Demulsification oil-water separation system and method

Abstract

The present invention provides a demulsified oil-water separation system and method, the demulsified oil-water separation method comprising the following steps: (A1) oily wastewater enters a demulsified tank from a liquid inlet pipe; (A2) wastewater is demulsified in the demulsified tank and oil and water are separated, and the oil floating on the liquid surface passes over the overflow port and enters the oil-water separation tank; (A3) the oil entering the oil-water separation tank is absorbed by an oil absorption unit, and water flows downward over the oil absorption unit; (A4) the oil absorption unit is pushed into a collecting tank, the oil absorption unit is squeezed, and the oil is separated from the oil absorption unit and enters the collecting tank. The present invention has the advantages of high separation efficiency, low cost, and long service life.

Description

Technical Field

[0001] The invention relates to liquid separation, and in particular to a demulsified oil-water analysis system and method. Background Art

[0002] Industrial oily wastewater contains oils, surfactants, organic additives and other organic substances that are harmful to the environment, so it must not be discharged without treatment. Industrial oily wastewater can be recycled after oil-water separation or discharged after treatment to meet the standards, which are both environmentally friendly measures for treating industrial oily wastewater. Machining cutting fluid is a metalworking fluid used for cooling and lubricating metals during cutting, chipping, grinding and other processing. It has many types and complex ingredients, usually including base oil, emulsifier, rust inhibitor, etc. Cutting fluid has the functions of cooling, lubricating, cleaning and rust prevention in the processing of metals and their alloys. The waste cutting fluid used in the machining process often has problems such as stray oil, particles, and odor.

[0003] Other common industrial oily wastewaters include mold release agent waste liquid. In die-casting production, a large amount of mold release agent will be sprayed onto the mold. Some of the mold release agent evaporates at high temperature, some is absorbed on the mold and consumed, and most of it flows directly under the mold after one-time use, becoming oily waste liquid. Another example is cleaning agent wastewater. Cleaning agents are mainly used for degreasing and cleaning of various metal processing parts in the electroplating industry, cleaning of stubborn heavy oil stains on the surface of mechanical equipment and machine tools, degreasing and cleaning in the automotive industry, etc., to ensure the normal use of parts, prevent environmental pollution and subsequent contamination of parts. The oily wastewater generated after cleaning the workpiece has the characteristics of complex composition, large fluctuations in water quality, poor emission rules, difficult biodegradation, and chronic toxicity to animals, plants and humans.

[0004] The purification and reuse of cutting fluids, release agents and degreasing agents can save production and processing costs on the one hand, and reduce the discharge of hazardous wastes on the other hand, and achieve green and clean production. The main purpose of purification and reuse treatment is to remove the mixed oil, particulate matter and breeding microorganisms. Common oil-water separation methods include physical separation and chemical separation. The physical method is to remove the oil mixed in the water by the density difference between oil and water or adsorption and filtration. The main methods include heating separation, filtration separation, flotation separation, ultrafiltration membrane separation, reverse osmosis separation, coalescence separation and centrifugal separation. The main method of chemical separation is to achieve demulsification through demulsifiers. Since the addition of agents will affect the composition of the treated liquid and increase the difficulty of separation, it is generally not used.

[0005] Several common oil-water separation methods

[0006]

[0007] In the oil-water separation process, the separated oil is generally removed by overflow. In order to avoid the waste liquid from overflowing with the oil, the liquid level of the oil-water separator is generally manually adjusted through a U-shaped tube. When the U-shaped tube is lowered, the water inside the oil-water separator is discharged from the U-shaped tube at the bottom of the pool. The liquid level in the oil-water separator is low, and the upper floating oil cannot overflow to the oil drain pipe; when the U-shaped tube liquid level is raised, the liquid level inside the oil-water separator rises, and the upper floating oil overflows into the oil drain pipe to achieve oil-water separation. After the oil-water separation is completed, the U-shaped tube liquid level is manually lowered, and the liquid inside the oil-water separator is discharged from the bottom of the oil-water separator through the U-shaped tube, completing an oil discharge operation. (In fact, it is the principle of a communicating vessel). At present, there is also a steel belt deoiler, which can carry the oil in the oil-water separator out through a steel belt, and then scrape it off through the scraper on the steel belt deoiler.

[0008] Industrial oily wastewater has the characteristics of high dispersion stability, complex chemical composition, high pollutant concentration, and great difficulty in treatment. The heating separation method uses steam or heating equipment to break the emulsion. The equipment is simple and the investment is low, but the oil removal effect is poor and the energy consumption is high. Gravity or flotation separation is based on the different densities or buoyancy of oil and water. The method is simple and the oil removal effect is stable, but it takes a long time. Coagulation separation uses coarse granular materials to increase the aggregation of oil dispersed in the water until the buoyancy is greater than the adhesion and floats up. The equipment is simple and the investment is low. The use cycle of the coalescence material is long, but it is necessary to select different coalescence fillers according to different oily waste liquids, which greatly reduces the adaptability of the method. The use of hollow fiber membranes The selective permeability principle has good oil-water separation effect, but it will also remove some effective ingredients, with high cost, large investment, complex equipment and difficult operation; filtration separation generally uses lipophilic materials to adsorb oil in the solution, the effluent water quality is good, the equipment is miniaturized and easy to operate, but the equipment investment is high and the filter media and filter bags are difficult to regenerate; the centrifugal separation method uses the centrifugal force generated by rapid rotation to make the dense water flow to the outside along a circular path, and the light oil is thrown to the inner circle and gathers to form large oil droplets that float up and separate, but daily maintenance is difficult and may damage the effective ingredients of the liquid to be treated.

[0009] At present, some common oil-water separation equipment on the market, in addition to removing the miscellaneous oil, also needs to add filtering and sterilization modules. As the number of treatment pools increases, the equipment becomes larger and larger, which is not conducive to the transportation and mobile treatment of the device. In addition. When removing the miscellaneous oil, the U-tube liquid level is manually adjusted. The equipment needs to be on duty when it is running, so that the oil can be removed from the oil-water separator in time, but it is time-consuming and laborious. Due to the manual judgment and adjustment of the oil-water separator liquid level, the discharged oil carries more or less waste liquid. Although the steel belt deoiler can achieve automatic oil removal, the steel belt deoiler has poor oil removal effect and low treatment efficiency. At the same time, the discharged oil also carries too much treatment waste liquid. Summary of the invention

[0010] In order to solve the deficiencies in the above-mentioned prior art solutions, the present invention provides a demulsified oil-water separation method with low processing cost and high oil-water separation efficiency.

[0011] The objective of the present invention is achieved through the following technical solutions:

[0012] A demulsification oil-water separation method, the demulsification oil-water separation method comprising the following steps:

[0013] (A1) Oily wastewater enters the demulsification tank from the liquid inlet pipe;

[0014] (A2) the wastewater is demulsified in the demulsification tank to separate oil and water, and the oil floating on the liquid surface flows over the overflow port into the oil-water separation tank;

[0015] (A3) The oil entering the oil-water separation tank is absorbed by the oil absorption unit, and the water flows downward over the oil absorption unit;

[0016] (A4) Push the oil suction unit into the collecting tank, squeeze the oil suction unit, and the oil will be separated from the oil suction unit and enter the collecting tank.

[0017] The present invention also aims to provide a demulsified oil-water separation system with high oil-water separation efficiency, low cost and long service life. The present invention aims to be achieved through the following technical solutions:

[0018] Demulsification oil-water separation system, the demulsification oil-water analysis system comprises a liquid inlet pipe, a demulsification tank and an oil-water separation tank; the demulsification oil-water separation system also comprises:

[0019] An overflow port, the overflow port being arranged between the demulsification tank and the oil-water separation tank;

[0020] An oil suction unit, the oil suction unit is arranged in the oil-water separation tank and is located at the lower side of the overflow port;

[0021] a frame, on which the oil suction unit is arranged;

[0022] a first guide rail, the first guide rail being arranged in the oil-water separation tank and extending to the collection tank; the frame being arranged on the first guide rail and moving along the guide rail;

[0023] A driving unit, wherein the driving unit drives the moving member;

[0024] A moving part, wherein the moving part squeezes the oil suction unit;

[0025] A collecting tank is provided with an oil discharge port and is isolated from the oil-water separation tank.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. High oil-water separation efficiency;

[0028] First, demulsification technology is used to achieve oil-water separation; second, the oil mixed with a small amount of water overflowing after demulsification is absorbed by the oil absorption unit, and the water flows over the oil absorption unit and gathers; in addition, a small amount of oil in the gathered water floats up, and the oil layer that rises with the liquid level finally contacts the oil absorption unit, thus achieving better oil-water separation;

[0029] Optionally, a bubble generating device is provided in the oil-water separation tank, and the bubbles carry the oil droplets upward, further improving the oil-water separation effect;

[0030] Optionally, a packing layer is provided at the lower part of the oil absorption unit in the oil-water separation tank, so that the small oil droplets floating upward gather the medium and large oil droplets and float upward, further improving the oil-water separation effect;

[0031] 2. Low cost and long service life;

[0032] After the oil absorption unit is saturated with oil, it is pushed into the collection tank, the absorption unit is squeezed, and the separated oil is collected. The oil absorption unit can be used repeatedly like a sponge, which reduces the operating cost and prolongs the service life;

[0033] 3. Multiple functions;

[0034] The parallel use of the first pipe with a larger inner diameter and the second pipe with a smaller inner diameter effectively adjusts the flow rate entering the demulsification tank; when a small flow rate enters, the liquid level in the demulsification tank rises slowly, and the oil floating on the upper layer of the liquid slowly passes through the overflow port, preventing excessive water from overflowing into the oil-water separation tank with the oil, thereby ensuring the oil-water separation efficiency;

[0035] The overflow flow rate is adjusted by using a rotating plate;

[0036] The oil squeezing and oil collecting mode adjustment is realized by adjusting the top position of the connecting pipe outside the oil-water separation tank up and down. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The disclosure of the present invention will become easier to understand with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only used to illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention. In the drawings:

[0038] Figure 1 is a flow chart of a demulsified oil-water separation method according to an embodiment of the present invention;

[0039] Figure 2 1 is a simplified structural diagram of a demulsified oil-water separation system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] Figure 1-2The following description describes the optional embodiments of the present invention to teach those skilled in the art how to implement and reproduce the present invention. In order to teach the technical solution of the present invention, some conventional aspects have been simplified or omitted. It should be understood by those skilled in the art that variations or substitutions derived from these embodiments will be within the scope of the present invention. It should be understood by those skilled in the art that the following features can be combined in various ways to form multiple variations of the present invention. Thus, the present invention is not limited to the following optional embodiments, but is only limited by the claims and their equivalents.

[0041] Embodiment 1:

[0042] Figure 1 The structural diagram of the demulsified oil-water separation method according to the embodiment of the present invention is schematically shown as follows: Figure 1 As shown, the demulsified oil-water separation method comprises the following steps:

[0043] (A1) Oily wastewater enters the demulsification tank from the liquid inlet pipe;

[0044] (A2) the wastewater is demulsified in the demulsification tank to separate the oil and water, such as by heating, and the oil floating on the liquid surface flows over the overflow port into the oil-water separation tank;

[0045] (A3) The oil entering the oil-water separation tank is absorbed by the oil absorption unit, and the water flows downward over the oil absorption unit;

[0046] (A4) Push the oil suction unit into the collecting tank, squeeze the oil suction unit, and the oil will be separated from the oil suction unit and enter the collecting tank.

[0047] In order to adjust the flow rate of the liquid passing through the overflow port, further, in step (A2), the amount of liquid entering the oil-water separation tank is regulated by adjusting the inclination angle of the rotating plate at the overflow port.

[0048] In order to overflow the upper layer oil in the demulsification tank into the oil-water separation tank, further, as in step (A1), the wastewater enters the demulsification tank through the first pipeline (larger flow);

[0049] In step (A2), after demulsification, the first pipeline is closed, and the wastewater enters the demulsification tank through the second pipeline (with a smaller flow rate), the oil level in the upper layer rises, and enters the oil-water separation tank through the overflow port; the inner diameter of the second pipeline is smaller than the inner diameter of the first pipeline.

[0050] In order to adjust the oil-water separation tank to the oil suction mode, further, in step (A3), the top height of the portion of the connecting pipe connecting the inside and outside of the oil-water separation tank, which is outside the oil-water separation tank, is increased so that the top height is higher than the liquid level in the oil-water separation tank, and the rising liquid level in the oil-water separation tank contacts the oil suction unit.

[0051] In order to adjust the oil-water separation tank to the drainage mode, further, in step (A4), the top height of the portion of the connecting pipe connecting the inside and outside of the oil-water separation tank, which is outside the oil-water separation tank, is lowered so that the top height is lower than the liquid level in the oil-water separation tank, and the lower layer of liquid in the oil-water separation tank is discharged.

[0052] Figure 2 The structural diagram of the demulsified oil-water separation system of the embodiment of the present invention is schematically shown as follows: Figure 2 As shown, the demulsified oil-water analysis system includes

[0053] Liquid inlet pipe, demulsifier tank 21 and oil-water separation tank 22; these components are prior art in this field, and the specific structure and working mode are not described here;

[0054] An overflow port 41, wherein the overflow port 41 is disposed between the demulsification tank 21 and the oil-water separation tank 22;

[0055] An oil absorption unit 36, such as an oil absorption sponge, is disposed in the oil-water separation tank 22 and is located below the overflow port 41;

[0056] a frame, on which the oil suction unit is arranged;

[0057] a first guide rail, the first guide rail being arranged in the oil-water separation tank and extending to the collection tank; the frame being arranged on the first guide rail and moving along the guide rail;

[0058] A driving unit, wherein the driving unit drives the moving member;

[0059] A moving part, wherein the moving part squeezes the oil suction unit so that the oil absorbed by the oil suction unit is separated and discharged;

[0060] A collecting tank is provided with an oil discharge port and is isolated from the oil-water separation tank.

[0061] In order to push and squeeze the oil absorption unit, the demulsified oil-water separation system further includes:

[0062] The adapter plate is connected to the movable member, and the adapter plate pushes the oil suction unit as the movable member moves.

[0063] For regular movement, the demulsified oil-water separation system further includes:

[0064] A second guide rail, wherein the second guide rail is arranged on the frame, and the adapter plate is arranged on the second guide rail and moves along the second guide rail.

[0065] In order to adjust the flow rate of the liquid passing through the overflow port, the demulsified oil-water separation system further includes:

[0066] The rotating plate 35 is rotatably disposed at the overflow port 41 , and the flow rate of the liquid passing through the overflow port 41 is adjusted by adjusting the angle of the rotating plate 35 relative to the horizontal plane.

[0067] In order to adjust the working mode of the oil-water separation tank, the demulsified oil-water separation system further includes:

[0068] A connecting pipe 34 , one end of which is connected to the lower part of the oil-water separation tank 22 , and the other end of which is outside the oil-water separation tank 22 , and the top position of the other end is adjustable up and down.

[0069] In order to prevent the oil suction unit from excessively protruding in a direction perpendicular to the moving direction, further, the oil suction unit is clamped between the first part and the second part of the frame.

[0070] In order to promote the floating of a small amount of oil in the water below the oil absorption unit in the oil-water separation tank, a packing layer 32 is further provided at the lower part of the oil absorption unit so that small oil droplets passing through the packing layer 32 are aggregated into large oil droplets, thereby improving the oil-water separation efficiency.

[0071] In order to adjust the flow rate of wastewater entering the demulsification tank, further, the liquid inlet pipe includes a first pipe 11 with a larger inner diameter and a second pipe 15 with a smaller inner diameter connected in parallel. When liquid is introduced into the demulsification tank 21, only the first pipe 11 is opened (or the first pipe and the second pipe are opened together); after demulsification is completed in the demulsification tank 21, only a smaller flow rate of wastewater is introduced into the demulsification tank 21 through the second pipe 15, and the liquid level in the demulsification tank 21 slowly rises, so that the upper layer of oil slowly enters the oil-water separation tank 22 through the overflow port 41, thereby preventing excessive water from entering the oil-water separation tank 22 along with the oil.

[0072] In order to speed up the oil-water separation efficiency in the liquid at the bottom of the oil-water separation tank, a bubble generating device 33 is further arranged at the bottom of the oil-water separation tank.

[0073] Embodiment 2:

[0074] Application examples of the demulsified oil-water separation system and method according to the embodiments of the present invention include oil-water separation in the treatment of cutting fluid, release agent, and degreasing tank fluid.

[0075] In this application example, Figure 2As shown, the liquid inlet pipe includes a first pipeline 11 with a larger inner diameter and a second pipeline 15 with a smaller inner diameter connected in parallel. Valves 12 and 14 are respectively provided on the first pipeline 11 and the second pipeline 15 to control the on-off of the flow path. The first pipeline 11 is also provided with a pump 13. The output ends of the first channel 11 and the second pipeline 15 are connected to the bottom of the demulsification tank.

[0076] In the demulsification tank 21: the heater 31 is arranged inside the demulsification tank 21, below the liquid surface; the upper part of the partition between the demulsification tank 21 and the oil-water separation tank 22 has an overflow port 41; a rotatable rotating plate 35 is arranged at the overflow port 41, and the angle between the rotating plate 35 and the horizontal plane is variable: the smaller the angle, the greater the flow rate through the overflow port 41;

[0077] In the oil-water separation tank: an oil absorption unit 36 ​​is arranged at the lower side of the overflow port 41 in the oil-water separation tank 22, and an oil absorption sponge is used in this application example; the oil absorption sponge is clamped between the first part and the second part of the frame, and oil and water can pass through the frame and the oil absorption sponge; the frame is arranged on a first guide rail, and the first guide rail extends from the oil-water separation tank to the collection tank; the adapter plate is vertically arranged between the first part and the second part, and the opposite two ends are arranged on the sub-second guide rail, so that the adapter plate moves forward or reversely along the second guide rail under the drive of the screw, squeezing or loosening the oil absorption sponge; the motor drives the screw, and the screw is connected to the adapter plate, thereby converting the rotation of the motor into the translation of the adapter plate; a packing layer 32 is arranged on the lower side of the second part, and ball rings are filled inside; a microbubble generating device 33 is arranged on the lower side of the packing layer; one end of the connecting pipe 34 is connected to the lower part of the oil-water separation tank 22, and the other end extends to the return liquid tank 23 outside the oil-water separation tank 22.

[0078] The demulsified oil-water separation method of this application example comprises the following steps:

[0079] (A1) The oily wastewater passes through the first pipe of the liquid inlet pipe and enters the demulsification tank from the bottom at a relatively large flow rate, and then the first pipe is closed;

[0080] (A2) The heater in the demulsification tank works to increase the temperature, and the wastewater is demulsified in the demulsification tank to separate the oil and water; the angle of the rotating plate relative to the horizontal plane is adjusted to zero; only the second pipeline is opened, and the oily wastewater enters the demulsification tank at a small flow rate, and the liquid level in the demulsification tank rises slowly, and the oil floating on the liquid surface and a small amount of water pass through the overflow port and enter the oil-water separation tank;

[0081] (A3) The oil entering the oil-water separation tank is absorbed by the oil absorption unit, and a small amount of water flows downward over the oil absorption unit, passes through the packing layer, and enters the bottom of the oil-water separation tank. The liquid level is lower than the oil absorption sponge, but higher than the packing layer;

[0082] The microbubbles generated by the microbubble generator rise in the oil-water separation tank, carrying a small amount of small oil droplets. After passing through the packing layer, the small oil droplets gather into large oil droplets and float on the liquid surface.

[0083] (A4) Raising the top position of the connecting pipe in the liquid return tank so that the top position is higher than the liquid level in the oil-water separation tank, and the liquid level in the oil-water separation tank gradually rises and finally contacts the oil absorption sponge, and the oil on the upper layer of the liquid surface contacts the oil absorption sponge and is absorbed;

[0084] Afterwards, the top position is lowered to be lower than the oil absorbing sponge, and the water at the bottom of the oil-water separation tank enters the liquid return tank through the connecting pipe, and the liquid level in the oil-water separation tank is lower than the oil absorbing sponge;

[0085] After that, the frame is pushed and the frame enters the collection tank along the first guide rail; the motor works and drives the screw to push the adapter plate in the positive direction, the oil-absorbing sponge between the first part and the second part is squeezed, and the oil separates from the oil-absorbing sponge and flows into the collection tank; then, the motor reverses, the adapter plate moves in the opposite direction along the second guide rail, and the oil-absorbing sponge returns to its original state.

[0086] Embodiment 3:

[0087] The application example of the demulsified oil-water separation system and method according to the embodiment of the present invention is different from the embodiment 2 in that:

[0088] The screw is no longer used, and a first pulley and a second pulley are respectively arranged on the side of the adapter plate facing the oil suction unit and the side facing away from the oil suction unit; one end of the first rope is fixed, and the other end is wound around the first pulley and then wound around the rotating shaft of the first motor; one end of the second rope is fixed, and the other end is wound around the second pulley and then wound around the rotating shaft of the second motor;

[0089] The above motor and rope work in the following way:

[0090] The second motor rotates forward, the length of the second rope between the second motor and the fixed point becomes shorter, and the second rope drags the adapter plate to move forward along the second guide rail to squeeze the oil suction unit; at this time, the first motor rotates reversely, and the first rope between the first motor and the fixed point becomes longer;

[0091] The first motor rotates forward, the length of the first rope between the first motor and the fixed point becomes shorter, the first rope drags the adapter plate to move in the opposite direction along the second guide rail, and the absorption unit returns to its original state; at this time, the second motor rotates reversely, and the second rope between the second motor and the fixed point becomes longer.

Claims

1. According to the demulsification oil-water separation method of the demulsification oil-water separation system, the demulsification oil-water separation system comprises a liquid inlet pipe, a demulsification tank and an oil-water separation tank; characterized in that: The demulsified oil-water separation system also includes: An overflow port, the overflow port being arranged between the demulsification tank and the oil-water separation tank; An oil suction unit, the oil suction unit is arranged in the oil-water separation tank and is located at the lower side of the overflow port; a frame, on which the oil suction unit is arranged; a first guide rail, the first guide rail being arranged in the oil-water separation tank and extending to the collection tank; the frame being arranged on the first guide rail and moving along the guide rail; A driving unit, wherein the driving unit drives the moving member; A moving part, wherein the moving part squeezes the oil suction unit; A collecting tank, the collecting tank having an oil discharge port and being isolated from the oil-water separation tank; An adapter plate, the moving member is connected to the adapter plate, and the adapter plate pushes the oil suction unit as the moving member moves; The demulsified oil-water separation method comprises the following steps: (A1) Oily wastewater enters the demulsification tank from the liquid inlet pipe; (A2) the wastewater is demulsified in the demulsification tank to separate oil and water, and the oil floating on the liquid surface flows over the overflow port into the oil-water separation tank; (A3) the oil entering the oil-water separation tank is absorbed by the oil absorption unit, and the water flows downward over the oil absorption unit; the top height of the portion of the connecting pipe connecting the inside and outside of the oil-water separation tank and located outside the oil-water separation tank is increased so that the top height is higher than the liquid level in the oil-water separation tank, and the rising liquid level in the oil-water separation tank contacts the oil absorption unit; (A4) Push the oil suction unit into the collecting tank, squeeze the oil suction unit, and the oil will be separated from the oil suction unit and enter the collecting tank; the moving moving part squeezes the oil suction unit, so that the oil absorbed by the oil suction unit is separated and discharged; the moving part is connected to the adapter plate, and the adapter plate pushes the oil suction unit as the moving part moves.

2. The demulsified oil-water separation method according to claim 1, characterized in that: In step (A2), the amount of liquid entering the oil-water separation tank is adjusted by adjusting the inclination angle of the rotating plate at the overflow port.

3. The demulsified oil-water separation method according to claim 1, characterized in that: In step (A1), wastewater enters the demulsification tank through a first pipe; In step (A2), after demulsification, the first pipeline is closed, and the wastewater enters the demulsification tank through the second pipeline, the oil level in the upper layer rises, and enters the oil-water separation tank through the overflow port; the inner diameter of the second pipeline is smaller than the inner diameter of the first pipeline.

4. The demulsified oil-water separation method according to claim 1, characterized in that: In step (A4), the top height of the portion of the connecting pipe connecting the inside and outside of the oil-water separation tank, which is outside the oil-water separation tank, is lowered so that the top height is lower than the liquid level in the oil-water separation tank, and the lower layer of liquid in the oil-water separation tank is discharged.

5. The demulsified oil-water separation method according to claim 1, characterized in that: The demulsified oil-water separation system also includes: A second guide rail, wherein the second guide rail is arranged on the frame, and the adapter plate is arranged on the second guide rail and moves along the second guide rail.

6. The demulsified oil-water separation method according to claim 1, characterized in that: The demulsified oil-water separation system also includes: A rotating plate is rotatably disposed at the overflow port.

7. The demulsified oil-water separation method according to claim 1, characterized in that: The demulsified oil-water separation system also includes: A connecting pipe, one end of which is connected to the lower part of the oil-water separation tank, and the other end of which is outside the oil-water separation tank, and the top position of the other end is adjustable up and down.

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