Oil-water separation membrane assembly based on stainless steel mesh, purification device and method

Abstract

The invention provides an oil-water separation membrane assembly based on a stainless steel mesh, a purification device and a purification method. The oil-water separation membrane assembly comprises a demulsification membrane and an oil-water separation membrane, the demulsification film comprises a net inner layer, a stainless steel net layer and a net outer layer which are sequentially arranged along a first direction; the inner net layer comprises a first filter material layer and a second filter material layer which are sequentially arranged in the first direction, and the precision of the first filter material layer is smaller than that of the second filter material layer; the net outer layer comprises a water absorption filter material layer, a first glass fiber net filter material layer, a filter material layer, a second glass fiber net filter material layer and a water absorption sock sleeve layer which are sequentially arranged in the first direction, and the water drop adsorption force of each layer of filter material is gradually increased from inside to outside; the oil-water separation membrane is a nano graphene mesh membrane, and the nano graphene mesh membrane comprises stainless steel mesh wires and a graphene coating cured on the surfaces of the stainless steel mesh wires. The demulsification membrane provided by the embodiment of the invention realizes complete demulsification of sump oil, so that the oil-water separation and purification precision is ensured.

Description

Technical Field

[0001] The present invention relates to the field of oil-water separation and purification materials, and belongs to the fields of new materials and environmental protection, and in particular to an oil-water separation membrane component based on a stainless steel mesh, a purification device and a method. Background Art

[0002] The effective separation of oil-water two-phase immiscible systems has a large number of application demands in many fields. The huge amount of oil-water mixture generated by ship ballast water, gas station oil tank seepage, oil refining, machinery and equipment processing, river oil leakage, ocean oil spills, oil field water injection and oil recovery, shale oil extraction, etc., realizes the separation of oil and water in oil-water mixture, especially the rapid and efficient treatment of large amounts of oil-water mixture, which is a major issue facing the current environmental protection field. The effective separation of oil-water mixture at low cost can not only recover oil for reuse and reduce the treatment cost of oil-water mixture, that is, reduce production and processing costs to bring economic benefits, but also greatly benefit the governance and protection of the environment, thereby increasing good social benefits.

[0003] Excellent oil-water separation and purification materials should possess high separation efficiency, high throughput, and high dirt holding capacity. Existing technologies also use oil-water separators to separate and purify hydraulic oil, but their accuracy and throughput are limited. They are difficult to adapt to ultra-high viscosity index hydraulic oils and cannot meet the requirements of efficient and high-precision oil-water separation and purification. Summary of the Invention

[0004] In response to the above defects or improvement needs of the prior art, the present invention provides an oil-water separation membrane assembly, purification device and method based on stainless steel mesh. The demulsification membrane achieves complete demulsification of the dirty oil, thereby ensuring the accuracy of oil-water separation and purification.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions.

[0006] In some embodiments, a stainless steel mesh-based oil-water separation membrane assembly is provided, wherein the oil-water separation membrane assembly includes an emulsification membrane and an oil-water separation membrane; The demulsification membrane includes a mesh inner layer, a stainless steel mesh layer, and a mesh outer layer sequentially arranged along a first direction; the mesh inner layer includes a first filter material layer and a second filter material layer sequentially arranged along the first direction, and the precision of the first filter material layer is less than that of the second filter material layer; the mesh outer layer includes a water-absorbing filter material layer, a first glass fiber mesh filter material layer, a filtration filter material layer, a second glass fiber mesh filter material layer, and a water-absorbing sock layer sequentially arranged along the first direction, and the adsorption force of each layer of filter material on water droplets gradually increases from the inside to the outside; The oil-water separation membrane is a nanographene mesh membrane, which includes a stainless steel mesh and a graphene coating cured on the surface of the stainless steel mesh. The contact angle of oil droplets on the surface of the nanographene mesh membrane is 0°, and the contact angle of water on the surface of the nanographene mesh membrane is greater than 150°.

[0007] In some embodiments, the precision of the first filter material layer is no greater than 10 μm, and the precision of the second filter material layer is no greater than 35 μm.

[0008] In some embodiments, an oil-water separation and purification device is further provided, the oil-water separation and purification device comprising the oil-water separation membrane assembly based on the stainless steel mesh as described in any one of the above items; The oil-water separation and purification device includes a demulsification filter cartridge and a separation filter cartridge; The demulsification filter cartridge is provided with a plurality of demulsification filter cartridges in the cartridge body, and the demulsification filter cartridges include demulsification membranes; A plurality of oil-water separation filter elements are arranged in the separation filter element cylinder, and the oil-water separation filter element includes an oil-water separation membrane.

[0009] In some embodiments, the oil-water separation and purification device itself does not have a pressurizing device.

[0010] In some embodiments, the oil-water separation and purification device includes a connecting device, which includes a lower connecting pipe, and the inner diameter of the lower connecting pipe is larger than the diameter of the oil inlet of the demulsification filter cylinder.

[0011] In some embodiments, a method for oil-water separation and purification using the oil-water separation and purification device as described in any one of the above items is further provided, the method comprising: delivering hydraulic oil to the oil-water separation and purification device at a first flow rate, wherein the first flow rate is the flow rate of the hydraulic oil in the hydraulic oil pipeline; The flow rate is reduced to a second flow rate through the demulsification filter element; The hydraulic oil enters the separation filter cartridge from the demulsification filter cartridge, and the flow rate increases to a third flow rate; The flow rate is reduced to the fourth flow rate after passing through the oil-water separation filter element, completing the oil-water separation and purification.

[0012] In some embodiments, the first flow rate V1, the second flow rate V2, the third flow rate V3, and the fourth flow rate V4 satisfy the relationship; Preferably, the first flow velocity is 0.015-0.016 m / s, the second flow velocity is 0.0023-0.0027 m / s, the third flow velocity is 0.0046-0.0054 m / s, and the fourth flow velocity is 0.0023-0.0027 m / s.

[0013] In some embodiments, the method includes: delivering the hydraulic oil directly to the oil inlet of the demulsification filter cartridge in a hydraulic oil pipeline.

[0014] In some embodiments, the viscosity index of the hydraulic oil is not less than 180.

[0015] In some embodiments, the method includes: preventing more than 99.99% of free water droplets from passing through the oil-water separation membrane, accumulating them into larger water droplets, and separating them by sinking due to the fact that water is heavier than oil.

[0016] Compared with the prior art, the beneficial effects of the present invention are at least as follows: in some embodiments, the demulsification membrane includes a mesh inner layer, a stainless steel mesh layer, and a mesh outer layer, wherein the precision of the first filter material layer in the mesh inner layer is less than that of the second filter material layer, and the filter material of the first filter material layer can cut the oil droplets wrapped in the water droplets in the emulsified oil droplets, so that the fine water droplets are separated from the oil droplets. The second filter material layer mainly forms two flow rates for water droplets and oil droplets through the different surface tensions of water and oil. The flow rate of water droplets is slower than that of oil droplets, and the water droplets can combine with each other. Each type of filter material in the mesh outer layer has different adsorption force on water droplets, and the adsorption force on water droplets gradually increases from the inside to the outside, so that the water droplets continue to combine and gather to become larger, and the flow rate of water droplets gradually slows down. In the embodiment of the present application, the demulsification membrane is used to achieve complete demulsification of the dirty oil, thereby ensuring the accuracy of oil-water separation and purification.

[0017] It should be noted that the above beneficial effects are merely the advantages and strengths of some embodiments of the present application compared to the prior art, and the beneficial effects of the present application are not limited thereto. For details, please refer to the description and records of the relevant technical solutions in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front schematic diagram of an ultra-high viscosity index hydraulic oil oil-water separation and purification device according to one embodiment of the present invention.

[0019] Figure 2 The figure is a side view of an oil-water separation and purification device for ultra-high viscosity index hydraulic oil according to one embodiment of the present invention.

[0020] Figure 3 Schematic front view of an oil-water separation and purification device for ultra-high viscosity index hydraulic oil according to other embodiments of the present invention.

[0021] Figure 4 The figure is a top view of an oil-water separation and purification device for ultra-high viscosity index hydraulic oil according to one embodiment of the present invention.

[0022] Figure 5 Schematic diagram of the partial structure of the demulsification filter cartridge in some embodiments.

[0023] Figure 6Schematic diagram of the partial structure of the separation filter cartridge body in some embodiments.

[0024] Figure 7 Schematic diagram of the partial structure of the demulsification filter element in some embodiments.

[0025] Figure 8 Schematic diagram of the structure of the demulsification membrane in some embodiments.

[0026] Figure 9 Schematic diagram of the structure of the oil-water separation filter element in some embodiments.

[0027] Figure 10 Schematic diagram of the structure of the oil-water separation membrane in some embodiments.

[0028] Figure 11 Schematic diagram of an oil-water separation and purification device in some embodiments.

[0029] Figure 12 Schematic diagram of the oil-water separation and purification method in some embodiments.

[0030] Explanation of reference numerals: demulsification device 1000; oil-water separation device 2000; communication device 3000; high oil level switch 4000; low oil level switch 5000; first pressure gauge 6000; second pressure gauge 7000; differential pressure monitoring module 8000; Demulsification filter cartridge body 1100, oil inlet 1101, first cartridge cover 1102, demulsification barrel body 1103, first exhaust port 1104, lifting ear 1105, first flange 1106, first pressure plate 1107; Demulsification filter element 1200; first tie rod 1201, end cover 1202, filter element glue 1203, demulsification membrane 1204; Inner mesh layer 1210, first filter material layer 1211, second filter material layer 1212; stainless steel mesh layer 1220; outer mesh layer 1230, water-absorbing filter material layer 1231, first glass fiber mesh filter material layer 1232, filter filter material layer 1233, second glass fiber mesh filter material layer 1234, water-absorbing sock layer 1235; Separation filter cartridge body 2100, oil outlet 2101, second cartridge cover 2102, separation cartridge body 2103, second exhaust port 2104, pressure plate 2105, second flange 2106, second pressure plate 2107; Oil-water separation filter element 2200, second pull rod 2201, oil-water separation membrane 2202; A first transverse connecting pipe 3100 and a second transverse connecting pipe 3200; First pipeline 8001, second pipeline 8002, differential pressure switch 8003; Junction box 9001, water level switch 9002, solenoid valve 9003, flow switch 9004, ball valve 9005. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0033] Figure 1 This is a front schematic diagram of an ultra-high viscosity index hydraulic oil oil-water separation and purification device according to one embodiment of the present invention. Figure 2 This is a side view of an ultra-high viscosity index hydraulic oil water separation and purification device according to an embodiment of the present invention. Figure 1 and Figure 2 In some embodiments of the present application, an oil-water separation and purification device for ultra-high viscosity index hydraulic oil is provided, and the oil-water separation and purification device includes a demulsification device 1000, an oil-water separation device 2000, and a connecting device 3000.

[0034] The demulsification device 1000 includes a vertically arranged demulsification filter cartridge body 1100 , in which a plurality of demulsification filter cartridges 1200 are arranged.

[0035] The oil-water separation device 2000 includes a vertically arranged separation filter cartridge body 2100 , in which a plurality of oil-water separation filter cartridges 2200 are arranged.

[0036] The connecting device 3000 includes a first transverse connecting pipe 3100 and a second transverse connecting pipe 3200, both of which are arranged horizontally to connect the demulsification filter cylinder and the separation filter cylinder. The first transverse connecting pipe is arranged above the second transverse connecting pipe and is used to prevent air accumulation. The second transverse connecting pipe is used to facilitate the flow of hydraulic oil between the demulsification filter cylinder and the separation filter cylinder.

[0037] In the embodiments of this application, viscosity index refers to the change in a fluid's viscosity with temperature. An ultra-high viscosity index means extremely low viscosity change with temperature, which ensures stable and consistent performance of the hydraulic oil under varying operating conditions. The oil-water separation and purification device is used to separate water from hydraulic oil with an ultra-high viscosity index. The viscosity index of ultra-high viscosity index hydraulic oil is generally no less than 180. This extremely high viscosity index results in small, uniformly dispersed particles after agitation, making it less likely to coalesce into large droplets that settle and separate.

[0038] In the embodiments of the present application, multiple demulsification filters are installed within the demulsification filter cartridge, and multiple oil-water separation filters are installed within the separation filter cartridge, which are used to first demulsify the ultra-high viscosity index hydraulic oil and then further separate the oil and water. Furthermore, multiple demulsification filters and multiple oil-water separation filters ensure both separation accuracy and high throughput, avoiding the situation where a single demulsification filter cartridge and oil-water separation filter cartridge cannot simultaneously meet both accuracy and throughput requirements. Specifically, the water-containing hydraulic oil is input into the demulsification filter cylinder from the oil inlet 1101 and enters the interior of the demulsification filter. After passing through the special structure of the demulsification filter material, the small water droplets in the emulsified oil (i.e., the oil-in-water phenomenon) are separated from the oil and combined into larger water droplets. The hydraulic oil and water droplets flow out from the outside of the demulsification filter together, and flow to the oil-water separation filter in the separation filter cylinder through the second horizontal connecting pipe. 99.99% of the water droplets are blocked outside the oil-water separation filter, and the hydraulic oil flows from the outside of the oil-water separation filter into the inside of the oil-water separation filter, and then flows back to the oil tank from the oil outlet 2101.

[0039] In an embodiment of the present application, the center of the upper end of the demulsification filter cylinder has an oil inlet 1101, and the center of the upper end of the separation filter cylinder has an oil outlet 2101. The oil inlet is used to connect to the hydraulic oil tank, and the oil outlet is used to connect to the hydraulic oil tank. In an embodiment of the present application, the oil-water separation purification device itself does not have a pressurizing device. The hydraulic oil is directly transported from the oil tank to the oil inlet of the demulsification filter cylinder through the hydraulic oil pipeline. It is understandable that a hydraulic pump is provided on the hydraulic oil pipeline, and the hydraulic pump can also be provided in the oil tank. The hydraulic pump can be provided by the hydraulic oil pipeline itself and is used to provide liquid pressure. In an embodiment of the present application, the oil-water separation purification device can be directly connected to the existing hydraulic system, and the oil-water separation purification device itself is no longer provided with a pressurizing device, which is convenient for disassembly, and can also keep the inlet pressure of the purification device consistent with the pressure in the hydraulic oil pipeline, so as to facilitate the control of flow rate and flux.

[0040] In an embodiment of the present application, the demulsification filter cartridge and the separation filter cartridge are arranged vertically, and the second transverse connecting pipe is arranged horizontally at the lower part of the demulsification filter cartridge and the separation filter cartridge, and the second transverse connecting pipe is a lower connecting pipe, and the hydraulic oil flows from the demulsification filter cartridge into the separation filter cartridge through the second transverse connecting pipe. The connecting device also includes a first transverse connecting pipe, and the air in the demulsification filter cartridge can flow into the separation filter cartridge through the first transverse connecting pipe and then be discharged. At the same time, the first transverse connecting pipe is arranged horizontally at the upper part of the demulsification filter cartridge and the separation filter cartridge, and the first transverse connecting pipe is an upper connecting pipe, and the first transverse connecting pipe connects the demulsification filter cartridge and the separation filter cartridge, so as to keep the pressure in the demulsification filter cartridge and the separation filter cartridge consistent as much as possible, avoid forming an excessive pressure difference, thereby preventing air from gathering in the demulsification filter cartridge and forming a cyclone, and not causing the air in the demulsification filter cartridge to increase the flow rate of the hydraulic oil, affecting the sedimentation of the water droplets flowing out of the demulsification filter cartridge.

[0041] In some embodiments, the inner diameter of the first transverse connecting tube is smaller than the inner diameter of the second transverse connecting tube. In some embodiments, the inner diameter of the lower connecting tube, i.e., the second transverse connecting tube, is larger than the diameter of the oil inlet of the demulsification filter cartridge.

[0042] In the embodiment of the present application, the inner diameter of the second transverse connecting pipe is set to be larger, so that the oil in the demulsification filter cylinder can enter the separation filter cylinder in time, prevent aggregation and eliminate turbulence.

[0043] Specifically, in some embodiments, the inner diameter of the oil inlet 1101 is 15-30 mm, the inner diameter of the oil outlet 2101 is 15-30 mm, and the inner diameter of the oil inlet 1101 is equal to the inner diameter of the oil outlet 2101. In some embodiments, the inner diameter of the first transverse connecting tube is 50-100 mm, and the inner diameter of the second transverse connecting tube is 200-300 mm. In some embodiments, the outer diameters of the demulsification filter cartridge cylinder and the separation filter cartridge cylinder are equal. The outer diameters of the demulsification filter cartridge cylinder and the separation filter cartridge cylinder are 350-400 mm. The inner diameter of the second transverse connecting tube is smaller than the outer diameters of the demulsification filter cartridge cylinder and the separation filter cartridge cylinder.

[0044] In some embodiments, the demulsification filter cartridge body 1100 includes a demulsification barrel body 1103 and a first barrel cover 1102 detachably connected to the demulsification barrel body 1103, and the separation filter cartridge body 2100 includes a separation barrel body 2103 and a second barrel cover 2102 detachably connected to the separation barrel body 2103; the demulsification filter cartridge can be removed and replaced from the upper portion of the demulsification filter cartridge body, and the oil-water separation filter cartridge can be removed and replaced from the upper portion of the separation filter cartridge body. Specifically, the main body of the demulsification barrel body 1103 and the separation barrel body 2103 is cylindrical, and the first barrel cover 1102 and the second barrel cover 2102 are respectively disposed at the upper ends of the demulsification barrel body 1103 and the separation barrel body 2103. The first barrel cover 1102 is detachably connected to the demulsification barrel body 1103 by screws. Specifically, the first barrel cover 1102 and the demulsification barrel body 1103 are circumferentially provided with a first flange 1106, and the first flange 1106 has a threaded hole. The first cover 1102 and the demulsification barrel body 1103 are connected by screws through the first flange 1106. The second cover 2102 and the separation barrel body 2103 are detachably connected by screws. Specifically, the circumference of the second cover 2102 and the separation barrel body 2103 has a second flange 2106, and the second flange 2106 has a threaded hole. The second cover 2102 and the separation barrel body 2103 are connected by screws through the second flange 2106. In certain embodiments, the first cover 1102 and the second cover 2102 both have a lifting lug 1105. Two lifting lugs 1105 are symmetrically arranged on the first cover 1102, and two lifting lugs 1105 are symmetrically arranged on the second cover 2102. The lifting lugs are used to carry the first cover 1102 and the second cover 2102 by hand during disassembly and installation, making it convenient for disassembly and replacement.

[0045] In some embodiments, the demulsification filter element 1200 is disposed within the demulsification barrel 1103. An oil inlet cavity is defined between the first barrel cover 1102 and the demulsification barrel 1103. The oil inlet cavity is connected to the oil inlet port 1101 and the demulsification filter element 1200. Hydraulic oil enters the oil inlet cavity from the oil inlet port 1101 and then flows into the demulsification filter element 1200.

[0046] The oil-water separator filter element 2200 is disposed within the separator body 2103. An oil outlet cavity is defined between the second cover 2102 and the separator body 2103. The oil outlet cavity communicates with the oil outlet port 2101 and the oil-water separator filter element 2200. Hydraulic oil enters the oil outlet cavity from the oil-water separator filter element 2200 and then flows back to the fuel tank through the oil outlet port 2101.

[0047] In an embodiment of the present application, the oil inlet 1101 is disposed at the center of the first cylinder cover 1102, and the oil outlet 2101 is disposed at the center of the second cylinder cover 2102. In some embodiments, the first cylinder cover 1102 is further provided with a first exhaust port 1104, and the second cylinder cover 2102 is further provided with a second exhaust port 2104. Both the first exhaust port 1104 and the second exhaust port 2104 have exhaust valves. The first exhaust port 1104 and the second exhaust port 2104 are used to exhaust air from the demulsification filter cartridge cylinder and the separation filter cartridge cylinder, respectively. The first exhaust port 1104 is in communication with the oil inlet cavity. The second exhaust port 2104 is in communication with the oil outlet cavity.

[0048] In an embodiment of the present application, when performing oil-water separation and purification, the demulsification filter cartridge cylinder 1100 and the separation filter cartridge cylinder 2100 are connected via the first transverse connecting pipe 3100. In the initial stage of oil inlet, the first exhaust port 1104 and the second exhaust port 2104 are both opened, and hydraulic oil enters the demulsification filter cartridge 1200 through the oil inlet 1101. The air in the demulsification filter cartridge cylinder 1100 can enter the separation filter cartridge cylinder through the first transverse connecting pipe 3100 and then be discharged through the second exhaust port 2104. The provision of the first transverse connecting pipe 3100 ensures that air can be removed in a timely and effective manner, thus avoiding the formation of turbulence when there is a lot of hydraulic oil in the demulsification filter cartridge cylinder and only the exhaust port is used to discharge the air.

[0049] In some embodiments, the oil-water separation and purification device further includes a high oil level switch 4000 and a low oil level switch 5000. The high oil level switch 4000 is disposed on the second cylinder cover 2102 and is in communication with the interior of the separation filter cartridge cylinder. The low oil level switch 5000 is disposed at the lower portion of the demulsification filter cartridge cylinder 1100. In an embodiment of the present application, when the hydraulic oil in the separation filter cartridge cylinder contacts the high oil level switch 4000, the high oil level switch 4000 can provide feedback to indicate that the oil has filled the second cylinder cover 2102. When the high oil level switch 4000 provides feedback, the first and second exhaust ports 1104, 2104 can be closed. In an embodiment of the present application, the low oil level switch 5000 is used to indicate that the oil in the demulsification filter cartridge cylinder 1100 is below a preset height. When the oil in the demulsification filter cartridge cylinder 1100 is below the preset height, the low oil level switch 5000 provides feedback.

[0050] In some embodiments, the oil-water separation purification device further includes a first pressure gauge 6000 and a second pressure gauge 7000. The first pressure gauge 6000 is disposed on the first cylinder cover 1102 and is in communication with the interior of the demulsification filter cartridge cylinder 1100. The second pressure gauge 7000 is disposed on the second cylinder cover 2102 and is in communication with the interior of the separation filter cartridge cylinder 2100. The first pressure gauge 6000 is in communication with the oil inlet cavity for monitoring the oil inlet pressure. The second pressure gauge 7000 is in communication with the oil outlet cavity for monitoring the oil outlet pressure. In some embodiments, the first pressure gauge 6000 further includes an alarm module configured to sound an alarm when the oil inlet pressure exceeds a preset pressure value. The second pressure gauge 7000 is configured for simple pressure monitoring and does not have an alarm function. In embodiments of the present application, the alarm module of the first pressure gauge 6000 can detect the maximum pressure value of the oil-water separation purification device, detect problems in a timely manner, and prevent irreversible damage caused by excessive pressure.

[0051] In some embodiments, the oil-water separation and purification device further includes a pressure differential monitoring module 8000. Specifically, the pressure differential monitoring module 8000 includes a first pipe 8001, a second pipe 8002, and a pressure differential switch 8003. The pressure differential switch 8003 is disposed outside the separation filter cartridge body 2100, specifically, fixed on the side wall of the separation cylinder body 2103. One end of the first pipe 8001, i.e., the first end, is connected to the pressure differential switch 8003, and the other end, i.e., the second end, is disposed in the oil inlet cavity. One end of the second pipe 8002, i.e., the first end, is connected to the pressure differential switch 8003, and the other end, i.e., the second end, is disposed in the oil outlet cavity. Specifically, the first pipe 8001 extends upward through the demulsification cylinder body 1103 into the oil inlet cavity, and the second pipe 8002 extends upward through the separation cylinder body 2103 into the oil outlet cavity.

[0052] In some embodiments of the present application, at least one of the first pipe 8001 and the second pipe 8002 passes through the first transverse connecting pipe 3100 and enters the demulsification filter cartridge cylinder 1100 from the connection between the first transverse connecting pipe 3100 and the demulsification filter cartridge cylinder 1100 or enters the separation filter cartridge cylinder 2100 from the connection between the first transverse connecting pipe 3100 and the separation filter cartridge cylinder 2100.

[0053] refer to Figure 1 In some embodiments, the first pipe 8001 passes through the first transverse connecting pipe 3100 and enters the demulsification filter cartridge body 1100 from the connection point between the first transverse connecting pipe 3100 and the demulsification filter cartridge body 1100. The second end of the first pipe 8001 extends upward along the demulsification filter cartridge body 1100 into the oil inlet cavity.

[0054] In some embodiments, the second pipe 8002 passes through the first transverse connecting pipe 3100 and enters the separation filter element cylinder 2100 from the connection point between the first transverse connecting pipe 3100 and the separation filter element cylinder 2100, and the second end of the second pipe 8002 extends upward along the separation filter element cylinder 2100 into the oil outlet cavity.

[0055] In an embodiment of the present application, the first pipe 8001 enters the oil inlet cavity of the demulsification filter cartridge body 1100 from the first transverse connecting pipe 3100, and the second pipe 8002 enters the oil outlet cavity of the separation filter cartridge body 2100 from the first transverse connecting pipe 3100, thereby avoiding setting an interface from the first cylinder cover 1102 and the second cylinder cover 2102, and also avoiding directly opening holes on the demulsification barrel body 1103 and the separation barrel body 2103, which is conducive to the disassembly and installation of the first cylinder cover 1102 and the second cylinder cover 2102, and conveniently disassembling and installing the demulsification filter cartridge and the separation filter cartridge from the first cylinder cover 1102 and the second cylinder cover 2102. In the implementation of the present application, the pressure differential switch 8003 can monitor the pressure difference between the oil inlet and the oil outlet, and when the pressure differential is greater than the preset pressure differential value, an alarm is issued.

[0056] Figure 3 Schematic front view of an oil-water separation and purification device for ultra-high viscosity index hydraulic oil according to other embodiments of the present invention. Figure 4 This is a top view of an oil-water separation and purification device for ultra-high viscosity index hydraulic oil according to one embodiment of the present invention. Figure 3 and Figure 4 In some embodiments of the present application, when the length of the first transverse connecting pipe 3100 is relatively short, one of the first pipe 8001 and the second pipe 8002 enters the demulsification filter cartridge body 1100 or the separation filter cartridge body 2100 from the first transverse connecting pipe 3100 .

[0057] refer to Figure 3 In some embodiments, the first pipe 8001 enters the oil inlet cavity of the demulsification filter cartridge body 1100 from the first transverse connecting pipe 3100, and the second pipe 8002 directly enters the oil outlet cavity of the separation filter cartridge body 2100 from the side wall of the separation filter cartridge body 2100.

[0058] In the embodiment of the present application, the provision of an interface between the first barrel cover 1102 and the second barrel cover 2102 is avoided, which facilitates the removal and installation of the first barrel cover 1102 and the second barrel cover 2102, and facilitates the removal, installation, and replacement of the demulsification filter element and the separation filter element from the first barrel cover 1102 and the second barrel cover 2102. In addition, one of the first pipe 8001 and the second pipe 8002 enters the demulsification filter element cylinder 1100 or the separation filter element cylinder 2100 through the first transverse connecting pipe 3100, which rationally utilizes the space of the first transverse connecting pipe 3100 and ensures connection reliability.

[0059] Figure 5 Schematic diagram of the partial structure of the demulsification filter cartridge in some embodiments. Figure 6 This is a schematic diagram of a partial structure of the separation filter cartridge in some embodiments. In some embodiments, the demulsifier filter cartridge can be easily removed from the cartridge for cleaning and replacement. Each demulsifier filter cartridge measures 130 mm x 500 mm, with an outer diameter of 130 mm and a height of 500 mm. The oil-water separator filter cartridge can be easily removed and replaced from the upper end of the cartridge cartridge. Each oil-water separator filter cartridge measures 150 mm x 500 mm, with an outer diameter of 150 mm and a height of 500 mm.

[0060] In the embodiments of the present application, the demulsification filter element and the oil-water separation filter element can be removed and replaced from the upper end of the cylinder, and the size of each filter element is designed to be small. Multiple filter elements are arranged in parallel, which makes it more convenient to disassemble and replace while ensuring the flux.

[0061] In some embodiments, the demulsification filter cartridge is provided with four demulsification filter cartridges, and the four demulsification filter cartridges are arranged vertically. The separation filter cartridge is provided with three oil-water separation filter cartridges, and the three oil-water separation filter cartridges are arranged vertically.

[0062] In the embodiment of the present application, the four demulsification filter elements are evenly distributed circumferentially around the axis of the demulsification barrel 1103. The centers of the four demulsification filter elements are on the same arc, and the center of the arc coincides with the axis of the demulsification barrel 1103. In the embodiment of the present application, the waste oil in the oil inlet cavity simultaneously enters the inner cavity of the four demulsification filter elements, then flows outward into the space between the inner wall of the demulsification barrel 1103 and the demulsification filter elements, and then flows into the separation filter element cylinder 2100 through the second transverse connecting pipe 3200.

[0063] In some embodiments, each demulsification filter element is locked and fixed by multiple first pressure plates 1107. In some embodiments, each demulsification filter element is locked and fixed by three first pressure plates 1107 evenly distributed around the circumference. In some embodiments, the first pressure plate 1107 is detachably connected to the demulsification barrel 1103 or the first flange 1106. In the embodiments of the present application, the demulsification filter element is locked and fixed by the first pressure plate 1107, which is removable or rotatable to facilitate the positioning of the demulsification filter element.

[0064] In some embodiments, each demulsification filter element has a first pull rod 1201 on the top. The first pull rod 1201 can be locked at both ends of the demulsification filter element, and it is convenient to lift the demulsification filter element and facilitate disassembly and installation.

[0065] In the embodiment of the present application, the three oil-water separation filter elements are evenly distributed circumferentially around the axis of the separation cylinder 2103. The centers of the three oil-water separation filter elements are located on the same arc, and the center of the arc coincides with the axis of the separation cylinder 2103. In the embodiment of the present application, waste oil entering the separation filter cylinder 2100 passes through the three oil-water separation filter elements simultaneously, enters the inner cavity of the oil-water separation filter element, and then flows into the oil outlet cavity.

[0066] In some embodiments, each oil-water separation filter element is locked and fixed by a pressure plate 2105 and multiple second pressure plates 2107. In some embodiments, the pressure plate 2105 is set in the middle of the three oil-water separation filter elements, and locks and fixes the three oil-water separation filter elements at the same time, making full use of the spatial position. Two second pressure plates 2107 are also set on the outside of each oil-water separation filter element. In some embodiments, the pressure plate 2105 and multiple second pressure plates 2107 are detachably connected to the separation cylinder body 2103 or the second flange 2106. In the embodiments of the present application, the oil-water separation filter element is locked and fixed by the pressure plate 2105 and the second pressure plate 2107, and the second pressure plate 2107 is a detachable or rotatable pressure plate, which is convenient for limiting the oil-water separation filter element.

[0067] In some embodiments, each oil-water separation filter element has a second pull rod 2201 on the top. The second pull rod 2201 can be locked at both ends of the oil-water separation filter element, making it easy to lift the oil-water separation filter element and facilitate disassembly and installation.

[0068] In some embodiments, the flux of the oil-water separation purification device is not less than 1.8m 3 / h.

[0069] In the embodiment of the present application, the demulsification filter element has a size of Φ130×500mm, 4 pieces, an effective height of 480mm, and a unit flux of the demulsification filter element KP0=3m 3 / ㎡ (pressure 0.8MPa, pressure difference ≤0.4MPa).

[0070] The flux of a single demulsification filter element KP1 = the side surface area SP of the demulsification filter element × unit flux KP0 = (0.13 × 3.14 × 0.48) × 3m 3 / h=0.588m 3 / h.

[0071] Total flux of demulsification filter cartridge KP2=0.588m 3 / h×4=2.352m 3 / h.

[0072] In the embodiment of the present application, four demulsification filter elements are used, and the total flux of the demulsification filter element cylinder is greater than 1.8m 3 / h.

[0073] In the embodiment of the present application, the oil-water separation filter element has a size of Φ150×500mm, 3 pieces, and an effective height of 480mm. The unit flux of the oil-water separation filter element KY0=3m 3 / ㎡.

[0074] The flux of a single oil-water separation filter element KY1 = the side surface area of ​​the oil-water separation filter element SY × unit flux KY0 = (0.15 × 3.14 × 0.48) × 3m 3 / h=0.678m 3 / h.

[0075] Total flux of separation filter cartridge KY2=0.678m 3 / h×3=2.034m 3 / h.

[0076] In the embodiment of the present application, three oil-water separation filter elements are used, and the total flux of the separation filter element cylinder is greater than 1.8m 3 / h.

[0077] Figure 7 Schematic diagram of the partial structure of the demulsification filter element in some embodiments. Figure 8 Schematic diagram of the structure of the demulsification membrane in some embodiments. Figure 8 for Figure 7 An enlarged schematic diagram of part A in the figure. In some embodiments, the demulsification filter element has end caps 1202 at both ends, and the two ends of the demulsification membrane are fixed in the end caps 1202 by filter element glue 1203. In some embodiments, the demulsification filter element 1200 includes a demulsification membrane 1204. In some embodiments, the demulsification membrane includes a mesh inner layer 1210, a stainless steel mesh layer 1220, and a mesh outer layer 1230, which are arranged radially from the inside to the outside. The mesh inner layer includes a first filter material layer 1211 and a second filter material layer 1212, which are arranged radially from the inside to the outside, and the precision of the first filter material layer is less than the precision of the second filter material layer. In some embodiments, the precision of the first filter material layer is not greater than 10 μm, and the precision of the second filter material layer is not greater than 35 μm.

[0078] In the embodiment of the present application, the stainless steel mesh layer adopts stainless steel mesh, and the material of the stainless steel mesh is stainless steel material, specifically 022Cr17Ni12Mo2, which has the advantages of high hardness, high strength, and easy cleaning. At the same time, it can filter impurities, break emulsions, and facilitate maintenance and replacement.

[0079] Two different filter materials are compounded in the stainless steel mesh to form the first filter material layer 1211 and the second filter material layer 1212. In some embodiments, the precision of the first filter material layer 1211 is 10 μm, and the maximum pore size is also only 10 μm. The filter material of the first filter material layer can cut the oil droplets wrapped in the water droplets in the emulsified oil droplets, so that the fine water droplets are separated from the oil droplets. In some embodiments, the precision of the second filter material layer is 35 μm. It mainly uses the different surface tensions of water and oil to form two flow rates of water droplets and oil droplets. The flow rate of water droplets is slower than that of oil droplets, and the water droplets can combine with each other. In the embodiment of the present application, the surface tension of water is 72.75×10 -3 N / m, and the surface tension of ultra-high viscosity index hydraulic oil is 17.7 mN / m. In some embodiments, the first filter layer can have 3-5 layers of filter material, and the second filter layer can have 7-10 layers of filter material to ensure accuracy. In some embodiments, both the first filter layer 1211 and the second filter layer 1212 are made of a fiberglass mesh composite material.

[0080] In some embodiments, the outer layer of the mesh includes a water-absorbing filter material layer 1231, a first glass fiber mesh filter material layer 1232, a filter filter material layer 1233, a second glass fiber mesh filter material layer 1234, and a water-absorbing sock layer 1235, which are arranged radially from the inside to the outside. The adsorption force of each layer of filter material on water droplets gradually increases from the inside to the outside.

[0081] In the embodiments of this application, each filter material in the outer layer of the mesh has a different adsorption capacity for water droplets, with the adsorption capacity gradually increasing from the inside out. This causes the droplets to continuously coalesce and aggregate, growing larger, and the droplet flow rate gradually slowing. One to five layers of each filter material can be provided in the outer layer of the mesh, with an overall thickness of 20mm-30mm, achieving a long channel for demulsification.

[0082] In some embodiments, the first and second fiberglass mesh filter layers are primarily made of composite glass fibers. The absorbent filter layer may be made of polypropylene fiber felt. The filter layer may be made of polystyrene fiber filter mesh. The absorbent sock layer may be made of absorbent resin and is disposed as the outermost layer.

[0083] In the embodiments of this application, the two filter media composited within the stainless steel mesh, based on the different tensions between water and oil, create two different speeds for the oil and water to pass through the filter media, allowing the water in the emulsified oil to escape from the oil. The five filter media composited outside the stainless steel mesh exhibit a significant water-absorbing effect, slowing the passage of small water particles that have escaped the oil, allowing them to coalesce into larger droplets. The larger droplets then settle faster. Theoretically, the settling speed of a 1mm droplet is 0.2857mm / s, while that of a 3mm droplet reaches 0.8573mm / s, a threefold increase.

[0084] In some embodiments, the initial pressure resistance of the demulsification filter element is less than 0.2 MPa.

[0085] The piezoresistance of demulsification filter element is calculated as follows: , where P is the pressure resistance of a single filter layer, λ is the flow resistance coefficient. In the embodiment of the present application, the flow resistance coefficient of ultra-high viscosity index hydraulic oil λ=50, v is the fluid flow rate, d is the maximum pore size of the filter material, the precision of the first filter material layer is 10μm, and d=10μm; In the embodiment of the present application, v = 0.0094 m / s; ; According to the piezoresistance of a single layer of filter media and the arrangement of the filter media structure, the piezoresistance calculation results of the demulsification filter element are as follows: For a filter element with a stacked filter media structure, the number of filter media layers required to meet the long channel requirements is 15, and the piezoresistance is 221*15=3315Pa=0.03315Mpa, which is less than the initial piezoresistance of 0.2Mpa.

[0086] In the embodiments of the present application, the stainless steel mesh of the stainless steel mesh composite glass fiber filter material is made of stainless steel. In some embodiments, 022Cr17Ni12Mo2 is used, which has the advantages of high hardness, high strength, and easy cleaning. It can filter impurities and demulsify, and is convenient for maintenance and replacement. In the embodiments of the present application, the demulsification filter element is in the form of a stainless steel mesh composite glass fiber filter material with a precision of 10um. It has the characteristics of high strength, high hardness, wear resistance and corrosion resistance, uniform gaps, and good permeability. At the same time, it has lipophilic and hydrophobic effects and long channel effects, and can break 99.99% of the oil-in-water emulsion phenomenon, providing sufficient preparation for the next step of oil-water separation.

[0087] Figure 9 Schematic diagram of the structure of the oil-water separation filter element in some embodiments. Figure 10Schematic diagram of the structure of the oil-water separation membrane in some embodiments. In some embodiments, the oil-water separation filter element is fixed to the second flange 2106 by a pressure plate 2105 and a second pressure plate 2107, and the second pressure plate 2107 is connected to the second flange 2106 by bolts and nuts. A second pull rod 2201 is provided at one end of the oil-water separation filter element. In some embodiments, the oil-water separation filter element includes an oil-water separation membrane 2202. In some embodiments, the oil-water separation membrane is a nanographene mesh, and the contact angle of water on the surface of the nanographene mesh is greater than 150°. In the embodiments of the present application, the oil-water separation filter element adopts a three-dimensional porous nanographene oil-water separation filter element. The three-dimensional porous nanographene oil-water separation filter element is made of nanomaterials and has lipophilic properties. When hydraulic oil containing water passes through the nanographene mesh with oil-water separation function, the hydraulic oil is adsorbed by the super lipophilic substance, allowing the oil molecules to replace each other and pass through. At the same time, the free water contained in the hydraulic oil is repelled by the concave-convex structure of the reticular superhydrophobic material, so that more than 99.99% of the tiny free water droplets in the hydraulic oil cannot pass through. Instead, they accumulate into relatively large water droplets and are separated by sinking due to the specific gravity of oil and water.

[0088] In an embodiment of the present application, the method for preparing the nanographene mesh film includes: Prepare suspension: add polyacrylamine, polyacrylpyrrolidone, graphene powder and polytetrafluoroethylene powder in a mass ratio of 8:62:10:20, stir and disperse into suspension; The suspension is evenly sprayed on a stainless steel wire mesh, and the sprayed stainless steel wire mesh is cured at a curing temperature of 300° C. to form a graphene coating with a thickness of 9-11 μm.

[0089] Specifically, according to the corresponding proportion of the suspension, use a spray gun to spray the suspension evenly at close range on a 200-mesh stainless steel wire mesh under a balanced wind pressure of 0.4MPa, and spray about 3μm at a time. Place the sprayed stainless steel wire mesh in a muffle furnace for curing and keep it at 300℃ for 10 minutes. Repeat the steps three times to make the coating thickness about 10μm. The curing temperature is controlled at 300℃±1℃ and cured on the stainless steel surface. This process requires mastering specific methods to ensure that the integrity of the graphene is not destroyed.

[0090] In the embodiment of the present application, the suspension ratio formula is configured to add polyacrylamine, polypropylene pyrrolidone, graphene powder and polytetrafluoroethylene powder in a mass ratio of 8:62:10:20, and is dispersed into a suspension by a magnetic stirrer. Inaccurate proportions will cause the contact angle to change, and the contact angle will not reach 150°±1°, affecting the effect of the separation network in blocking water droplets. In the embodiment of the present application, the curing temperature is 300°C, which has a great impact on the stability of the graphene coating. Compared to the curing temperature of 350°C, the present application controls the curing temperature at 300°C±1°C, which can ensure the stability of the graphene coating, reduce power consumption and save costs.

[0091] Specifically, in some embodiments, the method for preparing the nanographene mesh film includes: Take 200-mesh stainless steel mesh, cut it by hand, the size is 500±1mmx1000±1mm, the diagonal tolerance is 1mm, and the burrs and sharp corners are removed.

[0092] In a single-layer glass reactor, add 14.4 kg of anhydrous ethanol (equivalent to 18.35 L of anhydrous ethanol), 917.4 mL of ethyl orthosilicate, and 275.2 mL of deionized water in a volume ratio of 120:6:1.8. Pre-collect 460 mL of ammonia water at a volume ratio of approximately 3, add 400 mL initially, and then slowly add dropwise to raise the pH to 10. Heat in a constant-temperature water bath and stir for 1 hour to prepare 20 L of silica sol.

[0093] The mixture was poured into a 50 L container and repeated twice to prepare a total of 40 L of silica sol.

[0094] 216 g of polyacrylamine, 1674 g of polypropylene pyrrolidone, 270 g of graphene powder, and 540 g of polytetrafluoroethylene powder were weighed in a mass ratio of 8:62:10:20, and 17.3 kg of deionized water were weighed and placed in a single-layer glass reactor. The mixture was stirred at room temperature for 1 hour to prepare a dispersion, which was poured into a 50 L container. This was repeated twice to prepare a total of 40 kg of graphene dispersion, i.e., graphene suspension.

[0095] 200 g of hexadecyltrimethylammonium bromide was placed in 20 L of water and stirred to dissolve for later use. Six pieces of 0.5 m × 1.0 m 200-mesh 316L stainless steel wire mesh were taken.

[0096] The stainless steel mesh was immersed in the prepared hexadecyltrimethylammonium bromide aqueous solution and ultrasonically cleaned for 30 minutes, then rinsed with deionized water at room temperature and air-dried.

[0097] Use a spray gun to spray the graphene suspension evenly on a 180-mesh stainless steel wire mesh at a close distance under a balanced wind pressure of 0.4 MPa, spraying it on both sides.

[0098] Place the sprayed stainless steel wire mesh in a drying oven for curing at 300°C for 10 minutes. The thickness of the sprayed mesh on both sides is approximately 3±0.5μm.

[0099] The steps were repeated three times to make the coating thickness within 9 ± 1.5 μm.

[0100] The spray-coated stainless steel wire mesh is immersed in the silica sol.

[0101] After 5 minutes, take it out and put it into a drying oven for drying at 150°C for 2 hours. Repeat this step three times.

[0102] PDMS is sprayed on the surface of the stainless steel mesh, and the modified stainless steel mesh is calcined at high temperature.

[0103] The temperature is 300℃ and the time is 10 minutes. It serves as a protective layer to prevent falling off, and a stable and firm graphene oil-water separation network is obtained. The coating thickness is 10±1.5μm and the adhesion reaches level 0-1.

[0104] In some embodiments of the present application, a stainless steel mesh-based oil-water separation membrane assembly is also provided, comprising an emulsifying membrane 1204 and an oil-water separation membrane 2202. In some embodiments, the emulsifying membrane is the emulsifying membrane of the emulsifying filter element described in any of the above embodiments. In some embodiments, the oil-water separation membrane is the nanographene mesh membrane of the oil-water separation filter element described in any of the above embodiments.

[0105] The demulsification membrane includes a mesh inner layer, a stainless steel mesh layer, and a mesh outer layer sequentially arranged along a first direction; the mesh inner layer includes a first filter material layer and a second filter material layer sequentially arranged along the first direction, and the precision of the first filter material layer is less than that of the second filter material layer; the mesh outer layer includes a water-absorbing filter material layer, a first glass fiber mesh filter material layer, a filtration filter material layer, a second glass fiber mesh filter material layer, and a water-absorbing sock layer sequentially arranged along the first direction, and the adsorption force of each layer of filter material on water droplets gradually increases from the inside to the outside; refer to Figure 10 The oil-water separation membrane is a nanographene mesh, which includes a stainless steel mesh and a graphene coating cured on the surface of the stainless steel mesh. The contact angle of the oil droplet on the surface of the nanographene mesh is 0°, and the contact angle of water on the surface of the nanographene mesh is greater than 150°. In the embodiments of the present application, the contact angle of the oil droplet on the surface of the nanographene mesh can be in a superwetting state. The measured contact angle is 0±1.3°. It can be understood that the oil droplet has a strong spreading ability on the surface of the nanographene mesh. Not only is it completely wetted (contact angle 0°), but it also further "penetrates" into the pores or grooves of the nanographene mesh due to the surface structure or external force.

[0106] In some embodiments, the precision of the first filter material layer is no greater than 10 μm, and the precision of the second filter material layer is no greater than 35 μm.

[0107] In some embodiments of the present application, an oil-water separation and purification device is further provided. It is understood that the oil-water separation and purification device in the embodiments of the present application can be the ultra-high viscosity index hydraulic oil oil-water separation and purification device in any of the above embodiments. The oil-water separation and purification device includes an oil-water separation membrane assembly based on a stainless steel mesh; the oil-water separation and purification device includes a demulsification filter cartridge body and a separation filter cartridge body; the demulsification filter cartridge body is provided with multiple demulsification filter cartridges, the demulsification filter cartridges including demulsification membranes; the separation filter cartridge body is provided with multiple oil-water separation filter cartridges, the oil-water separation filter cartridges including oil-water separation membranes.

[0108] In some embodiments of the present application, the oil-water separation and purification device itself does not have a pressurizing device.

[0109] In some embodiments of the present application, the oil-water separation and purification device includes a communication device, wherein the communication device includes a lower communication pipe, the inner diameter of which is larger than the diameter of the oil inlet of the demulsification filter cartridge. It is understood that the lower communication pipe is the second transverse communication pipe in the communication device 3000 in the above embodiment.

[0110] Figure 11 Schematic diagram of an oil-water separation and purification device in some embodiments. Figure 12 Schematic diagram of the oil-water separation and purification method in some embodiments. The oil-water separation and purification method in some embodiments of the present application is carried out using the oil-water separation and purification device in any of the above embodiments. Figure 3 In some embodiments, the oil-water separation and purification device further includes a junction box 9001, a water level switch 9002, a solenoid valve 9003, a flow switch 9004, a ball valve 9005, and the like.

[0111] According to the oil-water separation and purification device in some embodiments of the present application, refer to Figure 12 In some embodiments of the present application, a method for oil-water separation and purification is provided, the method comprising: delivering hydraulic oil to the oil-water separation and purification device at a first flow rate, wherein the first flow rate is the flow rate of the hydraulic oil in the hydraulic oil pipeline; The flow rate is reduced to a second flow rate through the demulsification filter element; The hydraulic oil enters the separation filter cartridge from the demulsification filter cartridge, and the flow rate increases to a third flow rate; The flow rate is reduced to the fourth flow rate after passing through the oil-water separation filter element, completing the oil-water separation and purification.

[0112] In the embodiment of the present application, the second flow rate V2 is less than the first flow rate V1, the third flow rate V3 is greater than the second flow rate V2, and the fourth flow rate V4 is less than the third flow rate V3. In some embodiments, the first flow rate V1, the second flow rate V2, the third flow rate V3, and the fourth flow rate V4 satisfy the relationship In the embodiments of the present application, , which can prevent the oil from accumulating and clogging in the oil-water separation and purification device, thereby forming an excessive pressure difference. In some embodiments, In the embodiment of the present application, the dimensions of the second transverse connecting pipe, the first transverse connecting pipe, the oil inlet and the oil outlet, etc., as well as the precise calculation and setting of the oil-water separation membrane assembly, are used to ensure that .

[0113] In some embodiments, the first flow velocity is 0.015-0.016 m / s, the second flow velocity is 0.0023-0.0027 m / s, the third flow velocity is 0.0046-0.0054 m / s, and the fourth flow velocity is 0.0023-0.0027 m / s.

[0114] In some embodiments, the method includes: directly delivering the hydraulic oil to the oil inlet of the demulsification filter cartridge within the hydraulic oil pipeline. In the embodiments of the present application, it is understood that the hydraulic oil is directly delivered to the oil inlet of the demulsification filter cartridge within the hydraulic oil pipeline means that the oil-water separation and purification device itself no longer has a pressure pump, etc., and the hydraulic oil is directly delivered to the oil inlet cavity of the demulsification filter cartridge within the hydraulic oil pipeline, and then enters the demulsification filter cartridge.

[0115] In some embodiments, the viscosity index of the hydraulic oil is not less than 180. As described above, the oil-water separation and purification device of the present application is an ultra-high viscosity index hydraulic oil oil-water separation and purification device.

[0116] In some embodiments, the method includes: preventing more than 99.99% of free water droplets from passing through the oil-water separation membrane, accumulating them into larger water droplets, and separating them by sinking due to the fact that water is heavier than oil.

[0117] In the embodiment of the present application, water-containing hydraulic oil is pumped from the hydraulic oil tank through the oil inlet into the demulsifier filter cartridge via the hydraulic system's pump. The oil then enters the demulsifier filter cartridge. The unique structure of the demulsifier filter material causes small water droplets within the emulsified oil (i.e., water-in-oil) to break free from the oil and coalesce into larger droplets. The hydraulic oil and water droplets then flow out of the demulsifier filter cartridge, through a connecting device, and into the oil-water separator cartridge within the separator cartridge. Due to the oleophilic and hydrophobic properties of the three-dimensional porous graphene interface, 99.99% of the water droplets are trapped outside the oil-water separator cartridge. The droplets then coalesce into larger droplets and flow toward the sewage tank. When the water level reaches a certain level, the water level switch senses a high water level and issues a high water level indication signal, controlling the drain solenoid valve to open and discharge the sludge. When the water level reaches a certain level, the water level switch senses a low water level and disconnects the indication signal, closing the drain solenoid valve. The hydraulic oil flows from the outside of the oil-water separator cartridge into the inside of the oil-water separator cartridge, then flows back into the tank through the oil outlet.

[0118] The oil-water separation and purification device is equipped with a water level switch, a pressure differential switch, an oil level switch (high oil level switch and low oil level switch), pressure gauges (first pressure gauge and second pressure gauge) and a flow switch. It automatically drains water when the water level is high, indicates when the oil level is high, and alarms when the pressure differential between the hydraulic oil inlet and outlet is high, when there is a drainage failure, when there is oil leakage and when the oil level is low.

[0119] Some embodiments of the present application further provide a hydraulic system comprising the oil-water separation and purification device described in any of the above embodiments. It is understood that the oil-water separation and purification device is used to separate and purify the hydraulic oil in the hydraulic system. Dirty oil from the hydraulic system enters the oil-water separation and purification device, which then outputs clean oil after separation and purification. This enables the recycling of the hydraulic oil.

[0120] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An oil-water separation membrane assembly based on stainless steel mesh, characterized in that: The oil-water separation membrane assembly includes an emulsification membrane and an oil-water separation membrane; The demulsification membrane includes a mesh inner layer, a stainless steel mesh layer, and a mesh outer layer sequentially arranged along a first direction; the mesh inner layer includes a first filter material layer and a second filter material layer sequentially arranged along the first direction, and the precision of the first filter material layer is less than that of the second filter material layer; the mesh outer layer includes a water-absorbing filter material layer, a first glass fiber mesh filter material layer, a filtration filter material layer, a second glass fiber mesh filter material layer, and a water-absorbing sock layer sequentially arranged along the first direction, and the adsorption force of each layer of filter material on water droplets gradually increases from the inside to the outside; The oil-water separation membrane is a nanographene mesh membrane, which includes a stainless steel mesh and a graphene coating cured on the surface of the stainless steel mesh. The contact angle of oil droplets on the surface of the nanographene mesh membrane is 0°, and the contact angle of water on the surface of the nanographene mesh membrane is greater than 150°.

2. The oil-water separation membrane assembly according to claim 1, characterized in that: The precision of the first filter material layer is no more than 10 μm, and the precision of the second filter material layer is no more than 35 μm.

3. An oil-water separation and purification device, characterized in that: The oil-water separation and purification device comprises the oil-water separation membrane assembly based on stainless steel mesh according to any one of claims 1 to 2; The oil-water separation and purification device includes a demulsification filter cartridge and a separation filter cartridge; The demulsification filter cartridge is provided with a plurality of demulsification filter cartridges in the cartridge body, and the demulsification filter cartridges include demulsification membranes; A plurality of oil-water separation filter elements are arranged in the separation filter element cylinder, and the oil-water separation filter element includes an oil-water separation membrane.

4. The oil-water separation and purification device according to claim 3, characterized in that: The oil-water separation and purification device itself does not have a pressurizing device.

5. The oil-water separation and purification device according to claim 4, characterized in that: The oil-water separation and purification device comprises a connecting device, which comprises a lower connecting pipe. The inner diameter of the lower connecting pipe is larger than the diameter of the oil inlet of the demulsification filter cylinder.

6. A method for oil-water separation and purification using the oil-water separation and purification device according to any one of claims 3 to 5, characterized in that: The method comprises: delivering hydraulic oil to the oil-water separation and purification device at a first flow rate, wherein the first flow rate is the flow rate of the hydraulic oil in the hydraulic oil pipeline; The flow rate is reduced to a second flow rate through the demulsification filter element; The hydraulic oil enters the separation filter cartridge from the demulsification filter cartridge, and the flow rate increases to a third flow rate; The flow rate is reduced to the fourth flow rate after passing through the oil-water separation filter element, completing the oil-water separation and purification.

7. The method for oil-water separation and purification according to claim 6, characterized in that: The first flow rate V1, the second flow rate V2, the third flow rate V3, and the fourth flow rate V4 satisfy the relationship ; Preferably, , the first flow velocity is 0.015-0.016 m / s, the second flow velocity is 0.0023-0.0027 m / s, the third flow velocity is 0.0046-0.0054 m / s, and the fourth flow velocity is 0.0023-0.0027 m / s.

8. The method for oil-water separation and purification according to claim 7, characterized in that: The method comprises the following steps: the hydraulic oil is directly delivered to the oil inlet of the demulsification filter cylinder in a hydraulic oil pipeline.

9. The method for oil-water separation and purification according to claim 7, characterized in that: The viscosity index of the hydraulic oil is not less than 180.

10. The oil-water separation and purification method according to claim 7, characterized in that: The method comprises: preventing more than 99.99% of free water droplets from passing through the oil-water separation membrane, accumulating them into larger water droplets, and separating them by sinking due to the fact that water is heavier than oil.

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