An electrostatic precipitator

Abstract

The present invention discloses an electrostatic precipitator, which comprises an inner cylinder, an outer cylinder, a corona electrode, a dust collecting electrode and a rotary assembly; the inner cylinder includes an inner top cover, an inner insulating cylinder and an inner conical cylinder which are connected in sequence from top to bottom, and the outer cylinder includes an outer top cover, an outer insulating cylinder and an outer conical cylinder which are connected in sequence from top to bottom; the dust collecting electrode is in a cylindrical shape, and the corona electrode includes a barbed wire installation cylinder and barbed wires fixed on the outer wall of the barbed wire installation cylinder; the inner insulating cylinder, the barbed wire installation cylinder, the dust collecting electrode and the outer insulating cylinder are vertically arranged and coaxially fixed and sleeved in sequence from inside to outside; an annular electrostatic dust removal chamber is formed between the outer cylinder and the inner cylinder, and a cyclone dust removal chamber is formed inside the inner cylinder; the rotary assembly is rotatably arranged in the electrostatic dust removal chamber, and the rotary assembly includes an upper annular plate, a lower annular plate and a plurality of helical blades in a group. The plurality of helical blades are made of insulating materials. It continuously scrapes ash under the push of the tail gas to be treated through the rotary assembly in the electrostatic dust removal chamber, the ash cleaning is timely and effective, and the dust removal effect is good.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental protection equipment, and particularly relates to an electrostatic precipitator. Background Art

[0002] After the spray drying of ceramic raw materials, a large amount of dust-containing gas will be formed, which needs to be dust-removed before being discharged. Currently, it is generally dust-removed by an electrostatic precipitator. In addition, it has a wide range of applications in many other fields, such as boiler dust removal and chemical dust removal fields.

[0003] The working principle of an electrostatic precipitator is to use a high-voltage electric field to ionize the flue gas, and the dust in the air flow is charged and separated from the air flow under the action of the electric field. The negative electrode is made of metal wires with different cross-sectional shapes, called the discharge electrode or corona electrode. The positive electrode is made of metal plates with different geometric shapes, called the dust collection electrode, and its structure is usually a metal plate suspended in parallel.

[0004] The dust accumulated on the dust collection electrode needs to be removed in time. Otherwise, the corona discharge will weaken, the dust cannot carry enough charges after entering the electric field, and the dust removal efficiency will be greatly reduced. When the dust on the dust collection electrode accumulates to a certain thickness, the ionization effect will gradually lose its effect. Therefore, the electrode ash removal must be treated timely and effectively.

[0005] Electrostatic precipitators are divided into two categories: dry and wet according to different ways of removing the dust accumulated on the dust collection electrode. The dry electrostatic precipitator removes the dust accumulated on the dust collection electrode by intermittently exciting multiple vibrators at the top and side, which will cause certain damage to the equipment and reduce the service life of the equipment; while the wet electrostatic precipitator forms a water film on the dust collection electrode through a spraying device to remove the dust. In a humid and charged environment, it will cause equipment corrosion and dew condensation and creeping discharge. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an electrostatic precipitator that can clean the dust collection electrode timely and effectively and improve the dust removal effect.

[0007] The technical solution adopted by the present invention to solve the technical problem is: an electrostatic precipitator, which includes an inner cylinder, an outer cylinder, a corona electrode, a dust collection electrode, and a rotary assembly;

[0008] Among them, the inner cylinder includes an inner top cover, an inner insulating cylinder, and an inner conical cylinder connected in sequence from top to bottom. The outer cylinder includes an outer top cover, an outer insulating cylinder, and an outer conical cylinder connected in sequence from top to bottom. The dust collection electrode is cylindrical. The corona electrode includes a barbed wire installation cylinder and barbed wires fixed on the outer wall of the barbed wire installation cylinder, and barbs are provided on the barbed wires. The inner insulating cylinder, the barbed wire installation cylinder, the dust collection electrode, and the outer insulating cylinder are vertically arranged and coaxially fixed and sleeved from inside to outside in sequence. An annular electrostatic dust removal chamber is formed between the outer cylinder and the inner cylinder, and a cyclone dust removal chamber is formed inside the inner cylinder;

[0009] The rotary assembly is rotatably arranged in the electrostatic dust removal chamber. The rotary assembly includes an upper annular plate, a lower annular plate and a plurality of helical blades in a group. The plurality of helical blades are made of insulating materials, and the helical direction of the helical blades is right-handed; the upper ends of the helical blades are fixed on the upper annular plate, and the lower ends are fixed on the lower annular plate. A plurality of air distribution holes are formed in the upper annular plate, and a plurality of fan-shaped ash leakage ports are formed in the lower annular plate. The upper annular plate and the lower annular plate are facing each other up and down, and the axis is coaxially arranged with the inner insulating cylinder. There is a movement gap between the outer rotary contour line of the helical blade and the inner wall of the dust collecting electrode, and the spike is located inside the inner rotary contour line of the helical blade;

[0010] An air inlet is formed at the upper end of the outer top cover. The upper end of the inner top cover is communicated with the lower end of an air outlet pipe, and the upper end of the air outlet pipe passes upward through the air inlet; the conical bottom of the outer conical cylinder is arranged downward and a dust outlet is formed at the conical bottom; the inner conical cylinder is fixed on the inner conical cylinder and is provided with a plurality of tangential air inlets, and the tangential air inlets blow air tangentially in the counterclockwise direction; the bottom of the inner conical cylinder is connected with an ash discharge pipe, and the ash discharge pipe passes downward through the dust outlet; a first air lock and feeding device is arranged at the lower end of the ash discharge pipe, and a second air lock and feeding device is arranged at the lower end of the dust outlet.

[0011] Preferably, the inner conical cylinder includes a conical cylinder body, the conical bottom of the cylinder body is arranged downward, the upper end of the cylinder body is communicated with the lower end of the inner insulating cylinder, the tangential air inlets are arranged on the cylinder wall of the cylinder body, and the cylinder wall of the cylinder body is fixed on the outer conical cylinder through a plurality of support legs, and the ash discharge pipe is connected with the bottom of the cylinder body.

[0012] Preferably, the distance between the spike and the inner rotary contour line of the helical blade is 3-5 cm.

[0013] Preferably, the upper annular plate is rotatably supported on the upper insulating ring, and the lower annular plate is rotatably supported on the lower insulating ring.

[0014] Preferably, the lower end of the inner insulating cylinder is connected with the upper end of the inner conical cylinder through a lower insulating ring, and the upper end of the inner insulating cylinder is connected with the lower end of the inner top cover through an upper insulating ring.

[0015] Preferably, the electrostatic precipitator further includes a positioning member. The positioning member includes an inner ring, an outer ring and connecting spokes fixedly connecting the outer ring and the inner ring; the inner ring is sleeved on the inner top cover in a matching manner, the outer ring is sleeved on the connecting cylinder, the outer top cover is fixedly connected with the upper end of the outer insulating cylinder through the connecting cylinder, and the lower end of the outer top cover presses the outer ring downward and fixes it on the upper end of the connecting cylinder; a positioning flange is formed on the outer wall of the inner top cover, and the lower end of the inner ring presses downward against the positioning flange;

[0016] Preferably, the lower end of the inner insulating cylinder and the lower end of the spike wire installation cylinder are both inserted and embedded in the lower insulating ring, and the upper end of the inner insulating cylinder and the upper end of the spike wire installation cylinder are both inserted and embedded in the upper insulating ring.

[0017] Preferably, the blade angle of the helical blade is set to 30° to 45°.

[0018] Preferably, a plurality of ash leakage openings and a plurality of helical blades are arranged at intervals on the lower annular plate, and the circumferential end of each ash leakage opening along the counterclockwise direction extends to the lower end of the adjacent helical blade on the corresponding side.

[0019] The present invention has the following advantages: By forming a cyclone dust removal chamber and an annular electrostatic dust removal chamber through the inner and outer cylinder structures, continuous ash scraping is carried out in the electrostatic dust removal chamber under the push of the tail gas to be treated by the rotary assembly, the ash cleaning is timely and effective, and the dust removal effect is good. Compared with the vibration ash removal method in dry dust removal, it avoids damage to the equipment, improves the ash removal efficiency, and at the same time, continuous ash scraping greatly reduces the ash accumulation on the dust collecting plate; compared with the water film ash cleaning in wet dust removal, it is not easy to cause equipment corrosion and dew condensation and creepage. At the same time, by carrying out cyclone dust removal in the inner cylinder, the dust in the tail gas is further reduced, and the structure is relatively compact. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of an electrostatic precipitator according to a preferred embodiment of the present invention;

[0021] Figure 2 is a schematic structural diagram of a rotary assembly according to a preferred embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of a lower cone cylinder according to a preferred embodiment of the present invention;

[0023] Figure 4 is a schematic diagram of a partial structure according to a preferred embodiment of the present invention;

[0024] Description of the Reference Numerals:

[0025] 11. Outer insulating cylinder; 12. Connecting cylinder; 13. Outer top cover;

[0026] 14. Outer cone cylinder; 140. Second air lock and blanking device; 2. Inner insulating cylinder;

[0027] 3. Rotary assembly; 31. Lower annular plate; 31a. Ash leakage opening;

[0028] 32. Upper annular plate; 32a. Air distribution hole; 33. Helical blade;

[0029] 4. Dust collecting electrode 4; 5a. Upper insulating ring; 5b. Lower insulating ring;

[0030] 6. Inner cone cylinder; 61. Cylinder body; 62. Tangential air inlet;

[0031] 63. Support leg; 64. Ash discharge pipe; 7. Positioning member;

[0032] 71. Outer ring; 72. Connecting spoke; 73. Inner ring;

[0033] 8. Corona electrode; 81. Thorn wire installation cylinder; 82. Thorn wire;

[0034] 9. Inner top cover; 9a. Air outlet pipe; 91. Positioning flange;

[0035] 1S. Electrostatic dust removal chamber; 2S. Cyclone dust removal chamber; 13a. Air inlet;

[0036] 14a. Dust outlet; 641. Housing; 642. Flap;

[0037] 643. Spring; Detailed implementation mode

[0038] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0040] The present invention will be further described below with reference to the accompanying drawings.

[0041] Please refer to Figures 1 to 4 .

[0042] The electrostatic precipitator of this embodiment includes an inner cylinder, an outer cylinder, a corona electrode 8, and a dust collecting electrode 4. The inner cylinder includes an inner top cover 9, an inner insulating cylinder 2, and an inner conical cylinder 6 that are sequentially connected from top to bottom; the outer cylinder includes an outer top cover 13, an outer insulating cylinder 11, and an outer conical cylinder 14 that are sequentially connected from top to bottom. An air inlet 13a is provided at the upper end of the outer top cover 13, the upper end of the inner top cover 9 is communicated with the lower end of an air outlet pipe 9a, and the upper end of the air outlet pipe 9a passes upward through the air inlet 13a. The conical bottom of the outer conical cylinder 14 is arranged downward and a dust outlet 14a is provided at the conical bottom.

[0043] The corona electrode 8 includes a barbed wire installation cylinder 81 and barbed wires 82 fixed on the outer wall of the barbed wire installation cylinder 81. Barbs are provided on the barbed wires 82, and the barbs of the barbed wires 82 are arranged radially outward in the horizontal plane. The dust collecting electrode 4 is cylindrical. The inner insulating cylinder 2, the barbed wire installation cylinder 81, the dust collecting electrode 4, and the outer insulating cylinder 11 are vertically arranged and coaxially fixed and sleeved from the inside to the outside in sequence. An annular electrostatic dust removal chamber 1S is formed between the outer cylinder and the inner cylinder, and a cyclone dust removal chamber 2S is formed inside the inner cylinder.

[0044] The electrostatic precipitator of this embodiment further includes a rotary assembly 3 rotatably arranged in the electrostatic dust removal chamber 1S. The rotary assembly 3 includes an upper annular plate 32, a lower annular plate 31, and a group of four spiral blades 33 in total. The four spiral blades 33 are made of insulating materials. The spiral direction of the spiral blades 33 is right-handed. The upper ends of the spiral blades 33 are fixed on the upper annular plate 32, and the lower ends are fixed on the lower annular plate 31. A plurality of air distribution holes 32a are provided on the upper annular plate 32, and four fan-shaped ash leakage ports 31a are provided on the lower annular plate. The upper annular plate 32 and the lower annular plate 31 are vertically opposed and axially coaxial with the inner insulating cylinder 2. A movement gap of 0 - 3 mm is left between the outer rotary contour line of the spiral blades 33 and the inner wall of the dust collecting electrode 4. The barbs are located inside the inner rotary contour line of the spiral blades 33 to avoid interference, and the distance between the barbs and the inner rotary contour line of the spiral blades 33 is preferably 2 - 5 cm.

[0045] After the tail gas to be treated enters the electrostatic dust removal chamber 1S downward from the air inlet, under the pressure drive of the tail gas, the rotary assembly rotates counterclockwise (viewed from top to bottom), and then the tail gas forms a counterclockwise cyclone in the electrostatic dust removal chamber, increasing the residence time in the electrostatic dust removal chamber; at the same time, the outer edge of the spiral blades 33 continuously scrapes the dust on the inner wall of the dust collecting electrode 4. To avoid damaging the dust collecting electrode during dust scraping, the blade angle (also called the twist angle) of the spiral blades 33 is set to 30° - 45°. The four ash leakage ports 31a and the four spiral blades 33 are arranged at intervals on the lower annular plate 31, and one circumferential end of each ash leakage port 31a along the counterclockwise direction extends to the lower end of the adjacent spiral blade 33 on the corresponding side to prevent ash accumulation at the lower end of the spiral blades 33.

[0046] In some other embodiments, the number of the spiral blades 33 and the ash leakage openings 31a may also be other numbers, such as 2, 3 or more than 4.

[0047] Wherein, the lower end of the inner insulating cylinder 2 is connected to the upper end of the inner conical cylinder 9 through a lower insulating ring 5b, and the upper end of the inner insulating cylinder 2 is connected to the lower end of the inner top cover 9 through an upper insulating ring 5a. Preferably, the lower end of the inner insulating cylinder 2 is inserted into a first annular groove (not marked) formed in the lower insulating ring 5b, and the upper end of the inner insulating cylinder 2 is inserted into a second annular groove (not marked) formed in the upper insulating ring 5a. Similarly, the lower end of the spike wire mounting cylinder 81 is inserted into a third annular groove (not marked) formed in the lower insulating ring 5b, and the upper end of the spike wire mounting cylinder 81 is inserted into the second annular groove (not marked) formed in the upper insulating ring 5a. In this way, the installation and disassembly of the inner insulating cylinder 2 and the spike wire mounting cylinder 81 can be facilitated.

[0048] Wherein, the upper annular plate 32 is rotatably connected to the upper insulating ring 5a through a spherical roller bearing 34. A ring platform is formed on the upper insulating ring 5a, and the upper annular plate 32 is also rotatably supported on the ring platform through a thrust cylindrical roller bearing 35. The lower annular plate 31 is rotatably connected to the lower insulating ring 5b through another spherical roller bearing. A ring platform is formed on the lower insulating ring 5b, and the lower annular plate 32 is also rotatably supported on the ring platform provided on the lower insulating ring 5b through another thrust cylindrical roller bearing.

[0049] The inner conical cylinder 6 includes a conical cylinder body 61 with the conical bottom facing downward. The upper end of the cylinder body 61 is communicated with the lower end of the inner insulating cylinder 2, and a plurality of tangential air inlets 62 for tangential air intake are provided on the cylinder wall of the cylinder body 61. The cylinder wall of the cylinder body 61 is fixed to the outer conical cylinder 14 through a plurality of support legs 63. An installation flange is formed at the upper end of the outer conical cylinder 14, and the installation flange is fixedly installed on an installation base (not shown). A dust outlet pipe 64 is connected to the bottom of the cylinder body 61, and the dust outlet pipe 64 passes downward through the dust outlet 14a. A first air lock and blanking device 640 is provided at the lower end of the dust outlet pipe 64, and a second air lock and blanking device 140 is provided at the lower end of the dust outlet 14a. Among them, the air lock and blanking device is used to avoid air leakage during normal operation while blanking, and its structure is the prior art.

[0050] For example, the first airtight feeding device 640 may include a housing 641 and a horizontal flap 642 hinged inside the housing 641. The flap 642 is connected to the housing 641 by a spring 643. Under the action of the spring 643, the flap 642 can be reset to the airtight position; when the accumulated ash weight on the flap 642 exceeds a certain value, the flap 642 rotates to the discharging position to form a discharging gap for discharging. After discharging, it is reset under the action of the spring 643 to re-seal the air. The opening and closing of the flap 642 is rectangular, and the housing 641 is a rectangular housing. The upper end of the housing 641 communicates with the lower end of the ash discharge pipe 64, and the lower end is provided with an opening. The structure of the second airtight feeding device 140 is similar to that of the first airtight feeding device 640. The difference is that the upper end of the housing of the second airtight feeding device 140 communicates with the lower end of the dust outlet 14a.

[0051] Among them, the tangential air inlet 62 intakes air tangentially on one side in the counterclockwise direction (when viewed from top to bottom) (as Figure 3 indicated by the arrow in the figure). In this way, part of the air flow in the electrostatic dust removal chamber 1S intakes air tangentially from the tangential air inlet 62 and exits from the air outlet pipe 9a at the upper end, forming a rotating upward air flow in the cyclone dust removal chamber 2S, which can further perform cyclone dust removal. The dust accumulated at the bottom of the cyclone dust removal chamber 2S can be discharged through the ash discharge pipe 64. The dust accumulated at the bottom of the electrostatic dust removal chamber 1S is discharged through the dust outlet 14a.

[0052] In some other embodiments, preferably, to assist in positioning the inner cylinder and reduce the vibration of the inner cylinder, the electrostatic precipitator further includes a positioning member 7. The positioning member 7 includes an inner ring 73, an outer ring 71, and connecting spokes 72 fixedly connecting the outer ring 71 and the inner ring 73. The inner ring 73 is sleeved on the inner top cover 9 in a mating manner, the outer ring 71 is sleeved on a connecting cylinder 12, and the outer top cover 13 is fixedly connected to the upper end of the outer insulating cylinder 11 through the connecting cylinder 12. The lower end of the outer top cover 13 presses downwards to tightly fix the outer ring 71 at the upper end of the connecting cylinder 12. A positioning flange 91 is formed on the outer wall of the inner top cover 9, and the lower end of the inner ring 73 presses downwards against the positioning flange 91.

[0053] In some other embodiments, preferably, to prevent the exhaust gas pressure from being insufficient to drive the rotary assembly 3, a booster fan can be provided at the front end of the air inlet 13a.

[0054] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

[0055] Other parts not detailed in the present invention belong to the prior art, so they will not be elaborated here.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electrostatic precipitator, characterized in that, it includes an inner cylinder, an outer cylinder, a corona electrode, a dust collecting electrode, and a rotary assembly; Among them, the inner cylinder includes an inner top cover, an inner insulating cylinder, and an inner conical cylinder connected in sequence from top to bottom. The outer cylinder includes an outer top cover, an outer insulating cylinder, and an outer conical cylinder connected in sequence from top to bottom. The dust collecting electrode is cylindrical. The corona electrode includes a barbed wire installation cylinder and barbed wires fixed on the outer wall of the barbed wire installation cylinder. Barbs are provided on the barbed wires. The inner insulating cylinder, the barbed wire installation cylinder, the dust collecting electrode, and the outer insulating cylinder are vertically arranged and coaxially fixed and sleeved from inside to outside in sequence. An annular electrostatic precipitation chamber is formed between the outer cylinder and the inner cylinder, and a cyclone dust removal chamber is formed inside the inner cylinder; The rotary assembly is rotatably arranged in the electrostatic precipitation chamber. The rotary assembly includes an upper annular plate, a lower annular plate, and a plurality of spiral blades in a group. The plurality of spiral blades are made of insulating materials, and the spiral direction of the spiral blades is right-handed. The upper ends of the spiral blades are fixed on the upper annular plate, and the lower ends are fixed on the lower annular plate. A plurality of air equalizing holes are opened on the upper annular plate, and a plurality of fan-shaped ash leakage ports are opened on the lower annular plate. The upper annular plate and the lower annular plate are vertically opposed and axially coaxial with the inner insulating cylinder. There is a movement gap between the outer rotary contour line of the spiral blades and the inner wall of the dust collecting electrode, and the barbs are located inside the inner rotary contour line of the spiral blades; An air inlet is opened at the upper end of the outer top cover. The upper end of the inner top cover is communicated with the lower end of an air outlet pipe. The upper end of the air outlet pipe passes upward through the air inlet. The conical bottom of the outer conical cylinder is arranged downward and a dust outlet is opened at the conical bottom. The inner conical cylinder is fixed with a plurality of tangential air inlets on it, and the tangential air inlets are tangentially introduced air in the counterclockwise direction. The bottom of the inner conical cylinder is connected with an ash discharge pipe, and the ash discharge pipe passes downward through the dust outlet. A first air lock and feeding device is provided at the lower end of the ash discharge pipe, and a second air lock and feeding device is provided at the lower end of the dust outlet; Among them, the plurality of ash leakage ports and the plurality of spiral blades are arranged at intervals on the lower annular plate, and the circumferential end of each ash leakage port along the counterclockwise direction extends to the lower end of the adjacent spiral blade on the corresponding side.

2. The electrostatic precipitator according to claim 1, characterized in that, the inner conical cylinder includes a conical cylinder body, the conical bottom of the cylinder body is arranged downward, the upper end of the cylinder body is communicated with the lower end of the inner insulating cylinder, the tangential air inlets are arranged on the cylinder wall of the cylinder body, the cylinder wall of the cylinder body is fixed on the outer conical cylinder through a plurality of support legs, and the ash discharge pipe is connected to the bottom of the cylinder body.

3. The electrostatic precipitator according to claim 1, characterized in that, the distance between the barbs and the inner rotary contour line of the spiral blades is 3 - 5 cm.

4. The electrostatic precipitator according to claim 1, characterized in that, the upper annular plate is rotatably supported on an upper insulating ring provided, and the lower annular plate is rotatably supported on a lower insulating ring provided.

5. The electrostatic precipitator according to claim 1, characterized in that, the lower end of the inner insulating cylinder is connected to the upper end of the inner conical cylinder through a lower insulating ring, and the upper end of the inner insulating cylinder is connected to the lower end of the inner top cover through an upper insulating ring.

6. The electrostatic precipitator according to claim 1, characterized in that, The electrostatic precipitator further includes a positioning member, which includes an inner ring, an outer ring, and connecting spokes fixedly connecting the outer ring and the inner ring; the inner ring is sleeved on the inner top cover in a mating manner, the outer ring is sleeved on the connecting cylinder, the outer top cover is fixedly connected to the upper end of the outer insulating cylinder through the connecting cylinder, and the lower end of the outer top cover presses the outer ring downward and fixes it to the upper end of the connecting cylinder; a positioning flange is formed on the outer wall of the inner top cover, and the lower end of the inner ring presses downward against the positioning flange; 7. The electrostatic precipitator according to claim 6, characterized in that, the lower ends of the inner insulating cylinder and the barbed wire installation cylinder are both inserted into the lower insulating ring, and the upper ends of the inner insulating cylinder and the barbed wire installation cylinder are both inserted into the upper insulating ring.

8. The electrostatic precipitator according to claim 1, characterized in that, the blade angle of the spiral blade is set to 30° to 45°.

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