SU1763025A1 - Device for electric filter power feeding by alternating sign voltage - Google Patents

Abstract

The invention relates to electrical engineering, in particular to power sources of electrostatic precipitators that trap high-resistance dust, can be used in various industries and can increase the degree of dust collection by increasing the accuracy of maintaining a neutral charge in the layer of deposited dust. The electrostatic power supply device with alternating voltage contains, respectively, an appropriately rectifying bridge on diodes 2-5, a step-up transformer 6, a current sensor 7, an electron-beam valve 8, an output synchronizer driver 12, a thyristor control pulse generator 13, amplitude-phase converter 14, control signal generator 15, transient mode unit 16, spark discharge selector 17, reverse corona sensor 18, and corona current extraction unit 19. 2 Il. with s

Description

The invention relates to electrical engineering, in particular to power sources of electrostatic precipitators that trap high-resistance dust, and can be used in various industries.

The aim of the invention is to increase the degree of dust collection by improving the accuracy of maintaining the equality of positive and negative charges in the layer of deposited dust.

Figure 1 shows the block diagram of the device; Fig. 2 shows timing diagrams for the operation of the device, where Ui - U are the signals at the input and output of the differentiator, at the input of the switch, at the output of the spark selector, at the inputs and at the output of the difference amplifier, respectively.

The electrostatic power supply device with alternating voltage contains an electrostatic precipitator 1, a rectifying bridge on

diodes 2-5, step-up transformer 6, current sensor 7, electron-beam valve 8, output driver 9 pulses, control unit 10, voltage regulator 11, driver-synchronizer 12, driver thyristor control pulses 13, amplitude-phase converter 14 , driver 15, control signals, transient mode unit 16, spark discharge selector 17, reverse corona sensor 18, corona current extraction unit 19, rectifier 20, differential amplifier 21, first controlled switch 22, second controlled switch 23, differentiator 24 and Occupancy 25 voltage.

The electrostatic precipitator 1 is connected via a rectifying bridge on diodes 2-5 to one end of a high-voltage winding of a step-up transformer 6, the other end of which is connected via a current sensor 7 to a common

xj o CJ o ND 01

point scheme. The bridge diagonal includes an electron-beam valve 8, the anode of which is connected to the cathodes of diodes 2.4, the cathode is connected to the anodes of diodes 3.5, and the control electrode is connected to the output of the output pulse former 9, the input of which is connected to the output of the control unit 10. The low-voltage winding of the transformer 6 is connected via a thyristor voltage regulator 11 to the network input of the source, which is also connected to the inputs of the synchronizer 12, the outputs of which are connected to the first and second inputs of the control unit 10. The control inputs of the thyristor voltage regulator 11 are connected to the outputs of the thyristor control pulse generator 13, the input of which is connected to the output of the amplitude-phase converter 14. The first and second inputs of the amplitude-phase converter 14 are connected to the outputs of the generator 15 of the long-term control signals and the block 16 transitional regimes, respectively, whose inputs are connected to the output of the selector 17 spark discharges. The third input of the control unit 10 is connected to the output of the reverse corona sensor 18, which is connected to the precipitating electrode of the electrostatic precipitator 1. The corona current extraction unit 19 contains a rectifier 20, the output of which is connected to the fourth input of the control unit 10, and the input to the output of the differential amplifier 21, the first input of which is connected to the output of the first control key 22, and the second - with the output of the second control key 23. The input of the control key 22 is connected to the output of the differentiator 24, the input of which is connected to the first input of the spark selector 17 x bits and the output of the voltage sensor 25, which is connected between the collecting and discharge electrodes of the electrostatic precipitator 1. The input of the control key 23 is connected to the second input of the selector 17 of the spark bits and the output of the current sensor 7. The control inputs of the keys 22,23 are connected to the output selector 17 spark bits.

The device works as follows.

The control unit 10 generates the control pulses of the electron-beam valve 8 synchronized with the alternating voltage of the network, opening the valve 8 during only the positive half-wave of the supply voltage or during the negative half-wave. In the first case, a high-voltage winding of the transformer 6, a diode 2, an electron-beam valve 8, a diode 5 forms a positive constant voltage on an electrostatic precipitator, and in the second case a high-voltage winding of the transformer 6 anode 3, an electron-beam valve 8, a diode 4 - negative DC voltage. Switching the valve 8 to the formation of the alternating polarity of the output voltage is carried out according to the signal generated by the control unit 10. Initial

the magnitude of the current integral is fixed by a signal from the output of the reverse corona sensor 18. The total current signal removed from the current sensor 7, except for the working component (corona current), contains currents arising from breakdowns in the electrostatic precipitator, charge currents of the electrostatic precipitator capacity, polarization currents of the electrostatic precipitator when the polarity changes. The selection of the working component of the corona current from the total current flowing through the high voltage winding of the transformer 6 is performed by the corona current extraction unit 19 as follows. The input of the differentiator 24 receives the signal Ui

(see FIG. 2) from the output of the voltage sensor 25 on the electrostatic precipitator. A signal is removed from the differentiator output.

U2 - RC 1 - Nazareth,

where Ci is the capacity of the electrostatic precipitator 1;

R, C values of the active and reactive elements of the differentiator 24;

iaapcTTOK charging capacity of the electrostatic precipitator 1,

Thus, the signal U2 is proportional to the charging current of the capacitance of the electrostatic precipitator when the voltage is lifted on it and contains a component formed when the voltage decreases. To the input controlled

key 23 receives a signal from the output of the current sensor. The signal Us corresponds to the current flowing through the high voltage winding of the transformer 6. and consists of the corona current, the current arising from the spark

and arc breakdowns in the electrostatic precipitator, charge current of the electrostatic precipitator capacity, current recharging of the electrostatic precipitator capacity when the polarity is changed on it. The control inputs of the keys 22,23 receive a signal U4 with

output selector 17 spark bits. The signal U4 is formed with a sharp decrease in voltage on the electrostatic precipitator and at the same time a surge of current in the high-voltage winding of the transformer b, i.e. with spark

or arc discharge or recharging of an electrostatic precipitator. In the presence of a 1) l signal, the controlled keys 22,23 do not pass the signals 112,11z to the inputs of the differential amplifier 21, respectively. Thus, the controlled switch 22 to the input of the differential amplifier 21 receives the signal Us proportional to the charge current of the electrostatic precipitator, and through the control switch 23, the signal Ue is proportional to the sum of the currents of the corona discharge and the charging capacity of the electrostatic precipitator, and the output of the difference amplifier 21 removes the signal Uy, which characterizes only the current of the corona discharge, which, after the rectifier 20, is ready to control the unit m 10.

Improving the efficiency of dust collection is achieved by increasing the accuracy of maintaining a neutral charge in the layer of deposited dust, which is ensured as a result of an increase in the accuracy of measuring the corona current of the electric filter field.

Claims (1)

Invention Formula An electrostatic power supply device with alternating voltage, containing a high-voltage source with a thyristor regulator, connected via a rectifying bridge and an electron-beam valve to the electrostatic discharge corona electrode, a voltage sensor connected to the electrostatic precipitator, and a current sensor connected via an electric spark selector bits with the inputs of the transient mode unit and the shaper mode control signal generator, the outputs of which are connected via an amplitude-phase converter and a pulse shaper thyristor control with thyristor voltage regulator inputs, reverse corona sensor connected to precipitator electrode of electrostatic precipitator, driver-synchronizer, inputs of which are connected to a high-voltage source on the low voltage side, and outputs with the first and second inputs of the control unit, the third the input of which is connected to the return corona sensor, and the output through the output pulse shaper is connected to the control electrode of the switching element, characterized in that, in order to increase the degree of dust It is additionally equipped with a crown current extraction unit containing a differentiator, two controllable keys, a differential amplifier and a rectifier, with the input of the differentiator connected to the output of the voltage sensor and the output through the first control key - with the first input of the differential amplifier, the output of which is connected via a rectifier to the fourth input of the control unit, the second input of the differential amplifier is connected to the output of the second controlled the key, and the controlled key inputs are connected to the output of the spark selector 1P ri. BUT H / 7 UL Jl Jl-jl J FIG. Z