RU2405631C2 - Method of protecting and monitoring state of communication lines of actuating mechanisms of devices for regenerating gas cleaning electrical and bag filters - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: invention relates to cleaning gases from dust and fog in different industries and agriculture and can be used in devices for automatic control and protection of systems for regenerating electrical, bag and other gas cleaning filters. The method of protecting and monitoring the state of communication lines of actuating mechanisms of devices for regenerating electrical and bag filters is characterised by that short-circuit current limiting device is connected in the control circuit, short-circuit current values and load current values in control circuits of regeneration mechanisms are measured and depending on their values, the pickup setting for protection from short-circuits and the minimum current setting of regeneration control elements are installed and a normal operation mode is indicated by the current in the control element being greater than the minimum current setting of the control element and less than the short-circuit setting. A short circuit is indicated by the current value in the control circuit being greater than the minimum current setting of the control element and greater than the short-circuit setting, and the corresponding channel is switched off and a signal is transmitted to the automatic process control system. Circuit opening is indicated by the current value in the control circuit being less than the minimum current setting of the control element and less than the short-circuit setting, and the corresponding channel is switched off and a signal is transmitted to the automatic process control system.

EFFECT: invention increases efficiency of cleaning gases owing to more reliable operation of the filter regeneration system.

1 dwg

Description

The invention relates to the field of gas cleaning from dust and fog in various industries and agriculture and can be used in devices for automatic control and protection of regeneration systems of electric, bag and other gas purification filters.

Known methods for individual and group protection of output circuits, communication lines and actuators of systems for regeneration of bag and gas purification electrostatic precipitators using fuses, used in devices CEP, AUR, PURF, SU, BAUR, SAIL, ARV, ELEX, etc., widely used in industry.

The closest analogue of the invention is the method of protection used in the device ARVM manufactured by NPF AVTEK.

A significant drawback of the above devices is their low reliability.

In networks with sufficiently large short-circuit currents, whose values exceed tens of amperes, low-power semiconductor devices are reasonably used and their protection is carried out by fuses, for switching executive regeneration devices — solenoid valve coils, magnetic starters, relays whose consumption does not exceed hundreds of milliamps, which cannot provide their reliable resistance to short circuit currents. This leads to failure of semiconductor devices, and in the case of group protection, to a complete shutdown of the regeneration system, disruption of the gas cleaning devices and an increase in dust emissions.

The aim of the present invention is to increase the efficiency of gas purification by increasing the reliability of the filter regeneration system.

The technical result is achieved by the fact that a short-circuit current limiting device is installed in the control circuit (for example, a transformer with an increased value of short-circuit voltage or a resistor with a large value of positive temperature coefficient of resistance), the values of short-circuit currents, load currents in the control circuits of the regeneration mechanisms are measured and , depending on their values, set the setting for the operation of the protection against short circuits and the setting for the minimum current of the control elements detecting regeneration and if the current control circuit larger than the minimum current control set point and less than the short circuit current setpoint register a normal operating mode;

when the current value in the control circuit is greater than the minimum current setting of the control element and more than the short circuit setting, a short circuit is recorded, the corresponding channel is turned off and a signal is sent to the automatic process control system;

when the current value in the control circuit is less than the minimum current setting of the control element and less than the short circuit setting, an open circuit is detected, the corresponding channel is turned off and a signal is sent to the automatic process control system.

This makes it possible, in an emergency, to disconnect only the damaged channel, without disrupting the operation of the regeneration system as a whole.

Comparative analysis shows that the differences of the proposed method compared with the prototype are significant.

This allows us to conclude that it meets the criterion of "inventive step".

The drawing shows one of the possible variants of a block diagram of a device for implementing the inventive method.

The block diagram contains a programmable microprocessor controller 1, a multi-channel triac switching unit 2, a unit 3 of regeneration actuators, a power unit 4, a short circuit current limiting device 5, a current sensor 6, a protection unit 7, an input unit for inputting settings from short circuits and idling in the power circuits of the regeneration system, control program input unit 9, alphanumeric display 10, communication unit 11 with automatic process control system.

The scheme works as follows.

When applying 220 V supply voltage to the input of the device (block 4), entering programs using the keyboard (block 11), protection settings (block 8) and performing the “Start” operation, the inputs of block 2 in accordance with the running program consistently appear control pulses from the outputs of the microprocessor controller 1.

In the circuit: power supply 4, switching unit 2, actuator unit of the regeneration system 3, current sensor 6, device for limiting the short-circuit current 5, power supply 4 - a current appears, the value of which will depend on the state of the network and its elements.

At the same time, a signal is received from the output of the current sensor 12 to the input of the protection unit 7, which is analyzed by the logic device of the unit 7, which then issues a control signal to the input of the controller 1.

When the current value in the control circuit is greater than the minimum current setting of the control element and less than the short circuit setting, the alphanumeric display 10 registers the normal operation mode; if the current in the control circuit is greater than the minimum current setting of the control element and more than the short-circuit current setting, a short circuit is recorded, the corresponding channel is turned off and a signal is sent to the control system; when the current value in the control circuit is less than the minimum current setting of the control element and less than the short circuit setting, an open circuit is detected, the corresponding channel is turned off and a signal is sent to the automatic process control system.

For communication with process control, block 11 is used.

This makes it possible, in an emergency, to disconnect only the damaged channel, without disrupting the operation of the regeneration system as a whole.

The method of protection and monitoring the status of communication lines of actuators for the regeneration of electric and bag filters for gas purification passed laboratory and industrial tests as part of the automatic control device ARV MP, showed positive results and high reliability.

Claims (1)

A method for protecting and monitoring the state of communication lines of actuators of regeneration devices for electric and bag filters, characterized in that a short-circuit current limiting device is installed in the control circuit, the values of short-circuit currents, load currents in the control circuits of the regeneration mechanisms are measured and, depending on their values, set short-circuit protection operation setting and minimum current setting of regeneration control elements, and if the current in the control circuit is greater than the settings and the minimum current of the control and less than the current setting short circuit, register the normal mode of operation;
when the current value in the control circuit is greater than the minimum current setting of the control element and more than the short circuit setting, a short circuit is recorded, the corresponding channel is turned off and a signal is sent to the automatic process control system;
when the current value in the control circuit is less than the minimum current setting of the control element and less than the short circuit setting, an open circuit is detected, the corresponding channel is turned off and a signal is sent to the automatic process control system.

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