石化装置安全仪表系统设计软件的开发与实现

Design and implementation of petrochemical facility safety instrumented system software

为了让设计人员更好地设计石化装置安全仪表系统,采用了C#和SQL数据库开发的石化装置安全仪表系统设计软件。首先,软件结合危险性与可操作性分析风险矩阵和保护层,确定安全仪表系统的安全完整性等级,并使用故障树或可靠性框图模型验证安全完整性等级,确定安全仪表系统生命周期参数。然后,软件基于多套装置安全仪表系统经验知识,总结了安全仪表系统分类信息,并依此确定待设计装置的安全仪表系统相关信息。最后,综合前两步的设计结果,确定最终的安全仪表系统。通过实例探讨了软件的应用过程,在一定程度上保证了安全仪表系统设计的完整性与可靠性。

Based on C # and SQL database, petrochemical facilitysafety instrumented system design software （PFSIS） has been devel oped, which help designers to design a better safety instrumented sys tem （SIS）. The design procedure of PFSIS contains four parts： de sign based on risk analysis, design based on experience, comprehen sive comparison between the above two results, determine the final results for safety instrumented system design. The process of design based on risk analysis includes two parts. Firstly, PFSIS combines with three process hazard analysis （PHA） methods, which are hazard and operability analysis （HAZOP） method, risk matrix analysis method and layer of protection analysis （LOPA） method. By this way, PFSIS acquire the safety instrumented functions （SIFs） of safety instrumented system and assess the safety integrity level （SIL） re quirement for safety instrumented function. Then the fault tree model or reliability block model have been selected to validate the safety in tegrity level and obtain the life cycle values of safety instrumented system. Furthermore, through the research application of safety in strumented system in multiple sets of petrochemical units which in clude hydrogenation unit, catalytic cracking unit and epoxy ethane production unit and so on, a classification information database of safety instrumented system was established in PFSIS. The database contains 18 types of safety instrumented system information which cor respond to 18 types of common petrochemical facilities. The process of design based on experience includes two parts. Firstly, PFSIS i dentifies the style of petrochemical facility, and then design process will be completed according to the database. After comparison be tween the above two design results, PFSIS achieves the final safety instrumented system for a facility. In the end, this paper also illus trates the whole application process of PFSIS by showing safety instru mented system design of circulating hydrogen desulfurization tower in hydrogenation unit. The result shows that PFSIS can ensure the in tegrity and reliability of safety instrumented system design.