SOURCE OF ALTERNATING VOLTAGE FOR GAS-CLEANING ELECTROFILTERS.

摘要

A source of alternating voltage for gas-cleaning electrofilters provided with means (2) for shaking the electrodes comprises a step-up transformer (10), the primary winding (9) of which is connected, through a thyristor-type voltage regulator (5), to a source of alternating voltage (6), an alternating voltage generator (12), the input of which is connected to the secondary winding (11) of the step-up transformer (10), whereas the output is connected to the corona electrode (4) of the electrofilter (1). To the secondary winding (11) of the step-up transformer (10) is connected a current detector (18) connected to the receiving electrode (3) of the electrofilter (1). To the output of the current detector (18) is connected the input of a control unit (20), the outputs of which are connected to the inputs of the thyristor-type voltage regulator (5) and the alternating voltage generator (12). To the corona and receiving electrodes (3, 4) of the electrofilter (1) is connected a voltage detector (24) in the form of a voltage divider, the output of which is connected to the control unit (20). The source further comprises a unit (25) for dividing the input signal into signals of opposite polarity, the input of which is connected to the voltage detector (24), integrators (31, 32), whose inputs are connected to the corresponding outputs of the unit (25), switching elements (35, 36), the outputs of each of which are connected in parralel to each of the integrators (31, 32), threshold elements (37, 38), whose inputs are connected to the outputs of the integrators (31, 32) and whose outputs are connected to the control unit (20), an ''OR'' logic element (39) the inputs of which are connected to the outputs of the threshold elements (37, 38), and an executing element (40), the input of which is connected to the output of the ''OR'' logic element (39), whereas the output is connected to the means (2) for shaking the electrodes of the electrofilter (1).