Airlift pump system for conveying solid particles in underwater mining

Abstract

The invention relates to an airlift pump system for conveying solid particles in underwater mining. The airlift pump system comprises a material collecting system, a lifting system, a pneumatic regulation and control system, a recycling system and the like. The material collecting system collects solid particles and guides the solid particles to a lifting opening of the lifting system, the material collecting system comprises a material containing hopper, a material guiding groove, a material collecting table and the like, the lifting system lifts and separates the solid particles and a liquid mixture, and the lifting system comprises an inclined hole air lift pump and a lifting pipe; the pneumatic regulation and control system comprises an electromagnetic valve, a plurality of auxiliary gas injection chambers, an optical fiber strain sensor, a microwave concentration sensor and the like. The recovery system comprises a gas-liquid separator, an axial flow turbine generator, an energy storage device, a stock bin and the like. Pipeline vibration and ore pulp concentration are monitored in real time through the optical fiber strain sensor and the concentration sensor, a PLC control algorithm is combined, the conventional operation mode, the vibration suppression operation mode and the anti-blocking operation mode are automatically switched, and the safety and stability of the airlift pump are greatly improved. The micro axial flow turbine generator is additionally arranged at the exhaust end, and tail gas kinetic energy is converted into electric energy.

Description

TECHNICAL FIELD

[0001] The present application relates to an air-lift pump system, in particular to an air-lift pump system for underwater mining conveying solid particles, which can improve the safety and stability of the air-lift pump system. BACKGROUND

[0002] The lifting and conveying of solid particles are common processes in many engineering fields. Due to the variety of solid particles, the complexity of physical properties, and the difference of process parameters in different processes, these have posed challenges to the design of solid particle lifting and conveying equipment. For example, underwater mining has attracted much attention in recent years. Underwater mineral resources have attracted much attention due to their important industrial application value. Studies have shown that the seabed of some sea areas is rich in nickel, cobalt, copper, manganese and other key metal elements. These metals have wide applications in high-end equipment manufacturing, new energy materials and other fields.

[0003] In the lifting and conveying equipment of underwater solid particles, the air-lift pump system has become a research hotspot due to its unique advantages. The system realizes the upward conveying of solid particles by using compressed gas as a power source. Compared with conventional hydraulic lifting and mechanical lifting methods, the air-lifting system has no underwater moving parts, and has the advantages of low manufacturing cost, convenient maintenance, long stable operation time, etc. The existing traditional air-lift pump system still faces many technical bottlenecks in underwater application, such as severe pipe vibration during long-distance conveying, which can easily cause structural damage, pipe blockage accidents when conveying high-concentration slurry, serious waste of tail gas energy, and low system energy efficiency. Therefore, it is of practical significance to develop a new type of air-lift pump system that integrates vibration suppression and blockage prevention, energy recovery, and intelligent control. SUMMARY

[0004] In view of the above problems, the main purpose of the present application is to provide an air-lift pump system for underwater mining conveying solid particles, which can improve the safety and stability of the air-lift pump system.

[0005] The present application solves the above technical problems by the following technical scheme: an air-lift pump system for underwater mining conveying solid particles, the air-lift pump system for underwater mining conveying solid particles comprises a collecting system, a lifting system, a pneumatic control system, and a recovery system.

[0006] The collecting system collects solid particles and guides the solid particles to the lifting port of the lifting system. The collecting system comprises a material holding hopper, a material guiding chute, and a collecting table. The material guiding chute is arranged straight through the material holding hopper below the collecting table, so as to guide the solid particles and liquid mixture to the lifting pipe of the lifting system directly below.

[0007] The lifting system lifts and separates the solid particles and liquid mixture, and comprises a draft tube, a draft hole air-lift pump, a flange of the draft hole air-lift pump being connected with the flange of the material hopper below, and a flange of the draft tube being connected with the flange of the material hopper above, an air inlet of the draft hole air-lift pump being connected with a first air source, and an air inlet passage being provided between the first air source and the draft hole air-lift pump, and a pressure sensor and a gas flow meter being arranged on the air inlet passage.

[0008] The pneumatic control system comprises an electromagnetic valve, a plurality of auxiliary air injection chambers, an optical fiber strain sensor and a microwave concentration sensor, the auxiliary air injection chambers are arranged on the axial of the draft tube at preset intervals, the auxiliary air injection chambers are communicated with the second air source through the electromagnetic valve, a control end of the electromagnetic valve is connected with a computer control system, a pressure sensor is arranged on a pipeline downstream of the electromagnetic valve, the optical fiber strain sensor and the microwave concentration sensor are arranged on the pipeline wall below the auxiliary air injection chambers, and the optical fiber strain sensor and the microwave concentration sensor are connected with the computer control system as input ends.

[0009] The recovery system comprises a gas-liquid separator, an axial flow turbine generator, an energy storage device and a stock bin, the gas-liquid separator is provided with a horizontal port and an inclined port at the bottom, the horizontal port is connected with the outlet of the draft tube, the inclined port is connected with the stock bin through a pipeline, a screen is arranged in the stock bin, the gas-liquid separator is provided with a gas outlet at the top, the gas outlet is connected with the inlet of the axial flow turbine generator through a pipeline, a hydrophobic air-permeable membrane is arranged in the pipeline between the gas outlet and the axial flow turbine generator, and the output end of the axial flow turbine generator is connected with the energy storage device composed of supercapacitors.

[0010] In specific embodiments of the present application, the material hopper is provided with a uniform distribution of microporous structures at the bottom.

[0011] In specific embodiments of the present application, the draft hole air-lift pump is provided with an annular air injection chamber, a total air inlet is formed in the side wall, and a plurality of air injection holes with upward inclination are uniformly distributed on the inner wall of the air chamber.

[0012] In specific embodiments of the present application, the number of air injection holes ranges from 30 to 100, the diameter of the air injection holes ranges from 2 to 5 mm, and the inclination ranges from 30 to 60°.

[0013] In specific embodiments of the present application, the optical fiber strain sensor is used to monitor the transverse amplitude of the draft tube, when the transverse amplitude exceeds a set threshold value, a signal is transmitted to the computer PLC system, at this time, a vibration suppression mode is started, the computer control system controls the electromagnetic valve to be opened, high-pressure high-frequency pulse air is injected through the auxiliary air injection chamber, and the air injection frequency avoids the natural frequency of the pipeline, so that the vibration of the pipeline is suppressed.

[0014] In specific embodiments of the present application, the microwave concentration sensor is used to monitor the local solid phase concentration in the riser pipe, and when the concentration exceeds a set threshold, a signal is transmitted to the computer PLC system, at which time the anti-blocking mode is started, and the computer controls the electromagnetic valve to adjust to a low-pressure steady-flow air inlet mode to prevent pipe blockage.

[0015] In specific embodiments of the present application, the gas-liquid separator adopts a vertical structure design, with a gas outlet at the top directly opposite the riser pipe outlet position, and a gradually expanding conical structure at the bottom. The mixed fluid enters through the riser pipe and impacts the hydrophobic gas-permeable membrane arranged in the middle of the gas-liquid separator. The gas passes through the filter membrane and is discharged from the top gas outlet. The solid-liquid two-phase mixture falls back to the gradually expanding bottom after the impact and slides down the conical surface to the bin connected at the bottom under the action of gravity, and is separated by the screen mesh. The hydrophobic gas-permeable membrane is made of polytetrafluoroethylene, and the pore size of the hydrophobic gas-permeable membrane can ensure the smooth passage of gas and effectively block the solid-liquid two-phase from entering the axial flow turbine generator.

[0016] In specific embodiments of the present application, the electrical energy storage device is a supercapacitor group energy storage device, which converts the recovered gas kinetic energy into electrical energy for storage and provides auxiliary power supply for each sensor in the system.

[0017] In specific embodiments of the present application, the axial flow turbine generator outlet is provided with a one-way air valve to prevent external air from flowing back into the gas-liquid separator. The flange connection between the auxiliary air injection chamber and the riser pipe adopts a quick-release structure.

[0018] In specific embodiments of the present application, the computer control system adopts a PLC controller with a multi-mode control algorithm that can automatically switch between normal operation mode, vibration suppression mode and anti-blocking mode according to sensor signals.

[0019] The positive progress effect of the present application is that the air lift pump system for underwater mining and conveying solid particles provided by the present application has the following advantages: The air lift pump system for underwater mining and conveying solid particles provided by the present application can monitor pipe vibration and slurry concentration in real time through the optical fiber strain sensor and the concentration sensor, and automatically switch between normal, vibration suppression and anti-blocking operation modes by combining the PLC control algorithm, thereby greatly improving the safety and stability of the air lift pump system. The air lift pump system for underwater mining and conveying solid particles provided by the present application can flexibly disassemble key components such as the air pump and the auxiliary air injection chamber, greatly shortening the time for underwater replacement, and additionally reserving an observation interface for real-time observation of the flow pattern evolution in the pipe by adding a pressure-resistant observation window. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1It is the overall structure schematic diagram of the present application.

[0021] Figure 2 It is the structure schematic diagram of the inclined hole air-lift pump in the present application.

[0022] The following is the name corresponding to the mark in the present application: Figure 1 In: 1-pressure sensor, 2-flow meter, 3-solenoid valve, 4-inclined hole air-lift pump, 5-hopper, 6-arc-shaped material guide chute, 7-material collecting platform, 8-lifting pipe, 9-assistant air injection chamber, 10-fiber optic strain sensor, 11-microwave concentration sensor, 12-gas-liquid separator, 13-hydrophobic air permeable membrane, 14-axial flow turbine generator, 15-one-way air valve, 16-energy storage device, 17-silo, 18-sieve.

[0023] Figure 2 In: 401-inlet, 402-air injection hole, 403-gas chamber outer wall, 404-gas chamber inner wall. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present application are given below in combination with the drawings to explain the technical solutions of the present application in detail.

[0025] Figure 1 It is the overall structure schematic diagram of the present application. Asshown is a kind of air-lift pump system for underwater mining and conveying solid particles proposed in the present application, which includes four parts, mainly including material collecting system, lifting system, pneumatic control system, recycling system. Figure 1

[0026] Material collecting system includes hopper 5, arc-shaped material guide chute 6, material collecting platform 7. Material collecting platform 7 is connected with feeding system, arc-shaped material guide chute 6 is arranged below material collecting platform 7, which is used to guide solid particles to the just below inlet of lifting pipe 8, so that solid particles enter lifting pipe 8, and the bottom of hopper 5 is provided with uniformly distributed microporous structure, which can effectively prevent solid material leakage and ensure the balance of internal and external seawater pressure.

[0027] Lifting system is composed of inclined hole air-lift pump 4 and lifting pipe 8. Inclined hole air-lift pump 4 is connected with hopper 5 and lifting pipe 8 respectively through flange. As Figure 2As shown, the inclined-hole gas-lift pump 4 is provided with an annular gas injection chamber, and the inner wall 404 of the gas chamber is uniformly provided with a plurality of rows and columns of gas injection holes 402 along the circumference, each of which has a diameter of 2-5 mm, generally 3 mm, and an inclination angle of 30-60°, generally 45°; the gas inlet 401 of the inclined-hole gas-lift pump 4 is connected to the first gas source, and a pressure sensor 1 and a gas flow meter 2 are sequentially installed on the gas inlet passage; the riser 8 adopts a multi-section short pipe flange connection structure, which is convenient for underwater environmental installation and maintenance; the compressed gas enters the annular gas injection chamber through the gas inlet 401, enters the riser 8 through the gas injection holes 402, and under the action of the density difference, the solid-liquid two-phase flow in the material hopper 5 is lifted into the riser 8; under the condition of continuous aeration, the gas-liquid-solid three-phase reaches the top of the riser 8.

[0028] The pneumatic control system includes an electromagnetic valve 3, an auxiliary gas injection chamber 9, an optical fiber strain sensor 10, and a microwave concentration sensor 11; the auxiliary gas injection chamber 9 is arranged along the axis of the riser 8 at a predetermined interval by flange connection; the auxiliary gas injection chamber 9 is connected to the second gas source through the electromagnetic valve 3; the control end of the electromagnetic valve 3 is connected to the computer control system; a pressure sensor 1 is arranged on the pipeline downstream of the electromagnetic valve 3 to monitor the gas injection pressure; the optical fiber strain sensor 10 and the microwave concentration sensor 11 are arranged on the lower wall of the auxiliary gas injection chamber 9; each sensor is connected to the computer control system as an input end; the computer control system adopts a PLC controller with a built-in multi-mode control algorithm; when the flow in the riser 8 is in a normal state, the electromagnetic valve 3 does not work in the normal mode; the optical fiber strain sensor 10 monitors the transverse vibration amplitude of the riser 8 in real time; when the vibration amplitude exceeds the set threshold, the control system starts the vibration suppression mode and controls the electromagnetic valve 3 to perform high-pressure high-frequency pulse aeration; the microwave concentration sensor 11 monitors the solid phase concentration in the riser 8 in real time; when the concentration exceeds the set threshold, the control system starts the anti-blocking mode and controls the electromagnetic valve 3 to adjust to a low-pressure steady-flow aeration mode.

[0029] The recovery system includes a gas-liquid separator 12, an axial flow turbine generator 14, an energy storage device 16, and a bin 17; the gas-liquid separator 12 is provided with a flat mouth and an inclined mouth, wherein the flat mouth is connected to the outlet of the riser 8, and the inclined mouth is connected to the bin 17 through a pipeline; a screen 18 is arranged in the bin 17 for solid-liquid separation; the gas-liquid separator 12 is provided with a gas outlet at the top, which is connected to the inlet of the axial flow turbine generator 14 through a pipeline; a hydrophobic air-permeable membrane 13 made of polytetrafluoroethylene (PTFE) material is arranged in the pipeline between the gas outlet and the axial flow turbine generator 14, which can effectively prevent liquid from entering the axial flow turbine generator 14; a one-way valve 15 is installed on the outlet pipeline of the axial flow turbine generator 14 to prevent external air from flowing back; the output end of the axial flow turbine generator 14 is connected to the energy storage device 16 composed of supercapacitor groups to provide auxiliary power supply for each sensor in the system.

[0030] When the gas lift pump system is running, the feeding system delivers solid particles to the material collecting table 7, which is guided to the hopper 5 through the arc-shaped guide chute 6, and the lifting pipe 8 is directly below the hopper 5; after starting the first gas source, the compressed gas enters the lifting pipe 8 through the injection hole 402 of the inclined hole air pump 4, and under the action of air lift, the solid-liquid two-phase in the hopper 5 enters the lifting pipe 8 to form a gas-liquid-solid three-phase flow, and the three-phase flow rises to the top of the lifting pipe 8 and reaches the gas-liquid separator 12; the gas drives the axial flow turbine generator 14 to generate electricity through the hydrophobic air permeable membrane 13, which is used as an auxiliary power supply for various sensors, and the solid-liquid two-phase enters the silo 17 under the action of gravity, and the ore is separated from the seawater under the action of the screen 18, and the ore is stored in the silo, and the seawater returns to the ocean; the system is monitored in real time by the optical fiber strain sensor 10 and the microwave concentration sensor 11, and under the normal working condition of the gas lift pump system, the control system is in the normal mode, and the electromagnetic valve 3 does not work; when a certain optical fiber strain sensor 10 located on the pipe wall monitors that the transverse vibration amplitude of the lifting pipe 8 exceeds the set threshold value, the second gas source starts, the control system starts the vibration suppression mode, and the electromagnetic valve 3 controls the high-pressure high-frequency pulse air inlet until the vibration returns to a reasonable range, and the control system closes the vibration suppression mode and returns to the normal mode; similarly, when the microwave concentration sensor 11 monitors that the local solid phase concentration in the lifting pipe 8 reaches an abnormal value, the control system starts the anti-blocking mode, the second gas source starts to control the electromagnetic valve 3 to adjust to the low-pressure steady flow air inlet mode until the concentration returns to a reasonable range, and the control system closes the anti-blocking mode and returns to the normal mode, so that the intelligent control and stable operation of the underwater solid particle lifting and conveying process are realized.

[0031] The gas lift pump system for underwater mining and conveying solid particles can realize real-time monitoring of pipeline vibration and ore pulp concentration through the optical fiber strain sensor and the concentration sensor, automatically switch three running modes of normal, vibration suppression and anti-blocking in combination with the PLC control algorithm, and greatly improve the safety and operation stability of the gas lift pump system.

[0032] In the embodiment of the application, the operation of the gas-lift pump system is divided into three working conditions: normal mode, vibration suppression mode and anti-blocking mode. The PLC controller automatically switches according to the sensor signals. The normal mode is the default running state of the system. At this time, the electromagnetic valves of each auxiliary gas injection chamber remain closed, and the gas-lift pump relies on the continuous gas flow provided by the main gas source to drive the solid-liquid two-phase into the riser pipe, realizing stable lifting. The PLC only monitors and records the pressure and flow, and does not make additional adjustments. If the optical fiber strain sensor detects that the transverse vibration amplitude of the riser pipe exceeds the preset threshold A, the control system determines that the vibration is too large and automatically switches to the vibration suppression mode. In the vibration suppression mode, the PLC controls the electromagnetic valve to open in the form of high-pressure high-frequency pulse. The pulse frequency is set to avoid the natural frequency of the pipeline, forming disturbance inside the pipeline to offset structural vibration until the amplitude returns to a safe range, and the system automatically returns to the normal mode after a few seconds of delay. When the microwave concentration sensor detects that the local solid phase concentration in the riser pipe exceeds the threshold B, the control system determines that there is a risk of blockage and immediately switches to the anti-blocking mode. In the anti-blocking mode, the PLC controls the electromagnetic valve to open stably and maintain low-pressure steady-flow gas injection to ensure the formation of continuous bubble disturbance, dilute high-concentration particle areas, avoid particle deposition and blockage, and maintain the continuity of transportation. The anti-blocking mode has the highest priority. Even if vibration and blockage signals occur at the same time, the system will preferentially enter the anti-blocking mode, and after the concentration returns to below the safe threshold and remains for a certain delay, it will return to the normal running state. The threshold parameters of each mode can be adjusted in real time through the human-machine interface to adapt to different sea conditions or properties of the ore slurry.

[0033] The gas-lift pump system for underwater mining and conveying solid particles of the application can convert the kinetic energy of the exhaust gas into electrical energy by adding a micro axial flow turbine generator at the exhaust end, store it in a super capacitor, and preferentially supply power to the sensors and PLC. This design reduces the dependence on external power supply, improves energy utilization rate, and reduces the overall energy consumption of the system.

[0034] In the embodiments of the present application, the process of converting the tail gas kinetic energy into electrical energy mainly relies on the micro axial flow turbine generator installed after the gas outlet of the gas-liquid separator. The gas-liquid-solid three-phase flow in the pipe reaches the riser outlet, and after entering the gas-liquid separator, the gas is separated by the hydrophobic gas-permeable membrane and gathered at the inlet of the micro axial flow turbine generator. Since continuous gas supply is required during the underwater mining process to maintain the lifting effect of the gas-lift pump, the discharge period of the tail gas is stable and has a certain pressure and flow rate, so it can directly drive the turbine blades to rotate. The rotor of the axial flow turbine generator is connected to a micro generator, which generates rotary mechanical energy in the process of continuous gas impact on the blades, and then converts it into electrical energy through electromagnetic induction. The output electrical energy is stored in the super capacitor group after rectification and voltage stabilization, providing auxiliary power supply for the optical fiber strain sensor, microwave concentration sensor and PLC controller, thereby realizing partial self-sufficiency of the system. A similar tail gas recovery power generation device has been disclosed in patent CN116241340A. The present application adds a gas-permeable water membrane and a super capacitor group structure to adapt to the energy storage needs of underwater working conditions.

[0035] The gas-lift pump system for underwater mining and conveying solid particles of the present application can flexibly disassemble the key components such as the air pump and the auxiliary gas injection chamber, greatly shortening the time for underwater replacement. In addition, an observation interface is reserved, and a pressure-resistant observation window can be added to observe the flow pattern evolution in the pipe in real time.

[0036] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An airlift pump system for conveying solid particles in underwater mining, characterized in that: The airlift pump system for conveying solid particles in underwater mining includes a material collection system, a lifting system, a pneumatic control system, and a recovery system. The collection system collects solid particles and guides them to the lifting port of the lifting system. The collection system includes a hopper, a guide chute, and a collection platform. The guide chute is located below the collection platform and leads directly into the hopper so as to guide the mixture of solid particles and liquid to the lifting pipe of the lifting system. The lifting system lifts and separates a mixture of solid particles and liquid. The lifting system includes an inclined hole air lift pump and a lifting pipe. The inclined hole air lift pump is connected to the flange of the hopper at the bottom and to the flange of the lifting pipe at the top. The air inlet of the inclined hole air lift pump is connected to a first air source. There is an air intake passage between the first air source and the inclined hole air lift pump. A pressure sensor and a gas flow meter are installed on the air intake passage. The pneumatic control system includes a solenoid valve, several auxiliary gas injection chambers, an optical fiber strain sensor, and a microwave concentration sensor. The several auxiliary gas injection chambers are connected to the riser pipe and arranged axially at a preset interval. The auxiliary gas injection chambers are connected to a second gas source through the solenoid valve. The control end of the solenoid valve is connected to a computer control system. A pressure sensor is installed on the pipeline downstream of the solenoid valve. The optical fiber strain sensor and the microwave concentration sensor are respectively installed on the pipe wall below the auxiliary gas injection chamber. The optical fiber strain sensor and the microwave concentration sensor are connected to the computer control system as input ends. The recovery system includes a gas-liquid separator, an axial flow turbine generator, an energy storage device, and a silo. The gas-liquid separator has a flat opening and an inclined opening at its bottom. The flat opening is connected to the outlet of the riser pipe, and the inclined opening is connected to the silo through a pipeline. A screen is installed inside the silo. The gas separator has a gas outlet at its top, which is connected to the inlet of the axial flow turbine generator through a pipeline. A hydrophobic and breathable membrane is installed in the pipeline between the gas outlet and the axial flow turbine generator. The output end of the axial flow turbine generator is connected to an energy storage device consisting of a supercapacitor bank.

2. The airlift pump system for conveying solid particles in underwater mining according to claim 1, characterized in that: The bottom of the hopper is provided with a uniformly distributed microporous structure.

3. The airlift pump system for conveying solid particles in underwater mining according to claim 1, characterized in that: The inclined hole air lift pump is equipped with an annular air injection chamber, with a main air inlet on the side wall, and several upward-angled air injection holes are evenly distributed on the circumferential wall of the chamber.

4. The airlift pump system for conveying solid particles in underwater mining according to claim 3, characterized in that: The number of air injection holes ranges from 30 to 100, the diameter of the air injection holes ranges from 2 to 5 mm, and the inclination angle ranges from 30 to 60°.

5. The airlift pump system for conveying solid particles in underwater mining according to claim 1, characterized in that: The fiber optic strain sensor is used to monitor the lateral amplitude of the riser pipe. When the lateral amplitude exceeds the set threshold, the signal is transmitted to the computer PLC system. At this time, the vibration suppression mode is activated. The computer control system controls the solenoid valve to open and high-pressure high-frequency pulse air is introduced through the auxiliary air injection chamber. The air intake frequency avoids the natural frequency of the pipeline, thereby suppressing the vibration of the pipeline.

6. The airlift pump system for conveying solid particles in underwater mining according to claim 1, characterized in that: The microwave concentration sensor is used to monitor the local solid phase concentration in the riser pipe. When the concentration exceeds the set threshold, the signal is transmitted to the computer PLC system. At this time, the anti-blocking mode is activated, and the computer controls the solenoid valve to adjust to the low-pressure steady flow air intake mode to prevent pipeline blockage.

7. The airlift pump system for conveying solid particles in underwater mining according to claim 1, characterized in that: The gas-liquid separator adopts a vertical structure design. The top of the separator has a gas outlet directly opposite the outlet of the riser pipe, and the bottom adopts a gradually expanding conical structure. After the mixed fluid enters through the riser pipe, it impacts the hydrophobic and breathable membrane set in the middle of the gas-liquid separator. The gas passes through the filter membrane and is discharged from the top gas outlet. The solid-liquid mixture falls back to the gradually expanding bottom after the impact and slides down the conical surface under the action of gravity to the material bin connected to the bottom. It then passes through the screen to achieve liquid-solid separation. The hydrophobic and breathable membrane is made of polytetrafluoroethylene. The pore size of the hydrophobic and breathable membrane can ensure that the gas can pass through smoothly while effectively blocking the solid and liquid phases from entering the axial flow turbine generator.

8. The airlift pump system for conveying solid particles in underwater mining according to claim 1, characterized in that: The energy storage device is an energy storage device composed of supercapacitor banks. The energy storage device converts the recovered gas kinetic energy into electrical energy and stores it to provide auxiliary power supply for various sensors in the system.

9. The airlift pump system for conveying solid particles in underwater mining according to claim 1, characterized in that: The axial flow turbine generator outlet is equipped with a one-way air valve to prevent outside air from flowing back into the gas-liquid separator; the flange connection between the auxiliary air injection chamber and the riser pipe adopts a quick-release structure.

10. The airlift pump system for conveying solid particles in underwater mining according to claim 1, characterized in that: The computer control system uses a PLC controller with built-in multi-mode control algorithms, which can automatically switch between normal operation mode, vibration suppression mode and anti-blocking mode according to sensor signals.

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