Tubular oil-water separation and purification device and system for accident oil pool of oil-immersed transformer

Abstract

The invention provides a tubular oil-water separation and purification device and system for an accident oil pool of an oil-immersed transformer. The tubular oil-water separation and purification device comprises an oil removal pipeline, a water inlet, a water outlet, three oil removal units and a silk screen. The upper wall of the pipeline is provided with hollows for fixing three oil removal units, and the three oil removal units are sequentially filled with zeolite, activated carbon and PP (polypropylene). A silk screen is arranged between every two adjacent units and comprises polyethylene screen cloth and modified wool felt. The surface of each oil removal unit is provided with a modified chip ceramic membrane with the aperture smaller than the filler particle size. The device realizes efficient oil-water separation through height difference, multi-stage filler sequence arrangement and a silk screen composite structure, the water quality after treatment is lower than 5mg / L, the national standard is met, and the device is simple and convenient to install, resistant to blockage and low in maintenance cost.

Description

Technical Field

[0001] This application belongs to the field of oil pollution purification, and in particular relates to a tubular oil-water separation and purification device and system for an oil-immersed transformer accident oil pool. Background Technology

[0002] In the power industry, oil-immersed transformers are critical equipment, and their safe and stable operation is essential for ensuring the reliability of the power grid. However, during operation, transformers may experience internal faults or external factors that cause oil temperature and pressure to rise, potentially leading to accidents such as oil leaks or explosions. These accidents not only damage equipment but can also cause serious environmental pollution, especially when harmful substances in transformer oil enter water bodies, which can have long-term adverse effects on the ecosystem.

[0003] Substations typically include emergency oil tanks to store and drain leaked transformer oil in the event of a transformer failure, preventing direct contamination of the oil into the environment. Emergency oil tanks are designed not only to have sufficient capacity to hold the leaked oil but also to effectively treat oil-water mixtures, ensuring that the discharged water meets environmental standards. Traditional emergency oil tank treatment methods primarily rely on oil separators, filter screens, or baffle stratification technologies. While these methods can reduce oil content to some extent, they still have many limitations in practical applications.

[0004] Specifically, traditional oil separators and filter screens primarily rely on physical interception and adsorption to remove oil. However, with prolonged use, the filter media easily becomes saturated and difficult to regenerate, leading to a decrease in treatment efficiency. Furthermore, these devices have limited effectiveness in removing tiny oil droplets and soluble oils, making it difficult to meet increasingly stringent environmental requirements. Baffle separation technology utilizes the density difference between oil and water for separation, but this method requires specific water flow conditions, and its separation efficiency is significantly affected by factors such as oil viscosity and temperature, making long-term stable operation difficult to guarantee.

[0005] Furthermore, traditional treatment methods suffer from high maintenance costs and complex operations. For example, filter screens need to be replaced regularly, increasing operating costs; oil separators and baffles require manual cleaning of oil sludge, which is not only labor-intensive but may also lead to secondary pollution if cleaning is not timely. With the continuous improvement of environmental regulations and the increasing public awareness of environmental protection, higher requirements are being placed on the treatment of substation accident oil pool wastewater, urgently necessitating a more efficient, reliable, and easy-to-maintain oil-water separation technology. Summary of the Invention

[0006] The purpose of this application is to overcome the defects in the prior art and provide a tubular oil-water separation and purification device and system for an oil-immersed transformer accident oil pool.

[0007] This application provides a tubular oil-water separation and purification device for an oil-immersed transformer emergency oil pool, comprising: an oil removal pipe, a water inlet, a water outlet, a first oil removal unit, a second oil removal unit, a third oil removal unit, and a wire mesh;

[0008] The water inlet is located on one side of the oil removal pipe, and the water outlet is located on the other side of the oil removal pipe. The height of the water inlet is greater than the height of the water outlet.

[0009] The upper wall of the oil removal pipe is provided with a hollow part, and the first oil removal unit, the second oil removal unit and the third oil removal unit are fixedly connected to the oil removal pipe through the hollow part and arranged in sequence along the direction of sewage flow.

[0010] The first oil removal unit is filled with zeolite, the second oil removal unit is filled with activated carbon, and the third oil removal unit is filled with PP polypropylene.

[0011] The wire mesh is provided between adjacent oil removal units. The wire mesh includes a polyethylene mesh and a modified wool felt. The polyethylene mesh is provided on the side near the water inlet, and the modified wool felt is provided on the side near the water outlet.

[0012] The surface of the degreasing unit is provided with a modified sheet ceramic membrane, the pore size of which is smaller than the particle size of the internal filler.

[0013] Oil-water separation is achieved through the combined effect of the height difference between the inlet and outlet, the sequential arrangement of multi-stage packing materials, and the composite structure of the wire mesh.

[0014] Optionally, the wire mesh includes: surface porosity;

[0015] The surface porosity is set within a preset porosity range to optimize filtration efficiency;

[0016] The surface porosity corresponds to the porosity conditions required for oil-water separation.

[0017] Optionally, the polyethylene mesh includes:

[0018] Set as a multi-layer structure, with the total thickness configured to a predetermined thickness;

[0019] The multi-layer structure corresponds to the layer configuration of the reinforced mechanical support.

[0020] Optionally, the modified wool felt comprises:

[0021] Set to multi-layer configuration, with the total thickness set to a fixed value;

[0022] The multilayer configuration corresponds to the number of layers required for oleophilic adsorption.

[0023] Optionally, the hollowed-out portion includes:

[0024] A triangular notch is provided, the spacing of which is adapted to the shape and thickness of the modified sheet ceramic membrane;

[0025] The matching relationship ensures the stability of the fixed connection.

[0026] Optional, also includes:

[0027] A sealing strip is provided at the edge, and the sealing strip fills the gaps in the inner wall of the pipe of the fixed insertion part.

[0028] Optionally, the spacing and thickness of the cutout portion are set within a preset range;

[0029] The spacing and the cutout thickness correspond to the space configuration required to fix the first degreasing unit, the second degreasing unit, and the third degreasing unit.

[0030] This application also provides an oil-immersed transformer emergency oil drainage treatment system, including an emergency oil pool and a tubular oil-water separation and purification device for the aforementioned oil-immersed transformer emergency oil pool. The device is installed at the outlet of the emergency oil pool and is used to treat oily wastewater.

[0031] The treatment of oily wastewater includes introducing wastewater through the inlet of the device, separating the oil and water, and then discharging purified water from the outlet.

[0032] Optionally, the device is installed at the outlet of the emergency oil tank, including:

[0033] The oil removal pipe is connected to the outlet pipe of the accident oil tank through a fixing component, ensuring that the sewage flows from the accident oil tank into the inlet of the device by gravity.

[0034] Optionally, the treatment of oily wastewater includes:

[0035] The wastewater flow rate is controlled within a preset range by adjusting the discharge valve of the accident oil tank to match the design processing capacity of the device.

[0036] The beneficial effects of this application are:

[0037] This application provides a tubular oil-water separation and purification device for an oil-immersed transformer emergency oil tank, comprising: an oil removal pipe, an inlet, an outlet, a first oil removal unit, a second oil removal unit, a third oil removal unit, and a wire mesh; the inlet is located on one side of the oil removal pipe, and the outlet is located on the other side of the oil removal pipe, with the height of the inlet greater than the height of the outlet; the upper wall of the oil removal pipe has a perforated portion, and the first, second, and third oil removal units are fixedly connected inside the oil removal pipe through the perforated portion and arranged sequentially along the direction of wastewater flow; the first oil removal unit... The first oil removal unit is filled with zeolite, the second oil removal unit is filled with activated carbon, and the third oil removal unit is filled with PP polypropylene. A wire mesh is provided between adjacent oil removal units. The wire mesh comprises polyethylene mesh and modified wool felt, with the polyethylene mesh positioned near the inlet and the modified wool felt positioned near the outlet. A modified sheet ceramic membrane is provided on the surface of each oil removal unit, with the pore size of the modified sheet ceramic membrane being smaller than the particle size of the internal packing material. Oil-water separation is achieved synergistically through the height difference between the inlet and outlet, the sequential arrangement of the multi-stage packing material, and the composite structure of the wire mesh. This application achieves highly efficient oil-water separation through a multi-stage packing material and wire mesh composite structure and height difference design. The treated water quality is below 5 mg / L, meeting national standards, and the system is easy to install, clog-resistant, and has low maintenance costs. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the tubular oil-water separation and purification device for the accident oil pool of an oil-immersed transformer in this application.

[0039] Figure 2 This is a cross-sectional schematic diagram of the oil removal device in this application. Detailed Implementation

[0040] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is to be understood that various forms of implementation of the present disclosure are intended and should not be limited to the embodiments set forth herein. Rather, the embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0041] Please refer to Figures 1-2 As shown, this application provides a tubular oil-water separation and purification device for the emergency oil pool of an oil-immersed transformer, applied in the field of wastewater treatment, to solve the problem of incomplete oil-water separation and environmental pollution during emergency oil discharge from oil-immersed transformers. The device includes:

[0042] An oil removal pipe 1 is installed, with an inlet 2 on one side and an outlet 3 on the other side. The height of the inlet 2 is greater than the height of the outlet 3, so that the sewage flows from the inlet 2 to the outlet 3 by gravity.

[0043] The oil removal pipe 1 is cylindrical, with a total length of 4.2~7m and a diameter of 800~1000mm, and the appropriate size can be selected according to the sewage discharge volume. The upper wall of the oil removal pipe 1 has a hollowed-out section for fixing and connecting the oil removal unit 4.

[0044] The oil removal unit 4 includes a first oil removal unit 14, a second oil removal unit 15, and a third oil removal unit 16, which are fixedly connected inside the oil removal pipe 1 through perforated portions and arranged sequentially along the direction of sewage flow. A wire mesh 9 is provided between adjacent oil removal units 4 for separation and auxiliary filtration. A modified sheet ceramic membrane 5 is provided on the surface of the oil removal unit 4, with a pore size smaller than the particle size of the internal packing material to ensure that the packing material does not flow out with the sewage.

[0045] Oil-water separation is achieved through the combined effect of the height difference between the inlet 2 and the outlet 3, the sequential arrangement of multi-stage packing materials, and the composite structure of the wire mesh 9. This device can be manufactured as a finished product or components in the factory and then installed or welded together on-site, making installation simple.

[0046] like Figures 1-2 As shown, the overall structure of the device, top view, and cross-section of the oil removal unit 4 are displayed.

[0047] Furthermore, due to various reasons, the effluent from the conventional emergency oil tank of a substation still contains a small amount of oil, which may cause pipe blockage and substandard effluent quality. If the wastewater from the emergency oil tank is not treated in a timely manner, it may result in the discharge of a large amount of oily wastewater. Therefore, it is considered to install this pipeline-type oil removal device at the outlet of the emergency oil tank to directly remove the oil and reduce the safety hazards of the emergency oil tank. This device has multiple oil removal stages, good oil removal effect, strong resistance to oil adhesion, will not clog, and is quick and convenient to clean, making full use of the gravity effect of pipeline transportation.

[0048] The height of the inlet 2 is greater than that of the outlet 3. The sewage is allowed to flow naturally by gravity. The hydraulic retention time is set to about 10 minutes, and the sewage flow rate is controlled at 0.5~1.0 m / s to ensure that the oily wastewater is in full contact with the packing material in the oil removal unit 4.

[0049] The head loss is controlled between 1.2 and 2.5 meters. If it exceeds this limit, a pipeline pump must be used to pressurize the water to ensure smooth outflow. This height difference design avoids additional energy consumption, achieving efficient flow through gravity and reducing maintenance costs. For example, in substation emergency oil tank applications, inlet 2 is located at a higher position, and outlet 3 is at a lower position. The wastewater flows using potential energy, requiring no external power, thus improving the system's reliability and economy.

[0050] Head loss refers to the energy loss of sewage during flow due to friction or obstacles, measured in meters. It reflects the resistance of the pipeline system, and proper control can ensure the stability of gravity flow. A pipeline pump is a pressurizing device used to increase driving force when gravity is insufficient. It is corrosion-resistant and suitable for oily wastewater environments.

[0051] A perforated section is provided on the upper wall of the oil removal pipe 1. This perforation, with a thickness of 30-50cm, is created every 70-90cm to form a semi-cylindrical opening for fixing the plug-in oil removal unit 4. The inner wall of the perforated section has triangular latches 12, the spacing of which matches the shape and thickness of the modified sheet ceramic membrane 5, ensuring a stable connection. The triangular latches 12 allow the oil removal unit 4 to be fixed by plugging in, preventing loosening. If necessary, the latch type can be changed or welding can be used to enhance the fixation. The spacing and thickness of the perforations correspond to the space required for fixing the oil removal unit 4. For example, for pipes with a diameter of 800-1000mm, the perforation provides sufficient space to accommodate the oil removal unit 4 while maintaining the integrity of the pipe structure.

[0052] The triangular bayonet 12 is a fixing structure on the inner wall of the hollow part of the oil removal pipe 1. It is triangular in shape and is used to fit with the sealing strip 13 on the edge of the oil removal unit 4 to ensure a stable connection. The modified sheet ceramic membrane 5 is a ceramic filter material that has undergone surface treatment. "Modified" means that the surface properties of the membrane are changed by chemical or physical methods, such as increasing hydrophilicity. "Sheet" means that the membrane has a flat structure, which is convenient for installation and cleaning.

[0053] Furthermore, if needed, the triangular bayonet 12 model can be replaced, or welding can be used to replace the fixing function of the sealing strip 13. Welding is a method of permanently connecting components by melting metal at high temperature, which is suitable for high vibration environments and can enhance sealing performance. The oil removal device fills the hollow part of the oil removal pipe 1, ensuring fit. The spacing of the triangular bayonet 12 is adapted to the membrane parameters, providing mechanical locking force to prevent unit displacement.

[0054] The first oil removal unit 14, the second oil removal unit 15, and the third oil removal unit 16 are fixedly connected inside the oil removal pipe 1 through the hollow part and arranged in sequence along the direction of sewage flow.

[0055] The oil removal unit 4 is cylindrical in shape, with a sealing strip 13 at its edge to fill the gaps in the inner wall of the pipe connecting the fixed part and prevent sewage leakage. The sealing strip 13 is adapted to the size and shape of the triangular bayonet 12, so that the hollow part fits and is fixed to the oil removal unit 4. The surface of the oil removal unit 4 is a modified sheet ceramic membrane 5 with a pore size of 4mm, a thickness controlled between 10 and 20cm, a water contact angle of 30 to 45°, and a flux of 2500 to 3000 L / (m²·h). The hydrophilicity and small pore size of the modified sheet ceramic membrane 5 ensure high-efficiency filtration, and the internal packing particle size is larger than the membrane pore size to prevent packing loss. This arrangement realizes multi-stage treatment, with sewage passing through three oil removal units in sequence to gradually remove oil.

[0056] The water contact angle is an indicator of the hydrophilicity of a material surface; the smaller the angle, the stronger the hydrophilicity. An angle of 30-45° allows the membrane to attract water molecules and repel oil. Flux refers to the volume of water passing through a unit membrane area per unit time. High flux of 2500-3000 L / (m²·h) reflects the processing capacity and suitability for high-flow-rate scenarios. The cylindrical shape of the oil removal unit 4 matches the pipeline, and the sealing strip 13 fills the pores to ensure no leakage.

[0057] Zeolite 6 is filled into the first oil removal unit 14. The filling length of zeolite 6 is 20~35cm, the porosity is 15~30%, and the particle size is 5~8mm, to ensure that the filler will not flow out with the sewage.

[0058] Zeolite 6 possesses high adsorption and ion exchange capabilities, effectively capturing oil droplets and impurities in wastewater. Activated carbon 7 is filled in the second oil removal unit 15. The activated carbon 7 has a filling length of 20-40 mm, a porosity of 60-85%, and a particle size of 6-9 mm. Its microporous structure provides a large specific surface area for adsorbing soluble oil and organic pollutants. PP polypropylene 8 is filled in the third oil removal unit 16. The PP polypropylene 8 has a filling length of 30-50 cm and a particle size of 5-8 mm. Its oleophobic properties further facilitate the separation of residual oil.

[0059] The multi-stage packing sequence, from inlet 2 to outlet 3, consists of zeolite 6, activated carbon 7, and PP polypropylene 8, achieving a transition from coarse filtration to fine filtration and improving oil removal efficiency.

[0060] Porosity refers to the ratio of pore volume to total volume within a material. Zeolite 6, with a porosity of 15-30%, is suitable for capturing large particles, while activated carbon 7, with a porosity of 60-85%, provides high adsorption capacity. Zeolite 6 is an aluminosilicate mineral with a porous structure, activated carbon 7 is a porous carbon material, and PP polypropylene 8 is a hydrophobic plastic. These material properties ensure comprehensive oil removal from physical adsorption to chemical action. The optimized packing sequence arrangement improves the processing flow: zeolite 6 handles large particles, activated carbon 7 adsorbs small molecules, and PP polypropylene 8 performs polishing.

[0061] A wire mesh 9 is provided between adjacent oil removal units 4. The wire mesh 9 includes a polyethylene mesh 10 and a modified wool felt 11, wherein the polyethylene mesh 10 is provided on the side near the water inlet 2 and the modified wool felt 11 is provided on the side near the water outlet 3.

[0062] The wire mesh 9 has a surface porosity of 50-70%, which is used to optimize filtration efficiency. The porosity corresponds to the porosity conditions required for oil-water separation, ensuring that oil is effectively retained. The polyethylene mesh 10 is set as a multi-layer structure, with a total of 3-5 layers and a total thickness of about 1cm. The multi-layer structure corresponds to the number of layers for reinforcing mechanical support, providing a stable filtration barrier.

[0063] The modified wool felt 11 is also configured in multiple layers, with a total of 3 to 5 layers and a total thickness of about 1 cm. The multiple layers correspond to the number of layers required for oleophilic adsorption. The modified wool felt 11 is oleophilic and can adsorb fine oil droplets. Polyethylene mesh 10 and modified wool felt 11 are respectively set on both sides of the wire mesh 9, forming a composite filter layer. When sewage flows through, it is first initially filtered by the polyethylene mesh 10, and then deeply adsorbed by the modified wool felt 11, which synergistically enhances the oil removal effect.

[0064] The surface porosity of the wire mesh 9, ranging from 50% to 70%, determines the filtration accuracy; higher porosity allows for more water flow, while lower porosity provides finer filtration. The multi-layered structure of the polyethylene mesh 10, with 3 to 5 layers of reinforcing mechanical support, and the multi-layered arrangement of the modified wool felt 11, increase the oleophilic surface area. The composite structure of the wire mesh 9 corresponds to the oil-water separation requirements, with the polyethylene mesh 10 providing support and the modified wool felt 11 performing adsorption, working together to prevent clogging.

[0065] A modified sheet ceramic membrane 5 with a pore size of 4mm is installed on the surface of the oil removal unit 4, smaller than the particle size of the internal packing material, to ensure that the packing material does not flow out with the sewage. The modified sheet ceramic membrane 5 has a water contact angle of 30~45° and a flux of 2500~3000L / (m²·h), exhibiting good water permeability and oil repellency. Oil-water separation is achieved through the synergistic effect of the height difference between the inlet 2 and the outlet 3, the sequential arrangement of multi-stage packing material, and the composite structure of the wire mesh 9. The final effluent has an oil content of less than 5mg / L, meeting national health standards. This device is suitable for treating sewage with an oil content of less than 200mg / L, with a design flow rate of 60~90L / s. It features multiple oil removal stages, excellent effect, strong resistance to oil adhesion, no clogging, and quick and convenient cleaning. For example, in the accident oil pool of a substation, sewage passes through five stages of barriers (three oil removal units and two layers of wire mesh 9), making grease almost undetectable, reducing the risk of pipeline blockage and environmental hazards.

[0066] The synergistic effect of height difference, filler sequence and wire mesh structure creates an overall effect and avoids single failure points; the oil content parameter is below 200mg / L as the input limit and below 5mg / L as the output standard, which meets national health requirements.

[0067] This application also provides an oil-immersed transformer emergency oil drainage treatment system, including an emergency oil pool and a tubular oil-water separation and purification device for the aforementioned oil-immersed transformer emergency oil pool. The device is installed at the outlet of the emergency oil pool and is used to treat oily wastewater.

[0068] The treatment of oily wastewater includes introducing wastewater through the inlet 2 of the device, and discharging purified water from the outlet 3 after oil-water separation.

[0069] Optionally, the device is installed at the outlet of the emergency oil tank, including:

[0070] The oil removal pipe 1 is connected to the outlet pipe of the accident oil tank through a fixing component, ensuring that the sewage flows from the accident oil tank into the inlet 2 of the device by gravity.

[0071] Optionally, the treatment of oily wastewater includes:

[0072] The wastewater flow rate is controlled within a preset range by adjusting the discharge valve of the accident oil tank to match the design processing capacity of the device.

[0073] The above description of the embodiments is provided to enable those skilled in the art to understand and apply this application. Those skilled in the art will readily make various modifications to the above embodiments and apply the general principles described herein to other embodiments without inventive effort. Therefore, this application is not limited to the above embodiments, and any improvements and modifications made to this application based on the disclosure thereof should be within the scope of protection of this application.

Claims

1. A tubular oil-water separation and purification device for an oil-immersed transformer emergency oil pool, characterized in that, include: Oil removal pipes, water inlet, water outlet, first oil removal unit, second oil removal unit, third oil removal unit, and wire mesh; The water inlet is located on one side of the oil removal pipe, and the water outlet is located on the other side of the oil removal pipe. The height of the water inlet is greater than the height of the water outlet. The upper wall of the oil removal pipe is provided with a hollow part, and the first oil removal unit, the second oil removal unit and the third oil removal unit are fixedly connected to the oil removal pipe through the hollow part and arranged in sequence along the direction of sewage flow. The first oil removal unit is filled with zeolite, the second oil removal unit is filled with activated carbon, and the third oil removal unit is filled with PP polypropylene. The wire mesh is provided between adjacent oil removal units. The wire mesh includes a polyethylene mesh and a modified wool felt. The polyethylene mesh is provided on the side near the water inlet, and the modified wool felt is provided on the side near the water outlet. The surface of the degreasing unit is provided with a modified sheet ceramic membrane, the pore size of which is smaller than the particle size of the internal filler. Oil-water separation is achieved through the combined effect of the height difference between the inlet and outlet, the sequential arrangement of multi-stage packing materials, and the composite structure of the wire mesh.

2. The apparatus according to claim 1, characterized in that, The wire mesh includes: surface porosity; The surface porosity is set within a preset porosity range to optimize filtration efficiency; The surface porosity corresponds to the porosity conditions required for oil-water separation.

3. The apparatus according to claim 1, characterized in that, The polyethylene mesh includes: Set as a multi-layer structure, with the total thickness configured to a predetermined thickness; The multi-layer structure corresponds to the layer configuration of the reinforced mechanical support.

4. The apparatus according to claim 1, characterized in that, The modified wool felt includes: Set to multi-layer configuration, with the total thickness set to a fixed value; The multilayer configuration corresponds to the number of layers required for oleophilic adsorption.

5. The apparatus according to claim 1, characterized in that, The hollowed-out portion includes: A triangular notch is provided, the spacing of which is adapted to the shape and thickness of the modified sheet ceramic membrane; The matching relationship ensures the stability of the fixed connection.

6. The apparatus according to claim 1, characterized in that, Also includes: Sealing strips are provided on the edges of the first oil removal unit, the second oil removal unit and the third oil removal unit, and the sealing strips fill the pores in the inner wall of the pipe of the fixed insertion part.

7. The apparatus according to claim 1, characterized in that, The spacing and thickness of the hollowed-out portions are within a preset range; The spacing and the cutout thickness correspond to the space configuration required to fix the first degreasing unit, the second degreasing unit, and the third degreasing unit.

8. A fault oil drainage system for an oil-immersed transformer, characterized in that, The invention includes a tubular oil-water separation and purification device for an oil-immersed transformer accident oil pool as described in any one of claims 1-7, wherein the device is installed at the outlet of the accident oil pool and is used to treat oily wastewater. The treatment of oily wastewater includes introducing wastewater through the inlet of the device, separating the oil and water, and then discharging purified water from the outlet.

9. The system according to claim 8, characterized in that, The device, installed at the outlet of the emergency oil tank, includes: The oil removal pipe is connected to the outlet pipe of the accident oil tank through a fixing component, ensuring that the sewage flows from the accident oil tank into the inlet of the device by gravity.

10. The system according to claim 8, characterized in that, The treatment of oily wastewater includes: The wastewater flow rate is controlled within a preset range by adjusting the discharge valve of the accident oil tank to match the design processing capacity of the device.

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