Oil impurity discharge system and oil impurity discharge method

Abstract

The invention provides an oil impurity discharging system and an oil impurity discharging method. The oil impurity discharge system comprises an oil storage cabin, a discharge cabin and a control system. Wherein the bottom of the oil storage tank is provided with a discharge port penetrating through the inside and outside of the oil storage tank, and a first oil-water interface detection sensor is arranged at a preset height position in the oil storage tank. The discharging cabin is connected with a discharging opening of the oil storage cabin through a discharging pipe, a discharging valve used for controlling the discharging pipe to be opened or closed is arranged on the discharging pipe, and the discharging valve is in a closed state in a normal state. The control system is in signal connection with the release valve and used for controlling the release valve to be opened or closed. The first oil-water interface detection sensor is in signal connection with the control system. According to the technical scheme, opening and closing of the release valve can be remotely achieved through the control system, a traditional mode that the valve is directly operated manually does not need to be adopted, and therefore inconvenience and danger caused by the traditional operation mode can be effectively avoided, and the efficiency and safety of the impurity release process are improved.

Description

Technical Field

[0001] The present application relates to the field of shipbuilding, and in particular to an oil impurity discharge system and an oil impurity discharge method. Background Art

[0002] In the field of ship transportation, diesel engines are usually used to provide power for ships. Among them, the fuel system and lubricating oil system are of vital importance to the normal operation of diesel engines. Fuel can provide energy sources for ships, while lubricating oil can reduce the friction between the moving parts inside the engine, reduce the degree of wear, and thus extend the service life of the parts. That is, the quality of fuel and lubricating oil will directly affect the performance of the diesel engine. Therefore, the reliable operation of the fuel and lubricating oil system is crucial to ensure the safe navigation and normal operation of the ship. However, in traditional fuel systems, although oil purification equipment is used to separate and purify the fuel, due to limited separation technology and other reasons, it cannot be guaranteed that all the water or impurities in the fuel are separated. Therefore, when the fuel enters the fuel tank, as time accumulates, impurities will continue to accumulate at the bottom of the tank. When the impurities accumulate to a certain extent, they may be sucked into the fuel supply system, resulting in poor combustion, black smoke, and even component failures in the diesel engine, affecting the normal operation of the ship. Similarly, the decline in lubricating oil quality will also have a negative impact on the ship's power system, and in severe cases may even lead to serious safety accidents.

[0003] In the prior art, to solve this problem, a discharge valve is usually installed at the bottom of the fuel tank / lubricating oil tank, and the crew manually discharges various impurities remaining in the tank bottom regularly or when necessary. However, the ship's engine room is usually compactly arranged, with many equipment and system pipelines. The manual discharge of impurities is not only time-consuming and labor-intensive, but also poses certain personnel safety risks, and its effect is often poor. It is easy to waste fuel / lubricating oil due to excessive discharge or the quality of fuel / lubricating oil cannot be guaranteed due to insufficient discharge. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide an oil impurity discharge system and an oil impurity discharge method. The oil impurity discharge system can remotely open and close the discharge valve through a control system without manual direct opening and closing of the discharge valve, which can effectively improve the efficiency and safety of the impurity discharge process.

[0005] In a first aspect, the present application provides an oil impurity discharge system, including an oil storage tank, a discharge tank and a control system. Among them, a discharge port that runs through the inside and outside of the oil storage tank is provided at the bottom of the oil storage tank, and a first oil-water interface detection sensor is provided at a preset height position inside the oil storage tank. The discharge tank is connected to the discharge port of the oil storage tank through a discharge pipe, and a discharge valve for controlling the conduction or closing of the discharge pipe is provided on the discharge pipe, and the discharge valve is in a closed state under normal conditions. The control system is connected to the discharge valve signal to control the opening or closing of the discharge valve. The first oil-water interface detection sensor is connected to the control system signal.

[0006] In an practicable solution, the discharge valve includes a two-position three-way solenoid valve and a pneumatic stop valve. One end of the pneumatic stop valve is arranged on the discharge pipe to control the conduction or closing of the discharge pipe, and the other end is connected to the air supply pipe for providing compressed gas to the pneumatic stop valve. The two-position three-way solenoid valve is arranged on the air supply pipe to control the conduction or closing of the air supply pipe.

[0007] In an implementable solution, the two-position three-way solenoid valve is connected to the control system signal to receive the valve opening and closing command signal from the control system. The pneumatic stop valve is connected to the control system signal to return the valve opening and closing state signal to the control system.

[0008] In an implementable solution, a second oil-water interface detection sensor is arranged at a preset height position inside the oil storage tank, and the second oil-water interface detection sensor is lower than the first oil-water interface detection sensor.

[0009] In an implementable scheme, one or more oil-water interface detection sensors are arranged inside the oil storage tank between the first oil-water interface detection sensor and the second oil-water interface detection sensor, each oil-water interface detection sensor is located at a different height position inside the oil storage tank, and each oil-water interface detection sensor is respectively connected to the control system signal.

[0010] In an implementable solution, an overflow port is provided on the surface of the oil storage tank at a preset height, and the overflow port is connected to the discharge tank through a pipeline.

[0011] In an implementable scheme, the oil impurity discharge system also includes an oil separator and a waste tank. The oil separator is connected to the discharge tank through a pipeline, receives the oil and impurity mixture from the discharge tank and separates the oil and impurities, and then transports the separated oil to the oil storage tank and transports the separated impurities to the waste tank.

[0012] In an implementable solution, the oil impurity discharge system further includes a three-way device, in which an inlet channel, an air outlet channel and an oil outlet channel are arranged. The first end of the inlet channel, the first end of the air outlet channel and the first end of the oil outlet channel are connected, and the second end of the inlet channel, the second end of the air outlet channel and the second end of the oil outlet channel are the inlet, air outlet and oil outlet of the three-way device respectively. The inlet and oil outlet of the three-way device are connected to the oil storage tank and the discharge tank through pipelines respectively.

[0013] In one practicable solution, the second end of the inlet channel of the three-way device is higher than the first end.

[0014] In a second aspect, the present application further provides an oil impurity discharge method, using the above-mentioned oil impurity discharge system, comprising the following steps:

[0015] S1. Start the control system to put the discharge valve in a normally closed state, and then inject oil into the oil storage tank;

[0016] S2. When the total amount of impurities in the oil reaches the preset standard, the height of the oil-water interface exceeds the height of the oil-water interface detection sensor, and the oil-water interface detection sensor sends a corresponding signal to the control system;

[0017] S3, the control system controls the discharge valve to open, so that the discharge pipe is connected and the oil impurities begin to be discharged;

[0018] S4. After the impurities are discharged, the control system controls the discharge valve to close, so that the discharge pipe is closed, and the discharge of oil impurities ends.

[0019] Compared with the prior art, the beneficial effects of this application include at least:

[0020] The present application provides an oil impurity release system. With the oil impurity release system, the opening and closing of the release valve can be remotely achieved through a control system without the need for traditional manual direct valve operation, thereby effectively avoiding the inconvenience and danger caused by traditional operation methods and improving the efficiency and safety of the impurity release process.

[0021] Furthermore, the technical solution of the present application combines the overflow port and the air vent of the oil storage tank, which can reduce the number of openings in the oil storage tank on the one hand, helping to enhance the sealing and structural strength of the oil storage tank; on the other hand, it can reduce the number of pipelines led out on the surface of the oil storage tank, and divert the pipelines at locations with sufficient space after they are led out, effectively avoiding the problem of insufficient space near the oil storage tank, thereby reducing the difficulty of pipeline layout and improving layout efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 Schematic diagram of the structure of an oil impurity discharge system according to an embodiment of the present application;

[0024] Figure 2 is a cross-sectional schematic diagram of a three-way device;

[0025] Figure 3 It is a schematic diagram of a method for releasing oil impurities according to an embodiment of the present application.

[0026] In the figure: 1. oil storage tank; 2. discharge tank; 3. control system; 4. oil separator; 5. waste tank; 6. three-way device; 101. first oil-water interface detection sensor; 102. second oil-water interface detection sensor; 111. overflow port; 112. oil return port; 201. discharge pipe; 202. discharge valve; 203. air supply pipe; 221. two-position three-way solenoid valve; 222. pneumatic stop valve; 401. barge pump; 601. inlet channel; 602. air outlet channel; 603. oil outlet channel; 611. inlet; 612. air outlet; 613. oil outlet. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0029] like Figure 1As shown, the present application provides an oil impurity discharge system, including an oil storage tank 1, a discharge tank 2 and a control system 3. Among them, the bottom of the oil storage tank 1 is provided with a discharge port that runs through the inside and outside of the oil storage tank 1, and a first oil-water interface detection sensor 101 is provided at a preset height position inside the oil storage tank 1. The discharge tank 2 is connected to the discharge port of the oil storage tank 1 through a discharge pipe 201, and a discharge valve 202 is provided on the discharge pipe 201 for controlling the discharge pipe 201 to be turned on or off. The discharge valve 202 is in a closed state under normal conditions. The control system 3 is connected to the discharge valve 202 by signal, and is used to control the discharge valve 202 to be opened or closed. The first oil-water interface detection sensor 101 is connected to the control system 3 by signal.

[0030] When there are impurities such as water in the oil in the oil storage tank, since the oil and water are immiscible and the density of water is greater than that of the oil, after standing for a period of time, the oil storage tank 1 will be divided into an upper oil layer and a lower water layer, and there is a clear boundary between the two layers. Due to the different conductivity of the oil layer and the water layer, when the first oil-water interface detection sensor 101 is in the oil layer and the water layer respectively, it will detect obvious capacitance changes and send the detection signal to the control system 3, that is, by setting the first oil-water interface detection sensor 101 at a preset height position, it can effectively detect whether the oil-water interface has reached the preset height position, so as to judge whether the total amount of impurities in the oil storage tank 1 has reached the critical point that needs to be discharged. After receiving the detection signal, the control system 3 sends a command signal to the discharge valve 202 to make the discharge pipe 201 conductive, and the oil impurities can be automatically discharged. By adjusting the preset height, the maximum value of the total amount of impurities allowed to exist in the oil storage tank 1 can be freely controlled. Specifically, a mounting hole (not shown in the figure) penetrating the inside and outside of the oil storage tank 1 can be set at a preset height position on the surface of the oil storage tank 1 for fixing and mounting the oil-water interface detection sensor 101. A timer can also be set in the control system 3. After the oil impurities are discharged for a preset time, the control system 3 controls the discharge valve 202 to close and end the discharge of the oil impurities. The specific discharge time can be determined by a prior test, or the discharge time can be estimated based on the total amount of impurities and the discharge speed.

[0031] In addition, a second oil-water interface detection sensor 102 may be provided at a preset height position inside the oil storage tank 1, and the second oil-water interface detection sensor 102 is lower than the first oil-water interface detection sensor 101. Preferably, the second oil-water interface detection sensor 102 may be provided above the discharge port of the oil storage tank 1 and close to the discharge port. After the discharge of oil impurities begins, the oil-water interface continues to drop. When the second oil-water interface detection sensor 102 detects a change in capacitance, it indicates that the oil-water interface has dropped to the height of the second oil-water interface detection sensor 102. At this time, the second oil-water interface detection sensor 102 sends a detection signal to the control system 3, which can control the discharge valve 202 to close, thereby ending the discharge of oil impurities. This setting helps to more accurately control the discharge of oil impurities and avoid over- or under-discharge.

[0032] Furthermore, inside the oil storage tank 1, one or more (for example, three) oil-water interface detection sensors can be arranged between the first oil-water interface detection sensor 101 and the second oil-water interface detection sensor 102, and each oil-water interface detection sensor is located at a different height position inside the oil storage tank 1, and each oil-water interface detection sensor is connected to the control system 3 by signal (not shown in the figure). Preferably, all oil-water interface detection sensors can be evenly distributed inside the oil storage tank 1 along the height direction. By setting a plurality of oil-water interface detection sensors, technicians can more accurately know the height range of the oil-water interface, which helps technicians to roughly understand the total amount of impurities in the current oil storage tank 1 and grasp the actual impurity accumulation speed.

[0033] In one embodiment, the control system 3 can also use a completely timed discharge method to discharge oil impurities. Specifically, the oil quality can be analyzed before the oil is injected into the oil storage tank 1 to obtain the analysis results of the water content and other impurity particles in the oil, and then the impurity accumulation rate in the oil storage tank 1 is estimated based on the analysis results, so as to determine the time point and duration for the impurities to be discharged. For example, if the analysis results show that the impurity content in the oil is low, the discharge valve 202 can be opened at 20:00 every day to start the discharge operation, and each discharge process lasts for 30 minutes. If the analysis results show that the impurity content in the oil is high, the discharge time can be extended to 1 hour or the discharge frequency can be increased to 2 times a day.

[0034] In addition, a manual switch can also be set in the control system 3, and the technician can remotely control the opening and closing state of the discharge valve at any time through the manual switch to enhance the flexibility of the oil impurity discharge system. In summary, the technical solution of the present application provides a variety of control methods for the discharge valve 202, which can be used alone or in combination to more accurately control the process of releasing impurities.

[0035] In one embodiment, the control system 3 may include a remote controller and a field controller (not shown in the figure), wherein the remote controller may be arranged in the main control room of the ship so that the ship operator can remotely operate and monitor, and the field controller may be arranged near the oil storage tank 1 so that the field technicians can perform operations such as debugging or maintenance. By adopting the oil impurity discharge system provided by the present application, the discharge valve 202 can be automatically opened and closed through the control system 3, without the need to adopt the traditional manual direct valve operation method, thereby effectively avoiding the inconvenience and danger caused by the traditional operation method, and improving the efficiency and safety of the discharge of impurities.

[0036] In one embodiment, if Figure 1 As shown, the discharge valve 202 may include a two-position three-way solenoid valve 221 and a pneumatic stop valve 222. One end of the pneumatic stop valve 222 is arranged on the discharge pipe 201 for controlling the conduction or closing of the discharge pipe 201, and the other end is connected to the air supply pipe 203 for providing compressed gas to the pneumatic stop valve 222. The two-position three-way solenoid valve 221 is arranged on the air supply pipe 203 for controlling the conduction or closing of the air supply pipe 203.

[0037] Preferably, the air supply pipe 203 can be connected to an external air source such as a compressed gas cylinder or an air compressor, and an air pressure detection device (not shown in the figure) can be set on the air supply pipe 203. The air pressure detection device can be connected to the control system 3 signal so that the cause of the problem can be found more quickly when a switch failure occurs in the discharge valve 202.

[0038] In one embodiment, the two-position three-way solenoid valve 221 is connected to the control system 3 by signal, and is used to receive the valve opening and closing command signal from the control system 3. The pneumatic stop valve 222 is connected to the control system 3 by signal, and is used to return the valve opening and closing state signal to the control system 3.

[0039] When the oil impurity discharge system is used, under normal conditions, the two-position three-way solenoid valve 221 is always energized to prevent compressed gas from entering the pneumatic stop valve 222, so that the pneumatic stop valve 222 is in a closed state, and the discharge pipe 201 is closed. When the control system 3 receives the relevant signal from the first oil-water interface detection sensor 101 or the timer that the valve needs to be opened, the control system 3 sends a valve opening command signal to the two-position three-way solenoid valve 221 to cut off the power supply of the two-position three-way solenoid valve 221, so that the compressed gas enters the inside of the pneumatic stop valve 222. At this time, the discharge pipe 201 is connected, and the impurities in the oil storage tank 1 begin to be discharged, and the pneumatic stop valve 222 returns an opening and closing state signal to the control system 4 indicating that the valve has been opened. After the impurities are released, the control system 3 will receive the relevant signal that the valve needs to be closed from the second oil-water interface detection sensor 102 or the timer, and then the control system 3 will send a valve closing command signal to the two-position three-way solenoid valve 221 to energize the two-position three-way solenoid valve 331, thereby preventing the compressed gas from entering the pneumatic stop valve 222, so that the discharge pipe 201 is no longer conductive. At this time, the pneumatic stop valve 222 returns an open / close state signal to the control system 3 indicating that the valve has been closed.

[0040] In one embodiment, a long liquid level observation window (not shown in the figure) can be provided on the surface of the oil storage tank 1, and one or more target liquid level scales can be provided next to the liquid level observation window. At the same time, a field switch can be provided on the discharge valve 202, so that when the oil impurity discharge system fails and cannot automatically or remotely open the valve to discharge impurities, the on-site technician can observe through the liquid level observation window whether the oil-water interface reaches the scale requiring valve opening and manually open the valve on site, which is an effective supplement to the oil impurity discharge system.

[0041] In one embodiment, if Figure 1 As shown, the surface of the oil storage tank 1 is provided with an overflow port 111 at a preset height, and the overflow port 111 is connected to the discharge tank 2 through a pipeline. Figure 1 As shown, the oil impurity discharge system may further include an oil separator 4 and a waste tank 5. The oil separator 4 is connected to the discharge tank 2 through a pipeline, receives the oil and impurity mixture from the discharge tank 2 and separates the oil and impurities, and then transports the separated oil to the oil storage tank 1, and transports the separated impurities to the waste tank 5.

[0042] Preferably, an oil return port 112 that runs through the inside and outside of the oil storage tank 1 can be set at the highest point of the oil storage tank 1, and the oil separator 4 can be connected to the oil return port 112 through a pipeline, so as to inject the separated oil into the oil storage tank 1. In addition, a transfer pump 401 can be set on the pipeline between the oil separator 4 and the discharge tank 2 to extract the liquid in the discharge tank 2 and transport it to a subsequent location. The transfer pump 401 can be connected to the control system 3 signal, and the control system 3 can control the start and stop state and other parameters of the transfer pump 401.

[0043] In one embodiment, if Figure 1 and Figure 2 As shown, the oil impurity discharge system also includes a three-way device 6, and the three-way device 6 is provided with an inlet channel 601, an air outlet channel 602 and an oil outlet channel 603. Among them, the first end of the inlet channel 601, the first end of the air outlet channel 602 and the first end of the oil outlet channel 603 are connected, and the second end of the inlet channel 601, the second end of the air outlet channel 602 and the second end of the oil outlet channel 603 are respectively the inlet 611, the air outlet 612 and the oil outlet 613 of the three-way device. The inlet 611 and the oil outlet 613 of the three-way device are connected to the oil storage tank 1 and the discharge tank 2 through pipelines.

[0044] In one embodiment, if Figure 2 As shown, the second end of the gas outlet channel 602 of the three-way device 6 can be made higher than the first end, that is, the inlet 611 of the three-way device 6 opens upward, so that the gas is discharged upward to the outside atmosphere or other exhaust positions, and at the same time, the second end of the gas outlet channel 602 of the three-way device 6 can be made lower than the first end, that is, the oil outlet 612 of the three-way device 6 opens downward, so that the oil can flow out smoothly. Preferably, the second end of the inlet channel 601 of the three-way device 6 can be made higher than the first end, so that when condensed water appears in the gas outlet channel 602 and falls, it can be ensured that the condensed water flows away along the oil outlet channel 603 and finally flows into the discharge tank 2, and will not return to the oil storage tank 1 through the inlet channel 601. In addition, the projection of the gas outlet channel 602 on the horizontal plane can also be made to completely fall into the projection of the oil outlet channel 603 on the horizontal plane, which also helps the condensed water in the gas outlet channel 602 to flow away along the oil outlet channel 603 and prevent the condensed water from flowing back into the oil storage tank 1.

[0045] Normally, the surface of the oil storage tank 1 can also be provided with a vent and connected to a vent pipe to maintain the air pressure balance inside and outside the oil storage tank 1. After the three-way device 6 is introduced, the vent and the overflow port 111 can be combined, that is, the two functions of venting and overflowing can be achieved through one overflow port 111. On the one hand, this can reduce the number of openings on the surface of the oil storage tank 1, which helps to enhance the sealing and structural strength of the oil storage tank 1. On the other hand, it can reduce the number of pipelines led out of the surface of the oil storage tank 1, and the pipelines can be diverted at a position with sufficient space after being led out, effectively avoiding the problem of insufficient space near the oil storage tank 1, thereby reducing the difficulty of pipeline layout and improving the layout efficiency.

[0046] like Figure 3 As shown, the present application also provides an oil impurity discharge method, using the above oil impurity discharge system, comprising the following steps:

[0047] S1. Start the control system to put the discharge valve in a normally closed state, and then inject oil into the oil storage tank;

[0048] S2. When the total amount of impurities in the oil reaches the preset standard, the height of the oil-water interface exceeds the height of the oil-water interface detection sensor, and the oil-water interface detection sensor sends a corresponding signal to the control system;

[0049] S3, the control system controls the discharge valve to open, so that the discharge pipe is connected and the oil impurities begin to be discharged;

[0050] S4. After the impurities are discharged, the control system controls the discharge valve to close, so that the discharge pipe is closed, and the discharge of oil impurities ends.

[0051] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An oil impurity discharge system, characterized in that: include: An oil storage tank (1), wherein a discharge port penetrating inside and outside the oil storage tank (1) is arranged at the bottom of the oil storage tank (1), and a first oil-water interface detection sensor (101) is arranged at a preset height position inside the oil storage tank (1); A discharge tank (2), the discharge tank (2) being connected to the discharge port of the oil storage tank (1) via a discharge pipe (201), the discharge pipe (201) being provided with a discharge valve (202) for controlling the conduction or closing of the discharge pipe (201), the discharge valve (202) being in a closed state under normal conditions; A control system (3), the control system (3) is connected to the discharge valve (202) by signal, and is used to control the discharge valve (202) to be opened or closed; the first oil-water interface detection sensor (101) is connected to the control system (3) by signal.

2. The oil impurity discharge system according to claim 1, characterized in that: The discharge valve (202) includes a two-position three-way solenoid valve (221) and a pneumatic stop valve (222); One end of the pneumatic stop valve (222) is arranged on the discharge pipe (201) for controlling the opening or closing of the discharge pipe (201), and the other end is connected to a gas supply pipe (203) for providing compressed gas to the pneumatic stop valve (222); The two-position three-way solenoid valve (221) is arranged on the air supply pipe (203) and is used to control the opening or closing of the air supply pipe (203).

3. The oil impurity discharge system according to claim 2, characterized in that: The two-position three-way solenoid valve (221) is connected to the control system (3) by signal, and is used to receive a valve opening and closing instruction signal from the control system (3); The pneumatic stop valve (222) is connected to the control system (3) by signal, and is used to return a valve opening / closing state signal to the control system (3).

4. The oil impurity discharge system according to claim 1, characterized in that: A second oil-water interface detection sensor (102) is arranged at a preset height position inside the oil storage tank (1), and the second oil-water interface detection sensor (102) is lower than the first oil-water interface detection sensor (101).

5. The oil impurity discharge system according to claim 4, characterized in that: One or more oil-water interface detection sensors are arranged inside the oil storage tank (1) between the first oil-water interface detection sensor (101) and the second oil-water interface detection sensor (102), each of the oil-water interface detection sensors being located at a different height inside the oil storage tank (1), and each of the oil-water interface detection sensors being connected to the control system (3) by signal.

6. The oil impurity discharge system according to claim 1, characterized in that: An overflow port (111) is provided on the surface of the oil storage tank (1) at a preset height position, and the overflow port (111) is connected to the discharge tank (2) via a pipeline.

7. The oil impurity discharge system according to claim 6, characterized in that: It also comprises an oil separator (4) and a waste tank (5), wherein the oil separator (4) is connected to the discharge tank (2) via a pipeline, receives a mixture of oil and impurities from the discharge tank (2) and separates the oil and impurities, then transports the separated oil to the oil storage tank (1), and transports the separated impurities to the waste tank (5).

8. The oil impurity discharge system according to claim 1, characterized in that: The invention also comprises a three-way device (6), wherein an inlet channel (601), an air outlet channel (602) and an oil outlet channel (603) are arranged inside the three-way device (6); wherein a first end of the inlet channel (601), a first end of the air outlet channel (602) and a first end of the oil outlet channel (603) are connected, and a second end of the inlet channel (601), a second end of the air outlet channel (602) and a second end of the oil outlet channel (603) are respectively an inlet (611), an air outlet (612) and an oil outlet (613) of the three-way device (6); and the inlet (611) and the oil outlet (613) of the three-way device (6) are respectively connected to the oil storage tank (1) and the discharge tank (2) through pipelines.

9. The oil impurity discharge system according to claim 8, characterized in that: The second end of the inlet channel (601) of the three-way device (6) is higher than the first end.

10. A method for releasing oil impurities, characterized in that: Using the oil impurity discharge system according to any one of claims 1 to 9, the oil impurity discharge method comprises: S1. Start the control system to put the discharge valve in a normally closed state, and then inject oil into the oil storage tank; S2. When the total amount of impurities in the oil reaches the preset standard, the height of the oil-water interface exceeds the height of the oil-water interface detection sensor, and the oil-water interface detection sensor sends a corresponding signal to the control system; S3, the control system controls the discharge valve to open, so that the discharge pipe is connected and the oil impurities begin to be discharged; S4. After the impurities are discharged, the control system controls the discharge valve to close, so that the discharge pipe is closed, and the discharge of oil impurities ends.

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