JP2002210386A - Electrode of wet electric precipitator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent loosening of an electrode supporting portion due to corrosion of a spacer, to secure conductivity, to improve dust collection performance, and to facilitate partial replacement of a discharge plate and a spacer. SOLUTION: A plurality of discharge plates 1 having a hole 10a at the center and a plurality of projections 10b having a sharp tip on the outer periphery in a radial shape.
0, and a plurality of cylindrical spacers 11A for keeping the vertical spacing of each discharge plate 10 constant, and the discharge of the wet-type electrostatic precipitator 1 in which each discharge plate 10 and the spacer 11A are continuously connected vertically. In the electrode 8, the spacer 11A has a male screw portion 11a on the upper or lower end surface and a female screw portion 11b on the lower or upper end surface.
0 and the external thread 11a and the internal thread 11b
And are continuously connected by screwing.

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 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 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 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 problems. The spacer is formed by a cylindrical rod-like member, and a male screw portion and a female screw portion are continuously screwed between upper and lower spacers. Wet type electrostatic precipitator that can be electrically connected to prevent loosening of the electrode support due to spacer corrosion, ensure electrical conductivity, improve dust collection performance, and facilitate partial replacement of discharge plates and spacers The purpose of the present invention is to provide a discharge electrode.

[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 in a radial direction, and each discharge plate In the discharge electrode of a wet electrostatic precipitator having a plurality of cylindrical spacers that keep the upper and lower intervals constant, and each discharge plate and the spacers are continuously connected up and down, the spacers are provided on the upper or lower end surface. The male screw portion has a female screw portion on the lower or upper end surface, and the male screw portion and the female screw portion are screwed and continuously connected with the discharge plate sandwiched between the spacers.

Next, the operation of the present invention will be described. The spacers are formed of cylindrical rod-shaped members such as stainless steel, and the male screw provided on the upper or lower surface of each spacer and the female screw provided on the lower or upper surface of the spacer are screwed together to discharge between the upper and lower spacers. Since the plates are sandwiched between them, they can be brought into complete contact and reliable energization can be ensured. Further, it is possible to easily replace the discharge plate or the spacer by simply removing the screw engagement between the male screw portion and the female screw portion.

[0013]

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 8 denotes a discharge electrode. Reference numeral 10 denotes a plurality of discharge plates having a hole 10a at the center and a plurality of projections 10b having a sharp tip on the outer periphery in a radial shape. Reference numeral 11A denotes a plurality of spacers, which are formed of cylindrical stainless steel rod-shaped members, maintain a constant interval between the upper and lower sides of each discharge plate 10, and connect the discharge plates 10 one after another to connect them vertically. ing. 11a is a male screw part provided on the upper end face of the spacer 11A, and 11b is a female screw part provided on the lower end face of the spacer 11A. The discharge electrode 8 is formed by a plurality of discharge plates 10 and a plurality of spacers 11A.
In A, the male screw 11a and the female screw 11b are screwed and connected continuously.

Next, the operation based on the embodiment will be described. The spacer 11A is formed of a cylindrical rod-shaped member such as stainless steel, and the male screw 11a provided on the upper or lower surface of each spacer 11A and the female screw 11b provided on the lower or upper surface of the spacer 11A are screwed together. Since the discharge plate 10 is sandwiched between the spacers 11A,
They can be brought into complete contact and reliable energization can be ensured. In addition, partial replacement of the discharge plate 10 and the spacer 11A can be facilitated only by removing the screwing of the male screw portion 11a and the female screw portion 11b.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously changed 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.

[0016]

According to the discharge electrode of the wet type electrostatic precipitator of the present invention described above, the spacer is formed of a cylindrical rod-shaped member such as stainless steel, and the male screw provided on the upper surface of each spacer and the lower surface of the spacer are provided. The female screw is screwed together with the upper and lower spacers so that the discharge plate is sandwiched between the upper and lower spacers. Further, it is possible to easily exchange parts of the discharge plate and the spacer simply by removing the engagement between the male screw and the female screw.

[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;

[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 11a Male thread 11b Female thread 12 Dust collecting electrode 13 Support frame 14 Insulator 17 Exhaust gas 18 Clean gas 19 Inlet distribution plate 22 High voltage power supply

 ──────────────────────────────────────────────────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 BA06 BA11 BB06 BB12 BB16 BB26 BB30 BC02 BC09 BC38 EA21

Claims (1)

[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 the respective discharge plates and spacers continuously connected up and down, the spacer has a male screw portion on an upper or lower end surface and a female screw portion on a lower or upper end surface. A discharge electrode for a wet type electrostatic precipitator, wherein a male screw portion and a female screw portion are screwed and connected continuously with a discharge plate interposed between spacers.