SU1209299A1 - Apparatus for feeding electric wave filter with alternate voltage - Google Patents

Description

2. The device according to claim 1, characterized in that, in order to prevent overvoltages occurring at the time of unplugging of the power supply network of the electrostatic precipitator, the device is additionally equipped with an electric capacitance connected to the positive 1st and negative outputs of the external voltage source bridge,

3. The device according to PP, 1 and 2, that is, in order to limit the switching currents when changing the polarity of the voltage, the device is additionally equipped with a resistor connected in series with the electrostatic precipitator.

The invention relates to electro-gas cleaning and can be used dp power electrostatic precipitators, trapping high impedance circuits,

The purpose of the invention is to reduce the cost and increase the efficiency of the electrostatic precipitator.

FIG. 1 is a schematic diagram of an electrostatic precipitator power supply device with alternating voltage; in fig. 2 is a high-voltage switch circuit.

The device consists of a source of voltage of different polarity with a voltage regulating unit 2 and a rectifying bridge 3 having high-voltage outputs of positive and negative polarities isolated from the ground. The voltage source 1 is connected to the high voltage switch 4, which commutates the polarity of the voltage applied to the electrostatic precipitator 5. Switch 4 contains four switching elements 6–9, with elements 6 and 7 connected to the positive output of the rectifying bridge 3, and elements 8 and 9 to its negative output. In addition, the switching elements 6 and 9 are connected to the electrostatic precipitator 5, and the elements 8 and 9 are connected to the grounding circuit 10, the grounding circuit B is set to 10. 1J resistor, the signal from which is proportional to the consumed electrostatic flow. The current is supplied to the voltage regulating unit 2 and the control unit 12

4, Device by. pp , characterized in that the mutating elements are made in the form of a pair of contact ring sectors, between which a switching film is placed, mounted on a shaft located along the axis of the sectors and connected to the drive,

 Sector and bar are isolated from the ground.

5, the device according to claim 4, wherein the switch is provided with a switch position sensor connected to the control unit,

laziness switch. The control unit 2 from the divider formed by the resistors 13 and 14, also gives a signal proportional to the voltage

on the electrostatic precipitator 5 "

To limit switching overvoltages and currents, an electrical capacitance 15 is connected between the positive and negative terminals of the rapid bridge, and resistor 16 in series with the electrostatic precipitator

Depending on the current consumed by the electrostatic precipitator (from 10 to

100 mA) the capacitance value is selected in the range of 0.1-10 from the capacity of the electro-filter, and the resistor value is from 10 of the static resistance of the electrostatic precipitator at

his work.

A high-voltage mechanical switch 4 (Fig. 2) contains switching elements 9 made as a pair of isolated from the ground contact sectors of the sectors 17, between which with a gap there is a switching strip 18 insulated from the ground and mounted on the axis of the annular sectors and connected to the drive with an adjustable rotational speed (not shown), Contact ring sectors 17 are installed on insulators 20, and clamping bars 18 on insulators 2.

3

A sensor 22 of the position of the switching strips 18 is connected to BtuiOM 19, the signal from which is supplied to the voltage regulating unit 2,

The power supply device of the electrostatic precipitator by alternating voltage works as follows.

The voltage from the output of the intermediate bridge 3 is fed to the high-voltage switch 4. With the closed switching elements 6 and 8 and the open 7 and 9, the positive washing output is connected to the electrostatic precipitator and the negative one is grounded. In this case, a positive polarity voltage is applied to the electrostatic precipitator. With elements 7 and 9 closed and 6 and 8 open, a negative voltage is applied to the electrostatic precipitator.

Switching switching control is carried out by the switch control unit 12, which sets the switching frequency of the polarities and the ratio of the durations of the voltage pulses of each polarity. The voltage value for each polarity is set separately by the control unit 2. The optimal values of the parameters of the alternating power supply of the electrostatic precipitator 5 are set taking into account the effective value of the voltage on the electrostatic precipitator and the current consumed by it, the signals of which from resistors 11 and 14 are fed to blocks 2 and 12.

High voltage lamps, thyristors, controlled arresters or mechanical switches can be used as switching elements 6–9.

092994

For alternating power supply of industrial electrostatic precipitators, dedusting high-resistance aerosols, voltage pulse duration

5 of both signs are within), 2-0.5 to 1-3 s, which can be provided by a mechanical high-voltage commutator, the circuit of which is shown in FIG. 2,

10 SRI shaft 19 commuting strips 18 alternately closes the ring sector 17 providing synchronous switching elements 6-9 (Fig, 1). Frequency of alternating voltage for

15 is given by block 12 by varying the speed of rotation of shaft 19; the ratio of the pulse ratios of the voltage of each polarity is determined by the time the bar 18 passes between

20 by ring sectors 17 and adjusted (at a given frequency) by changing the length of the ring sectors 17.

25 When switching the polarity of the voltage on the electrostatic precipitator at a consumed current of 200-250 mA, to limit switching overvoltages and currents, it is enough to turn on the 30 power supply device of the capacitor 15 and the resistor 16 without switching off the voltage source during switching. When switching currents above 250 mA, it is necessary to disconnect source 1 for the duration of switching.

tension This is accomplished with the help of the switch 22 position of the switching strips 18 connected to the shaft 2 connected to the block 2 and connected to the shaft 19.

Compiled E, Skl rsky Editor N. Dumbass Tehred M. Nadi Corrector I. Muska

349/13 Circulation SlS Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow,. Raushsk nab, d.4 / 5

Filial ShSh Patent, g, Uzhgorod, st. Project, 4

phi.2

Claims (5)

1. ELECTRIC POWER SUPPLY. REFILTER WITH VARIABLE VOLTAGE, containing a voltage source of equal polarity with a voltage control unit and a rectifier bridge with positive and negative outputs and a ground circuit, a high-voltage switch with two switching elements and a switch control unit, characterized in that, in order to reduce cost and improving the efficiency of the electrostatic precipitator, the high-voltage switch is additionally equipped with two switching elements, while one pair of switching elements is connected to the positive is the output of the rectifier bridge of the voltage source, and the other pair has a negative output, and in each pair one switching element is connected to the electrostatic precipitator, and the other to the ground circuit connected to the voltage control unit and the switch control unit. <p </ «1 2. The device according to π. 1, characterized in that, in order to exclude the occurrence of overvoltages at the time of opening the power supply circuit of the electrostatic precipitator, the device is additionally equipped with an electric capacitance connected to the positive and negative outputs of the rectifier bridge of the voltage source. 3. The device popp, 1 and 2, characterized in that, in order to limit switching currents when changing the polarity of the voltage, the device is additionally equipped with a resistor connected in series with the electrostatic precipitator. 4, The device according to. p. 1-3, characterized in that the switching elements are made in the form of a pair of contact annular sectors, between which there is a switching film mounted on a shaft located along the axis of the sectors and connected to the drive, while the sectors and strip are isolated from the ground. 5. The device pop, 4, characterized in that the switch is equipped with a position sensor of the switching strips connected to the control unit,