摘要
针对流动湿蒸气湿度测量的重要性,总结了目前用于测量流动蒸汽湿度的常用方法和正在探讨中的方法,并分析了各方法在应用中的局限性。基于在相同的温度和压力下,饱和湿蒸气的等效介电常数不同,则电容器的容量也不同这一原理,提出并分析了采用圆筒形电容式传感器进行流动蒸汽湿度在线测量的新方法。标定试验结果表明,这种传感器静态特性稳定,在12%的湿度范围内,汽流湿度与输出频率差之间呈现出一种较为明显的非线性关系。同时,文中还提出了标定试验及传感器设计过程中需要注意的问题。
In the light of the importance of flowing wet-steam wetness measurement,summed up were both the commonly used methods and the approach under current exploration for measuring the flowing-steam wetness along with an analysis of the limitations of various methods during their applications.Based on the theory that with a different equivalent permittivity of saturated wet steam the capacity of a capacitor will also be different at an identical pressure and temperature,presented and analyzed was a new approach for the on-line measurement of the flowing-steam wetness by using a cylindrically shaped capacitor type sensor.The calibration test results show that this type of sensors has stable static characteristics,and when the wetness ranges from 0 to 12%,the steam flow wetness assumes a comparatively conspicuous nonlinear relationship with the output frequency difference.Finally,the authors have mentioned problems needing special attention during the calibration tests and sensor design.
出处
《热能动力工程》
CAS
CSCD
北大核心
2009年第2期149-153,共5页
Journal of Engineering for Thermal Energy and Power
关键词
流动蒸汽
湿度测量
等效介电常数
电容法
flowing steam,wetness measurement,equivalent permittivity,capacitance method
