基于FTA方法的燃气轮机涡轮出口温度场不均故障诊断

Research on Fault Tree Analysis of the Uneven Distribution of Turbine Outlet Temperature Field

本文基于故障树分析(FTA)方法以某型燃气轮机发电机组并网发电过程中,涡轮出口温度场出现不均匀现象为顶事件,建立故障树,通过设计复查、质量复查、孔探仪检视和机理分析对故障树底事件进行逐一排除,并对比排故措施贯彻前后涡轮出口温度离散度,最终确定天然气含水引发喷嘴结垢是导致涡轮出口温度场不均的原因。

In the process of generation in a power station by the gas turbine system,the temperature distribution of turbine outlet goes wrong. So a fault tree is built,in which this fault is set as top event. Then bottom events in this fault tree are gradually eliminated by design process check,design quality check,inspection hole check and mechanism analysis. In addition,the scatter degree of turbine outlet temperature distribution is compared before and after the solution is implemented. Eventually,the natural gas with excessive water content,which leads to fuel nozzle dirty,is the cause of this fault.