SU1579567A1 - Apparatus for power supply of electric precipitators - Google Patents

Abstract

The invention relates to power sources of electrostatic precipitators that trap high-resistance dust, can be used in various industries and can increase the degree of gas purification by increasing the average voltage value on the electrostatic precipitator. SUMMARY OF THE INVENTION: The device further comprises a sample signal correction unit, the first input of which is connected to the output of the spark selector, the second to the output of the current sensor, the third to the first output of the control unit, and the output to the inputs of the transient mode unit and control signal generator long mode. 3 il.

Description

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a transformer 6 with a thyristor regulator 8 in the primary circuit connected to the electrostatic precipitator 1 through two oppositely connected chains, each of which consists of a first valve 2 and a first switch 4, a second valve 3 and a second switch 5, the current sensor 7, connected in series, respectively, 14 spark gaps connected to the first input of the selector, voltage sensor 16 connected to the electrostatic precipitator 1 and connected to the second input of the selector 14 spark discharges, transient mode unit 11 and driver 12 controls long-duration signals, the outputs of which through the amplitude-phase converter 10 and the driver of the thyristor control pulses 9 are connected to the inputs of the thyristor controller 8, the control unit 15, the first and second outputs of which are connected to the inputs of the first 4, respectively, output pulses 17, 18 and the second 5 switches, and a block 13 signal correction unit, the first input of which is connected to the output of the selector 14 of the spark bits, the second to the output of the current sensor 7, the third to the first output of the control unit 15, and The output of the correction unit 13 is connected to the inputs of the transient mode unit 11 and the formatter 12 of the long-term control signals. 2 Il.

The invention relates to food sources of electrostatic precipitators that trap high-impedance dust, and can be used in various industries.

The aim of the invention is to increase the degree of gas purification by increasing the average value of the voltage on the electrostatic precipitator.

FIG. 1 is a block diagram of an electrostatic precipitator power supply device with alternating voltage; in fig. 2 - electrical circuit diagram of the sample signal correction block.

The electrostatic precipitator 1 (Fig. 1) is connected through chains from diodes 2 and 3 and switches 4 and 5 to the ungrounded output of the high-voltage winding of the upstream transformer 6. Another output of the high-voltage winding of the transformer b is connected through the current sensor 7 to the common point of the Circuit, and the low-voltage winding through the type A fast switch 8 is connected to a circuit. The control inputs of the thyristor controller 8 are connected via the driver of the thyristor control pulses 9 to the amplitude-phase converter 10, the first input of which is connected to the output of the transient mode unit 11, and the second to the output of the continuous-mode control signals 12. The inputs of the transient mode unit 1 and the continuous control mode generator 12 are connected to the output of the sample signal correction unit 13, the first input of which is connected to the output of the selector 14 spark bits, the second to the output of current sensor 7, and the third to the first output of block 15 / board 14 spark selector inputs

The bits are connected: the first to the output of current sensor 7, and the second to the output of voltage sensor 16 on an electrostatic precipitator. The first, second and second outputs of the control unit 15 are connected: through the output drivers 17 and 18 of the control pulses of the switches with the control inputs of the switches l and 5, respectively,

Block 13 correction signal breakdown (FIG.

2) contains a differentiating device 19, the input of which is connected to the first output of the control unit 15, and the output - to the S-input of the trigger 20, the R-input of which is connected to the output of the imager 21. The input of the imager 21 is connected to the output of the juice sensor 7, and the direct output trigger 20 is connected to a prohibiting input of prohibition circuit 22, the other input of which is connected to the output

the selector 14 of the spark bits, and the output with the input of the block 11 of the transient mode and the driver 12 of the control signals of the long mode.

The device works as follows.

The control unit 15 generates control pulses of the switches 4 and 5 operating in antiphase. Block 15 contains a master oscillator that generates short voltage pulses of an adjustable frequency within 0.02-50 Hz, and a driver for the duty cycle of voltage pulses of a trigger type. The voltage pulses generated by the control unit 15 have the following parameters: the sequence frequency f 0.01 ± 10 Hz, the duty cycle Q 2-3. Thus, the control unit 15 sets the switching mode of alternating voltage on the electrostatic precipitator in frequency and duty cycle, which are set manually, based on the physicochemical properties of the dust being cleaned and the technological parameters of the electrostatic precipitator. The output pulses from the Control Unit 15 are supplied to the form controllers 17 and 18 of the control pulses of the switches 4 and 5, providing the supply to the control inputs of the switches of rectangular voltage pulses of a given magnitude. When switched on by a command from the control unit 15 of the switch A as a result of charging the capacity of the electrostatic precipitator along the circuit: high voltage winding of the transformer b — diode 2 – switch 4, a positive polarity is formed on the electrostatic precipitator. When the switch 5 is turned on along the circuit: the high-voltage winding of the transformer 6 is diode 3 is switch 5, a negative polarity voltage is formed on the electrostatic precipitator.

Pre-breakdown voltage is maintained on an electrostatic precipitator for a positive and negative half-wave of alternating voltage in a known manner, for example, when an automatic voltage regulator is operating, similar to an ORT-type regulator. This is done as follows. When voltage is applied to the electrostatic precipitator 1 in its active zone, systematic yutiskra discharges occur, which are accompanied by a sharp decrease in the voltage on the electrostatic precipitator and current surge. A change in the polarity of the voltage on the electrostatic precipitator is also accompanied by a current surge and a voltage transition on the electrostatic precipitator through a zero level. Voltage decay signals arrive at the corresponding inputs of the selector 14 of the spark discharges, at the output of which a signal is formed which fixes the inrush of current in the circuit with a sharp decrease in the voltage on the electrostatic precipitator to zero. Thus, the selector 14 of the spark discharges, when the polarity of the voltage across the electrostatic precipitator changes, generates a false spark discharge signal in the electrostatic space of the electrostatic precipitator. The signal from the output of the selector 14 is fed to the input of the block 13 for correcting the signal of the sample, the output of which generates a signal corresponding to a true spark discharge in the electrostatic precipitator. It acts on the transient mode unit 11 and the continuous mode control signal driver 12, the output signals of which are fed to the amplitude-phase converter 10 and generate voltage pulses determining the unlocking time of the thyristor of the regulator 8.

The correction of the signal breakdown is carried out as follows. The input of the differentiating device 19 receives a rectangular signal from the output of block 15

control The signal of our output corresponds to the point in time when a pulse arrives ne change in polarity of the voltage on the electrostatic precipitator. Next, the signal enters the S-input of the trigger 20, the output

0 which generates a signal that indicates that the polarity of the voltage on the electrostatic precipitator is changing. In this case, the shaper 21 captures the inrush current and generates a signal at the output that corresponds to the end of the inrush current. It arrives at the R input of the trigger 20, at the output of which it sets a zero state. Thus, the signal at the output of the trigger 20 determines the switching time of the voltage

0 on the electrostatic precipitator. The signal arrives at one of the inputs of the prohibition circuit 22, to the other input of which a signal is output from the selector output 14 of the spark bits. If they coincide in time, then the output of the circuit

5 22 no signal is generated, i.e. false spark test signals are excluded. In this case, there is no unreasonable decrease in the voltage on the electrostatic precipitator, therefore, the average value increases.

0 voltages, i.e. gas cleaning efficiency is improved.

Claims (1)

The invention The device for feeding an electrostatic precipitator with alternating voltage, containing a high-voltage source with a thyristor regulator in the primary circuit, connected to an electric filter through two parallel-connected circuits, each of which consists of successively connected, respectively, of the first valve and the first switch, the second valve and a second switch, a current sensor and a voltage sensor connected to an electrostatic precipitator, connected 5, respectively, with the first and second inputs of the spark selector, the transient mode unit and the long term control signal generator, the outputs of which are connected through the amplitude-phase converter and the thyristor control pulse driver with the thyristor control. torus, and the inputs of the first and second switches are connected via output drivers 5 pulses, respectively, with the first and second outputs of the control unit, characterized in that, in order to increase the degree of gas purification by increasing the average value of the operating voltage when switching polarity, it additionally contains a block signal correction unit, the first input of which is connected to the output of the spark selector, the second to the output of the current sensor, the third to the first From the exit toloka15 control From the output of the Tpoke peak from the output of the spark arrester selector II the output of the control unit, and the output with the inputs of the transient mode unit and the driver of the long-term control signals. Nakhodki blok6 n 11