基于IEC61508标准电站锅炉MFT的功能安全评估  

Functional Safety Analysis of MFT in the 1000 MW Ultra-supercritical Double Reheat Unit in Accordance with IEC61508

作　　者：王耀[1,2] 王新宁 王疆[1,2] 

机构地区：[1]北京国电智深控制技术有限公司,北京102200 [2]北京市电站自动化工程技术研究中心,北京102200 [3]国电建投内蒙古能源有限公司,内蒙古017209

出　　处：《自动化与仪表》2016年第12期9-13,共5页Automation & Instrumentation

摘　　要：针对国内某1000 MW超超临界二次再热机组FSSS系统的核心功能MFT进行了研究,参照IEC61508标准中的理论,对MFT中炉膛风量小于25%触发这一子安全功能进行了功能安全分析。利用保护层分析的方法完成对炉膛内爆和外爆2种危险的保护层分析,并依据IEC61508标准中的定量计算SIL等级的方法,结合OREDA数据库中相关数据及我国电力公司统计调研的结果,使用风险图法定性确定电站锅炉FSSS系统的目标安全完整性等级。通过对炉膛风量小于25%的故障树建模,结合EXIDA数据库中相关数据定量计算实现该安全功能的安全相关系统的安全完整性等级(SIL),并对执行机构失效率过高进而影响了系统的整体安全完整性等级的问题给出了修改方案。Aiming at the core function MFT of FSSS system of a 1000 MW ultra supercritical reheat unit in China is studied. According to the theory of IEC61508,the safety function of the sub-safety function of the MF＇F is less than 25%. Based on the analysis of the protective layer,the protective layer analysis on the implosion and explosion of the furnace is completed. According to the SIL grade method in the IEC61508 standard,the data in the OREDA database and the statis- tical research results of the Electric Power Companies,using the risk map to qualitatively determine the target safety in- tegrity level of the FSSS system of the utility boiler. The safety integrity level（S/L） of the safety-related system is quanti- fied by the calculation of the relevant data in the EXIDA database,and the failure rate of the actuator is too high,which affects the reliability of the system The overall safety integrity level of the problem,given the modified program.

关 键 词：锅炉炉膛安全监控系统 MFT 保护层分析 故障树建模 IEC61508标准 

分 类 号：TP277[自动化与计算机技术—检测技术与自动化装置]