RU2343985C1 - Electrostatic trap - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: electrostatic trap is intended for dust flow stopping and dust escape prevention. Electrostatic trap includes receiving and discharge electrode system. Receiving electrodes are blocks with front mesh wall, side and top edges of non-magnetic material, and ferromagnetic back wall. Lower edge is absent to allow dust particles into the dust collection tank. Receiving electrodes are mounted parallel, with discharge electrode in the form of needle-point electrode system and semi-circular mesh-form element connecting discharge electrodes between them.

EFFECT: improved dust flow treatment quality, reduced power and material cost and cost of receiving electrode cleaning.

1 dwg

Description

The invention relates to electrical installations, in particular to installations of electron-ion technology, and can be used to block and suppress dust flows, retain dust particles in the area of the source of dust formation, as well as aggregate particles in the installation during loading and unloading operations in the metallurgical, cement, mining and processing, as well as in the building materials industry.

An analogue of the proposed technical solution is a dry electrostatic precipitator of the DGPN type, which has pocket precipitating electrodes that are assembled from separate vertically arranged plates with holes stamped at an angle of 40 degrees. When shaking, part of the ash falls into these pockets and then enters the hopper. Corona electrodes consist of bayonet wire elements strung in a tubular welded frame. Shaking the precipitation electrodes is carried out using spring-cam shaking mechanisms. (V.I. Levitov Smoke electrostatic precipitators. - M.: Energy, 1980).

The disadvantage of this design is that dust particles deposited on the electrodes lead to a decrease in the efficiency of the electrostatic precipitator and periodic cleaning of the precipitation electrodes is required at short intervals; in this design, the phenomenon of re-entrainment of dust from the surface of the precipitation electrodes takes place. Cleaning is done by a shaking mechanism, which requires additional energy and time for maintenance.

The closest technical solution to the proposed one is a device for blocking dust flows, which consists of two non-parallel flat sedimentation electrodes mounted at an acute angle to the horizontal plane without the possibility of touching the upper edges. In the space between the precipitation electrodes are the corona electrodes. Precipitation electrodes have a height equal to twice the distance between them in the lower part, and the lower corona electrode is located at a height equal to half the distance between the lower edges of the precipitation electrodes, and each subsequent corona electrode above it - with a step equal to half the distance between the lower edges of the precipitation electrodes . (RU 2212279 C1, publ. 09/20/2003)

The disadvantages of the above technical solutions include the phenomenon of secondary ablation of dust from the precipitation electrodes and the need for periodic cleaning of the precipitation electrodes.

The task to be solved in the proposed technical solution is to improve the quality of cleaning dust streams, reducing energy and material costs, as well as the cost of cleaning the precipitation electrodes.

The problem is solved as follows.

The electrostatic shutter contains a system of electrodes, one of which corona other precipitation, and the precipitation electrodes are made in the form of blocks, the front wall of which is made of mesh, the side and upper walls of non-magnetic material, the rear of ferromagnetic material. The deposition electrodes are parallel to each other, and the corona electrode consists of needle electrodes. In the gap between the precipitation electrodes there is a semicircular element connecting the precipitation electrodes made of mesh.

The device diagram is shown in the drawing.

The device consists of a corona 1 and two parallel precipitation electrodes 2 grid 3. The corona electrode 1 is a needle electrode system and is connected to the negative pole of the high voltage source (IVN), and the precipitation electrodes 2 to the positive pole of the IVN.

The electrostatic shutter operates as follows.

A difference in electric potentials is supplied to the precipitation 2 and corona 1 electrodes, and a region of space electric charge is formed around the corona electrode 1. Dust particles getting into the region of electric charge are polarized and experience two kinds of forces: one - directed towards the precipitation electrodes 2, and the second - directed radially to the surface of the semicircular grid 3, in the area of the pre-shutter (grid in the form of a semicircle), the flow of charged particles is directed counter to the main dust stream and scatters it. As a result of the action of the field, it turns out that the bulk of the dust stream is scattered in the area of the semicircular grid 3, and the remaining part is sent to the precipitation electrodes from the interelectrode space region.

Claims (1)

An electrostatic shutter, consisting of a system of electrodes, one of which is a corona electrode, the other is a precipitation electrode, characterized in that the electrodes are made in the form of blocks, the front wall of which is made of mesh, the side and upper walls are made of non-magnetic material, and the rear wall is made of ferromagnetic material that are parallel to each other, and the corona electrode consists of needle electrodes, and in the gap between the precipitation electrodes there is a semicircular element connecting the precipitation electrodes electrodes, which is made of mesh.