应用电容层析成像对气固颗粒浓度分布的研究  

Concentration of Dense Gas-solids Flow Based on Electrical Capacitance Tomography

作　　者：王泽璞[1] 刘乾[1] 曹丽平[1] 刘言[1] 刘石[1] 

机构地区：[1]华北电力大学能源与动力工程学院,北京102206

出　　处：《重庆理工大学学报（自然科学）》2012年第3期68-74,共7页Journal of Chongqing University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(50736002;51006106);中央高校基本科研基金资助项目(10MG20);长江学者和创新团队项目(IRT0952)

摘　　要：针对高度循环流化床管道内固相介质的流动具有封闭性和模糊性,一般检测技术不能清晰地反演出HDCFB中固相介质分布特征的问题,选用先进的检测技术——电容层析成像技术——来在线显示HDCFB中固相介质的分布情况。提出了集合ECT测量信息和被测量对象的物理演化信息的广义动态重建算法。该算法同时考虑了被测对象的空间约束、时间约束和被测对象在流动过程的动态变化特性。动态实验研究表明:该算法可成功求解ECT逆问题,确保有一稳定的数值解;ECT可捕获HDCFB内管道截面固相介质的分布情况,成功重建管道内的流动模型。Investigating the distribution characteristics of the solid particles in a high density circulat-ing fluid bed （HDCFB） is vital to strengthen the heat and mass transfer, reduce the pollutant emis-sion and improve the system efficiency. However, solid particles in the pipe of HDCFB was closedand fuzzy, and the regular detection techniques could not invert the distribution characteristics clear- ly. In this paper, electrical capacitance tomography （ECT） technique was employed to visualize thedistribution characteristics of the solid particles in a HDCFB. A generalized dynamic reconstruction model, which integrates ECT measurement information and physical evolution information of the ob-jects of interest, is presented. A generalized objective function that simuhaneously considers the spa-tial constraints, the temporal constraints and the dynamic evolution information of the objects of inter-est in a dynamic process is proposed. Dynamic experimental studies indicate that the proposed algo-rithm is successful in solving ECT inverse problem, and can ensure a stable numerical solution. Inaddition, experimental results reveal that ECT method can capture the distribution behaviors of thesolid particles in the cross section, and successfully reconstruct the typical flow patterns.

关 键 词：高密度循环流化床 电容层析成像技术 固相介质 动态重建算法 

分 类 号：TK123[动力工程及工程热物理—工程热物理]