基于电容成像的料腿内气固两相流浓度测量  

Concentration measurement of gas-solid two phase flow in the dipleg based on electrical capacitance tomography

作　　者：孙猛[1] 刘石[2] 李志宏[2] 雷兢[1] 

机构地区：[1]中国科学院工程热物理研究所,北京100080 [2]华北电力大学电站设备状态监与控制教育部重点实验室,北京102206

出　　处：《仪器仪表学报》2009年第2期261-266,共6页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(60672151,50736002)资助项目

摘　　要：旋风分离器是循环流化床锅炉的主要组成部分,其分离效率是影响整个锅炉的重要因素之一。采用电容层析成像技术(ECT),对旋风分离器料腿中的固体颗粒体积浓度进行测量。这种测试方法的优点在于不破坏原有系统的运行特性,属于非侵入式、在线的快速测试技术。电容传感器均匀布置在分离器料腿直管上,电极数目为8。改变螺杆给料速度以及抽吸风量可改变给料浓度,通过对管道截面体积浓度、波动特性以及体积浓度平均测量结果的比较分析,证明这种方法可获得可靠的测量结果。Cyclone separator is one of the main parts in circulating fluidized bed （CFB） boiler. The separation efficiency of the cyclone separator is very important to the whole boiler. Experimental studies were carried out on the volumetric concentration measurement in the dipleg using electrical capacitance tomography （ECT）. The method is not affected by the opacity of the apparatus. In addition, the measurements are taken non-intrusively and rapidly, which makes online analysis possible. In the experiment, the ECT sensor is placed on the straight tube of the dipleg and has 8 electrodes. The concentration is altered by changing the screw feeder speed and the suction amount on the top of the cyclone. The distribution of volume concentration in radial direction, the average volume concentration and the fluctuating characteristics are analyzed. The feasibility and reliability of the method are verified by the experimental results.

关 键 词：电容层析成像 浓度测量 旋风分离器 料腿 气固两相流 

分 类 号：TH744.41[机械工程—光学工程] TQ021[机械工程—仪器科学与技术]