CN109354118B - Oil-water separation device and method based on density difference - Google Patents
Oil-water separation device and method based on density difference Download PDFInfo
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- CN109354118B CN109354118B CN201811505305.2A CN201811505305A CN109354118B CN 109354118 B CN109354118 B CN 109354118B CN 201811505305 A CN201811505305 A CN 201811505305A CN 109354118 B CN109354118 B CN 109354118B
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/0208—Separation of non-miscible liquids by sedimentation
- B01D17/0214—Separation of non-miscible liquids by sedimentation with removal of one of the phases
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Abstract
The invention discloses an oil-water separation device based on density difference, which comprises an oil storage tank, a water supplementing mechanism, an oil drainage groove and a plurality of gates, wherein the oil drainage groove is sequentially arranged in the oil drainage groove along the extension direction of the oil drainage groove and is divided into a plurality of mutually independent oil-water separation chambers; each gate all contains flashboard and last flashboard down, and last flashboard reciprocates and then communicates or separates two adjacent oil-water separation rooms relatively lower flashboard, and the height of the closed joint of flashboard and last flashboard increases along draining groove extending direction gradually under each, and the bottom of each oil-water separation room all is equipped with the bleeder valve. The invention also discloses an oil-water separation method adopting the separation device. The invention adopts a multi-stage gate form, so that the whole device can be quickly adapted to sewage with different oil contents, the increase of water replenishing quantity or water draining quantity caused by overhigh or overlow liquid level of oil-water layering is avoided, the power consumption of a water pump is reduced, the energy saving performance of the device is improved, and the flexibility of the device is enhanced.
Description
Technical Field
The invention relates to the field of oil-water separation, in particular to an oil-water separation device based on density difference and a method thereof
Background
In recent years, with the rapid development of the urban industry, the sewage discharge amount of each industry is increased rapidly, and a large amount of sewage is directly discharged into an urban sewer network. The sewage has high-concentration industrial oil, suspended matters and various residues, and if the sewage is not treated or is not treated completely, the sewage is directly discharged, so that the load of a municipal sewage treatment plant can be increased, the water passing capacity of a municipal drainage pipe network is influenced, even the sewage is blocked, and after the sewage is discharged into the water, the eutrophication of the water can be caused, and the environment and the human health are threatened.
In order to solve the above-mentioned problems, people are continuously dedicated to the research of oil-water separation. The separation methods of oil-water mixed liquid can be classified into 4 types: physical methods, chemical methods, physicochemical methods, and biochemical methods. The physical methods are separation methods using differences in physical properties such as density, conductivity, and acoustic velocity of each phase, and mainly include gravity settling, centrifugal cyclone, high-voltage static electricity, high-frequency pulse, microwave radiation, and ultrasonic wave. The chemical method is that a proper amount of chemical agents (demulsifier, coalescence agent and the like) are added into the oil-water mixed solution to destroy the interface stability of the oil-water emulsion and convert the emulsified state between oil and water into a free state, thereby realizing the interphase separation of the oil-water mixed solution. The physical and chemical method combines physical separation method and chemical separation method to separate oil from water. The biochemical method is to use a biological demulsifier composed of microbial cells to destroy the stable state of the oil-water emulsion, so as to realize the dehydration of the oil-water mixed liquid. Each dehydration method has its own characteristics and applicable conditions. Therefore, the oil-water separation method is selected by comprehensively considering the properties of crude oil, the water content, the emulsification properties and degree of oil and water, the dispersion degree and stability of emulsion and the like.
In the catering industry, the coating industry, the surface engineering industry and the petrochemical industry, the water content in the discharged oil-water mixed liquid is generally more than 70 percent, and the discharged oil-water mixed liquid is a typical oil-in-water mixed liquid. In engineering, gravity settling, chemical separation, centrifugal separation, gravity inertia, thin oil blending and the combination of different methods are often used for the oil-water mixture to realize oil-water separation. Among them, the gravity settling method is widely used because of its advantages of no need of external power, no consumption of chemicals, no secondary pollution, low operation and maintenance cost, high economy, etc. The gravity settling method is a method for realizing a multiphase separation process mainly by depending on different gravity forces among multiphase media. The main working part is a gravity separator, when a multi-phase medium enters the separator, the density is different, so that the gravity difference is generated, and then a heavy phase with higher density is settled under the action of gravity, so that the heavy phase is separated out from a light phase with lower density, and the multi-phase separation task is completed. The gravity separator, which is common in the industry, mainly comprises: horizontal (or vertical) oil removal tanks, inclined plate oil separation tanks, coarse grain (coalescence) oil removal tanks and the like. However, the common gravity separator has the disadvantages of large particle size of trapped oil drops, low treatment efficiency, large occupied area, high power consumption of a water replenishing mechanism and the like, so that it is a necessary task to optimize and improve the structure of the gravity separator so as to improve the oil-water separation effect.
Disclosure of Invention
The present application is directed to solving at least one of the problems in the prior art. Therefore, one of the objectives of the present invention is to provide an oil-water separation device based on density difference and a method thereof, so as to solve the problem of high power consumption of a water replenishing mechanism due to increased water replenishing amount caused by too low liquid level of an oil-water separation layer in the existing gravity separator.
In order to solve the technical problems, the invention adopts the following technical scheme:
an oil-water separation device based on density difference, comprising:
the bottom of the oil storage tank is provided with a drain valve;
the water replenishing mechanism is used for replenishing water to the oil storage tank so as to adjust the height of an oil-water interface;
further comprising:
the oil drainage groove is communicated with the upper side part of the oil storage tank;
the plurality of gates are sequentially arranged in the oil drainage groove along the extension direction of the oil drainage groove so as to divide the oil drainage groove into a plurality of mutually independent oil-water separation chambers;
each the gate all contains flashboard and last flashboard down, it can be relative to go up the flashboard down the flashboard reciprocates and then communicates or separate two adjacent oil-water separation rooms, each the height of the closed joint of flashboard and last flashboard increases gradually along draining groove extending direction down, each the bottom of oil-water separation room all is equipped with the bleeder valve.
Further, each gate is vertically arranged in the oil drainage groove.
Furthermore, a slot matched with each gate is arranged in the oil drainage groove.
Furthermore, a pull ring is arranged on the gate.
Furthermore, the whole oil drainage groove is formed by welding steel plates.
Further, moisturizing mechanism is the suction pump through pipeline and oil storage tank bottom water inlet intercommunication, be equipped with check valve and manometer on the pipeline.
Further, the oil storage tank is vertical oil storage tank, the draining groove sets up vertical oil storage tank right side and top and vertical oil storage tank top parallel and level.
Furthermore, the joint of the oil drainage groove and the vertical oil storage tank adopts circular arc transition with the same outer diameter as the vertical oil storage tank.
Furthermore, the top of the vertical oil storage tank and the top of the oil drainage groove are both provided with openable top covers.
An oil-water separation method, which adopts the oil-water separation device based on density difference, comprises the following steps:
s1; placing the oil-water mixed solution to be separated into the oil storage tank for standing and precipitating;
s2; slightly opening an upper gate plate of a gate with a closing seam at the lowest position, observing whether oil flows out from the oil drainage groove, if the oil flows out, indicating that an oil-water interface is below the closing seam of the gate, starting a water supplementing mechanism to inject external water into an oil-water separation chamber, rising a layered liquid level, stopping supplementing water until water flows out from the oil drainage groove, and enabling the oil flowing out from the gate to flow out from a corresponding oil drainage valve; if the water flows out, the oil-water interface is above the closing joint of the gate, at the moment, the gate plate is fully opened, the upper gate plate of the gate with the closing joint at the second low position is slightly opened, whether the oil leakage groove flows out is oil is observed, if the oil flows out, the water supplementing mechanism is opened in the same way until the water in the oil leakage groove flows out is observed, the water supplementing mechanism stops supplementing water, the oil flowing out from the gate flows out from the corresponding oil leakage valve, and the rest gates are regulated in the same way as the above until the oil is discharged from the oil leakage groove to realize oil-water separation;
s3; after oil-water separation, the drain valve and the oil drain valve are opened to drain the water without oil.
Compared with the prior art, the invention has the beneficial effects that:
1. the multi-stage gate is adopted, so that the whole device can be quickly adapted to sewage with different oil contents, the increase of water replenishing quantity or water draining quantity caused by overhigh or overlow oil-water layered liquid level is avoided, the power consumption of a water pump is reduced, the energy conservation of the device is improved, and the flexibility of the device is enhanced.
2. The whole body is formed by welding thick steel plates, so that the processing and the production are convenient, the reliability is high, and the service life is long.
3. Through the mode of pull ring and flashboard control, make things convenient for the circulation of oil water mixed liquid and end.
Drawings
FIG. 1 is a front cross-sectional view of the present invention;
FIG. 2 is a left side view of the present invention;
FIG. 3 is a top view of the present invention;
FIG. 4 is a schematic view of the gate and tab welding of the present invention;
FIG. 5 is a schematic flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, an oil-water separation device based on density difference includes an oil storage tank 1, an oil drainage groove 2, a plurality of gates 3, 4, 5 and a water replenishing mechanism. The bottom of the oil storage tank 1 is provided with a drain valve 6, the water supplementing mechanism is communicated with the oil storage tank 1 to supplement water to the oil storage tank 1 so as to adjust the height of an oil-water interface of oil-water mixed liquid in the tank body, and water after oil-water separation is discharged from the drain valve 3. The oil drainage groove 2 is communicated with the upper side part of the oil storage tank 1, and a plurality of gates 3, 4 and 5 are sequentially arranged in the oil drainage groove 2 along the extension direction of the oil drainage groove 2, so that the oil drainage groove 2 is divided into a plurality of mutually independent oil-water separation chambers 7, 8 and 9; each gate 3, 4, 5 all contains flashboard 10 and last flashboard 11 down, and last flashboard 11 can reciprocate relatively lower flashboard 10 and then communicate or separate two adjacent oil-water separation rooms, and the height of each lower flashboard 10 and the closed seam of last flashboard 11 increases along draining groove 2 extending direction gradually, and the bottom of each oil-water separation room 7, 8, 9 all is equipped with bleeder valve 20. In this embodiment, the oil storage tank 1 is preferably a vertical oil storage tank, and the spill valve 20 is preferably a throttle valve.
In this embodiment, the number of the gates is three, and the gates are respectively named as a first-stage gate 3, a second-stage gate 4, and a third-stage gate 5, and the corresponding oil-water separation chambers are respectively named as a first oil-water separation chamber 7, a second oil-water separation chamber 8, and a third oil-water separation chamber 9. The height of the closed seam 19 of the first-level gate 3, the second-level gate 4 and the third-level gate 5 is gradually increased, and the height ratio of the upper and lower gate plates of each-level gate is respectively 3: 1. 1: 1 and 1: 3. the oil drainage groove 2 is arranged on the right side of the vertical oil storage tank 1, the top of the oil drainage groove is flush with the top of the vertical oil storage tank 1, and the height of the oil drainage groove 2 is 1/2 of the vertical oil storage tank. The oil drainage groove 2 is arc-shaped with the 1 link of vertical oil storage tank, and the angle of circular arc is 15, and the radius equals with 1 external diameter of vertical oil storage tank, welds on 1 right side of vertical oil storage tank, and the low-angle guarantees that the oil water layering liquid level can not move down hardly when pulling open flashboards at all levels. The third oil-water separation chamber 9 at the tail end of the oil drainage groove is divided into two independent chambers by an integral four-stage gate 12, and an oil drainage valve 20 is arranged in each chamber.
In practical application, for the convenience of carrying out oil-water separation operation, all be equipped with the top cap that can open and close (not shown in the figure) at the top of vertical oil storage tank 1 and draining groove 2, observe the oil-water separation condition through opening the top cap, can cover the top cap at ordinary times in order to prevent to fall into dust debris in the draining groove 2, vertical oil storage tank 1 is hollow cylinder type, is equipped with the mixed liquid of oil and water import on the vertical oil storage tank top cap.
Specifically, moisturizing mechanism is a suction pump 13 with outside water source intercommunication, and the bottom of oil storage tank 1 is equipped with the water inlet, and suction pump 12 passes through pipeline and water inlet intercommunication, installation back check valve 14 and manometer 15 on the pipeline, and check valve 14 should be close to oil storage tank 1 as far as possible, and with 1 interval of oil storage tank no longer than 10cm, the booth apart from can preventing that the pipeline from appearing blockking up.
It should be noted that, in actual design, vertical oil storage tank 1 and draining groove 2 all can adopt 8 ~ 10mm thick steel plate to make through the welding mode, and the equal vertical setting of each gate is in draining groove 2, sets up in the slot 16 of each gate adaptation in draining groove 2, can also set up the pull ring on gate 3, 4, 5, realizes opening and close of gate through pull ring pulling flashboard, can make things convenient for the circulation and the end of water oil mixture.
Specifically, the pull rings are divided into an upper flashboard pull ring 17 and a lower flashboard pull ring 18, the upper flashboard pull ring 17 is welded on the upper end surface of the upper flashboard 11 of each stage of the gate, the lower flashboard pull ring 18 is welded on the left and right end surfaces of the lower flashboard 10 at each stage in the middle through the pull rods, and the opening and closing of the flashboards are controlled by pulling the pull rings.
Referring to fig. 5, the oil-water separation process using the oil-water separation device based on density difference according to the present embodiment is as follows:
after the oil-water mixed solution is poured into the vertical oil storage tank 1, the mixed solution is controlled in the vertical oil storage tank 1 due to the blocking of the first-stage gate 3, standing is carried out for a period of time, and the oil and the water can be layered and exist in a layered liquid level due to the fact that the oil and the water are not mutually soluble and the specific gravity of the water is larger than that of the oil;
firstly slightly opening an upper flashboard of a primary gate 3, observing whether oil flows out from an oil drainage groove 2, if so, indicating that a layered liquid level is below an interface of the upper flashboard and a lower flashboard of the primary gate 3, opening a check valve 14 at the moment, starting a water suction pump 13 to send external water into an oil storage tank 1, rising the layered liquid level, preventing a mixed liquid from flowing backwards by the check valve 14, observing pressure by a pressure gauge 15, closing the pump when water flows out from the oil drainage groove 2, pulling a pull ring of the upper flashboard of the primary gate 3 to open the upper flashboard, discharging the oil on the upper layer through the gate by the oil drainage groove 2 and an oil drainage valve 20, blocking the water on the lower layer in the vertical oil storage tank 1 by the lower flashboard, and finally discharging the oil through a drain valve 6 at the bottom to realize oil-water separation;
if the oil is not oil, the layered liquid level is above the interface of the upper gate plate and the lower gate plate of the primary gate 3, the primary gate plate is fully opened at the moment, the upper gate plate of the secondary gate 4 is slightly opened, whether the oil flows out of the oil drainage groove 2 is oil or not is observed, if the oil flows out, the water pump 13 is started in the same way until the water flows out of the oil drainage groove 2 is observed, and the subsequent separation method is similar to the oil-water separation mode of the primary gate 3; if the oil is not oil, the secondary gate 4 is fully opened, the upper flashboard of the tertiary gate 5 is slightly opened, whether the oil outflow from the oil drainage groove 2 is oil or not is observed again, if the oil outflow is oil, the water pumping is started until the water outflow from the oil drainage groove is observed, and the subsequent separation method is similar to the oil-water separation mode of the primary gate. If the oil is not oil, the layered liquid level is above the interface of the upper and lower gate plates of the three-level gate 5, at this time, the bottom drain valve 6 is opened to let the lower layer water flow out slowly, the valve is closed until the oil outflow in the oil drainage groove 2 is observed, then the four-level gate is opened to let the upper layer oil flow out from the oil drainage groove 2, and meanwhile, the oil drainage valves 20 at all levels are opened to remove the oil or water left at all levels during the observation time lag. And finally, opening the drain valve 6 to allow the water on the lower layer to flow out of the drain valve 6, thereby realizing oil-water separation.
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (9)
1. An oil-water separation method is characterized in that an oil-water separation device based on density difference comprises an oil storage tank, and the bottom of the oil-water separation device is provided with a drain valve;
the water replenishing mechanism is used for replenishing water to the oil storage tank so as to adjust the height of an oil-water interface;
it is characterized by also comprising:
the oil drainage groove is communicated with the upper side part of the oil storage tank;
the plurality of gates are sequentially arranged in the oil drainage groove along the extension direction of the oil drainage groove so as to divide the oil drainage groove into a plurality of mutually independent oil-water separation chambers;
each gate all contains lower flashboard and last flashboard, go up the flashboard can relatively lower flashboard reciprocates and then communicates or separate two adjacent oil-water separation rooms, each the height of the closed joint of lower flashboard and last flashboard increases along draining groove extending direction gradually, each the bottom of oil-water separation room all is equipped with the bleeder valve, and the method includes following step:
s1; placing the oil-water mixed solution to be separated into the oil storage tank for standing and precipitating;
s2; slightly opening an upper gate plate of a gate with a closing seam at the lowest position, observing whether oil flows out from the oil drainage groove, if the oil flows out, indicating that an oil-water interface is below the closing seam of the gate, starting a water supplementing mechanism to inject external water into an oil-water separation chamber, rising a layered liquid level, stopping supplementing water until water flows out from the oil drainage groove, and enabling the oil flowing out from the gate to flow out from a corresponding oil drainage valve; if the water flows out, the oil-water interface is above the closing joint of the gate, at the moment, the gate plate is fully opened, the upper gate plate of the gate with the closing joint at the second low position is slightly opened, whether the oil leakage groove flows out is oil is observed, if the oil flows out, the water supplementing mechanism is opened in the same way until the water in the oil leakage groove flows out is observed, the water supplementing mechanism stops supplementing water, the oil flowing out from the gate flows out from the corresponding oil leakage valve, and the rest gates are regulated in the same way as the above until the oil is discharged from the oil leakage groove to realize oil-water separation;
s3; after oil-water separation, the drain valve and the oil drain valve are opened to drain the water without oil.
2. The oil-water separation method according to claim 1, characterized in that: each gate is vertically arranged in the oil drainage groove.
3. The oil-water separation method according to claim 1, characterized in that: and the oil drainage groove is internally provided with a slot matched with each gate.
4. The oil-water separation method according to claim 1, characterized in that: and a pull ring is arranged on the gate.
5. The oil-water separation method according to claim 1, characterized in that: the whole oil drainage groove is formed by welding steel plates.
6. The oil-water separation method according to any one of claims 1 to 5, characterized in that: the water replenishing mechanism is a water suction pump communicated with a water inlet in the bottom of the oil storage tank through a pipeline, and a check valve and a pressure gauge are arranged on the pipeline.
7. The oil-water separation method according to claim 6, characterized in that: the oil storage tank is a vertical oil storage tank, and the oil drainage groove is arranged on the right side of the vertical oil storage tank, and the top of the oil drainage groove is flush with the top of the vertical oil storage tank.
8. The oil-water separation method according to claim 7, characterized in that: and the joint of the oil drainage groove and the vertical oil storage tank adopts circular arc transition equal to the outer diameter of the vertical oil storage tank.
9. The oil-water separation method according to claim 7, characterized in that: and the top parts of the vertical oil storage tank and the oil drainage groove are respectively provided with a top cover which can be opened and closed.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104973700A (en) * | 2015-06-15 | 2015-10-14 | 李秀林 | Eco-friendly swill oil recovery device |
| CN205527859U (en) * | 2016-03-01 | 2016-08-31 | 江阴华西化工码头有限公司 | Oil -water separating device |
| CN107902720A (en) * | 2017-11-30 | 2018-04-13 | 石梅芳 | A kind of categorised collection processing of oily wastewater recycles equipment |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104973700A (en) * | 2015-06-15 | 2015-10-14 | 李秀林 | Eco-friendly swill oil recovery device |
| CN205527859U (en) * | 2016-03-01 | 2016-08-31 | 江阴华西化工码头有限公司 | Oil -water separating device |
| CN107902720A (en) * | 2017-11-30 | 2018-04-13 | 石梅芳 | A kind of categorised collection processing of oily wastewater recycles equipment |
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