SU1669561A1 - Device for electrical filter power supplying - Google Patents

Abstract

The invention relates to the electrical cleaning of gases, can be used in various fields of industry. The goal is to increase the reliability and degree of gas purification. The device for powering the electrostatic precipitator contains connected in series an amplitude-phase converter 1, a controlled rectifier 2 and a voltage divider 3, a selector 4 of breakdowns connected by its output with a reset input of the integrator 5 and the first input of an amplitude-phase converter 1, series-connected delay unit 6 , one-shot 7, circuit OR 8, memory block 9 and maximum selection block 10, its input connected to the second input of the amplitude-phase converter 1, and the second input to the output of the integrator 5, analogs the input of the memory block 9 and the first input of the zero-body 12, the input of the delay block 6 and the second input of the OR circuit 8 are connected to the output of the breakdown selector 4, the input of which is connected via key 11 to the analog input of integrator 5, the control input of key 11 is connected to output null organ 12, and the output of memory block 9 is connected to the second input of null organ 12. 1 Il.

Description

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The invention relates to electrical cleaning of flue gases and can be used in various industries.

The purpose of the invention is to increase the reliability and degree of gas purification.

The drawing shows a block diagram of a device for feeding an electrostatic precipitator.

The device contains an amplitude-phase converter 1 connected in series, a controlled rectifier 2, a voltage divider 3, a breakdown selector 4, an integrator 5. The output of the selector 4 is also connected to a serial circuit formed by a delay unit 6, a single-oscillator 7, an OR 8 circuit. , memory block 9, maximum selection block 10, a second input connected to the integrator 5, which contains a key 11 at the input, connected by a control input to the zero-body output 12. The last input is connected to the outputs of the integrator 5 and memory block 9. K out y rectifier 2 connected to an electrostatic precipitator 13.

The device works as follows.

In the electrostatic precipitator 13, the flowing gases are cleaned under the action of a high regulated voltage coming from rectifier 2. The integrator 5 gradually increases the voltage level. When breakdown occurs, the selector 4 operates, which dramatically increases the control angle of the rectifier 2, affecting the amplitude-phase converter 1. At the same time, the selector 4 changes the integrator voltage (resets it) by a value proportional to the breakdown time. After the end of the breakdown, the level of the output voltage of the rectifier is determined by the integrator 5. During short-term (spark) breakdowns, the block b delay does not work. The response time of delay unit 6 is set in the order of 8-10 ms.

In case of arc breakdowns in the electrostatic precipitator and equipment overlaps, the duration of the voltage reduction exceeds the response time of the delayed response unit 6, it operates and starts the one-shot 7 with a time of 1 to 5 minutes. At the same time, at the beginning of the sampling, the memory block 9 is transferred from the tracking mode to the sampling mode, i.e. in the mode of issuing a signal. The same mode at the time of 1-5 minutes sets and one-shot 7.

Block 9 has a slightly smaller output signal in absolute value (by 3-5%) of the signal of the integrator 5 before the arc one

breakdown (signals have a negative sign). At the same time, the key 11 is turned off, and the integrator 5 switches to the signal storage mode (hangs). Key 11 is disabled by null-body 12 when comparing signals

integrator 5 and memory block 9. The selection unit 10 sets the maximum voltage at the output of the rectifier 2 slightly lower than before the arcing breakdown. This state remains unchanged throughout the operation of the single vibrator 7. As a result, the rectifier operates in a quiet, arc-free mode.

Claims (1)

Apparatus of the Invention A device for powering an electrostatic precipitator, comprising an amplitude-phase converter connected in series, a controlled rectifier, a breakdown selector and a voltage divider connected by its output the reset input of the integrator and the first input of the amplitude-phase converter, characterized in that, in order to increase the reliability and degree of gas purification, it additionally contains zero-organ, key and series-connected delay unit, one-shot, OR circuit, memory block and maximum selection block; the maximum selection block is connected to the second amplitude-phase input by its output the converter, and the second input - with the integrator output, the analog input of the memory unit and the first input of the null organ, the input of the delay unit and the second input of the OR circuit connected to the output of the breakdown selector, whose input is connected via a key to the analogue input of the integrator, the control input of the key is connected to the output of the null organ, and the output of the memory unit to the second input null organ.