CN119912129B - Coalescing filter tank for oily wastewater treatment - Google Patents
Coalescing filter tank for oily wastewater treatment Download PDFInfo
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Abstract
The invention discloses a coalescing filter tank for oil-containing wastewater treatment, relates to the technical field of filter tanks, and solves the technical problems that in the oil-containing wastewater treatment process, when more oil-containing wastewater is treated, the wastewater treatment capacity of a single filter area is small and the filtration is not clean; the oil-water separation type oil-water separation tank comprises a tank body, wherein the inside of the tank body is sequentially divided into a first left filtering area, a middle pretreatment area and a second right filtering area from left to right, the middle pretreatment area comprises a cyclone vertically arranged at the middle position of the tank body, a plurality of groups of separation inclined plates for separating oil from water are arranged above the cyclone, and the water separated from the middle pretreatment area enters the first left filtering area and the second right filtering area respectively.
Description
Technical Field
The invention belongs to the technical field of filter tanks, and particularly relates to a coalescing filter tank for treating oily wastewater.
Background
Oily wastewater is a type of wastewater produced during petroleum exploitation and production. The oily wastewater has complex components, high oil content and high mineralization degree, can cause equipment damage and pipeline or stratum blockage to influence the safe production if untreated and directly reinjected, and can also pollute water and atmosphere if directly discharged into soil to influence the activity of soil microorganisms, so that a filter tank is used for purifying the oily wastewater.
In the existing treatment process of oily wastewater by some filtering tanks, when the oil content of the wastewater is high, a filtering bed and a filter element are easy to pollute and block, the performances of the filtering material and the filter element are difficult to recover by back flushing, when the incoming water content is suddenly increased, the single filtering area cannot meet the production requirement, the pressure is high, the filtering is not clean, when the filter element is dirty, the filter element is required to be stopped for replacement, the filter after the replacement can be used for treating the oily wastewater again, and the problem of high shutdown cost exists.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and therefore, the invention provides a coalescing filter tank for treating oily wastewater.
A coalescing filter tank for treating oily wastewater, comprising:
the tank body is internally divided into a first left filtering area, a middle pretreatment area and a second right filtering area from left to right in sequence;
the middle pretreatment area comprises a cyclone vertically arranged in the middle of the tank body, a plurality of groups of separation inclined plates for oil-water separation are arranged above the cyclone, and the water separated from the middle pretreatment area enters the first left filtering area and the second right filtering area respectively and is filtered by filter beds and filter elements arranged in the first left filtering area and the second right filtering area.
Preferably, the middle pretreatment area further comprises a first water inlet arranged on the front surface of the tank body, and the rear end of the first water inlet is communicated with the cyclone and supplies water to the interior of the cyclone.
Preferably, the middle pretreatment area further comprises a baffle plate horizontally arranged on the inner wall of the tank body and positioned at the upper end part of the cyclone, and a small number of water delivery holes are formed in the upper surface of the baffle plate.
Preferably, a waste water cavity is formed among the cyclone, the partition plate and the inner wall of the tank body, and a first water outlet communicated with the water cavity is formed in the bottom of the tank body.
Preferably, the first left filtering area and the second right filtering area have the same structure, and the first left filtering area comprises:
the filter bed is horizontally arranged in the tank body, a guide inclined plate positioned below the filter bed is arranged in the tank body, and a water storage cavity is formed between the lower surface of the guide inclined plate and the inner wall of the tank body;
the second water inlet is arranged on the upper surface of the left end of the tank body, and a left water pipe is arranged between the second water inlet and the first water outlet;
the third water inlet is arranged on the upper surface of the right end of the tank body, and a right water pipe is arranged between the third water inlet and the first water outlet;
and two groups of filter elements longitudinally distributed between the lower part of the guide inclined plate and the inner wall of the tank body.
Preferably, the surface of the guide inclined plate is provided with a plurality of water holes, and the lower surface of the left end of the tank body is provided with a second water outlet communicated with the filter element;
The lower surface of the right end of the tank body is provided with a third water outlet communicated with the filter element.
Preferably, the left filtering first area further comprises a water distribution pipe positioned above the filter bed, the water distribution pipe is connected with the second water inlet, and a plurality of water distribution openings are uniformly formed in the surface of the water distribution pipe.
Preferably, the inside washing structure that washs the filter material in the filter bed that all is provided with of left side filtration first district and right side filtration second district, washing structure includes:
a scrubbing barrel for cleaning the filter material;
the material distribution barrel extends to the upper part of the filter bed, the material distribution barrel is Y-shaped, and a material distribution opening at the lower end of the material distribution barrel extends towards two ends of the filter bed;
a left electric valve I and a right electric valve II which control the filter material of the scrubbing barrel to enter the cloth barrel;
and a back flush discharge port arranged at the bottom of the tank body, wherein the back flush discharge port is positioned between the two guide sloping plates.
Preferably, the flushing structure further comprises a drain pipe communicated with the interior of the scrubbing barrel, and a valve nine is arranged on the drain pipe.
Preferably, the top of the tank body is provided with oil collecting devices which are respectively communicated with the left filtering first area, the middle pretreatment area and the right filtering second area, the top of the oil collecting devices is provided with an oil-water interface instrument, and oil collecting pipes are arranged among the plurality of oil collecting devices.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, the middle pretreatment areas are added in the left filtering area and the right filtering area, most of oil stains in the oily wastewater can be removed through the cyclone, and the pollution of the oil stains to the rear filter bed and the filter core is reduced.
(2) According to the invention, the first mode of oil-water treatment is matched with the first left filtering area, the middle pretreatment area and the second right filtering area, so that the filtering treatment procedure is increased, the multi-stage filtering treatment of the wastewater can be realized, the treatment effect and the cleanliness of the oily wastewater are improved, and the quality of treated water is ensured to be qualified.
(3) According to the invention, the middle pretreatment area, the left filtering area and the right filtering area are matched to carry out the second mode of oil-water treatment, so that the wastewater treatment capacity is large, and the emergency treatment of sudden increase of front-end wastewater can be realized.
(4) According to the invention, through the third mode of matching the left filtering first area, the middle pretreatment area and the right filtering second area with oil-water treatment, when the filter element in the left filtering first area or the right filtering second area is more dirty and needs to be replaced, the left filtering first area or the right filtering second area can work independently, so that continuous treatment of oily wastewater can be ensured, the trouble of shutdown of the whole filtering tank to replace the filter element can be avoided, the shutdown cost is reduced, and the continuous filtering or treatment effect of the oily wastewater is improved.
(5) According to the invention, through the fourth mode of matching the left filtering first area, the middle pretreatment area and the right filtering second area with oil-water treatment, when the filter material in the left filtering first area is cleaned, the wastewater in the middle pretreatment area firstly enters the left filtering first area for filtering through the first water outlet, and the filtered water in the left filtering first area enters the right filtering second area for filtering through the second water outlet, so that the synchronous operation of filter material cleaning and multistage treatment is realized, and the efficient treatment of the oily wastewater is realized.
(6) According to the invention, through the fifth mode of matching the left filtering first area, the middle pretreatment area and the right filtering second area with oil-water treatment, when the filter material in the right filtering second area is cleaned, the wastewater in the middle pretreatment area firstly enters the right filtering second area for filtering through the first water outlet, and the filtered water in the right filtering second area enters the left filtering first area for filtering through the third water outlet, so that the synchronous operation of filter material cleaning and multistage treatment is realized, and the efficient treatment of the oily wastewater is realized.
Drawings
FIG. 1 is a schematic diagram of the flow of wastewater treatment in a filter tank according to the present invention;
FIG. 2 is a schematic view of the configuration of the central pretreatment zone of FIG. 1 in accordance with the present invention;
FIG. 3 is an enlarged view of area A of FIG. 1 in accordance with the present invention;
FIG. 4 is a schematic view of the water distribution pipe in FIG. 1 according to the present invention;
FIG. 5 is a schematic illustration of the flushing structure of FIG. 1 in accordance with the present invention;
The device comprises a tank body, a cyclone, a first water inlet, a partition plate, a separation inclined plate, a first water outlet, a right water pipe, a second water outlet, a filter element, a left water pipe, a guide inclined plate, a filter bed, a second water inlet, a blow-down pipe, a 15 water collecting pipe, a 16 oil-water interface instrument, a 17 flushing structure, a 18 blow-down outlet, a 19 water distribution pipe, a 20 back flushing discharge outlet, a 21 scrubbing bucket, a 22, a cloth bucket, a 23, a valve eight, a 24, a valve six, a 25, a valve three, a 26, a valve five, a 27, a valve seven, a 28, a valve nine, a 29, a valve thirteen, a 30, a valve one, a 31, a valve two, a 32, a valve four, a 33, a third water inlet, a 34, a third water outlet, a 35, an electric valve one, a 36 and an electric valve two.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1-3, the present application provides a coalescing filter tank for treating oily wastewater, comprising:
the device comprises a tank body 1, wherein the interior of the tank body 1 is sequentially divided into a left filtering first area, a middle pretreatment area and a right filtering second area from left to right;
The middle pretreatment area comprises a cyclone 2 vertically arranged in the middle of a tank body 1, a plurality of groups of separation inclined plates 5 for oil-water separation are arranged above the cyclone 2, waste water enters the cyclone 2 through a first water inlet 3, oil is conveniently and rapidly separated by the cyclone 2, oil flows out of the middle upper part of the cyclone 2, is dehydrated by the separation inclined plates 5, and enters a left filtering first area and a right filtering second area respectively, and is filtered by filter beds 12 arranged in the left filtering first area and the right filtering second area respectively, the middle pretreatment area further comprises a first water inlet 3 arranged on the front surface of the tank body 1, and the rear end of the first water inlet 3 is communicated with the cyclone 2 and supplies water to the interior of the cyclone 2.
In this embodiment, preferably, the middle pretreatment area further includes a partition plate 4 horizontally installed on the inner wall of the tank body 1 and located at the upper end of the cyclone 2, water on the separation inclined plate 5 can flow downwards along the inclined plane thereof and pass through the water delivery Kong Lajin waste water cavity, a small amount of water delivery holes are formed in the upper surface of the partition plate 4, when the setting of the water delivery holes can ensure that the liquid delivery fluctuates, the upper separation inclined plate 5 is not impacted, so that the waste water separated by the separation inclined plate 5 can be conveniently re-entered into the waste water cavity, and the waste water degreasing effect is improved.
In this embodiment, preferably, a waste water cavity is formed between the cyclone 2, the partition plate 4 and the inner wall of the tank 1, and a first water outlet 6 communicated with the water cavity is arranged at the bottom of the tank 1, so that pretreated waste water is conveniently discharged.
In summary, the incoming water firstly enters the cyclone 2 through the first water inlet 3, in the cyclone 2, the water moves downwards and flows out from the lower part of the cyclone 2, the oil flows out from the upper part of the cyclone 2, then the oil is dehydrated through the separation inclined plate 5, the oil is collected by the oil collecting device upwards along the separation inclined plate 5, the water on the separation inclined plate 5 flows downwards along the inclined plane, enters the waste water cavity through the water delivery holes on the partition plate 4, the first left filtering area, the middle pretreatment area and the second right filtering area are matched with the first mode for oil-water treatment, the water flowing out from the lower part of the cyclone 2 enters the waste water cavity, then is discharged from the first water outlet 6, enters the second water inlet 13 in the first left filtering area through the valve second 31 and the left water pipe 10, and falls on the filter bed 12 through the water distribution hole on the water distribution pipe 19, the filter material in the filter bed 12 is filtered, the waste water after being filtered through the inclined plate passes through the guide 11 and enters the filter core 9, the purified water passes through the valve fifth 26, and passes through the valve fourth 32 and the second water inlet 13 on the right filtering area, and passes through the guide filter bed 9, the second water inlet 13 on the filter bed is purified, the filter quality is improved, and the quality of the waste water can be purified, and the quality can be improved, and the quality of the quality can be filtered and improved, and the quality can be filtered and treated by the filter step is improved.
In summary, the incoming water firstly enters the cyclone 2 through the first water inlet 3, in the cyclone 2, the water moves downwards and flows out of the lower part of the cyclone 2, the oil flows out of the upper part of the cyclone 2, then is dehydrated through the separation inclined plate 5, the oil is collected by the oil collecting device upwards along the separation inclined plate 5, the water on the separation inclined plate 5 flows downwards along the inclined plane, enters the waste water cavity through the water delivery holes on the partition plate 4, the middle pretreatment area is matched with the first left filtering area and the second filtering area for oil-water treatment in a second mode, the water flowing out of the lower part of the cyclone 2 enters the waste water cavity, then is discharged from the first water outlet 6, and enters the second water inlet 13 in the first left filtering area, the second valve 31 and the third water inlet 33 in the second right filtering area in parallel through the first valve 30, the second valve 31 and the right water pipe 7, and falls on the filter bed 12 through the water distribution hole on the water distribution pipe 19, the waste water after preliminary filtration enters the filter element 9 for treatment through the water delivery holes on the partition plate 4, the filter element 9 for treatment through the guide 11, and the water after filtration is subjected to the filter element 9 for filtration, the purified water is delivered through the seventh valve 27 and the eighth mode, and the emergency treatment capacity is increased, and the front treatment capacity can be realized.
Example two
Referring to fig. 1, 4 and 5, a second embodiment of the present invention is shown.
In this embodiment, preferably, the first left filtering area and the second right filtering area have the same structure, and the first left filtering area includes:
the filter bed 12 is horizontally arranged in the tank body 1, a guide inclined plate 11 positioned below the filter bed 12 is arranged in the tank body 1, and a water storage cavity is formed between the lower surface of the guide inclined plate 11 and the inner wall of the tank body 1;
The second water inlet 13 is arranged on the upper surface of the left end of the tank body 1, so that wastewater discharged from the middle pretreatment area can be conveniently conveyed into the left filtering first area for treatment, a left water pipe 10 is arranged between the second water inlet 13 and the first water outlet 6, a valve II 31 is arranged on the left water pipe 10, and drain outlets 18 are arranged at the left bottom and the right bottom of the tank body 1;
the third water inlet 33 is arranged on the upper surface of the right end of the tank body 1, and a right water pipe 7 is arranged between the third water inlet 33 and the first water outlet 6;
and four groups of filter elements 9 longitudinally distributed between the lower part of the guide inclined plate 11 and the inner wall of the tank body 1, wherein the filter elements 9 can be arranged to be pulled out according to the requirement, so that the filter elements 9 can be conveniently replaced and cleaned.
In this embodiment, preferably, the surface of the guiding inclined plate 11 is provided with a plurality of water through holes, so that water can conveniently enter the filter element 9 for treatment, the lower surface of the left end of the tank body 1 is provided with a second water outlet 8 communicated with the filter element 9, the lower surface of the right end of the tank body 1 is provided with a third water outlet 34 communicated with the filter element 9, a left water pipe 10 is arranged between the first water outlet 6 and the left second water inlet 13, and a right water pipe 7 is arranged between the first water outlet 6 and the right third water inlet 33. The left water pipe 10 is provided with a valve II 31, the right water pipe 7 is provided with a valve I30, the second water outlet 8 and the third water outlet 34 are both connected with water pipes, the two water pipes are respectively provided with a valve seven 27 and a valve eight 23, the left water pipe 10 and the right water pipe 7 are respectively connected with two branch pipes, the two branch pipes are respectively provided with a valve IV 32 and a valve III 25, a connecting water pipe is respectively arranged between the two branch pipes and the two water pipes, and the two connecting water pipes are provided with a valve V26 and a valve VI 24.
In this embodiment, preferably, the left filtering first area further includes a water distribution pipe 19 located above the filter bed 12, the water distribution pipe 19 is connected with the second water inlet 13, and a plurality of water distribution ports are uniformly formed on the surface of the water distribution pipe 19, so that uniform water distribution to the filter bed 12 is facilitated, and wastewater is conveniently and fully filtered by the filter bed 12.
In combination, the left filtering first area, the middle pretreatment area and the right filtering second area are matched with three modes of oil-water treatment, when the filter element 9 in the left filtering first area is replaced, the right filtering second area works, the concrete working flow is that water flowing out of the lower part of the cyclone 2 enters a waste water cavity, then enters a third water inlet 33 of the right filtering second area from a right water pipe 7 and a valve I30 connected with a first water outlet 6, flows downwards after being filtered by a filter material of a right filter bed 12 and is filtered by a filter element 9, purified water is conveyed outwards through a valve eight 23, when the filter element 9 in the right filtering second area is replaced, the left filtering first area works, the concrete working flow is that water flowing out of the lower part of the cyclone 2 enters the waste water cavity, then enters a second water inlet 13 of the left filtering first area from a left water pipe 10 and a valve I30 connected with the first water outlet 6, flows downwards after being filtered by the left filter bed 12 and is conveyed outwards through a valve seven 27 after being filtered by the filter element 9, the continuous treatment of the waste water containing oil can be ensured, no trouble is caused by the replacement of the filter element 9, and the continuous treatment of the waste water containing oil is reduced, and the continuous treatment effect of the filter element containing oil is reduced.
Example III
Referring to fig. 5, a third embodiment of the present invention is shown.
In this embodiment, preferably, the inside of the first left filtering area and the inside of the second right filtering area are both provided with a flushing structure 17 for cleaning the filter material in the filter bed 12, and the flushing structure 17 includes:
a scrubbing barrel 21 for cleaning the filter material, wherein the scrubbing barrel 21 is used for cleaning the filter material, a pipeline is connected to the scrubbing barrel 21, and a valve nine 28 is arranged on the pipeline;
The cloth barrel 22 extends to the upper part of the filter bed 12, the cloth barrel 22 is Y-shaped, the cloth opening at the lower end of the cloth barrel extends towards the two ends of the filter bed 12, so that the filter material is convenient to refill the filter bed 12, the distribution range of the filter material is large, and the filter material cannot be gathered in the middle of the filter bed 12;
The filter material of the scrubbing barrel 21 is controlled to enter a first left electric valve 35 and a second right electric valve 36 of the cloth barrel 22;
And a back flush discharge port 20 arranged at the bottom of the tank body 1, wherein the back flush discharge port 20 can be used for introducing cleaning water and filter materials into a scrubbing barrel 21, and the back flush discharge port 20 is positioned between the two guide inclined plates 11.
In this embodiment, the flushing structure 17 preferably further includes a drain pipe 14 communicating with the inside of the scrubbing tub 21, so as to facilitate the drainage of sewage.
In this embodiment, preferably, the top of the tank 1 is provided with oil collecting devices respectively communicated with the first left filtering area, the middle pretreatment area and the second right filtering area, the top of the oil collecting devices is provided with an oil-water interface instrument 16, oil collecting pipes 15 are arranged among the oil collecting devices, and valves are arranged on the oil collecting pipes 15 at the tops of the oil collecting devices.
In combination, when the left filtering area, the middle pre-treatment area and the right filtering area are matched with four modes of oil-water treatment, and when the filter bed 12 in the left filtering area is more dirty and needs to clean the filter material, the left filtering area and the right filtering area are connected in series, the specific working process is that water flowing out of the lower part of the cyclone 2 enters the waste water cavity, then enters the second water inlet 13 of the left filtering area from the first water outlet 6 through the valve II 31, flows downwards after being filtered by the filter material in the left filtering area 12, enters the purifying cavity after being filtered by the filter element 9, then enters the third water inlet 33 after being filtered by the filter material in the left filtering area, flows downwards after being filtered by the valve V26 and the valve III 25, enters the purifying cavity after being filtered by the filter element 9, and is conveyed outwards by the valve V23, then opens the valve V28, the filter material in the lower funnel is pressed into the upper scrubbing barrel 21 under the action of water pressure, the filter material is scrubbed by the action of cleaning agent, the filter material is scrubbed by the valve V21, the filter material is scrubbed by the lower than the valve V21, the filter material is discharged from the upper part of the scrubbing barrel 21, and the filter material is cleaned by the valve V2, and the filter material is cleaned by the valve V is opened, and the filter material is cleaned by the valve V12.
When the filter bed 12 in the second filtering area is more dirty and needs to be cleaned, the second filtering area and the first filtering area are connected in series, the water flowing out of the lower part of the cyclone 2 enters the waste water cavity, then enters the third water inlet 33 of the second filtering area from the first water outlet 6 through the valve I30, flows downwards after being filtered by the filter material in the left filtering area 12, the filtered water enters the purifying cavity after being filtered by the filter element 9, the purified water in the second filtering area flows downwards after being filtered by the valve VI 24 and the valve IV 32, the filtered water enters the purifying cavity after being filtered by the filter material in the left filtering area 12, the purified water is conveyed outwards through the valve seven 27, the valve thirteen 29 is opened later, the filter material is pressed into the upper scrubbing barrel 21 under the action of water pressure, the filter material is washed under the action of a medicament such as a cleaning agent, a sterilizing agent and the like, the sewage is discharged from the upper scrubbing barrel 21 through the valve thirteen 24 and the valve IV 32, and the filter material is cleaned by the valve III is opened, and the filter material is cleaned by the valve III is discharged from the scrubbing barrel 21, and the filter material is cleaned by the valve III is cleaned by the cleaning agent, and the valve III is opened, and the filter material is cleaned by the valve III is cleaned by the cleaning agent 12.
Example IV
The present embodiment is obtained by combining the first embodiment, the second embodiment, and the third embodiment.
When the oil-containing wastewater treatment device is used, in order to ensure that the treated water quality index is qualified, the left filtering first area, the middle pre-treatment area and the right filtering second area are matched to work simultaneously, the treatment time of wastewater can be prolonged, the filtering steps are increased, the treatment effect on the oil-containing wastewater is improved by multistage filtering, when the water quantity of the oil-containing wastewater is large, the middle pre-treatment area, the left filtering first area and the right filtering second area are matched to work in parallel, the emergency treatment of the sudden increase of the front-end wastewater can be realized, and when the filter element 9 on any side needs to be replaced, the filter element 9 on the other side continuously works, the continuous treatment of the oil-containing wastewater is ensured, the condition that the whole filtering tank is stopped and cleaned can not occur, the shutdown cost is reduced, and the treatment efficiency of the oil-containing wastewater is improved.
The above embodiments are only for illustrating the technical method of the present invention and not for limiting the same, and it should be understood by those skilled in the art that the technical method of the present invention may be modified or substituted without departing from the spirit and scope of the technical method of the present invention.
Claims (6)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202510413860.6A CN119912129B (en) | 2025-04-03 | 2025-04-03 | Coalescing filter tank for oily wastewater treatment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202510413860.6A CN119912129B (en) | 2025-04-03 | 2025-04-03 | Coalescing filter tank for oily wastewater treatment |
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| CN119912129A CN119912129A (en) | 2025-05-02 |
| CN119912129B true CN119912129B (en) | 2025-07-11 |
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| CN201684488U (en) * | 2010-03-29 | 2010-12-29 | 山东海吉雅环保设备有限公司 | Efficient oil-sludge-water separation and continuous stream filtering integrated water purifying device |
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| CN104176840A (en) * | 2013-05-22 | 2014-12-03 | 中国人民解放军总后勤部油料研究所 | Mobile oil-containing sewage treatment device |
| CN115477358A (en) * | 2022-08-05 | 2022-12-16 | 中国石油化工股份有限公司 | Secondary separation device, multistage separator, separation system and separation method for oily sewage |
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| US5603825A (en) * | 1994-07-18 | 1997-02-18 | Costinel; Paul | Multi-stage apparatus for separating immiscible fluids |
| CN102603032A (en) * | 2012-04-03 | 2012-07-25 | 韶关学院 | Waste oil separation device |
| CN204932991U (en) * | 2015-09-01 | 2016-01-06 | 温州周泰阀门管件有限公司 | A kind of duplex strainer |
| CN210214866U (en) * | 2019-05-16 | 2020-03-31 | 陕西海默油田服务有限公司 | Solid-liquid separation device for wastewater treatment |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201684488U (en) * | 2010-03-29 | 2010-12-29 | 山东海吉雅环保设备有限公司 | Efficient oil-sludge-water separation and continuous stream filtering integrated water purifying device |
| CN104176840A (en) * | 2013-05-22 | 2014-12-03 | 中国人民解放军总后勤部油料研究所 | Mobile oil-containing sewage treatment device |
| CN203379652U (en) * | 2013-06-19 | 2014-01-08 | 新疆石油勘察设计研究院（有限公司） | Pressure type continuous-flow filter |
| CN115477358A (en) * | 2022-08-05 | 2022-12-16 | 中国石油化工股份有限公司 | Secondary separation device, multistage separator, separation system and separation method for oily sewage |
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