JPS60106553A - Electric type precipitator with rigid discharge electrode - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic precipitator, and more particularly to an electrostatic precipitator with a rigid discharge electrode having inherent structural integrity by design.

When operating a conventional electrostatic precipitator, a gas containing entrained dust particles is passed through an electrostatic field formed around a discharge electrode placed between two grounded collecting electrodes. There is. These floating particles become electrically charged as they pass through the electrostatic field, move under the influence of the electrostatic field, and adhere to the grounded dust collecting electrodes on the left and right sides of the discharge machine. Generally, each collector pole is formed from one or more elongate plates disposed and suspended in a vertical plane from the top of the collector housing. Collection electrodes of this type are arranged in large numbers laterally across the collector housing in spaced vertical planes parallel to the direction of gas flow through the collector.

In the most common electrostatic precipitator, referred to as an electric rigid frame precipitator, the box-shaped frame structure uses a vertically arranged row of discharge electrodes across the width of the precipitator to connect adjacent precipitator electrodes. It consisted of a plurality of discharge electrode frames mounted on a frame structure suspended from an insulator at the top of the precipitator housing. A voltage is applied to the discharge electrode to generate an electrostatic field. Each discharge electrode frame consists of a plurality of individual flexible discharge electrode wires stretched taut across a support frame.

These discharge electrode wires are mounted at ambient temperature, but 1
Because it is operated in a temperature range of 50 DEG to 250 DEG C., it becomes stretched due to thermal expansion and therefore becomes slack. The discharge electrode wire may also become loose due to the selection of the discharge electrode frame and handling during transportation.

Although a loose discharge electrode wire does not interfere with the dust collection process itself, it cannot sufficiently prevent the dust from being damaged.

Additionally, flexible discharge electrode wires are structurally weak and are susceptible to failure under the tension required to hold them taut or from repeated fatigue from whipping or thermal cycling. If the discharge electrode wire were to break, it would be moved by the gas flow and come into contact with the collector electrode, causing a short circuit in the collector and requiring removal of the collector from service.

OBJECTS OF THE INVENTION It is therefore an object of the present invention to have an inherent structural integrity, which allows the electrode to maintain its shape and rigidity during operation, while at the same time creating a satisfactory electrostatic field between the collecting electrode plates. An object of the present invention is to provide an electrostatic precipitator equipped with a discharge electrode capable of generating dust.

SUMMARY OF THE INVENTION The invention provides a housing defining a collection chamber through which a horizontal flow of the gas to be purified passes, and a housing disposed within the collection chamber in vertical planes spaced apart and parallel to the direction of gas flow through the collection chamber. A dust collecting electrode means consisting of a plurality of dust collecting electrode plates, and a plurality of discharge electrode members arranged parallel to the dust collecting electrode plates and alternately interposed between these plates, generating an electrostatic field. An electrostatic precipitator comprising a discharge electrode means supporting a plurality of rigid discharge electrodes, each discharge electrode part being spaced apart and extending vertically, to which a voltage is applied. provided.

The rigid discharge electrode of the present invention is formed into an elongated ribbon-like corona emitter having a centerline extending longitudinally, and an elongated ribbon-like corona emitter extending in a row longitudinally along the centerline of the elongated ribbon-like corona emitter. , and multiple waveforms that provide structural stiffness to the corona emitter.

Preferably, in order to impart further structural stiffness to the elongated ribbon corona emitter, an omega-shaped groove is formed extending along the length of the corona emitter K, its longitudinally extending centerline, and further extends along the length of the elongated ribbon corona emitter. The wood is placed coaxially within the omega-shaped groove. The diameter of the bar is sized such that the bar is held in place within the omega-shaped groove by frictional forces therewith.

Additionally, corona discharge means are spaced apart along the longitudinally extending lateral line of the corona emitter to enhance the corona discharge of the elongated ribbon corona emitter. Preferably, the corona discharge means comprises a plurality of serrations cut into the longitudinally extending lateral line of the elongated ribbon corona emitter at intervals along its length.

The present invention may be better understood, and other objects of the present invention will become apparent when reference is made to the accompanying drawings and considered in light of the following description of preferred embodiments of the invention. You will be able to recognize it correctly.

Embodiments of the Invention The present invention will be described in detail below based on embodiments shown in the accompanying drawings.

Reference is made to the accompanying drawings, in particular figures 1 and 2 thereof,
There is shown an electrostatic precipitator 10 having a housing 12 with a gas inlet 2 and a gas outlet 4, and a dust collection chamber 6 arranged between these inlets and outlets. The dust-containing flue gas to be purified is transferred to the housing 12 of the dust collector lO.
From the gas population 2 passing through the interior, the gas passes through the dust collection chamber 6 and is discharged from the gas outlet 4 as a clean gas containing relatively few dust particles.

The basic structure of the dust collector IO is well known in the art and is commonly referred to as a rigid discharge electrode type electrostatic dust collector. The substantially rectangular dust collecting electrode plate 22 is
The dust collection chambers 6 are spaced substantially parallel to each other in a vertical plane.
A plurality of dust collecting electrode plate means 2° are arranged inside the dust collecting electrode plate means 2°. Furthermore, the dust collection electrode plate 2
A plurality of discharge electrode members 32 are inserted in the space between the two,
These also collectively form the discharge electrode means 30.

Both the collecting electrode plate 22 and the discharge electrode member 32 are arranged in parallel and extend in the direction of the gas flow through the collecting chamber 6 from its population 2 to the outlet 6.

Each of the dust collection electrode plates 22 is suspended and supported from an upper support beam 14 arranged across the dust collection chamber 6. The lower end of each suspended dust collection pole plate 22 is prevented from moving by inserting it into a guide member 16 attached to a lower support beam 18 disposed at the bottom of the dust collection chamber 6. suppressed laterally. Therefore, these suspended and supported dust collection electrode plates 22 have a height of 12~
It has a height within the range of 50 feet (3 to 15 m), and is free to move vertically and downwardly within the guide member 16 due to temperature effects, but no lateral movement is allowed by the guide member 16. It is suppressed like that.

Although the collection electrode plate 22 is shown in the accompanying drawings as having a particular cross-section, this is for illustrative purposes only and not as a limitation. The present invention contemplates the use of dust collecting electrode plates having any of a number of cross-sectional designs, and the particular design utilized under certain predetermined conditions will determine the optimal dust removal efficiency. It should be understood that the selection is made based on individual criteria to provide an area of inactivity on the surface of the collection electrode plate 220.

The individual discharge electrode members 32 are assembled or connected with a support bar 34 supporting the discharge electrode members 32 to form a discharge electrode means 30, and this discharge electrode means 30 is connected to the top of the dust collection chamber 6. It is suspended and attached to the housing 12 via an insulator 40. As best seen in FIG. 3, the individual discharge electrode sections 32 extend laterally between the upper frame member 33 and the lower frame member 350, respectively.
and is formed from a plurality of individual rigid discharge electrodes 50 spaced apart to be mounted on both of these members. Support bar 34 supporting individual discharge electrode members 32
an insulator 4 which extends laterally in the upper region of the housing 12 across the inlet 2 and outlet 4 of the dust collection chamber 6 and is mounted on the air housing 12 (by means of a support rod 38).
It is suspended from 0. The upper frame member 33 of each discharge electrode member 32 extends laterally between the discharge electrode members such that a single discharge electrode member 32 is suspended between each pair of collection electrode plates 20Q in a vertical plane equidistant therefrom. Support bar 3 to be lowered
It is installed at 4. In addition, each discharge electrode member 3
The second lower frame member 35 has a pair of lower support bars 37
Although iC mounted, this lower support bar extends laterally across the collection chamber 6 to provide additional structural rigidity to the discharge electrode means 30.

In operation, dust-laden gas enters the housing 12 of the dust collector through its gas port 2 and then flows through the dust collection chamber 6 to its gas outlet 4. As it traverses the dust collection chamber 6, the dust-containing gas flows between the spaced collection electrode plate means 200 and over the discharge electrode member 32 suspended between them. An electric charge is applied to each of the discharge electrode members 32 to form an electrostatic field that spreads between the discharge electrode members and the grounded dust collection electrode plate 220. When the dust particles in the dust-containing gas pass through the dust collection chamber 6, they are ionized, migrate toward the dust collection electrode plate 22, and adhere thereto.

In accordance with the present invention, as best understood from FIGS. 4, 5 and 6, the vertically extending discharge electrodes 50 of the discharge electrode member 32 each have a longitudinally extending centerline 50.
an elongated ribbon-like corona emitter 52 having 3;
A plurality of corona discharge means 54 are arranged at regular intervals on a side line portion 55 extending in the longitudinal direction of the corona emitter 52, and a plurality of corona discharge means 54 are provided with respect to the center line 53 thereof as a means for imparting structural stiffness to the ribbon-shaped corona emitter 52. The corona emitter is formed with a plurality of corrugations 60 extending in parallel in the vertical direction. The ribbon corona emitter 52 may be an elongated ribbon corrugated sheet as shown in FIG.
is preferably an elongated flat sheet having 6° spaced corrugations as shown in FIGS. 4 and 5.

It should be noted that the corona discharge means 54 arranged at intervals along the side ksss of the corona emitter 52 may be any of the many known corona discharge means.
Preferably, there are a plurality of serrations 62 cut along the length of the vertically extending side edges 52 of the corona emitter 52 . The spacing between these serration points 62 as well as their specific shape can be chosen depending on the circumstances to obtain the desired electrostatic field distribution around each corona discharge point 62.

Additionally, to increase the structural stiffness of the ribbon corona emitter 52, the elongated ribbon corona emitter 52 is provided with a structure along the length of its longitudinally extending centerline 53, as best seen in FIGS. It would be preferable to form an omega-shaped groove 56 that extends from one side to the other. An elongated bar 58 is disposed coaxially within the omega-shaped groove 56, thereby providing additional structural stiffness to the elongated ribbon corona emitter 52.

The rod 58 is selected to have a diameter such that it is held in place within the omega-shaped groove 56 by frictional forces with the groove. By suitably sizing the diameter of the bar 58, the ribbon corona emitter 52 is prevented from rotating about the longitudinal axis of the bar 58, thereby causing the ribbon corona emitter 52 to absorb the gas flowing through the collection chamber. It is designed so that it will not twist and pop out from the surface of the discharge electrode frame under the action. Although a plurality of shortened bar segments spaced apart along the length of the omega-shaped groove 56 will also provide enhanced structural stiffness to the discharge electrode 50, the elongated bar 58 Preferably, it extends substantially along the entire length of the omega-shaped groove 56.

A typical ribbon corona emitter 52 is a ribbon approximately 2 inches wide (5,1 cIIL) and 12 feet long (301) with two corrugations 60 formed for stiffness.
The corrugated ribbon 60 is a ribbon made of No. 6 to No. 18 steel, and the corrugations 60 are located on both left and right sides of the center line of the corona emitter 52. 1 ribbon material around the bar 58
The omega-shaped groove 56 is formed along the centerline 53 of the ribbon material by rolling the ribbon material while partially winding at an angle greater than 80° to prevent the bar from falling out of the omega-shaped groove. can be formed. By rolling the ribbon material around the bar 58, the ribbon corona emitter 52 is reliably prevented from rotating around the bar 58 due to frictional forces.

In addition, these serrated corona discharge points 62 are cut out at the side line portion 55 of the ribbon-shaped corona emitter 52 either before or during this rolling process. Additionally, mounting holes are formed at both longitudinal ends of the ribbon-shaped corona emitter 52 so that the discharge electrode 50 can be attached to the discharge electrode member 32 as described above.

The height of the discharge electrode member is from 12 feet (3 m) to 50 feet.
Since the height is most preferably within the range of (15 m), one or more ribbon-shaped corona emitters 52 can be connected to form a discharge electrode with a desired length as shown in FIG. It may be necessary to connect the ends of the two ribbon corona emitters 52 together using any of a number of means known in the art. Therefore, there is no specific means for connecting the emitters that is germane to the present invention.

Although the present invention has been described and explained with reference to the preferred embodiments illustrated in the accompanying drawings and which represent the best mode presently contemplated for carrying out the invention, there may be various variations in the illustrated embodiments. It should be understood that those skilled in the art may devise modifications to the invention without departing from the basic concept of the invention. We hope that the present invention will be interpreted accordingly.

[Brief explanation of drawings]

FIG. 1 is a partially sectional perspective view of a dry dust collector incorporating the rigid discharge electrode of the present invention. FIG. 2 is a plan cross-sectional view taken along line 2--2 in FIG. FIG. 3 is a side view of a single rigid discharge electrode of the present invention showing the tubular discharge electrode installed in the discharge electrode member. FIG. 4 is an enlarged side view of a single rigid discharge electrode of a preferred embodiment of the invention. FIG. 5 is a cross-sectional view of the rigid discharge electrode of FIG. 4. FIG. 6 is a cross-sectional view of a rigid discharge electrode according to another embodiment of the present invention. 2. Gas inlet, 4. Gas outlet, 6. Working dust collection chamber, lO
・・Electric dust collector, 12...]・Using, 14...
Upper support beam, 16.. Guide member 18.. Lower support beam, 20.. Dust collection electrode plate means, 22.. Dust collection electrode plate, 30.. Discharge electrode means, 32.. Discharge electrode member, 3.
3... Upper frame member, 34... Support bar, 35...
Lower frame member, 37.. Lower support bar, 38.. Support rod, 50.. Rigid discharge electrode, 52.. Ribbon-shaped corona emitter, 53.. Center +&, 5 ”. Corona discharge means, 55.. Side edge. Part, 56...Omega-shaped groove, 58...
Bar material, 60...corrugated, 62...serrated point. FIG, 2 FIG, 5 FIG, 6 FIG, 3 FIG, 4

Claims (1)

[Claims] 1. In an electrostatic precipitator, a lal dust collection chamber is defined,
and (b) a housing having a dust-laden gas inlet and a clean gas outlet so that a horizontal flow of the gas to be purified can be transferred through the dust collection chamber; a collection electrode means comprising a plurality of collection electrode plates arranged in spaced vertical planes parallel to the direction of flow;
tc+ A plurality of discharge electrode members arranged parallel to the dust collecting electrode plate and interposed alternately between the plates support a plurality of spaced apart and vertically extending rigid discharge electrodes, and each of the above-mentioned A rigid discharge electrode includes corona discharge means spaced along a longitudinally extending side edge of an elongated ribbon corona emitter having a longitudinally extending centerline; an electrostatic precipitator comprising a plurality of longitudinally extending corrugations formed therein which impart structural stiffness to said elongated ribbon corona emitter; 2. The corona discharge means comprises a plurality of serrations cut out at intervals along the length of the longitudinally extending lateral line of the elongated ribbon corona emitter. The electrostatic precipitator according to scope 1. 3 (a) an omega-shaped groove formed in said elongated ribbon corona emitter and extending along the length of a longitudinally extending centerline thereof; and (b) coaxially disposed within said omega-shaped groove. and imparting additional structural stiffness to the elongated ribbon corona emitter, the elongated bar being dimensioned such that the bar is held in position within the omega-shaped groove by frictional forces therewith. The electrostatic precipitator according to claim 1, further comprising a rod having a diameter of . 4. said elongated bar extends substantially along the entire length of said omega-shaped groove extending along the length of a longitudinally extending centerline of said elongated ribbon corona emitter. An electrostatic precipitator according to claim 3. 5. Claim characterized in that the corona discharge means consist of a plurality of serrations cut into the longitudinally extending side edges of the elongated ribbon corona emitter at intervals along its length. The electrostatic precipitator according to item 3.