火电机组低负荷运行对末叶片可靠性的影响

Impact of Low Load Operation of Thermal Power Units on Last Stage Blade Reliability

在双碳目标下,为了配合新能源的发展,火电机组的调峰能力得到了前所未有的关注。结合电力需求增速放缓的现状,火电机组将较长时间运行在低负荷工况下。本文选取某660 MW空冷机型末三级级段进行了多个低负荷工况下的CFD分析,获得了负荷下降过程中末级流场的变化特征,并分析了相关变化对末叶片可靠性的影响,介绍了相关的解决措施。

Under the Double Carbon target,the peaking capacity of thermal power units has received unprecedented attention.In order to coordinate the development of new energy sources,combined with the slowdown in power demand growth,thermal power units will operate under low load conditions for a larger hourage.In this paper,CFD analysis of the last three stages of a 660 MW air-cooled model was carried out under several low load conditions to obtain the characteristics of the changes in the flow field of the last stage during the load drop,and to analyse the impact of the relevant changes on the reliability of the last stage blade and introduce the relevant solution measures.