火电机组热控单点信号可靠性分析  

Analysis on Reliability of Single Point Signal for Thermal Control in a Thermal Power Unit

作　　者：张力今 ZHANG Lijin(Huadian Electric Power Research Institute Co.,Ltd.,Hangzhou 310030,China)

机构地区：[1]华电电力科学研究院有限公司,杭州310030

出　　处：《发电设备》2025年第2期90-94,共5页Power Equipment

摘　　要：以某火电机组热控可靠性排查工作为例,对单点信号在机组主、辅机保护及联锁中的可靠性进行分析,辨识其可能存在导致设备误动与拒动的风险,提出相应的完善措施。采用案例分析法,以主燃料跳闸(MFT)信号、空气预热器全停MFT信号等为例对单点信号在保护、联锁、启停允许等条件中的作用进行分析。发现单点信号不仅在主机保护中存在拒动或误动的问题,在重要辅机保护及联锁中也存在类似问题,会对机组安全运行造成严重影响。针对发现的问题,提出增加冗余同类型单点信号构成冗余逻辑、增加不同类型单点信号构成冗余逻辑、取消或改变单点信号对启动允许的限制等建议以提高单点信号逻辑可靠性。Taking the thermal control reliability check of a thermal power unit as an example,analyses were conducted on the reliability of single point signal in the protection and interlock of main and auxiliary engines in the unit,so as to identify the risk of equipment misoperation and refusal-operation,and corresponding improvement measures were put forward subsequently.Using case analysis method,the function of single point signal in protection,interlock,start-stop permit and so on was analysed by taking master fuel trip(MFT)signal and air preheater full stop MFT protection signal as examples.It is found that the single point signal not only has the problem of refusal-operation or misoperation in main engines protection,but also has similar problems of the protection and interlock of important auxiliary engines,which will lead to a serious impact on the safe operation of the unit.In view of the problems found,some suggestions were proposed to improve the reliability of single point signal logic,such as adding the same type of redundant single point signal to form redundant logic,adding different types of single point signals to form redundant logic,and cancelling or changing the limit of single point signal to start.

关 键 词：火电机组 热控 单点信号 可靠性 拒动 误动 

分 类 号：TK321[动力工程及工程热物理—热能工程]