RU2370320C1 - Electric filter with displaced longitudinal inserts of corona-forming electrodes - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: electric filter is suggested for dedusting of waste gases of industrial enterprises in power industry, metallurgy, construction material industry, etc. Electric filter comprises body, hoppers, collecting electrodes and corona-forming electrodes, which consist of tubular frames with tubular horizontal inserts arranged along the whole length of device. Technical result of invention is achieved by reduction of semipassive zone impact, since horizontal inserts are broken in parts and in each level they are displaced up or down in vertical plane of frame relative to each other at the distance from 10 mm to half-distance between inserts of neighboring levels.

EFFECT: higher efficiency of electric filter operation.

1 dwg

Description

An electrostatic precipitator refers to devices for dedusting exhaust gases from industrial enterprises in the electric power industry, metallurgy, building materials industry, etc.

Known electrostatic precipitators (analogue) with corona electrodes made of tubular frames [1]. In these frames, horizontal pipes are installed at several levels between the vertical pipes, located along one axis at each level.

The prototype of this invention is a commercially available electrostatic precipitator type EHAV [2]. In these electrostatic precipitators, the horizontal pipes of the corona elements are located along one horizontal axis along the length of the entire electrostatic precipitator. Corona elements with needles that create corona current are attached to horizontal pipes with the help of pins or half-clamps. In the space between the horizontal tubes of the frames of the corona electrodes and the precipitation electrodes there are no corona needles and, therefore, there is practically no corona current. This space is called semi-active.

As laboratory experiments showed, dust deposition on precipitation electrodes from this semi-active space does not occur. The reason for non-precipitation of dust is that, due to the absence of corona needles and the absence of corona current, particle charging does not occur, and despite the presence of an electric field, dust particles do not precipitate.

The semi-active zone in electrostatic precipitators of the EGAV type extends along the entire electrostatic precipitator along its entire length and makes approximately 3 to 7% of the entire active zone for various sizes. This significantly increases dust emissions from the electrostatic precipitator and is a fundamental disadvantage of the analogue and prototype. The objective of the invention and the technical result achieved by solving it are to increase the efficiency of the electrostatic precipitator by reducing the influence of the semi-active zone.

The specified technical result is achieved in that the horizontal inserts are divided into parts and in each level are shifted up or down in the vertical plane of the frame relative to each other at a distance of 10 mm to half the distance between the inserts of adjacent levels.

These signs are significant and form a set of significant decisions sufficient to obtain the required technical result.

The possibility of carrying out the invention, characterized by the above set of features, as well as the possibility of implementing the invention can be confirmed by the description of one of the possible designs of the device made in accordance with the proposed invention.

The invention is illustrated graphic material.

The drawing shows a variant of the electrostatic precipitator with offset longitudinal inserts of the corona electrodes, where

1 - hopper electrostatic precipitator;

2 - electrostatic filter housing;

3 - corona electrode;

4 - elements of the corona electrode;

5 - horizontal insertion of the corona electrode;

6 - vertical insertion of the corona electrode;

7 - precipitation electrode;

8 - device for shaking the corona electrode (conventionally shown by an arrow);

Δa is the offset of the longitudinal inserts of the corona element.

The corona elements (3) are a rigid structure consisting of pipes - horizontal (5) and vertical (6) inserts. Corona elements (4) are installed between the horizontal inserts, creating an active zone located between the precipitation electrodes (7). Precipitation (7) and corona (3) electrodes are located in the housing (2). The trapped dust enters the bins (1) under the action of shaking mechanisms of the corona (8) and precipitation electrodes.

Horizontal inserts are shifted up and down relative to each other by a distance of 10 mm to half the distance between the inserts of adjacent levels. The minimum displacement of the inserts (10 mm) is due to the fact that a further decrease in the displacement no longer leads to a decrease in the inactive zone. The maximum possible displacement is equal to half the distance between the inserts of adjacent levels.

The operation of the electrostatic precipitator with offset longitudinal inserts of the corona electrodes is as follows.

A gas containing particles to be trapped enters the space between the precipitation (7) and corona (3) electrodes.

The main part of the gas moves through the core created by the corona elements (4). Here the particles are intensively charged and trapped on precipitation electrodes.

Another part of the dust and gas stream (approximately 3 ... 7% of the main part of the stream) enters the semi-active zones created by horizontal inserts of the corona electrodes (5), where the particles are not charged. However, due to the displacement of the longitudinal inserts, a dust having a weak charge falls during its further movement into the active zone, where dust is effectively charged and deposited. As a result, there is no through movement of lightly charged dust through the entire electrostatic precipitator, and the degree of gas purification by the electrostatic precipitator increases.

Laboratory experiments performed on a small-sized electrostatic precipitator simulating the interelectrode gaps of an industrial electrostatic precipitator showed that the width of the semi-active zones Δa, starting from 10 mm, reduces the influence of inactive zones. The shift of horizontal inserts to a greater distance eliminates the negative influence of semi-active zones. The present invention may be applicable in the manufacture of industrial electrostatic precipitators, for its implementation does not require the development of new technologies.

Literature

1. Uzhov V.N. Industrial gas purification by electrostatic precipitators. M., "Chemistry", 1967.

2. Ecotechnics. Edited by Chekalova L.V., Yaroslavl, Rus, 2002.

Claims (1)

An electrostatic precipitator consisting of a housing, bins, precipitation electrodes and corona electrodes consisting of tubular frames with tubular horizontal inserts, characterized in that the horizontal inserts are divided into parts and at each level are displaced up or down in the vertical plane of the frame relative to each other at a distance from 10 mm to half the distance between inserts of adjacent levels.

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