基于IEC61508标准电站锅炉MFT的功能安全评估
发布时间：2018-09-01 12:40
【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。
[Abstract]:The core function MFT of a 1000 MW ultra-supercritical secondary reheat unit FSSS system is studied in this paper. According to the theory of IEC61508 standard, the function safety analysis of the sub-safety function of furnace air volume less than 25% trigger in MFT is carried out. The method of protective layer analysis is used to analyze the two kinds of dangerous protective layer of furnace implosion and external explosion. According to the method of quantitative calculation of SIL grade in IEC61508 standard, combined with the relevant data in OREDA database and the result of statistical investigation of power company in our country, The objective safety integrity level of utility boiler FSSS system is determined qualitatively by using risk diagram method. By modeling the fault tree with less than 25% air flow in the furnace, Based on the quantitative calculation of the security integrity level (SIL),) of the security-related system with the relevant data in the EXIDA database, a modified scheme is proposed to solve the problem that the failure rate of the actuator is too high, which affects the overall security integrity level of the system.
【作者单位】： 北京国电智深控制技术有限公司;北京市电站自动化工程技术研究中心;国电建投内蒙古能源有限公司;
【分类号】：TM621.2
，
本文编号：2217228
[Abstract]:The core function MFT of a 1000 MW ultra-supercritical secondary reheat unit FSSS system is studied in this paper. According to the theory of IEC61508 standard, the function safety analysis of the sub-safety function of furnace air volume less than 25% trigger in MFT is carried out. The method of protective layer analysis is used to analyze the two kinds of dangerous protective layer of furnace implosion and external explosion. According to the method of quantitative calculation of SIL grade in IEC61508 standard, combined with the relevant data in OREDA database and the result of statistical investigation of power company in our country, The objective safety integrity level of utility boiler FSSS system is determined qualitatively by using risk diagram method. By modeling the fault tree with less than 25% air flow in the furnace, Based on the quantitative calculation of the security integrity level (SIL),) of the security-related system with the relevant data in the EXIDA database, a modified scheme is proposed to solve the problem that the failure rate of the actuator is too high, which affects the overall security integrity level of the system.
【作者单位】： 北京国电智深控制技术有限公司;北京市电站自动化工程技术研究中心;国电建投内蒙古能源有限公司;
【分类号】：TM621.2
，
本文编号：2217228
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