RU1798003C - Power source for electric filter - Google Patents

Abstract

Using; area of electric gas purification. The inventive device comprises serially connected thyristor converter 1, transformer 2, diode bridge 3, second thyristor converter 4, transformer 5, diode bridge 6, reactor 7, capacitor 8, shunt 9, key 10, generator 11, amplitude filter 12. regulator torus 13, set-point block 14, threshold element 17 and circuit I 18. 1 ill.

Description

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The invention relates to the field of electrical engineering, in particular to the electrical purification of gases.

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

The drawing shows a block diagram of a device.

It contains a series-connected first thyristor converter 1, a transformer 2, a diode bridge 3, a series-connected second thyristor converter 4, a transformer 5, a diode bridge 6, a reactor 7 and a capacitor 8. A circuit consisting of a shunt is connected in parallel with the bridge b. 9 and a key 10 provided with a generator 11. The output of the shunt 9 is connected to the converter 4 through a series-connected amplitude filter 12 and a regulator 13, to the second input of which an installation unit 14 is connected. An electrostatic precipitator 15 is connected to the output of the bridge 3. A voltage divider 16 is connected by an input to the electrostatic precipitator 15. and an output to a threshold element 17, which is connected by an output to the I-18 circuit. the second input connected to the output of the generator 11.

A device for feeding an electrostatic precipitator operates as follows.

The thyristor converter 1 controls the voltage on the primary winding of the transformer 2. This voltage rises and after rectification by the bridge 3 is supplied to the power of the electrostatic precipitator 15. The voltage of the converter 1 is automatically or manually adjusted. The voltage on the electrostatic precipitator along with the constant contains a variable frequency of 100 Hz. which, depending on the state, varies from 2 to 25%.

The capacitor 8 is charged to the amplitude value of the voltage of the bridge 3 plus the voltage at the output of the bridge 10. The converters 1 and 4 are powered mainly from the same phases of the network. At the moment when the mains voltage goes through zero, the generator 11 turns on the key 10. As a result, a voltage pulse is generated on the electrostatic precipitator. This pulse is generated due to the oscillation of the circuit, consisting of a capacitor 8 and a reactor 7. A signal proportional to the current of this pulse is measured by shunt 9. At the output of the amplitude filter 12 there is a constant signal, which is compared with the signal

scrap unit 14 settings. Based on the results of this comparison, the controller 1.3 sets the control signal of the converter 4 so as to stabilize the pulse component of the voltage. Oscillations of this component without the aforementioned regulator are possible due to a change in the ripple of the voltage of the bridge 3, due to a change in the output voltage and the resistance of the electrostatic precipitator.

Divider 16 measures the voltage value. The threshold element 17 during normal operation of the electrostatic precipitator 15 is in the on state and does not prevent the passage of pulses from the generator 11 to the key 10. At low voltages (below 15-20 kV) arising from breakdowns and short circuits in the electrostatic precipitator , the threshold element 17 is disabled and pulses do not pass through the I-.18 circuit. This eliminates the overload of the key 10 and eliminates erroneous information of the introduced new control loop.

Claims (1)

SUMMARY OF THE INVENTION An apparatus for powering an electrostatic precipitator, comprising first and second thyristor converters, transformers and diode bridges respectively connected to a grounded cathode, a key, an anode connected to the cathode of the second diode bridge and a first reactor terminal, a pulse generator and a capacitor connected to the first terminal to the second output of the reactor, and the second with the anode of the first diode bridge, which is the output of the device, characterized in that, in order to increase the degree of gas purification and increase the reliability of the device, it additionally contains a setpoint unit, a shunt, an amplitude filter, a regulator, a voltage divider, a threshold element and AND circuit, while the shunt is grounded with one output and connected to the key cathode and to the inputs of the amplitude filter with the other, the controller inputs are connected respectively, with the outputs of the setpoint unit and the amplitude filter, and its output is connected to the control input of the second thyristor converter, the input of the voltage divider is connected to the second output of the capacitor, and its output is connected through a threshold element with the first input of the AND circuit, the second input of which is connected to the output of the pulse generator, and the output is connected to the control input of the key.