SU939089A1 - Method of removing dust out of electrodes - Google Patents

Description

(54) METHOD FOR REMOVING DUST FROM ELECTRODES

one

The invention relates to the control of a process for the purification of metallurgical gases in an electrostatic precipitator and can be used in industries in which dry electrostatic precipitators are used.

A known method of cleaning the collecting electrodes in electrostatic precipitators, is that the dust layer on the electrode is compacted with a frequency of 10 Hz, and then the dust separates from the electrodes 1 by oscillations of a slightly larger amplitude.

A disadvantage of the known method is that the shaking of the electrodes is performed at an operating voltage characterized by the presence of a corona discharge. At the same time, between the electrode and dust particles, there are forces of attraction, namely significant electrical and insignificant adhesion, resulting in a deterioration of the spinning process.

In the process of shaking when the working voltage of the corona discharge occurs, the layer of dust gradually breaks down, rather than dropping it in the form of large conglomerates, i.e., the dust is agitated and

as a consequence of this, secondary dust entrainment is increased.

There is also known a method for removing dust from electrodes, in that the electrodes are alternately connected to a direct current source and grounded using switch 2.

However, the method of removing dust from the discharge of the electrodes contributes to the increase of the secondary dust removal due to two-stage

, - dust removal process. When the discharge wires are grounded, part of the dust falls off, then when connected to a high voltage, a gust of ionic wind blows away the rest of the DUST; therefore, the dust is separated from the electrodes not in the form of large conglomerates that can fall into the bunker, but in the form of small aggregates, which significantly increases the secondary dust removal, thereby reducing the efficiency of the electrostatic dust collector: due to frequent switching

2- (several times per second) of the discharge electrodes, aerodynamic jolts arise and the dust in the gas flow will not have a directional movement towards the electrodes, but will oscillate and, without being deposited on the electrodes, will be removed from the working space of the electrostatic dust collector. When the electrodes are switched from the current source to the ground and back, undesirable phenomena such as deep arcing and breakdowns will occur due to the electrodes swinging and an abrupt voltage rise (in practice, a smooth voltage increase to the pre-breakdown is recommended). Consequently, the device will operate under the pressure of deep sparks and arc discharges, which will lead to a decrease in the service life of the process equipment and, consequently, to a decrease in the efficiency of the dust collector. The purpose of the invention is to increase the effect-15

the degree of purification of gases.

This goal is achieved by the fact that, in the method of removing dust from the electrostatic precipitator electrodes, by reducing the voltage of the electrodes and shaking them, the voltage on them is reduced to the voltage of the corona discharge and after shaking the electrodes, the voltage is increased to the operating value. As a result, only insignificant adhesion adhesion forces and dust 25 in the form of large conglomerates that are not carried away by the gas flow need to be overcome, easily separated from the electrodes and collapses into the bunker, which leads to a reduction in the period of drying the electrodes established experimentally and technological equipment service. Moreover, the corona discharge quenching voltage is determined by the absence of current in the circuit. Example. When the working voltage on the electrodes, determined by the presence of a corona discharge and equal, for example, 52 kV, between the dust layer and the collecting electrode, adhesive adhesion forces equal to 3-10® H and electrical adhesion forces, equal, for example, , 4.6-10 N. By the time of opening the voltage decreases to ° C before the voltage of the crown

Claims (2)

before the corona discharge quenching voltage, dust in the form of large conglomerates is separated from the electrodes, this reduces the secondary entrainment and decreases the discharge, for example, 10 kV, as a result of which only slight adhesion adhesion and dust in the electrodes are shaken the form of large conglomerates that are not carried away by the gas stream falls into the bunker. Then the voltage is raised to the previous working voltage. When conducting repeated studies conducted on electrical cleaning machines, waste,, their gases, smelting furnaces and converters, under industrial conditions of non-ferrous metallurgy enterprises and processing of research results using computational techniques, it was found that when the voltage drops to the moment of impact on the electrodes, Remove electrodes. This method of cleaning electrodes in an electrostatic precipitator improves the efficiency of the electrostatic precipitator and the degree of gas purification during the shaking of electrodes. DETAILED DESCRIPTION OF THE INVENTION A method for removing dust from electrodes of an electrostatic precipitator by reducing the voltage of the electrodes and shaking them, which is such that, in order to increase the efficiency and degree of gas purification, the voltage on the electrodes is reduced to a corona discharge quenching voltage and after shaking the voltage of the electrodes is increased to the operating value. Sources of information taken into account in the examination 1.Patent of Germany No. 1252636, cl. 12 e 5, 1968. 2. Japanese Patent No. 52-45949, cl. 72 C 54, 1977.