SU963565A1 - Gas cleaning method - Google Patents

Description

The invention relates to the field of dust collection and is intended for the purification of gas and dust emissions from mining plants.

A single-zone electrostatic precipitator is known, in which the active part is a system of discharge and collecting electrodes.

Precipitation electrodes are made of tubes installed against each corona-forming electrode, the Precipitation electrodes are grounded and connected to the positive pole of the high-voltage rectifier of the electrostatic precipitator, and the corona electrodes are insulated from the ground and affixed to the negative pole.

However, such electrostatic precipitators are characterized by a low gas filtration rate (up to 2 m / s), which predetermines the large size of the apparatus, and the accumulation of dust on the collecting electrodes leads to a deterioration of the electrical parameters of the electrostatic precipitator. In addition, additional means are required to remove dust from the pickling electrodes.

A known method of purifying gas in a constant and alternating electric field, consisting in the deposition

particles under the action of a constant field on the precipitation system in the form of metal conductors, which are additionally supplied with alternating high voltage 2. However, with this method, the deposition efficiency is not high due to the undeveloped deposition surface.

The aim of the invention is to increase the gas filtration rate and the deposition efficiency by increasing the deposition surface.

The goal is achieved by the fact that the metal conductors of the settling systems are insulated through one and the alternating voltage is applied to the insulated conductors until the barrier discharge and formation between them. metal and insulated

conductors of highly concentrated plasvl.

The drawing shows a schematic diagram of an electrostatic precipitator for the implementation of the proposed method.

25

The electrostatic precipitator contains a housing (not shown) and a system of corona 1 and collecting 2, 3 electrodes placed in it.

Corona electrodes can be

30 are made with needle or wire and placed above the salivary electrodes. A constant high voltage is applied to the coroniruk.

The deposition system is alternating metallic 2 and insulated (dielectric-coated tubular electrodes 3. Electrodes 2 are grounded, and alternating high voltage is applied to electrodes 3. The ratio of the distance between the precipitating electrodes to the diameter should be greater than 0.5. applying a high voltage to the electrodes of the deposition system, providing a field strength of 210-5 "10 V / m, at the time the breakdown voltage is reached between the metal and insulated electrodes A zone of intense discharge 0} is created due to ionization of air in the interelectrode space — a barrier, a discharge accompanied by the formation of cold plasma. Due to the high plasma concentration, the O region between the metal and insulated electrodes becomes conductive.

When applied to the control electrodes of a constant high voltage, a corona discharge occurs between the needle, electrodes and the plasma. The corona-charged particles under the action of electric tulle are directed to the area of volume barrier discharge (plasma) and, without encountering an obstacle, enter the bunker.

The technical and economic advantages of the invention are as follows. The presence of conductive plasma contributes to an increase in the sedimentation surface. They allow to use the corona field more efficiently and to significantly improve the volts, the first characteristics of the device. In this case, the alternating field of high voltage due to the continuous re-discharge and repulsion of dust particles from the electrodes eliminates the deposition of dust particles in the zone.

barrier discharge on the elements of the deposition system.

The expected economic effect is to eliminate the need for additional re-radiating devices for the elements of the deposition systems. This makes it possible to eliminate re-entrainment of dust from collecting electrodes, and consequently, increase the filtration rate of the gas and

dust collection efficiency. The magnitude of the technical and economic effect, taking into account these advantages with a dust collection system capacity of 1 million m / h, is about 20,000 rubles compared with the use of lime electrostatic precipitators.

The proposed method allows for the learning of a social effect, consisting in increasing the degree of purification

air pollution and, consequently, in creating the best sanitary and hygienic working conditions in enterprises.

Claims (2)

Invention Formula The method of gas cleaning in constant and alternating electric fields, consisting in the deposition of particles under the action of a constant floor on the precipitation system in the form of metal conductors, which are additionally supplied with alternatingly high voltage, is also distinguished by the fact that and the deposition efficiency by increasing the deposition surface, the metal conductors of the precipitating system are insulated through one, and the alternating voltage is applied to the insulated conductors 0 before obtaining a barrier discharge and formation between metallic and insulated plasma conductors. Sources of information taken into account in the examination 5 1. Grebenshchikov L.S. and others. The use of electrostatic precipitators to dedust the mine air. M., 1977, p. 9. 2. Patent GDR. No. 59280, 12 e 5, 0 1967 C prototype)., t: l 7 /  / N / /  / V / / / / / / /  L L I L / / / / .iriffirijBCZJ 1J . l /