Distributed control system (DCS) for interlocking control valves

Abstract

The invention provides a distributed control system (DCS) for interlocking control valves, which comprises a controller (1), wherein the controller (1) is used for being respectively connected with a plurality of interlocking control valves (3) and can work in a conventional mode and an emergency mode; when working in the conventional mode, the controller (1) controls the valve position opening degrees of the interlocking control valves (3) from an initial opening degree value by using a preset / input valve position opening degree value; and when working in the emergency mode, the controller (1) stops controlling the valve position opening degrees of the interlocking control valves (3), and the valve position opening degrees are reverted to the initial opening degree value in the conventional mode. After the DCS for the interlocking control valves, which is provided by the invention, is interlocked and reset, the phenomenon that field valve position opening degrees of the interlocking control valves are suddenly skipped to the valve position opening degrees before an accident cannot occur, and the control process is simple, the occurrence of twice interlocking can be effectively avoided, so safety risks of a production device is greatly reduced.

Description

technical field [0001] The present application relates to safety interlock control in chemical production equipment, in particular to a distributed control system for interlock control valves. Background technique [0002] Existing chemical production equipment usually adopts DCS system (distributed control system) to realize the automatic control of the production process, such as controlling the control valve installed on the process equipment and the medium flow of the pipeline to control the flow of the process medium. Automatic control of position opening. In the DCS system, the terminal of the DCS operation station (that is, the controller) is connected to each control valve through the system bus, and each control valve can be preset according to the terminal of the DCS operation station or operated by the operator at the terminal of the DCS operation station (such as through the DCS operation interface) The input valve position opening operation command is used to o...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a DCS system that can control the valve position opening of the interlock control valve in the existing chemical production equipment. Automatically change the valve position opening value of the interlock control valve at the terminal of the DCS operation station to the distributed control system for the interlock control valve consistent with the on-site valve position opening

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