A multiphase flow optimization device for abandoned mine water geothermal extraction

Abstract

The application discloses a kind of waste mine water geothermal extraction multiphase flow optimization device, it is related to geothermal resource processing technical field, including separation cavity subassembly and respectively being arranged in the first rotary joint and the second rotary joint of separation cavity subassembly left and right ends, first rotary joint and second rotary joint are used to realize the rotatable connection of separation cavity subassembly and fluid seal transmission, by in the cooperation of separation cavity subassembly, utilize main separation cavity broken cluster and vice separation cavity four-stage fractals guide combination, realize gas-liquid-solid " preliminary separation, fine separation, accurate separation, fine particle control " whole-process processing, so that separation efficiency is improved compared with traditional cyclone, and improve solid particle retention rate, and utilize main separation cavity rotation and wing type convex rib array cooperation, so that gas-liquid separation efficiency is greatly improved, so that overall heat exchanger fouling rate and gas blockage are greatly reduced, and heat transfer coefficient is improved, so that the service life of overall equipment is long.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geothermal resource processing, in particular to a multiphase flow optimization device for abandoned mine water geothermal extraction. BACKGROUND

[0002] With the depletion of mineral resources, the number of abandoned mines has increased rapidly worldwide. Mine water, as a byproduct of mine exploitation, the core process of abandoned mine water geothermal extraction currently includes: multiphase flow separation → heat exchange → water purification. Among them, multiphase flow separation is the key link restricting the efficiency of geothermal extraction, and the existing technology mainly adopts the following schemes:

[0003] Traditional centrifugal separation: preliminary separation of gas-liquid-solid is realized through a cyclone device, but the separation effect of fine particles and micro-bubbles is poor, which easily causes the subsequent heat exchanger to be blocked;

[0004] Gravity sedimentation and filtration: relying on standing sedimentation or medium filtration, the processing efficiency is low, and it is difficult to adapt to the characteristics of large fluctuation of mine water quality;

[0005] Single physical or chemical separation: such as using a filter screen to intercept solid particles, or using a gas floatation method to separate gas bubbles, but it lacks a grading treatment mechanism for multiphase flow, and cannot simultaneously solve the problems of gas-liquid separation, solid-liquid separation, and particle grading.

[0006] At present, in the operation process of abandoned mine water geothermal extraction, due to the complex interaction of gas-liquid-solid three phases in mine water, traditional separation devices (such as cyclone separators and sedimentation tanks) are difficult to realize efficient grading separation of “gas-liquid-solid”, which leads to the formation of “gas resistance” in the heat exchanger when the gas is not completely separated, reduces the heat exchange coefficient, and reduces the heat exchange efficiency. Solid particles remaining are easy to wear the heat exchanger pipeline, or form a thermal resistance layer, so it cannot meet the requirements of geothermal extraction on fluid purity, and the traditional device adopts single-chamber separation, which does not form a “grading separation” logic, and needs to be processed multiple times to achieve the target, which is high in energy consumption. In addition, the turbulent intensity in the separation chamber is insufficient or unevenly distributed, which easily leads to the difficulty of breaking up of gas-liquid clusters and low solid particle sedimentation efficiency, so it is necessary to propose a multiphase flow optimization device for abandoned mine water geothermal extraction. SUMMARY

[0007] The purpose of the present invention is to provide a multiphase flow optimization device for geothermal extraction of abandoned mine water to solve the problem proposed in the above-mentioned background technology that during the operation of geothermal extraction of abandoned mine water, due to the complex interaction between the gas, liquid and solid phases in the mine water, traditional separation devices (such as cyclone separators and sedimentation tanks) are difficult to achieve efficient graded separation of "gas-liquid-solid". As a result, when the gas is not completely separated, "gas resistance" will be formed in the heat exchanger, which will reduce the heat transfer coefficient and the heat transfer efficiency. In addition, the residual solid particles are easy to wear the heat exchanger pipes or deposit to form a thermal resistance layer, so it is impossible to meet the fluid purity requirements of geothermal extraction. At the same time, traditional devices mostly use single-chamber separation, and do not form a "graded separation" logic. Multiple cycles of processing are required to achieve the target, with high energy consumption. In addition, the turbulence intensity in the separation chamber is insufficient or unevenly distributed, which easily leads to gas-liquid agglomerates that are difficult to break and the solid particle sedimentation efficiency is low.

[0008] To achieve the above objectives, the present invention provides the following technical solutions: a multiphase flow optimization device for geothermal extraction of abandoned mine water, comprising a separation chamber assembly and a first rotary joint and a second rotary joint respectively disposed at the left and right ends of the separation chamber assembly, wherein the first rotary joint and the second rotary joint are used to achieve rotatable connection of the separation chamber assembly and fluid-sealed transmission;

[0009] The separation chamber assembly includes a main separation chamber, a secondary separation chamber and a magnetic field control electromagnetic coil. The main separation chamber is arranged in a honeycomb-like hexagonal cavity, and an inner wall thereof is evenly distributed with an array of wing-shaped ridges. The wing-shaped ridge array extends along the direction of fluid flow and is integrally formed with the inner wall of the main separation chamber to induce micro-vortices to break up gas-liquid agglomerates. The secondary separation chambers are respectively arranged as a first separation chamber, a second separation chamber, a third separation chamber and a fourth separation chamber. The secondary separation chambers are connected to the outside of the main separation chamber, and are respectively integrated with coral fractal branch guides. The coral fractal branch guides are distributed in a tree shape. The coral fractal branch guides are composed of a main branch, a branch and a secondary branch. The inner diameter decreases and the fractal level increases from the main branch to the secondary branch. The inner wall surfaces of the main branch, the branch and the secondary branch are all provided with diversion grooves to achieve four-level graded separation of gas, liquid and solid through fractal diversion. The magnetic field control electromagnetic coils are equally arranged around the outer wall of the main separation chamber to generate a pulsed electromagnetic field to achieve dielectrophoresis separation of charged particles.

[0010] Preferably, a rounded transition structure is provided at each inner corner of the hexagonal cavity of the main separation chamber, and the rounded corner radius is used to reduce the turbulent loss of the fluid at the corner. The airfoil cross-section of the airfoil ridge array is an asymmetric structure, and its leading edge curvature radius is greater than the trailing edge curvature radius, and the chord length direction of the airfoil is at an angle of attack of 10° to the fluid flow direction, which is used to optimize the vortex shedding frequency and enhance the phase mass transfer. The leading edge surface of the airfoil ridge array is provided with multiple groups of guide holes, and the multiple groups of guide holes change in sequence from small to large.

[0011] Preferably, the first separation chamber, the second separation chamber, the third separation chamber and the fourth separation chamber are arranged in a stepped manner along the direction of fluid flow, and the connection angles of the main branch road and the branch road and the connection angles of the branch road and the secondary branch decrease successively. The side end of the secondary branch is connected with a guide path, and the side end of the second rotary joint is connected with a high-pressure liquid inlet end. The interior of the main separation chamber is respectively formed with a high diversion area and a high-pressure flow area, and the side end of the high-pressure liquid inlet end is a high-pressure output end.

[0012] Preferably, the outlet of the main separation chamber and the inlet of the secondary separation chamber are connected by an annular flow equalizing plate, and the annular flow equalizing plate is evenly distributed with guide groove branches with gradually changing diameters, which are used to convert the vortex in the main separation chamber into uniform laminar flow entering the secondary separation chamber.

[0013] Preferably, the bottoms of the first separation chamber, the second separation chamber, the third separation chamber and the fourth separation chamber are all provided with slag discharge ports, which are connected to an external slag collecting tank through an electromagnetic valve for regularly discharging the separated solid particles.

[0014] Preferably, the magnetic field control electromagnetic coil adopts a segmented winding structure, which is divided into several independently controlled coil units along the circumference of the outer wall of the main separation chamber. Each coil unit can independently adjust the current intensity and frequency. The inner wall of the main separation chamber is embedded with an electrode array. The magnetic field control electromagnetic coil cooperates with the electrode array, and the electrode array is a mesh structure, which is used to form a non-uniform electric field inside the main separation chamber to achieve directional migration of charged particles.

[0015] Preferably, friction swivels are installed at both left and right ends of the main separation chamber, the outside of the friction swivel is slidably connected to a mounting seat, the inside of the mounting seat is provided with a friction member, and the side end of the friction member is provided with a servo drive member.

[0016] Preferably, three groups of stator and rotor structures are arranged around the outer wall surface of the friction rotating ring, and connecting frames are installed on the side ends of the three groups of stator and rotor structures.

[0017] Preferably, a laser Doppler velocimeter and a capacitance tomography sensor are installed at the entrance of the main separation chamber, which are used to detect the fluid velocity distribution and the gas-liquid-solid three-phase distribution respectively. The capacitance tomography sensor signal is connected to the prediction controller, which predicts the flow pattern changes and dynamically adjusts the flow rate at the entrance of the separation chamber to achieve adaptive separation of multiphase flow.

[0018] Preferably, the side end of the first rotary joint is communicated with a metal bellows, the side end of the metal bellows is communicated with a flow regulating valve, the side end of the flow regulating valve is communicated with a flow divider, the side end of the flow divider is communicated with a leaf vein micro-channel heat exchange pipe, the flow divider is used for uniformly delivering the adjusted fluid to the leaf vein micro-channel heat exchange pipe, and the side end of the leaf vein micro-channel heat exchange pipe is communicated with a water outlet pipe for collecting the treated fluid.

[0019] Compared with the prior art, the beneficial effects of the present application are:

[0020] 1、In the present application, under the cooperation of the separation cavity assembly, the residue discharge port at the bottom of each stage of the auxiliary separation cavity is controlled by the electromagnetic valve, and is opened in time according to the sensor data, so that the trapped silt and particles are discharged into the external residue collecting tank, avoiding frequent manual maintenance and reducing the risk of pipeline blockage. In addition, the combination of the crushing and grouping of the main separation cavity and the four-stage fractal flow guide of the auxiliary separation cavity realizes the whole process treatment of “preliminary separation, fine separation, accurate separation and fine particle control”, improves the separation efficiency compared with the traditional cyclone, increases the solid particle retention rate, uses the pulsed electromagnetic field to treat the charged particles, solves the problem of low efficiency of fine particles in traditional mechanical separation, avoids the problems of excessive separation or insufficient separation, reduces fluid impact and turbulent loss under the action of the round corner transition and the gradually changing flow guide hole, reduces energy consumption, significantly reduces the solid content and gas content of the separated fluid, greatly reduces the scaling rate of the heat exchanger and gas blockage, and improves the heat transfer coefficient, thereby prolonging the service life of the overall equipment.

[0021] 2、In the present application, under the cooperation of the separation cavity assembly, the gas-liquid separation efficiency is greatly improved by the cooperation of the rotation of the main separation cavity and the wing-shaped rib array, the solid particle retention rate is improved, especially the separation effect of fine particles is significantly improved, and the adaptability is improved compared with the traditional fixed-speed separation device, the amount of scaling of the heat exchange pipe is reduced, and the annual geothermal extraction amount of a single well is increased. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a main view structural schematic diagram of a waste mine water geothermal extraction multi-phase flow optimization device of the present application;

[0023] Figure 2 It is a separation structure schematic diagram of a main body of a waste mine water geothermal extraction multi-phase flow optimization device of the present application;

[0024] Figure 3 It is a separation structure schematic diagram of a separation cavity assembly in a waste mine water geothermal extraction multi-phase flow optimization device of the present application;

[0025] Figure 4 It is an installation position structure schematic diagram of a wing-shaped rib array in a waste mine water geothermal extraction multi-phase flow optimization device of the present application;

[0026] Figure 5 The present invention is a multiphase flow optimization device for geothermal extraction of abandoned mine water Figure 1 A schematic diagram of the enlarged structure at point A;

[0027] Figure 6 The present invention is a multiphase flow optimization device for geothermal extraction of abandoned mine water Figure 4 A schematic diagram of the enlarged structure at point B;

[0028] Figure 7 This is a schematic cross-sectional structural diagram of the main separation chamber and the auxiliary separation chamber in a multiphase flow optimization device for geothermal extraction of abandoned mine water according to the present invention.

[0029] Figure: 100, high-pressure liquid inlet; 200, separation chamber assembly; 201, main separation chamber; 202, annular flow plate; 203, flow guide channel; 204, magnetic field control electromagnetic coil; 205, first separation chamber; 206, second separation chamber; 207, third separation chamber; 208, fourth separation chamber; 209, airfoil ridge array; 210, flow guide hole; 211, high diversion area; 212, high-pressure flow area; 213, high-pressure output End; 214, main branch; 215, branch; 216, secondary branch; 217, guide path; 300, first rotary joint; 400, metal bellows; 500, connecting frame; 600, flow regulating valve; 700, diverter; 800, imitation leaf vein microchannel heat exchange tube; 900, water outlet pipe; 110, second rotary joint; 120, friction swivel; 130, mounting seat; 140, friction part; 150, stator and rotor structure. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] Reference Figures 1-7 As shown: A multiphase flow optimization device for geothermal extraction of abandoned mine water includes a separation chamber assembly 200 and a first rotary joint 300 and a second rotary joint 110 respectively installed at the left and right ends of the separation chamber assembly 200. The first rotary joint 300 and the second rotary joint 110 are used to realize the rotatable connection and fluid sealing transmission of the separation chamber assembly 200.

[0032] The whole system is used for efficient gas-liquid-solid three-phase separation of abandoned mine water, providing clean fluid for subsequent geothermal exchange.

[0033] The separation chamber assembly 200 includes a main separation chamber 201, a secondary separation chamber and a magnetic field control electromagnetic coil 204. The main separation chamber 201 is a hexagonal cavity imitating a honeycomb, which simulates the mechanical stability of the honeycomb and reduces the impact wear of the fluid on the cavity wall. An array of wing-shaped ridges 209 is evenly distributed on the inner wall thereof. The wing-shaped ridge array 209 extends along the direction of fluid flow and is integrally formed with the inner wall of the main separation chamber 201 to induce micro-vortices to break up gas-liquid agglomerates. The secondary separation chambers are respectively set as the first separation chamber 205, the second separation chamber 206, the third separation chamber 207 and the fourth separation chamber 208. The secondary separation chambers are connected to the outside of the main separation chamber 201, wherein the secondary separation chambers are connected to the outlet of the main separation chamber 201 through a flange. The first separation chamber 205 uses inertia force to initially separate the gas and liquid. The gas overflows from the top of the branch, and the liquid carries particles. The particles enter the secondary branch 216, and the auxiliary separation chamber is respectively integrated with coral fractal branch guides, which are distributed in a tree shape. The coral fractal branch guides are composed of a main branch 214, a branch 215 and a secondary branch 216. The inner diameter is reduced and the fractal level is increased from the main branch 214 to the secondary branch 216. The inner wall surfaces of the main branch 214, the branch 215 and the secondary branch 216 are all provided with guide grooves for realizing four-level graded separation of gas, liquid and solid through fractal guidance. The primary separation of gas and liquid, fine separation of solid and liquid, precise separation of gas and liquid and graded separation of fine particles are completed in turn through the main branch 214, the branch 215 and the secondary branch 216. The magnetic field control electromagnetic coil 204 is equally divided and arranged around the outer wall of the main separation chamber 201, for generating a pulsed electromagnetic field to realize the dielectrophoresis separation of charged particles.

[0034] A rounded transition structure is provided at each inner corner of the hexagonal cavity of the main separation chamber 201. The rounded corner radius is used to reduce the turbulent loss of the fluid at the corner. The airfoil cross-section of the airfoil ridge array 209 is an asymmetric structure. The leading edge curvature radius is greater than the trailing edge curvature radius, and the chord length direction of the airfoil is at an angle of attack of 10° to the fluid flow direction, which is used to optimize the vortex shedding frequency and enhance the phase mass transfer. The leading edge surface of the airfoil ridge array 209 is provided with multiple groups of guide holes 210, and the multiple groups of guide holes 210 change in sequence from small to large. The fluid micro-jets are guided by the gradual change of the aperture to further cut the particle agglomerates and avoid the flow dead zone on the leeward side of the ridges in the airfoil ridge array 209.

[0035] The first separation chamber 205, the second separation chamber 206, the third separation chamber 207 and the fourth separation chamber 208 are arranged in a stepped manner along the direction of fluid flow. The connection angles of the main branch 214 and the branch 215 and the connection angles of the branch 215 and the secondary branch 216 decrease in sequence. The side end of the secondary branch 216 is connected to the guide path 217, and the side end of the second rotary joint 110 is connected to the high-pressure liquid inlet end 100. A high diversion area 211 and a high-pressure flow area 212 are formed inside the main separation chamber 201 respectively. The side end of the high-pressure liquid inlet end 100 is the high-pressure output end 213, wherein the high diversion area 211 is located at the front end of the airfoil ridge array 209, and the inlet fluid is evenly divided into 6 branches through the hexagonal top corner guide structure to ensure that the load of each ridge unit is balanced, and the high-pressure flow area 212 increases the fluid velocity through the contraction bottom flow channel, and cooperates with the vortex induced by the ridge to form a composite effect of turbulent fragmentation and high-speed dispersion.

[0036] The outlet of the main separation chamber 201 and the inlet of the secondary separation chamber are connected by an annular flow balancing plate 202, and the annular flow balancing plate 202 is evenly distributed with guide groove branches 203 with gradually changing diameters, which are used to convert the vortex in the main separation chamber 201 into a uniform laminar flow entering the secondary separation chamber, wherein the annular flow balancing plate 202 is located between the outlet of the main separation chamber 201 and the inlet of the secondary separation chamber, and a number of guide groove branches 203 are evenly distributed on the surface, and the grooves are distributed in the form of Archimedean spirals, so that when the vortex discharged from the main separation chamber 201 flows through, the spiral guide grooves force the fluid to move radially, converting the circumferential velocity component into axial velocity, forming a uniform laminar flow entering the secondary separation chamber, and avoiding the interference of high-speed vortex on graded separation.

[0037] The bottoms of the first separation chamber 205 , the second separation chamber 206 , the third separation chamber 207 and the fourth separation chamber 208 are all provided with slag discharge ports, which are connected to an external slag collecting tank through a solenoid valve for regularly discharging the separated solid particles.

[0038] The magnetic field control electromagnetic coil 204 adopts a segmented winding structure and is divided into several independently controlled coil units along the circumference of the outer wall of the main separation chamber 201. Each coil unit can independently adjust the current intensity and frequency. The inner wall of the main separation chamber 201 is embedded with an electrode array. The magnetic field control electromagnetic coil 204 cooperates with the electrode array, and the electrode array is a mesh structure, which is used to form a non-uniform electric field inside the main separation chamber 201 to achieve directional migration of charged particles.

[0039] Specifically: first, a multiphase flow carrying gas (methane), liquid (mine water), and solid (silt, mineral particles) enters from the high-pressure liquid inlet end 100 and is introduced into the main separation chamber 201 through the second rotary joint 110. The hexagonal geometric structure of the main separation chamber 201 provides a stable flow channel, and the rounded transition of the inner corners reduces the turbulent loss of the fluid in the corners, ensuring a uniform flow field.

[0040] Then, when the fluid flows through the airfoil ridge array 209 on the inner wall, the asymmetric airfoil (the leading edge curvature radius is larger than the trailing edge, and the chord length forms an attack angle of 10° with the flow direction) induces regular micro-vortices, which allow these vortices to break up larger gas-liquid clusters (such as millimeter-sized bubbles and particle clusters), making the gas-liquid interface more stable and creating conditions for subsequent graded separation.

[0041] The high diversion area 211 formed inside the main separation chamber 201 evenly distributes the fluid to the gaps between the ridges. The high-pressure flow area 212 increases the kinetic energy of the particles by increasing the flow rate. Combined with the gradually expanding design of the guide hole 210, it further disperses the fluid to avoid local accumulation.

[0042] After the multiphase flow is initially processed by the main separation chamber 201, it reaches the outlet. When it passes through the annular flow equalizing plate 202, the guide channel 203 with a gradually changing diameter converts the high-speed swirl flow into a stable laminar flow, reducing the impact of the fluid impact on the secondary separation chamber and ensuring the stability of subsequent graded separation.

[0043] Then use the four-level coral fractal guide to separate step by step.

[0044] That is, preliminary separation of gas and liquid is formed through the first separation chamber 205 and the main branch 214, that is, laminar flow enters the main branch 214 (with a larger inner diameter), and by utilizing the inertial force and the initial angle of the fractal guide (such as 60°), the gas with lower density floats to the top of the branch, and the liquid carries the particles into the secondary branch 216, thereby achieving preliminary separation of gas and liquid.

[0045] Then, fine solid-liquid separation is achieved through the second separation chamber 206 and the branch path 215. That is, the fluid enters the branch path 215 with a reduced inner diameter, and the increased flow rate generates centrifugal force, causing solid particles to gather toward the tube wall and be intercepted by the inner wall guide grooves. They are regularly discharged through the slag discharge port, allowing clean liquid to enter the next stage.

[0046] Then, precise gas-liquid separation is achieved through the third separation chamber 207 and the secondary branch 216, allowing clean liquid to enter and flow from the further reduced secondary branch 216. The pipe diameter is used to enhance the surface tension, causing microbubbles to coalesce and overflow along the gaps in the guide grooves, and the liquid continues to flow to the next level.

[0047] Then, fine particle graded separation is achieved through the fourth separation chamber 208 and the guide path 217. That is, for charged particles (such as metal oxide colloids), the pulsed electromagnetic field of the electromagnetic coil 204 is controlled by the magnetic field, and the charged particles are migrated to the electrode array through the dielectrophoresis effect, thereby achieving efficient retention of fine particles. Finally, the pure liquid enters the subsequent process. That is, during the above-mentioned operation, the magnetic field on the periphery of the main separation chamber 201 is used to control the electromagnetic coil 204 to cooperate with the mesh electrode array on the inner wall to generate a non-uniform pulsed electromagnetic field, thereby causing the negatively charged clay particles to migrate to the anode plate under the action of the dielectrophoretic force, thereby preventing them from entering the secondary separation chamber and clogging the flow channel, thereby improving the overall separation accuracy.

[0048] In addition, the laser Doppler velocimeter and electrical capacitance tomography sensor at the entrance of the main separation chamber 201 monitor the fluid velocity distribution and the three-phase ratio in real time. After the signal is transmitted to the predictive controller, the opening of the flow control valve 600 is dynamically adjusted to reduce the flow rate when the solid content is low and extend the separation time, while increasing the flow rate when the gas content is high to avoid gas resistance affecting subsequent heat exchange.

[0049] The liquid after the four-stage separation is then discharged through the first rotary joint 300 and evenly distributed to the leaf vein-like microchannel heat exchange tube 800 through the metal bellows 400 and the diverter 700 for geothermal exchange (such as heating heating water or power generation medium).

[0050] During the overall process, the slag discharge ports at the bottom of each level of the secondary separation chamber are controlled by electromagnetic valves, which are opened at regular intervals according to sensor data (e.g., 5 minutes per hour) to discharge the retained mud and particles into an external slag collecting tank, thereby avoiding frequent manual maintenance and reducing the risk of pipeline blockage. The main separation chamber 201 is combined with the four-level fractal flow diversion in the secondary separation chamber to achieve the full process of "initial separation, fine separation, precise separation, and fine particle control" of gas, liquid, and solid, thereby improving the separation efficiency compared to traditional cyclones and increasing the solid particle retention rate. At the same time, a pulsed electromagnetic field is used to specifically treat charged particles, solving the problem of low efficiency of traditional mechanical separation for fine particles and avoiding the problem of over-separation or under-separation. The rounded corner transition and the gradual setting of the guide hole 210 are used to reduce fluid impact and turbulent loss, reduce energy consumption, and significantly reduce the solid content and gas content of the separated fluid, greatly reducing the scaling rate and gas blockage of the heat exchanger, and improving the heat transfer coefficient, thereby extending the service life of the overall equipment.

[0051] according to Figures 1-3 As shown, friction rings 120 are installed at both ends of the main separation chamber 201. The outside of the friction ring 120 is slidably connected to a mounting seat 130. The inside of the mounting seat 130 is installed with a friction member 140. The side end of the friction member 140 is installed with a servo drive member.

[0052] The outer wall surface of the friction rotating ring 120 is provided with three sets of fixed rotor structures 150, and the side ends of the three sets of fixed rotor structures 150 are provided with connecting frames 500.

[0053] A laser Doppler velocimeter and a capacitance tomography sensor are installed at the inlet of the main separation cavity 201, which are respectively used for detecting the fluid velocity distribution and the gas-liquid-solid three-phase distribution, the signal of the capacitance tomography sensor is connected to a predictive controller, the predictive controller predicts the flow pattern change and dynamically adjusts the flow rate at the inlet of the separation cavity, so as to realize adaptive separation of multiphase flow.

[0054] The side end of the first rotary joint 300 is communicated with a metal bellows 400, the side end of the metal bellows 400 is communicated with a flow regulating valve 600, the side end of the flow regulating valve 600 is communicated with a flow divider 700, the side end of the flow divider 700 is communicated with a leaf vein micro-channel heat exchange pipe 800, the flow divider 700 is used for uniformly delivering the adjusted fluid to the leaf vein micro-channel heat exchange pipe 800, and the side end of the leaf vein micro-channel heat exchange pipe 800 is communicated with a water outlet pipe 900 for collecting the processed fluid.

[0055] Further specifically: the servo drive is started, so that the main separation cavity 201 rotates at a low speed, the friction rotating ring 120 and the fixed rotor structure (150) form a stable rotating structure, the mine water carrying gas-liquid-solid three-phase flows from the high-pressure liquid inlet end 100 into the main separation cavity 201 through the second rotary joint 110, in which, the laser Doppler velocimeter monitors the inlet flow rate in real time, and the capacitance tomography sensor detects the initial solid content and gas content.

[0056] When the main separation cavity 201 rotates, the wing-shaped rib array 209 rotates with the cavity wall, the vortex breaking effect is enhanced, the centrifugal force generated by rotation can assist gas-liquid separation, and the moving speed of the gas bubbles to the cavity wall is improved, the rotational jet flow of the flow guide hole 210 further cuts the particle clusters, and the solid particle dispersion degree is improved, the magnetic field control electromagnetic coil 204 also works synchronously, and the dielectrophoresis force is applied to the charged particles (such as clay colloids), and the centrifugal force generated by rotation is used to improve the migration efficiency of the particles to the electrode array.

[0057] Then, under the cooperation of the predictive controller, if the predictive controller detects that the solid content rises (more than 10% of the threshold value) according to the capacitance tomography sensor data, the opening of the flow regulating valve 600 is automatically reduced, the flow rate is increased, and the rotation speed of the main separation cavity 201 is increased to enhance the centrifugal separation effect.

[0058] Then, the adjusted fluid is compensated for thermal expansion through the metal bellows 400, is evenly divided into four paths through the flow divider 700, is introduced into the leaf vein micro-channel heat exchange pipe 800 for geothermal exchange, and the fluid after heat exchange is discharged from the water outlet pipe 900.

[0059] The bottom slag discharge port of the sub-separation chamber is opened according to a preset program (5 minutes per hour), and after the electromagnetic valve is opened, the backflush fluid (clean water from the water outlet pipe 900) flushes the groove to remove the trapped solid particles.

[0060] The whole device is rotated by the main separation chamber 201 and cooperates with the wing-shaped rib array 209, so that the gas-liquid separation efficiency is greatly improved, the solid particle trapping rate is improved, especially the separation effect of fine particles is significantly improved, and the adaptability is improved compared with the conventional fixed speed separation device, the heat exchange pipe fouling amount is reduced, the single well annual geothermal extraction amount is increased.

[0061] The wiring diagram of the magnetic field control electromagnetic coil 204, the flow regulating valve 600 and the flow divider 700 in the application belongs to the common knowledge in the field, and the working principle is a known technology, and the model is selected according to actual use; therefore, the control mode and wiring arrangement of the magnetic field control electromagnetic coil 204, the flow regulating valve 600 and the flow divider 700 are not explained in detail.

[0062] Although the application is described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A multiphase flow optimization device for geothermal extraction of abandoned mine water, characterized by: The invention comprises a separation chamber assembly (200) and a first rotary joint (300) and a second rotary joint (110) respectively arranged at the left and right ends of the separation chamber assembly (200), wherein the first rotary joint (300) and the second rotary joint (110) are used to realize rotatable connection and fluid sealing transmission of the separation chamber assembly (200); The separation chamber assembly (200) includes a main separation chamber (201), an auxiliary separation chamber and a magnetic field control electromagnetic coil (204). The main separation chamber (201) is a honeycomb-like hexagonal cavity, and an inner wall thereof is evenly distributed with an array of wing-shaped ridges (209). The array of wing-shaped ridges (209) extends along the direction of fluid flow and is integrally formed with the inner wall of the main separation chamber (201) to induce micro-vortices to break up gas-liquid clusters. The auxiliary separation chambers are respectively configured as a first separation chamber (205), a second separation chamber (206), a third separation chamber (207) and a fourth separation chamber (208). The auxiliary separation chambers are connected to the outside of the main separation chamber (201), and the inside thereof is respectively The invention is integrated with a coral fractal branch guide, wherein the coral fractal branch guide is distributed in a tree shape, and the coral fractal branch guide consists of a main branch (214), a branch (215) and a secondary branch (216). The inner diameter decreases and the fractal level increases from the main branch (214) to the secondary branch (216). The inner wall surfaces of the main branch (214), the branch (215) and the secondary branch (216) are all provided with a guide groove for realizing four-level separation of gas, liquid and solid through fractal guide. The magnetic field control electromagnetic coil (204) is equally divided and arranged around the outer peripheral wall of the main separation chamber (201), and is used to generate a pulsed electromagnetic field to realize the dielectrophoresis separation of charged particles. Each inner corner of the hexagonal cavity of the main separation cavity (201) is provided with a fillet transition structure, and the fillet radius is used to reduce the turbulent loss of the fluid at the corner. The airfoil cross section of the airfoil ridge array (209) is an asymmetric structure, the leading edge curvature radius is greater than the trailing edge curvature radius, and the airfoil chord length direction and the fluid flow direction form an attack angle of 10°, which is used to optimize the vortex shedding frequency and enhance the phase mass transfer. The leading edge surface of the airfoil ridge array (209) is provided with multiple groups of guide holes (210), and the multiple groups of guide holes (210) are sequentially changed from small to large. The first separation chamber (205), the second separation chamber (206), the third separation chamber (207) and the fourth separation chamber (208) are arranged in a stepped manner along the fluid flow direction; the connection angles of the main branch (214) and the branch (215) and the connection angles of the branch (215) and the secondary branch (216) decrease in sequence; the side end of the secondary branch (216) is connected to a guide path (217); the side end of the second rotary joint (110) is connected to a high-pressure liquid inlet (100); a high-diversion area (211) and a high-pressure flow area (212) are respectively formed inside the main separation chamber (201); and the side end of the high-pressure liquid inlet (100) is a high-pressure output end (213); The bottoms of the first separation chamber (205), the second separation chamber (206), the third separation chamber (207) and the fourth separation chamber (208) are all provided with slag discharge ports, which are connected to an external slag collecting tank via a solenoid valve and are used to discharge the separated solid particles at regular intervals.

2. The multiphase flow optimization device for geothermal extraction of abandoned mine water according to claim 1, characterized in that: The outlet of the main separation chamber (201) and the inlet of the auxiliary separation chamber are connected by an annular flow averaging plate (202), and the annular flow averaging plate (202) is evenly distributed with flow guide groove branches (203) with gradually changing diameters, which are used to convert the swirling flow in the main separation chamber (201) into uniform laminar flow entering the auxiliary separation chamber.

3. The multiphase flow optimization device for geothermal extraction of abandoned mine water according to claim 1, characterized in that: The magnetic field control electromagnetic coil (204) adopts a segmented winding structure and is divided into a plurality of independently controlled coil units along the circumference of the outer wall of the main separation chamber (201). Each coil unit can independently adjust the current intensity and frequency. The inner wall of the main separation chamber (201) is embedded with an electrode array. The magnetic field control electromagnetic coil (204) cooperates with the electrode array, and the electrode array has a mesh structure and is used to form a non-uniform electric field inside the main separation chamber (201) to achieve directional migration of charged particles.

4. The multiphase flow optimization device for geothermal extraction of abandoned mine water according to claim 1, characterized in that: Friction rotating rings (120) are installed at both left and right ends of the main separation chamber (201). The outside of the friction rotating ring (120) is slidably connected to a mounting seat (130). A friction member (140) is installed inside the mounting seat (130). A servo drive member is installed at the side end of the friction member (140).

5. The multiphase flow optimization device for geothermal extraction of abandoned mine water according to claim 4, characterized in that: Three groups of stator and rotor structures (150) are arranged around the outer wall surface of the friction rotating ring (120), and connecting frames (500) are installed at the side ends of the three groups of stator and rotor structures (150).

6. The multiphase flow optimization device for geothermal extraction of abandoned mine water according to claim 1, characterized in that: A laser Doppler velocimeter and a capacitance tomography sensor are installed at the entrance of the main separation chamber (201), which are used to detect the fluid velocity distribution and the gas-liquid-solid three-phase distribution respectively. The capacitance tomography sensor signal is connected to the prediction controller, which predicts the flow pattern change and dynamically adjusts the flow velocity at the entrance of the separation chamber to achieve adaptive separation of multiphase flow.

7. The multiphase flow optimization device for geothermal extraction of abandoned mine water according to claim 1, characterized in that: The side end of the first rotary joint (300) is connected to a metal bellows (400), the side end of the metal bellows (400) is connected to a flow regulating valve (600), the side end of the flow regulating valve (600) is connected to a diverter (700), the side end of the diverter (700) is connected to a leaf vein-simulating microchannel heat exchange tube (800), the diverter (700) is used to uniformly transport the regulated fluid to the leaf vein-simulating microchannel heat exchange tube (800), and the side end of the leaf vein-simulating microchannel heat exchange tube (800) is connected to a water outlet pipe (900) for collecting the treated fluid.

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