Process safety is of major importance in chemical industry. Numerous activities have targeted the modification of conventional risk assessment strategies by computer aided approach. In this paper, a software tool for Hazard and Operability (HAZOP) study based on process simulation is presented. Individual components of the proposed software tool are described and the principal methodology of their function is explained. As the simulation engine, commercial process simulator Aspen HYSYS was employed. Proposed tool was applied to a case study of an ammonia synthesis plant based on an existing plant. Hazardous events and operability problems in the syngas purification unit and ammonia synthesis loop have been detected and reported. The steady state multiplicity phenomenon in the ammonia synthesis loop has also been successfully identified. Based on simulation data evaluation performed in the semi-automatic manner by the proposed tool, a HAZOP-like report containing HAZOP deviations and their causes and consequences was generated.

在化学工业中，过程安全性至关重要。许多活动已针对通过计算机辅助方法修改常规风险评估策略的问题。本文提出了一种基于过程仿真的危害与可操作性研究软件工具（HAZOP）。描述了所提出的软件工具的各个组件，并解释了其功能的主要方法。作为仿真引擎，采用了商业流程仿真器Aspen HYSYS。拟议的工具已应用于基于现有工厂的氨合成工厂的案例研究。已经检测到并报告了合成气净化装置和氨合成回路中的危险事件和可操作性问题。氨合成回路中的稳态多重现象也已被成功鉴定。