Study on A Method of Steam Wetness Measurement based on Microwave Resonant Cavity

摘要：

A method of wetness measurement based on microwave resonant cavity perturbation for wet steam is presented. The dielectric characteristic of wet steam in turbine was analyzed. The dielectric constant of wet steam only depends on the humidity of the steam at a certain temperature. The humidity of the wet steam can be attained by measuring the frequency deflection of the resonant cavity when the wet steam flows through the cavity. A system of steam wetness measurement based on this method and a resonant cavity with special structure were designed. The resonant cavity which has a three-ring network separator at each end is the most suitable cavity. The deposition film on the cavity interior wall is very thin when wet steam flows through the resonant cavity,and it is only a few microns. The influence of water film on measurement result can be neglected.Comparing with the thermodynamic methods and optic methods,the system of this method is simple and can be achieved online for measuring the humidity of flowing wet steam. This method has a high precision.

关键词： steam wetness measurement microwave resonant cavity numerical simulation ezperiment

作者: Han Zhonghe Qian Jiangbo

作者单位: Key Lab of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education,North China Electric Power University,Baoding 071003,China

会议类型: 国际会议

会议名称: 2009 9th International Conference on Electronic Measurement & Instruments(第九届电子测量与仪器国际会议 ICEMI2009)

会议地点: 北京

会议语种:英文

页码: 604-607

在线出版日期: 2009-08-16（万方平台首次上网日期，不代表论文的发表时间）