空冷汽轮发电机喘振现象的分析及处理

Analysis and Treatment of Surge Phenomenon in Air-cooled Steam Turbine Generator

为解决燃气-蒸汽联合循环分轴机组启动过程中空冷汽轮发电机单侧进风温度异常升高问题,通过分析该类型机组的汽轮机在冲转升速过程空冷汽轮发电机两端进风温度的温升、发电机端部声音、端盖振动情况、发电机密闭式空气循环通风系统,发现空冷汽轮发电机两端冷却风机具有并联运行轴流风机的特点,某些情况下会发生旋转失速或喘振现象,提出升速过程空冷发电机单侧进风温度快速异常升高是密闭式循环空冷发电机喘振的重要特征。采取相应措施,基本解决了同类型空冷汽轮发电机单侧进风温度异常升高问题,对新建或已投运的同类型机组有借鉴意义。

In order to solve the problem of abnormal increase in single side inlet air temperature of air-cooled steam turbine generator during the start-up process of gas steam combined cycle split shaft unit,by analyzing the temperature rise of the inlet air temperature at both ends of the air-cooled turbine generator,the sound at the generator end,the vibration of the end cover,and the characteristics of the closed air circulation ventilation system of the generator during the thrust and speed increase process of this type of unit.It is found that the operation of the cooling fans at both ends of air-cooled steam turbine generator has the characteristics of parallel operation of axial flow fans,and in some cases,rotational stall or surge phenomenon also occurs.And it is proposed that the rapid and abnormal increase in the temperature of the inlet air on one side of the generator is an important characteristic of the surge of the air-cooled generator in a closed cycle.After taking corresponding measures,the problem of abnormal increase in single-side inlet air temperature of the same type of air-cooled steam turbine generator has been basically solved,which has reference significance for newly built or put into operation units of the same type.