SCI和EI收录∣中国化工学会会刊

›› 2008, Vol. 16 ›› Issue (1): 52-56.

• SELECTED PAPERS FROM THE 4th INTERNATIONAL SYMPOSIUM ON DESIGN, OPERATION AND CONTROL OF CHEMICAL PROCESSES • Previous Articles     Next Articles

A Signed Digraphs Based Method for Detecting Inherently Unsafe Factors of Chemical Process at Conceptual Design Stage

WANG Hangzhou1, CHEN Bingzhen1, HE Xiaorong1, QIU Tong1, ZHANG Longjiang2   

  1. 1. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;
    2. Chemicals & Marketing Company, Petro China Company Limited, Beijing 100011, China
  • Received:2007-05-23 Revised:2007-10-27 Online:2008-02-28 Published:2008-02-28

A Signed Digraphs Based Method for Detecting Inherently Unsafe Factors of Chemical Process at Conceptual Design Stage

王杭州1, 陈丙珍1, 何小荣1, 邱彤1, 章龙江2   

  1. 1. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;
    2. Chemicals & Marketing Company, Petro China Company Limited, Beijing 100011, China
  • 通讯作者: CHEN Bingzhen, E-mail: dcecbz@tsinghua.edu.cn

Abstract: Digraph-based causal models have been widely used to model the cause and effect behavior of processsystems. Signed digraphs (SDG) capture the direction of the effect. It should be mentioned that there are loops in SDG generated from chemical process. From the point of the inherent operability, the worst unsafe factor is the SDG having positive loops that means any disturbance occurring within the loop will propagate through the nodesone by one and are amplified gradually, so the system may lose control, which may lead to an accident. So findingthe positive loops in a SDG and treating these unsafe factors in a proper manner can improve the inherent safety of a chemical process. This article proposed a method that can detect the above-mentioned unsafe factors in the process conceptual design stage automatically through the analysis of the SDG generated from the chemical process. Acase study is illustrated to show the working of the algorithm, and then a complicated case from industry is studiedto depict the effectiveness of the proposed algorithm.

Key words: signed digraphs, inherent safety, conceptual design

摘要: Digraph-based causal models have been widely used to model the cause and effect behavior of processsystems. Signed digraphs (SDG) capture the direction of the effect. It should be mentioned that there are loops in SDG generated from chemical process. From the point of the inherent operability, the worst unsafe factor is the SDG having positive loops that means any disturbance occurring within the loop will propagate through the nodesone by one and are amplified gradually, so the system may lose control, which may lead to an accident. So findingthe positive loops in a SDG and treating these unsafe factors in a proper manner can improve the inherent safety of a chemical process. This article proposed a method that can detect the above-mentioned unsafe factors in the process conceptual design stage automatically through the analysis of the SDG generated from the chemical process. Acase study is illustrated to show the working of the algorithm, and then a complicated case from industry is studiedto depict the effectiveness of the proposed algorithm.

关键词: signed digraphs, inherent safety, conceptual design