JP2002210384A - Discharge electrode of wet electric dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve dust collection performance by installing an energizing spring as a part of main current-carrying pathway to prevent 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 11 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 11 to connect them vertically and continuously. An energizing spring 21 is installed between an upper discharge electrode support frame 6 for supporting the core rod 9 and the top discharge plate 10 so as to surround the core rod 9 and press against the upper discharge electrode support frame 6 and the top 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 of a wet electrostatic precipitator, and more particularly to a discharge electrode of a wet 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 along the line AA of 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. Reference numeral 3 denotes a vertically long box-shaped container which stores 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 an upper discharge electrode support frame that supports the upper end of the discharge electrode 8. 6a is a lower discharge electrode support frame that supports the lower end of the discharge electrode 8.
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. 11 is the upper and lower discharge plates 10
Are a plurality of cylindrical spacers that keep the distance between the spacers constant. Reference numeral 13 denotes a plurality of support frame frames for supporting the dust collection electrodes 12. The dust collection electrodes 12 are formed by connecting stainless steel flat plates in a hexagonal shape and by combining a plurality of flat plates into a honeycomb shape.
14 is an insulator. Reference numerals 15 and 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 steel dish-shaped discharge plates 10 having a hole 10a at the center and a plurality of projections 10b having a sharp tip at 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 fastened 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. The dust collection electrode 12 may be a flat plate instead of the round bar 12a, 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 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-mentioned wet type electrostatic precipitator, each spacer is used as a main energizing path. However, since the spacer is exposed to corrosive gas, high corrosion-resistant stainless steel must be used, which is expensive. Not only that, the properties vary from plant to plant, so that a great deal of labor is required to select corrosion resistant materials. If the spacer is corroded and the length is reduced, the upper and lower electrode support parts will be loosened and the conductivity will deteriorate,
Dust collection performance will be reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a part of a main power supply path is provided with a power supply spring to prevent loosening of an electrode support due to corrosion of a spacer. It is an object of the present invention to provide a discharge electrode of a wet electric precipitator capable of improving dust collection performance.

[0011]

According to the discharge 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 in a radial manner, A wet-type electrostatic precipitator having a plurality of cylindrical spacers for keeping the upper and lower intervals of the plate 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 discharge electrode, a spring for energizing so as to press the upper discharge electrode support frame and the uppermost discharge plate by surrounding the core rod between the upper discharge electrode support frame supporting the core rod and the uppermost discharge plate. Is interposed.

In place of the upper discharge electrode support frame and the uppermost discharge plate, a core rod is surrounded between the lower discharge electrode support frame and the lowermost discharge plate to form the lower discharge electrode support frame. An energizing spring may be interposed so as to press against the lower discharge plate.

[0013] Also, instead of between the upper discharge electrode support frame and the uppermost discharge plate, a current supply spring is interposed between the intermediate discharge plate and the discharge plate so as to press the discharge plate between the discharge plates. May be mounted.

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

Next, the operation of the present invention will be described. A part of the main energizing path is used as an energizing spring, and between the discharge plates,
Since the pressing is performed, it is possible to prevent the electrode support portion from being loosened due to the corrosion of the spacer, and it is possible to secure the conductivity.

[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 not be repeated.
In FIG. 1, reference numeral 6 denotes a discharge electrode suspension frame for suspending the discharge electrode 8. 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 1 for keeping the upper and lower intervals of each discharge plate 10 constant
The core rod 9 is formed by vertically penetrating the hole 10a of each discharge plate 10 and the hollow part of the spacer 11 and penetrating the core rod 9 vertically. Are fastened to the lower discharge electrode suspension frame 6a with nuts 9a. Reference numeral 21 denotes a metal coil spring made of stainless steel or the like interposed between the upper discharge electrode supporting frame 6 supporting the core rod 9 and the uppermost discharge plate 10 so as to surround the core rod 9. The space between the support frame 6 and the uppermost discharge plate 10 is always pressed.

The energizing spring 21 is interposed between the lower discharge electrode support frame 6a and the lowermost discharge plate 10 so as to surround the core rod 9, so that the lower discharge electrode support frame 6a and the lowermost discharge plate are disposed. The space between the plates 10 may be constantly pressed.

Next, the operation based on the embodiment will be described. A part of the main current path is formed as a current spring 21 so that the space between the upper discharge electrode support frame 6 and the uppermost discharge plate 10 is always pressed, so that the electrode support portion is prevented from being loosened due to corrosion of the spacer 11. be able to.

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 drawing, the discharge electrode 8 of the wet type electrostatic precipitator is provided with a coil spring 21 so as to surround the core rod 9 between the discharge plate 10 and the discharge plate 10 in the middle of the discharge type electrode 8 of the wet type electric precipitator described in FIG. They are interposed,
The space between the discharge plates 10 is always pressed.
The other parts are the same as those of the discharge electrode 8 of the wet electrostatic precipitator 1 described with reference to FIG.

FIG. 7 is a partially enlarged view of the discharge electrode of the wet type electrostatic precipitator according to the fourth aspect of the present invention. In the drawing, the discharge electrode 8 of the wet type electrostatic precipitator is a stainless steel disc spring 21A as a current-carrying spring of the discharge type electrode 8 of the wet type electric precipitator described in FIG.
Is used. The disc spring 21A is a metal disc spring made of stainless steel or the like. The disc spring 21A is interposed between the upper discharge electrode support frame 6 and the uppermost discharge plate 10 so as to surround the core rod 9 and supports the upper discharge electrode. Frame 6 and top discharge plate 1
The interval between 0 is always pressed.

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.

[0022]

According to the discharge electrode of the wet type electrostatic precipitator of the present invention described above, a part of the main current path is formed as an energizing spring so that the discharge plates are always pressed between the discharge plates. This has the effect of preventing loosening.

[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.

FIG. 7 is a partially enlarged view of a discharge electrode of the wet electric precipitator according to claim 4 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 electrode suspension frame 7 Power supply material 8 Electrode 9 Core rod 10 Discharge plate 10a Hole 10b Projection 11 Spacer 12 Collection Dust electrode 13 Support frame 14 Insulator 17 Exhaust gas 18 Clean gas 19 Inlet distribution plate 20 Sealing material 21 Spring for current application (coil spring) 21A Spring for current application (disc spring) 22 High voltage power supply device 23 Water seal device

Continued 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 3-1-1 Toyosu, Koto-ku, Tokyo No. 15 F-term in ITEC Co., Ltd. (reference) 4D054 AA02 AA09 BA01 BA11 BB03 BB06 BB27 BB28 EA21 EA23

Claims (4)

[Claims] 1. A plurality of discharge plates having a hole at the center and a plurality of protrusions having 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. A discharge pole of a wet type electrostatic precipitator having a core rod penetrating through the hole of each discharge plate and the hollow part of the spacer and being continuously connected up and down. A discharge electrode for a wet-type electrostatic precipitator, wherein a spring for energization is provided so as to surround a core rod between the upper discharge plate and the upper discharge electrode support frame and press the uppermost discharge plate. . 2. A lower discharge electrode supporting frame which surrounds a core rod between the lower discharge electrode supporting frame and the lowermost discharge plate instead of between the upper discharge electrode supporting frame and the uppermost discharge plate. 2. The discharge electrode for a wet type electrostatic precipitator according to claim 1, wherein a current-carrying spring is interposed so as to press against the lowermost discharge plate. 3. A current-carrying spring for pressing the discharge plate between the intermediate discharge plate and the intermediate discharge plate instead of between the upper discharge electrode support frame and the uppermost discharge plate. The discharge electrode of the wet type electrostatic precipitator according to claim 1 mounted. 4. The discharge electrode 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.