电容层析成像技术测量煤粉输送浓度的研究

Study on the Measurement of Pulverized-coal Concentration using Electrical Capacitance Tomography

采用电容层析成像技术，对常温下稀疏气力输送的煤粉浓度进行了测试研究。为了利用电容传感器敏感场的分布特性，实验系统中设置了一旋风分离装置，通过旋风分离作用将煤粉颗粒集中在壁面区域，传感器电极布置在分离器直管上。改变螺杆给粉速度以及风量可改变煤粉输送浓度，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对比分析，表明利用该方法测量煤粉输送浓度结果准确、可靠。

Based on electrical capacitance tomography, subtle mass flow measurement of pulverized coal pneumatically conveyed under normal temperature conditions is studied. To adequately make use of the capacitance sensors ensitivity field, a cyclone separator is set up in the experimental system, which could gather solid particles on wall areas, while the sensor pole is placed on straight section of the separator. 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 experimental results.