SU1220094A1 - Device for supplying power to electrostatic precipitator - Google Patents

Abstract

The invention relates to the field of electrical gas cleaning and can be used to supply electrofilters with reverse voltage. The purpose of the invention is to increase the reliability and degree of gas purification. The device contains a high voltage source (IVN), made on the transformer 1, sequentially in the primary winding circuit of which a regulating triac 2 is connected. A rectifying bridge 3 is connected to the secondary winding of the transformer 1. The positive IVR output terminal is connected to the electrostatic precipitator 5. The negative output IVN through the reactor 4 is connected to the second output terminal. A control key 6 connected in parallel with the generator 7 is connected in parallel with the output of the IVN. , exclude overgrowing of electrodes of electrostatic precipitator with dust, exclude breaks of corona electrodes. This ensures the reliability and degree of gas purification. 3 il. V kn HCH I I I I

Description

The invention relates to the electrical purification of gases and can be used to supply electrostatic precipitators with reverse voltage.

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

Figures 1 and 2 are diagrams of the device; in fig. 3 - diagrams of currents and voltages on the circuit elements.

The device (Fig. 1) contains a high voltage source made up of transformer 1, the primary winding of which is connected to the industrial network through regulating triac 2, and the secondary winding of transformer is connected to the input of the rapid bridge 3, positive output of the rectifier 3 ( source) is grounded, and the negative output is connected to the reactor 4, which is connected to the second output and to the output output to connect the electrostatic precipitator 5, and the counter-parallel rectifier 3 is switched on. A control key 6 whose input is connected to the generator rum 7. The driver of the triac 2 is connected to the control unit 8.

The DC voltage source circuit may be different, for example, made in the form of a mechanical rectifier.

The operation of the device is illustrated by diagrams (Fig. 3), where Uj is a conditionally rectified rectifier voltage with full opening of the triac 2 and with an active load, U is the voltage on the electrostatic precipitator 5; 1 and I, - currents of the electrostatic precipitator 5 and rectifier 3.

 The device works as follows

The primary voltage of the transformer 1 is adjusted at the required level by a well-known triac 2 using block 8. After the voltage is raised, the voltage is rectified by sniper 3 and fed to the electrostatic precipitator 5, where the gas is cleaned from the dust particles by deposition on the electrodes filter.

The electrostatic precipitator, as an electrical load, is a nonlinear active-capacitive link with a capacitance of 0.04–0.2 μF. Therefore, the current consumed by it from the rectifier is of a finite nature, long.

and, the voltage Uj contains pulsations in the order of 10-30%.

Switching on the key 6 with the pulse of the generator 7 is periodically carried out with a frequency of about 0.5-10 Hz at times tj. The key 6 short-circuits the capacitance of the electrostatic precipitator 5 by inductance. The oscillatory circuit formed by the indicated elements

10 enters the work. During the oscillation, the voltage on the electrostatic precipitator 5 briefly changes sign and then recovers. The period of natural oscillations of the circuit is chosen in the order of 15 rows of T 60–1000 µs, which was established experimentally by the nature of the effect of this magnitude on the electrostatic precipitator. At that, the smaller value of specific electrical resistance of the slit corresponds to smaller values. The selection of this value, as well as the frequency, is carried out experimentally for this type of dust. A layer of zili deposited on the electrodes

25 due to high resistance

 Ohm M has a potential different from that of the electrode. Under the action of the difference of these potentials, the dust layer is compressed.

thirty

With a periodic change of polarity between the electrode and the layer, electrodynamic and electrostatic forces of thaw-like character take place. These forces weaken the hesius with a lump, which makes it easier to shake them when they are struck on the electrodes by the shaking mechanism. In some cases (at relatively low), the collapse of a layer of dust can occur independently under the action of weight and electrodynamic forces (startle).

The destructive, anti-adhesive forces acting on the layer of the fluff are proportional to the rate of change of voltage during its reverse. From this point of view, the linear (triangular) law of variation and voltage is most appropriate, in which the modulus

5, the derivative of the voltage is constant, and therefore the greatest, impulse of force is reached.

on the other hand, this form of voltage ensures low consumption of the module of the average voltage (volt-second square).

This device provides a cosine shape for the duration of 40

45

nor with its reverse. Such a shape is slightly different from a triangular shape. The loss of the volt-second square of the voltage of the cosine-shaped form is even better. So with a triangular shape S 0.5 UT and with a cosine S 0.36 UT, where and is the voltage across the electric motor when the key 6 is turned on.

Thus, the proposed device provides the creation of forces, ensuring the destruction of the adhesion of a layer of dust with a small loss of average stress. Due to this, the accumulation of dust by electrodes is prevented, and consequently, the corona current and gas cleaning efficiency increases, which eliminates the discharge of the corona electrodes, and therefore increases the reliability of the electrodes.

FIG. 2 shows the second (minor) version of the device, including the same elements as

Fig. 1 and different

only the place of inclusion

Claims (1)

Invention Formula A device for feeding an electrostatic precipitator containing a high constant voltage source, the positive terminal of which is instantiated and connected to the first output terminal for connecting an electrostatic precipitator, the controlled key element being connected counter-parallel to the output of the said source, characterized in that increase of reliability in operation and degree of gas purification; a reactor is additionally introduced; it is included between a negative terminal of a high constant voltage source and a second terminal of a terminal for connecting an electrostatic precipitator. f CL / / L t, tt t, tt t, if / / FiaZ Editor N. Gunko Compiled by L. Ustinkina Tekhred L.Oleynik Proofreader L. Patay Order 1329/58 Circulation 631 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Branch PPP Patent, Uzhgorod, st. Project, 4