SU575629A1 - Electric filter power supply - Google Patents

Description

one

Apparatus for supplying electrostatic precipitators with pulsed voltage are known. In these devices, a primary accumulation of electrical energy from a low voltage source of direct current in a capacitor is created, and then the discharge of this energy through an inductor and a pulse transformer and a diode in an electrostatic precipitator. The disadvantage of these devices is the difficulty in realizing a voltage pulse with sufficiently small fronts.

A high voltage switch on a capacitive load is also known, which contains two switches, one of which is connected in series and the other in parallel with the load fsj. Such a scheme allows obtaining sufficiently small voltage pulse fronts, but has a reduced reliability of having two controllable keys.

It is also known a device for charging a storage capacitor comprising a constant voltage source connected via a choke and a thyristor switch to the storage capacitor f4j. Significant

The disadvantage of this device when using it for powering electrostatic precipitators lies in the impossibility of obtaining a pulsating voltage on an electrostatic precipitator with a short length of the falling edge of a voltage pulse and in this connection it is impossible to ensure a high degree of gas purification by electrostatic precipitators.

The aim of the invention is to increase the degree of gas purification by the electrostatic precipitator by improving the voltage shape of the electrostatic precipitator.

The goal is achieved by parallel to the sparking key, which together with the storage capacitor connected to the high voltage source of constant voltage, resistance, choke and electrostatic precipitator, is connected to a series circuit.

The drawing shows a diagram of the device.

Claims (3)

The device contains a high-voltage step-up transformer 1, rectifier 2, resistance 3s shotseller 4, switch key S, electrostatic precipitator B, measuring op gpn 7, high voltage divider 8, thyristor key control unit 9 5, storage capacity 12, connected in parallel with the rectifier 2. When the thyristor switch 5 is turned on in the system, the storage capacitor 12 is an electrostatic precipitator b, an oscillatory transient occurs. At the same time, due to the presence of a sequential 1 C-circuit (10.11, a current in the form of a complete sinusoidal oscillation flows through the electrostatic precipitator 6), and a voltage pulse on the electrostatic precipitator 6 has a leading edge duration equal to the length of the forward half-wave current the duration of the reverse half-wave current. Since the amplitude is reverse-D, the half-wave is less than the amplitude of the direct half-wave current, a pulsating voltage with some constant component is created on the electrostatic precipitator 6. If the corresponding half-C-circuit parameters (10, 11) can be approximated to zero, then the trailing edge of the aperture pulse has an exponential character with a constant time, determined by the main power of the corona discharge of the electrofilter 6. The invention The device for powering electrostatic precipitators, containing a source of direct voltage with a storage capacitor connected cherbz choke and thyristor key to the load circuit, characterized in that, in order to increase the degree of purification The call, parallel to the key, is connected a serial LCC circuit. Sources of information taken into account in the examination: 1, US Patent No. 2509548, cl. 55-139, 1948. 2 g. US Patent. A 2782867, cl. 55-139, 1948, 3. US patent number 3659190, 323/22, 1972. 4, Copyright certificate number 274159, cl. H 03 K 3/57, 1969.