凝汽式汽轮机低压缸相对内效率在线监测方法  

On-line Monitoring Method for Internal Efficiency Ratio of Low-pressure Cylinder in Condensing Steam Turbine

作　　者：李勇[1] 李仁杰[1] 曹丽华[1] 张炳文[1] 

机构地区：[1]东北电力大学能源动力工程学院

出　　处：《化工机械》2014年第3期316-322,338,共8页Chemical Engineering & Machinery

基　　金：国家自然科学基金项目(51376041);吉林省科技发展计划资助项目(20110409);吉林省教育厅"十二五"科学技术研究项目(吉教科合字[2012]第93号)

摘　　要：建立整机开口热力系统和低压缸-低压回热开口热力系统,根据两个热力系统列能量方程式,联立求解小汽轮机的实际焓降,即可得到小汽轮机排汽带入凝汽器的热量。对凝汽器进行热平衡计算,求解得到低压缸的排汽焓值,进而得到低压缸相对内效率。该方法所需测点少、累积误差小、方法简单、过程简捷。对某台660MW汽轮机的小汽轮机进行计算,结果表明,该方法可以实时采集和处理数据,并监测低压缸性能变化。The simultaneous equations of whole steam turbine unit and LP cylinder-LP regenerative heater were established to calculate the practical enthalpy drop of auxiliary turbine and the heat dragged into the condenser by the auxiliary turbine＇ s exhaust steam.Through thermal equilibrium calculation of the condenser,the exhaust steam enthalpy value of low pressure cylinder can be obtained,including the internal efficiency ratio of the low-pressure cylinder.This simple and direct method asks for few measurement points and has small accumulative error.Calculating N-660MW steam turbine shows that the said method can collect and process the data at real time and can monitor performance changes of the low-pressure cylinder.

关 键 词：汽轮机 湿蒸汽焓 低压缸效率 经济性诊断 

分 类 号：TQ051.5[化学工程]