CN108949223B - High-efficiency electric dehydrator - Google Patents
High-efficiency electric dehydrator Download PDFInfo
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- CN108949223B CN108949223B CN201810955399.7A CN201810955399A CN108949223B CN 108949223 B CN108949223 B CN 108949223B CN 201810955399 A CN201810955399 A CN 201810955399A CN 108949223 B CN108949223 B CN 108949223B
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- electric dehydrator
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- outlet pipe
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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
An efficient electric dehydrator belongs to the technical field of crude oil electric dehydration. The method is characterized in that: the electric dehydrator comprises an electric dehydrator shell (1), and an oil inlet pipe (2), an water outlet pipe (3) and an oil outlet pipe (6) which are arranged in the electric dehydrator shell (1), wherein the oil inlet pipe (2) and the water outlet pipe (3) are arranged at the lower part of the electric dehydrator shell (1), the oil outlet pipe (6) is arranged at the upper part of the electric dehydrator shell (1), and the inlet of the oil inlet pipe (2) extends out of the electric dehydrator shell (1) and is connected with a reciprocating piston pump (9); an electrode and a suspension needle grounding electrode (5) are arranged in the electric dehydrator shell (1), the suspension needle grounding electrode (5) vertically penetrates through a flow channel in the electrode, and one side of the lower part of the electric dehydrator shell (1) is grounded. The invention adopts the structure that the grounding electrode of the suspension needle vertically passes through the flow channel in the electrode, the electrode distance is greatly reduced, so that an electric field with the same strength can be generated by smaller voltage, the coalescence rate of water drops can be effectively improved, the dehydration efficiency is improved, and the treatment capacity is increased.
Description
Technical Field
An efficient electric dehydrator belongs to the technical field of crude oil electric dehydration.
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 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, and therefore the coalescence of the water drops is promoted, the particle size of the water drops is increased after 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 at a large distance 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 also promote the breakage of the interface film, 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. Conventional electric dehydrator designs and related research have mostly focused on promoting the second stage of the coalescence process, such as: the influence of the type and parameters of the electric field on the electro-dehydration is studied. However, as the nature of the produced crude oil is getting worse in the later stage of oil field exploitation, and the development of offshore oil fields, the demand for electric dehydrators with better treatment effect and smaller equipment volume is increasing, more and more students focus their eyes on the first stage of water drop coalescence, and study the influence of the factors on water drop collision, however, in the aspect of electric dehydrator design, the electric dehydrator applying the related principle is rare.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, and the high-efficiency electric dehydrator capable of effectively improving the coalescence rate of water drops, thereby improving the dehydration efficiency and increasing the treatment capacity is provided.
The technical scheme adopted by the invention for solving the technical problems is as follows: an efficient electric dehydrator is characterized in that: the electric dehydrator comprises an electric dehydrator shell, and an oil inlet pipe, an oil outlet pipe and an oil outlet pipe which are arranged in the electric dehydrator shell, wherein the oil inlet pipe and the oil outlet pipe are arranged at the lower part of the electric dehydrator shell, the oil outlet pipe is arranged at the upper part of the electric dehydrator shell, and an inlet of the oil inlet pipe extends out of the electric dehydrator shell and is connected with a reciprocating piston pump; an electrode and a suspension needle grounding electrode are arranged in the electric dehydrator shell, the suspension needle grounding electrode vertically penetrates through a flow channel in the electrode, and one side of the lower part of the electric dehydrator shell is grounded.
The invention changes the structure in the electric dehydrator, adopts the structure that the grounding electrode of the suspension needle vertically passes through the flow channel in the electrode, greatly reduces the electrode distance, and ensures that a smaller voltage can generate an electric field with the same strength; the reciprocating piston pump is mounted on the oil inlet pipe, the oil inlet amount in the oil inlet pipe is periodically changed through periodic pumping of the reciprocating piston pump, in a periodic flow field, the movement of water drops also periodically changes, the movement amplitudes of the water drops with different particle sizes are different due to the difference of drag force and inertia, and the water drops at a certain distance are close to each other. The large water drops formed by coalescence settle under the action of gravity and enter an electric field area formed between the electrode and the grounded water layer, and the electric field in the area can not only continuously promote the coalescence of the water drops, but also accelerate the settlement of charged water drops. The coalescence rate of water drops can be effectively improved, so that the dehydration efficiency is improved, and the treatment capacity is increased.
And the outlet end of the oil outlet pipe and the outlet end of the water outlet pipe are respectively provided with a wave absorber.
The electrode is a reticular honeycomb electrode with a reticular exposed cross section, is made of metal wires by weaving, is arranged inside the shell of the electric dehydrator through an insulating rod, and one end of the electrode is communicated with a power supply.
The surface of the reticular honeycomb electrode is exposed and has a large surface area, so that water drops can be in contact with the electrode, dielectrophoresis force can enable the water drops to move towards the periphery, the contact between the water drops and the electrode is promoted, the water drops can be subjected to charge transfer after being in contact with the electrode, so that charges are generated, the charged water drops move towards the center of a flow channel under the action of an electric field, and the difference of the charge quantity and the particle size of different water drops causes different electrophoresis speeds, so that the collision of the water.
The suspension pin grounding electrode is made of metal and provided with a plurality of suspension pins which are arranged in parallel, and each suspension pin vertically penetrates through a flow channel in the electrode and is positioned in the center of the flow channel.
An uneven electric field is formed between the grounding electrode of the suspension needle and the honeycomb electrode, polarized water drops move to the periphery under the action of dielectrophoresis force in the uneven electric field, and the dielectrophoresis speeds of different water drops are different, so that the water drops collide.
The upper part of the suspension needle grounding electrode is fixed in the electric dehydrator shell through a suspension and is conducted through the suspension.
The surface of the suspension needle grounding electrode is coated with an insulating hydrophobic layer. The surface of the grounding electrode of the suspension needle is coated with a layer of insulating hydrophobic material, so that the occurrence of an electric field collapse can be prevented, charged water drops can be 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 oil inlet pipe and the water outlet pipe are arranged below the liquid level of the grounding water layer at the lower part in the shell of the electric dehydrator.
Compared with the prior art, the invention has the beneficial effects that:
the invention changes the structure in the electric dehydrator, adopts the structure that the grounding electrode of the suspension needle vertically passes through the flow channel in the electrode, greatly reduces the electrode distance, and ensures that a smaller voltage can generate an electric field with the same strength; the reciprocating piston pump is mounted on the oil inlet pipe, the oil inlet amount in the oil inlet pipe is periodically changed through periodic pumping of the reciprocating piston pump, in a periodic flow field, the movement of water drops also periodically changes, the movement amplitudes of the water drops with different particle sizes are different due to the difference of drag force and inertia, and the water drops at a certain distance are close to each other. The large water drops formed by coalescence settle under the action of gravity and enter an electric field area formed between the electrode and the grounded water layer, and the electric field in the area can not only continuously promote the coalescence of the water drops, but also accelerate the settlement of charged water drops. The coalescence rate of water drops can be effectively improved, so that the dehydration efficiency is improved, and the treatment capacity is increased.
Drawings
Fig. 1 is a schematic diagram of a high-efficiency electric dehydrator.
Fig. 2 is a schematic view of a honeycomb electrode structure.
Fig. 3 is a schematic view of the structure of the ground electrode of the suspension pin.
The device comprises an electric dehydrator shell 1, an oil inlet pipe 2, a water outlet pipe 4, a mesh honeycomb electrode 5, a suspension needle grounding electrode 6, an oil outlet pipe 7, a wave absorber I8, a wave absorber II 9, a reciprocating piston pump 10, an insulating hydrophobic layer 11, a grounding water layer 12 and a suspension.
Detailed Description
FIGS. 1 to 3 illustrate preferred embodiments of the present invention, and the present invention will be further described with reference to FIGS. 1 to 3.
Referring to the attached figures 1-3: an efficient electric dehydrator comprises an electric dehydrator shell 1, and an oil inlet pipe 2, an oil outlet pipe 3 and an oil outlet pipe 6 which are arranged in the electric dehydrator shell 1, wherein the oil inlet pipe 2 and the water outlet pipe 3 are arranged at the lower part of the electric dehydrator shell 1, the oil outlet pipe 6 is arranged at the upper part of the electric dehydrator shell 1, and the inlet of the oil inlet pipe 2 extends out of the electric dehydrator shell 1 and is connected with a reciprocating piston pump 9; an electrode and a suspension needle grounding electrode 5 are arranged in the electric dehydrator shell 1, the suspension needle grounding electrode 5 vertically penetrates through a flow channel in the electrode, and one side of the lower part of the electric dehydrator shell 1 is grounded.
The outlet end of the oil outlet pipe 6 and the outlet end of the water outlet pipe 3 are respectively provided with a wave absorber. The oil inlet pipe 2 and the water outlet pipe 3 are arranged below the liquid level of the grounding water layer 11 at the lower part in the electric dehydrator shell 1.
The electrode is a reticular honeycomb electrode 4 with a reticular exposed cross section, is made of metal wires by weaving, is arranged inside the electric dehydrator shell 1 through an insulating rod, and one end of the electrode is communicated with a power supply.
The suspension pin grounding electrode 5 is made of metal and is provided with a plurality of suspension pins arranged in parallel, and each suspension pin vertically penetrates through a flow channel in the electrode and is positioned in the center of the flow channel. The upper part of the suspension needle grounding electrode 5 is fixed in the electric dehydrator shell 1 through a suspension 12 and is conducted through the suspension 12. The surface of the suspension pin grounding electrode 5 is coated with an insulating hydrophobic layer 10. The insulating hydrophobic layer 10 is made of an insulating hydrophobic material.
The working principle and the working process are as follows: crude oil containing water to be treated enters the electric dehydrator from the oil inlet pipe 2, the reciprocating piston pump 9 enables the oil inlet amount to be changed in a pulse mode, the oil inlet pipe 2 is arranged below a water layer and has a washing effect on the crude oil, the crude oil flows upwards through an electric field area formed between the mesh-shaped honeycomb electrode 4 and a grounding water layer 11, the electric field promotes water drops to be coalesced, then the crude oil flows into a flow channel formed by the mesh-shaped honeycomb electrode 4, an uneven electric field is formed between the mesh-shaped honeycomb electrode 4 and the suspension needle grounding electrode 5, dielectrophoresis force generated by the uneven electric field enables the water drops to move towards the periphery of the flow channel, water drops with different particle sizes have different dielectrophoresis speeds, so that collision and coalescence of the water drops are promoted, meanwhile, the dielectrophoresis movement can promote the water drops to be in contact with and charged with the mesh-shaped honeycomb electrode 4, the, The water drops with different electric charge have different speeds, so as to collide and merge. In addition, dielectrophoresis and electrophoresis have droplet motion in opposite directions and collisions can occur. The surface of the suspension needle grounding electrode 5 is coated with the insulating hydrophobic layer 10, so that electric field collapse caused by conducting the electrode through a long water chain can be prevented, electric charges can be inhibited from being attached to the electrode, 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, enter an electric field area between the mesh honeycomb electrode 4 and the grounding water layer, continue to be converged under the action of the electric field, and the charged water drops are accelerated to settle under the action of electric field force. The large water drops formed by coalescence settle under the action of gravity and enter an electric field area formed between the mesh-shaped honeycomb electrode 4 and the grounded water layer 11, and the electric field in the area can not only continuously promote coalescence of the water drops, but also accelerate settlement of charged water drops. The coalescence rate of water drops can be effectively improved, so that the dehydration efficiency is improved, and the treatment capacity is increased.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (6)
1. An efficient electric dehydrator is characterized in that: the electric dehydrator comprises an electric dehydrator shell (1), and an oil inlet pipe (2), an water outlet pipe (3) and an oil outlet pipe (6) which are arranged in the electric dehydrator shell (1), wherein the oil inlet pipe (2) and the water outlet pipe (3) are arranged at the lower part of the electric dehydrator shell (1), the oil outlet pipe (6) is arranged at the upper part of the electric dehydrator shell (1), and the inlet of the oil inlet pipe (2) extends out of the electric dehydrator shell (1) and is connected with a reciprocating piston pump (9); an electrode and a suspension needle grounding electrode (5) are arranged in the electric dehydrator shell (1), the suspension needle grounding electrode (5) vertically penetrates through a flow channel in the electrode, and one side of the lower part of the electric dehydrator shell (1) is grounded;
the electrode is a reticular honeycomb electrode (4) with a reticular exposed cross section, is made of metal wires by weaving, is arranged inside the electric dehydrator shell (1) through an insulating rod, and one end of the electrode is communicated with a power supply.
2. The high efficiency electric dehydrator of claim 1 wherein: and the outlet end of the oil outlet pipe (6) and the outlet end of the water outlet pipe (3) are respectively provided with a wave absorber.
3. The high efficiency electric dehydrator of claim 1 wherein: the suspension needle grounding electrode (5) is made of metal and is provided with a plurality of suspension needles which are arranged in parallel, and each suspension needle vertically penetrates through a flow channel in the electrode and is positioned in the center of the flow channel.
4. The high efficiency electric dehydrator of claim 1 wherein: the upper part of the suspension needle grounding electrode (5) is fixed in the electric dehydrator shell (1) through a suspension (12) and is conducted through the suspension (12).
5. The high efficiency electric dehydrator of claim 1 wherein: the surface of the suspension needle grounding electrode (5) is coated with an insulating hydrophobic layer (10).
6. The high efficiency electric dehydrator of claim 1 wherein: the oil inlet pipe (2) and the water outlet pipe (3) are arranged below the liquid level of the grounding water layer (11) at the lower part in the electric dehydrator shell (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810955399.7A CN108949223B (en) | 2018-08-21 | 2018-08-21 | High-efficiency electric dehydrator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810955399.7A CN108949223B (en) | 2018-08-21 | 2018-08-21 | High-efficiency electric dehydrator |
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| CN108949223A CN108949223A (en) | 2018-12-07 |
| CN108949223B true CN108949223B (en) | 2020-09-11 |
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| CN110878219B (en) * | 2019-11-28 | 2021-12-28 | 中海油能源发展股份有限公司工程技术分公司 | High-water-content crude oil electric dehydration device |
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| CN2159833Y (en) * | 1993-06-26 | 1994-03-30 | 中国石化洛阳石油化工工程公司 | Static separator for oil from water |
| CN106524253A (en) * | 2016-11-08 | 2017-03-22 | 广东美的厨房电器制造有限公司 | Extractor hood and high voltage static module thereof |
| CN106422630A (en) * | 2016-11-15 | 2017-02-22 | 李焱 | Compound water mist electric field type purifier |
| CN207016725U (en) * | 2017-06-15 | 2018-02-16 | 中石化炼化工程（集团）股份有限公司 | Sump oil breaking emulsion and dewatering device and sump oil demulsification and dehydration device |
| CN107286974A (en) * | 2017-07-21 | 2017-10-24 | 四川达灿石油设备有限公司 | A kind of desalination structure pre-processed for crude oil |
| CN108187912A (en) * | 2018-01-24 | 2018-06-22 | 佛山市科蓝环保科技股份有限公司 | A kind of novel honeycomb electric field and the Industrial cleaning facility equipment containing the electric field |
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