隔板式内循环流化床压力脉动信号递归分析  

Recurrence analysis of pressure fluctuations inclapboard-type internally circulating fluidized bed

作　　者：张兵 魏利平[1,2] 滕海鹏[1] ZHANG Bing;WEI Liping;TENG Haipeng(School of Chemical Engineering,Northwest University,Xi’an 710069,Shaanxi,China;Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy,Northwest University,Xi’an 710069,Shaanxi,China)

机构地区：[1]西北大学化工学院,陕西西安710069 [2]西北大学陕北能源先进化工利用技术教育部工程研究中心,陕西西安710069

出　　处：《化工学报》2020年第S01期106-113,共8页CIESC Journal

基　　金：国家自然科学基金项目(51606153);陕西省教育厅科研计划项目(18JK0800)。

摘　　要：隔板式内循环流化床中流化态及颗粒循环特性对压力脉动信号特征具有重要影响,其作用机制尚未完全清楚。测量了隔板式内循环流化床在不同气速比条件下的压力脉动信号,通过时域及递归分析,获得了压力脉动信号的标准差、递归率、确定性及香农熵等特征参数。结果表明,随着表观气速比的增加,内循环中颗粒循环状态存在未循环、鼓泡循环、过渡循环和湍动循环四个阶段;通过压力脉动信号的标准差、递归图黑白结构占比和递归特征参数可识别这四种循环状态,递归特征参数在不同循环区域内显示出良好的线性关系,可用于识别隔板式内循环流化床系统的循环状态。The complex and unclear effects of fluidization and solid circulation within a clapboard-type internally circulating fluidized bed on the pressure fluctuations needs to be further investigated to clarify the basic mechanism.The present work measured the pressure fluctuation signals at different gas velocity ratios,and analyzed which by time domain and recurrence analysis methods.The characteristic parameters of standard deviation,recurrence rate,determinism and Shannon entropy were obtained.It was observed four states of no circulation,bubbling circulation,transition circulation and turbulent circulation with an increase in superficial gas velocity ratio.The four circulation states can be identified by the standard deviation of the pressure pulsation signal,the black-and-white structure proportion of the recurrence plot and recurrence characteristic parameter.Recurrence characteristic parameters show good linear relation in different circulation regions,which can be used to characterize the circulation states of the internally circulating fluidized bed system.

关 键 词：内循环流化床 两相流 二元混合物 递归图 递归量化分析 

分 类 号：TQ530.2[化学工程—煤化学工程]