基于声信号的气固流化床塌落过程研究  

Study on collapse process in gas-solid fluidized bed based on acoustic signals

作　　者：韩笑[1] 周业丰[1] 黄正梁[1] 顾玉彬[1] 王靖岱[1] 俞欢军[1] 阳永荣[1] 

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

出　　处：《浙江大学学报（工学版）》2014年第3期527-534,共8页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(21176207);国家"973"重点基础研究发展规划资助项目(2012CB720500);2011年度高等学校博士学科点专项科研基金资助项目(20110101120020);浙江省自然科学基金青年基金资助项目(LQ13B060002)

摘　　要：使用声发射技术研究Geldart A/B/D类型颗粒的气固流化床塌落过程,根据声能量随时间变化曲线的特征,提出判别颗粒Geldart类型的判据,即A类颗粒的床层底部声能量曲线存在恒速下降的线性脱气段,而B、D类颗粒则不存在线性脱气段.进一步,结合Hilbert-Huang变换(HHT),分析塌落过程的声发射信号,获得塌落过程中声信号的边际谱,揭示了不同Geldart类型颗粒在塌落过程中的运动特性:A类颗粒与壁面间的碰撞比较强烈,而D类颗粒仅与壁面发生摩擦,B类颗粒介于A、D类颗粒之间.实验结果表明,结合HHT分析的声发射技术可用于气固流化床中流体力学的测定.Acoustic emission（AE）technique was used to study the collapse processes of Geldart＇s group A/B/D particles in a gas-solid fluidized bed.According to characteristics of the variation curves of acoustic energy,a criterion to distinguish the Geldart＇s group classification was presented.The variation curve of the acoustic energy at the bottom bed with time for Group A particles showed a linear degassing segment, but there was no linear degassing segment for Group B/D particles.Furthermore,based on Hilbert-Huang transform（HHT）analysis,the marginal spectrum of AE signals was obtained during the collapse processes and the particle motion behavior during collapse processes of Group A/B/D particles were revealed.Group A particles collide with the wall frequently while there are only friction interaction for Group D particles, and the movement characteristic of Group B particles is between Group A particles and Group D particles. The experimental results show that the acoustic emission（AE）technique based on HHT analysis is feasible for determining hydrodynamics of gas-solid fluidized beds.

关 键 词：气固流化床 床层塌落 声发射 Geldart分类 HILBERT-HUANG变换 

分 类 号：TQ021[化学工程]