SU1294382A1 - Apparatus for controlling electric precipitator for cleaning gases - Google Patents

Abstract

The control unit of the electrostatic precipitator gas cleaning can be used in units of power supply of electrostatic precipitators, for example, thermal power plants. An increase in the degree of gas cleaning is achieved by more accurate synchronization of the moments of removal and restoration of high voltage on the electrostatic precipitator with hammer blows of the shaking mechanism. Reducing the time of an electrostatic precipitator in a de-energized state due to the removal of voltage from an electrostatic precipitator is not with each hammer blow, but through one or several such shocks makes it possible to increase the average current and voltage of the electrostatic precipitator. with S (L

Description

The invention relates to the electrical cleaning of gases and can be used in power supply units for electrostatic precipitators, for example, thermal power plants and cement plants.

The aim of the invention is to increase the effective operating time by reducing the time of the simple electrostatic precipitator in the de-energized state.

This goal is achieved by more accurate synchronization of the moments of removal and restoration of high voltage on the electrostatic precipitator with hammer blows of the shaking mechanism. In addition, the device allows one to take the voltage off the electrostatic precipitator not with each hammer blow, but through one or several such impacts. Reducing the time of a simple electrostatic precipitator without voltage and the cleaner state of the electrodes makes it possible to increase the average current and voltage of the filter.

The drawing shows a block diagram of the device.

The device contains an electrostatic precipitator 1, a hammer 2, a drive 3 of the shaking mechanism, a sensor 4 for positioning the hammer 2, a controlled rectifier 5, a delay unit 6, a driver 7 for pulses, a one-shot 8.

The device works as follows.

The controlled rectifier 5 supplies a high voltage to the electrostatic precipitator 1, where under the action of this voltage dust particles are deposited from the passing gas. To shake the particles of precipitated dust from the electrodes, the actuator 3 drives a hammer 2, which strikes the electrodes of the filter 1, causing them to break off. The hammering state is detected by the sensor 4 of the hammer 2,

The pulse signal of the position sensor 4 of the hammer 2 starts the delay unit 6, the output of which has a pulse delayed forms 1, which after differentiation in the driver 7 starts the one-shot 8, the output signal of which is fed to the input of the controlled rectifier 5. At the same time, the control rectifier locks , the power supply of the electrostatic precipitator 1 is stopped and the electrostatic precipitator 1 is discharged.

For this reason, when striking a hammer 2, the forces holding the layer of drilled on

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electrodes are significantly weakened, which provides a more complete cleaning of the electrodes.

The time constant of discharge of the dust layer on the electrode depends on its resistivity and varies from fractions of a second to tens of seconds. In accordance with this, the time for which the voltage is taken from the electrostatic precipitator, determined by the duration of the pulses from the single-oscillator, must also be different. For different physicochemical properties of the dust-gas flow, this time can be determined experimentally or by calculation. The angle of advance of sensor 4 is chosen the same for the whole variety of filters and their working conditions, based on the maximum required value of this advance. A decrease in advance is achieved by increasing the time delay of the delay unit 6, which is easily adjustable. Under these conditions, any command device, a limit switch, can be used as a sensor.

Introduction to the driver and one-shot circuit eliminates long-term voltage relief from the electrostatic precipitator when sensor 4 is jammed, since the single-shot produces a relatively short pulse only at the front of sensor 4 (with delay 5).

Claims (1)

Invention Formula The control unit of the electro- gas cleaning filter, which contains the control rectifier connected to the electrostatic precipitator, as well as the position of the hammer of the shaking mechanism, kinematically connected with the drive of the shaking mechanism, is characterized in that by simply reducing the time of the electrostatic precipitator in a de-energized state, a series-connected delay unit, a pulse shaper, a single-vibrator, and an input of the delay unit connected to a sensor ohm hammer position, and the monostable output is connected to the locking input controlled rectifier. sf 0 five 0 five 1 T Editor S.Pekar Compiled by Y. Sigalov Tehred V.Kadar Proofreader I.Musk Order 412/5 Circulation 512 Subscription BNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Proktna str., 4