JP2002210385A - Discharge electrode of wet electric dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve dust collection performance by preventing loosing of an electrode support part caused by corrosion of spacers. SOLUTION: A discharge electrode 8 of a wet electric dust collector has a plurality of discharge plates 10 each having a hole 10a in the center and a plurality of sharp-pointed projections 10b radially arranged on the periphery, and a plurality of cylindrical spacers 11A for holding the discharge plates 10 at regular vertical intervals, where a core rod 9 penetrates the holes 10a of the discharge plates 10 and the hollow parts of the spacers 11A to connect them vertically and continuously. The spacer 11A is made of a resin, and an energizing spring 21 is set in the hollow part of the spacer so as to surround the core rod 9 and press against the lower surface of the upper discharge plate 10 and the upper surface of the lower discharge plate 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge electrode for a wet type electrostatic precipitator, and more particularly to a discharge type electrode for a wet type electric precipitator for removing dust and mist contained in combustion exhaust gas from a boiler.

[0002]

2. Description of the Related Art An electrostatic precipitator generates corona discharge by a high DC voltage, charges particles in a gas, and separates the charged particles from the gas by an electric force in an electric field to collect dust. The electric precipitator includes a dry electric precipitator that removes dust accumulated on a dust collecting electrode by a slashing device, and a wet electric precipitator that flows down the dust collecting electrode with water.

[0003] The electric precipitator is used, for example, incorporated in a part of a flue gas desulfurization plant or the like. Dry electrostatic precipitator in flue gas desulfurization plant is used to remove large amounts of dust in front of the absorption tower, the wet electrostatic precipitator is used to remove SO ₃ mist or fine dust after the absorption tower.

FIG. 2 is a side view of a wet electric dust collector. FIG. 3 is a view taken in the direction of arrows AA in FIG. FIG. 4 is a partially enlarged view of FIG. FIG. 5 is a partially enlarged view of FIG. 2 to 5, reference numeral 1 denotes a wet electric precipitator. Reference numeral 2 denotes a mount for the wet electric dust collector 1. Numeral 3 denotes a vertically long box-shaped container which houses a plurality of discharge electrodes 8 and dust collecting electrodes 12 described later, and is erected on the gantry 2. 3a is a hopper at the bottom of the box-shaped container 3,
At the lower end, a drain discharge pipe 3b for discharging drain drained off by the washing water is provided. Reference numeral 4 denotes an exhaust gas introduction pipe provided in the middle of the box-shaped container 3, and reference numeral 4a denotes an exhaust gas introduction port.
Reference numeral 5 denotes a clean gas discharge pipe provided on the opposite side of the exhaust gas introduction pipe 4, and reference numeral 5a denotes a clean gas discharge port. Reference numeral 6 denotes a frame for suspending the dust collection electrode 12. Reference numeral 7 denotes a power supply material. Reference numeral 9 denotes a core rod of the discharge electrode 8. Reference numeral 10 denotes a plurality of discharge plates described later. Numeral 11 denotes a plurality of cylindrical spacers for keeping the distance between the upper and lower discharge plates 10 constant. Reference numeral 13 denotes a plurality of support frame frames for supporting the dust collection electrode 12, which are formed in a honeycomb shape by connecting a plurality of stainless steel flat plates in a hexagonal shape. A plurality of round bars are suspended between the upper and lower support frame frames 13 to form the dust collection electrode 12. 14 is an insulator. Fifteen
Reference numerals 16 denote cleaning water supply pipes for cleaning dust accumulated on the dust collecting electrode 12. 17 is an exhaust gas and 18 is a clean gas. Reference numeral 19 denotes an inlet gas distribution plate provided in the exhaust gas introduction pipe 4. Reference numeral 22 denotes a high-voltage power supply for supplying power to the discharge electrode 8.
23 is a water seal device.

As shown in FIG. 5, the discharge electrode 8 has a plurality of stainless dish-shaped discharge plates 10 each having a hole 10a at the center and a plurality of projections 10b having a sharp tip on the outer periphery.
A plurality of cylindrical spacers 11 made of stainless steel for keeping the upper and lower intervals of each discharge plate 10 constant;
And a stainless steel core rod 9 which penetrates through the hollow portion of the spacer 11 and is continuously connected up and down. Each of the discharge plates 10 and the spacers 11 are vertically tightened by nuts 9a screwed to the upper and lower ends of the core rod 9 (FIG. 4).

As shown in FIG. 4, the dust collecting electrode 12 is formed of a plurality of round bars 12a, and upper and lower ends thereof are respectively connected to a supporting frame frame 13 formed in a honeycomb shape. As shown in FIG. Note that the dust collection electrode 12 may be a flat plate instead of a round bar, and the support frame 13 may be a quadrangle, an octagon, or a circle instead of a hexagon.

When the high-voltage power supply 22 is connected to the discharge electrode 8 and the voltage is gradually increased to 40 KV to 60 KV, a corona discharge occurs between the discharge electrode 8 and the dust collecting electrode 12. When the exhaust gas 17 passes through the corona discharge, the particles in the exhaust gas 17 are charged, and the charged particles and the gas are separated by an electric force in an electric field and collected on the dust collecting electrode 12.

The dust accumulated on the dust collecting electrode 12 is washed down by the sprinkling water supplied from the washing water supply pipes 15 and 16, and is discharged from the drain outlet 3b at the lower end of the hopper 3a of the box-shaped container 3.

[0009]

In the discharge electrode of the above wet type electrostatic precipitator, the spacer is used as a main current path. However, since the spacer is exposed to corrosive gas, it is necessary to use a high corrosion resistant stainless steel, which is expensive. Not only that, since the properties vary from plant to plant, a great deal of effort is required to select corrosion resistant materials. Also, if the length is reduced by corrosion of the spacer,
Looseness occurs in the upper and lower electrode support portions, thereby deteriorating the electrical conductivity and deteriorating the dust collection performance.

The present invention has been made in order to solve the above-described problems. The main energizing path is formed by an energizing spring, and the energizing spring is surrounded by a resin spacer to remove corrosive gas. An object of the present invention is to provide a discharge electrode of a wet electric precipitator capable of protecting and preventing the electrode support portion from being loosened due to corrosion of a spacer and improving dust collection performance.

[0011]

According to the electrode of the wet type electrostatic precipitator of the present invention, a plurality of discharge plates having a hole at the center and a plurality of projections having a sharp tip on the outer periphery are radially provided, and Of a wet-type electrostatic precipitator having a plurality of cylindrical spacers for keeping the upper and lower intervals constant, and having a core rod penetrating through the hole of each discharge plate and the hollow portion of the spacer to be continuously connected vertically. In the electrode, the spacer is made of a resin, and is provided with a spring for energization so as to surround a core rod in a hollow portion thereof and press against a lower surface of an upper discharge plate and an upper surface of a lower discharge plate. is there.

It is preferable to mount an annular sealant in contact with the upper and lower ends of the spacer and the upper and lower surfaces of the discharge plate.

It is preferable that the energizing spring is made of metal such as stainless steel and is a coil spring or a disc spring.

Further, the sealing material is preferably made of rubber.

Next, the operation of the present invention will be described. Since the main energizing path is made to be an energizing spring and is constantly pressed between the discharge plates, it is possible to prevent the electrode support from being loosened. In addition, since the spacer is made of resin, it has high corrosion resistance even when exposed to corrosive gas, and furthermore, an annular sealing material is provided between the upper and lower ends of each spacer and each discharge plate. It is possible to prevent the corrosive gas from entering the gas.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partially enlarged view of the discharge electrode of the wet type electrostatic precipitator of the present invention. The same parts as those of the discharge electrode of the wet type electrostatic precipitator shown in FIGS. 2 to 5 are denoted by the same reference numerals, and the description thereof will be omitted.
In FIG. 1, reference numeral 8 denotes a discharge electrode. The discharge electrode 8 has a hole 10a at the center, and a plurality of protrusions 10b with sharp tips on the outer periphery.
And a plurality of cylindrical spacers 11A made of resin for keeping the upper and lower intervals of each discharge plate 10 constant, and the holes 10a of each discharge plate 10 and the hollows of the spacers 11A are provided. The core bar 9 is formed by being vertically stacked by penetrating the core bar 9, and the upper and lower ends of the core bar 9 are fastened by nuts 9 a. 20 is a discharge plate 10 at the upper and lower ends of the spacer 11A.
Is a ring-shaped rubber sealing material that comes into contact with the upper surface or the lower surface. Reference numeral 21 denotes a stainless steel energizing spring interposed so as to surround the core rod 9 in the hollow portion of the spacer 11A, and constantly presses between the discharge plates 10.

Next, the operation based on the embodiment will be described. Since the main energizing path is set to the energizing spring 21 and is constantly pressed between the respective discharge plates 10, it is possible to prevent the electrode supporting portion from being loosened. Further, since the spacer 11A is made of resin, the spacer 11A has high corrosion resistance even when exposed to corrosive gas. Further, the annular seal member 20 is provided between the upper and lower ends of each spacer 11A and each discharge plate 10. Therefore, it is possible to prevent the corrosive gas from entering the spacer 11A.

FIG. 6 is a partially enlarged view of the discharge electrode of the wet type electrostatic precipitator according to the third aspect of the present invention. In the figure, the discharge electrode 8 of the wet type electrostatic precipitator is a stainless steel disc spring 21A as a spring for energizing the discharge type electrode 8 of the wet type electric precipitator described in FIG.
Is used. The disc spring 21A is interposed in the hollow portion of the spacer 11 so as to surround the core rod 9, and always presses between the discharge plates 10. The other parts are the same as those of the discharge electrode 8 of the wet electrostatic precipitator described in FIG.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention. For example, a cylindrical container may be used instead of the box-shaped container of the wet-type electrostatic precipitator.

[0020]

According to the discharge electrode of the wet type electrostatic precipitator of the present invention described above, the main energizing path is made to be an energizing spring so as to always press between the discharge plates, thereby preventing the electrode support from being loosened. can do. In addition, since the spacer is made of resin, it has high corrosion resistance even when exposed to corrosive gas. Further, since the annular sealing material is provided between the upper and lower ends of each spacer and each discharge plate, it is possible to prevent the corrosive gas from entering the spacer.

[Brief description of the drawings]

FIG. 1 is a partially enlarged view of a discharge electrode of a wet type electrostatic precipitator of the present invention.

FIG. 2 is a side view of the wet electric precipitator.

FIG. 3 is a view as viewed in the direction of arrows AA in FIG. 2;

FIG. 4 is a partially enlarged view of FIG. 2;

FIG. 5 is a partially enlarged view of FIG. 4;

FIG. 6 is a partially enlarged view of a discharge electrode of the wet electrostatic precipitator according to claim 3 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric dust collector 2 Stand 3 Box-shaped container 3a Hopper 3b Drain discharge pipe 4 Exhaust gas introduction pipe 5 Clean gas introduction pipe 6 Dust collection pole suspension frame 7 Power supply material 8 Electrode 9 Core rod 10 Discharge plate 10a Hole 10b Projection 11, 11A Spacer DESCRIPTION OF SYMBOLS 12 Dust collection electrode 13 Support frame 14 Insulator 17 Exhaust gas 18 Clean gas 19 Inlet distribution plate 20 Sealing material 21 Energizing spring (coil spring) 21A Energizing spring (disc spring) 22 High voltage power supply device 23 Water seal device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takanori Fukuda 3-1-1-15 Toyosu, Koto-ku, Tokyo Ishikawajima-Harima Heavy Industries, Ltd. Tokyo Engineering Center Basic Research Laboratory (72) Inventor Teruaki Kawamoto Toyosu, Koto-ku, Tokyo 3-chome 1-115 F-term in ITEC Co., Ltd. (reference) 4D054 AA02 AA09 BA01 BA11 BB03 BB06 BB27 BB28 BB30 EA21 EA23

Claims (4)

[Claims] 1. A plurality of discharge plates having a hole at the center and a plurality of projections with a sharp tip on the outer periphery in a radial shape, and a plurality of cylindrical spacers for maintaining a constant vertical spacing between the respective discharge plates. In the discharge electrode of a wet-type electrostatic precipitator having a core rod penetrating through a hole of each discharge plate and a hollow portion of the spacer and being continuously connected up and down, the spacer is made of resin, and the core is provided in the hollow portion. A discharge electrode for a wet-type electrostatic precipitator, comprising a spring for energizing the rod so as to surround the rod and press against the lower surface of the upper discharge plate and the upper surface of the lower discharge plate. 2. The discharge electrode for a wet-type electrostatic precipitator according to claim 1, further comprising an annular sealing member which is in contact with upper and lower ends of the spacer and upper and lower surfaces of the discharge plate. 3. The discharge electrode for a wet type electrostatic precipitator according to claim 1, wherein said energizing spring is made of metal such as stainless steel, and is a coil spring or a disc spring. 4. The sealing material according to claim 2, wherein the sealing material is made of rubber.
The discharge electrode of the wet electrostatic precipitator as described.