Bare electrode and solenoid combined tubular electromagnetic field composite demulsification device

Abstract

The utility model discloses a bare electrode and solenoid combined tubular electromagnetic field composite demulsification device. Comprising a main pipe body, an in-pipe grounding electrode plate, an in-pipe power supply bare electrode, an in-pipe bare electrode insulation supporting piece, a watertight through-pipe electric connection terminal, a solenoid which is arranged outside the pipe and takes the main pipe body as an axis, a heat insulation protection layer of the main pipe body and the solenoid, and an out-pipe solenoid explosion-proof pipe shell. Independent spaces with basically-closed peripheries are defined between the grounding electrode plates and the main pipe body and between the adjacent grounding electrode plates, fluid channels are formed, at least one power supply bare electrode is arranged in each independent space, the power supply bare electrodes, the main pipe body and the grounding electrode plates are arranged at intervals, and fluid flows in from any end of the pipeline and flows out from the other end of the pipeline. When dispersed-phase water particles of crude oil emulsion flow through the demulsification device, the particle size of the dispersed-phase water particles is increased after the dispersed-phase water particles are coalesced and collided under the combined action of an appropriate turbulent flow, an electric field and an electric field and a magnetic field generated by the solenoid, and the demulsification effect is improved. The problems that an emulsion breaker is complex in structure and poor in emulsion breaking effect are solved.

Description

Technical Field

[0001] This utility model relates to an electromagnetic field demulsification device for petroleum technology, and more particularly to a tubular electromagnetic field composite demulsification device combining a bare electrode and a solenoid. Background Technology

[0002] Whether in upstream crude oil extraction or downstream petrochemicals, the demulsification and dehydration of water-in-oil (W / O) emulsions is a frequent problem. Commonly used demulsification methods for W / O emulsions include thermal demulsification, chemical demulsification, and electric field demulsification. Among these, electric field demulsification is widely used due to its advantages such as high efficiency, environmental friendliness, and energy saving. The commonly used electric field demulsification and dehydration equipment is the electric dehydrator, which combines the electric field demulsification process with gravity sedimentation. To ensure smooth gravity sedimentation, conventional electric dehydrators maintain a laminar flow state inside the tank, but this contradicts the principle of promoting the collision and aggregation of dispersed water particles through appropriate turbulence.

[0003] To address the aforementioned issues, researchers have proposed separating the electric field demulsification process from the gravity sedimentation process. This involves performing electric field demulsification first, followed by gravity sedimentation to separate the oil and water. Insulated electrodes are used in the electric field demulsification process to prevent water chains from forming between the electrodes and causing short circuits when the water content is high. For example, in 2023, Zhang Baosheng et al. from Beijing Institute of Petrochemical Technology proposed an electric field demulsifier. This demulsifier includes an electric field demulsification section, an inlet section for the emulsion to flow in, and an outlet section for the emulsion to flow out. The electric field demulsification section includes a shell containing a grounded electrode plate and a high-voltage insulated electrode electrically connected to a power source.

[0004] The aforementioned prior art has at least the following problems:

[0005] Demulsifiers require insulated high-voltage electrodes, have a complex structure, are difficult to install and manufacture, and are prone to problems such as breakdown.

[0006] In view of the above, this utility model is hereby proposed. Summary of the Invention

[0007] The purpose of this invention is to provide a tubular electromagnetic field composite demulsification device that combines a bare electrode with a solenoid, so as to solve the above-mentioned technical problems existing in the prior art.

[0008] The objective of this utility model is achieved through the following technical solution:

[0009] The present invention relates to a tubular electromagnetic field composite demulsification device combining a bare electrode and a solenoid, comprising a main body 5, a medium-low voltage electric field demulsification electrode assembly 4 inside the main body 5, a solenoid 3 around the main body 5 as an axis outside the main body 5, a heat insulation protective layer 6 between the main body 5 and the solenoid 3, a flange 1 and a metal fixing ring 7 respectively at both ends of the main body 5, and a watertight joint 2 on one side wall of the main body 5.

[0010] The medium-low voltage electric field demulsification electrode assembly 4 includes a grounding electrode plate 23, a bare electrode 22, an electrode insulating support 21, and a watertight pipe-through electrical connection terminal. The electrode insulating support 21 includes a metal support 24, and an insulating support 25 is provided inside the metal support 24.

[0011] The grounding electrode plate 23 and the main body 5 and adjacent grounding electrode plates 23 form an independent space with four closed sides and a fluid channel. At least one bare electrode 22 is provided in each independent space, and the bare electrode 22 is arranged at intervals with the main body 5 and the grounding electrode plate 23.

[0012] Compared with existing technologies, the tubular electromagnetic field composite demulsifier combining bare electrodes and solenoids provided by this utility model addresses the problem of crude oil demulsification and separation. It adopts the principle of first performing electro-magnetic field demulsification and then performing oil-water gravity sedimentation separation. The bare electrode and solenoid combination is set in the liquid inlet section of the three-phase separator or electrostatic dehydrator to realize the demulsification and aggregation process of dispersed phase water particles. It can also be combined with demulsifiers to enhance the chemical demulsification effect, improve oil-water separation efficiency, and significantly shorten the processing time.

[0013] When the tubular electromagnetic field composite demulsifier combining bare electrode and solenoid in this invention processes emulsion, the low-voltage electric field directly generated by the bare electrode, along with the electric and magnetic fields generated by the solenoid, work together. Compared with other high-voltage insulated electrode demulsifiers, the newly built equipment has a simpler structure and lower cost, while improving the demulsification and coalescence efficiency. Attached Figure Description

[0014] Figure 1 A schematic diagram of the structure of the tubular electromagnetic field composite demulsification device combining a bare electrode and a solenoid provided in an embodiment of this utility model;

[0015] Figure 2 A schematic diagram of the structure of the medium and low voltage electric field demulsification electrode assembly provided in this embodiment of the utility model;

[0016] Figure 3 A schematic diagram of the plate electrode insulating support structure provided in this embodiment of the utility model;

[0017] Figure 4 A schematic diagram of the main body structure of the T-shaped tube for liquid inlet and outlet provided in an embodiment of this utility model;

[0018] Figure 5a , Figure 5b These are front and side views of the insulating support component for the power supply electrode at the end of the main body of the T-shaped tube during liquid inlet and outlet, provided in an embodiment of this utility model.

[0019] Figure 6A schematic diagram showing the positions of the bare electrode and the ground electrode when the independent spatial cross-section is an equilateral triangle, provided for an embodiment of this utility model;

[0020] Figure 7 A schematic diagram showing the positions of the bare electrode and the ground electrode when the independent space cross-section is square, provided for an embodiment of this utility model;

[0021] Figure 8 A schematic diagram showing the positions of the bare electrode and the ground electrode when the independent spatial cross-section is a regular polygon, provided for an embodiment of this utility model;

[0022] Figure 9 Schematic diagram of the arrangement of the grounding electrode and the power supply electrode tube provided in the embodiment of this utility model Figure 1 ;

[0023] Figure 10 Schematic diagram of the arrangement of the grounding electrode and the power supply electrode tube provided in the embodiment of this utility model Figure 2 ;

[0024] Figure 11 Schematic diagram of the arrangement of the grounding electrode and the power supply electrode tube provided in the embodiment of this utility model Figure 3 .

[0025] The meanings represented by each mark in the diagram are as follows:

[0026] 1-Metal flange, 2-Watertight joint, 3-Solenoid, 4-Medium and low voltage electric field demulsification electrode assembly, 5-Main body, 6-Heat insulation layer, 7-Metal retaining ring;

[0027] 21-Electrode insulation support, 22-Bare electrode connected to the power supply system, 23-Grounding electrode plate, 24-Metal support, 25-Insulation support. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments, which do not constitute a limitation on the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0029] First, the following explanations are provided for the terms that may be used in this article:

[0030] The term "and / or" means that either or both can be achieved simultaneously. For example, X and / or Y means that it includes both "X" or "Y" as well as the three cases of "X and Y".

[0031] The terms "comprising," "including," "containing," "having," or other similar semantic descriptions should be interpreted as non-exclusive inclusion. For example, including a technical feature element (such as raw material, component, ingredient, carrier, dosage form, material, size, part, component, mechanism, device, step, process, method, reaction conditions, processing conditions, parameter, algorithm, signal, data, product or article of manufacture, etc.) should be interpreted as including not only the expressly listed technical feature element, but also other technical feature elements that are not expressly listed and are well-known in the art.

[0032] The term "composed of" excludes any technical features not expressly listed. When used in a claim, it closes the claim to exclude all technical features other than those expressly listed, except for associated conventional impurities. If the term appears only in a clause of a claim, it limits the claim to the elements expressly listed in that clause; elements recited in other clauses are not excluded from the overall claim.

[0033] Unless otherwise explicitly specified or limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this document according to the specific circumstances.

[0034] The terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” and “counterclockwise” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience and simplification of description and do not imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this document.

[0035] The contents not described in detail in the embodiments of this utility model are existing technologies known to those skilled in the art. Where specific conditions are not specified in the embodiments of this utility model, they shall be performed according to conventional conditions in the art or conditions recommended by the manufacturer. Reagents or instruments used in the embodiments of this utility model whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0036] The present invention relates to a tubular electromagnetic field composite demulsification device combining a bare electrode and a solenoid, comprising a main body 5, a medium-low voltage electric field demulsification electrode assembly 4 inside the main body 5, a solenoid 3 around the main body 5 as an axis outside the main body 5, a heat insulation protective layer 6 between the main body 5 and the solenoid 3, a flange 1 and a metal fixing ring 7 respectively at both ends of the main body 5, and a watertight joint 2 on one side wall of the main body 5.

[0037] The medium-low voltage electric field demulsification electrode assembly 4 includes a grounding electrode plate 23, a bare electrode 22, an electrode insulating support 21, and a watertight pipe-through electrical connection terminal. The electrode insulating support 21 includes a metal support 24, and an insulating support 25 is provided inside the metal support 24.

[0038] The grounding electrode plate 23 and the main body 5 and adjacent grounding electrode plates 23 form an independent space with four closed sides and a fluid channel. At least one bare electrode 22 is provided in each independent space, and the bare electrode 22 is arranged at intervals with the main body 5 and the grounding electrode plate 23.

[0039] The cross-section of the independent space is an equilateral triangle, a regular polygon, or a rectangle;

[0040] The bare electrode 22 connected to the power supply system is a plate, rod, or hollow rod. The electrode insulation support 21 ensures that there is a certain gap between the bare electrode 22 and all main bodies 5 and the grounding electrode plate 23, and that the gaps are the same.

[0041] The demulsifier is arranged horizontally or vertically and connected to the crude oil processing flow. Fluid flows in from one end of the demulsifier and out from the other end.

[0042] All grounding electrode plates 23 are directly fixed to and electrically connected to the main body 5. All bare electrodes 22 are connected together by wires and led out of the pipe through the watertight connector 2. All exposed wires are spaced apart from the grounding electrodes or filled with insulating material.

[0043] The bare electrode 22 is powered separately from the solenoid 3; or, the bare electrode 22 is powered through the solenoid 3.

[0044] When the bare electrode 22 is powered alone, a rectangular wave power supply method is used, with a power supply voltage between 10V and 2kV, a pulse frequency between 500Hz and 250kHz, and a power supply commutation frequency between 50Hz and 5kHz.

[0045] The current change rate of the solenoid power supply is ≥10A / us, the voltage is between 10V and 2kV, the power supply frequency adjustment range is between 500Hz and 250kHz, the solenoid power supply frequency adopts various optimized composites of different frequencies, and the solenoid power supply voltage waveform can be a rectangular wave, an AC square wave, or a frequency agile.

[0046] All of the above adjustments are designed to adapt to the specific demulsification processes required for crude oils with different properties.

[0047] Alternatively, when power is supplied to the bare electrode 22 through the solenoid 3, the power supply should be based on the power supply characteristics of the bare electrode 22, and the current change rate should be ≥10A / us.

[0048] The solenoid 3 is provided with an explosion-proof casing.

[0049] The composite demulsifier has dedicated areas at both ends for arranging the electrode insulation support 21 inside the tube, and T-shaped tubes are respectively installed at the positions adjacent to these areas at both ends for the liquid to be treated to pass through.

[0050] In summary, the tubular electromagnetic field composite demulsifier combining bare electrodes and solenoids of this utility model solves the problems of complex demulsifier structures and poor demulsification effects. The demulsifier includes a main pipe, an internal grounding electrode plate, an internal power supply bare electrode, an internal bare electrode insulating support, a watertight through-pipe electrical connection terminal, an external solenoid with the main pipe as its axis, a heat insulation layer between the main pipe and the solenoid, and an explosion-proof shell for the external solenoid. A basically enclosed independent space is formed between the grounding electrode plate and the main pipe, and between adjacent grounding electrode plates, creating a fluid channel. At least one power supply bare electrode is installed in each independent space. The power supply bare electrode, the main pipe, and the grounding electrode plate are arranged at intervals. Fluid flows in from one end of the pipe and out from the other. This device is simple to manufacture and easy to maintain. When the dispersed phase water particles of crude oil emulsion flow through this demulsifier, under the combined action of appropriate turbulence, electric field, and the electric and magnetic fields generated by the solenoid, the dispersed phase water particles aggregate and collide, increasing their particle size and improving the demulsification effect.

[0051] This device is installed in the inlet section of a three-phase separator or an electric dehydrator, which can significantly improve separation efficiency and is suitable for retrofitting and upgrading old equipment and processes.

[0052] To more clearly demonstrate the technical solution and effects provided by this utility model, the following detailed description of the embodiments of this utility model is provided with reference to specific examples.

[0053] The main equipment involved in this utility model includes a pipeline, a medium-low voltage electric field demulsification electrode system, and an external solenoid demulsification system. After pretreatment, the crude oil produced fluid to be processed enters the pipeline body of the tubular electromagnetic field composite demulsification device, which combines bare electrodes and solenoids. Under the combined action of electromagnetic fields, the crude oil produced fluid undergoes efficient demulsification and then flows to the next stage through the pipeline. The tubular electromagnetic field composite demulsification device of this utility model, which combines bare electrodes and solenoids, uses the medium-low voltage electric field generated by the bare electrodes and the electric and magnetic fields generated by the fast-changing solenoid current to perform a combined and efficient demulsification effect on the crude oil emulsion in the pipeline. The bare electrode is powered by a rectangular wave, with the power supply voltage adjustable between 10V and 2kV, and the pulse frequency adjustable between 500Hz and 250kHz. To prevent corrosion of the bare electrode, the power supply commutation frequency is adjustable between 50Hz and 5kHz. The current change rate of the solenoid power supply is ≥10A / µs, with higher change rates yielding better results. The voltage is adjustable between 10V and 2kV. The solenoid power supply frequency adjustment range is between 500Hz and 250kHz, and various optimized combinations of different frequencies can be used. The solenoid power supply voltage waveform can be a rectangular wave, an AC square wave, or a frequency-agile wave. All of the above adjustment methods are designed to adapt to targeted demulsification of crude oils with different properties. When powering the bare electrode through the solenoid, the power supply should be supplied according to the solenoid power supply characteristics, but the current change rate must be ≥10A / µs.

[0054] This invention can, on the one hand, adjust the power supply characteristics of the bare electrode and solenoid according to the state and properties of the crude oil emulsion; on the other hand, it can also use a cascade method to increase the demulsification residence time. Example

[0055] like Figures 1 to 11 As shown,

[0056] A tubular electromagnetic field composite demulsifier combining a bare electrode and a solenoid can be installed before a traditional crude oil electrostatic dehydrator to enhance the demulsification effect and reduce the oil content of the original equipment, depending on the application scenario. It can also be used as a standalone demulsifier, installed before a three-phase separator, electrostatic dehydrator, settling tank, etc., to provide efficient crude oil demulsification. Additionally, it can be installed in the mixing section of the demulsifier addition process to enhance the chemical demulsification function of the demulsifier.

[0057] After being processed in the previous stage, the crude oil produced fluid enters the main body of the unit through a metal flange, passes through the medium and low voltage electric field demulsification electrode system and the external solenoid demulsification system, and then enters the next stage of crude oil processing equipment.

[0058] Traditional tank-type crude oil demulsification equipment is not suitable for emulsions with high water content and high conductivity when using bare electrodes, as it is prone to cross-electric field phenomena. When using insulated electrodes to process emulsions with high water content, it is prone to electrode insulation failure and other malfunctions. Once a failure occurs, the equipment often needs to be shut down and professional tank operators are required to replace the electrodes, which will cause certain economic losses and high maintenance costs.

[0059] The tubular electromagnetic field composite demulsifier combining bare electrodes and solenoids directly uses metal electrodes to avoid a series of problems such as manufacturing difficulties and complex installation caused by high voltage insulation. The equipment has high stability and low cost of later upgrades and maintenance.

[0060] In this embodiment, the schematic diagram of the tubular electromagnetic field composite demulsification device combining the bare electrode and the solenoid is shown below. Figure 1 As shown, it includes a metal flange 1, a watertight connector 2, a solenoid coil 3, a medium-low voltage electric field demulsification electrode assembly 4, a main body 5, a heat insulation protective layer 6, and a metal retaining ring 7. A schematic diagram of the low-voltage electric field demulsification electrode assembly 4 is shown below. Figure 2 As shown, it includes a plate-type electrode insulating support 21, a plate-type power supply electrode 22, and a plate-type grounding electrode 23, both of which are metal plates. Figure 3 As shown, the electrode insulation support 21 consists of a metal support 24 and an insulation support 25. The external solenoid demulsification system 3 includes an external solenoid with the main body as its axis, a heat-insulating protective layer between the main body and the solenoid, and an explosion-proof shell for the external solenoid. If an explosion-proof shell is not used, the solenoid can be formed by winding a conductor inside an explosion-proof flexible conduit. The insulating material can be perfluoroethylene propylene, polytetrafluoroethylene, epoxy resin, polyethylene, polypropylene, etc.

[0061] In the medium-low voltage electric field demulsification electrode system, all grounding electrode plates can be directly fixed to the main body and effectively electrically connected. All bare electrodes inside the pipe can be simply connected together by wires and led out of the pipe through the watertight pipe electrical connection terminal. However, it is necessary to ensure that all exposed wires have a certain distance from the grounding electrode or be filled with insulating material to ensure withstand voltage.

[0062] Furthermore, in the aforementioned low-voltage electric field demulsification electrode system, the adjacent grounding electrode plates and the main pipe body enclose a generally enclosed independent space with a cross-section of various shapes such as equilateral triangles, regular polygons, and rectangles. The grounding electrodes can all be welded to the main pipe body. The bare electrodes connecting the power supply system can be rods or hollow rods, among other shapes. A schematic diagram of the power supply electrode positions is shown when the grounding electrode cross-section is an equilateral triangle. Figure 6 As shown;

[0063] When the cross-section is square, the position diagram of the power supply electrode is as follows: Figure 7 As shown;

[0064] When the cross-section is a regular polygon, the position diagram of the power supply electrode is as follows: Figure 8 As shown.

[0065] To ensure that there is a certain gap between the bare electrode and all main bodies and grounding electrode plates, and that the gaps are approximately the same, the following is adopted: Figure 5a , Figure 5b The insulating support shown is supported at the ends, and as shown in 4, T-shaped pipes are respectively set at both ends adjacent to this area for the liquid to be treated to pass through.

[0066] like Figure 9 , 10 As shown in Figure 11, there are multiple arrangements between the bare electrode rod and the insulating electrode.

[0067] The bare electrode is powered by a rectangular wave, with the power supply voltage adjustable between 10V and 2kV, and the pulse frequency adjustable between 500Hz and 250kHz. To prevent corrosion of the bare electrode, the power supply commutation frequency is adjustable between 50Hz and 5kHz. The current change rate of the solenoid power supply is ≥10A / µs, with higher change rates yielding better results. The voltage is adjustable between 10V and 2kV. The solenoid power supply frequency adjustment range is between 500Hz and 250kHz, and various optimized combinations of different frequencies can be used. The solenoid power supply voltage waveform can be a rectangular wave, an AC square wave, or a frequency-agile wave. All of the above adjustment methods are designed to adapt to targeted demulsification of crude oils with different properties. When powering the bare electrode through the solenoid, the power supply should be supplied according to the solenoid power supply characteristics, but the current change rate must be ≥10A / µs.

[0068] Compared with other similar devices in the field, this utility model has the following advantages:

[0069] 1. For the demulsification and separation of crude oil emulsions, compared with traditional tank-type crude oil processing units, the tubular electromagnetic field composite demulsification unit with bare electrode and solenoid combination has a simple structure, low construction or modification cost, and low maintenance cost and difficulty.

[0070] 2. The tubular electromagnetic field composite demulsifier combining bare electrodes and solenoids, compared with traditional crude oil processing devices, not only uses the electric field formed by the electrodes to achieve the demulsification of crude oil emulsions, but also uses the magnetic field generated by the rapidly changing solenoid current and its induced electric field to achieve the demulsification of crude oil emulsions, which improves the demulsification efficiency to a certain extent.

[0071] 3. The tubular electromagnetic field composite demulsifier combining bare electrodes and solenoids allows for adjustment of two parameters when processing crude oil emulsions. Firstly, the power supply characteristics of the bare electrode electric field demulsification system can be adjusted; secondly, the power supply characteristics of the external solenoid demulsification system can also be adjusted. This significantly improves the ability of the tubular electromagnetic field composite demulsifier to handle various severely emulsified and difficult-to-process crude oils. Of course, from a cost-saving perspective, the bare electrodes can be powered by the same power supply unit via the solenoid.

[0072] 4. The main body of the tubular electromagnetic field composite demulsification device, which combines bare electrodes and solenoids, is a single pipe, making installation more convenient and flexible. It can be used alone or in series.

[0073] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims. The information disclosed in the background section is intended only to enhance the understanding of the overall background technology of this utility model and should not be construed as an admission or implication in any way that such information constitutes prior art known to those skilled in the art.

Claims

1. A tubular electromagnetic field combined demulsifier with a bare electrode and a solenoid, characterized in that, The device comprises a main pipe (5) in which a low-voltage electric field demulsification electrode assembly (4) is arranged, a solenoid (3) is arranged outside the main pipe (5) with the main pipe (5) as the axis, a heat insulation protective layer (6) is arranged between the main pipe (5) and the solenoid (3), flanges (1) and metal fixing rings (7) are arranged at both ends of the main pipe (5), and a watertight joint (2) is arranged at the side wall of one end of the main pipe (5); The low-voltage electric field demulsification electrode assembly (4) comprises ground electrode plates (23), bare electrodes (22), electrode insulation support members (21), and watertight pipe-through electric connection terminals, the electrode insulation support members (21) comprise metal support members (24) in which insulation support members (25) are arranged; The ground electrode plates (23) and the main pipe (5) and adjacent ground electrode plates (23) surround independent spaces which are closed on four sides and form fluid channels, at least one bare electrode (22) is arranged in each independent space, and the bare electrodes (22) are arranged at intervals between the main pipe (5) and the ground electrode plates (23).

2. The tubular electromagnetic field combined demulsifier of bare electrode and solenoid according to claim 1, characterized in that, The cross section of the independent space is a regular triangle, a regular polygon or a rectangle; The bare electrodes (22) are in the form of plates, rods or hollow rods, and the electrode insulation support members (21) ensure that the bare electrodes (22) have a certain gap and the same gap with all the main pipe (5) and the ground electrode plates (23).

3. The tubular electromagnetic field combined demulsifier of bare electrode and solenoid combination according to claim 2, characterized in that, The demulsification device is arranged horizontally or vertically, is connected to a crude oil treatment process, and fluid flows into one end and flows out from the other end.

4. The tubular electromagnetic field combined demulsifier of bare electrode and solenoid according to claim 3, characterized in that, All the ground electrode plates (23) are directly fixed and electrically connected with the main pipe (5), all the bare electrodes (22) are connected together by wires and led out of the pipe through the watertight joint (2), and all the bare wires have a certain spacing or are filled with insulation materials with the ground electrodes.

5. The tubular electromagnetic field combined demulsifier of bare electrode and solenoid combination according to claim 4, characterized in that, The bare electrodes (22) are separately powered by the solenoid (3); or the bare electrodes (22) are powered by the solenoid (3).

6. The tubular electromagnetic field combined demulsifier with a bare electrode and a solenoid according to any one of claims 1 to 5, characterized in that, An explosion-proof pipe shell is arranged outside the solenoid (3).

7. The tubular electromagnetic field combined demulsifier of bare electrode and solenoid combination according to claim 6, characterized in that, The composite demulsification device is provided with special areas for arranging the electrode insulation support members (21) at both ends, and T-shaped pipes are arranged at the positions adjacent to the areas for passing the liquid to be treated.

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