A frictional charging system and a method for switching the working state thereof

Abstract

The present application relates to the technical field of frictional charging electric separation, and discloses a frictional charging system and a working state switching method thereof, which comprises a friction chamber, a micro-particle pneumatic conveying pipe, a gas conveying pipe, a charged particle conveying pipe, a tail gas conveying pipe and a processor; the friction chamber is connected with a feeding pipe, an air inlet pipe, a discharging pipe and an air outlet pipe, and the feeding pipe, the air inlet pipe, the discharging pipe and the air outlet pipe are respectively provided with a feeding valve, an air inlet valve, a discharging valve and an exhaust valve; the feeding valve, the air inlet valve, the discharging valve and the exhaust valve are electrically connected with the processor; the present application can clean and purge the friction chamber, remove the adhesion and contamination on the friction surface, ensure the effective collision between the micro-particles and the friction surface, and thus ensure the charge-to-mass ratio of the charged particles formed by the micro-particles, which is beneficial to improving the separation efficiency of the charged particles in the subsequent electrostatic field.

Description

Technical Field

[0001] This invention relates to the field of triboelectric electrostatic separation technology, and in particular to a triboelectric system and a method for switching its operating states. Background Technology

[0002] Depending on the power source, triboelectric charging can be divided into two categories. One category uses mechanical force or the gravity of the mineral itself as the power source for ore conveying, including vibrating troughs, sluices, rotating cylinders, turbines, etc., which often have disadvantages such as low charge capacity, uneven charge of mineral particles, poor charge selectivity, and easy wear of equipment. The other category uses airflow as the power source for ore conveying, including fluidized beds, air cyclones, etc., which have better charging effect, are more adaptable to a wide range of ore properties, are easy to match with subsequent sorting, and have controllable dust pollution, and are considered to have good prospects.

[0003] The friction chamber is a key device affecting the efficiency of triboelectric separation of fine particles. When fine particles enter the friction chamber, due to frequent collisions and friction between particles and between particles and the friction surface, the surfaces of particles with different components will carry charges of opposite polarities to form charged particles. After the charged particles with opposite charges enter the electrostatic field, they can be effectively separated under the action of opposite electric field forces.

[0004] Currently, during the continuous feeding process in the friction chamber, fine particles adhere and contaminate the friction surface, reducing the effective collision between the fine particles and the friction surface. This reduces the charge-to-mass ratio of the charged particles, leading to a decrease in the sorting efficiency of the charged particles in the subsequent electrostatic field. Summary of the Invention

[0005] The purpose of this invention is to provide a triboelectric charging system and its working state switching method, which can clean and purge the friction chamber to remove adhesion and contamination on the friction surface, ensuring effective collision between fine particles and the friction surface, thereby ensuring the charge-to-mass ratio of the charged particles formed by the fine particles, which is beneficial to improving the sorting efficiency of charged particles in the subsequent electrostatic field.

[0006] To achieve the above objectives, the present invention provides a triboelectric charging system, comprising a triboelectric chamber, a fine particle pneumatic conveying pipe, a gas conveying pipe, a charged particle conveying pipe, an exhaust gas conveying pipe, and a processor.

[0007] The friction chamber is connected to a feed pipe, an air inlet pipe, a discharge pipe, and an air outlet pipe. Each of these pipes is equipped with a feed valve, an air inlet valve, a discharge valve, and an exhaust valve. The fine particle pneumatic conveying pipe is connected to the end of the feed pipe furthest from the friction chamber. The gas conveying pipe is connected to the end of the air inlet pipe furthest from the friction chamber. The charged particle conveying pipe is connected to the end of the discharge pipe furthest from the friction chamber. The exhaust gas conveying pipe is connected to the end of the exhaust pipe furthest from the friction chamber. The feed valve, air inlet valve, discharge valve, and exhaust valve are all electrically connected to the processor.

[0008] The fine particle pneumatic conveying pipe can feed fine particles into the friction chamber through the feed pipe; the fine particles are particles with a particle size of less than 100μm; the gas conveying pipe can feed purging gas into the friction chamber through the air inlet pipe; the friction chamber can feed charged particles into the charged particle conveying pipe through the discharge pipe; the friction chamber can send the purged gas into the exhaust gas conveying pipe through the exhaust pipe.

[0009] Preferably, the triboelectric charging system further includes a charge-to-mass ratio measuring device electrically connected to the processor, the charge-to-mass ratio measuring device being mounted on the discharge pipe.

[0010] The charge-to-mass ratio measuring device is used to measure the charge-to-mass ratio of charged particles in the discharge pipe. By setting up and installing the charge-to-mass ratio measuring device on the discharge pipe, the processor can determine whether the friction chamber needs to switch between triboelectric charging and gas purging states based on the charge-to-mass ratio of the charged particles. The charge-to-mass ratio measuring device is prior art, and how to measure the charge-to-mass ratio of particles using this device is also prior art, and will not be elaborated upon here.

[0011] Preferably, the discharge valve and the charge-to-mass ratio measuring device are sequentially installed on the discharge pipe along the direction from the friction chamber to the charged particle conveying pipe.

[0012] Preferably, the friction chamber is equipped with multiple rows of friction rods arranged along the feeding direction of the friction chamber. Each row of the friction rods includes multiple friction rods distributed at intervals. The friction rods in adjacent rows of the friction rods are staggered along the feeding direction of the friction chamber. This can effectively improve the uniform conveying of fine particles and the collision frequency.

[0013] Preferably, there are multiple friction chambers, which are arranged in parallel. The cleaning and purging work can be carried out between the multiple parallel friction chambers by alternating switching, so as to ensure continuous feeding of fine particles and continuous discharge of charged particles, thereby improving the output of the triboelectric system and the cycle of continuous and efficient operation.

[0014] Preferably, the medium transported by the gas delivery pipe is steam, and the medium transported by the exhaust gas delivery pipe is steam exhaust gas. Alternatively, the medium transported by the gas delivery pipe may also be nitrogen, compressed air, etc.

[0015] More preferably, the triboelectric charging system further includes an exhaust gas recovery mechanism, which is connected to the exhaust gas delivery pipe.

[0016] More preferably, the exhaust gas recovery mechanism includes an induced draft fan, a cyclone separator, and a cooling pool connected in sequence by pipelines.

[0017] More preferably, the triboelectric charging system further includes a temperature transmitter and a heater; the temperature transmitter is mounted on the exhaust gas delivery pipe; the exhaust gas delivery pipe is connected to the induced draft fan through the heater.

[0018] More preferably, the temperature transmitter is installed at the outlet end of the exhaust gas delivery pipe to measure the steam exhaust temperature at the total outlet of the exhaust gas delivery pipe.

[0019] The present invention also provides a method for switching the operating state of a triboelectric charging system, comprising the following steps:

[0020] Switching from triboelectric charging working state to gas purging working state: The processor controls the feed valve and discharge valve to close, and controls the air inlet valve and exhaust valve to open. The gas delivery pipe sends the gas into the friction chamber through the air inlet pipe for cleaning and purging and forms exhaust gas. The exhaust gas is sent into the exhaust gas delivery pipe through the air outlet pipe.

[0021] Switching from gas purging mode to triboelectric charging mode: The processor controls the inlet valve and exhaust valve to close, and controls the feed valve and discharge valve to open. The fine particle pneumatic conveying pipe sends the fine particles into the friction chamber through the feed pipe for collision and friction, so that the surface of the fine particles is charged to form charged particles. The charged particles are sent into the charged particle conveying pipe through the discharge pipe.

[0022] Preferably, the processor determines whether the friction chamber needs to switch between triboelectric charging and gas purging states based on the charge-to-mass ratio of the charged particles. Alternatively, the processor can periodically switch between the triboelectric charging and gas purging states based on the duration of each state; however, this periodic switching method is less effective than the charge-to-mass ratio switching method.

[0023] More preferably, the processor determines whether the friction chamber switches between the triboelectric charging state and the gas purging state based on the charge-to-mass ratio detected by the charge-to-mass ratio measuring device for charged particles.

[0024] Specifically, the processor is set with a preset particle charge-to-mass ratio value, the charge-to-mass ratio measuring device detects the particle charge-to-mass ratio measurement value and transmits the particle charge-to-mass ratio measurement value to the processor, and the processor compares the preset particle charge-to-mass ratio value with the particle charge-to-mass ratio measurement value; when the particle charge-to-mass ratio measurement value is less than the preset particle charge-to-mass ratio value, the friction chamber 1 switches from the triboelectric charging working state to the gas purging working state; when the particle charge-to-mass ratio measurement value is greater than or equal to the preset particle charge-to-mass ratio value, the friction chamber 1 switches from the triboelectric charging working state to the gas purging working state.

[0025] Compared with the prior art, the triboelectric charging system of this invention has the following advantages: by controlling the opening of the inlet valve and the exhaust valve through the processor, the gas in the gas delivery pipe can be sent into the friction chamber, and the friction surface of the friction chamber can be cleaned and blown to remove the adhesion and contamination on the friction surface. This ensures effective collision between the fine particles and the friction surface, thereby ensuring the charge-to-mass ratio of the charged particles formed by the fine particles, which is beneficial to improving the sorting efficiency of the charged particles in the subsequent electrostatic field. Attached Figure Description

[0026] Figure 1 This is a structural diagram of a triboelectric charging system provided in an embodiment of the present invention;

[0027] Figure 2 This is a structural diagram of the friction chamber provided in an embodiment of the present invention.

[0028] In the diagram, 1 is the friction chamber; 11 is the feed pipe; 12 is the air inlet pipe; 13 is the discharge pipe; 14 is the air outlet pipe; 15 is the feed valve; 16 is the air inlet valve; 17 is the discharge valve; and 18 is the exhaust valve.

[0029] 2. Pneumatic conveying pipe for fine particles;

[0030] 3. Gas delivery pipe;

[0031] 4. Charged particle conveying pipe;

[0032] 5. Exhaust gas delivery pipe;

[0033] 6. Processor;

[0034] 7. Charge-to-mass ratio measuring device;

[0035] 81. Exhaust fan; 82. Cyclone separator; 83. Cooling pool;

[0036] 20. Temperature transmitter; 30. Heater;

[0037] 100. Friction rod. Detailed Implementation

[0038] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0039] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] like Figure 1-2 As shown, a preferred embodiment of the triboelectric charging system of the present invention includes a triboelectric chamber 1, a fine particle pneumatic conveying pipe 2, a gas conveying pipe 3, a charged particle conveying pipe 4, an exhaust gas conveying pipe 5, and a processor 6.

[0042] The friction chamber 1 is connected to a feed pipe 11, an air inlet pipe 12, a discharge pipe 13, and an air outlet pipe 14. The feed pipe 11, air inlet pipe 12, discharge pipe 13, and air outlet pipe 14 are respectively equipped with a feed valve 15, an air inlet valve 16, a discharge valve 17, and an exhaust valve 18. The fine particle pneumatic conveying pipe 2 is connected to the end of the feed pipe 11 away from the friction chamber 1. The gas conveying pipe 3 is connected to the end of the air inlet pipe 12 away from the friction chamber 1. The charged particle conveying pipe 4 is connected to the end of the discharge pipe 13 away from the friction chamber 1. The exhaust gas conveying pipe 5 is connected to the end of the exhaust pipe 14 away from the friction chamber. The feed valve 15, air inlet valve 16, discharge valve 17, and exhaust valve 18 are all electrically connected to the processor 6.

[0043] The fine particles conveyed by the pneumatic conveying pipe 2 are particles with a diameter of less than 100μm; the medium conveyed by the gas conveying pipe 3 is steam, and the medium conveyed by the exhaust gas conveying pipe 5 is steam exhaust gas.

[0044] The fine particle pneumatic conveying pipe 2 can feed fine particles into the friction chamber 1 through the feed pipe 11; the fine particles are particles with a particle size of less than 100μm; the gas conveying pipe 3 can feed steam into the friction chamber 1 through the air inlet pipe 12; the friction chamber 1 can feed charged particles into the charged particle conveying pipe 4 through the discharge pipe 13; the friction chamber 1 can send steam tail gas into the tail gas conveying pipe 5 through the air outlet pipe 14.

[0045] Preferably, the processor 6 is a PLC controller.

[0046] Based on this technical solution, the present invention can control the opening of the inlet valve 16 and the exhaust valve 18 through the processor 6, send the steam in the gas delivery pipe 3 into the friction chamber 1, and clean and blow away the friction surface of the friction chamber 1 to remove the adhesion and contamination on the friction surface, thereby ensuring the effective collision between the fine particles and the friction surface, and thus ensuring the charge-to-mass ratio of the charged particles formed by the fine particles, which is beneficial to improving the sorting efficiency of the charged particles in the subsequent electrostatic field.

[0047] For details, see Figure 1 and Figure 2 In one embodiment, the charged friction system further includes a charge-to-mass ratio measuring device 7 electrically connected to the processor 6. The charge-to-mass ratio measuring device 7 is installed on the discharge pipe 13 and is used to measure the charge-to-mass ratio of the charged particles in the discharge pipe 13.

[0048] The charge-to-mass ratio measuring device 7 is set up and installed on the discharge pipe 13, so that the processor 6 can determine whether the friction chamber 1 needs to switch between the triboelectric charging working state and the gas purging working state based on the charge-to-mass ratio of the charged particles.

[0049] Preferably, the discharge valve 17 and the charge-to-mass ratio measuring device 7 are sequentially installed on the discharge pipe 13 along the direction from the friction chamber 1 to the charged particle conveying pipe 4. This design facilitates the maintenance and replacement of the charge-to-mass ratio measuring device 7.

[0050] For details, see Figure 1 and Figure 2 In one embodiment, the friction chamber 1 is equipped with multiple rows of friction rods arranged along the feeding direction of the friction chamber 1. Each row of the friction rods includes multiple friction rods 100 spaced apart. The friction rods 100 in adjacent rows of the friction rods are staggered along the feeding direction of the friction chamber. This design can effectively improve the uniform conveying of fine particles and the collision frequency.

[0051] For details, see Figure 1 and Figure 2 In one embodiment, the number of friction chambers 1 is multiple, and the multiple friction chambers 1 are arranged in parallel. Cleaning and purging operations can be performed between the multiple parallel friction chambers by alternating switching, ensuring continuous feeding of fine particles and continuous discharge of charged particles, thereby improving the output of the triboelectric charging system and the cycle of continuous and efficient operation.

[0052] The fine particle pneumatic conveying pipe 2 is the main pneumatic conveying pipe for fine particles, the gas conveying pipe 3 is the main gas conveying pipe, the charged particle conveying pipe 4 is the main charged particle conveying pipe, and the exhaust gas conveying pipe 5 is the main exhaust gas conveying pipe. That is, the frictional fine particle pneumatic conveying, gas conveying, charged particle conveying and exhaust gas conveying all adopt the main pipe.

[0053] For details, see Figure 1 In one embodiment, the triboelectric charging system further includes a tail gas recovery mechanism, which is connected to the tail gas delivery pipe 5. Using the tail gas recovery mechanism to recover steam tail gas can save water resources.

[0054] Preferably, the exhaust gas recovery mechanism includes an induced draft fan 81, a cyclone separator 82, and a cooling pool 83 connected in sequence by pipes, and the induced draft fan 81 and the cyclone separator 82 are both electrically connected to the processor 6.

[0055] The steam tail gas in the exhaust gas conveying pipe 5 enters the cyclone separator 82 for dust removal under the action of the induced draft fan 81. The dust-removed steam tail gas enters the cooling pool 86 for recovery. By using the induced draft fan 81 and the cyclone separator 82, the steam tail gas can be dust-removed and clean steam tail gas can be recovered.

[0056] More preferably, the triboelectric charging system further includes a temperature transmitter 20 and a heater 30; the temperature transmitter 20 is installed on the exhaust gas delivery pipe 5 and is used to detect the temperature of the steam exhaust in the exhaust gas delivery pipe 5; the inlet end of the heater 30 is connected to the outlet end of the exhaust gas delivery pipe 5, and the outlet end of the heater 30 is connected to the inlet end of the induced draft fan 81.

[0057] Preferably, the temperature transmitter 20 is installed at the outlet end of the exhaust gas delivery pipe 5 to measure the steam exhaust temperature at the total outlet of the exhaust gas delivery pipe 5.

[0058] Furthermore, the processor 6 is set with a preset value for the steam tail temperature, and the temperature transmitter 20 detects the measured value of the steam tail temperature. The processor 6 compares the measured value of the steam tail temperature with the preset value of the steam tail temperature. When the measured value of the steam tail temperature is less than the preset value of the steam tail temperature, the processor 6 controls the heater 30 to turn on to heat the steam before it enters the induced draft fan to prevent steam condensation. Under other circumstances, the heater 30 is in the off state.

[0059] See Figure 1 and Figure 2 The present invention also provides a method for switching the operating state of a triboelectric charging system, comprising the following steps:

[0060] Switching from the triboelectric charging working state to the gas purging working state: The processor 6 controls the feed valve 15 and the discharge valve 17 to close, and controls the air inlet valve 16 and the exhaust valve 18 to open. The gas delivery pipe 3 sends steam into the friction chamber 1 through the air inlet pipe 12 for cleaning and purging and forms steam tail steam. The steam tail steam is sent into the tail gas delivery pipe 5 through the air outlet pipe 14.

[0061] Switching from gas purging operation to triboelectric charging operation: The processor 6 controls the inlet valve 16 and the exhaust valve 18 to close, and controls the feed valve 15 and the discharge valve 17 to open. The fine particle pneumatic conveying pipe 2 sends the fine particles into the friction chamber 1 through the feed pipe 11 for collision and friction, so that the surface of the fine particles is charged to form charged particles. The charged particles are sent into the charged particle conveying pipe 4 through the discharge pipe 13.

[0062] Preferably, the processor 6 determines whether the friction chamber 1 needs to switch between the triboelectric charging state and the gas purging state based on the charge-to-mass ratio of the charged particles.

[0063] Specifically, the processor 6 determines whether the friction chamber 1 switches between the triboelectric charging working state and the gas purging working state based on the charge-to-mass ratio detected by the charge-to-mass ratio measuring device 7 for the charged particles.

[0064] More specifically, the processor 6 is set with a preset particle charge-to-mass ratio value, the charge-to-mass ratio measuring device 7 detects the particle charge-to-mass ratio measurement value and transmits the particle charge-to-mass ratio measurement value to the processor 6, and the processor 6 compares the preset particle charge-to-mass ratio value with the particle charge-to-mass ratio measurement value; when the particle charge-to-mass ratio measurement value is less than the preset particle charge-to-mass ratio value, the friction chamber 1 switches from the triboelectric charging working state to the gas purging working state; when the particle charge-to-mass ratio measurement value is greater than or equal to the preset particle charge-to-mass ratio value, the friction chamber 1 switches from the triboelectric charging working state to the gas purging working state.

[0065] In summary, the triboelectric charging system and its operating state switching method provided by the embodiments of the present invention have the following beneficial effects:

[0066] 1. By using the inlet pipe 12, outlet pipe 14, inlet valve 16, and exhaust valve 18, the steam in the gas delivery pipe 3 can be sent into the friction chamber 1 to clean and blow away the friction surface of the friction chamber 1, removing the adhesion and contamination on the friction surface. This ensures effective collision between the fine particles and the friction surface, thereby ensuring the charge-to-mass ratio of the charged particles formed by the fine particles, which is beneficial to improving the sorting efficiency of the charged particles in the subsequent electrostatic field.

[0067] 2. The friction chamber 1 is cleaned and purged with steam. Steam has the advantages of being inexpensive, readily available, and having a good cleaning and purging effect.

[0068] 3. By employing the charge-to-mass ratio measuring device 7 and installing it on the discharge pipe 13, the processor 6 can determine whether the friction chamber 1 needs to switch between the triboelectric charging working state and the gas purging working state based on the charge-to-mass ratio of the charged particles. This ensures the charge-to-mass ratio of the charged particles formed by the fine particles, which is beneficial to improving the sorting efficiency of the charged particles in the subsequent electrostatic field and has a good effect.

[0069] 4. By installing the charge-to-mass ratio measuring device 7 between the discharge valve 17 and the charged particle conveying pipe 4, it is not only beneficial for the accurate measurement of the charge-to-mass ratio of the charged particles by the charge-to-mass ratio measuring device 7, but also convenient for the maintenance and replacement of the charge-to-mass ratio measuring device 7.

[0070] 5. Using at least two rows of the friction rod group, and staggering the friction rods 100 in adjacent rows of the friction rod group, can effectively improve the uniform conveying and collision frequency of fine particles, and increase the charge-to-mass ratio of the charged particles formed by the fine particles.

[0071] 6. The pneumatic conveying, gas conveying, charged particle conveying, and exhaust gas conveying of the microparticles using the mother pipe can achieve the most favorable microparticle distribution and steam distribution among the multiple friction chambers.

[0072] 7. By using multiple friction chambers 1 connected in parallel, cleaning and purging operations can be performed at different times between the multiple friction chambers through alternating switching, ensuring continuous feeding of fine particles and continuous discharge of charged particles, thereby improving the output of the triboelectric charging system and the cycle of continuous and efficient operation.

[0073] 8. By adopting the tail steam recovery mechanism, steam tail steam can be recovered, which can save water resources.

[0074] 9. By using the induced draft fan 81 and cyclone separator 82, the steam tail gas can be treated for dust removal, so that the cooling pool can recover clean steam tail gas.

[0075] 10. By using the temperature transmitter 20 to measure the steam tail temperature of the tail gas conveying pipe 5, the processor 6 can determine whether to turn on the heater 30 to heat the steam tail based on the measurement result, so as to prevent the steam tail from condensing.

[0076] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A triboelectric charging system, characterized in that, include: The friction chamber is connected to a feed pipe, an air inlet pipe, a discharge pipe, and an air outlet pipe. The feed pipe, air inlet pipe, discharge pipe, and air outlet pipe are respectively equipped with a feed valve, an air inlet valve, a discharge valve, and an exhaust valve. A pneumatic conveying pipe for fine particles, wherein the pneumatic conveying pipe for fine particles is connected to the end of the feed pipe away from the friction chamber; A gas delivery pipe, wherein the gas delivery pipe is connected to the end of the air inlet pipe away from the friction chamber; A charged particle conveying pipe, wherein the charged particle conveying pipe is connected to the end of the discharge pipe away from the friction chamber; An exhaust gas delivery pipe is connected to the end of the exhaust pipe away from the friction chamber. The processor, wherein the feed valve, air inlet valve, discharge valve and exhaust valve are all electrically connected to the processor; It also includes a charge-to-mass ratio measuring device electrically connected to the processor, the charge-to-mass ratio measuring device being installed on the discharge pipe for measuring the charge-to-mass ratio of charged particles in the discharge pipe; Along the direction from the friction chamber to the charged particle conveying pipe, the discharge valve and the charge-to-mass ratio measuring device are sequentially installed on the discharge pipe; The medium transported by the gas conveying pipe is steam, and the medium transported by the exhaust gas conveying pipe is steam exhaust gas. The processor is set with a preset value for the charge-to-mass ratio of charged particles. The charge-to-mass ratio measuring device detects the charge-to-mass ratio of charged particles and transmits the measured value to the processor. The processor compares the preset value with the measured value. When the measured value is less than the preset value, the processor controls the feed valve and the discharge valve to close, and controls the air inlet valve and the exhaust valve to open. The gas delivery pipe sends steam into the friction chamber for cleaning and purging through the air inlet pipe to form steam tail gas. The steam tail gas is sent into the tail gas delivery pipe through the air outlet pipe.

2. The triboelectric charging system according to claim 1, characterized in that, The friction chamber is equipped with multiple rows of friction rods arranged along the feeding direction of the friction chamber. Each row of the friction rods includes multiple friction rods spaced apart. The friction rods in adjacent rows of the friction rods are staggered along the feeding direction of the friction chamber.

3. The triboelectric charging system according to claim 1, characterized in that, The number of friction chambers is multiple, and the multiple friction chambers are arranged in parallel.

4. The triboelectric charging system according to claim 1, characterized in that, It also includes an exhaust gas recovery mechanism, which is connected to the exhaust gas delivery pipe.

5. The triboelectric charging system according to claim 4, characterized in that, The exhaust gas recovery mechanism includes an induced draft fan, a cyclone separator, and a cooling pool connected in sequence by pipelines.

6. The triboelectric charging system according to claim 5, characterized in that, It also includes a temperature transmitter and a heater; the temperature transmitter is installed on the exhaust gas delivery pipe; the exhaust gas delivery pipe is connected to the induced draft fan through the heater.

7. A method for switching the operating state of a triboelectric charging system as described in any one of claims 1-6, characterized in that, Includes the following steps: Switching from triboelectric charging working state to gas purging working state: The processor controls the feed valve and discharge valve to close, and controls the air inlet valve and exhaust valve to open. The gas delivery pipe sends the gas into the friction chamber through the air inlet pipe for cleaning and purging and forms exhaust gas. The exhaust gas is sent into the exhaust gas delivery pipe through the air outlet pipe. Switching from gas purging mode to triboelectric charging mode: The processor controls the inlet valve and exhaust valve to close, and controls the feed valve and discharge valve to open. The fine particle pneumatic conveying pipe sends the fine particles into the friction chamber through the feed pipe for collision and friction, so that the surface of the fine particles is charged to form charged particles. The charged particles are sent into the charged particle conveying pipe through the discharge pipe.

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