基于壁温信号EMD解析的气固流化床结片预警  

Early Warning of Wall Sheeting in Gas-Solid Fluidized Bed Based on EMD Analysis of Wall Temperature

作　　者：张倩[1] 董克增[1] 黄正梁[1] 任聪静[1] 王靖岱[1] 阳永荣[1] 

机构地区：[1]浙江大学化学工程与生物工程学院化学工程联合国家重点实验室,杭州310027

出　　处：《华东理工大学学报（自然科学版）》2016年第2期157-162,270,共7页Journal of East China University of Science and Technology

基　　金：国家自然科学重点基金(21236007);中国博士后科学基金(528000-X91401);浙江省自然科学基金青年基金项目(LQ13B060002);高等学校博士学科点专项科研基金项目(20130101110063)

摘　　要：气固流化床反应器在生产中易产生结片或结块,严重影响反应器的安全稳定运行。对气固流化床中的壁温信号进行经验模态分解(EMD),发现其高频本征模函数IMF1及IMF2在有结片产生时显著增大,其能量的滑动平均值(Em)能有效地指示初始结片的产生。运用主元分析(PCA)方法处理不同样本的Em值,得到结片检测统计量(T2)及结片控制上限(UCL),并进一步提出了判断结片产生的E检测法:当T2<UCL时,流化床内无结片产生;当T2≥UCL时,流化床内有结片产生。工业应用结果表明,与传统的壁温波动判别法和铯源结块探测法相比,E检测法能提前预警结片。Wall sheeting or agglomeration is easy to form during production in gas-solid fluidized bed,which seriously affects the safe and stable operation of the reactor.Wall temperature signals are decomposed by Empirical Mode Decomposition（EMD）method,and the first and second intrinsic mode functions,IMF1 and IMF2,are found to increase sharply when sheets are formed.Furthermore,the moving average value of energy of IMF1 or IMF2（Em）is effective in indicating initial sheeting.By importing Em into Principal Component Analysis（PCA）,the statistical T2 and Upper Control Limit（UCL）are achieved,and the wall sheeting detection method,namely Edetecting method,is proposed：when T2〈UCL,no sheet is formed;when T2≥UCL,sheets are formed.The industrial application results show that,compared with traditional wall temperature fluctuation discriminant or 137 Cs agglomeration detecting method,Edetecting method can achieve early warning of sheeting in advance.

关 键 词：气固流化床 壁温信号 经验模态分解 主元分析 结片 

分 类 号：TQ021.8[化学工程]