to the periphery of the flow channel, the dielectrophoresis speeds of the water drops with different particle sizes are different, thereby promoting the water drop collision and coalescence, meanwhile, the dielectrophoresis movement can also promote the water drop to contact with the electrode 6 and charge, the diameter of the electrode 6 is of a structure with the diameter increasing from bottom to top, which is favorable for preventing the electric field breakdown phenomenon caused by the too strong electric field at the lower part, the stronger electric field at the upper part is also favorable for the water drop charge, the charged water drops move to the center of the flow channel under the action of the dielectrophoresis force, the particle sizes and the speeds of the water drops with different charge quantities are different, thereby collision and coalescence. In addition, dielectrophoresis and electrophoresis have droplet movement in opposite directions and collisions may occur. The inner surface of the device, the grating 7 and the outer surface of the electrode 6 are coated with the insulating hydrophobic layer, so that electric field collapse caused by the fact that the electrode 6 is conducted by long water chains can be prevented, electric charges are prevented from being attached to the electrode 6, the potential difference is concentrated on the insulating layer, the electric field in emulsion is weakened, water drops move downwards under the action of gravity and enter an electric field area between the electrode 6 and the grating 7 and the device shell 1, coalescence is continued under the action of the electric field, and the charged water drops are accelerated to settle under the action of the electric field force. The electric field with strong top and weak bottom effectively improves the electric dehydration efficiency of the crude oil with high water content, thereby realizing the effective electric dehydration treatment of the crude oil with high water content.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The electric dehydration device for the crude oil with high water content is characterized by comprising a shell (1), wherein a packing area (2) is arranged in the shell (1) and close to a crude oil inlet end, a grid (7) is arranged between the packing area (2) and an oil outlet, the grid (7) is fixed on the inner bottom surface of the shell (1), electrodes (6) are arranged among the intervals of the grid (7), the electrodes (6) are arranged in a hanging mode through an electrode frame (8) and form an electric dehydration electric field with the grid (7), the electrode frame (8) is fixed at the top in the shell (1), one end, close to the packing area (2), of the grid (7) is connected with a power grounding end (3), and the electrodes (6) are connected with a power positive electrode (5) through the electrode frame (8);
the electrodes (6) comprise reducing cylindrical electrodes (61) and reducing rectangular pyramid electrodes (62), the reducing cylindrical electrodes (61) are arranged in intervals of the grids (7), and the reducing rectangular pyramid electrodes (62) are arranged between the side wall of the electric dehydration device and the nearest grids (7); the reducing cylindrical electrode (61) is in a circular truncated cone shape, and the diameter of the top section is larger than that of the bottom section; the surface of the reducing rectangular pyramid electrode (62) close to the grating (7) is uniformly close to the center of the cross section along a certain slope, the surface close to the shell (1) is vertically downward in the upper half area of the tank, is close to the center of the cross section along a certain slope in the lower half area, and finally is intersected with the center point of other surfaces;
the grating (7) is formed by mutually vertical partition plates, and the partition plates are net-shaped and are fixed with the shell (1) in a welding mode.
2. The electric dehydration device for crude oil with high water content according to claim 1, characterized in that said filler region (2) is composed of honeycomb splint and filler, and the inner diameter of the corresponding position of said filler region (2) and said shell (1) is matched.
3. The electric dehydration device for crude oil with high water content according to claim 1, characterized in that the grounding end (3) and the anode (5) are connected with the grid (7) and the electrode frame (8) through leads, and the leads are sleeved with an insulating sleeve (4) for insulation.
4. The electric dehydration device for crude oil with high water content according to claim 1, characterized in that the outer surface of the filler region (2), the surface of the grid (7) and the inner surface of the shell (1) are coated with an insulating hydrophobic layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911193346.7A CN110878219B (en) | 2019-11-28 | 2019-11-28 | High-water-content crude oil electric dehydration device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911193346.7A CN110878219B (en) | 2019-11-28 | 2019-11-28 | High-water-content crude oil electric dehydration device |
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| CN110878219A CN110878219A (en) | 2020-03-13 |
| CN110878219B true CN110878219B (en) | 2021-12-28 |
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| CN113583703A (en) * | 2021-08-20 | 2021-11-02 | 长江三星能源科技股份有限公司 | Three-phase separator with high-voltage electric field |
| CN113773873A (en) * | 2021-09-27 | 2021-12-10 | 中国石油大学(华东) | Crude oil electric dewatering system capable of treating intermediate layer |
| CN114989859A (en) * | 2022-05-05 | 2022-09-02 | 中国石油化工股份有限公司 | Apparatus and method for dewatering crude oil containing water |
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| CN1900228A (en) * | 2006-07-07 | 2007-01-24 | 中国石油化工集团公司 | Electric desalting and dewatering device |
| CN102382674A (en) * | 2010-08-25 | 2012-03-21 | 中国石油化工股份有限公司 | Electrodesalting and electrodehydrating device |
| CN203668316U (en) * | 2014-01-22 | 2014-06-25 | 北京迪威尔石油天然气技术开发有限公司 | Electrostatic coalescence module, device and system |
| CN103920328A (en) * | 2014-04-01 | 2014-07-16 | 中煤张家口煤矿机械有限责任公司 | Magnetic fluid dehydrating manner |
| CN108949223A (en) * | 2018-08-21 | 2018-12-07 | 中国石油大学(华东) | A kind of efficient electric dehydrator |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1900228A (en) * | 2006-07-07 | 2007-01-24 | 中国石油化工集团公司 | Electric desalting and dewatering device |
| CN102382674A (en) * | 2010-08-25 | 2012-03-21 | 中国石油化工股份有限公司 | Electrodesalting and electrodehydrating device |
| CN203668316U (en) * | 2014-01-22 | 2014-06-25 | 北京迪威尔石油天然气技术开发有限公司 | Electrostatic coalescence module, device and system |
| CN103920328A (en) * | 2014-04-01 | 2014-07-16 | 中煤张家口煤矿机械有限责任公司 | Magnetic fluid dehydrating manner |
| CN108949223A (en) * | 2018-08-21 | 2018-12-07 | 中国石油大学(华东) | A kind of efficient electric dehydrator |
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