换热管道污垢热阻直接检测方法与实现  

A Method to Direct Detect Fouling Resistance of Heat Exchanging Pipe and Its Implementation

作　　者：王恭[1] 罗博文 曹生现[1] 赵波[1] 张叶[1] 吕昌旗 WANG Gong;LUO Bowen;CAO Shengxian;ZHAO Bo;ZHANG Ye;LU Changqi(School of Automation Engineering,Northeast Electric Power University,Jilin 132012,Jilin Province,China)

机构地区：[1]东北电力大学自动化工程学院

出　　处：《中国电机工程学报》2018年第14期4165-4172,共8页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51376042);吉林省科技发展计划项目(20150203005sf)~~

摘　　要：目前,电厂循环冷却水换热管道内壁污垢热阻检测多采用间接检测法,其检测过程复杂且易引入多种测量误差。该文提出了一种通过污垢厚度和导热系数检测直接获取污垢热阻的方法。利用超声波时域反射法结合信号处理技术获得管内污垢厚度,通过显微测距分析验证了测量精度;利用瞬态平面热源法获取污垢导热系数,通过残差分析验证了其可信度;根据传热学原理进行公式推导计算获得污垢热阻。以典型碳酸钙污垢为实验对象的测试结果表明：该方法能快速、准确的对污垢热阻进行检测,可信度高、重复性好,对工业换热系统的污垢检测、防垢与抑垢具有重要意义。At present, indirect detection methods have been mostly used to detect fouling resistance of heat exchanging pipe in power plant circulating cooling water system. The detection process is complex and would introduce a variety of measurement error. In this paper, a method of fouling resistance direct detection by fouling thickness and thermal conductivity measurement was proposed. The fouling thickness was obtained using ultrasonic time domain reflectometry（UTDR） combined with signal processing technique, and its measurement accuracy was verified by microscopy. The thermal conductivity was obtained using transient plane source method（TPS）, and its reliability was proved by residual analysis. Finally, according to the principle of heat transfer, the formula was deduced to calculate fouling resistance. The results of typical calcium carbonate fouling test show that, this method can detect fouling resistance rapidly and accurately, with high reliability and good repeatability. It is of great significance for fouling detection, prevention and removal in industrial heat exchange system.

关 键 词：换热管道 超声检测 污垢厚度 导热系数 污垢热阻 

分 类 号：TK172[动力工程及工程热物理—热能工程]