Mechanical pneumatic double vibrating type electric dust remover

Abstract

The invention discloses a mechanical and pneumatic double rapping type electric dust remover which comprises a cathode system, an anode system, a high-voltage power supply, a shell, a mechanical rapping device and a pneumatic rapping device. When the high-voltage power source is powered on, on one hand, the cathode system and the anode system can be matched to form an electric field, on the other hand, the cathode system can be used for ionizing air, and the cathode system and the anode system can be mechanically rapped and dedusted through mechanical rapping devices arranged on the single sides respectively. The pneumatic rapping device can conduct pneumatic rapping and ash removal on the sides, back to the mechanical rapping device, of the cathode system and the anode system, the dust removal effect is good, the occupied space is small, and the service life is long.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas pollutant treatment, in particular to the technical field of electrostatic precipitator. Background Art

[0002] Electrostatic precipitator is the mainstream equipment for industrial flue gas dust removal. It is widely used in power, steel, cement and chemical industries. It has the advantages of low pressure drop loss, no clogging, large flue gas processing volume and high dust removal efficiency. Electrostatic precipitator usually works together with corona electrode (cathode system) and dust collecting electrode (anode system). Among them, the cathode system can generate corona and ionize the nearby air after power is turned on. The dust particles will collide with negative ions, be charged and form negative particles while the flue gas flows through the corona electrode and the dust collecting electrode. The negatively charged dust particles will move toward the anode plate under the action of the electric field force and gradually adsorb on the anode plate (when the dust particles deposited on the anode plate reach a certain thickness, the vibration mechanism can vibrate the anode plate to make the dust layer fall into the ash hopper), and the purified gas will be discharged from the tail of the electric field at the same time.

[0003] Conventional vibration methods of vibration mechanisms mainly include mechanical vibration and electromagnetic vibration. The electromagnetic vibration method usually requires the arrangement of an electromagnetic vibrator within a space of 2 to 3 m at the top of the inner cavity of the electrostatic precipitator, such as a small-scale high-efficiency tubular electrostatic precipitator with publication number CN108246505A and a top electromagnetic vibration integrated control device with announcement number CN102553383B. This vibration method vibrates the anode plate from the top downward, so the anode plate is not easily effectively cleaned due to the low vibration force on the bottom, and is easily damaged due to the excessive vibration force on the top. At the same time, the electromagnetic vibration method usually has a large number of vibration points, which is prone to local corrosion caused by air leakage and increased flue gas treatment. Similarly, mechanical vibration The beating method also usually arranges the mechanical vibrator on one side of the electric field, and there is a problem of uneven distribution of the vibration force, such as a side mechanical vibration electrostatic precipitator with announcement number CN211865458U and a side vibration electrostatic precipitator with a conductive filter plate with announcement number CN220143684U; in addition, the mechanical vibration method often has the problem that the vibration force cannot be adjusted and the length of the electrostatic precipitator is too long (that is, the electrostatic precipitator occupies too much space) due to the large invalid space in the length direction of the electric field; that is, the existing vibration method cannot adjust the vibration force distribution according to the different dust accumulation characteristics under different working conditions because the vibration point is fixed and can only be arranged on one side and the vibration degree cannot be freely adjusted according to different parts of the anode plate.

[0004] Under the dual carbon background, the co-firing of biomass (sludge) in coal-fired units is the main way to reduce CO2 emissions; however, under the co-firing of biomass, the ratio of fine particles below PM1 in the flue gas dust entering the electrostatic precipitator increases significantly, which leads to a significant increase in the degree of dust accumulation and corrosion of the electrostatic precipitator; in addition, when treating flue gas from burning high-moisture coal, sintering machine head flue gas and papermaking alkali furnace flue gas, due to the characteristics of strong adhesion, large repose angle and light dust, the dust adheres to the anode plate and is not easily vibrated and cleaned. The phenomenon is more obvious; at this time, if ordinary cleaning enhancement measures are adopted (such as increasing the vibration cleaning force and increasing the cleaning frequency), a dust layer cannot be formed during vibration (that is, the dust thickness does not reach a certain value), resulting in the dust that is vibrated down unable to form a block and re-enter the flue gas (that is, secondary dust), ultimately reducing the dust removal efficiency; in addition, under the above circumstances, the cathode line is also very easy to accumulate dust. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the prior art and to propose a mechanical and pneumatic double-vibration type electrostatic precipitator with good dust removal effect, low space occupation and long service life.

[0006] To achieve the above-mentioned purpose, the present invention proposes a mechanical-pneumatic double-vibration type electrostatic precipitator, comprising a cathode system, an anode system, a high-voltage power supply, a casing, a mechanical vibrating device and a pneumatic vibrating device, wherein the cathode system and the anode system are respectively and evenly distributed in the casing, and when the high-voltage power supply is energized, on the one hand, the cathode system and the anode system can cooperate to form an electric field, and on the other hand, the cathode system can be used to ionize the air, and the cathode system and the anode system can be respectively mechanically vibrated and cleaned by a mechanical vibrating device arranged on one side, and the pneumatic vibrating device can pneumatically vibrate and clean the cathode system and the anode system on the side facing away from the mechanical vibrating device.

[0007] Preferably, the pneumatic rapping device includes a pneumatic rapper, a pipeline, a pneumatic solenoid valve and an air source. Every 2 to 10 pneumatic rappers are connected in series through pipelines to form a pneumatic rapping group. Each group of pneumatic rapping groups is individually controlled to open and close by a corresponding pneumatic solenoid valve. The groups of pneumatic rapping groups are connected in parallel through pipelines and connected to an air source.

[0008] Preferably, an integrated filter pressure reducing valve and a stop valve are provided between the air source and each pneumatic rapping group.

[0009] Preferably, the outer shell has a plurality of separation chambers which are arranged in sequence from the air inlet to the air outlet, and the cathode system uses a cathode frame to vertically place the cathode wire in each separation chamber, and the cathode frame has transverse frame rods which are arranged in sequence along the vertical direction, and the cathode wire can be vibrated separately by a mechanical vibrating device and a pneumatic vibrator which are arranged on opposite sides of the transverse frame rod and located at different layers, and the anode system uses an anode vibrating rod to vertically place the anode plate in each separation chamber, and the anode vibrating rod is located at the bottom of the anode plate, and the anode plate can be vibrated separately by a mechanical vibrating device and a pneumatic vibrator which are arranged on opposite sides of the anode vibrating rod.

[0010] Preferably, the transverse frame rods are distributed in 3 to 7 layers in the vertical direction; for the cathode system, a group of mechanical rapping devices is arranged every at least one layer of the transverse frame rods, and no pneumatic rappers are arranged on the transverse frame rods located at the top and bottom layers.

[0011] Preferably, the pneumatic rapper includes a casing, a piston, a spring and an impact head, the piston can slide in the casing along the straight track of the casing, the spring is located in the straight track of the casing and has an elastic tendency to push the piston to approach and close the air inlet, and the air inlet can be pushed away from the piston when air is taken in and indirectly impact the cathode system or the anode system through the impact head.

[0012] Preferably, a permanent magnet is installed in the piston, and an electromagnet is also provided in the housing, which can return the piston to its original position by attracting or repelling the permanent magnet after the piston completes the impact.

[0013] Preferably, the piston is composed of a piston head, a piston rod and an impact block which are connected in sequence. The spring sleeve is arranged outside the piston rod and the impact block and the two ends are respectively fixed to the piston head and the casing. The casing has an air hole connecting the shell straight channel with the outside world, and the air hole is located on the side of the piston head facing away from the air inlet.

[0014] Preferably, a buffer chamber is provided at one end of the shell straight away from the air inlet, a movable wheel is rotatably connected in the buffer chamber, an eccentrically arranged buffer channel is provided on the side of the movable wheel facing the piston, and the pneumatic vibrator can utilize a driving mechanism to drive the movable wheel to rotate so that the buffer channel faces the impact block and allows the impact block to temporarily extend into it.

[0015] Preferably, the driving mechanism comprises a driving gear and a motor. The motor is disposed externally on the surface of the casing and can indirectly drive the movable wheel to rotate via the driving gear meshing with the movable wheel.

[0016] Beneficial effects of the present invention: 1) By installing a mechanical vibration device on one side of the cathode system and the anode system to use the mechanical vibration force for basic dust cleaning, and installing a pneumatic vibration device on the side of the cathode system and the anode system opposite to the mechanical vibration force (for the cathode system, the mechanical vibration device and the pneumatic vibration device need not be on the same layer), the pneumatic vibration device can be used to carry out directional and precise dust cleaning of the parts that could not effectively transmit the mechanical vibration force. On the one hand, the problem of the operating current and voltage of the electrostatic precipitator failing to reach the effective value due to dust accumulation is avoided, and at the same time, the mechanical vibration device is avoided. The phenomenon of component damage or shortened service life due to increased mechanical vibration force is avoided. On the other hand, the length direction space of the electrostatic precipitator can be effectively utilized (the conventional pure mechanical vibration arrangement method requires 1.5 to 2 meters of vibration space, and the composite vibration arrangement method only requires 0.5 to 1 meter of vibration space, the space utilization rate is improved, the amount of steel used for the shell is low, and the site utilization rate is high); 2) By combining a pneumatic vibrator, pipeline, pneumatic solenoid valve, air source, integrated filter pressure reducing valve and stop valve to form a pneumatic vibrating device, the switch of different valves, the pressure of the air source and the vibration interval time logic can be controlled according to the changes in different coal types and load conditions, so as to accurately control the pneumatic vibrating position and pneumatic vibrating force (realizing online real-time adjustment of the cleaning vibration force of the electrostatic precipitator); 3) The main part of the pneumatic vibrator is composed of a casing, a piston, a spring and an impact head, and a permanent magnet and an electromagnet are respectively installed in the piston and the casing, so that the electromagnet can be started to attract or repel the permanent magnet after the piston completes the impact, so that the piston can return to its original position as soon as possible instead of repeatedly impacting the cathode system or the anode system, ensuring that the dust can fall in the best layer, avoiding the generation of secondary dust, and having high dust removal efficiency and good cleaning effect; 4) By installing a movable wheel with an eccentrically arranged buffer channel at one end of the shell straight road away from the air inlet, the driving mechanism can be used to drive the movable wheel to rotate so that on the one hand the buffer channel is directly opposite to the impact block so that the impact block can temporarily extend into and isolate the impact force; on the other hand, the buffer channel and the impact block are staggered so that the impact force can be smoothly transmitted to the outside.

[0017] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a front view of the first embodiment; Figure 2 yes Figure 1 An enlarged schematic diagram of point A; Figure 3 It is a schematic diagram of the assembly of the anode system, the mechanical rapping device and the pneumatic rapping device of the first embodiment; Figure 4Schematic diagram of the air distribution of the pneumatic rapping device of the first embodiment; Figure 5 is a schematic diagram of grouping of the pneumatic rapping device of the first embodiment; Figure 6 is a front view of the pneumatic rapper of the second embodiment; Figure 7 is a schematic diagram of the internal structure of the pneumatic rapper of the second embodiment when not impacting; Figure 8 is a schematic diagram of the internal structure of the pneumatic rapper of the second embodiment when it has impacted; Fig. 9 It is a top view of the movable wheel of the second embodiment.

[0019] In the figure: 1-cathode system, 11-cathode wire, 12-cathode frame, 121-transverse frame rod, 122-longitudinal frame rod, 13-cathode suspension, 2-anode system, 21-anode plate, 22-anode rapping rod, 3-high voltage power supply, 4-housing, 5-mechanical rapping device, 6-pneumatic rapping device, 61-pneumatic rapper, 611-casing, 6111-housing straight track, 6112-air inlet, 6113-air hole, 6114-buffer chamber, 612-piston, 613-spring, 614-impact head, 615-electromagnet, 616-permanent magnet, 617-movable wheel, 6171-buffer channel, 618-driving gear, 619-motor, 62-pipeline, 63-pneumatic solenoid valve, 64-integrated filter pressure reducing valve, 65-stop valve. DETAILED DESCRIPTION

[0020] Embodiment 1: See also Figures 1 to 5 The mechanical and pneumatic double-vibration electrostatic precipitator of the present invention comprises a cathode system 1, an anode system 2, a high-voltage power supply 3, a shell 4, a mechanical vibrating device 5 and a pneumatic vibrating device 6. The cathode system 1 and the anode system 2 are respectively evenly distributed in the shell 4. When the high-voltage power supply 3 is energized, on the one hand, the cathode system 1 and the anode system 2 can cooperate to form an electric field, and on the other hand, the cathode system 1 can be used to ionize air. The cathode system 1 and the anode system 2 can be mechanically vibrated and cleaned by the mechanical vibrating device 5 arranged on one side, and the pneumatic vibrating device 6 can be pneumatically vibrated and cleaned on the side of the cathode system 1 and the anode system 2 facing away from the mechanical vibrating device 5.

[0021] The pneumatic rapping device 6 includes a pneumatic rapper 61, a pipeline 62, a pneumatic solenoid valve 63 and an air source. Every five pneumatic rappers 61 are connected in series through pipelines 62 to form a pneumatic rapping group. Each group of pneumatic rapping groups is individually controlled to open and close by a corresponding pneumatic solenoid valve 63. Each group of pneumatic rapping groups is connected in parallel through pipelines 62 and connected to an air source. The pneumatic solenoid valve 63 is a two-position, three-position normally open valve with ferrules at both ends that can be connected to a metal round tube. The characteristics of the pipeline 62 are as follows: The pipe section in the internal flue gas environment of the electrostatic precipitator is made of 316L or higher stainless steel (needs to meet the corrosion, dust wear and other requirements of the internal flue gas environment of the electrostatic precipitator), and the pipe section in the external environment of the electrostatic precipitator is made of 304 or higher stainless steel (i.e., ordinary instrument pipeline materials that meet the corrosion requirements of the open-air environment); during installation, the anti-drop rope and hook of the pneumatic rapper 61 can be welded on-site at a fixed position on the side of the walkway; in addition, the operating parameters of the pneumatic rapper 61 can refer to the following Table 1:

[0022] Table 1 Pneumatic vibrating hammer reference operating parameters

[0023] An integrated filter pressure reducing valve 64 and a stop valve 65 are also provided between the air source and each pneumatic rapping group.

[0024] The shell 4 has a plurality of separation chambers which are arranged in sequence from the air inlet to the air outlet. The cathode system 1 uses a cathode frame 12 to vertically place the cathode wire 11 in each separation chamber. The cathode frame 12 has transverse frame rods 121 which are arranged in sequence along the vertical direction. The cathode wire 11 can be respectively vibrated by a mechanical rapping device 5 and a pneumatic rapper 61 which are arranged on opposite sides of the transverse frame rod 121 and located on different layers (for the cathode wire 11, the mechanical rapping device 5 and the pneumatic rapper 61 are not arranged on the transverse frame rod 121 located on the same layer). The anode system 2 uses an anode rapping rod 22 to vertically place the anode plate 21 in each separation chamber. The anode rapping rod 22 is located at the bottom of the anode plate 21. The anode plate 21 can be vibrated by a mechanical rapping device 5 and a pneumatic rapper 61 which are arranged on opposite sides of the transverse frame rod 121 and located on different layers. The mechanical rapping devices 5 and the pneumatic rapper 61 on the opposite sides are rapped respectively; in addition, the cathode frame 12 is connected to the outer shell 4 through the cathode hanger 13, and the transverse frame rods 121 of each layer are connected together through the longitudinal frame rods 122; when the viscosity of flue gas dust increases, if only the mechanical rapping device 5 is used to perform conventional mechanical rapping on the cathode wire 11 and the anode plate 21, the cathode wire 11 and the anode plate 21 on the opposite side of the mechanical rapping position are prone to sticky dust and affect the dust removal efficiency; this design of adding a pneumatic rapper 61 to the position of the cathode wire 11 and the anode plate 21 opposite to the mechanical rapping position (that is, the position where the mechanical rapping force on the opposite side is smaller) can effectively improve the cleaning effect on the one hand, and on the other hand, it can also avoid the problem of reduced life of the rapping accessories due to the weight of the mechanical rapping hammer exceeding a certain value.

[0025] The transverse frame rods 121 are distributed in five layers in the vertical direction; for the cathode system 1, a group of mechanical rapping devices 5 are arranged for each layer of the transverse frame rods 121, and no pneumatic rappers 61 are arranged on the transverse frame rods 121 located at the topmost and bottommost layers; specifically, the mechanical rapping devices 5 are arranged at the left ends of the transverse frame rods 121 of the second and fourth layers from top to bottom, and the pneumatic rappers 61 are arranged at the right end of the transverse frame rods 121 of the third layer from top to bottom.

[0026] The working process of this embodiment: When the high-voltage power supply 3 is powered on, the cathode system 1 can discharge and ionize the air through each cathode wire 11, and an electric field will be formed between the cathode system 1 (with negative high voltage) and the anode system 2 (grounded) at the same time (that is, the electric field force is provided by the high-voltage potential difference); when the flue gas flows through the outer shell 4 along the air inlet and the air outlet, most of the dust in it can be adsorbed onto the anode plate 21 under the action of the electric field force after being loaded with negative charges, and a small amount of dust will be adsorbed onto the cathode wire 11 under the action of the electric field force after being loaded with positive charges; during use, workers can use the mechanical vibration device 5 to mechanically vibrate and remove dust on the cathode wire 11 or the anode plate 21, and can use the pneumatic vibration device 6 to pneumatically vibrate and remove dust on the cathode wire 11 or the anode plate 21 (the degree of pneumatic vibration can be adjusted by different jet frequencies and jet pressures according to the dust adhesion conditions of different parts).

[0027] Embodiment 2: See also Figures 6 to 9 The pneumatic rapper 61 includes a housing 611, a piston 612, a spring 613 and an impact head 614. The piston 612 can slide in the housing 611 along the housing straight track 6111. The spring 613 is located in the housing straight track 6111 and has an elastic tendency to push the piston 612 to approach and close the air inlet 6112. The air inlet 6112 can be pushed away from the piston 612 when air is taken in and indirectly impact the cathode system 1 or the anode system 2 through the impact head 614.

[0028] A permanent magnet 616 is installed in the piston 612, and an electromagnet 615 is also installed in the housing 611, which can attract or repel the permanent magnet 616 to restore the piston 612 to its original position after the piston 612 completes the impact.

[0029] The piston 612 is composed of a piston head, a piston rod and an impact block which are connected in sequence. The spring 613 is sleeved outside the piston rod and the impact block and its two ends are respectively fixed to the piston head and the housing 611. The housing 611 has an air hole 6113 connecting the shell straight channel 6111 with the outside world. The air hole 6113 is located on the side of the piston head facing away from the air inlet 6112.

[0030] A buffer chamber 6114 is further provided at one end of the shell straight channel 6111 away from the air inlet 6112, and a movable wheel 617 is rotatably connected to the buffer chamber 6114. An eccentrically arranged buffer channel 6171 is provided on the side of the movable wheel 617 facing the piston 612. The pneumatic vibrator 61 can utilize a driving mechanism to drive the movable wheel 617 to rotate so that the buffer channel 6171 faces the impact block and allows the impact block to temporarily extend into it.

[0031] The driving mechanism includes a driving gear 618 and a motor 619 . The motor 619 is externally disposed on the surface of the housing 611 and can indirectly drive the movable wheel 617 to rotate by the driving gear 618 meshing with the movable wheel 617 .

[0032] The working process of this embodiment: like Figure 7 As shown, when compressed air is not introduced into the pneumatic rapper 61, the piston 612 will be tightly attached to the end of the housing straight channel 6111 close to the air inlet 6112 under the elastic force of the spring 613 (the electromagnet 615 can also be activated to further ensure that the piston 612 is in place); Figure 8 As shown, if the pneumatic solenoid valve 63 is opened and the compressed air is allowed to enter the shell straight channel 6111 along the air inlet 6112, when the pushing force of the compressed air is greater than the elastic force of the spring 613 (or greater than the sum of the elastic force of the spring 613 and the magnetic attraction of the electromagnet 615), the piston 612 can be pushed away from the air inlet 6112 quickly under the push of the compressed air until the impact force is transmitted to the cathode system 1 or the anode system 2 through the impact head 614; wherein, the pneumatic vibration interval time and the pneumatic knocking force can be adjusted by the pneumatic solenoid valve 63 and the air source; when the pneumatic solenoid valve 63 stops energizing, the piston 612 will return to the initial state under the action of the rebound force of the spring 613.

[0033] After each impact is completed, the electromagnet 615 can be started and the permanent magnet 616 can be attracted to further ensure that the piston 612 quickly fits against the housing 611, so as to prevent the piston 612 from repeatedly impacting the cathode system 1 or the anode system 2 due to the back and forth expansion and contraction of the spring 613 (if the cathode line 11 or the anode plate 21 is impacted when the surface dust particles have not reached a certain thickness, the surface dust particles will not be able to be fed in the state of dust layer, which is easy to cause secondary dust); in addition, the motor 619 can be used to drive the driving gear 618 to rotate, thereby driving the movable wheel 617 to rotate until the buffer channel 6171 faces the impact block; at this time, if the piston 612 is still close to the movable wheel 617, the buffer channel 6171 can provide space for the impact block to temporarily enter, so as to prevent the impact force from being transmitted.

[0034] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. Mechanical and pneumatic double vibration type electrostatic precipitator, characterized by: The invention comprises a cathode system (1), an anode system (2), a high-voltage power supply (3), a housing (4), a mechanical vibration device (5) and a pneumatic vibration device (6); the cathode system (1) and the anode system (2) are respectively evenly distributed in the housing (4); when the high-voltage power supply (3) is energized, on the one hand, the cathode system (1) and the anode system (2) can cooperate to form an electric field and on the other hand, the cathode system (1) can be used to ionize air; the cathode system (1) and the anode system (2) can be mechanically vibrated and cleaned by the mechanical vibration device (5) arranged on one side; and the pneumatic vibration device (6) can be pneumatically vibrated and cleaned on the side of the cathode system (1) and the anode system (2) facing away from the mechanical vibration device (5).

2. The mechanical-pneumatic double-rapping electrostatic precipitator according to claim 1, characterized in that: The pneumatic rapping device (6) comprises a pneumatic rapper (61), a pipeline (62), a pneumatic solenoid valve (63) and an air source. Every 2 to 10 pneumatic rappers (61) are connected in series via the pipeline (62) to form a pneumatic rapping group. Each group of pneumatic rapping groups is individually controlled to open and close by a corresponding pneumatic solenoid valve (63). The groups of pneumatic rapping groups are connected in parallel via the pipeline (62) and connected to the air source.

3. The mechanical-pneumatic dual-rapping electrostatic precipitator according to claim 2, characterized in that: An integrated filter pressure reducing valve (64) and a stop valve (65) are also provided between the air source and each pneumatic rapping group.

4. The mechanical-pneumatic dual-rapping electrostatic precipitator according to claim 3, characterized in that: The housing (4) has a plurality of separation chambers arranged in sequence from the air inlet to the air outlet. The cathode system (1) uses a cathode frame (12) to vertically place a cathode line (11) in each separation chamber. The cathode frame (12) has transverse frame rods (121) arranged in sequence along the vertical direction. The cathode line (11) can be vibrated by a mechanical vibrating device (5) and a pneumatic vibrator (61) arranged on opposite sides of the transverse frame rod (121) and located at different layers. The anode system (2) uses an anode vibrating rod (22) to vertically place an anode plate (21) in each separation chamber. The anode vibrating rod (22) is located at the bottom of the anode plate (21). The anode plate (21) can be vibrated by a mechanical vibrating device (5) and a pneumatic vibrator (61) arranged on opposite sides of the anode vibrating rod (22).

5. The mechanical-pneumatic dual-rapping electrostatic precipitator according to claim 4, characterized in that: The transverse frame bars (121) are distributed in 3 to 7 layers in the vertical direction; for the cathode system (1), a set of mechanical rapping devices (5) is arranged every at least one layer of the transverse frame bars (121), and no pneumatic rappers (61) are arranged on the transverse frame bars (121) located at the uppermost and lowermost layers.

6. The mechanical-pneumatic double-rapping type electrostatic precipitator according to any one of claims 2 to 5, characterized in that: The pneumatic rapper (61) comprises a housing (611), a piston (612), a spring (613) and an impact head (614); the piston (612) can slide along a housing straight path (6111) in the housing (611); the spring (613) is located in the housing straight path (6111) and has an elastic tendency to push the piston (612) to approach and close an air inlet (6112); the air inlet (6112) can be pushed away from the piston (612) when air is inhaled and indirectly impact the cathode system (1) or the anode system (2) through the impact head (614).

7. The mechanical-pneumatic dual-rapping electrostatic precipitator according to claim 6, characterized in that: A permanent magnet (616) is installed in the piston (612), and an electromagnet (615) is also provided in the housing (611) for returning the piston (612) to its original position by attracting or repelling the permanent magnet (616) after the piston (612) completes the impact.

8. The mechanical-pneumatic dual-rapping electrostatic precipitator according to claim 6, characterized in that: The piston (612) is composed of a piston head, a piston rod and an impact block which are connected in sequence. The spring (613) is sleeved outside the piston rod and the impact block and its two ends are respectively fixed to the piston head and the housing (611). The housing (611) has an air hole (6113) connecting the housing straight channel (6111) with the outside world. The air hole (6113) is located on the side of the piston head that is away from the air inlet (6112).

9. The mechanical-pneumatic dual-rapping type electric precipitator according to claim 8, characterized in that: A buffer chamber (6114) is further provided at one end of the shell straight channel (6111) away from the air inlet (6112), a movable wheel (617) is rotatably connected to the buffer chamber (6114), an eccentrically arranged buffer channel (6171) is provided on the side of the movable wheel (617) facing the piston (612), and the pneumatic rapper (61) can utilize a driving mechanism to drive the movable wheel (617) to rotate so that the buffer channel (6171) faces the impact block and allows the impact block to temporarily extend into it.

10. The mechanical-pneumatic dual-rapping electrostatic precipitator according to claim 9, characterized in that: The driving mechanism comprises a driving gear (618) and a motor (619); the motor (619) is disposed externally on the surface of the housing (611) and can indirectly drive the movable wheel (617) to rotate via the driving gear (618) meshing with the movable wheel (617).

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