RU2551516C2 - Electric precipitator - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention is referred to gas cleaning by electric precipitation from suspended particles in different industrial sectors, in particular in heat power industry, chemical industry, metallurgy, etc. The electric precipitator consists of a body, gas distributing plates, precipitating and corona-producing electrodes and mechanisms for electrodes shaking. The gas distributing plate at the precipitator output is double, at that one its part is movable and divided along its width into movable pieces, and moreover motion of the plate movable pieces is synchronised with shaking of the precipitating electrode placed opposite two movable parts of the gas distributing plate.

EFFECT: improving degree of gas cleaning by electric precipitation due to reduced values of repeated dust loss at shaking of the precipitating electrodes.

4 cl, 3 dwg

Description

The invention relates to the electrical cleaning of gases from suspended particles in various industries, in particular in the power industry, chemical industry, metallurgy, and others. An electrostatic precipitator is known, comprising a housing, corona and precipitation electrodes, mechanisms for their shaking and gas distribution grilles. (See. Uzhov VN Industrial gas purification by electrostatic precipitators .- M .: Chemistry 1967.) An electrostatic precipitator of the EGA type is also known. dust when shaking the collecting electrodes.

The technical task of the proposed solution is to increase the degree of gas purification by an electrostatic precipitator by reducing the amount of secondary dust entrainment by shaking the collecting electrodes. The specified technical result is achieved by the fact that the gas distribution grid at the outlet of the electrostatic precipitator is doubled, one of which is movable and divided in width into movable parts, and the movement of the moving parts of the mobile gas distribution grid is synchronized with the moment of shaking of the precipitation electrode located opposite two moving parts of the gas distribution grid. The movable parts of the movable gas distribution grid are located in front of the stationary gas distribution grid and during their movement overlap the holes in the stationary gas distribution grid for the duration of the shaking off dust. In addition, the movable lattice is divided in width into parts equal to the interelectrode gap, and two adjacent movable parts of the movable gas distribution grid lying opposite the shaken electrode are moved simultaneously.

These features are significant and interconnected with the formation of a stable set of essential features sufficient to obtain the desired technical result. The specified technical result is achieved by the fact that the electrostatic precipitator contains a movable gas distribution grid located next to the stationary gas distribution grill. When shaking off any precipitation electrode, part of the dust is carried away by the gas flow and goes beyond the field. To avoid this, two movable parts of the movable gas distribution grid, located opposite the shaken precipitation electrode, are moved so that they overlap the holes in the stationary gas distribution grid. In this case, the dust and gas flow rate at the shaking precipitating electrode sharply decreases, and dust entrainment is minimized. The overlapping time of the openings in the stationary gas distribution grid depends on the time of falling of the shaken off dust. As experiments show, it can be 4 ... 10 seconds, depending on the height of the electrode. The location of the movable lattice in front of the fixed one allows for more tight pressing and to reduce the flow of gas and dust through leaks between the gas distribution grilles. The separation of the movable grating in width into moving parts equal in width to the interelectrode gap allows only two adjacent moving parts of the movable gas distribution grating to be moved at a time. This achieves a minimal increase in gas velocity in the active zone of the electrostatic precipitator.

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 a design variant of the device made in accordance with the invention, the essence of which is illustrated in FIG. 1, 2, 3:

FIG. 1 - General arrangement of gas distribution grids at the outlet of the electrostatic precipitator,

Fig 2A - the Position of the gas distribution grills in the absence of shaking of the precipitation electrodes,

FIG. 2B - Position of the gas distribution grills when shaking the precipitation electrodes. FIG. 3 (view AA) in FIG. one.

The list of items in FIG. one

1. Electrofilter housing

2. Precipitation electrode

3. Corona electrode

4. Fixed gas distribution grill

5. Movable gas distribution grill

6. The mechanism of shaking the precipitation electrodes

7. Fist on the shaking shaft of the precipitation electrode

8. The lever of the drive of the movable gas distribution grid

9. Shaken out sedimentation electrode

10. Movable parts of the movable gas distribution grid

In FIG. 1 shows the last field of the electrostatic precipitator located in the housing 1. The field consists of precipitation 2 and corona electrodes 3. At the field outlet there are gas distribution grids: movable 5 and fixed 4. In FIG. 1 shows one of the deposit electrodes. Other precipitation electrodes have a similar appearance.

In FIG. 2A and 2B show gas distribution grids: movable 5 and fixed 4. The movable parts of the movable gas distribution grid are connected via a lever 8 to a mechanism for shaking the precipitation electrodes 6 having a cam 7.

In FIG. 3 (view A-A) shows the gas passages and the positions of the moving parts of the movable gas distribution grid while shaking one of the precipitation electrodes.

The functioning of the proposed electrostatic precipitator is as follows. The dust entering the electrostatic precipitator housing 1 together with the gas stream under the action of an electric field created by the corona electrodes 3 accumulates on the precipitation electrodes 2 and periodically shakes off (Fig. 1). At the same time, part of the dust removed by shaking is carried out by the gas flow outside the field. To drastically reduce dust entrainment by shaking the shaken sedimentation electrode 9, the gas flow is blocked by moving the movable part of the gas distribution grid 5 relatively motionless 4. At the same time, the openings in the gas distribution grilles overlap and the gas flow in two gas passages practically stops (Fig. 2). The two moving parts of the movable gas distribution grid are equal in width to the two gas passages. The parts of the gas distribution grid are moved from the mechanism of shaking the precipitation electrodes 6 through the lever 8 using the cam 7. As a result, the movement of the dust and gas stream from the interelectrode gap is blocked, in which the precipitation electrode is shaken (Fig. 3). The dust removed by shaking from the shaking precipitating electrode does not reach the output of the electrostatic precipitator, but is captured in the interelectrode gap, where the flow rate is close to zero. As a result, the overall degree of gas purification in the electrostatic precipitator increases. The present invention is industrially applicable, since its manufacture does not require special equipment and new technologies.

The design of the electrostatic precipitator described in this example and depicted in the graphic material is not the only one possible to achieve the above technical result and does not exclude other variants of its manufacture included in the independent claim.

These features are significant and interconnected with the formation of a stable set of essential features sufficient to obtain the desired technical result.

Due to the fact that in the upper part of the electrostatic precipitator the amount of dust carried away is less, the movable gas distribution grill can be reduced in height. In addition, the movement of the gas distribution grids can be used to reduce secondary entrainment and by shaking off the corona electrodes, for which the movement of the movable gas distribution grids can be synchronized with the shaking of the corona electrodes.

Claims (4)

1. An electrostatic precipitator consisting of a housing, gas distribution grids, precipitation and corona electrodes and mechanisms for shaking them, characterized in that the gas distribution grid at the outlet of the electrostatic precipitator is doubled, one of which is movable and divided in width into movable parts, and moving the movable parts of the gas distribution grid synchronized with the moment of shaking of the precipitation electrode, located opposite two moving parts of the gas distribution grid. 2. The electrostatic precipitator according to claim 1, characterized in that the moving parts of the movable gas distribution grid are located in front of the stationary gas distribution grid. 3. The electrostatic precipitator according to claim 1, characterized in that the moving parts of the movable gas distribution grid move and overlap the holes in the stationary gas distribution grid for the duration of the shaking off dust. 4. The electrostatic precipitator according to claim 1, characterized in that the movable gas distribution grid is divided in width into parts equal to the interelectrode gap of the electrostatic precipitator, and two adjacent moving parts of the movable gas distribution grid lying opposite the shaken electrode are moved simultaneously.

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