化工装置联锁逻辑设计探讨

Discussion on Design of Interlock Logic for Chemical Plant

联锁逻辑设计是自控设计中的重要环节,自控设计人员需根据工艺安全联锁说明、管道及仪表流程图等编制联锁逻辑图、因果表及复杂逻辑说明等文件。本文分别介绍了不同设计阶段常用的联锁逻辑设计表达方式,通过部分常用的联锁控制方案比较了两种不同风格的联锁逻辑图,以及对机泵的启停控制、联锁旁路设置进行了总结,最后对电气联锁信号的故障安全等问题进行了探讨,期望对联锁控制方案的设计和使用人员起到一定的参考作用。

Interlock logic design is an important part of automatic control design. Automatic control designers need to compile interlock logic diagram, causality table and complex logic description according to process safety interlock description, piping and instrumentation diagram, etc. This paper introduces the interlock logic design expressions commonly used in different design stages, compares two different styles of interlock logic diagrams through some commonly used interlock control schemes, summarizes the start-stop control of pumps and the setting of interlock bypass. Finally, issues such as fail-safe electrical interlock signals are discussed. It is expected to play a reference role for the designers and users of the interlock control scheme.