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为综合分析检验测试因素对安全仪表系统(SIS)安全评估的影响,基于多阶段马尔科夫模型,提出一种SIS安全评估方法。首先,基于多指标优化方法确定检验测试策略,并构建运行期的马尔科夫状态转移模型以及涉及测试自身引起失效概率和非理想检验测试率的检验测试模型;然后,融合马尔科夫状态转移模型和检验测试模型得到多阶段马尔科夫模型;最后,将该模型应用于某循环流化床(CFB)锅炉压力保护系统的安全等级评估中。结果表明,多阶段马尔科夫模型能够综合考虑检验测试自身引起失效概率和非理想检验测试率对SIS失效率的影响;检验测试因素对SIS的安全性有较大影响,因此不容忽略。
In order to comprehensively analyze the influence of test and test factors on the safety assessment of safety instrumented system (SIS), a SIS safety assessment method based on multi-stage Markov model is proposed. First of all, the test strategy is determined based on the multi-index optimization method. The Markov state transition model and the test model which involves the failure probability and the non-ideal test rate are constructed. Then, the Markov state transition model And test the test model to get the multi-stage Markov model. Finally, the model is applied to the safety grade assessment of the pressure protection system of a circulating fluidized bed (CFB) boiler. The results show that the multi-stage Markov model can comprehensively consider the impact of the test failure probability and the non-ideal test test rate on the SIS failure rate. The test test factors have a greater impact on the safety of the SIS and should not be neglected.