Pipeline type superconducting electromagnetic oil-water separation device and implementation method thereof

Abstract

The present application relates to the technical field of oil-water two-phase fluid separation, and particularly relates to a pipeline type superconducting electromagnetic oil-water separation device and an implementation method thereof, which comprises a horizontally arranged flow channel, and an electromagnetic separation zone composed of a winding and a polar plate is arranged on the flow channel; the electromagnetic separation zone is sequentially divided into an upstream auxiliary support zone, a main separation zone and a downstream auxiliary support zone from upstream to downstream. The auxiliary support zones on the upstream and downstream sides are used for automatically balancing the newly added pressure on the upstream and downstream sides of the main separation zone due to electromagnetic force, avoiding the "necking" phenomenon, and ensuring efficient oil-water separation.

Description

Technical Field

[0001] This invention relates to the field of oil-water two-phase fluid separation technology, specifically to a pipeline-type superconducting electromagnetic oil-water separator and its implementation method. Background Technology

[0002] Traditional oil-water separation technology is mainly based on the significant density difference between oil and water, and separates them through gravity sedimentation or centrifugation.

[0003] As oil fields enter the high water-cut period and some difficult-to-move reserves are put into production, especially heavy oil reservoirs, in addition to conventional water injection, steam injection or gas injection, a large amount of polymers and chemical agents are injected in the oil production process. The resulting complex production fluid has the characteristics of high viscosity, high density, high water content, severe emulsification, small oil-water density difference, strong ability to carry solid suspended matter, and large resistance to the floating or sinking of oil droplets and solid particles.

[0004] However, no matter how similar the densities of oil and water are, there is always a huge difference in their electrical conductivity. Oil does not conduct electricity, while water, especially water in highly mineralized solutions, is a good conductor of electricity.

[0005] Actual statistics show that the conductivity of the product liquid is currently between 1.2 and 6.9 S / m, about 100 times that of ordinary water, and roughly equivalent to that of seawater. This lays the foundation for electromagnetic oil-water separation technology. When the product liquid flows through a magnetic field, if a current is passed through it perpendicular to the magnetic field, the water will be subjected to an electromagnetic force, i.e., Lorentz force, while the oil, being non-conductive, will not be subjected to an electromagnetic force. Thus, the oil and water are separated; this is electromagnetic oil-water separation.

[0006] According to the principle of electromagnetic action, the electromagnetic force F exerted on a unit volume of water is proportional to the product of the magnetic induction intensity B and the current density σ, as shown in equation (1).

[0007] F=B×σ (1)

[0008] In the formula, F represents the electromagnetic force per unit volume of water, in N / m³. 3 B is the magnetic flux density, T; σ is the current density, A / m 2 .

[0009] When a superconducting magnet is used, the magnetic induction intensity B can be increased by several times or even tens of times compared to a regular magnet. According to equation (1), this can multiply the electromagnetic separation force and the oil-water separation effect. On the other hand, it can also significantly reduce the required current intensity while satisfying the oil-water separation effect. This not only significantly reduces power consumption, but also effectively weakens the electrochemical reaction and the thermal effect of the current.

[0010] Compared to gravity and centrifugal separation, a significant characteristic of electromagnetic oil-water separation is that the electromagnetic force acts only on the water, and the oil droplets are not directly affected by the electromagnetic force. Therefore, its effective separation force is independent of the density difference between oil and water. In contrast, gravity and centrifugal force act simultaneously on both the water and the oil droplets, and the magnitude of these forces is directly proportional to the densities of oil and water, respectively. Thus, the effective separation force depends entirely on the density difference between oil and water. When the densities of oil and water are similar, the effective separation force decreases significantly. If gravity sedimentation is used for separation in this case, it will inevitably take a very long time to complete. If centrifuges are used, the centrifuge speed needs to be continuously increased, which increases the investment and operating costs of the equipment. Therefore, superconducting electromagnetic separation is more advantageous when the oil and water densities are similar, highlighting its high efficiency, energy saving, and environmentally friendly characteristics.

[0011] Utility model CN201420045662.6 discloses an electromagnetic oil-water processor. This utility model adopts the form of a conventional reaction vessel, which is not easy to directly connect to the actual product liquid pipeline to achieve rapid online separation. In addition, it uses ordinary magnets, which have low magnetic induction intensity, affecting the electromagnetic separation efficiency.

[0012] Chinese patent CN200410098979.7 discloses an online oil-water separation device and method for use in conjunction with an emergency recovery system for offshore crude oil spills to achieve rapid separation of seawater and crude oil. However, it is difficult to operate normally when applied to actual production pipelines.

[0013] The research results in the literature "Experimental Study on Online Oil-Water Separation Using Ultra-Strong Magnetic Fields, Liu Xiaopeng, Master's Thesis, Xi'an Jiaotong University, May 2018" show that as the electromagnetic force gradually increases, a "necking" phenomenon occurs in the separation zone. This means that the fluid in the separation zone contracts downwards, resulting in a free liquid surface in the horizontal flow channel. Above the liquid surface, the fluid is filled with stationary gas, and the actual flow cross-sectional area of ​​the liquid is significantly compressed. In severe cases, the thickness of the remaining liquid layer is less than one-tenth of the channel height, hence the term "necking." The specific morphology is shown in the attached figure. Figure 1 As shown. The reason for this phenomenon is that, due to the lack of corresponding auxiliary support mechanisms on the upstream and downstream sides of the separation zone, when the fluid in the separation zone is subjected to electromagnetic force, that is, when it is in the same direction as gravity, this part of the fluid is equivalent to becoming heavier. The gravity and electromagnetic force are superimposed, and the force on a unit mass of fluid becomes a. m +g, a mElectromagnetic acceleration, defined in equation (2), causes the internal pressure to rise, especially at the bottom of the flow channel, where the pressure is highest, instantly losing the force balance with the upstream and downstream fluids. According to the principle of the connector, the fluid in the separation zone will inevitably begin to migrate from the middle and lower part of the flow channel to the upstream and downstream sides, causing a local low-pressure zone at the top of the flow channel. At this time, the residual and dissolved gases in the liquid, as well as the gases generated during the electrochemical reaction, will aggregate towards the top of the flow channel, eventually causing the liquid surface to continuously sink until a new force balance is achieved with the upstream and downstream fluids. Experiments show that the greater the electromagnetic force, the more severe the "necking".

[0014] The occurrence of "necking" severely interferes with the oil-water separation process. First, it reduces the liquid flow area in the separation zone, leading to a sharp increase in flow velocity and significantly shortening the effective residence time of the fluid in the electromagnetic field, directly affecting the effective separation of oil and water. Second, due to the occurrence of "necking," the product liquid must undergo additional contraction and expansion processes, which disrupts the uniformity of the flow field and causes oil and water to remix and emulsify. In addition, "necking" seriously wastes electromagnetic separation space and limits the further improvement of magnetic induction intensity and current intensity, which not only affects the oil-water separation effect and separation capacity but also directly increases the separation energy consumption. Finally, it is also prone to gas accumulation, especially the accumulation of flammable and explosive gases such as hydrogen and oxygen, affecting the safety of the system. Summary of the Invention

[0015] The technical problem to be solved by this invention is to overcome the shortcomings of the existing technology and provide a pipeline-type superconducting electromagnetic oil-water separation device and its implementation method to achieve efficient and rapid online separation of oil and water in the pipeline.

[0016] The present invention achieves the above objectives through the following technical solutions:

[0017] A pipeline-type oil-water superconducting electromagnetic separation device includes a horizontally arranged flow channel, and an electromagnetic separation zone composed of windings and plates is provided on the flow channel. The electromagnetic separation zone is divided into an upstream auxiliary support zone, a main separation zone, and a downstream auxiliary support zone from upstream to downstream.

[0018] The main separation zone is composed of a main winding sleeved outside the flow channel and a main electrode plate arranged inside the flow channel; the upstream auxiliary support zone and the downstream auxiliary support zone are composed of auxiliary windings arranged outside the flow channel and auxiliary electrode plates arranged inside the flow channel; the auxiliary windings include upstream auxiliary windings and downstream auxiliary windings, and the auxiliary electrode plates include upstream auxiliary electrode plates and downstream auxiliary electrode plates.

[0019] The electromagnetic force generated by the auxiliary winding and auxiliary electrode plate is directed towards the main separation region.

[0020] Furthermore, the main winding includes a superconducting solenoid winding, which is coaxial with the flow channel.

[0021] Furthermore, the main electrode plate includes at least one pair of main positive and negative electrode plates, which are respectively placed on both sides of the flow channel.

[0022] Furthermore, the auxiliary winding includes an upper superconducting coil and a lower superconducting coil, both of which are saddle-shaped superconducting coils, and are arranged symmetrically with respect to the horizontal plane of the flow channel center.

[0023] Furthermore, the auxiliary electrode plate includes at least one pair of auxiliary positive and negative electrode plates.

[0024] Furthermore, the auxiliary electrode plate is an isosceles right triangle, wherein the hypotenuse of the upstream auxiliary electrode plate faces the flow channel inlet, and the hypotenuse of the downstream auxiliary electrode plate faces the flow channel outlet.

[0025] Furthermore, it also includes a power supply, which is an adjustable DC power supply with an output current of DC pulses. The frequency, duty cycle, voltage, or current of the pulses are continuously adjustable, and the power supply is electrically connected to the main electrode plate and the auxiliary electrode plate.

[0026] Furthermore, this includes calculating the minimum length L of the flow channel, using the following formula:

[0027]

[0028] In the formula: H is the channel height, Vx is the average axial velocity, and Vo is the upward migration velocity of the oil droplet.

[0029] Furthermore, the upward migration velocity Vo of the oil droplet is calculated using the following formula:

[0030]

[0031] In the formula: g is the acceleration due to gravity, d is the diameter of the oil droplet; ρo is the density of the oil, μw is the dynamic viscosity of the water, and Fm is the additional electromagnetic acceleration a. m The ratio to the gravitational acceleration g;

[0032] The additional electromagnetic acceleration a m Calculate using the following formula:

[0033]

[0034] In the formula: B is the magnetic flux density, and σ is the current density.

[0035] Furthermore, when the power supply is operating in constant voltage mode, its current density σ is calculated using the following formula:

[0036]

[0037] In the formula: κ is the conductivity of the product liquid, U is the pulse voltage, and D is the distance between the plates;

[0038] When the power supply is selected to operate in constant current mode, its voltage U is calculated using the following formula.

[0039]

[0040] In the formula: I is the pulse current intensity, E a The effective electrode plate area;

[0041] DC power consumption is calculated using the following formula:

[0042] P=I×U×δ

[0043] In the formula: δ is the duty cycle.

[0044] The beneficial effects of this invention are:

[0045] When fluid from the pipeline enters the upstream auxiliary support zone, it is subjected to an electromagnetic force pointing towards the main separation zone. This force balances the increased pressure in the main separation zone caused by the electromagnetic force, and the fluid pressure is increased under this electromagnetic force. Upon entering the main separation zone, the fluid is subjected to a downward electromagnetic force and gravity, achieving oil-water separation. Oil floats at the top of the flow channel, while water accumulates at the bottom, maintaining a clear interface and ultimately forming a stable stratified flow. When leaving the main separation zone and entering the downstream auxiliary support zone, the fluid is subjected to an electromagnetic force in the opposite direction of flow. This force balances the increased pressure in the main separation zone caused by the electromagnetic force, pointing towards the outlet. Simultaneously, under this electromagnetic force, the fluid pressure gradually decreases to the normal pressure within the flow channel before flowing out of the separation system. Throughout the separation process, the main separation zone does not experience "necking" due to the support of the upstream and downstream auxiliary support zones, ensuring efficient oil-water separation. Although the pressure in the separation zone is relatively high, this does not affect the normal flow of fluids upstream and downstream, because the electromagnetic forces in the upstream and downstream auxiliary support zones have automatically balanced the increased pressure in the main separation zone, and the three form a closed electromagnetic force self-balancing system.

[0046] During operation, the voltage or current of the DC power supply can be adjusted in a timely manner according to the separation effect. For example, when the separation effect does not meet the requirements, the voltage or current intensity can be increased appropriately. The frequency and duty cycle of the pulse current can also be changed according to the characteristics of the product liquid to obtain the best separation effect. In addition, the residence time of the product liquid in the separation zone can also be adjusted by controlling the flow rate to obtain the required separation effect. Attached Figure Description

[0047] To better illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments are briefly introduced below. Obviously, they are merely embodiments of the present invention and not limitations thereof.

[0048] Appendix Figure 1 A schematic diagram illustrating the "neck-out" phenomenon present in existing technologies;

[0049] Appendix Figure 2 This is a schematic diagram of the overall composition of an embodiment of the present invention;

[0050] Appendix Figure 3 For the appendix Figure 2 The cross-sectional view along the middle II direction shows the internal structure of the upstream auxiliary support area;

[0051] Appendix Figure 4 For the appendix Figure 2 The cross-sectional view along the II-II direction shows the internal structure of the main separation zone;

[0052] Appendix Figure 5 The increased pressure P in the main separation zone due to electromagnetic force m and the electromagnetic force P in the auxiliary support area x The distribution pattern along the channel height, i.e., the Z-direction;

[0053] Appendix Figure 6 A schematic diagram showing the shape of the electrode plate in the upstream auxiliary support area and the flow channel height H;

[0054] Appendix Figure 1 To be continued Figure 6 The serial numbers and symbols in the text:

[0055] 1. Downstream auxiliary winding, 2. Inlet flange, 3. Power supply, 4. Flow channel, 5. Superconducting magnet housing, 6. Upstream auxiliary winding, 61. Upper half of saddle-shaped superconducting coil, 62. Lower half of saddle-shaped superconducting coil, 7. Upstream auxiliary electrode plate, 8. Main winding, 9. Main electrode plate, 10. Outlet flange. Detailed Implementation

[0056] The present invention will now be described in detail with reference to the accompanying drawings of the embodiments. The described embodiments are only some embodiments of the present invention, and not all embodiments.

[0057] Example 1:

[0058] As attached Figure 2 As shown, a pipeline-type oil-water superconducting electromagnetic separation device includes a main separation zone and auxiliary support zones on its upstream and downstream sides, which together form a self-balancing electromagnetic system.

[0059] For ease of description, the direction of fluid flow or flow channel 4 is defined here as the X direction from left to right, the width direction or front-to-back direction of the rectangular flow channel 4 is defined as the Y direction, and the vertical direction is defined as the Z direction. According to this convention, the magnetic field direction in the main separation zone is along the X direction, while the magnetic field direction in the auxiliary support zone is along the Z direction. Since the electrode plates are arranged on both sides of the flow channel 4, the direction of the current is along the Y direction.

[0060] According to the law of electromagnetic interaction, in the main separation region, since the magnetic field is along the X direction and the current is along the Y direction, the electromagnetic force must be along the Z direction.

[0061] To fully utilize the effect of gravity, the direction of the electromagnetic force is generally set to be consistent with the direction of gravity. Thus, under the combined action of electromagnetic force and gravity, during the oil-water separation process, water sinks while oil rises, ultimately forming a stratified flow with a clear oil-water interface.

[0062] At the same time, once the fluid in the main separation zone is subjected to an electromagnetic force in the same direction as gravity, this part of the fluid will immediately become heavier, and thus its internal pressure will rise sharply.

[0063] Similar to gravity, this electromagnetic force is also a volume force, which can be calculated according to the law of electromagnetic interaction.

[0064] To calculate this additional pressure value, the concept of additional electromagnetic acceleration am is introduced, which is defined as:

[0065]

[0066] In the formula a m The physical meaning of represents the electromagnetic force exerted on a unit mass of water, which is completely similar to the physical meaning of gravitational acceleration; B is the magnetic induction intensity T; σ is the current density A / m2; ρw is the density of water kg / m3.

[0067] Obviously, the distribution of the new pressure also conforms to the distribution law of fluid static pressure in the gravitational field, that is, along the height direction of the flow channel 4, that is, the Z direction, the lower the pressure, the higher the pressure, as shown in equation (3).

[0068] P m =ρ w ×a m ×z (3)

[0069] In the formula, P m The new pressure P caused by electromagnetic force at a certain point in the main separation zone a z is the vertical distance from this point to the top of flow channel 4.

[0070] Under high water content conditions, due to the constraint of the wall, the electromagnetic oil-water separation process in the horizontal flow channel 4 is mainly manifested macroscopically as the water remaining still and the oil droplets floating. Since the water becomes heavier due to the electromagnetic force, the buoyancy of the oil droplets also increases.

[0071] B o = (1+F m )ρ w ×g×w (4)

[0072] Based on the balance between buoyancy, oil droplet resistance, and gravity, the formula for calculating the oil droplet migration velocity Vo can be further derived:

[0073]

[0074] In the formula, B o F represents the buoyant force acting on a single oil droplet, where g is the acceleration due to gravity; m For the additional electromagnetic acceleration a m The ratio of the oil droplet volume to the gravitational acceleration g; w is the volume of the oil droplet; d is the diameter of the oil droplet; ρ o Let μ be the density of the oil. w This is the dynamic viscosity of water.

[0075] Equation (5) is derived by considering electromagnetic forces based on the Stokes formula.

[0076] 1+F in equations (4) and (5) m It has a clear physical meaning; it indicates that the effect of electromagnetic interaction is equivalent to making water heavier by 1+F. m The oil content increased by a factor of two, but the oil content remained unchanged.

[0077] For product liquids with very similar oil and water densities, such as ρ w =990, ρ o =980, even if F m With a value of only 0.5, the density difference between oil and water is amplified by 50.5 times, which means that the separation effect is improved by 50.5 times compared to the original gravity settling rate; and when F m When the value is 1, this multiple reaches 100.

[0078] Therefore, electromagnetic oil-water separation has a significant advantage for product liquids with similar oil and water densities.

[0079] Based on equation (5), the minimum flow channel length L required for the main separation zone can be further determined:

[0080]

[0081] In the formula, H is the height of flow channel 4, and V x The average flow rate of the product liquid within channel 4.

[0082] Although reducing V x This approach helps reduce the length of the main separation zone and lower investment costs. However, when determining Vx, the stability of oil-water separation should be considered first. It's crucial to ensure that the oil and water phases maintain a stratified flow state after separation, with a clear interface between the two phases. For typical product liquids, V... x It should not exceed 0.15 m / s.

[0083] According to fluid mechanics principles, the increased pressure due to electromagnetic force will inevitably propagate along the X direction (horizontal or left-right) to the upstream and downstream sides of the main separation zone. It will also propagate simultaneously along the Y and Z directions. When the pressure propagates along the Y and Z directions, it will be automatically balanced by the constraints of the flow channel walls. Therefore, the function of the auxiliary support zones on the upstream and downstream sides is to generate an equivalent electromagnetic force to balance the increased pressure from the main separation zone, thus preventing a "necking" phenomenon.

[0084] Specifically, the upstream auxiliary support zone should generate an electromagnetic force in the same direction as the flow, while the downstream auxiliary support zone should generate an electromagnetic force in the opposite direction to the flow.

[0085] According to the principle of electromagnetic action, the magnetic field of the upstream and downstream auxiliary support areas of this invention is along the Z direction or the vertical direction, and the current direction is the Y direction. Therefore, the direction of the electromagnetic force must be along the X direction. Thus, by matching the directions of the magnetic field and the current, electromagnetic forces that are opposite to the pressure transmitted from the main separation area can be generated on both the upstream and downstream sides.

[0086] Furthermore, it can be seen from equation (3) that the additional pressure P m The distribution along the height of channel 4 is linear, not uniform; therefore, in order to accurately match P... m The electromagnetic force P per unit area generated by the auxiliary support areas on both the upstream and downstream sides is in equilibrium. x It must also fully conform to equation (3).

[0087] For ease of application, the magnetic induction intensity and current density of the auxiliary support region can be taken to be the same as those of the main separation region. Therefore, the additional electromagnetic acceleration a in the auxiliary support region is... x Additional electromagnetic acceleration a in the main separation zone m They are equal, only a x Along the X direction, and a m The direction is vertically downwards.

[0088] The formula for calculating Px is completely similar to that in formula (3), as shown in formula (7).

[0089] P x =ρ w ×a x ×Lz (7)

[0090] In the formula, P x Pa is the electromagnetic force per unit area; a x The electromagnetic acceleration of the accessory in the X direction is numerically related to a. m Equal; L z The depth of the auxiliary electromagnetic force field on the horizontal section at a distance z from the top of the flow channel within the auxiliary support area, i.e., the X direction, is also the length X direction of the secondary electrode plate at that location. Comparing with equation (3), it can be seen that L z This equals Z. Therefore, the shape of the secondary electrode plate is an isosceles right triangle, see Appendix. Figure 6 .

[0091] Electromagnetic oil-water separation requires a certain amount of electrical energy. The total power consumption includes the power consumption of the superconducting magnet and the DC power consumption applied to the fluid through the electrode plates. The former mainly maintains the low-temperature superconducting environment, while the superconducting coil itself consumes almost no energy. Cooling power consumption is typically higher during startup, but becomes very low once normal operation begins. The DC power consumption is directly related to the conductivity of the product liquid; as conductivity increases, the power consumption decreases proportionally while maintaining the same separation effect.

[0092] When DC power supply 3 is selected in constant voltage (constant voltage) operation mode, its current density σ is calculated according to the following formula:

[0093]

[0094] In the formula, κ is the conductivity of the product liquid, U is the pulse voltage, and D is the distance between the plates.

[0095] When DC power supply 3 is selected in constant current (constant current) operation mode, the voltage is calculated according to the following formula:

[0096]

[0097] In the formula, I is the pulse current intensity, and E a This represents the effective electrode plate area.

[0098] DC power consumption can be calculated using the following formula:

[0099] P=I×U×δ (10)

[0100] In the formula, δ is the duty cycle.

[0101] The magnetic induction intensity B has a direct impact on the oil-water separation effect and energy consumption. For product liquids with relatively low conductivity, a higher B should be selected as much as possible to reduce DC power consumption. For example, when the conductivity is below 2S / m, B should be above 10T, while when the conductivity is above 3S / m, B of 7 to 10T is feasible in terms of technology and economy.

[0102] Example 2:

[0103] A pipeline-type oil-water superconducting electromagnetic separator includes a flow channel 4, with a superconducting magnet shell 5 fitted outside the flow channel 4. The flow channel 4 is arranged horizontally along the X direction and is connected to the product liquid pipeline through an inlet flange 2, while at the downstream end it is connected to the downstream system through an outlet flange 10.

[0104] As attached Figure 3-4 As shown, in order to obtain a uniform electric field and electromagnetic force, the flow channel 4 adopts a rectangular flow section, and the electrode plates of the main separation zone and the upstream and downstream auxiliary support zones are arranged on two sides of the inner wall of the flow channel 4.

[0105] The electrode plate includes a main electrode plate 9 and an auxiliary electrode plate, wherein the auxiliary electrode plate includes an upstream auxiliary electrode plate 7 and a downstream auxiliary electrode plate.

[0106] From upstream to downstream, the flow channel 4 passes sequentially through the upstream auxiliary support area, the upstream auxiliary winding 6, the main winding 8, and the downstream auxiliary winding 1. The upstream auxiliary winding 6, the main winding 8, and the downstream auxiliary winding 1 are located outside the superconducting magnet housing 5.

[0107] As attached Figure 3 As shown, the upstream auxiliary support area includes a power supply 3, an upstream auxiliary electrode plate 7, and an upstream auxiliary winding 6. The upstream auxiliary winding 6 includes an upper half 61 of a saddle-shaped superconducting coil and a lower half 62 of a saddle-shaped superconducting coil.

[0108] The upstream auxiliary electrode plate 7 includes at least one pair of positive and negative electrode plates, which are respectively installed on two sides of the flow channel 4 and connected to the positive and negative terminals of the power supply 3 via wires. The shape of the upstream auxiliary electrode plate 7 is shown in the attached figure. Figure 6 As shown, it is an isosceles right triangle with its hypotenuse facing the entrance.

[0109] The magnetic induction intensity B of the upper half 61 and the lower half 62 of the saddle-shaped superconducting coil is numerically consistent with that of the main separation region and is directed vertically upward. The electromagnetic force generated points towards the main separation region. The distribution of the electromagnetic force Px per unit area along the height is as shown in the formula or appendix. Figure 5 As shown.

[0110] As attached Figure 4As shown, the main separation zone includes a power supply 3, a main electrode plate 9, and a superconducting solenoid winding. The main electrode plate 9 includes at least one pair of positive and negative plates, respectively mounted on two sides of the flow channel 4, and connected to the positive and negative terminals of the power supply 3 via wires. The power supply 3 is a pulsed DC power supply 3, whose frequency, voltage (or current), and duty cycle can be adjusted as needed. According to the law of electromagnetic action, the electromagnetic force generated in the main separation zone is vertically downward, and the newly added pressure P... m The distribution of the height of the flow channel 4 along the Z direction is as shown in equation or Figure 5 As shown.

[0111] The structure of the downstream auxiliary support area is exactly the same as that of the upstream area. It is also composed of power supply 3, downstream auxiliary winding 1 and downstream auxiliary electrode plate. The downstream auxiliary electrode plate and the upstream auxiliary electrode plate 7 are symmetrical about the center of the main separation area, and the hypotenuse faces the outlet. However, the positive and negative poles of the downstream auxiliary electrode plate are exactly opposite to those of the upstream area. Therefore, the direction of the current and the direction of the electromagnetic force are exactly opposite to those of the upstream area, but the direction of the electromagnetic field in the horizontal direction points to the main separation area.

[0112] Example 3:

[0113] A method for implementing a pipeline-type oil-water superconducting electromagnetic separation device:

[0114] Start the superconducting magnet system to generate a stable, ultra-strong magnetic field in the main separation region and the upstream and downstream auxiliary support regions, and then turn on the power supply 3.

[0115] When the product fluid enters the upstream auxiliary support zone, it is subjected to an electromagnetic force pointing towards the main separation zone to balance the increased pressure in the main separation zone caused by the electromagnetic force. Simultaneously, under the influence of this electromagnetic force, the fluid pressure increases. Upon entering the main separation zone, it is subjected to a downward electromagnetic force and gravity, resulting in oil-water separation. The oil floats at the top of flow channel 4, while the water accumulates at the bottom, maintaining a clear interface and forming a stable stratified flow. When flowing through the downstream auxiliary support zone, it is subjected to an electromagnetic force in the opposite direction of flow to balance the increased pressure in the main separation zone pointing towards the outlet caused by the electromagnetic force. Simultaneously, under the influence of this electromagnetic force, the fluid pressure gradually returns to the normal pressure within flow channel 4 before flowing out of the separation system.

[0116] The output voltage or current of power supply 3 can be adjusted according to the separation effect. When the separation effect exceeds expectations, the voltage or current can be appropriately reduced to reduce power consumption, or the flow rate can be increased to make full use of the separation capacity. Otherwise, the adjustment can be made in the opposite direction.

[0117] In addition, the pulse frequency and duty cycle of power supply 3 can be adjusted at any time according to the characteristics of the liquid produced, so as to achieve the optimal frequency and duty cycle of the liquid produced.

[0118] In this embodiment, the conductivity of the produced liquid is 3 S / m, and the magnetic induction intensity B is selected as 7 T.

[0119] Other parameters determined according to formula (10) are shown in the table below:

[0120] Example Separation Device Basic Parameter Table

[0121]

[0122]

[0123] The above description is only one specific embodiment of the present invention. Any person skilled in the art can conceive of other variations and substitutions within the scope of the ideas disclosed in the present invention, but all such variations and substitutions should be covered within the protection scope of the present invention.

Claims

1. A pipeline-type oil-water superconducting electromagnetic separator, comprising a horizontally arranged flow channel, wherein an electromagnetic separation zone composed of windings and electrodes is provided on the flow channel, characterized in that, The electromagnetic separation zone is divided into an upstream auxiliary support zone, a main separation zone, and a downstream auxiliary support zone from upstream to downstream. The main separation zone consists of a main winding disposed outside the flow channel and a main electrode plate disposed inside the flow channel. The upstream auxiliary support zone and the downstream auxiliary support zone consist of an auxiliary winding disposed outside the flow channel and an auxiliary electrode plate disposed inside the flow channel. The auxiliary winding includes an upstream auxiliary winding and a downstream auxiliary winding, and the auxiliary electrode plate includes an upstream auxiliary electrode plate and a downstream auxiliary electrode plate. The electromagnetic force generated by the auxiliary winding and auxiliary electrode plate is directed towards the main separation region.

2. The pipeline-type oil-water superconducting electromagnetic separation device according to claim 1, characterized in that, The main winding includes a superconducting solenoid winding, which is coaxial with the flow channel.

3. The pipeline-type oil-water superconducting electromagnetic separation device according to claim 2, characterized in that, The main electrode plate includes at least one pair of main positive and negative electrode plates, which are respectively placed on both sides of the flow channel.

4. The pipeline-type oil-water superconducting electromagnetic separation device according to claim 3, characterized in that, The auxiliary winding includes an upper superconducting coil and a lower superconducting coil. Both the upper and lower superconducting coils are saddle-shaped superconducting coils, and they are arranged symmetrically with the horizontal plane of the flow channel center as the center.

5. A pipeline-type oil-water superconducting electromagnetic separation device according to claim 4, characterized in that, The auxiliary electrode plate includes at least one pair of auxiliary positive and negative electrode plates.

6. The pipeline-type oil-water superconducting electromagnetic separation device according to claim 5, characterized in that, The auxiliary electrode plate is an isosceles right triangle, wherein the hypotenuse of the upstream auxiliary electrode plate faces the flow channel inlet, and the hypotenuse of the downstream auxiliary electrode plate faces the flow channel outlet.

7. A pipeline-type oil-water superconducting electromagnetic separation device according to any one of claims 1-6, characterized in that, It also includes a power supply, which is an adjustable DC power supply with an output current of DC pulses. The frequency, duty cycle, voltage or current of the pulses are continuously adjustable. The power supply is electrically connected to the main electrode plate and the auxiliary electrode plate.

8. The method for implementing a pipeline-type oil-water superconducting electromagnetic separation device according to claim 7, characterized in that, This includes calculating the minimum length L of the flow channel, using the following formula: In the formula: H is the channel height, Vx is the average axial velocity, and Vo is the upward migration velocity of the oil droplet.

9. The method for implementing a pipeline-type oil-water superconducting electromagnetic separation device according to claim 8, characterized in that, The upward migration velocity Vo of the oil droplet is calculated by the following formula: In the formula: g is the acceleration due to gravity, d is the diameter of the oil droplet; ρ o Let μ be the density of the oil. w F is the dynamic viscosity of water. m For the additional electromagnetic acceleration a m The ratio to the gravitational acceleration g; The additional electromagnetic acceleration a m Calculate using the following formula: In the formula: B is the magnetic flux density, and σ is the current density.

10. A method for implementing a pipeline-type oil-water superconducting electromagnetic separation device according to claim 9, characterized in that, When the power supply is selected to operate in constant voltage mode, its current density σ is calculated using the following formula: In the formula: κ is the conductivity of the product liquid, U is the pulse voltage, and D is the distance between the plates; When the power supply is selected to operate in constant current mode, its voltage U is calculated using the following formula. In the formula: I is the pulse current intensity, E a The effective electrode plate area; DC power consumption is calculated using the following formula: In the formula: δ is the duty cycle.

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