CN114426365A - Oily sewage separator of electric desalting - Google Patents
Oily sewage separator of electric desalting Download PDFInfo
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- CN114426365A CN114426365A CN202010996048.8A CN202010996048A CN114426365A CN 114426365 A CN114426365 A CN 114426365A CN 202010996048 A CN202010996048 A CN 202010996048A CN 114426365 A CN114426365 A CN 114426365A
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- 238000011033 desalting Methods 0.000 title claims abstract description 49
- 239000010865 sewage Substances 0.000 title claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 238000004581 coalescence Methods 0.000 claims abstract description 34
- 238000000926 separation method Methods 0.000 claims abstract description 33
- 238000007789 sealing Methods 0.000 claims description 12
- 239000002351 wastewater Substances 0.000 claims description 12
- 239000012212 insulator Substances 0.000 claims description 9
- 239000000725 suspension Substances 0.000 claims description 9
- 238000010612 desalination reaction Methods 0.000 claims description 2
- 230000003068 static effect Effects 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 37
- 230000005684 electric field Effects 0.000 description 16
- 239000010779 crude oil Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 5
- 238000011282 treatment Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000004720 dielectrophoresis Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 238000005292 vacuum distillation Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/004—Seals, connections
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/48—Devices for applying magnetic or electric fields
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Electrostatic Separation (AREA)
Abstract
The invention discloses an oily sewage separation device for electric desalting, which comprises a horizontal cylinder, a vertical cylinder, an electrostatic coalescence unit and a second transformer, wherein a weir plate is vertically arranged on the right side in the horizontal cylinder, the vertical cylinder is vertically inserted into the left side of the horizontal cylinder, the electrostatic coalescence unit is positioned in the horizontal cylinder between the vertical cylinder and the weir plate, the electrostatic coalescence unit comprises a plurality of electrode plates arranged along the vertical direction, each electrode plate comprises a flat electrode plate and a corrugated electrode plate, an inlet pipe and a first exhaust pipe are arranged on the upper part of the vertical cylinder, an electrode assembly is arranged at the central shaft of the vertical cylinder, a top plugging assembly and a bottom plugging assembly are respectively arranged at the top and the bottom of the vertical cylinder, the first transformer is arranged in the vertical cylinder, the bottom of the first transformer is connected with the top end of the electrode assembly, and an outlet pipe is arranged at the center of the bottom plugging assembly. The invention can realize three-stage separation of oil, gas and water, greatly simplify the separation process and realize intensive separation.
Description
Technical Field
The invention relates to the technical field of an electric desalting system of an atmospheric and vacuum distillation unit in the oil refining industry, in particular to an electric desalting oily sewage separation device.
Background
The electric desalting device is one of indispensable devices in the refining industry, and the operation effect of the electric desalting device influences the long-term smooth operation of an oil refining device to a great extent. In recent years, as various large oil fields enter the middle and later development stages, enhanced oil recovery methods such as surfactants and polymer flooding are used in large quantities, and crude oil extracted from underground is seriously emulsified, so that the water quality of electric desalting sewage is more complicated, the control of oil content indexes in the sewage is more difficult, and the normal operation of a subsequent sewage treatment system is seriously influenced; meanwhile, in order to improve the utilization rate of crude oil, the recovered heavy dirty oil is subjected to primary treatment and then is mixed into the crude oil for recycling, so that the emulsification of the crude oil is further aggravated, and the water quality of the electro-desalting sewage is also deteriorated.
CN202530047U discloses an electric crude oil dehydration device, which comprises a dehydration tank body, an oil inlet, an oil outlet, an oil inlet distributor, a composite plate electrode, an insulating support, a transformer, a water outlet and a weir plate, wherein the composite plate electrode comprises a carbon steel metal pipe with the outer diameter of 5-20mm and an insulating layer with the thickness of 1-3mm uniformly coated on the outer surface of the carbon steel metal pipe. But has the following disadvantages: the electric field dehydration separation is carried out only by different electrode forms, the technical advantages of gravity settling and cyclone separation are not utilized, and the application range is narrow.
CN205046060U an oil-water separator with electric desalting and dewatering functions, which comprises a shell of a pressure vessel, a crude oil inlet and a crude oil outlet which are arranged at the upper ends of the front and the back of the shell, and a water outlet which is arranged at the lower end of the shell, wherein the shell of the pressure vessel is divided into a steady flow settling zone, an oil phase zone and a water phase zone from top to bottom; an oil-water separation coalescence plate and a weir plate are sequentially arranged in the shell between the crude oil inlet and the crude oil outlet, a first direct current electrode plate and a second direct current electrode plate are horizontally arranged behind the weir plate from top to bottom, the first direct current electrode plate is powered by a direct current high-voltage power supply outside the shell to form a direct current strong electric field area, and the second direct current electrode plate is powered by a direct current low-voltage power supply outside the shell to form a direct current weak electric field area; the oil-water separation coalescence plate and the weir plate extend into the water phase area, and the first direct current electrode plate and the second direct current electrode plate are arranged in the oil phase area. The invention integrates the functions of the oil (gas), water separator and the electric desalting and dewatering device, thereby reducing energy consumption. But has the following disadvantages: the technical advantages of gravity settling and cyclone separation are not combined, the removal of associated gas carried by equipment such as a plate heat exchanger, an electric desalting tank and the like in the prior process flow is not considered, and the application range is narrow.
The existing electric desalting sewage is directly subjected to oil-water separation by a gravity method or a rotational flow method facility arranged in an electric desalting device, the sewage is still seriously emulsified and oil-bearing, the oil content is more than 150ppm, the requirement of an inlet of a sewage treatment device cannot be met, great influence is brought to the treatment of an oil separation-flotation-biochemical process of the sewage treatment device, and the blockage of a reservoir by sewage or the generation of a large amount of oily sludge can be caused. Therefore, in order to meet higher environmental protection requirements, relieve the influence of drained oil on subsequent devices and further reduce the processing energy consumption loss of the devices, an oil-water separation device aiming at the discharged oil-containing sewage of the electric desalting device needs to be designed urgently.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the electro-desalting oily sewage separation device, which is characterized in that an electrostatic coalescence-separation module which is increasingly developed in the gathering and transportation process is arranged in the electro-desalting oily sewage separation device, and the synergistic effect of an electric field and a rotational flow field is adopted, so that a curved surface corrugated flow channel is combined, the oil content in sewage is reduced, the oil-water separation efficiency is improved, and the stable operation of the oil separation-flotation-biochemical process treatment of a subsequent device is facilitated.
In order to realize the aim, the invention provides an oily sewage separation device for electric desalting, which has the technical scheme that:
the utility model provides an oily sewage separator of electric desalination, includes horizontal barrel, its characterized in that: the oily sewage separation device for electric desalting further comprises a vertical cylinder, an electrostatic coalescence unit and a second transformer, wherein a weir plate is vertically arranged at the bottom of the horizontal cylinder on the right side in the horizontal cylinder, a water outlet is arranged at the bottom of the horizontal cylinder on the left side of the weir plate, an oil outlet is arranged at the bottom of the horizontal cylinder on the right side of the weir plate, the vertical cylinder is vertically inserted into the left side of the horizontal cylinder, the electrostatic coalescence unit is positioned in the horizontal cylinder between the vertical cylinder and the weir plate, the electrostatic coalescence unit and the second transformer are electrically connected through a high-voltage cable and a second low-voltage cable, an inlet pipe is arranged on the left side of the upper part of the vertical cylinder, a first exhaust pipe is arranged on the right side of the upper part of the vertical cylinder, an electrode assembly is arranged at the central shaft of the vertical cylinder, a top plugging assembly and a bottom plugging assembly are respectively arranged at the top and the bottom of the vertical cylinder, and a first transformer is arranged in the vertical cylinder, first transformer top is provided with the low voltage wiring end, and the bottom and the electrode subassembly top of first transformer are connected, the top and the top shutoff subassembly of first transformer carry out sealing connection, the low voltage wiring end upwards passes the top shutoff subassembly, the center department of bottom shutoff subassembly is equipped with the outlet pipe, the static coalescence unit includes a plurality of electrode plates that set up along upper and lower direction, and the electrode plate includes dull and stereotyped electrode plate and corrugated electrode plate, dull and stereotyped electrode plate and corrugated electrode plate parallel arrangement in turn, form the runner between dull and stereotyped electrode plate and the corrugated electrode plate.
According to the oil-containing sewage separation device for electric desalting, the top of the electrostatic coalescence unit is fixedly connected with the inner wall of the horizontal cylinder through the first suspension insulator, the flat plate electrode plate is connected with high voltage, and the corrugated plate electrode plate is grounded.
According to the electro-desalting oily sewage separation device, the side wall of the inlet pipe is tangent to the side wall of the vertical cylinder.
The invention relates to an oily sewage separation device for electric desalting.
According to the device for separating the oily sewage through electric desalting, the second transformer is preferably arranged inside the horizontal cylinder and arranged on the right side of the weir plate; when the second transformer is arranged inside the horizontal cylinder, a cable lead hole is formed in the right end of the horizontal cylinder, the second transformer is connected into the first low-voltage cable through the cable lead hole, and the second transformer is fixedly connected with the inner wall of the horizontal cylinder through the second suspension insulator.
The invention relates to an oily sewage separation device for electric desalting, wherein an electrode assembly comprises an electrode in a cylindrical structure, the outer wall surface of the electrode is coated with an insulating layer, and the bottom end of the electrode is connected with the inner wall surface of a vertical cylinder through an electrode bracket; the electrode and the vertical cylinder are coaxially arranged.
Preferably, the top plugging assembly comprises a sealing flange cover and an insulating rubber pad, the top end of the vertical cylinder is provided with a top end flange, the sealing flange cover is in bolted connection with the top end flange, and the insulating rubber pad is arranged between the sealing flange cover and the top end flange.
According to the oil-containing sewage separation device for electric desalting, disclosed by the invention, preferably, the bottom plugging component is an oval end socket, a bottom plugging flange is arranged on the periphery of the top end of the bottom plugging component, a bottom end flange is arranged at the bottom end of the vertical cylinder body, the bottom plugging flange is in bolt connection with the bottom end flange, and the outlet pipe is arranged at the center of the bottom plugging component.
Preferably, the electrode support comprises a plurality of radial fixed supporting legs, the radial fixed supporting legs are distributed at equal angles along the circumferential direction, and the outer side surfaces of the radial fixed supporting legs are cambered surfaces; a circular supporting groove is formed in the center of the upper surface of the radial fixed supporting leg, and an electrode is installed in the supporting groove; the inner diameter of the upper surface of the bottom plugging flange is smaller than the inner diameter of the vertical cylinder, a supporting step is formed between the inner wall surface of the bottom plugging flange and the inner wall surface of the vertical cylinder, the bottom surface of the radial fixed supporting leg is in contact with the upper surface of the supporting step, and the outer side surface of the radial fixed supporting leg is in contact with the inner wall surface of the vertical cylinder.
According to the device for separating the oily sewage through electric desalting, the number of the radial fixed supporting legs is preferably four, and the angle between the radial fixed supporting legs is 90 degrees.
According to the device for separating the oily sewage through electric desalting, disclosed by the invention, preferably, the upper part of the right side of the horizontal cylinder is provided with the second exhaust pipe, and the first exhaust pipe is communicated with the second exhaust pipe.
According to the device for separating the oily sewage through electric desalting, disclosed by the invention, preferably, the surfaces of the flat plate electrode plate and the corrugated electrode plate are coated with the compact insulating layers.
The invention is mainly used for the decompression tower top of the atmospheric and vacuum distillation unit, and has the following beneficial effects compared with the prior art:
(1) according to the electro-desalting oily sewage separation device, efficient demulsification and oil-water separation of oily sewage are realized through the vertical cylinder, the horizontal cylinder and the electrostatic coalescence unit; the vertical cylinder body adopts the synergistic effect of an electric field and a rotational flow field, and the electric field promotes water drops in oil to attract and collide with each other to be combined into large water drops; the spiral-flow field improves water droplet collision strength and frequency in the oil on the one hand, accelerates the water droplet coalescence process, and on the other hand makes water droplet in the oil form the water film at the gathering of barrel inner wall, further increases annular channel internal electric field intensity, improves water droplet coalescence efficiency in the oil.
(2) According to the electro-desalting oily sewage separation device, the flow channels in the electrostatic coalescence unit are all provided with non-uniform high-voltage electric fields, and the coalescence of dispersed phase water drops is enhanced by utilizing a dielectrophoresis phenomenon; and the runners are all curved surface corrugated channels, the collision probability of dispersed phase water drops is increased by utilizing the shallow pool theory and the turbulent flow pulsation effect, the hydraulic retention time can be obviously shortened while the oil-water separation efficiency is ensured, and the separation efficiency is improved.
The invention is described in further detail below with reference to the figures and the detailed description, without limiting the scope of the invention.
Drawings
FIG. 1 is a schematic view showing the construction of an apparatus for separating oily sewage by electric desalting of the present invention;
FIG. 2 is a schematic view showing the internal structure of a vertical cylinder in an apparatus for separating oily wastewater from electro-desalting according to the present invention;
3 FIG. 3 3 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 of 3 FIG. 3 2 3; 3
FIG. 4 is a schematic view showing the structure of an electrode holder in an apparatus for separating oily wastewater from electro-desalting according to the present invention;
FIG. 5 is a schematic view showing the construction of an electrostatic coalescer unit in an apparatus for separating oil-contaminated water by electro-desalting of the present invention;
the reference symbols shown in the figures are:
1-horizontal cylinder, 101-weir plate, 102-water outlet, 103-oil outlet, 104-cable lead hole, 105-second exhaust pipe;
2-vertical cylinder, 201-inlet pipe, 202-first exhaust pipe, 203-top plugging component, 204-bottom plugging component, 205-outlet pipe, 206-electrode, 207-insulating layer, 208-electrode support, 2081-radial fixed leg, 2082-support groove, 209-first transformer, 210-low voltage terminal, 211-sealing flange cover, 212-insulating rubber pad, 213-top flange, 214-bottom plugging flange, 215-bottom flange, 216-support step;
4-electrostatic coalescence unit, 401-first suspension insulator, 402-flat plate electrode plate, 403-corrugated electrode plate, 404-flow channel;
5-second transformer, 501-second suspension insulator, 502-first low voltage cable, 505-high voltage cable, 506-second low voltage cable.
Detailed Description
As shown in FIG. 1, the oil-contaminated water separation device for electric desalting comprises a horizontal cylinder 1, a vertical cylinder 2, an electrostatic coalescence unit 4 and a second transformer 5, wherein a weir plate 101 is vertically arranged at the bottom of the horizontal cylinder 1 at the right side inside the horizontal cylinder 1, a water outlet 102 is arranged at the bottom of the horizontal cylinder 1 at the left side of the weir plate 101, an oil outlet 103 is arranged at the bottom of the horizontal cylinder 1 at the right side of the weir plate 101, the vertical cylinder 2 is vertically inserted into the left side of the horizontal cylinder 1, the electrostatic coalescence unit 4 is arranged inside the horizontal cylinder 1 between the vertical cylinder 2 and the weir plate 101, the electrostatic coalescence unit 4 and the second transformer 5 are electrically connected through a high-voltage cable 505 and a second low-voltage cable 506, as shown in FIG. 2, an inlet pipe 201 is arranged at the left side of the upper part of the vertical cylinder 2, a first exhaust pipe 202 is arranged at the right side of the upper part of the vertical cylinder 2, an electrode assembly is arranged at the central axis of the vertical cylinder 2, the top and the bottom of the vertical cylinder 2 are respectively provided with a top plugging component 203 and a bottom plugging component 204, a first transformer 209 is arranged inside the vertical cylinder 2, the first transformer 209 is positioned above the inlet pipe 201 and the first exhaust pipe 202, the top of the first transformer 209 is provided with a low-voltage terminal 210, the bottom of the first transformer 209 is connected with the top end of the electrode assembly, the top end of the first transformer 209 is hermetically connected with the top plugging component 203, the low-voltage terminal 210 upwards passes through the top plugging component 203, the center of the bottom plugging component 204 is provided with an outlet pipe 205, the top of the electrostatic coalescence unit 4 is fixedly connected with the inner wall of the horizontal cylinder 1 through a first suspension insulator 401, the electrostatic coalescence unit 4 comprises a plurality of electrode plates arranged along the up-down direction, and the electrode plates comprise a flat electrode plate 402 and a corrugated electrode plate 403, the flat plate electrode plates 402 and the corrugated electrode plates 403 are alternately arranged in parallel, a flow channel 404 is formed between the flat plate electrode plates 402 and the corrugated electrode plates 403, the flat plate electrode plates 402 are connected with high voltage, and the corrugated electrode plates 403 are grounded.
The second transformer 5 is preferably arranged inside the horizontal cylinder 1 and arranged on the right side of the weir plate 101; when the second transformer 5 is arranged inside the horizontal cylinder 1, the right end of the horizontal cylinder 1 is provided with the cable lead hole 104, the second transformer 5 is connected to the first low-voltage cable 502 through the cable lead hole 104, and the second transformer 5 is fixedly connected with the inner wall of the horizontal cylinder 1 through the second suspension insulator 501. The second transformer 5 is arranged in the oil chamber of the horizontal cylinder 1 and is submerged by insulating oil to provide a high-voltage power supply for the electrostatic coalescence unit 4, and when the second transformer 5 is internally designed, low-voltage electricity can be introduced from the outside through the first low-voltage cable 502.
As shown in fig. 2-3, the sidewall of the inlet pipe 201 is tangential to the sidewall of the vertical cylinder 2, and the inlet pipe 201 is a tapered inlet. Oily sewage tangentially enters the vertical cylinder 2 through the inlet pipe 201, a rotational flow field is formed in the vertical cylinder 2, and the gradually-reduced arrangement of the inlet pipe 201 can ensure that the rotational flow reaches the required rotational flow strength and turbulence strength; the right side of the upper part of the vertical cylinder 2 is provided with a first exhaust pipe 202, and the first exhaust pipe 202 timely exhausts volatilized light components to prevent the device from generating air resistance; the top and the bottom of the vertical cylinder 2 are respectively provided with a top plugging component 203 and a bottom plugging component 204, the center of the bottom plugging component 204 is provided with an outlet pipe 205, and the outlet pipe 205 discharges oily sewage with water droplet size obviously increased after the synergistic action of the electric field and the rotational flow field into the subsequent horizontal cylinder 1.
As shown in fig. 2, an electrode assembly including an electrode 206 having a cylindrical structure is disposed at a central axis of the vertical cylinder 2, thereby forming an annular passage between the vertical cylinder 2 and the electrode 206; the outer wall surface of the electrode 206 is coated with an insulating layer 207, and the bottom end of the electrode 206 is connected with the inner wall surface of the vertical cylinder 2 through an electrode bracket 208; the electrode 206 is coaxially arranged with the vertical cylinder 2; wherein the insulating layer 207, the electrode 206 and the vertical cylinder 2 are coaxially arranged to ensure that the electric field in the device is uniformly distributed and no electric breakdown occurs when oily sewage with high water content is treated.
As shown in fig. 2, a first transformer 209 is arranged inside the vertical cylinder 2, and a low-voltage terminal 210 is arranged at the top of the first transformer 209; the bottom of the first transformer 209 is connected with the top end of the electrode 206, the top end of the first transformer 209 is hermetically connected with the top plugging component 203, and the low-voltage terminal 210 penetrates through the top plugging component 203 upwards; when the vertical cylinder 2 is used, the vertical cylinder 2 is grounded to be used as a low-voltage electrode, external low-voltage alternating current is connected to the first transformer 209 through the low-voltage terminal 210, is converted into high-voltage alternating current through the first transformer 209 and then is applied to the electrode 206, and a high-voltage electric field is formed in an annular channel between the vertical cylinder 2 and the electrode 206; wherein the first transformer 209 is built-in and the high voltage wires outside the device are replaced by low voltage terminals 210, ensuring the operation safety of the device.
The electrostatic coalescence unit 4 is positioned inside the horizontal cylinder 1 between the vertical cylinder 2 and the weir plate 101; the top of the electrostatic coalescence unit 4 is fixedly connected with the inner wall of the horizontal cylinder 1 through a first suspension insulator 401; the electrostatic coalescing unit 4 comprises a plurality of electrode plates arranged along the up-down direction, that is, the electrode plates are horizontally arranged, the electrode plates comprise a flat electrode plate 402 and a corrugated electrode plate 403, the flat electrode plate 402 and the corrugated electrode plate 403 are alternately arranged in parallel, and a flow channel 404 is formed between the flat electrode plate 402 and the corrugated electrode plate 403; the flat plate electrode plate 402 is connected with high voltage, and the corrugated electrode plate 403 is grounded; a non-uniform high-voltage electric field is formed between the flat plate electrode plate 402 and the corrugated electrode plate 403 in the electrostatic coalescence unit 4, the coalescence of dispersed phase water drops is enhanced by utilizing a dielectrophoresis phenomenon, the collision probability of the dispersed phase water drops is increased by utilizing a shallow pool theory and a turbulent pulsation effect in the flow channel 404, and the hydraulic retention time can be obviously shortened.
Preferably, as shown in fig. 2, the top blocking assembly 203 comprises a sealing flange cover 211 and an insulating rubber pad 212, the top end of the vertical cylinder 2 is provided with a top end flange 213, the sealing flange cover 211 is bolted to the top end flange 213, and the insulating rubber pad 212 is arranged between the sealing flange cover 211 and the top end flange 213.
Preferably, as shown in fig. 2, the bottom plugging component 204 is an elliptical head, a bottom plugging flange 214 is arranged on the periphery of the top end of the bottom plugging component 204, a bottom end flange 215 is arranged at the bottom end of the vertical cylinder 2, the bottom plugging flange 214 is in bolt connection with the bottom end flange 215, and the outlet pipe 205 is arranged at the center of the bottom plugging component 204.
Preferably, as shown in fig. 4, the electrode holder 208 includes a plurality of radial fixing legs 2081, the radial fixing legs 2081 are distributed at equal angles along the circumferential direction, and the outer side surface of the radial fixing leg 2081 is an arc surface; a circular support groove 2082 is formed in the center of the upper surface of the radial fixed leg 2081, and an electrode 206 is installed in the support groove 2082; the inner diameter of the upper surface of the bottom plugging flange 214 is smaller than the inner diameter of the vertical cylinder 2, a supporting step 216 is formed between the inner wall surface of the bottom plugging flange 214 and the inner wall surface of the vertical cylinder 2, the bottom surface of the radial fixed leg 2081 contacts with the upper surface of the supporting step 216, the outer side surface of the radial fixed leg 2081 contacts with the inner wall surface of the vertical cylinder 2, and the electrode support 208 is supported on the supporting step 216.
Preferably, the number of the radial fixing legs 2081 is four, and the angle between the radial fixing legs 2081 is 90 °; the arrangement of the four radial fixed supporting legs 2081 can ensure that the water drops collided and coalesced in the oily sewage are not damaged to the maximum extent, and the coalescing effect is ensured.
Preferably, a second exhaust pipe 105 is arranged at the upper part of the right side of the horizontal cylinder 1, and the first exhaust pipe 202 is communicated with the second exhaust pipe 105; the second exhaust pipe 202 discharges the volatilized light components in time.
Preferably, the surfaces of the flat plate electrode plate 402 and the corrugated electrode plate 403 are coated with dense insulating layers, so that electrical breakdown can be effectively prevented.
The invention relates to an electro-desalting oily sewage separation device, which has the following specific implementation modes:
the vertical cylinder 2 is grounded to be used as a low-voltage electrode, external low-voltage alternating current is connected to a built-in first transformer 209 through a low-voltage terminal 210, is converted into high-voltage alternating current through the first transformer 209 and then is applied to the electrode 206, and a high-voltage electric field is formed in an annular channel between the vertical cylinder 2 and the electrode 206; the external low-voltage alternating current is connected to the built-in second transformer 5 through the first low-voltage cable 502, and is converted into high-voltage alternating current through the second transformer 5 to provide high-voltage power for the electrostatic coalescence unit 4.
Oily sewage enters the annular flow channel from the tangential inlet pipe 201 to form a swirling flow field; in a cyclone field, the difference of centrifugal forces borne by oil and water phases is caused by the density difference of oil and water, and water drops with higher density radially move to the inner wall of the cylinder body; under the action of the electric field of the vertical cylinder 2, water drops in the oil are subjected to polarization and electrostatic induction of a high-voltage electric field, so that two ends of the water drops are provided with charges with different electric properties to form induced dipoles, and positive and negative dipoles of adjacent water drops attract each other to promote the water drops to approach each other so as to be coalesced; meanwhile, the action of the rotational flow field enables the water drops with high density to radially move to the inner wall of the cylinder, the water drops are converged on the inner wall of the cylinder to form a water film, the thickness of the water film is continuously increased from top to bottom, the electrode spacing is continuously reduced, the electric field intensity is continuously increased, and the convergence of the water drops in the oil is further promoted; finally, the oily sewage with the significantly increased water droplet particle size is discharged from the outlet pipe 205 and enters the horizontal cylinder 1; the oily sewage entering the horizontal cylinder 1 firstly enters the electrostatic coalescence unit 4 for secondary separation, the oily sewage layer passing through the electrostatic coalescence unit 4 is thinned, the particle size of separated phase water drops is increased, and then the separated phase water drops enter a later settling section for tertiary separation; the finally separated water is separated out through a water outlet 102, and the separated oil overflows the weir plate 101 into the oil chamber and is separated out through an oil outlet 103.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited thereto, and various modifications and changes that can be made by those skilled in the art without inventive efforts based on the technical solution of the present invention are within the scope of the present invention.
Claims (13)
1. The utility model provides an oily sewage separator of electric desalination, includes horizontal barrel, its characterized in that: the oily sewage separation device for electric desalting further comprises a vertical cylinder, an electrostatic coalescence unit and a second transformer, wherein a weir plate is vertically arranged at the bottom of the horizontal cylinder on the right side in the horizontal cylinder, a water outlet is arranged at the bottom of the horizontal cylinder on the left side of the weir plate, an oil outlet is arranged at the bottom of the horizontal cylinder on the right side of the weir plate, the vertical cylinder is vertically inserted into the left side of the horizontal cylinder, the electrostatic coalescence unit is positioned in the horizontal cylinder between the vertical cylinder and the weir plate, the electrostatic coalescence unit and the second transformer are electrically connected through a high-voltage cable and a second low-voltage cable, an inlet pipe is arranged on the left side of the upper part of the vertical cylinder, a first exhaust pipe is arranged on the right side of the upper part of the vertical cylinder, an electrode assembly is arranged at the central shaft of the vertical cylinder, a top plugging assembly and a bottom plugging assembly are respectively arranged at the top and the bottom of the vertical cylinder, and a first transformer is arranged in the vertical cylinder, first transformer top is provided with the low voltage wiring end, and the bottom and the electrode subassembly top of first transformer are connected, the top and the top shutoff subassembly of first transformer carry out sealing connection, the low voltage wiring end upwards passes the top shutoff subassembly, the center department of bottom shutoff subassembly is equipped with the outlet pipe, the static coalescence unit includes a plurality of electrode plates that set up along upper and lower direction, and the electrode plate includes dull and stereotyped electrode plate and corrugated electrode plate, dull and stereotyped electrode plate and corrugated electrode plate parallel arrangement in turn, form the runner between dull and stereotyped electrode plate and the corrugated electrode plate.
2. The apparatus for separating oily wastewater for electric desalting as claimed in claim 1, wherein: the side wall of the inlet pipe is tangent to the side wall of the vertical cylinder.
3. The apparatus for separating oily sewage through electro-desalting as set forth in claim 1 or 2, wherein: the inlet tube is a tapered inlet tube.
4. The apparatus for separating oily wastewater for electric desalting as claimed in claim 1, wherein: the top of the electrostatic coalescence unit is fixedly connected with the inner wall of the horizontal cylinder through a first suspension insulator, the flat plate electrode plate is connected with high voltage, and the corrugated plate electrode plate is grounded.
5. The apparatus for separating oily wastewater for electric desalting as claimed in claim 1, wherein: the second transformer is arranged in the horizontal cylinder and arranged on the right side of the weir plate; when the second transformer is arranged inside the horizontal cylinder, a cable lead hole is formed in the right end of the horizontal cylinder, the second transformer is connected into the first low-voltage cable through the cable lead hole, and the second transformer is fixedly connected with the inner wall of the horizontal cylinder through the second suspension insulator.
6. The apparatus for separating oily wastewater for electric desalting as claimed in claim 1, wherein: the electrode assembly comprises an electrode in a cylindrical structure, the outer wall surface of the electrode is coated with an insulating layer, and the bottom end of the electrode is connected with the inner wall surface of the vertical cylinder through an electrode support; the electrode and the vertical cylinder are coaxially arranged.
7. The apparatus for separating oily wastewater for electric desalting as claimed in claim 1, wherein: the top plugging assembly comprises a sealing flange cover and an insulating rubber pad, a top end flange is arranged at the top end of the vertical cylinder body, the sealing flange cover is in bolted connection with the top end flange, and the insulating rubber pad is arranged between the sealing flange cover and the top end flange.
8. The apparatus for separating oily wastewater for electric desalting as claimed in claim 1, wherein: the bottom plugging assembly is an oval end socket, a bottom plugging flange is arranged on the periphery of the top end of the bottom plugging assembly, a bottom end flange is arranged at the bottom end of the vertical cylinder body, the bottom plugging flange is connected with the bottom end flange through bolts, and the outlet pipe is arranged at the center of the bottom plugging assembly.
9. The apparatus for separating oily wastewater for electric desalting as claimed in claim 6, wherein: the electrode support comprises a plurality of radial fixed supporting legs, the radial fixed supporting legs are distributed at equal angles along the circumferential direction, and the outer side surfaces of the radial fixed supporting legs are cambered surfaces; the center of the upper surface of the radial fixed supporting leg is provided with a circular supporting groove, and an electrode is arranged in the supporting groove.
10. The apparatus for separating oily wastewater for electric desalting as claimed in claim 1, wherein: the electrode assembly comprises an electrode in a cylindrical structure, the bottom end of the electrode is connected with the inner wall surface of the vertical cylinder through an electrode support, and the electrode and the vertical cylinder are coaxially arranged; the electrode support comprises a plurality of radial fixed support legs, the bottom plugging assembly is an oval end socket, a bottom plugging flange is arranged on the periphery of the top end of the bottom plugging assembly, the inner diameter of the upper surface of the bottom plugging flange is smaller than that of the vertical cylinder, a supporting step is formed between the inner wall surface of the bottom plugging flange and the inner wall surface of the vertical cylinder, the bottom surfaces of the radial fixed support legs are in contact with the upper surface of the supporting step, and the outer side surfaces of the radial fixed support legs are in contact with the inner wall surface of the vertical cylinder.
11. The apparatus for separating oily sewage through electro-desalting as claimed in claims 9 and 10, wherein: the number of the radial fixed supporting legs is four, and the angle between the radial fixed supporting legs is 90 degrees.
12. The apparatus for separating oily wastewater for electric desalting as claimed in claim 1, wherein: and a second exhaust pipe is arranged at the upper part of the right side of the horizontal cylinder, and the first exhaust pipe is communicated with the second exhaust pipe.
13. The apparatus for separating oily wastewater for electric desalting as claimed in claim 1, wherein: and compact insulating layers are coated on the surfaces of the flat plate electrode plate and the corrugated electrode plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010996048.8A CN114426365A (en) | 2020-09-21 | 2020-09-21 | Oily sewage separator of electric desalting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010996048.8A CN114426365A (en) | 2020-09-21 | 2020-09-21 | Oily sewage separator of electric desalting |
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| CN114426365A true CN114426365A (en) | 2022-05-03 |
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| CN202010996048.8A Pending CN114426365A (en) | 2020-09-21 | 2020-09-21 | Oily sewage separator of electric desalting |
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| CN202530047U (en) * | 2012-02-09 | 2012-11-14 | 中国石油化工股份有限公司 | Electric dehydration device for crude oil |
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