SU1268207A1 - Versions of power supply unit for electric precipitator - Google Patents

Abstract

The invention relates to a device for powering an electrostatic precipitator, can be used in the chemical industry and improves the degree of gas purification. The device contains a transformer (T) 1, one winding of which through a series-connected diode bridge (M) 4, the reactor 5 is connected to an electrostatic precipitator 6. Another winding T 1 is connected through the signal unit 2 to the control unit 3. Between the poles of M 4, capacitors 7.8 and diodes 9.10 are connected in series. Counter-parallel last included key 11, connected by its input to the generator 12 pulses (the first option). Between the poles M 4 (the second option) there are two chains made up of capacitors 7 i and 8, diodes 9 and 10, and resistors 11 and (L 12. The terminals of the capacitors are connected by means of a key 13 connected C to the pulse generator 14. In parallel with the key 13, a diode 15 is turned on 15. 3 cf f-ly. 5 ill. Tsd a 00 th

Description

The invention relates to the electrical cleaning of gases, in particular to the powering of electrostatic precipitators by high voltage.

The aim of the invention is to increase the degree of purification of gases.

FIG. 1 shows a diagram of the first variant of the device; in fig. 2 is a diagram of a second embodiment of the device; in fig. 3 - diagrams of operation of the device according to the first and second options; in fig. 4 is a diagram of the third embodiment of the device; in fig. 5 - diagram of the operation of the device according to the third option.

Transformer 1 through a triac 2, equipped with a control unit 3, is connected to the network. To the secondary winding of the transformer is connected a diode MOS 4, the output of which through the reactor 5 is connected to the electrostatic precipitator 6.

FIG. 1, between the poles of the bridge 4, two capacitors 7 and 8 and diodes 9 and 10 are connected in series. The middle point of the diodes is connected to the output g (or tap) of the transformer 1. Counter-parallel to the diodes 9 and 10 included the key 11, the input of which is connected to the generator 12 pulses.

FIG. 2 between the poles of the bridge there are two chains made up of capacitors 7 and 8, diodes 9 and 10 and 1 of the resistors -11 and 12, respectively. The capacitor terminals are interconnected via a switch 13, the control output of which is connected to the pulse generator 14, and a diode 15 is connected in parallel with the switch 13.

The device works as follows.

The triac 2 controls the voltage of the transformer 1 using a control unit. The voltage after rectification by bridge 4 through the reactor 5 is supplied to the corona electrode of the electrostatic precipitator 6, in which the gas is removed from the voltage. Thanks to bridge 4, a constant voltage component is created on the electrostatic precipitator 6.

The capacitors 7 and 8 in this circuit are each charged up to the voltage amplitude at the output of bridge 4. If the common output of diodes 9 is connected to the tap-off of the transformer secondary winding, then this voltage is slightly lower.

The pulse generator 12 periodically with a frequency of 25-100 Hz supplies 11 pulses of control to the key. When the switch 11 is turned on, the total voltage of the capacitors 7 and 8 is applied to the oscillatory circuit. The reactor 5 is an electrostatic precipitator 6. The oscillatory process causes a voltage pulse on the electrostatic precipitator 6 with a duration

20-150 ISS. FIG. 3 shows the form of the voltage.

Similarly, the scheme of FIG. 2 works. At the same time, resistors 11 and 12 provide current limiting through diodes 9

and 10 when charging capacitors and exclude shorting of bridge 4 when the control key 13 is turned on. The resistance of these resistors is assumed to be in the order of 50 kΩ or more.

FIG. 4, the poles of the bridge 4 are connected to a circuit made up of a capacitor 7 and an antiparallel diode 8 and a switch 9, to the control input of which is connected a generator 10 synchronized with the network.

As in the previous scheme in this scheme, the reactor 5 is connected in series with the capacitor 7. The capacitor 7 is charged to the amplitude of the voltage Vf. The generator 10 is synchronized with the network and generates control pulses of 50 or 100 Hz with a phase angle of the order of

40-60. As studies of the modes of electrostatic precipitators and power units show, the minimum voltage V,.,; on electrostatic precipitator 6. At these times, switch 9 is turned on. Due to the difference in voltage between the capacitor 7 and electrostatic precipitator 6, the oscillating circuit generates an impulse of an angle on the electrostatic precipitator of V, V + 2 (Vd - V) (Fig. 5).

The proposed schemes provide power to the electrostatic precipitator simultaneously with pulsed and constant voltage, which ensures high efficiency of the electrostatic filter. Constant voltage is most effective for dusts with low electrical resistivity (resistivity) (Kuznetsk ash, Donetsk coal).

Impulse voltage is most effective at dust with large resistivity (ash of Ekibastuz coal at 100-150 ° С).

Claims (3)

1. A device for the lithograph of an electrostatic precipitator containing a high-voltage transformer, to the secondary winding of which a diode bridge is connected, the output of which through a reactor is connected to a corona electrode, a controllable switch with a generator, a diode and a capacitor, characterized in that, p. The purpose of the efficiency of the electrostatic precipitator is that it additionally contains an IDIOD capacitor, with both diodes connected in series and connected across capacitors through the bridge, the control key is connected anti-parallel through both diodes and the anode of the first diode and the cathode of the second are connected to a transformer. 2. Device for powering the electrostatic precipitator, containing a high-voltage transformer, to the secondary winding of which a diode bridge is connected, the output of which through a reactor is connected to a corona electrode, a controllable switch with a generator, a diode and a capacitor differing from 262074 so that, in order to increase the efficiency of the electrostatic precipitator, it additionally contains two diodes, one capacitor and two resistors 5, the first diode is connected through two capacitors parallel to the bridge, and chains of series-connected resistors and diodes are connected to the anode and cathode of this diode , 10 connected to the cathode and the anode of the bridge, the control key is connected. opposite the first diode. 3. A device for feeding an electrostatic precipitator containing a high-voltage 5 a transformer, to the counter winding of which a diode bridge is connected, the output of which through a reactor is connected to a corona-forming electrode, controls a switch with a generator, a diode and a capacitor, which, in order to improve the performance of the electrostatic precipitator, a series-connected diode and capacitor are connected parallel to the motor, the controlled key is connected in parallel to the diode, and the generator is connected to the primary winding of the high-voltage transformer.