SU1477477A1 - Power supply device for electrostatic precipitator - Google Patents

Abstract

The invention relates to the electrical purification of gases, can be used in various areas of the national economy for powering electrostatic precipitators and allows increasing the reliability of the device and increasing the degree of gas cleaning. The device for powering the electrostatic precipitator contains sources 1, 10, constant voltage connected by opposite poles through resistors 2 and 11 and capacitor 3. Parallel to source 1 through resistor 2, switch 4 is turned on, shunted by a counter diode 5. Negative pole of source 10 through current limiting resistor 11 and current reactor 6 is connected to the electrostatic precipitator electrodes 7. The connection point of the resistor 11 and the reactor 6 through a diode 9 connected in the opposite direction, is connected to earth. To control the operation of the switch 4, the output of the control system 12 is connected to its control electrode. 1 sludge.

Description

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The invention relates to the field of electrical gas cleaning and can be used in various areas of the national economy of electrostatic precipitators.

The aim of the invention is to increase the reliability of the device and increase the degree of gas cleaning.

The drawing shows a block diagram of a device for feeding an electrostatic precipitator.

The device contains the first source of constant voltage 1, the first current-limiting element 2, the separation capacitor 3, the key 4, the first shunt diode 5, the reactor 6 connected to the discharge electrode of the electrostatic precipitator 7, the collecting electrode 8 of which is connected to the diode 9 with the positive pole of the second constant-voltage source 10 and with the negative pole of the first source 1. The source 10 is connected to the second current-limiting element 11 by its negative pole. The operation of the key 4 is determined by the control system 12.

The device works as follows.

A constant voltage of negative polarity is applied to the electrodes 7 and 8 of the electrostatic precipitator from the source 10 of a constant voltage through series-connected limiting element I and the reactor 6J at the same time charging the capacitor 3. From the source 1 of a constant voltage capacitor 3 through the current limiting element 2 is charged additionally. The system 12 of controlling the activation of the key 4 puts it into a conducting state. The capacitor 3 is discharged through the switch 4 and the reactor 6 into the tank formed by the electrodes 7 and 8 of the electrostatic precipitator. The first period of the discharge current flows through the switch 4, the voltage across the electrodes 7 and 8 of the electrostatic precipitator increases. The second half-cycle of the discharge current flows through diode 5, the voltage on the electrodes of the electrostatic precipitator decreases to a value slightly greater than before the onset of the pulse. This excess depends on the losses in the discharge circuit and the energy consumption for the corona discharge between the electrodes 7 and 8 of the electrostatic precipitator. During the breakdown between electrodes 7 and 8 of the electrostatic precipitator, the capacitor 3 is recharged through the channel of the breakdown between electrodes 7 and 8 of the electrostatic precipitator, but when the potential at diode 9 changes to a value that converts it to conductive state, it opens and bridges the series-connected reactor 6 and electrodes 7 and 8 electrostatic precipitators. The further process of the flow of the first half-wave of current and recharging of the capacitor 3 does not depend on the non-linear parameters of the channel of the gap between the electrodes 7 and 8 of the electrostatic precipitator. During the time during which the diode 9 is in the conducting state, the breakdown channel between the electrodes 7 and 8 is deionized and restores its electrical strength. The second half-wave of current flows through the reactor 6 and diode 5. Diode 9 is blocked by the changed potential. The capacitance formed by the electrodes 7 and 8 of the electrostatic precipitator is charged, and the voltage on the electrodes 7 and 8 of the electrostatic precipitator is restored. The discharge time from the electrodes 7 and 8 of the electrostatic precipitator is reduced to a minimum, which increases the average voltages on the electrodes 7 and 8 of the electrostatic precipitator and, accordingly, the degree of purification. Overvoltage on the capacitor 3 and key 4 is completely eliminated, which increases their reliability and simplifies their design. The reactor 6 damps the high-frequency oscillations that occur during the breakdown of the gap between the electrodes 7 and 8 of the electrostatic precipitator, is also an element that generates pulses. The voltage pulse level at the next switching on of the key 4 does not depend on the technological processes in the interval between the electrodes 7 and 8 of the electrostatic precipitator; therefore, no re-breakdown occurs at this switching on, while the control systems of the constant voltage sources 1 and 10 are maximized pulse amplitude is possible. These conditions provide an increase in the degree of purification of the electrostatic precipitator.

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Due to the shunting of diode 9 of series-connected reactor 6 and electrodes 7 and 8 of an electrofilter, energy losses in the electrostatic precipitator are reduced when the gap between electrodes 7 and 8 of the electrostatic precipitator is broken.

Claims (1)

Invention Formula A device for feeding an electrostatic precipitator containing two sources of direct voltage, a switch with a control system, a isolating capacitor, current-limiting elements and a shunt diode, with the positive pole of the first constant voltage source through the series-connected first limiting element, the isolating capacitor and the second the current limiting element is connected to the minus pole of the second constant voltage source, the other two poles of the constant voltage sources are connected to common wire and precipitating electrode of the electrostatic precipitator, the key its output is connected to the point of connection of the first current-limiting element to the separation capacitor, its input is connected to the common wire, and the shunt diode is connected opposite in parallel, characterized in that, in order to increase the reliability of the device and increase the gas cleaning rate, it additionally contains a reactor and a second a shunt diode, wherein the reactor is connected by one output to the point of connection of the second current of the limiting element with the coupling capacitor and the anode of the second shunt diode, another conclusion is with the electrostatic precipitator corona electrode, and the cathode of the second shunt diode is connected to the common wire.