Oil-water separation device and control method

Abstract

The invention relates to the technical field of oil refining, in particular to an oil-water separation device and a control method, and the oil-water separation device comprises a tank body (1); a liquid separation tank (2) is arranged in the tank body (1); an oil collecting structure and a water collecting structure are respectively arranged on two sides of the liquid separating tank (2); the liquid separation tank can realize thorough separation of an oil phase and a water phase according to the density characteristics of the oil phase and the water phase, and the oil phase in the liquid separation tank overflows into the oil collection tank and is discharged from the device; a water phase in the liquid separation tank flows into the water collection tank and is discharged from the device; the oil-water separation operation is rapid and efficient, the separation effect is excellent, and the conditions that the oil-water phase separation is not clear and water is contained in the oil are effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of oil refining, and in particular to an oil-water separation device and a control method thereof. Background Art

[0002] The waste oil raw materials of the dehydration unit of the current production device are dehydrated by high-temperature distillation, and the top product is an oil-water mixture. After extraction, it needs to be allowed to stand and settle in a storage tank to separate the oil and water, and then the water is pumped out from the bottom into the sewage treatment station by a pump, and the upper oil layer is transferred to another storage tank by a pump; the existing oil-water separation devices are mostly horizontal storage tanks, and the oil-water mixture coming out of the dehydration device must stand for a period of time after condensation and entering the separation tank before the oil phase and the water phase can be naturally separated, and the wastewater coming out of the dehydration device is a dynamic impact process, which will cause the separation tank to be unable to stand and separate, and the required standing time is long, and the production efficiency is low; and it is easy to produce problems such as unclear oil and water phases and water in the oil.

[0003] After searching, the applicant found that the Chinese patent document with publication number 215798607U disclosed a microchannel oil-water separation chip and an oil-water separation system on February 11, 2022, wherein the microchannel oil-water separation chip includes a substrate and a cover plate, and the substrate has a recessed trough body, including a separation working groove and a feed groove, an oil phase discharge groove and a water phase discharge groove respectively connected to the separation working groove; the cover plate covers the opening side of the trough body of the substrate; a cylindrical array is provided in the separation working groove, and the cylindrical array includes a plurality of cylindrical platforms evenly distributed in the separation working groove, wherein the surface of the cylindrical platform close to the half of the oil phase discharge groove has an oleophilic coating, and the surface of the cylindrical platform close to the half of the water phase discharge groove has a hydrophilic coating; the device also cannot solve the above-mentioned technical problems.

[0004] Therefore, in order to improve or solve at least one of the above problems, it is necessary to optimize the existing oil-water separation device and control method. Summary of the invention

[0005] The object of the present invention is to provide an oil-water separation device and a control method which can realize rapid and efficient separation of oil and water in an oil refining device and have good separation effect.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: an oil-water separation device, comprising a tank body; a liquid separation tank is provided in the tank body; an oil collecting structure and a water collecting structure are respectively provided on both sides of the liquid separation tank.

[0007] The tank body is respectively connected with a dynamic separator and a high-level density meter; the dynamic separator and the high-level density meter are both arranged in the liquid separation tank.

[0008] The oil collecting structure comprises an oil collecting tank; a low-level density meter, an oil level meter and an oil pump are respectively connected to the tank body; the low-level density meter and the oil level meter are both arranged in the oil collecting tank; and the oil pump is connected to the oil collecting tank.

[0009] The water collection structure comprises a water collection tank; a water level gauge and a water pump are respectively connected to the tank body; the water level gauge is arranged in the water collection tank, and the water pump is connected to the water collection tank.

[0010] An oil separator is provided between the liquid separation tank and the oil collecting tank; a water separator is provided between the liquid separation tank and the water collecting tank; a water collecting pipe is provided on the water separator; and the water collecting pipe is communicated with the liquid separation tank and the water collecting tank respectively.

[0011] The water pump is communicated with the liquid separation tank and the oil collection tank respectively; the high-level density meter, the low-level density meter, the oil level meter, the water level meter, the oil pump and the water pump are all connected with a controller.

[0012] A control method for the oil-water separation device, the control method comprising the following steps:

[0013] 1) The oil-water mixture enters the liquid separation tank through the dynamic separator; the oil-water mixture is separated into a water phase and an oil phase;

[0014] 2) the oil phase overflows from the top of the oil separator into the oil collecting tank; the oil pump extracts the oil phase from the oil collecting tank;

[0015] 3) The water phase enters the water collecting tank through the water collecting pipe; the water pump extracts the water phase from the water collecting tank.

[0016] The step 2) comprises:

[0017] 21) When the density of the liquid in the oil collecting tank measured by the low-level density meter is less than or equal to 0.95 g / cm 3 When the oil level gauge measures the oil level to be higher than 60%, the oil level gauge sends a signal to the controller; the controller sends a control signal to the oil pump, and the oil pump is turned on; when the oil level gauge measures the oil level to be lower than 30%, the oil level gauge sends a signal to the controller; the controller sends a control signal to the oil pump, and the oil pump is turned off;

[0018] 22) When the density of the liquid in the oil collecting tank measured by the low-level density meter is greater than 0.95 g / cm 3 When the low-level density meter sends a signal to the controller; the controller sends control signals to the oil pump and the water pump respectively, the oil pump is turned off, and the water pump is turned on; the water pump extracts the water phase from the oil sump.

[0019] The step 3) comprises:

[0020] 31) When the high-level density meter measures the liquid density in the liquid separation tank to be greater than or equal to 0.9 g / cm 3 When the water level gauge measures a water level higher than 80%, the water level gauge sends a signal to the controller; the controller sends a control signal to the water pump, and the water pump is turned on; the water pump pumps the water out of the sump; when the water level gauge measures a water level lower than 60%, the water level gauge sends a signal to the controller; the controller sends a control signal to the water pump, and the water pump is turned off;

[0021] 32) When the high-level density meter measures the liquid density in the liquid separation tank to be less than 0.9 g / cm 3 When the water level is higher than 90%, the high-level density meter sends a signal to the controller; the controller sends a control signal to the water pump, and the water pump is turned off; the water level meter detects that the water level is higher than 90%, and the water level meter sends a signal to the controller; the controller sends a control signal to the water pump, and the water pump is turned on; the water pump pumps the water out of the sump.

[0022] In the step 2), the oil pump pumps the oil phase into the oil phase storage tank; in the step 3), the water pump pumps the water phase into the wastewater decontamination tank.

[0023] The beneficial effects of this application are:

[0024] 1. The oil-water separation device of the present application is provided with a controller, which includes a PIC module, which can receive signals from a low-level density meter, a high-level density meter, an oil level meter and a water level meter, and can control the opening and closing operations of the oil pump and the water pump, so as to realize the automatic separation of the oil phase and the water phase and output from the device; according to the density characteristics of the oil phase and the water phase, the two are completely separated, and the separation effect is excellent, which effectively avoids the situation that the oil and water phases are unclear and there is water in the oil; and the automated operation can save manpower, reduce labor intensity, and at the same time improve the speed of oil-water separation, effectively improving the efficiency of oil-water separation.

[0025] 2. A dynamic separator is installed on the tank body of the present application; the oil-water mixture (containing 10% oil and 90% water) from the dehydration unit is transported by a pump through a pipeline into the dynamic separator, and the oil-water mixture is drained to the middle and lower part of the liquid separation tank through the dynamic separator and slowly dispersed outside the receiver. At this time, the liquid level in the liquid separation tank begins to rise, basically close to a static state, the oil phase slowly floats up, and the water slowly settles at the bottom; there is no need to let the oil-water mixture stand for a long time, which greatly reduces the processing time and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein:

[0027] Figure 1 This is a structural schematic diagram of the oil-water separation device.

[0028] The marks in the above figure are:

[0029] The markings in the figure are:

[0030] 1. Tank body,

[0031] 2. Liquid separation tank, 201. Dynamic separator, 202. High-level density meter, 203. Oil separator,

[0032] 3. Oil collecting tank, 301. Low-level density meter, 302. Oil level meter, 303. Oil pump,

[0033] 4. Sump, 401. Water level gauge, 402. Pump, 403. Baffle,

[0034] 5. Water collecting pipe,

[0035] 6. Water phase, 601. Oil phase. DETAILED DESCRIPTION

[0036] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitating their implementation.

[0037] Figure 1 The oil-water separation device shown comprises a tank body 1; a liquid separation tank 2 is arranged in the tank body 1; and an oil collecting structure and a water collecting structure are respectively arranged on both sides of the liquid separation tank 2.

[0038] The liquid separation tank 2 can achieve complete separation of the oil phase 601 and the water phase 6 according to the density characteristics of the two. The oil phase 601 in the liquid separation tank 2 overflows into the oil collecting tank 3 and is discharged from the device; the water phase 6 in the liquid separation tank 2 flows into the water collecting tank 4 and is discharged from the device; the oil-water separation operation is fast and efficient, with excellent separation effect, which effectively avoids the situation where the oil and water phases are unclear and water is contained in the oil.

[0039] The tank body 1 is respectively connected with a dynamic separator 201 and a high-level density meter 202 ; the dynamic separator 201 and the high-level density meter 202 are both arranged in the liquid separation tank 2 .

[0040] The dynamic separator 201 is installed on the tank body 1, and the output end of the dynamic separator 201 extends into the liquid separation tank 2; the dehydration device of the oil refining device transports the oil-water mixture (containing 10% oil and 90% water) by a pump through a pipeline into the dynamic separator 201, and the oil-water mixture is drained to the middle and lower part of the liquid separation tank 2 through the dynamic separator 201 and slowly stratified. At this time, the liquid level in the liquid separation tank 2 begins to rise and is basically close to a static state. The oil phase 601 slowly floats up and the water phase 6 slowly settles at the bottom; the high-level density meter 202 is installed on the tank body 1 and extends into the liquid separation tank 2, and can detect the liquid density in the liquid separation tank 2.

[0041] The oil collecting structure includes an oil collecting tank 3; a low-level density meter 301, an oil level meter 302 and an oil pump 303 are respectively connected to the tank body 1; the low-level density meter 301 and the oil level meter 302 are both arranged in the oil collecting tank 3; and the oil pump 303 is connected to the oil collecting tank 3.

[0042] The low-level density meter 301 is installed on the tank body 1, and its detection end extends into the oil collecting tank 3, so as to detect the liquid density in the oil collecting tank 3; the oil level meter 302 is a magnetic flap oil level meter, which outputs a 4-20mA signal; the oil level meter 302 is installed on the side wall of the tank body 1 and is connected to the inside of the oil collecting tank 3, so as to detect the liquid level height in the oil collecting tank 3; the oil pump 303 is connected to the bottom of the tank body 1 and is connected to the oil collecting tank 3, so as to discharge the oil phase 601 stored in the oil collecting tank 3 out of the device.

[0043] The water collecting structure includes a water collecting tank 4 ; a water level gauge 401 and a water pump 402 are respectively connected to the tank body 1 ; the water level gauge 401 is arranged in the water collecting tank 4 , and the water pump 402 is connected to the water collecting tank 4 .

[0044] The water level meter 401 is a magnetic flap water level meter that outputs a 4-20mA signal; the water level meter 401 is installed on the side wall of the tank body 1 and is connected to the inside of the water collection tank 4, and can detect the water level in the water collection tank 4; the water pump 402 is connected to the bottom of the tank body 1 and is connected to the water collection tank 4, and can discharge the water phase 6 stored in the water collection tank 4 out of the device.

[0045] An oil separator 203 is provided between the liquid separation tank 2 and the oil collecting tank 3; a water separator 403 is provided between the liquid separation tank 2 and the water collecting tank 4; a water collecting pipe 5 is provided on the water separator 403; and the water collecting pipe 5 is connected to the liquid separation tank 2 and the water collecting tank 4 respectively.

[0046] The height of the oil separator 203 is 2.3 meters, and the height of the water separator 403 is 2.8 meters; the water collecting pipe 5 is an L-shaped structure; the water inlet of the water collecting pipe 5 is close to the bottom surface of the liquid separation tank 2; the discharge outlet of the water collecting pipe 5 is connected to the middle of the water separator 403, thereby realizing the connection between the liquid separation tank 2 and the water collecting tank 4; the density of the water phase 6 is greater than that of the oil phase 601, so that the water phase 6 is deposited at the bottom of the liquid separation tank 2 and enters the water collecting tank 4 through the water collecting pipe 5.

[0047] The water pump 402 is connected to the liquid separation tank 2 and the oil collection tank 3 respectively; the high-level density meter 202, the low-level density meter 301, the oil level meter 302, the water level meter 401, the oil pump 303 and the water pump 402 are all connected to a controller.

[0048] The water pump 402 is connected to the liquid separation tank 2, the oil collecting tank 3 and the water collecting tank 4 respectively; an interface is provided at the bottom of the tank body 1, and a control valve is connected between the water pump 402 and the interface; the controller can receive signals from the high-level density meter 202, the low-level density meter 301, the oil level meter 302, and the water level meter 401, and can control the start and stop of the oil pump 303 and the water pump 402; the controller is a PIC module.

[0049] A control method for an oil-water separation device, the control method comprising the following steps:

[0050] 1) The oil-water mixture enters the liquid separation tank 2 through the dynamic separator 201; the oil-water mixture is separated into a water phase 6 and an oil phase 601;

[0051] 2) The oil phase 601 overflows from the top of the oil separator 203 into the oil collecting tank 3; the oil pump 303 extracts the oil phase 601 from the oil collecting tank 3;

[0052] 3) The water phase 6 enters the water collecting tank 4 through the water collecting pipe 5; the water pump 402 pumps the water phase 6 out of the water collecting tank 4.

[0053] Step 1) can separate the oil-water mixture into water phase 6 and oil phase 601 quickly and efficiently; step 2) can separate the oil phase 601 into the oil collecting tank 3, and discharge the oil phase 601 from the device through the oil pump 303; step 3) can separate the water phase 6 into the water collecting tank 4, and discharge the water phase 601 from the device through the water pump 402.

[0054] Step 2) includes:

[0055] 21) When the low-level density meter 301 measures that the density of the liquid in the oil collecting tank 3 is less than or equal to 0.95 g / cm 3 When the oil level gauge 302 measures the oil level to be higher than 60%, the oil level gauge 302 sends a signal to the controller; the controller sends a control signal to the oil pump 303, and the oil pump 303 is turned on; when the oil level gauge 302 measures the oil level to be lower than 30%, the oil level gauge 302 sends a signal to the controller; the controller sends a control signal to the oil pump 303, and the oil pump 303 is turned off;

[0056] 22) When the low-level density meter 301 measures that the density of the liquid in the oil collecting tank 3 is greater than 0.95 g / cm 3When , the low-level density meter 301 sends a signal to the controller; the controller sends control signals to the oil pump 303 and the water pump 402 respectively, the oil pump 303 is turned off, and the water pump 402 is turned on; the water pump 402 extracts the water phase 6 from the oil collecting tank 3.

[0057] In step 21), the oil level meter 302 controls the oil pump 303 to pump oil by measuring the oil level, so that the oil phase 601 stored in the oil collecting tank 3 can be extracted in time; in step 22), the low-level density meter 301 measures that the liquid density in the oil collecting tank 3 is greater than 0.95 g / cm 3 When the water phase 6 is detected, the oil pump 303 is turned off to prevent the water phase 6 from being pumped out; the water pump 402 is turned on to pump out the small amount of water phase 6 deposited at the bottom of the oil collecting tank 3; the density of water is greater than 0.95 g / cm 3 .

[0058] Step 3) includes:

[0059] 31) When the high-level densitometer 202 measures that the density of the liquid in the liquid tank 2 is greater than or equal to 0.9 g / cm 3 When the water level gauge 401 measures a water level higher than 80%, the water level gauge 401 sends a signal to the controller; the controller sends a control signal to the water pump 402, and the water pump 402 is turned on; the water pump 402 pumps the water phase 6 out of the sump 4; when the water level gauge 401 detects a water level lower than 60%, the water level gauge 401 sends a signal to the controller; the controller sends a control signal to the water pump 402, and the water pump 402 is turned off;

[0060] 32) When the high-level densitometer 202 measures the density of the liquid in the liquid tank 2 to be less than 0.9 g / cm 3 When the water level is higher than 90%, the high-level density meter 202 sends a signal to the controller; the controller sends a control signal to the water pump 402, and the water pump 402 is turned off; the water level meter 401 detects that the water level is higher than 90%, and the water level meter 401 sends a signal to the controller; the controller sends a control signal to the water pump 402, and the water pump 402 is turned on; the water pump 402 extracts the water phase 6 from the sump 4.

[0061] In step 31), the water level meter 401 controls the pump 402 to pump water by measuring the water level, so as to realize the timely extraction of the water phase 6 stored in the sump 4; in step 32), when the high-level density meter 202 measures that the liquid density in the liquid trough 2 is less than 0.9 g / cm 3When the oil phase 601 is detected, due to the principle of communicating vessels, the liquid level heights in the liquid separation tank 2 and the water collection tank 4 are roughly the same. At this time, the pump 402 stops pumping water to prevent the liquid level in the water collection tank 4 from being too low. The oil phase 601 enters the water collection tank 4 through the water collection pipe 5 and is pumped out by the pump 402; when the water level gauge 401 detects that the water level in the water collection tank 4 is higher than 90%, due to the principle of communicating vessels, the liquid level in the liquid separation tank 2 is higher than the height of the oil separator 203, and the oil phase 601 in the upper part of the liquid separation tank 2 will automatically overflow into the oil collection tank 3; the density of oil is less than 0.9g / cm 3 .

[0062] In step 2), the oil pump 303 pumps the oil phase 601 into the oil phase storage tank; in step 3), the water pump 402 pumps the water phase 6 into the wastewater decontamination tank.

[0063] The oil phase 601 is discharged into the oil phase storage tank, and the water phase 6 is discharged into the wastewater decontamination pool; the reprocessing and recycling can meet the energy-saving and environmental protection requirements.

[0064] The specific workflow of the present invention is as follows:

[0065] 1) The oil-water mixture enters the liquid separation tank 2 through the dynamic separator 201; the oil-water mixture is separated into a water phase 6 and an oil phase 601;

[0066] 2) The oil phase 601 overflows from the top of the oil separator 203 into the oil collecting tank 3; the oil pump 303 extracts the oil phase 601 from the oil collecting tank 3;

[0067] 3) The water phase 6 enters the water collecting tank 4 through the water collecting pipe 5; the water pump 402 pumps the water phase 6 out of the water collecting tank 4.

[0068] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An oil-water separation device, characterized in that: It comprises a tank body (1); a liquid separation tank (2) is provided in the tank body (1); and an oil collection structure and a water collection structure are respectively provided on both sides of the liquid separation tank (2).

2. An oil-water separation device according to claim 1, characterized in that: The tank body (1) is respectively connected to a dynamic separator (201) and a high-level density meter (202); the dynamic separator (201) and the high-level density meter (202) are both arranged in the liquid separation tank (2).

3. An oil-water separation device according to claim 2, characterized in that: The oil collecting structure comprises an oil collecting tank (3); a low-level density meter (301), an oil level meter (302) and an oil pump (303) are respectively connected to the tank body (1); the low-level density meter (301) and the oil level meter (302) are both arranged in the oil collecting tank (3); and the oil pump (303) is connected to the oil collecting tank (3).

4. An oil-water separation device according to claim 3, characterized in that: The water collection structure comprises a water collection tank (4); a water level gauge (401) and a water pump (402) are respectively connected to the tank body (1); the water level gauge (401) is arranged in the water collection tank (4), and the water pump (402) is connected to the water collection tank (4).

5. An oil-water separation device according to claim 4, characterized in that: An oil separator (203) is provided between the liquid separation tank (2) and the oil collecting tank (3); a water separator (403) is provided between the liquid separation tank (2) and the water collecting tank (4); a water collecting pipe (5) is provided on the water separator (403); and the water collecting pipe (5) is respectively connected to the liquid separation tank (2) and the water collecting tank (4).

6. An oil-water separation device according to any one of claims 4 to 5, characterized in that: The water pump (402) is connected to the liquid separation tank (2) and the oil collection tank (3) respectively; the high-level density meter (202), the low-level density meter (301), the oil level meter (302), the water level meter (401), the oil pump (303) and the water pump (402) are all connected to a controller.

7. A control method for the oil-water separation device according to any one of claims 1 to 6, characterized in that: The control method comprises the following steps: 1) The oil-water mixture enters the liquid separation tank (2) through the dynamic separator (201); the oil-water mixture is separated into a water phase (6) and an oil phase (601); 2) the oil phase (601) overflows from the top of the oil separator (203) into the oil collecting tank (3); the oil pump (303) extracts the oil phase (601) from the oil collecting tank (3); 3) The water phase (6) enters the water collecting tank (4) through the water collecting pipe (5); the water pump (402) pumps the water phase (6) out of the water collecting tank (4).

8. The control method according to claim 7, characterized in that: The step 2) comprises: 21) When the density of the liquid in the oil collecting tank (3) measured by the low-level density meter (301) is less than or equal to 0.95 g / cm 3 When the oil level gauge (302) detects that the oil level is higher than 60%, the oil level gauge (302) sends a signal to the controller; the controller sends a control signal to the oil pump (303), and the oil pump (303) is turned on; when the oil level gauge (302) detects that the oil level is lower than 30%, the oil level gauge (302) sends a signal to the controller; the controller sends a control signal to the oil pump (303), and the oil pump (303) is turned off; 22) When the density of the liquid in the oil collecting tank (3) measured by the low-level density meter (301) is greater than 0.95 g / cm 3 When the low-level density meter (301) sends a signal to the controller; the controller sends control signals to the oil pump (303) and the water pump (402) respectively, the oil pump (303) is turned off, and the water pump (402) is turned on; the water pump (402) extracts the water phase (6) from the oil collecting tank (3).

9. The control method according to any one of claims 7 to 8, characterized in that: The step 3) comprises: 31) When the high-level densitometer (202) measures that the density of the liquid in the liquid separation tank (2) is greater than or equal to 0.9 g / cm 3 When the water level gauge (401) measures a water level higher than 80%, the water level gauge (401) sends a signal to the controller; the controller sends a control signal to the water pump (402), and the water pump (402) is turned on; the water pump (402) extracts the water phase (6) from the water collection tank (4); when the water level gauge (401) detects a water level lower than 60%, the water level gauge (401) sends a signal to the controller; the controller sends a control signal to the water pump (402), and the water pump (402) is turned off; 32) When the high-level densitometer (202) measures the density of the liquid in the liquid separation tank (2) to be less than 0.9 g / cm 3 When the water level is higher than 90%, the high-level density meter (202) sends a signal to the controller; the controller sends a control signal to the water pump (402), and the water pump (402) is turned off; the water level meter (401) detects that the water level is higher than 90%, and the water level meter (401) sends a signal to the controller; the controller sends a control signal to the water pump (402), and the water pump (402) is turned on; the water pump (402) extracts the water phase (6) from the sump (4).

10. The control method according to claim 9, characterized in that: In the step 2), the oil pump (303) pumps the oil phase (601) into the oil phase storage tank; in the step 3), the water pump (402) pumps the water phase (6) into the wastewater decontamination tank.

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