基于电容层析成像技术的流化床内固相体积分数分布特性研究  

Distribution of Solids Volume Fraction in Fluidized Bed Based on Electrical Capacitance Tomography

作　　者：吴桂英[1] 姜平 任金天 关彦军[1] 张锴[1] Wu Guiying;Jiang Ping;Ren Jintian;Guan Yanjun;Zhang Kai(Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation,North China ElectricPower University,Beijing 102206,China;Shanxi Hepo Power Generation Co.,Ltd.,Yangquan Shanxi 045000,China;Changzheng Engineering Co.,Ltd.,Beijing 101111,China)

机构地区：[1]华北电力大学热电生产过程污染物监测与控制北京市重点实验室,北京102206 [2]山西河坡发电有限责任公司,山西阳泉045000 [3]航天长征化学工程股份有限公司,北京101111

出　　处：《煤化工》2019年第1期61-65,69,共6页Coal Chemical Industry

基　　金：国家自然科学基金委与山西煤基低碳联合基金重点项目(U1610254);中央高校基本科研业务费专项(2018ZD03)

摘　　要：针对煤清洁转化过程流化床内复杂气固两相流动特性,采用电容层析成像(简称ECT)技术,考察了流化床内玻璃珠和树脂颗粒瞬时和时均的固相体积分数分布特性。结果表明,利用不同时刻的瞬时固相体积分数等值图,可实现对截面颗粒分布的量化检测;局部时均固相体积分数沿径向呈"中心低、边壁高"的对称分布,截面时均固相体积分数沿轴向呈"下浓上稀"分布,测量结果与经典理论和实验观察相一致,表明ECT方法可以定性与定量测定流化床内气固两相流动过程固相体积分数。In view of the complex gas-solid flow characteristics in the fluidized bed for coal clean conversion process, the solids volume fraction distribution of glass beads and resin was investigated by electrical capacitive tomography (ECT) in the fluidized bed. The results showed the instantaneous solids volume fraction isogram at different time could be used to quantitatively detect the particle distribution in the cross section. The local time-averaged solids volume fraction was symmetrically distributed along the radial direction, and the solids volume fraction was higher in the near wall region, whilst lower in the center of the bed. Also, the time-averaged solid volume fraction in the cross section was distributed along the axial direction, and the solids volume fraction was higher in the lower place, whilst lower in the upper place. The measured distribution was consistent with the classical theory and experimental observation, which indicated that the ECT method could quantitatively and qualitatively determine the solids volume fraction of gas-solid flow process in the fluidized bed.

关 键 词：流化床 气固两相流 电容层析成像 瞬时固相体积分数 时均固相体积分数 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] O359[自动化与计算机技术—计算机科学与技术]