An integrated electrocoalescence diesel water removal filter element

Abstract

The application provides a diesel dewatering filter element integrated with electric coalescence, which comprises a rod-shaped inner electrode, a liquid inlet pipe, a small-pore fiber coalescence layer, a baffle sleeve, a large-pore fiber coalescence layer, a tubular outer electrode, a liquid outlet layer, an outer support framework, a high-voltage electric connector, a low-voltage electric connector, an upper end cover and a lower end cover, wherein the tubular outer electrode is a stainless steel pipe with through holes, and is connected with the low-voltage electric connector of the upper end cover as an outer electrode; the diesel dewatering filter element retains the basic advantages of simple structure and durability of the coalescence filter element, and for the first time integrates the electric field into the coalescence filter element through structural design, so that the electric coalescence and the coalescence filter element are coupled together, the dewatering effect of the coalescence filter element is improved, and the dewatering speed is accelerated.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of petrochemical industry, diesel oil dehydration, oil-water purification and environmental protection equipment, and particularly relates to a diesel oil dehydration filter element integrated with electric coalescence. BACKGROUND

[0002] Diesel oil is one of the main products of petroleum processing and one of the main fuel oils, and the water content is an important indicator of oil quality. The water in the raw oil and the water vapor mixed in the oil processing process can cause the diesel oil to be emulsified with water. The water content of the world fuel specification diesel oil is not more than 500 mg / kg for the first type of diesel oil and not more than 200 mg / kg for the other types. When the water content in the diesel oil exceeds the standard, it will not only affect the normal combustion of the diesel oil, but also aggravate the corrosion and abrasion of the engine.

[0003] At present, there are various methods for oil-water separation, such as gravity sedimentation and inertial separation method, which have large initial investment and equipment area; the membrane separation method has high requirements for the membrane, although the separation efficiency is high, but the cost is large; the centrifugal separation method can realize continuous production, but it has great dependence on the structure of the equipment, and only when it operates under the designed working condition, it can realize high efficiency separation; in addition, the oil-water separation filter element is separated by coalescence dehydration, which has the advantages of compact structure, relatively high efficiency and is widely used.

[0004] However, the coalescence filter element for oil-water separation can only obtain better oil-water separation effect and separation efficiency by improving and adjusting the internal filter element structure to ensure the overall mechanical structure strength and control the size, the type of coalescence filler material is relatively fixed, and the adjustment range of filler density and filter hole size is limited, which will affect the separation effect if too large, and will affect the separation efficiency and easily block if too small, thereby reducing the separation effect. SUMMARY

[0005] Based on the above technical status, the purpose of the present application is to develop a diesel oil deep dehydration equipment with large treatment capacity, high efficiency and low energy consumption, which retains the simple and durable advantages of the coalescence filter element, and for the first time integrates the electric field into the coalescence filter element through structural design, thereby coupling the electric coalescence and the filter element coalescence, improving the dehydration effect of the coalescence filter element and accelerating the dehydration speed.

[0006] To achieve the above purpose, the technical scheme adopted by the present application is as follows: a diesel oil dehydration filter element integrated with electric coalescence, comprising a rod type inner electrode, a liquid inlet pipe, a small-pore fiber coalescence layer, a baffling sleeve, a large-pore fiber coalescence layer, a tubular outer electrode, a liquid outlet layer, an outer support framework, a high-voltage electric connector, a low-voltage electric connector, an upper end cover and a lower end cover, the tubular outer electrode is a stainless steel pipe with through holes, and is connected with the low-voltage electric connector of the upper end cover as an outer electrode.

[0007] The upper end cover and the lower end cover are horizontally arranged and spaced apart vertically, the rod-type inner electrode, the baffle sleeve, the tubular outer electrode and the outer support framework are vertically arranged between the upper end cover and the lower end cover, and the rod-type inner electrode, the liquid inlet pipe, the baffle sleeve, the tubular outer electrode and the outer support framework are concentrically arranged from inside to outside. The upper end of the large-aperture fiber coalescence layer, the baffle sleeve, the tubular outer electrode and the outer support framework is inserted into the upper end cover, but does not directly contact the upper end cover and is isolated by the potting glue. The upper end cover comprises an upper cover plate and an annular upper limiting baffle fixed on the edge of the upper cover plate, and an eccentric low-voltage electrical connector and a centrally arranged high-voltage electrical connector are arranged in the upper end cover, the low-voltage electrical connector is connected with the tubular outer electrode below, the high-voltage electrical connector is connected with the rod-type inner electrode below, and the high-voltage rod-type inner electrode rod generates an electric field with the tubular outer electrode made of stainless steel through a voltage difference. The annular upper limiting baffle wraps the outer circumferential surface of the upper end of the outer support framework, and the upper end cover is filled with potting glue. The potting glue plays a role of sealing, glue filling and insulation, and the annular upper limiting baffle plays a role of radial limiting.

[0008] The lower end of the tubular outer electrode, the large-aperture fiber coalescence layer and the outer support framework is inserted into the lower end cover, but does not directly contact the lower end cover and is isolated by the potting glue. The lower end cover comprises a lower cover plate and an annular lower limiting baffle fixed on the edge of the lower cover plate, the annular lower limiting baffle wraps the outer circumferential surface of the lower end of the outer support framework, and the lower end cover is filled with potting glue, which plays a role of sealing, gluing and filling. The middle part of the lower end cover is provided with a liquid inlet opening penetrating the liquid inlet pipe.

[0009] The dehydration filter element is in a cylindrical shape, and comprises, from inside to outside, a small-aperture fiber coalescence layer, a large-aperture fiber coalescence layer and a liquid discharge layer; the small-aperture fiber filter element is filled between the liquid inlet pipe and the baffle sleeve; the large-aperture fiber coalescence filter element is filled between the tubular outer electrode and the baffle sleeve, and the liquid discharge layer is filled between the tubular outer electrode and the outer support framework. As preferred, the central electrical connector of the upper end cover is fixed with an internally threaded connecting pipe, the upper end of the rod-type inner electrode is an externally threaded bolt, the rod-type inner electrode is threadedly connected with the electrical connector of the upper end cover and the upper end thereof does not contact the upper top surface inside the pipe body. The rod-type inner electrode is a high-voltage electrode rod, which is connected with a high-voltage high-frequency pulse power source through the high-voltage electrical connector. The tubular inner electrode protects and supports the filter material and forms an electric field with the rod-type inner electrode. The tubular outer electrode is grounded through the low-voltage electrical connector. Both electrical connectors are wrapped by a cylindrical ceramic material and are isolated from the upper end cover. The outer support framework is a metal mesh, which protects and supports the filter material, so that the fiber coalescence layer and the oil-water separation fiber layer are not deformed and damaged under the action of pressure difference, can maintain the original shape and improve the mechanical strength, thereby ensuring the oil-water separation effect.

[0010] The fiber coalescing layer is glass fiber, the glass fiber has lipophilicity and hydrophobicity, is wound by multiple layers of glass fiber, and plays a role of coalescing water drops. The liquid discharge layer adopts glass fiber which is subjected to surface treatment and has hydrophilicity and oleophobicity, and plays a role of oil-water separation. The water-containing diesel oil passes through a high-frequency high-voltage electric field composed of a tubular outer electrode and a rod-shaped inner electrode, water drops are coalesced and grown by the action of the electric field, then pass through a small-pore-diameter fiber layer, are coalesced and grown further by a large-pore-diameter fiber coalescing layer, and finally pass through the liquid discharge layer, so that oil and water are separated under the action of gravity, the dehydration efficiency can be effectively improved, the dehydration effect can be ensured to reach the standard, and the pressure drop can be reduced.

[0011] The beneficial effects of the technical scheme of the present application are as follows:

[0012] (1) The high-frequency high-voltage electric field is integrated in the conventional diesel coalescing filter element by structural improvement, the electric coalescing and fiber coalescing synergistically act, the dehydration effect of the coalescing filter element is improved, and the diesel dehydration treatment speed is accelerated.

[0013] (2) The structure shape and size of the conventional coalescing filter element are not changed, the supporting equipment of the existing coalescing filter element does not need to be changed, the universality is stronger, and the application is more conducive to popularization and application; and in the same size space, the electric field action time is prolonged by the fluid baffle flow mode, water drops can be coalesced and grown in the electric field for multiple times, the dehydration efficiency is improved, and the dehydration effect can be ensured to reach the standard.

[0014] (3) The fiber coalescing layers with two different pore sizes are arranged, liquid drops are coalesced from small to large, and compared with the fiber coalescing layer with one pore size, the pressure drop can be reduced, the energy consumption can be reduced, and the large-pore-diameter fiber coalescing layer has better flowability, and can help diesel to flow through the small fiber coalescing layer faster by the pressure difference.

[0015] (4) The tubular outer electrode made of stainless steel material supports and strengthens the overall structure in the inside of the coalescing filter element, and compared with the conventional coalescing filter element which is only supported by the outer support framework, the filter element structure strength is stronger.

[0016] (5) The structure is compact and simple, the manufacturing is convenient, the separation efficiency is high, and the maintenance is simple. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is an outer contour structure schematic diagram of the diesel dehydration filter element integrated with electric coalescing of the present application;

[0018] Figure 2 is a cross-sectional structure schematic diagram of the diesel dehydration filter element integrated with electric coalescing of the present application;

[0019] Figure 3 is an outer electrode contour structure schematic diagram of the diesel dehydration filter element integrated with electric coalescing of the present application;

[0020] In the figure: 1, high-voltage electrical connector, 2, ground electrical connector, 3, upper end cover, 4, outer support framework, 5, lower end cover, 6, liquid inlet pipe, 7, potting glue, 8, small-pore fiber coalescing layer, 9, baffle sleeve, 10, large-pore fiber coalescing layer, 11, tubular outer electrode, 12, liquid discharge layer, 13, rod inner electrode, 14, outer thread of liquid inlet pipe. DETAILED DESCRIPTION

[0021] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0022] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship for the purpose of simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0023] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] Reference Figure 1 is the outer contour structure diagram of the integrated electric coalescing diesel dewatering filter element of the present application. The integrated electric coalescing diesel dewatering filter element of the present application comprises an outer support framework 4 and an upper end cover 3 and a lower end cover 5 covering the upper and lower ends of the outer support framework 4 respectively. The lower end cover 5 is provided with a liquid inlet pipe 6 for water-containing diesel oil to enter the inside of the outer support framework 4. The upper end cover 4 is provided with a high-voltage electrical connector 1 and a ground electrical connector 2 to build an electric field in the space inside the outer support framework 4.

[0025] ReferenceFigure 2 is the cross-sectional structure diagram of the integrated electric coalescence diesel dehydration filter element of the present application, the pipe type outer electrode 11 is arranged in the coaxial center of the outer support framework 4, Figure 3 is the profile structure diagram of the pipe type outer electrode in the integrated electric coalescence diesel dehydration filter element of the present application, as shown in the figure, the pipe type outer electrode 11 is the hollow shell structure uniformly covered with the hollows on the peripheral surface, the upper and lower ends thereof are respectively abutted on the potting glue 7 filled in the inner sides of the upper and lower end covers, and one end of the pipe type outer electrode 11 is connected with the ground electric connector 2 as the low voltage end of the electric field; the baffle sleeve 9 is arranged in the coaxial center of the inner side of the pipe type outer electrode 11, the upper end of the baffle sleeve 9 is fixedly abutted on the potting glue 7 layer in the inner side of the upper end cover 3, and the lower end is spaced apart from the potting glue layer in the inner side of the lower end cover 5 by a distance to form the flow gap; the liquid inlet pipe 6 extends into the inside of the filter element from the lower end cover 5 and into the inside of the baffle sleeve 9, the upper end of the liquid inlet pipe 6 is spaced apart from the potting glue 7 in the inner side of the upper end cover 3 by a distance to form the flow gap; the shaft center position of the liquid inlet pipe 6 is further provided with the rod type inner electrode 13, the rod type inner electrode 13 is connected with the high voltage electric connector 1 as the high voltage end of the electric field, and cooperates with the pipe type outer electrode 11 to form the high frequency high voltage electric field.

[0026] As Figure 2As shown, the annular space between the liquid inlet pipe 6 and the baffle sleeve 9 is filled with the small-pore fiber coalescing layer 8, the annular space between the baffle sleeve 9 and the tubular outer electrode 11 is filled with the large-pore fiber coalescing layer 10, and the annular space between the liquid inlet pipe 6 below the lower end of the baffle sleeve 9 and the tubular outer electrode 11 is also filled with the large-pore fiber coalescing layer 10, that is, the height of the space occupied by the small-pore fiber coalescing layer 8 is the distance between the lower end of the baffle sleeve 9 and the upper end of the liquid inlet pipe 6, and the tubular outer electrode 11 and the outer support framework 4 are provided as a drainage layer 12. The small-pore fiber coalescing layer 8 and the large-pore fiber coalescing layer 10 are both made of glass fiber material and are formed by winding multiple layers of lipophilic and hydrophobic glass fibers, which play a role in coalescing water droplets. Specifically, the pore size of the small-pore fiber coalescing layer 8 is kept at 5-15 μm, such as 8 μm, 12 μm, etc. Due to the presence of electric field force, water droplets are accelerated to coalesce and grow, and the pore size of the large-pore fiber coalescing layer 10 can be set to a relatively large size, preferably 30-90 μm, such as 30 μm, 55 μm, 65 μm, 80 μm, etc. Whether in the small-pore fiber coalescing layer 8 or in the large-pore fiber coalescing layer 10, both have high-frequency high-voltage electric field synergistic coalescing layers that jointly catalyze water droplets to coalesce and grow, which is beneficial to improve the overall dehydration effect and dehydration speed of the filter element. Moreover, the filter element integrates an electric field, the pore size of the large-pore fiber coalescing layer 10 can be set to be much larger than the pore size of the small-pore fiber coalescing layer 8, and can be much larger than the pore size of the coalescing layer of the diesel dehydration coalescing filter element in the prior art, thereby accelerating the dehydration treatment speed and effectively reducing the pressure drop loss relative to conventional diesel dehydration filter elements. The large-pore fiber coalescing layer 10 has a large pore size, which not only can reduce the overall pressure drop of the filter element, but also, due to the fact that the pore size of the large-pore fiber coalescing layer 10 is much larger than the pore size of the small-pore fiber coalescing layer 8, the water-containing diesel can pass through the small-pore fiber coalescing layer 8 with a small pore size more quickly under the pressure difference between the upstream and downstream of the small-pore fiber coalescing layer 8, which alleviates the negative impact of the small pore size on the fluid passing speed, increases the diesel dehydration treatment speed, and, due to the integration of high-frequency high-voltage electric field, the electric field force catalyzes water droplets to coalesce and grow, which improves the dehydration effect of diesel.

[0027] The drainage layer 12 is made of surface-treated glass fiber and has hydrophilic and oleophobic properties to separate oil and water.

[0028] The outer support framework 4, the drainage layer 12, the tubular outer electrode 11, the large-pore fiber coalescing layer 10, the baffle sleeve 9, the small-pore fiber coalescing layer 8, and the liquid inlet pipe 6 are sequentially nested and coaxially arranged from the outside to the inside, and the rod-type inner electrode 13 is arranged at the axial position.

[0029] The upper end cover 3 and the lower end cover 5 are both composed of a cover plate and an annular limiting baffle, the upper end cover 3 is filled with pouring sealant 7, the lower end cover 5 is also filled with pouring sealant 7, the pouring sealant layers at the upper and lower ends cooperate with the end cover to seal and block the upper and lower ends of the filter element, the high-voltage connector 1 is arranged at the center of the upper end cover 3 corresponding to the installation position of the rod-shaped inner electrode 13, and the grounding connector 2 is arranged on the upper end cover 3 eccentrically corresponding to the position of the shell of the tubular outer electrode 11.

[0030] In specific embodiments, the baffle sleeve 9 is made of PVC material, at least the part of the liquid inlet pipe 6 extending into the inside of the lower end cover 5 is made of PVC material, and the outer periphery of the inlet end of the liquid inlet pipe 6 is further provided with a liquid inlet pipe outer thread 14 for connecting with an external oil inlet pipeline, preferably, the liquid inlet pipe 6 is made of PVC material as a whole, or the liquid inlet pipe 6 is composed of a connecting end head outside the lower end cover 5 and a pipe body connected to the connecting end head and extending into the inside of the lower end cover 5, wherein the pipe body is made of PVC material.

[0031] The operation principle of the application is that the water-containing diesel oil enters the inside of the coalescence filter element through the liquid inlet pipe 6 and is in the electric field formed by the rod-shaped inner electrode 13 and the tubular outer electrode 11, the water-containing diesel oil reaches the top of the coalescence filter element through the liquid inlet pipe 6, enters the small-pore-diameter fiber coalescence layer 8 and flows downward under the action of the baffle sleeve 9, and is coalesced and grown under the synergistic action of the small-pore-diameter fiber coalescence layer 8 and the high-frequency high-voltage pulse electric field, reaches the bottom of the coalescence filter element, enters the large-pore-diameter fiber coalescence layer 10 through the overflow gap at the lower end of the baffle sleeve 9, and is further coalesced into large water droplets under the action of the large-pore-diameter fiber coalescence layer 10 and the high-frequency high-voltage pulse electric field, the large water droplets enter the liquid discharge layer 12 after leaving the fiber coalescence layer, and sink under the action of gravity, so as to realize oil-water separation.

[0032] The above describes the specific embodiments of the application in combination with the drawings, but is not a limitation on the protection scope of the application, and those skilled in the art should understand that various equivalent structures or equivalent process modifications or deformations or direct or indirect applications to other related technical fields made by those skilled in the art on the basis of the technical solutions of the application without creative labor are still within the protection scope of the application.

Claims

1. An integrated electrocoalescing diesel water separation cartridge, characterized by, The application relates to a high-voltage high-frequency pulse electrode, which comprises a liquid inlet pipe, a baffle sleeve, a tubular outer electrode and an outer support framework; the baffle sleeve, the tubular outer electrode and the outer support framework are coaxially nested from inside to outside, and the upper and lower end faces of the outer support framework are respectively sealed and fixed by upper and lower end covers; the liquid inlet pipe is coaxially inserted into the baffle sleeve, and the upper end of the liquid inlet pipe is spaced apart from the upper end cover by a distance, and the lower end of the baffle sleeve is spaced apart from the lower end cover by a distance, so that the pipe wall of the liquid inlet pipe and the pipe wall of the baffle sleeve form a baffle channel. A rod-shaped inner electrode is arranged at the axial center position of the liquid inlet pipe, the tubular outer electrode is a metal tube shell structure uniformly covered with hollows on the surface, the rod-shaped inner electrode is connected with a high-voltage power supply, and the tubular outer electrode is connected with the ground. A small-aperture fiber agglomeration layer is filled between the liquid inlet pipe and the baffle sleeve, a large-aperture fiber agglomeration layer is filled between the baffle sleeve and the tubular outer electrode, the aperture size of the large-aperture fiber agglomeration layer is 30-90 mu m, the aperture size of the small-aperture fiber agglomeration layer is 5-15 mu m, and a liquid discharge layer is filled between the tubular outer electrode and the outer support framework.

2. The diesel water separation cartridge of claim 1, further characterized by, The lower end cover comprises a cover plate and a lower limiting annular stopper at the periphery of the cover plate, the upper end cover comprises a cover plate and an upper limiting annular stopper at the periphery of the cover plate, the upper limiting annular stopper and the lower limiting annular stopper are matched with the upper end of the outer support framework respectively, so that the upper and lower end covers are buckled on the upper and lower ends of the outer support framework respectively, the inner parts of the lower end cover and the upper end cover are filled with filling glue, the upper end of the outer support framework, the tubular outer electrode and the baffle sleeve are fixed by the filling glue in the inner part of the upper end cover and are not in direct contact with the upper end cover, and the lower end of the outer support framework and the tubular outer electrode are fixed by the filling glue in the inner part of the lower end cover and are not in direct contact with the lower end cover.

3. The diesel water separation cartridge of claim 1, further characterized by, A high-voltage electric connector and a grounding electric connector are mounted on the upper end cover, the high-voltage electric connector is electrically connected with the rod-shaped inner electrode, and the grounding electric connector is electrically connected with the tubular outer electrode.

4. The diesel water separation cartridge of claim 3, further characterized by, The high-voltage electric connector is arranged at the central position of the upper end cover, the bottom of the high-voltage electric connector is provided with an internally threaded connecting pipe, the upper end of the rod-shaped inner electrode is provided with an externally threaded bolt, and the rod-shaped inner electrode is fixedly mounted on the high-voltage electric connector through thread cooperation.

5. The diesel water separation cartridge of claim 3 or 4, further characterized by, The high-voltage electric connector and the grounding electric connector are both wrapped with a cylindrical ceramic material to be electrically isolated from the upper end cover.

6. The diesel water separation cartridge of claim 1, further characterized by, The high-voltage power supply is a high-voltage high-frequency pulse power supply.

7. The diesel water separation cartridge of claim 1, further characterized by, The outer support framework is a metal wire mesh.

8. The diesel water separation cartridge of claim 1, further characterized by, The material of the baffle sleeve is PVC, and the material of at least the pipe section of the liquid inlet pipe inserted into the inner part of the lower end cover is PVC.

9. The diesel water separation cartridge of claim 1, further characterized by, The small-aperture fiber agglomeration layer and the large-aperture fiber agglomeration layer are both made of lipophilic and hydrophobic glass fiber materials, and the liquid discharge layer is filled with hydrophilic and oleophobic glass fiber materials.

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