SU1331565A1 - Apparatus for feeding electric precipitators - Google Patents

Description

the coils of which include thyristor keys 2 and 3 and Drives D. The secondary high-voltage winding of the first T is connected to the input of the first rectifier 5. The positive terminal of the last is grounded, and the negative one is connected to the first serial circuit of resistor 6, droplets 7, shunted by resistor 8, LC- a circuit from a capacitor 9 and droplets 10, shunted by a element of the type dynistor 11 and a diode 12 connected to the precipitating electrode of the filter 13. The secondary high-voltage winding of the second T is connected to the input of the second end

The invention relates to electrostatic precipitators powering devices and can be used in various areas of the national economy where gas cleaning is required.

The purpose of the invention is to improve the reliability of power supply of an electrostatic precipitator with

variable polarity.

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The drawing shows a diagram of a device for powering electrostatic precipitators.

The device contains three-winding step-by-step transformers 1, in the primary windings of which are included thyristor switches 2 and 3 and accumulators 4. The secondary high-voltage winding of the first transformer is connected to the input of the first stage of the terminal 5, the positive terminal of which is grounded, and the negative one is connected to the first series of resistor 6, drossel 7, shunted by a resistor 8, LC circuit from a capacitor 9 and drossel 10, shunted by a dynistor II type element and a diode 12 connected to the filter electrode 13. Secondary and the high-voltage winding of the second transformer is connected to the input of the second rectifier 14, the minus terminal of which is grounded, and the positive one is connected to the second serial circuit from resistor 15, drossel 16, shunted by resistor 17, LC circuit from capacitor 18 and drossel 19,

Terminal 14, the minus terminal of the latter is grounded, and the plus pole is connected to a second series chain of resistor 15, droplet 16, shunted by resistor 17, LC circuit from capacitor 18 and droplet 19, played by dynistor 20 element and diode 21 connected to the deceleration electrode filter 13. The latter is connected to a divider 22, the low-voltage part of which is connected to the input of the regulating element 23, the outputs of which are connected to the control electrodes of the thyristor switches 2 and 3. 1 sludge.

a shunted element of the dinistor type 20 and a diode 21 connected to the precipitating electrode of the filter 13. To the precipitating electrode of the filter 13 is connected a divider 22, the low-voltage part of which is connected to the input of the regulating element 23, the outputs of which are connected to the control electrodes of the thyristor switches 2 and 3.

The outputs of both rectifiers 5 and 14 are connected to chains of capacitors 24 and chokes 25, and the collecting electrode of filter 13 is connected to ground through a resistor 26.

The device works in the following way.

In the mode of dust deposition, the first transformer works, keys 2 and 3

second transformer disconnected. The thyristors of the key 2 of the first transformer are turned on with the required angles, maintaining the required voltage level on the capacitor 24

however, the choke 25 does not have a significant effect on the charging process of the capacitor 24, since its inductive resistance at the charge frequency is small.

When opening at the right moment

the key 3 through it and the secondary winding of the first transformer occurs the discharge of the accumulator 4, which leads to the appearance in the rectifier voltage

Metel 5 steep voltage pulse.

for which choke 25 represents significant resistance. This steep voltage pulse is added to the voltage of the capacitor 24 on the dynistor 11 type element and their sum is higher than the dynistor 11 setpoint. As a result, it triggers, the voltage on it drops to zero.

In the circuit: filter 13 - choke 7 - resistor 6 - choke 25 and capacitor 2A, an oscillatory transient occurs, as a result of which a full sinusoidal oscillation current flows through the electrostatic precipitator, and a pulsating voltage with a constant component occurs through the electrostatic precipitator 13 power loss circuit. This leads to the deposition of dust in the filter 13.

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Diode 12 and resistor 8 provide

reliable dynistor operation 11. The effect on the oscillatory process that arises is drossel 25 is insignificant, since its inductance is substantially less than that of drossel 7.

The second transformer, rectifier 14 and the second sequential circuit work in the line-down mode. The operation in this mode does not differ fundamentally from the considered deposition mode except for changing the polarity on the filter 13 and (if necessary) adjusting other parameters of the oscillating circuit.

Resistor 26 eliminates the possible mutual influence between the settling and spacing parts of the circuit. The divider 22 controls the operation of the regulating element 23.

The voltage distribution between the individual thyristors of the elements of the dynistor type 11 and 20 is provided by known methods.

Editor L. Langazo

Compiled by T.Golenshina

Tehred A. Kravchuk. Proofreader A.Ilyin

Order 3754/7

Circulation 511 Subscription

VNSHPI State Committee of the USSR

for inventions and discoveries 113035, Moscow,) K-35, Raushsk nab. 4/5

Production and printing company, Uzhgorod, st. Project, 4

Thus, it is not possible to make switching at high potential and not having control system elements located at high potential, it is possible to change the polarity of the electrostatic filter and control the working process, affecting the thyristor keys, is located on the ground. This allows a significant increase in the efficiency and reliability of the device.

Claims (1)

Invention Formula 15 A device for powering electrostatic precipitators, containing two povnushchayuschy transformers with one high-voltage and two low-voltage windings, one of which is connected to a power source, thyristor switches in the low-voltage winding circuit, the first and second rectifiers connected to the high-voltage windings with grounded positive and negative leads, respectively, sequential chains consisting of the first resistor, drossel shunted by the second resistor, and connected with plus and minus outputs of voltages, a voltage divider connected to the precipitation electrode and connected to the input of a regulating element, the output of which is connected to the control electrodes of the thyristor switches, a resistor connected to the precipitation electrode, characterized in that, in order to increase the reliability of the device , it additionally contains capacitive accumulators connected to low voltage windings, LC circuits, shunted by controllable elements and diodes and connected to a precipitating electric arc in a chain of Drossel and a capacitor connected to the rectifier inputs, with dynistor being used as controlled elements.