SU1190476A1 - Pulse generator for supplying alternating voltage to electrostatic precipitator - Google Patents

Abstract

PULSE POWER GENERATOR FOR ELECTROFILTER BY VARIABLE VOLTAGE, containing a high-voltage rectifier, the positive pole of which is connected to the total thickness and the first output of the electrostatic precipitator, and the negative pole with the first output of the first key, the second key, the control unit, the first and second outputs of the electrostatic filter, and the negative pole with the first output of the first key the inputs of the first and second keys, respectively, characterized in that, in order to increase reliability, a throttle is inserted into it, the second output of the first key being connected via a second key to the common its thickness, and through the choke - with the second output of the electrostatic precipitator.

Description

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This invention relates to electrical gas cleaning.

The purpose of the invention is to simplify the device by reducing the number of high voltage rectifiers and increasing reliability.

FIG. Figure 1 shows a pulse generator for powering an electrostatic precipitator by alternating voltage; in fig. 2 is a voltage chart on an electrostatic precipitator.

The pulse generator for supplying the electrostatic precipitator with alternating voltage contains a high-voltage rectifier 1, the first switch 2, the second switch 3, the control unit 4, the choke 5 and the electrostatic precipitator 6.

The positive pole of the high-voltage rectifier 1 is connected to the common bus and the output of the electrostatic precipitator 6, and its negative pole is connected to another output of the electrostatic precipitator 6 through the first switch 2 and the choke 5 connected in series. The combined leads of the first switch 2 and throttle 5 are connected to the common bus through the second switch 3. The outputs of the control unit 4 are connected to the control inputs of the first and second keys.

The pulse generator for feeding the electrostatic precipitator with alternating voltage operates as follows.

Periodically at the instants of time preceding the instant tj, control unit 4 removes control pulses from key 2. This advance lies in the range of 0.2–10 ms. During this time, key 2 is closed, and at time tj, control unit 4 sends a signal to turn on key 3.

The electrostatic precipitator 6, which has a parasitic capacitance, together with the choke 5 obs form an oscillating circuit. For half a period of oscillation through the key 3 flows a half-wave of current. In this case, the polarity of the voltage on the electrostatic precipitator changes to the opposite, remaining at a level that decreases with time. This reduction is due to leakage currents. At time t, key 3 is turned off and a control signal is given to key 2. As a result, the voltage on the electrostatic precipitator 6 acquires a normal 5 (negative) polarity.

When the rectifier is controlled, the rectifier itself can play the role of key 2.

The keys 2 and 3 can be any, made on mechanical switches, 0 electronic gates, thyristors, etc.

The key management unit may be executed according to one of the known schemes.

The switching frequency is selected based on the operating conditions of the electrostatic precipitator. She 5 lies in the range of 0.1 -10 Hz. The duration of the positive voltage pulse tx-t is on the order of 0.01-0.5 s.

Thus, the device provides power for the electrostatic precipitator with the opposite voltage. It does not require a second bulky source of alternating voltage, which greatly simplifies the design of the device.

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Claims (1)

PULSE ELECTRIC FILTER GENERATOR WITH VARIABLE VOLTAGE, containing a high-voltage rectifier, the positive pole of which is connected to a common bus and the first output of the electrostatic precipitator, and the negative pole is connected to the first output of the first key, the second key, the control unit, the first and second outputs of which are connected to the control inputs and the second key, respectively, characterized in that, in order to increase reliability, a throttle is introduced into it, and the second output of the first key through the second key is connected to a common oh, and via a throttle - to the second terminal of the electrostatic precipitator. FIG. 1>