SU1586781A1 - Apparatus for puised supply of electric precipitator - Google Patents

Abstract

The invention relates to the field of electrical gas cleaning, can be used in different areas of industry and allows to increase the reliability and simplify the device. The device for pulsed feeding of the electrostatic precipitator contains a high-voltage rectifier 1 connected through the first diode 7 to a circuit of series-connected reactor 2, a capacitor 3 and two switches 4,5. The latter are shunted by a divider 6 voltage. The secondary windings of transformers 8 and 9, which are shunted by diodes 10 and 11, are connected to the control inputs of switches 4 and 5. The primary windings of transformers 8 and 9 are switched in opposite and connected to the pulse generator 12. 1 il.

Description

The invention relates to the field of electrical gas cleaning and can be used for pulsed feeding of electrostatic precipitators in various industries.

The purpose of the invention is to increase the reliability and simplify the device.

The drawing shows a block diagram of the device.

Adjustable high-voltage two-phase single-phase rectifier 1 is connected to a series of series-connected reactor 2, capacitor 3 and two keys of ignitron arresters 4 and 5. The latter are bridged by voltage divider b and the first diode 7. Secondary are connected to control inputs of keys 4 and 5 windings of transformers 8 and 9, which are shunted by diodes 10 and 11. Diodes 10 and 11 can be connected in parallel with the primary windings. The primary windings of transformers are connected in series with each other and connected to the generator 12 pulses. Electrostatic precipitator 13 is connected to rectifier 1.

The device works as follows.

The rectifier 1 supplies a high voltage to the electrostatic precipitator 13. The voltage on the electrostatic precipitator is pulsating. At the moments of failure of this voltage, a synchronized generator of 12 pulses sends a start pulse to the keys 4 and 5. When they are started, under the action of the difference in voltage between the capacitor and electrostatic precipitator, a voltage pulse is formed on the latter. This impulse is formed due to the reactor 2 and the electrostatic precipitator capacity 13, which constitute an oscillating circuit. Under normal conditions of operation, the voltage on the electrostatic precipitator 13 is applied to the keys 4 and 5. A uniform voltage division between the keys 4 and 5 is achieved thanks to the voltage divider 6. In the electrostatic precipitator, sometimes sporadic breakdowns occur, during which almost all the voltage is applied to the keys 4 and 5 (reaching about 60 kV). With these voltages, the key should not work. Breakdowns usually occur (with a probability of more than 95%) on the falling part of the current of the rectifier 1, when the voltage on the electrostatic precipitator 13 is close to the maximum.

The keys 4 and BG have a low input resistance of the control circuit. The generator 12 is made in the form of a storage capacitor discharged through the key to the transformers 8 and 9. Due to the leakage inductance of the transformers, the primary winding inevitably becomes sinusoidal. The period of oscillation is 20-60 µs, the switch-on time of keys 4 and 5 is 1-2 µs, Thanks to the mentioned switching on of the windings of transformers 8 and 9, the first half-wave

current is supplied to one switch (for example 4). After this pulse has passed, the key remains in the conducting state for about 80 µs. When one key is started up, the circuit does not turn on, the second half-wave of the current enters the control circuit of the second key 5. It turns on and, since the first key 4 is not turned on, an additional impulse generation circuit is started.

5 Thus, the keys are launched with 4 and 5 different half-waves of the starting current. The windings of transformers 8 and 9, shunted by diodes 10 and 11, take them out of operation into different (opposite) half-cycles of control current oscillations. This circumstance reduces the required generator power of 12 pulses by 1.4-1.2 times. Reducing the power of the generator 12 simplifies the device,

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Claims (1)

Invention Formula A device for pulsed feeding of an electrostatic precipitator, containing an adjustable high-voltage, full-wave 0 single-phase rectifier, one output of which is connected to the ground bus and through the first diode - with a series connection of a capacitor and a reactor connected to another output of the rectifier, 5 the first key, the control input of which is shunted by a parallel connection of the second diode and the secondary winding of the first pulse transformer, and a pulse generator connected by one 0 output with the primary winding of the first pulse transformer, characterized by the fact that, in order to increase the reliability and simplify the device, it additionally contains a second switch, a voltage suppressor, a second pulse transformer and a third diode, while the voltage divider connected between the point of connection of the first diode with a capacitor and the ground bus, the first and second keys 0 are connected in series with each other and in parallel to a voltage divider, a control input of the second switch through a parallel connection of the secondary winding of the second pulse transformer, and 55 of the third diode is connected to the output of the voltage divider, and the primary winding of the atopo pulse transformer is switched on opposite to the primary winding of the first pulse transformer and connected to another output of the pulse generator,