SU1126327A1 - Method of removing dust from electrostatic precipitator electrodes - Google Patents

Abstract

A METHOD FOR REMOVING ELECTROFILTER ELECTRODES BY ELECTROFILTER ELECTRODES BY EFFECT OF AN ELECTROMAGNETIC FIELD, THAT IS SIGNIFIED IN THAT, TO IMPROVE THE EFFICIENCY OF ELECTRODES, THE ELECTROMAGNETIC IMPACT IS IMPLEMENTED BY SUPPLYING A CURRENT OUTDIRECTION DIRECTION ONTO THE CONDUCTING BUS IN CONTACT WITH THE Crown-Discharge Electrodes With amplitude 1-5 kA and a duration of 3-6 ms. o O) C | 0 u m

Description

The invention relates to the technique of electrical gas cleaning and can be used in the mining, metallurgy, defense, food, cement and metallurgy industries for cleaning waste gases and aerosols. There is a known method of removing dust from electrodes of an electrostatic precipitator by imposing a variable electromagnetic field on them along the electrode f1. The disadvantage of this method is its inefficiency due to slight oscillations of the electrodes. The purpose of the invention is to increase the cleaning efficiency of corona and non corona electrodes from dust. This goal is achieved by the fact that, according to the method of removing pshi from electrodes of electrostatic precipitator, electromagnetic action is performed by applying a current pulse of opposite direction to a conductive busbar in contact with corona electrodes with an amplitude of 1 - 5 kA and a duration of 3 - 6 ms. FIG. 1 shows a device for carrying out the proposed method; in fig. 2 - looping tire. A high voltage is applied to the crown units of the electrostatic precipitator. The untreated gas stream is passed through the corona 1 and non-corona 2 electrodes. Corona 1 and non-corona 2 electrodes are rigidly interconnected by insulators 3. All non coronating electrodes 2 are interconnected by a looped bus 4, the two ends of which are connected to a thyristor control circuit 5, a battery of capacitors 6 and a power source 7. Method of cleaning corona t and non-corona 2 electrodes are as follows. applying high voltage to corona 1 and uncoronary 2 electrodes, in order to charge coagulation of the drunk particles in the gas stream, on the corona 1 and non corona 2 electrodes, a plash layer is formed, which reduces the ionization current (corona). In this case, the thyristor is triggered on the control circuit 5, skipping the entire charge of the capacitor bank 6 through a loop-shaped rigidly secured to the non-corona-2 electrodes bus 4. A current pulse with a duration of 3-6 ms and an amplitude of 7 across the loop-shaped bus 4, direct / electromagnetic field (fig. 2) directed towards each other. As a result of the counter-directionality of the vectors F and F2, the non-corona electrodes 2 and the corona electrodes 1 rigidly connected to them through the insulators 3 of the corona electrodes 1 are shaken. The duration and amplitude of the shaking are directly proportional to the duration and amplitude of the current pulse. The layer of fluff flies from the corona-discharge electrodes 1 and 2, and the current of the corona discharge increases to the nominal value. With a decrease in pulse duration of less than 3 µs, the pulse transmitted through the insulators to the corona electrodes attenuates and is not sufficient to separate the particles from the corona electrodes. To increase the pulse duration of more than 6 MKS, a significant increase in the capacitor bank is necessary, which reduces the reliability of the electrostatic precipitator. In the case of a decrease in the pulse amplitude of less than 1 kA, the magnitudes of the vectors F and Fj generated in the left (right) half of the loop-shaped tire decrease, which leads to a decrease in the shaking force. An increase in the pulse amplitude of more than 5 kA leads to a significant increase in the attractive force of the vectors F and F, up to the deformation of corona-discharge hard joints (Table 1). Table 1 The impact on the impact on the water conductor by the alternating conductor with a pulse prototype current according to the proposed method

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Short-time shaking of the sy-to maintain the corona (ionized corona discharge electrode) current in nominal values. Prose by passing through a loop-shaped, there is an increase in the efficiency of the work that is rigidly bonded to an electrofilter uncrowning. In addition, the current pulse to the bus bar allows the electrodes to blow dust from the corona and non corona electrodes and

five . Lagged method is simple to implement. Ina requires significant energy costs (Table 2).

table 2

Analysis of the experimental data given in Table. 1 shows that a pulse impact on a conductor is 5 to 14 times more effective than the impact on a conductor with an alternating current at an alternating frequency.50

An analysis of the comparative data of the experiment shows that the method of the prototype is not effective in operation, since incomplete cleaning of the corona gaps of the single electrodes reduces the corona discharge current from 1980 μA to 1990 μA, which leads to a decrease in efficiency from 95.8 dr 89.6%. In the proposed method, due to the complete cleaning of electrodes from dust, the efficiency and corona discharge current are stable.

Claims (1)

METHOD FOR REMOVING DUST FROM ELECTROFILTER ELECTRODES by exposure to an electromagnetic field, such that, in order to increase the cleaning efficiency of the electrodes, the electromagnetic effect is carried out by applying a counter current pulse to a current-carrying bus contacting with corona discharge electrodes with an amplitude of 1- 5 kA and a duration of 3-6 ms. Figure 1 .SU „., 1126327 1 ¹