CN207708652U - A kind of coal-to-olefin stripping condensed water oil removing system - Google Patents
A kind of coal-to-olefin stripping condensed water oil removing system Download PDFInfo
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- CN207708652U CN207708652U CN201721668801.0U CN201721668801U CN207708652U CN 207708652 U CN207708652 U CN 207708652U CN 201721668801 U CN201721668801 U CN 201721668801U CN 207708652 U CN207708652 U CN 207708652U
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- tunica fibrosa
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Abstract
The utility model is related to a kind of oily-water seperating equipments, and condensed water oil removing system is stripped more particularly, to a kind of coal-to-olefin.Coal-to-olefin strips condensed water oil removing system, include the pretreatment filters being connected with coal-to-olefin condensed water, super hydrophilic oleophobic membrane separator and tunica fibrosa oil water separator, tunica fibrosa oil water separator includes level-one tunica fibrosa oil water separator and secondary fiber film oil water separator, the water outlet of pretreatment filters is connected with the water inlet of super hydrophilic oleophobic membrane separator, the water outlet of super hydrophilic oleophobic membrane separator is connected to the water inlet of level-one tunica fibrosa oil water separator, the water outlet of level-one tunica fibrosa oil water separator is connected with the water inlet of secondary fiber film water-oil separating, super hydrophilic oleophobic membrane separator top, the top of level-one tunica fibrosa oil water separator and secondary fiber film oil water separator is both provided with oil discharge outlet, oil discharge outlet is connected with light oil buffer tank.There is the utility model anti-pollution to block up the advantageous effects such as performance is good, water-oil separating is efficient.
Description
Technical field
The utility model is related to a kind of oily-water seperating equipments, more particularly, to a kind of coal-to-olefin stripping condensed water oil removing system
System.
Background technology
In recent years, using coal through methanol come preparing low-carbon olefins（MTO technologies）Have become New Coal Chemical Industry
One of core.As more and more MTO factories put into commercial operation, also exposing some during long-cycle production asks
Topic.Such as through stripper treated condensed water, will continue to back in reactor by technological process requirement, with make full use of can
Methanol, dimethyl ether and the other oxygenatedchemicals that can not reacted completely.But in actual production, device is driven a period of time
Afterwards, it is detected in condensed water in addition to containing soluble alcohol, ether and ketone, also contains a certain amount of aromatic hydrocarbons analog derivative（Oils object
Matter）, condensed water is made to show the serious emulsification state for being mingled with oil slick.This kind of condensed water containing certain oily substance is entering
After reactor, methanol charging distributor pipe can be caused to block, and then reactor pressure is caused to increase, be reacted to entire MTO
The problem of system causes conversion ratio to reduce.It commonly uses currently on the market plus the method for demulsifier is not particularly suited for MTO technologies.Because of place
Condensed water after reason can be used as one of reaction raw materials to enter in reactor, such as using the method for adding demulsifier, then mean to be demulsified
Agent can also enter in reactor, and certain influence will certainly be brought therefore at present for MTO catalyst and chemical reaction
Factory, the oil removing in condensed water in the urgent need to address and demulsification problem.In conclusion needing a kind of pure physical treatment side at present
Formula, water-oil separating precision is high, and the dirt for capableing of anti-stick viscous crude, mink cell focus, oily solids is blocked up, cost-effective, and can adapt to coal system
Alkene condensed water complexity, it can the process that uses of industrially scalable and device.
Utility model content
The utility model provides a kind of anti-pollution and blocks up that performance is good, and water-oil separating is efficient, use primarily directed to the above problem
The mode of pure physics realizes the quick separating of oil slick in water, dispersed oil, oil emulsion, and realizes the coal-to-olefin of the recycling of oil
Strip condensed water oil removing system.
The purpose of this utility model is mainly to be achieved by following proposal：A kind of coal-to-olefin stripping condensed water is removed
Oil system includes the pretreatment filters being connected with coal-to-olefin condensed water, super hydrophilic oleophobic membrane separator and tunica fibrosa oil
Separator, tunica fibrosa oil water separator include level-one tunica fibrosa oil water separator and secondary fiber film oil water separator, pre- place
The water outlet of reason filter is connected with the water inlet of super hydrophilic oleophobic membrane separator, and the water outlet of super hydrophilic oleophobic membrane separator connects
It is connected on the water inlet of level-one tunica fibrosa oil water separator, water outlet and the secondary fiber film grease of level-one tunica fibrosa oil water separator
The water inlet of separation is connected, super hydrophilic oleophobic membrane separator top, level-one tunica fibrosa oil water separator and secondary fiber film grease
The top of separator is both provided with oil discharge outlet, and oil discharge outlet is connected with light oil buffer tank, and super hydrophilic oleophobic membrane separator interior is set
It is equipped with super hydrophilic oleophobic membrane, super hydrophilic oleophobic membrane includes positioning tube, the metal membrane material that is set on positioning tube and is coated in metal
Super hydrophilic oleophobic material layer in membrane material, the upper end of the pretreatment filters is provided with row's dross mouth, lower end is provided with row
Dirty mouth.Processing including three phases, first stage are that solid particulate matter and mechanical admixture pre-filtering are handled, and second stage is viscous
The removal processing of viscous crude, mink cell focus and subtle oily solids, phase III are high-precision demulsification and water-oil separating processing, the stage
Multistage tunica fibrosa oil water separator series connection can be used, be as follows：
1）Condensed water is delivered to pretreatment filters after elevator pump pressurizes（1）Import, by pretreatment filters
Afterwards, the big solid particle and mechanical admixture in water is removed
2）Water outlet enters super hydrophilic oleophobic membrane separator after filtering（2）, in this device, interception largely easily causes dirty stifled
Toughening oil, mink cell focus and its with fine particle formed oily solids.
3）Super hydrophilic oleophobic membrane separator water outlet enters level-one tunica fibrosa oil water separator（3）, remove the dispersed oil in water removal
And fine particulates.
4）By level-one fiber membrane separator（3）Treated, and water enters secondary fiber film oil water separator（4）, to concentration
It is remaining in water to be difficult to handle oil emulsion and carry out demulsification and separating treatment, finally realize high-precision oil removing.
It mainly solves the problems, such as current MTO condensed waters physical oil-removing, solves what thick substances dirt in MTO condensed waters was blocked up
Problem solves the problems, such as that oil emulsion is demulsified in MTO condensed waters.It is widely applicable, can adapt to containing sticky heavy oil, oily solids,
The MTO condensed water complexity water quality that oil emulsion coexists.The process and backwash process of water-oil separating are all made of the method realization of physics, nothing
Secondary pollution detaches fuel-displaced quality height, does not change the fundamental property of synthetic water, be conducive to follow-up environmental protection treatment.Operating cost
It is low, do not add any medicament, operating pressure is in 0.1 ~ 0.3MPa, low pressure operation, and securely and reliably, low energy consumption and easy to operate is easy to
Industrialization and automation.Equipment of the super hydrophilic oleophobic membrane separator as special disposal toughening oil and subtle oily solids, has
High-precision interdiction capability and very strong oil resistant adhesiveness ability are demulsified the stage for subsequent oil emulsion, provide the stifled guarantor of anti-pollution
Barrier, reduces follow-up load, ensure that the long-term operation of oil removing system.Super hydrophilic oleophobic membrane separator interior is provided with super hydrophilic
Oleophobic membrane, super hydrophilic oleophobic membrane includes positioning tube, the metal membrane material that is set on positioning tube and coated in super in metal membrane material
Hydrophilic oleophobic material layer, positioning tube outer surface are arranged at intervals with annular spacing groove, and metal membrane material is in reticular structure and is fitted in calmly
Position cylinder outer surface, annular spacing groove can limit metal membrane material, and metal membrane material is avoided to slide axially with positioning tube, ensure metal
Membrane material is wrapped in always on the outside of positioning tube.Super hydrophilic oleophobic membrane can improve filter efficiency, and convenient for the replacement of metal membrane material
And repair.
Preferably, super hydrophilic oleophobic membrane separator top, level-one tunica fibrosa oil water separator and the secondary fiber
Backwash import is both provided on film oil water separator, backwash import is connected with compressed gas source or water source with pressure, super hydrophilic to dredge
The bottom on oil film separator top, level-one tunica fibrosa oil water separator and secondary fiber film oil water separator is both provided with backwash row
Dirty mouth.Backwash import connects compressed gas source or water source with pressure, and driving backwash water is in reverse to filter core operating status filter cartridge flushing, backwash
Water is discharged through sewage draining exit, and the bottom of equipment can be arranged reserved vapor interface, and preparation is that viscosity is higher or cleaning point when congealing serious
It is heated from the water in device equipment.
Preferably, the pretreatment filters are internally provided with metal composite net, metal composite net be less than or equal to
Four layers, filtering accuracy is less than or equal to 25 microns.
Preferably, the super hydrophilic oleophobic membrane separator interior is provided with super hydrophilic oleophobic membrane, super hydrophilic oleophobic membrane
Including metal membrane material and coated in the super hydrophilic oleophobic material layer in metal membrane material.Super hydrophilic oleophobic membrane is using corrosion-resistant high-precision
As basic membrane material, surface coats super hydrophilic oleophobic material and the nethike embrane that manufactures for the stainless steel mesh of degree.Nethike embrane filtering accuracy is small
In 25 microns.Basic membrane material is not limited only to stainless steel material.The filter core for adhering to one layer of super hydrophilic oleophobic membrane with several surfaces, is adopted
With outside into it is interior go out water intake mode, toughening oil or mink cell focus are intercepted in the outside of super hydrophilic oleophobic membrane filter, and can not be adhered to
In film surface, it is easy to backwash recovery, will not causes dirty stifled.
Preferably, the level-one tunica fibrosa oil water separator is identical with the structure of secondary fiber film oil water separator,
Include tank body, inlet water divider, go out water separator and column water-oil separating filter core, inlet water divider with to go out water separator solid
Due in tank body, inlet water divider is located above water separator, and the tank wall is equipped with inlet and outlet.Using pure
Physical separation can enter the oil in oily wastewater, especially oil emulsion removal, recycling, oily wastewater into moisture water from water inlet
Device, inlet water divider introduce oily wastewater in columnar water separation filter core, and oil emulsion is detached with columnar water on filter core in water body
After tunica fibrosa contact, in the case where fiber film material is microcosmic and surface characteristic acts on, oil emulsion is gradually demulsified, and forms tiny oil droplets,
When tiny oil droplets penetrate tunica fibrosa, it is gradually gathered into more larger oil droplet, after larger oil droplet is detached from tunica fibrosa, is floated under the effect of gravity
Or separation of sinking, to realize that water-oil separating, the light oil oil discharge outlet discharge of the light oil through top of the tank at top are collected, the weight of bottom
Oily then heavy oil oil discharge outlet discharge through tank base is collected, and the light oil and heavy oil water content of collection are very low, can be used as finished product pin
It sells or reprocesses, economic benefit can be generated again while reaching environmentally friendly purpose, and the water at middle part then enters water separator warp
Water outlet discharge carries out subsequent processing again after carrying out, and filter core can be detached to columnar water by backwash air inlet using compressed air
Backwash is carried out, property is blocked up to ensure to run long periodicity and resistant.The utility model is simple in structure, and floor space is small, low pressure fortune
Row, securely and reliably, easy to operate, operating cost is low, applied widely, and durability against pollution is strong, and service life is long, can effectively remove simultaneously
Oil emulsion is recycled, significant economic benefit can be generated again while reaching environmentally friendly purpose.
Therefore, a kind of coal-to-olefin stripping condensed water oil removing system of the utility model has following advantages：Water-oil separating
Process and the backwash process method that is all made of physics realize that non-secondary pollution, it is high to detach fuel-displaced quality, does not change synthetic water
Fundamental property, be conducive to follow-up environmental protection treatment.Operating cost is low, does not add any medicament, operating pressure in 0.1 ~ 0.3MPa,
Low pressure operation, securely and reliably, low energy consumption and it is easy to operate be easy to industrialize and automate.Super hydrophilic oleophobic membrane separator is as special
The equipment of door processing toughening oil and subtle oily solids, has high-precision interdiction capability and very strong oil resistant adhesiveness ability,
It is demulsified the stage for subsequent oil emulsion, provides the stifled guarantee of anti-pollution, reduce follow-up load, ensure that the long period fortune of oil removing system
Row.
Description of the drawings
Attached drawing 1 is a kind of structural schematic diagram of the utility model；
Attached drawing 2 is the structural schematic diagram of level-one tunica fibrosa oil water separator in the utility model；
Attached drawing 3 is the structural schematic diagram of super hydrophilic oleophobic membrane in the utility model.
It illustrates：1- pretreatment filters, the super hydrophilic oleophobic membrane separators of 2-, 3- level-one tunica fibrosa oil water separators,
4- secondary fiber film oil water separators, 5- tank bodies, 6- inlet water dividers, 7- go out water separator, 8- column water-oil separating filter cores, 9-
Water inlet, 10- water outlets, 11- backwash imports, 12- backwash sewage draining exits, 13- positioning tubes, 14- metal membrane materials.
Specific implementation mode
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment 1：As shown in Figure 1, 2, a kind of coal-to-olefin strips condensed water oil removing system, which is characterized in that including with
Pretreatment filters 1, super hydrophilic oleophobic membrane separator 2 and the tunica fibrosa oil water separator that coal-to-olefin condensed water is connected, it is fine
Dimension film oil water separator includes level-one tunica fibrosa oil water separator 3 and secondary fiber film oil water separator 4, pretreatment filters
Water outlet is connected with the water inlet of super hydrophilic oleophobic membrane separator, and the water outlet of super hydrophilic oleophobic membrane separator is connected to level-one fibre
Tie up the water inlet of film oil water separator, the water inlet of the water outlet and secondary fiber film water-oil separating of level-one tunica fibrosa oil water separator
Mouthful be connected, super hydrophilic oleophobic membrane separator top, level-one tunica fibrosa oil water separator and secondary fiber film oil water separator top
End is both provided with oil discharge outlet, and oil discharge outlet is connected with light oil buffer tank.As shown in figure 3, super hydrophilic oleophobic membrane separator interior is set
It is equipped with super hydrophilic oleophobic membrane, super hydrophilic oleophobic membrane includes positioning tube 13, the metal membrane material 14 that is set on positioning tube and is coated in
Super hydrophilic oleophobic material layer in metal membrane material.The upper end of pretreatment filters is provided with row's dross mouth, lower end is provided with blowdown
Mouthful.It is respectively provided on super hydrophilic oleophobic membrane separator top, level-one tunica fibrosa oil water separator and secondary fiber film oil water separator
There are backwash import 11, backwash import to be connected with compressed gas source or water source with pressure, super hydrophilic oleophobic membrane separator top, level-one
The bottom of tunica fibrosa oil water separator and secondary fiber film oil water separator is both provided with backwash sewage draining exit 12.Pretreatment filters
It is internally provided with metal composite net, metal composite net is less than or equal to four layers, and filtering accuracy is less than or equal to 25 microns.It is super hydrophilic to dredge
Oil film separator interior is provided with super hydrophilic oleophobic membrane, and super hydrophilic oleophobic membrane includes metal membrane material and coated in metal membrane material
Super hydrophilic oleophobic material layer.Level-one tunica fibrosa oil water separator is identical with the structure of secondary fiber film oil water separator, includes
Tank body 5, inlet water divider 6 go out water separator 7 and column water-oil separating filter core 8, inlet water divider and to go out water separator fixed
In in tank body, inlet water divider is located above water separator, and the tank wall is equipped with water inlet 9 and water outlet 10.
Processing including three phases, first stage are that solid particulate matter and mechanical admixture pre-filtering are handled, second stage
For the removal processing of toughening oil, mink cell focus and subtle oily solids, the phase III is demulsified for high-precision and water-oil separating processing, should
Multistage tunica fibrosa oil water separator series connection can be used in stage, is as follows：
1）Condensed water is delivered to pretreatment filters after elevator pump pressurizes（1）Import, by pretreatment filters
Afterwards, the big solid particle and mechanical admixture in water is removed
2）Water outlet enters super hydrophilic oleophobic membrane separator after filtering（2）, in this device, interception largely easily causes dirty stifled
Toughening oil, mink cell focus and its with fine particle formed oily solids.
3）Super hydrophilic oleophobic membrane separator water outlet enters level-one tunica fibrosa oil water separator（3）, remove the dispersed oil in water removal
And fine particulates.
4）By level-one fiber membrane separator（3）Treated, and water enters secondary fiber film oil water separator（4）, to concentration
It is remaining in water to be difficult to handle oil emulsion and carry out demulsification and separating treatment, finally realize high-precision oil removing.
It mainly solves the problems, such as current MTO condensed waters physical oil-removing, solves what thick substances dirt in MTO condensed waters was blocked up
Problem solves the problems, such as that oil emulsion is demulsified in MTO condensed waters.It is widely applicable, can adapt to containing sticky heavy oil, oily solids,
The MTO condensed water complexity water quality that oil emulsion coexists.The process and backwash process of water-oil separating are all made of the method realization of physics, nothing
Secondary pollution detaches fuel-displaced quality height, does not change the fundamental property of synthetic water, be conducive to follow-up environmental protection treatment.Operating cost
It is low, do not add any medicament, operating pressure is in 0.1 ~ 0.3MPa, low pressure operation, and securely and reliably, low energy consumption and easy to operate is easy to
Industrialization and automation.Equipment of the super hydrophilic oleophobic membrane separator as special disposal toughening oil and subtle oily solids, has
High-precision interdiction capability and very strong oil resistant adhesiveness ability are demulsified the stage for subsequent oil emulsion, provide the stifled guarantor of anti-pollution
Barrier, reduces follow-up load, ensure that the long-term operation of oil removing system.Backwash import connects compressed gas source or water source with pressure, drives
Dynamic backwash water is in reverse to filter core operating status filter cartridge flushing, and backwash water is discharged through sewage draining exit, and reserved steaming can be arranged in the bottom of equipment
Vapour interface, preparation are that viscosity is higher or water when congealing serious in cleaning separator equipment is heated.Super hydrophilic oleophobic membrane is
Using corrosion-resistant high-precision stainless steel mesh as basic membrane material, surface coats super hydrophilic oleophobic material and the nethike embrane that manufactures.
Nethike embrane filtering accuracy is less than 25 microns.Basic membrane material is not limited only to stainless steel material.It is super hydrophilic with one layer of several surfaces attachment
The filter core of oleophobic membrane, using outside into it is interior go out water intake mode, toughening oil or mink cell focus are intercepted in super hydrophilic oleophobic membrane filter
Outside, and it can not be adhered to film surface, it is easy to backwash recovery, will not causes dirty stifled.It can be by oily wastewater using pure physical separation
In oil, especially oil emulsion removal, recycling, oily wastewater enter inlet water divider from water inlet, and inlet water divider is by oil-containing
Sewage introduces in columnar water separation filter core, and oil emulsion and columnar water detach after the tunica fibrosa on filter core contacts in water body, in fiber
Under the microcosmic effect with surface characteristic of membrane material, oil emulsion is gradually demulsified, and forms tiny oil droplets, tunica fibrosa is penetrated in tiny oil droplets
When, it is gradually gathered into more larger oil droplet, after larger oil droplet is detached from tunica fibrosa, floats under the effect of gravity or sinks to detaching, to real
Light oil oil discharge outlet discharge of the light oil through top of the tank of existing water-oil separating, top is collected, and the heavy oil of bottom is then through tank base
The discharge of heavy oil oil discharge outlet is collected, and the light oil and heavy oil water content of collection are very low, can be used as sale of finished goods or reprocessing, reached
It can generate economic benefit while environmentally friendly purpose again, and the water at middle part then enters water separator after water outlet discharge carries out again
Subsequent processing is carried out, can detach filter core to columnar water by backwash air inlet using compressed air carries out backwash, to ensure
It runs long periodicity and resistant blocks up property.The utility model is simple in structure, and floor space is small, low pressure operation, securely and reliably, operation letter
Single, operating cost is low, applied widely, and durability against pollution is strong, and service life is long, can effectively remove and recycle oil emulsion, is reaching
Significant economic benefit can be generated while environmentally friendly purpose again.
It should be understood that the embodiment is merely to illustrate the utility model rather than limitation the scope of the utility model.In addition
It should be understood that after reading the content taught by the present invention, those skilled in the art can make the utility model various
Change or modification, these equivalent forms also fall within the scope of the appended claims of the present application.
Claims (4)
1. a kind of coal-to-olefin strips condensed water oil removing system, which is characterized in that include being connected with coal-to-olefin condensed water
Pretreatment filters, super hydrophilic oleophobic membrane separator and tunica fibrosa oil water separator, tunica fibrosa oil water separator include level-one fibre
Tie up film oil water separator and secondary fiber film oil water separator, the water outlet of pretreatment filters and super hydrophilic oleophobic membrane separator
Water inlet be connected, the water outlet of super hydrophilic oleophobic membrane separator is connected to the water inlet of level-one tunica fibrosa oil water separator, one
The water outlet of grade tunica fibrosa oil water separator is connected with the water inlet of secondary fiber film water-oil separating, super hydrophilic oleophobic membrane separator
The top on top, level-one tunica fibrosa oil water separator and secondary fiber film oil water separator is both provided with oil discharge outlet, and oil discharge outlet is equal
It is connected with light oil buffer tank, super hydrophilic oleophobic membrane separator interior is provided with super hydrophilic oleophobic membrane, and super hydrophilic oleophobic membrane includes fixed
Position cylinder, the metal membrane material that is set on positioning tube and coated in the super hydrophilic oleophobic material layer in metal membrane material, the pre- place
The upper end of reason filter is provided with row's dross mouth, lower end is provided with sewage draining exit.
2. a kind of coal-to-olefin according to claim 1 strips condensed water oil removing system, which is characterized in that the super parent
Be both provided on water oleophobic membrane separator top, level-one tunica fibrosa oil water separator and secondary fiber film oil water separator backwash into
Mouthful, backwash import is connected with compressed gas source or water source with pressure, super hydrophilic oleophobic membrane separator top, level-one tunica fibrosa grease
The bottom of separator and secondary fiber film oil water separator is both provided with backwash sewage draining exit.
3. a kind of coal-to-olefin according to claim 1 or 2 strips condensed water oil removing system, which is characterized in that described
Pretreatment filters are internally provided with metal composite net, and metal composite net is less than or equal to four layers, and filtering accuracy is less than or equal to 25
Micron.
4. a kind of coal-to-olefin according to claim 1 or 2 strips condensed water oil removing system, which is characterized in that described
Level-one tunica fibrosa oil water separator is identical with the structure of secondary fiber film oil water separator, includes tank body, inlet water divider, goes out
Water separator and column water-oil separating filter core, inlet water divider and go out water separator and are both secured in tank body, inlet water divider position
In going out above water separator, the tank wall is equipped with inlet and outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721668801.0U CN207708652U (en) | 2017-12-04 | 2017-12-04 | A kind of coal-to-olefin stripping condensed water oil removing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721668801.0U CN207708652U (en) | 2017-12-04 | 2017-12-04 | A kind of coal-to-olefin stripping condensed water oil removing system |
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| Publication Number | Publication Date |
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| CN207708652U true CN207708652U (en) | 2018-08-10 |
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ID=63059320
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| CN201721668801.0U Active CN207708652U (en) | 2017-12-04 | 2017-12-04 | A kind of coal-to-olefin stripping condensed water oil removing system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110002624A (en) * | 2019-05-07 | 2019-07-12 | 天津渤海石化有限公司 | A kind of dehydrogenating propane waste water treatment system and method |
| CN110028129A (en) * | 2019-05-11 | 2019-07-19 | 江苏瑞尔丽新材料科技有限公司 | A kind of automation oily waste water treatment filter core |
-
2017
- 2017-12-04 CN CN201721668801.0U patent/CN207708652U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110002624A (en) * | 2019-05-07 | 2019-07-12 | 天津渤海石化有限公司 | A kind of dehydrogenating propane waste water treatment system and method |
| CN110028129A (en) * | 2019-05-11 | 2019-07-19 | 江苏瑞尔丽新材料科技有限公司 | A kind of automation oily waste water treatment filter core |
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Inventor after: Du Guoliang Inventor after: Ye Zhen Inventor after: Liu Qian Inventor after: Zhong Shanyun Inventor after: Xue Huifu Inventor after: Liu Lei Inventor after: Ma Xingmei Inventor after: Wang Xiaoming Inventor before: Ye Zhen Inventor before: Zhong Shanyun |