KR101066018B1 - Electrostatic precipitator with structure for insulating and fixing electrode rod - Google Patents

Abstract

The present invention relates to an electrostatic precipitator that collects and charges by supplying cations or negative ions through discharge to fine particles contained in exhaust gases discharged from incinerators, thermal power plants and automobiles. Insulation breakdown is prevented by injecting air that insulation is destroyed by contamination dust between the flow path and the flow path into which the exhaust gas flows, and has an electrode insulation fixing structure that can prevent breakage of electrode and deterioration of discharge efficiency due to high temperature. do.

The electrostatic precipitator equipped with the electrode insulation fixing structure of the present invention is to induce a discharge by applying a high voltage to generate a large amount of cations or anions, and to collect and collect the fine particles in the exhaust gas by using the generated ions As an apparatus, an electrode rod having a cooling hole for supplying cooling air or cooling gas is installed perpendicular to the flow of exhaust gas, and one end of the electrode rod is insulated and fixed with an insulating material having a first slit for injecting air. It is fixed to one side of the flow path tube by the device, and the other end is fixed to an insulating fixture provided with a second slit for injection of cooling air or gas supplied to the cooling hole.

The insulation fixing device has a plurality of first slits formed in a concentric shape centering on an electrode rod and injecting air, wherein one of the plurality of first slits has an inner circumferential surface of a through hole through which the electrode is penetrated and an outer circumferential surface of the electrode rod. It is formed between and made to inject air.

The insulating fixture is formed of an insulating material, the end of the electrode is inserted into a fixed insertion hole is formed, the cooling insert is supplied to the cooling hole of the electrode between the electrode and the fixed insertion hole is inserted into the fixed insertion hole and the end is fixed A second slit through which air or cooling gas is injected is formed.

Automotive, Exhaust Gas, Electrostatic Precipitator, Discharge, Insulation, Electricity, Cooling

Description

Electrostatic precipitator with structure for insulating and fixing electrode rod}

The present invention is charged by supplying positive or negative ions through the discharge to charge the fine particles (polluted dust) in order to increase the dust collection efficiency of the fine particles (contamination dust) contained in the exhaust gas discharged from incinerators, thermal power plants, automobiles, etc. It relates to an electrostatic precipitator.

In general, an electrostatic precipitator receives a combustion gas containing particulate pollution such as dust emitted from a coal-fired power plant, incinerator, automobile, etc., and forms an electric field with an electrode (discharge electrode) by using a high voltage. If it has a basic structure to collect and remove the combustion gas containing charged dust and polluted dust in the charged electrode having a polarity opposite to that of the electrode rod (discharge electrode), it is introduced into the electrostatic precipitator after combustion. And an electrode rod (discharge electrode) for energizing the particles flowing into the duct for inducing combustion gas (dust-containing), a high voltage generator, a dust collector for collecting charged particles, and the like.

Brief description of the electrostatic precipitator used in thermal power plants, incinerators and automobiles as the prior art of the present invention, receiving the combustion gas containing the dust as shown in Figs. A flow path 1 for collecting is basically provided, and one side of the flow path 1 is formed with an inlet for receiving a gas containing a large amount of particulate dust. The other side of the inlet is formed with an outlet for discharging the gas from which the particulate dust is removed to the outside in the opposite direction of the inlet, the electrode (2) electrically connected to the high voltage applying device (4) on one side of the flow path (1) ) Is installed to maintain insulation from the flow path (1) by the insulating fixing device (3), the electrode (2) is formed so that a plurality of discharge pins (2a) is located inside the flow path (1), the flow path ( 1) is grounded (ground) so as to have the opposite polarity to the electrode 2, and a dust collecting plate for collecting polluted dust charged inside the flow path 1 or behind the flow path 1 is installed.

Such an electrostatic precipitator must maintain an insulating state between the flow path 1 and the electrode 2 so that a normal corona discharge occurs when a high voltage is applied to the electrode 2.

However, when using the insulating fixing device 3 of the insulating material in which the electrode 2 is installed at the center of one side of the flow path 1 as shown in FIG. Attached to the electrode 2 and the insulating fixing device 3, the insulation is broken by the contaminated dust (fine particles), so that abnormal corona discharge occurs as shown in the graph shown in FIG. .

In order to solve this disadvantage, as shown in Figure 2 to form a concave inlet (3a) in the insulating fixing device 3 to prevent contamination of dust (fine particles) attached to break the insulation.

However, in recent years, oxyhydrogen power plants and automobiles, which are widely used, recycle some of the exhaust (exhaust) gas such as flue gas reformer (FGR) and exhaust gas reformer (EGR) to increase combustion efficiency and reduce harmful emissions. In the system, the concentration of contaminated dust (fine particles, dust) in the discharged gas is very high, and the exhaust gas temperature is also considerably higher than that of conventional combustion, and insulation maintenance by the indentation part 3a formed in the insulation fixing device 3 is prevented. The disadvantage is that it is not well maintained.

In addition, when back pressure occurs, a large amount of contaminated dust flows into the concave portion 3a, and the contaminated dust is attached to the concave portion 3a as shown in FIG. 2 to destroy the insulation state.

In addition, since the temperature of the exhaust gas is high, deformation occurs due to the high temperature and the flow of the exhaust (discharge) gas into which the electrode (discharge) rod is introduced, and there is a problem in that normal corona discharge does not occur by the electrode rod heated to a high temperature.

In order to solve the problems of the prior art as described above, an object of the present invention is to maintain the insulation between the flow path and the electrode even in the exhaust gas with a high concentration of contaminated dust (fine particles, dust, etc.) to generate a normal corona discharge, Fixing or supporting both ends of the electrode to prevent deformation caused by the flow of high temperature and exhaust gas, and to provide an electrostatic precipitator to solve the deformation and instability of the corona discharge by cooling the electrode.

Electrostatic precipitator equipped with an electrode rod insulation fixing structure of the present invention for solving the above problems is installed vertically with respect to the flow direction of the exhaust gas, the cooling hole 24 is provided inside the cooling air or cooling gas supplied therein The electrode 20; An insulation fixing device (30) of an insulating material having one end of the electrode rod (20) fixed to one side of the flow path tube (10) and having at least one first slit for injecting air; And an insulating fixture having a second slit for fixing the other end of the electrode rod 20 and for injecting cooling air or gas discharged from the cooling hole 24 of the electrode rod toward the electrode rod 20. 50);

The electrode rod is provided with a cooling hole for supplying cooling air or cooling gas, one end is fixed to the insulating fixing device of the insulating material provided with a first slit for injecting air installed on one side of the flow path, the other end to the cooling hole It is characterized in that it is fixed to the insulating fixture provided with a second slit to be supplied cooling air or gas.

The insulation fixing device includes a plurality of first slits formed in a concentric shape centering on an electrode rod to inject air, and one of the plurality of first slits includes an inner circumferential surface of the through hole and an electrode rod through which the electrode is penetrated. It is formed between the outer peripheral surface is characterized in that for injecting air.

The insulation fixing device may include a fixing hole in which an electrode rod penetrates at an upper portion thereof, a circular insertion hole communicating with the fixing hole and concentric with the fixing hole, and an air supply hole communicating with the insertion hole to supply air. It includes, and the cylindrical body of the insulating material is fixed to one side of the flow path; Is inserted into the insertion hole of the body, consisting of a cylindrical insert member of the insulating material formed through-holes through which the electrode rod, a third slit is formed between the inner peripheral surface of the insertion hole and the outer peripheral surface of the insertion member, The fourth slit is formed between the inner circumferential surface and the outer circumferential surface of the electrode.

The insertion hole of the body is formed deeper than the length of the insertion member is formed in the recess.

The air supply hole formed in the cylindrical body is composed of one or a plurality of first air supply holes supplied to the side of the insertion hole, and a second air supply hole supplied to the upper surface of the insertion hole, the insertion hole is It has a first inner diameter equal to the diameter of the insertion member and a second inner diameter larger than the diameter of the insertion member, an expansion pipe hole having a diameter larger than the through hole is formed on the insertion member, the expansion hole is supplied with a second air supply Communicate with the hall.

The outer circumferential surface of the insertion member is formed with a groove interlocking with the first air supply hole.

The gap θ of the first slit or the second slit is formed to be 1 to 3 mm.

The electrode rod includes an insulating layer of an insulating material.

The insulating fixture is formed of an insulating material, the end of the electrode is inserted into a fixed insertion hole is fixed, the cooling is supplied to the cooling hole of the electrode between the electrode and the fixed insertion hole is inserted into the fixed insertion hole and the end is fixed Characterized in that the second slit through which the air or cooling gas is injected is formed.

The fixing insertion hole of the insulating fixture is formed larger than the diameter of the electrode rod so that the second slit is formed, the fixing insertion hole is provided with a fixture for fixing the end of the electrode rod, the discharge end is formed in the end portion of the electrode rod Consist of,

The electrode bar is fixed to the fixing insertion hole of the insulating fixture, the cooling air or the cooling gas supplied to the cooling hole of the electrode is discharged through the discharge hole is characterized in that the injection is maintained through the second slit to maintain insulation.

In the electrostatic precipitator provided with the electrode rod insulation fixing structure of the present invention made as described above, and fixed to the electrode rod with an insulation fixing device so that the insulation is maintained on one side of the flow path, the other end of the electrode rod is fixed with an insulating fixture, the insulation fixing Slits of several millimeters are formed in the device so that air at the speed of sound is ejected (sprayed) even with a small amount of air supply, thereby preventing dust from accumulating around the electrode to maintain insulation, and the slit in the insulating fixture It is formed by spraying the cooling air supplied for cooling the electrode to maintain the insulation.

That is, the electrode insulation fixing structure of the electrostatic precipitator of the present invention, the air is injected through a plurality of slits formed in the insulation fixing device for fixing one end (top) of the electrode rod and the insulating fixture for fixing the other end (lower) By removing the contaminated dust (fine particles, dust) accumulated on the surface and removing the contaminated dust (fine particles, dust) accumulated on the inner circumferential surface of the recess through the slit formed in the insulation fixing device, to prevent the destruction of the insulation state by the contaminated dust This can be maintained reliably.

In addition, by using the cooling air supplied for cooling the electrode at the same time for cooling and insulation can be used more efficiently, by preventing overheating of the electrode can solve the deformation and instability of the corona discharge.

In addition, it is possible to prevent deformation such as bending of the electrode due to the high temperature and the flow rate of the exhaust gas is made of a structure for fixing both ends of the electrode.

By providing reliable electrode insulation fixing structure like this, Flue Gas Reciculatioin (FGR) and EGR (Exhaust) are used to increase combustion efficiency and reduce harmful emissions in pure oxygen power plants and automobiles with high concentration of pollutant dust (fine particles, dust). It can be used reliably in a system that recycles and burns some of the exhaust gas, such as Gas Reciculatioin, and can solve the problem of deterioration of dust collection efficiency due to breakdown of insulation.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

As shown in FIGS. 3 and 4, the electrostatic precipitator includes a flow path tube 10 through which discharge (exhaust) gas is introduced, an electrode rod 20 installed at one side of the flow path tube 10, and the flow path tube 10. Insulation between the electrode 20 and the electrode 20 is fixed to one end of the electrode 20 (upper view) fixed to one side of the flow path tube 10 and the high voltage applied to the electrode 20 It consists of a high voltage application device 40, and an insulating fixture 50 for fixing the other end (lower in the drawing) of the electrode 20 to maintain the insulated state with the flow path tube 10, as shown in FIG. The plurality of channels may be installed in the flow path tube 10, and the electrode rods 20 are fixed by the insulating fixing device 30 and the insulating fixing device 50, respectively.

The flow path tube 10 is formed with an inlet and outlet for the discharge gas is introduced into one side, the connecting means is formed at both ends. The connecting means is usually connected to the duct or discharge pipe in which the exhaust gas is moved by a fastening means such as a bolt 11 is formed.

The flow path tube 10 is connected to the ground electrode of the high voltage application device 40, as shown in the accompanying drawings and has the opposite polarity with the electrode 20.

Inside the flow path tube 10, a plurality of dust collecting plates having opposite polarity (that is, opposite polarity to charged contamination dust) are collected from the electrode rod 20 that collects the contaminated dust (fine particles, branches) charged through corona discharge. It can be installed to collect the charged dust, or to allow the inner surface of the flow path pipe 10 to serve as a dust collecting plate, the lower side of the flow path pipe 10 can be formed a collecting portion for collecting the collected fine particles. . However, a dust collector is usually provided at the rear of the flow path tube 10 so that charged polluted dust is introduced therein and a plurality of dust collectors having opposite polarities to the charged polluted dust are installed.

One end (upper part in the drawing) of the electrode 20 is fixed to the fixture 22 of the insulating fixing device 30 as shown in FIGS. 3 to 4, and the other end (lower part in the drawing) is fixed to the insulating fixture 50. It is installed perpendicular to the moving direction of the exhaust gas.

The electrode 20 is electrically connected to the high voltage applying device 40, and has a plurality of discharge pins 21, as shown in Figure 14, formed in a hollow tube cooling hole 24 is supplied with cooling air or cooling gas ) And one or a plurality of discharge holes 25 through which cooling air or cooling gas supplied to the cooling holes 24 is discharged.

The discharge hole 25 is formed to be positioned in the fixed insertion hole 51 of the insulating fastener 50 to be installed as shown in FIG. 13 so that the cooling air or the cooling gas discharged through the discharge hole 25 is the second slit. It is ejected through 52.

Electrode 20 made in this way is subjected to a high voltage from the high voltage application device 40 generates a corona discharge to generate a large amount of cations or anions to contaminate the dust in the exhaust gas flowing into the inlet of the flow path (10) (fine particles, Dust, etc.).

In order to insulate the electrode 20, the insulating layers 23 and 23 ′ of an insulating material may be formed on the outer circumferential surfaces of the upper and lower portions as illustrated in FIGS. 11 and 14, and the insulating layers 23 and 23 ′ may be ceramics. Is formed.

Cooling air is supplied to the cooling hole 24 formed in the electrode 20 to cool the electrode 20 so that the electrode 20 can be used even in a high temperature exhaust gas, and prevents a decrease in discharge efficiency due to high temperature.

As the cooling air supplied to the cooling hole 24 formed in the electrode 20 is injected through the second slit 52 formed in the insulating fastener 50, as shown in FIG. 13, the electrode 20 is insulated from the electrode 20. The fixture 50 is kept insulated.

The insulation fixing device 30 is to fix the electrode (20) to one end (upper view) to maintain the insulation to the flow pipe 10 as shown in Figures 3 to 5, the flow pipe as shown in Figures 6 and 7 It is fixed to (10), the body of the cylindrical shape of the insulating material on which the electrode rod 20 is installed, and is installed inside the body 31, at least one first slit (34, 35) and It is composed of an insertion member 32 which is an insulating material for forming the concave portion 33, the body 31 and the insertion member 32 is usually formed of a synthetic resin material.

The upper part of the body 31 is formed with a screw hole formed in the inner side and the fixing hole 31d through which the electrode rod 20 is penetrated, and is in communication with the fixing hole 31d and concentric with the fixing hole 31d. A circular insertion hole 31c is formed, and a first air supply hole 31a or a second air supply hole 31b connected to the insertion hole 31c and connected to an air supply pipe for supplying air is formed at a side surface thereof. Is formed.

The first air supply hole 31a may be formed in the form of a plurality of radiations at the same height on the outer circumferential surface of the body 31 and communicated to supply air to the third slits 34 to be rearranged.

The second air supply hole 31b communicates to supply air to the fourth slit 35 by supplying air to the upper portion of the insertion member 32 to be rearranged.

The insertion hole 31c has a first inner diameter portion 31c ′ equal to the diameter of the insertion member 32 and a second inner diameter portion 31c ″ larger than the diameter of the insertion member 32.

The insertion member 32 is inserted into and fixed to the insertion hole 31c of the body 31, and is formed to form a recess 33 in the lower side as shown in FIG.

The insertion member 32 is formed in a cylindrical shape, and a through hole 32a through which the electrode rod 20 is installed is formed on the center line as shown in FIG. 6, and a through hole 32a is formed on the through hole 32a. The expansion hole 32b with a larger (half) diameter is formed. The expansion hole 32b communicates with the second air supply hole 31b so that air introduced into the second air supply hole 31b is uniformly supplied to the fourth slit 35 through the expansion hole 32b. do.

In addition, a groove 32c is formed around the outer circumferential surface of the insertion member 32 as shown in FIG. 8, and the groove 32c is interlocked with the first air supply hole 31a. The air supplied through the first air supply hole 31a is uniformly supplied to the third slit 34 through the groove 32c.

The insertion member 32 formed as described above is inserted into the insertion hole 31c of the body 31 as shown in FIGS. 7 and 11 and the second inner diameter portion 31c ″ and the insertion member 32 formed in the insertion hole 31c. The third slit 34 is formed by the gap θ formed between the outer surfaces of the c), and is formed between the through hole 32a and the outer circumferential surface of the electrode rod 20 inserted into the through hole 32a. The fourth slit 35 is formed by (θ).

As shown in FIG. 12, the air supplied to the first air supply hole 31a is injected at a speed close to the speed of sound, and the air injected to the third slit 34 is inserted into the insertion hole 31c. Removes dirt accumulated on the inner circumferential surface of the

The fourth slit 35 supplies the air supplied to the second air supply hole 31b uniformly through the expansion hole 32b, and sprays at a speed close to the speed of sound, and sprays the fourth slit 35. The air to be removed removes the dirt accumulated on the outer peripheral surface of the electrode 20.

The gap θ of the first slits 34 and 35 is generally formed to have a size of 1 to 3 mm, and the air injected through the first slits 34 and 35 has a speed of sound or a speed close to that of the sound.

The insulating fixture 50 is formed of an insulating material to fix the end (lower in the drawing) of the electrode rod 20 to be insulated from the flow path tube 10, and the end portion of the electrode rod 20 is inserted as shown in FIG. 13. The fixing insertion hole 51 is fixed, and the fixing insertion hole 51 is formed with a fixing tool 53 for fixing the end of the electrode rod 20.

A second slit formed by forming a gap between the inner circumferential surface of the fixed insertion hole 51 and the outer circumferential surface of the electrode rod 20 to inject and discharge the cooling air or cooling gas supplied through the cooling hole 24 of the electrode rod 20 ( 52) is formed. That is, the size of the (half) diameter of the fixed insertion hole 51 is larger than the diameter of the electrode rod 20 to form a gap between the inner circumferential surface of the fixed insertion hole 51 and the outer circumferential surface of the electrode rod 20 to form a second slit. 52 is formed.

A gap of the second slit 52 is usually formed in a size of 1 to 3 mm, and the air injected through the second slit 52 has a speed of sound or a speed close to that of the sound.

The electrode rod 20 is installed to be perpendicular to the flow of the discharge (exhaust) gas so that both ends thereof are maintained in the flow path pipe 10 by the insulating fixing device 30 and the insulating fixing device 50 formed as described above.

As shown in FIG. 12, air supplied to the first air supply hole 31a by the insulation fixing device 30 is injected through the third slit 34 to remove the dirt that accumulates on the inner circumferential surface of the insertion hole 31c. Air supplied to the second air supply hole 31b is sprayed through the fourth slit 35 to remove contaminants accumulated on the outer circumferential surface of the electrode rod 20, and the flow path is formed by the gap between the first slits 34 and 35. It is possible to maintain reliable insulation between the tube 10 and the electrode 20.

As shown in FIG. 13, cooling air supplied to the cooling hole 24 of the electrode 20 by the insulating fixture 50 is sprayed through the second slit 52 to remove contaminants accumulated on the outer circumferential surface of the electrode 20. In addition, the clearance between the flow path tube 10 and the electrode rod 20 can be maintained by the gap between the second slits 52.

In this way, the electrode rod 20 is fixed to both ends by the insulation fixing device 30 and the insulating fixture 50 so that insulation is maintained in the flow path tube 10, and is supplied through the cooling hole 24 of the electrode rod 20. By preventing the electrode 20 from being heated by the cooling air, it is possible to prevent deformation such as warpage of the electrode 20 due to the flow of high temperature and exhaust gas, to improve the instability of the corona discharge due to the high temperature, and to contaminate dust concentration. In addition, it is possible to induce reliable corona discharge by preventing energization due to pollution dust even in rich exhaust gas.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications can be made within the scope of the technical idea of the present invention, and it is obvious that the present invention belongs to the appended claims. Do.

1 is a cross-sectional view of a conventional electrostatic precipitator.

Figure 2 is a cross-sectional view of an electrostatic precipitator showing another conventional embodiment.

3 is a cross-sectional view of an electrostatic precipitator showing an embodiment of the present invention.

Figure 4 is a side cross-sectional view of the electrostatic precipitator showing an embodiment of the present invention shown in FIG.

5 is a cross-sectional view of an electrostatic precipitator showing another embodiment of the present invention.

6 is an exploded cross-sectional view of an insulation fixing device using air of the present invention electrostatic precipitator.

Figure 7 is a cross-sectional view of the insulation fixing device using the air of the present invention electrostatic precipitator.

8 is a cross-sectional view of the insulation fixing device using air showing another embodiment of the present invention.

9 is a bottom view of the insulating fixture shown in FIG.

10 is a cross-sectional view taken along the line A-A of the insulation fixing device shown in FIG.

Figure 11 is a detailed cross-sectional view of the slit portion of the insulation fixing device of the present invention.

12 is a cross-sectional view of an operating state of the insulation fixing device of the present invention.

13 is a cross-sectional view of an insulating fixture showing an embodiment of the present invention.

14 is a front view of an electrode showing an embodiment of the present invention.

15 is a graph of corona discharge between an applied voltage and a discharge current, where A is a normal corona discharge graph in an insulated state, and B is a corona discharge graph in an energized state.

* Description of the symbols for the main parts of the drawings *

1, 10: Euro 2, 20: electrode

3, 30: insulation fixing device 4, 40: high voltage application device

50: insulation fixture 1a, 11: flange

2a, 21: discharge pin 22: fixture

23: insulating layer 24: cooling hole

31 body 31a: first air supply hole 31b: second air supply hole

31c: insertion hole 31d: fixing hole

32: insertion member 32a: through hole

32b: Expansion hole 32c: Groove

33: recessed part 34: third slit 35: fourth slit 52: second slit

Claims (11)

In an electrostatic precipitator which induces discharge by applying a high voltage to generate a large amount of cations or anions, and charges and collects the fine particles in the exhaust gas by using the generated cations or anions, An electrode rod 20 installed vertically with respect to the flow direction of the exhaust gas and having a cooling hole 24 provided therein for supplying cooling air or cooling gas; An insulation fixing device (30) of an insulating material having one end of the electrode rod (20) fixed to one side of the flow path tube (10) and having at least one first slit for injecting air; And Insulating fixture 50 having a second slit for fixing the other end of the electrode rod 20 and injecting cooling air or gas discharged from the cooling hole 24 of the electrode rod toward the electrode rod 20. ); Electrostatic precipitator comprising a. The method of claim 1, The insulation fixing device 30 has a through hole 32a through which the electrode rod 20 is installed, and the first slit is disposed between an inner circumferential surface of the through hole 32a and an outer circumferential surface of the electrode rod 20. Electrostatic precipitator, characterized in that the spraying the air. The method of claim 1, In the insulation fixing device (30), the first slit, the electrostatic precipitator, characterized in that formed in plural concentric circles centering on the electrode rod (20) to inject air. The method according to any one of claims 1 to 3, The insulation fixing device 30, 31 d of fixing holes through which the electrode rod 20 penetrates, a circular insertion hole 31 c communicating with the fixing hole 31 d and concentric with the fixing hole 31 d, and the insertion hole 31 c. A cylindrical body 31 including an air supply hole communicating with the air supply hole for supplying air, the insulating material being fixed to one side of the flow path tube 10; And A cylindrical insert member 32 inserted into the insertion hole 31c of the body 31 and formed of an insulating material having a through hole 32a through which the electrode rod 20 penetrates; Including; The first slit is Third slit 34 formed between the inner circumferential surface of the insertion hole 31c and the outer circumferential surface of the insertion member 32 and the fourth slit 35 formed between the inner circumferential surface of the through hole 32a and the outer circumferential surface of the electrode rod 20. Electrostatic precipitator comprising a. 5. The method of claim 4, The insertion hole (31c) of the body 31 is formed deeper than the length of the insertion member 32, the electrostatic precipitator, characterized in that the concave inlet portion (33) is formed. 5. The method of claim 4, The air supply hole formed in the cylindrical body 31 has one or more first air supply holes 31a which are supplied to the side of the insertion hole 31c and the upper surface of the insertion hole 31c. It is made of a second air supply hole (31b) to be supplied, The insertion hole 31c has a first inner diameter portion 31c 'equal to the diameter of the insertion member 32 and a second inner diameter portion 31c ″ larger than the diameter of the insertion member 32, An expansion pipe hole 32b having a diameter larger than that of the through hole 32a is formed at an upper portion of the insertion member 32, and the expansion hole 32b communicates with the second air supply hole 31b. Dust collector. The method of claim 6, An electrostatic precipitator, characterized in that a groove (32c) is formed on the outer circumferential surface of the chant insertion member (32) is interlocked with the first air supply hole (31a). The method according to claim 1 or 2, Electrostatic precipitator, characterized in that the clearance (θ) of the first slit or the second slit is 1 ~ 3mm. The method according to claim 1 or 2, The electrode rod 20 is an electrostatic precipitator, characterized in that it comprises an insulating layer (23) of insulating material. The method according to claim 1 or 2, The insulating fixture 50 is formed of an insulating material, the end of the electrode rod 20 is formed with a fixed insertion hole 51 is fixed, the end is inserted into the fixed insertion hole 51 is fixed The second slit 52 is formed between the electrode rod 20 and the fixed insertion hole 51 to inject the cooling air or gas supplied through the cooling hole 24 of the electrode rod 20. Electrostatic precipitator characterized in that. The method of claim 10, The fixing insertion hole 51 of the insulating fixture 50 is formed larger than the diameter of the electrode rod 20 so that the second slit 52 is formed, and the fixing insertion hole 51 of the electrode insert 20 Fixing means 53 for fixing the end is provided, the discharge end 25 is formed in the end of the electrode rod 20, In the fixing insertion hole 51 of the insulating fixture 50, the electrode rod 20 is fixed by the fixture 53, and the cooling air supplied to the cooling hole 24 of the electrode rod 20. Alternatively, the gas is discharged to the discharge hole (25) is injected through the second slit (52), the electrostatic precipitator, characterized in that to maintain insulation.

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