【摘要】：針對國內(nèi)某1000 MW超超臨界二次再熱機組FSSS系統(tǒng)的核心功能MFT進行了研究,參照IEC61508標(biāo)準(zhǔn)中的理論,對MFT中爐膛風(fēng)量小于25%觸發(fā)這一子安全功能進行了功能安全分析。利用保護層分析的方法完成對爐膛內(nèi)爆和外爆2種危險的保護層分析,并依據(jù)IEC61508標(biāo)準(zhǔn)中的定量計算SIL等級的方法,結(jié)合OREDA數(shù)據(jù)庫中相關(guān)數(shù)據(jù)及我國電力公司統(tǒng)計調(diào)研的結(jié)果,使用風(fēng)險圖法定性確定電站鍋爐FSSS系統(tǒng)的目標(biāo)安全完整性等級。通過對爐膛風(fēng)量小于25%的故障樹建模,結(jié)合EXIDA數(shù)據(jù)庫中相關(guān)數(shù)據(jù)定量計算實現(xiàn)該安全功能的安全相關(guān)系統(tǒng)的安全完整性等級(SIL),并對執(zhí)行機構(gòu)失效率過高進而影響了系統(tǒng)的整體安全完整性等級的問題給出了修改方案。
[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.
【作者單位】： 北京國電智深控制技術(shù)有限公司;北京市電站自動化工程技術(shù)研究中心;國電建投內(nèi)蒙古能源有限公司;
【分類號】：TM621.2
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本文編號：2217228