基于ECT的气固两相流颗粒浓度在线无损检测

颗粒浓度是描述气固两相流动状态的一个重要参数.推导了颗粒浓度与ECT传感器输出电容信号之间的关系,在此基础上开展了气固两相流颗粒浓度在线无损检测研究.在COMSOL+MATLAB环境下进行气固两相流颗粒浓度测量模拟实验,定量评估了图像法和电容法颗粒浓度测量精度.在循环湍动流化床冷模装置上进行了初步的颗粒浓度测量实验研究...

On-line nondestructive particle concentration measurement ofgas-solid two-phase flow based on ECT

Particle concentration is an important parameter describing the flow state of gas-solid two-phase flow. In this paper, therelationship between the particle concentration and the output capacitance signals of the ECT sensor is derived, and the on-linenondestructive particle concentration measurement approach is studied to detect the two-phase flow. The simulation experiment of particleconcentration measurement is performed using COMSOL and MATLAB, by which the accuracies of the image-based and capacitancebased particle concentration measurement approaches are quantitatively evaluated. A preliminary experimental study on particleconcentration measurement of gas-solid two-phase flow is carried out in a circulating turbulent fluidized bed, and the experimental resultsshow that the image-based particle volume concentration measured at the bed height of 200, 300 and 400 mm fluctuates in the range of0. 26~ 0. 75, 0. 09~ 0. 33, 0. 04~ 0. 31, respectively, while the particle volume concentration measured by capacitance-based method isin the range of 0. 27~ 0. 68, 0. 09~ 0. 47, 0. 04~ 0. 26, respectively.