SU1407551A1 - Apparatus for supplying electrostatic filter - Google Patents

Abstract

The invention relates to electrical engineering, can be used in installations of electron-ion technology, in particular in gas-cleaning electrostatic filters, and makes it possible to increase the reliability and increase the degree of gas purification. The power supply device of the electric filter contains a step-up transformer 1, in the primary winding of which a bridge is successively connected, consisting of thyristors 2, 3 and diodes 4, 5, the diagonal of which includes reactor 6 and current sensor 7, trigger 9, the reset input of which is connected through, the OR IQ scheme, with the trigger setup block 17 of the trigger 9 and with the threshold element 8 connected with the current sensor 7, the trigger input is connected via the breakdown sensor 16, with the voltage divider 15 connected in parallel with the electrostatic precipitator electrodes 14 and straightened The bridge is 13, and the output is via a resistor 11 with the input of the control unit 12 connected to the control inputs of the thyristors 2, 3. 1 sludge. 1 (/ С

Description

The invention relates to electrical engineering and can be used in installations of electron-ion technology, for example, in gas cleaning electrostatic filters.

The aim of the invention is to increase reliability by reducing current overloads and increasing the degree of gas purification by increasing the average voltage on the electrostatic precipitator.

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

The block diagram contains a step-down transformer 1 containing in the primary winding a series-connected bridge consisting of thyristors 2, 3 and diodes 4, 5, a limiting reactor 6 and a breakdown sensor 7, the output of which is connected to the threshold element 8, trigger 9, the resetting input of which is connected to element 8 via the OR 10 circuit, and the output through a resistor 1I with the locking input of the control unit 12, a diode bridge rectifier 13, which is connected to the secondary winding of the transformer 1 and the output of which is connected to an electrostatic precipitator 14 and a divider 15 nap w e- t NIN, sensor 16 breakdowns in the electrostatic precipitator, whose input is connected to the output of the voltage divider 15, and output to the trigger input of the trigger 9, block 17 of the initial installation of the trigger 9 i connected to the second input of the OR 10 circuit.

The device works as follows.

The voltage applied to the primary winding of transformer 1 is controlled by using thyristors 2 and 3 by changing the phase of the pulses supplied from. the output of the control unit 12. After straightening by bridge 13, a high voltage is applied to the electrodes of the electrofilter 14, whose operation is accompanied by breakdowns in it (spark or arc). During the breakdown, the voltage on the electrostatic precipitator 14 decreases sharply, which is detected by the breakdown sensor 16. The latter is triggered and forms: a pulse that arrives at the triggering input of trigger 9, producing a single signal at its output, arriving at the locking input of control unit 12 and prohibiting the supply of control pulses to thyristors 2, Current grown in the winding breakdown transformer limited

5 0 5

0 5 s

0

reactor 6 and is closed through diodes 4 and 5. When this current drops to a level below 40-80% of the nominal, the threshold element 8 is turned off, changing the signal from one to zero. In this case, through the scheme OR 10, the trigger 9 is set to the zero position.

Thus, after each sample, control pulses on thyristors 2 and 3 from the output of control block 12 are received only after current in reactor 6 is reduced. If you do not control the decrease in current in reactor b to the specified level, and apply control pulses to thyristors 2 and 3, when | a re-breakdown occurs (after a control pulse is applied), the reactor 6 is not able to limit the breakdown current, since the current in it is large. If the breakdown in the electrostatic precipitator I4 occurs at the end of the half-wave voltage and is not accompanied by a high current level, the effect of the probe 16 on the input of the trigger 9 does not trigger it,.

Thanks to this solution, the most optimal control is ensured. If reactor 6 is ready for current limiting. That pause in the supply of pulses from the control unit 12 to the thyristors 2 and 3 is not, and vice versa. This allows to increase the output voltage, which leads to an improvement in the degree of gas purification. On the other hand, dangerous overloads of the device are eliminated, which leads to an increase in its reliability with a significant simplification of the power circuit.

Claims (1)

Invention Formula An electrostatic precipitator powering device containing a transformer, an AC regulator with a control loop, a reactor, a breakdown sensor, and a rectifier whose code is connected to the electrostatic precipitator electrodes, and the AC regulator is connected to the primary winding of the transformer, the secondary winding of which is connected to a rectifier that is different By the fact that, in order to increase reliability by reducing current overloads and increasing the degree of gas purification due to an increase in the average voltage on the electrostatic precipitator, neighbors voltage divider connected in parallel with electrodes 314075514 a trofilter, a reactor current sensor, a thyristor, and its blocking input is a trigger element, a trigger, an OR circuit, a resistor is connected to the output of a trigger unit for initial setup of a trigger player, the output of a voltage divider is through the resistor, with the variable controller, the breakdown sensor is connected to the starting current made in the form of a bridge, connecting the trigger input, the sensor output the second of two diodes and two, thyratron reactor through the threshold element Sterov The diagonal of the bridge is subsequently connected to the first input of the OR circuit, The reactor and sensor are turned on. The second input is connected to the unit. the reactor current, the outputs of the control unit for the initial setup of the trigger, and the outlets are connected to the control inputs with a reset input of the trigger.