JP6863712B2 - Discharge line and wet electrostatic precipitator using the discharge line - Google Patents

Description

The present invention relates to a discharge line, and more particularly to a discharge line having improved corrosion resistance and a wet electrostatic precipitator using the discharge line.

Wet electrostatic precipitators are used for the purpose of removing fine particles such as dust and mist, including harmful substances such as heavy metals, from large air volume exhaust gas (hereinafter also referred to as dust-containing gas) generated in the production process in factory equipment. It is a device used, and is generally provided in a dust collecting electrode having a smooth surface composed of two flat plates, a cylindrical shape, a square tubular shape, or the like, and a dust collecting electrode. It is composed of an exhaust electrode having a discharge line made of a conductive metal, and makes a great contribution to the prevention of air pollution and environmental measures (for example, Patent Documents 1, 2 and the like).

In addition, the wet electrostatic precipitator has a dust collecting electrode surface when the fine particles such as mist and dust contained in the dust-containing gas are extremely fine and the bulk density is low, or when the intrinsic resistance of the fine particles is too low or too high. A water film is formed on the surface, and the fine particles that reach the dust collecting electrode flow down with this water. Therefore, the wet electrostatic precipitator is widely used because it does not cause the re-scattering phenomenon and the reverse ionization phenomenon and exhibits stable and high dust collecting efficiency.

In a wet electrostatic precipitator, when collecting fine particles, a high voltage is applied between the discharge electrode side and the grounded dust collection electrode side, thereby between the discharge electrode side and the dust collection electrode side. A strong current electric field is formed in. Then, when a corona discharge is generated from the discharge electrode side as the voltage rises, the dust collection space between the discharge electrode and the dust collection electrode is filled with negative ions and electrons. When a dust-containing gas is introduced into such a dust-collecting space from a gas introduction portion, fine particles such as dust and mist in the dust-containing gas are negatively charged, and a dust collecting electrode is generated by Coulomb force with electrostatic coagulation. It moves toward and adheres to the dust collecting electrode. The adhering fine particles lose their negative charge at the dust collecting electrode, are separated from the dust collecting electrode by the washing water supplied to the dust collecting electrode or its own weight, fall off, and are discharged to the outside of the wet electrostatic precipitator. .. In this way, the wet electrostatic precipitator can collect fine particles of various solids and liquids with high dust collection efficiency.

Japanese Unexamined Patent Publication No. 2007-196159 Japanese Unexamined Patent Publication No. 2002-119889

In the wet electrostatic precipitator, in order to generate a corona discharge in the dust collecting space, for example, as shown in FIG. 7, a discharge wire 124 serving as a discharge electrode is suspended in the dust collecting electrode 12. The discharge line 124 continues to be exposed to a dust-containing gas containing sulfuric acid mist, heavy metal, and the like for a long time (always). In particular, fine particles P in the dust-containing gas are likely to adhere to and accumulate on one end of the discharge line 124 in the longitudinal direction (hereinafter, may be referred to as “lower part of the discharge line”) near the gas introduction portion. In the case of a wet electrostatic precipitator, the fine particles adhering to the dust collecting electrode 12 and the discharge line 124 are washed away by the washing water, but in recent years, the supply of the washing water has been increasingly restricted, and even if it is normal. , The cleaning may not reach the lower part of the dust collecting electrode 12 and the discharge line 124 sufficiently.

Corrosion resistance has been conventionally required for the discharge line 124, and various metals are used depending on the properties of the dust-containing gas. However, as described above, if the fine particles P remain deposited on the lower part of the discharge line 124, corrosion such as electrolytic corrosion is likely to occur. As a result, the discharge line 124 is frequently disconnected, and the operation must be stopped for repair, replacement, or the like of the discharge line 124.

The present invention has been proposed in view of such circumstances, and provides a discharge line capable of improving corrosion resistance and extending the service life, and a wet electrostatic precipitator using the discharge line. The purpose is.

The present inventor has made extensive studies to solve the above-mentioned problems. As a result, they have found that by coating a part of the metal wire constituting the discharge wire with a resin, the corrosion resistance can be improved and the occurrence of disconnection or the like can be effectively prevented, and the present invention has been completed.

(1) The first invention of the present invention is a discharge wire constituting a discharge electrode used in a wet electrostatic precipitator, which is made of a metal wire made of a conductive metal and a resin having corrosion resistance. A discharge wire for a wet electrostatic precipitator having a protective member that partially covers and protects the dust collector.

(2) In the second invention of the present invention, in the first invention, the wet electrostatic precipitator includes a gas introduction unit for introducing a gas containing fine particles, and the protective member is the metal wire among the metal wires. A discharge line for a wet electrostatic precipitator that protects one end side in the longitudinal direction near the gas introduction portion.

(3) In the third invention of the present invention, in the first or second invention, the metal wire is made of a material selected from stainless steel, titanium or an alloy thereof, nickel or an alloy thereof, copper or an alloy thereof. This is a discharge wire for a wet electrostatic collector.

(4) In the fourth invention of the present invention, in any one of the first to third inventions, the corrosion-resistant resin is a fluorine-based resin, which is a discharge line for a wet electrostatic precipitator.

(5) In the fifth aspect of the present invention, in any one of the first to fourth inventions, the corrosion-resistant resin is a heat-shrinkable resin, which is a discharge line for a wet electrostatic precipitator.

(6) In the sixth invention of the present invention, fine particles are collected by a gas introduction unit that introduces a gas containing fine particles, a discharge electrode to which a high DC voltage is applied, and a negative corona discharge generated in the vicinity of the discharge electrode. The discharge electrode has a dust collecting electrode for dusting, and the discharge electrode is made of a metal wire made of a conductive metal and a resin having corrosion resistance. A wet electrostatic precipitator having a protective member to protect.

(7) The seventh invention of the present invention is a method for manufacturing a discharge wire constituting a discharge electrode used in a wet electrostatic precipitator, which is made of a resin having corrosion resistance to a metal wire made of a conductive metal. This is a method for manufacturing a discharge wire for a wet electrostatic precipitator, in which a resin tube is inserted and a part of the metal wire is covered with the resin tube to form a protective member.

(8) The eighth invention of the present invention is a method for manufacturing a discharge wire constituting a discharge electrode used in a wet electrostatic precipitator, in which a resin sheet made of a corrosion-resistant resin is formed of a metal wire made of a conductive metal. This is a method for manufacturing a discharge wire for a wet electrostatic precipitator, in which a part of the metal wire is covered with the resin sheet to form a protective member by heating the resin sheet in a state of being wound around the metal wire. ..

(9) The ninth invention of the present invention is the method for manufacturing a discharge wire for a wet electrostatic precipitator in which the gap between the metal wire and the protective member is caulked in the seventh or eighth invention. is there.

According to the present invention, it is possible to provide a discharge line capable of improving corrosion resistance and extending the service life, and a wet electrostatic precipitator using the discharge line.

It is sectional drawing which shows the schematic structure of the wet electrostatic precipitator. It is a perspective view which shows the schematic structure of the inside of the housing of a wet electrostatic precipitator. It is an enlarged perspective view of a main part which shows the schematic structure of a discharge line. It is a schematic diagram which shows the specific example of the shape of a metal wire. It is a figure for demonstrating the manufacturing method of the discharge line which forms a protective member with a resin tube. It is a figure for demonstrating the manufacturing method of the discharge line which forms a protective member with a resin sheet. It is an enlarged perspective view of the main part which shows the schematic structure of the conventional discharge line.

Hereinafter, a specific embodiment of the present invention (hereinafter, referred to as “the present embodiment”) will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments, and various modifications can be made without changing the gist of the present invention.

≪1. Wet electrostatic precipitator ≫
First, the configuration of the wet electrostatic precipitator 1 according to the present embodiment will be described with reference to FIG. FIG. 1 is a cross-sectional view showing a schematic configuration of a wet electrostatic precipitator according to the present embodiment. Specifically, FIGS. 1 (A) and 1 (B) are cross-sectional views showing a schematic configuration of the appearance of the wet electrostatic precipitator, and are cross-sectional views seen from different directions substantially orthogonal to each other.

The wet electrostatic precipitator 1 includes an upper casing 11, a dust collecting electrode 12 that also functions as a side casing, a lower casing 13, a frame 14, a gas introduction section 15, and a cleaning section 16. ..

The housing of the wet electrostatic precipitator 1 is formed by combining the upper casing 11, the dust collecting electrode 12, and the lower casing 13 in that order from above. The housing of the wet electrostatic precipitator 1 is fixed by a frame 14 so as to be separated upward by a predetermined distance from the ground. Gas G1 containing fine particles such as dust and mist is supplied from the gas introduction unit 15 into the wet electrostatic precipitator 1. Further, the cleaning portion 16 is arranged above the upper casing 11 and ejects the cleaning water toward the collecting electrode 12 as a fine mist in a substantially vertical downward direction to clean and remove the fine particles adhering to the collecting electrode. To do. As the material of the housing of the wet electrostatic precipitator 1, a corrosion-resistant metal such as conductive FRP (Fiber Reinforced Plastics) or stainless steel (SUS316L, SUS304, etc.) is adopted in the present embodiment.

FIG. 2 is a perspective view showing a schematic configuration inside the housing of the wet electrostatic precipitator. As shown in FIG. 2, inside the housing of the wet electrostatic precipitator 1, the upper grid 21, the above-mentioned dust collecting electrode 12, the lower grid 22, the electrode rod 23, the discharge line 24, and the weight 25 are provided. Is provided. The upper grid 21, the dust collecting electrode 12, and the lower grid 22 are arranged so as to be substantially parallel to each other in the horizontal direction, separated from each other by a predetermined distance in that order from above. Further, an upward spray nozzle 27 and a cleaning pipe 28 are provided at the upper end of the dust collecting electrode 12 inside the housing of the wet electrostatic precipitator 1.

(1) Configuration of Dust Collection Pole As shown in FIG. 2, the dust collection pole 12 has a square cylinder as a unit (hereinafter, such a unit is referred to as a “room”), and a plurality of “rooms” are repeatedly and continuously repeated. It is composed by arranging. Specifically, for example, the dust collecting electrode 12 is configured by repeatedly and continuously arranging N units in the vertical direction and repeatedly and continuously arranging M units in the horizontal direction. The chamber (dust collecting chamber) in the dust collecting electrode 12 is, for example, a square cylinder having sides having a length of about 35 cm to 50 cm. Of the substantially horizontal directions, one direction is referred to as "vertical direction", and the direction perpendicular to the vertical direction is referred to as "horizontal direction". Further, "N" and "M" are independent arbitrary integer values.

(2) Structure of release electrode The release electrode is composed of an electrode rod 23 and a discharge line 24.

As shown in FIG. 2, the electrode rod 23 is arranged so as to penetrate the inside of the center of a predetermined dust collecting chamber of the dust collecting electrode 12 in a substantially vertical direction, and the upper end portion is fixed to the upper grid 21 and the lower end portion is fixed. Is fixed to the lower grid 22.

As shown in FIG. 2, the discharge line 24 is arranged so that a metal wire 24a is suspended from the upper grid 21 and penetrates the central inside of a predetermined dust collection chamber of the dust collection electrode 12 in a substantially vertical direction. .. Further, the discharge line 24 is connected to a weight 25 provided on the upper part of the lower grid 22 so as to have a tension that does not loosen.

A DC high voltage (charged voltage) of the negative electrode supplied from the power supply device 2 is directly applied to the electrode rod 23. On the other hand, a high DC voltage of the negative electrode is applied to the discharge line 24 via the upper grid 21.

The upward spray nozzle 27 is arranged above the four corners of each dust collection chamber in the dust collection electrode 12, and ejects the cleaning water flowing through the cleaning pipe 28 as a fine mist in a substantially vertical upward direction. This makes it possible to clean and remove fine particles such as mist and dust adhering to the dust collecting electrode 12. In this way, the washing water is ejected from the upward spray nozzle 27 as a fine mist in a substantially vertical upward direction, so that the washing water is well dispersed.

As shown in FIG. 1, the wet electrostatic precipitator 1 has a cleaning unit 16 arranged above the upper casing 11, and in addition to the cleaning water ejected from the upward spray nozzle 27, the dust collecting electrode 12 The fine particles adhering to the above can also be washed with the washing water ejected from the washing unit 16.

(3) Operation of Wet Electrostatic Dust Collector Next, the operation of the wet electrostatic precipitator 1 will be described. In the wet electrostatic precipitator 1, a DC high voltage Vc is applied to the discharge electrode with the dust collecting electrode 12 grounded. As described above, the release electrode is a collection of the electrode rod 23 and the discharge line 24. Then, when the value of the DC high voltage Vc rises, a negative corona discharge is generated between the discharge electrode and each side surface of the dust collection chamber of the dust collection electrode 12 surrounding the discharge electrode, and as a result, the dust is collected from the discharge electrode. Negative ions are transferred in the direction toward each side surface of the dust collecting chamber of the dust electrode 12, and ion wind is generated in the same direction.

As described above, in the wet electrostatic precipitator 1, the internal space of each dust collecting chamber in the dust collecting electrode 12 becomes an ion space. Therefore, as shown in FIG. 1, the gas G1 containing fine particles is supplied to the lower part of the housing of the wet electrostatic precipitator 1 and is from the lower end opening to the upper end opening of each dust collecting chamber of the dust collecting electrode 12. When distributed toward, the fine particles are charged due to the collision of negative ions. The charged fine particles move by receiving a force from the discharge electrode toward each side surface of each dust collecting chamber of the dust collecting electrode 12 by the DC electric field inside each dust collecting chamber of the dust collecting electrode 12, and the charged fine particles move. It adheres to each side of the dust collection chamber. In this way, the fine particles are removed from the gas G1. The gas G2 from which the fine particles have been removed from the gas G1 is discharged from the upper end of each dust collecting chamber of the dust collecting electrode 12, and further, as shown in FIG. 1, from the upper part of the housing of the wet electrostatic precipitator 1. It is discharged.

However, in the conventional wet electrostatic precipitator, as shown in FIG. 7, the fine particles P in the gas G1 introduced from the gas introduction unit 15 are likely to adhere and accumulate at the lower part of the discharge line 124. there were. As described above, in the wet electrostatic precipitator, although the fine particles P adhering to the dust collecting electrode 12 and the discharge line 124 are washed away by the washing water, the washing water is sufficient in the lower part of the dust collecting electrode 12 and the discharge line 124. It may not be perfect. Therefore, in the lower part of the discharge line 124, as shown in FIG. 7, the fine particles P remain deposited for a long time, and corrosion such as electrolytic corrosion is gradually likely to occur.

Therefore, in the present embodiment, the discharge wire arranged in each dust collecting chamber is made of a metal wire made of a conductive metal and a resin having corrosion resistance, and covers the lower portion which is a part of the metal wire. It is characterized in that it has a protective member for protection. Specifically, as will be described later, by forming the lower part of the metal wire as a discharge line protected by a protective member in this way, it is possible to suppress the adhesion and accumulation of the fine particles P, and the corrosion resistance is enhanced, so that the fine particles are formed. Even if P adheres to or accumulates on the lower part of the discharge line, it can be easily removed, and the occurrence of corrosion such as electrolytic corrosion can be effectively prevented.

≪2. Discharge line ≫
Hereinafter, the discharge line will be described in detail. FIG. 3 is a schematic schematic diagram showing the configuration of the discharge line. As shown in FIG. 3, the discharge wire 24 includes a metal wire 24a made of a conductive metal and a protective member 26 made of a resin having corrosion resistance and covering and protecting a lower portion of the metal wire 24a. Has.

[Metal wire]
The metal wire 24a is made of a conductive metal, and a high DC voltage of the negative electrode is applied through the upper grid 21 to generate a corona discharge, and fine particles P contained in the gas G1 adhere to the metal wire 24a.

The metal wire 24a is not particularly limited, but is preferably made of a material selected from stainless steel, titanium or an alloy thereof, nickel or an alloy thereof, and copper or an alloy thereof from the viewpoint of excellent discharge function and corrosion resistance. .. For example, examples of the titanium alloy include a titanium-palladium alloy. Examples of the nickel alloy include Hastelloy (registered trademark) containing nickel as a main component and molybdenum, chromium, iron and the like.

Further, the metal wire 24a may be formed by coating the periphery thereof with a metal having excellent corrosion resistance such as lead. For example, a metal wire 24a made of copper may be used as a core wire, and the periphery of the copper core may be covered with lead.

Note that FIG. 4 is a perspective view showing a specific example of the shape of the metal wire 24a. The cross-sectional shape of the metal wire 24a orthogonal to the longitudinal direction may be round as shown in FIG. 4 (A), square as shown in FIG. 4 (B), or any shape. Good. Further, as shown in FIG. 4C, it may be star-shaped. For example, a metal wire made of a copper core wire is coated with lead having a cross-sectional shape of a star shape having six vertices. You may be.

Further, the metal wire 24a may be provided with a barbed wire-shaped barbed wire so that corona discharge is likely to occur. For example, piercing wires having a diameter of about 3 mm to 10 mm may be installed at predetermined pitch intervals along the longitudinal direction of the metal wire 24a having a diameter of about 1 cm to 10 cm. Specifically, a piercing wire having sharp edges at both ends and bent in an L shape may be welded to the metal wire 24a at the bent portion.

[Protective member]
The protective member 26 is made of a corrosion-resistant resin. Examples of the corrosion-resistant resin include fluororesins, polyolefin resins (polyethylene resins, polypropylene resins, etc.), silicone resins, vinyl chloride resins, and the like, and among them, fluororesins are particularly preferable. Since the fluororesin has a weak adhesive force with the fine particles, it is easy to suppress the accumulation of the fine particles on the protective member 26.

Further, as will be described later, since the metal wire 24a is coated with the resin to form the protective member 26, the heat-shrinkable resin is preferable as the resin having corrosion resistance. By using the heat-shrinkable resin, the gap between the metal wire 24a and the protective member 26 can be reduced by heat treatment, and the metal wire 24a can be brought into close contact with the protective member 26 for protection. As used herein, the term "heat-shrinkable resin" refers to a resin that shrinks when heated and has a high volume density.

Since the metal wire 24a is a discharge electrode for corona discharge, the protective member 26 does not need to be protected more than necessary in the longitudinal direction of the metal wire 24a. In the present embodiment, the protective member 26 is installed in a region above the weight 25 and not facing the dust collecting electrode 12 in the region extending in the longitudinal direction of the metal wire 24a. In this way, by installing the protective member 26 within the range that does not unnecessarily hinder the generation of corona discharge at one end of the discharge line 24 in the longitudinal direction near the gas introduction portion 15, the dust collection function of the discharge line 24 Corrosion resistance can be improved while maintaining the above.

Further, in the wet electrostatic precipitator 1, each of a plurality of dust collecting chambers is provided with a discharge line, but even if all the discharge lines are in the form of a discharge line 24 having a protective member. Some of the discharge lines may be in the form of a discharge line 24 having a protective member. For example, the installation of the discharge line 24 having the protective member 26 may be selected according to the position of the gas introduction unit 15, the air volume, and the wind direction.

≪3. Discharge line manufacturing method ≫
Next, a method of manufacturing the discharge line 24 having the above-described configuration will be described. The discharge wire 24 can be manufactured by covering a part of the metal wire 24a with the protective member 26.

The method of forming the protective member 26 on a part of the metal wire 24a is not particularly limited, but the method of forming the protective member 26 on the metal wire 24a using a resin tube or the method of forming the protective member 26 on the metal wire 24a using a resin sheet is used to protect the metal wire 24a. Examples thereof include methods for forming the member 26, and these methods are preferable because they have good workability and can be easily manufactured.

[Method using resin tube]
Specifically, in the method of forming the protective member 26 using the resin tube, it can be manufactured as shown in FIG. 5, for example. The resin tube serving as the protective member 26 is referred to as "resin tube 26a". That is, a resin tube 26a made of a corrosion-resistant resin is inserted into the metal wire 24a from above, and the resin tube 26a is moved to a position where the lower end thereof abuts on the weight 25. Alternatively, the weight 25 may be removed from the metal wire 24a, and a resin tube 26a made of a corrosion-resistant resin may be inserted into the metal wire 24a from below.

Here, the length of the resin tube 26a in the longitudinal direction is a length that does not interfere with the discharge function of the discharge line 24 and functions as a protective member 26. For example, a metal exposed in a region not facing the dust collecting electrode 12. It may be the length of the wire 24a in the longitudinal direction. Further, the inner diameter of the resin tube 26a is preferably slightly larger than the diameter of the metal wire 24a from the viewpoint of adhesion to the metal wire 24a.

Further, the resin tube 26a is inserted into the metal wire 24a from the viewpoint of preventing fine particles P, washing water, etc. from entering between the metal wire 24a and the resin tube 26a and suppressing corrosion of the metal wire 24a. After moving to a predetermined position, it is preferable to perform a process of closely fixing the outer surface of the metal wire 24a and the resin tube 26a. For example, by using a resin tube 26a made of a heat-shrinkable resin, the resin tube 26a is inserted into the metal wire 24a, and then the resin tube 26a is contracted in the radial direction by heating to make the metal wire 24a and the resin tube 26a shrink. It can be brought into close contact. Further, after the resin tube 26a is inserted into the metal wire 24a (also appropriately heated), if there is a gap between the metal wire 24a and the resin tube 26a, a coding process of filling the gap with a coating agent. May be applied. In particular, when the metal wire 24a has a cross section such as a quadrangular shape or a star shape as shown in FIG. 4, a gap is likely to be formed between the metal wire 24a and the inserted resin tube 26a. As a result, the adhesion can be improved and the corrosion of the metal wire 24a can be further suppressed.

[Method using resin sheet]
Further, in the method of forming the protective member 26 using the resin sheet, for example, it can be manufactured as shown in FIG. The resin sheet serving as the protective member 26 is referred to as "resin sheet 26b". That is, the resin sheet 26b made of a corrosion-resistant resin is rolled so that the inner diameter is substantially equal to or slightly larger than the outer diameter of the metal wire 24a, and the rolled resin sheet 26b is inserted into the metal wire 24a. , The resin sheet 26b is wound around the metal wire 24a, and then the resin sheet 26b is moved to a position where the lower end thereof abuts on the weight 25. Then, the end of winding of the resin sheet 26b is welded by heating the resin sheet 26b.

Here, the width of the resin sheet 26b (the length in the longitudinal direction of the metal wire 24a) is a length that does not interfere with the discharge function of the discharge wire 24 and functions as a protective member 26. It may be the length in the longitudinal direction of the metal wire 24a exposed in the non-opposing region.

Further, from the viewpoint of suppressing corrosion of the metal wire 24a, it is preferable that the outer surface of the metal wire 24a and the resin sheet 26b are sufficiently brought into close contact with each other. For example, by using a heat-shrinkable resin as the resin sheet 26b, the resin sheet 26b is wound around the metal wire 24a, and then heated to shrink the resin sheet 26b in the radial direction to make the metal wire 24a and the resin sheet 26b It may be brought into close contact. Further, after the resin sheet 26b is wound around the metal wire 24a and heated, if there is a gap between the metal wire 24a and the resin sheet 26b, a coding process of filling the gap with a coating agent may be performed. As described above, particularly when the metal wire 24a has a quadrangular or star-shaped cross section, a gap is likely to be formed between the metal wire 24a and the inserted resin tube 26a. It is possible to improve the adhesion and further suppress the corrosion of the metal wire 24a.

In the form shown in FIGS. 5 and 6, an example is shown in which the metal wire 24a to which the weight 25 is attached is covered with the resin tube 26a or the resin sheet 26b to form the protective member 26, but the weight 25 is attached. The protective member 26 may be formed by covering the metal wire 24a before the metal wire 24a with the resin tube 26a or the resin sheet 26b. Further, the timing of covering the resin tube 26a or the resin sheet 26b may be after or before the discharge line 24 is installed in the housing of the wet electrostatic precipitator 1.

1 Wet electrostatic precipitator 2 DC high voltage input unit 3 DC high voltage generator 11 Upper casing 12 Dust collector 13 Lower casing 14 Frame 15 Gas introduction unit 16 Cleaning unit 21 Upper grid 22 Lower grid 23 Electrode rod 24 Discharge wire 24a Metal wire 25 Weight 26 Protective member 26a Resin tube 26b Resin sheet 27 Upward spray nozzle 28 Cleaning piping

Claims (7)

A method for manufacturing a discharge wire that constitutes a discharge electrode used in a wet electrostatic precipitator.
By heating the resin sheet in a state where a resin sheet made of a corrosion-resistant resin is wound around a metal wire made of a conductive metal, a part of the metal wire is covered with the resin sheet to protect the protective member. Including forming
The metal wire around which the resin sheet is wound has a quadrangular or star-shaped cross section, and has piercing lines at predetermined intervals in the longitudinal direction of the metal wire.
A method for manufacturing a discharge wire for a wet electrostatic precipitator. The wet electrostatic precipitator is provided with a gas inlet for introducing a gas containing fine particles,
The method for manufacturing a discharge wire for a wet electrostatic precipitator according to claim 1, wherein the resin sheet is wound around a portion of the metal wire on the one end side in the longitudinal direction near the gas introduction portion to form the protective member. .. The method for manufacturing a discharge wire for a wet electrostatic collector according to claim 1 or 2, wherein the metal wire is made of a material selected from stainless steel, titanium or an alloy thereof, nickel or an alloy thereof, copper or an alloy thereof. .. The method for manufacturing a discharge line for a wet electrostatic precipitator according to any one of claims 1 to 3, wherein the resin having corrosion resistance is a fluororesin. The method for manufacturing a discharge line for a wet electrostatic precipitator according to any one of claims 1 to 4, wherein the resin having corrosion resistance is a heat-shrinkable resin. A weight is attached to the lower end of the metal wire.
The resin sheet is wound around a part of the metal wire with the weight attached to form the protective member.
The method for manufacturing a discharge line for a wet electrostatic precipitator according to any one of claims 1 to 5. The method for manufacturing a discharge wire for a wet electrostatic precipitator according to any one of claims 1 to 6, wherein the gap between the metal wire and the protective member is caulked.

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