摘要
循环流化床基础和应用近几年来受到了越来越多的关注,针对流化床壁面颗粒团返混流动现象区分稀密相区的应用要求,利用声发射技术研究了不同流化风量和床料粒径下流化床同一位置和不同位置点的流动特性。首先:将声发射信号进行傅里叶小波包分解并分析特征能量尺度;其次:根据能量尺度确定流化床壁面流动状态,并且根据频率段能量特征确定流化效果,得到粒径颗粒完全混合程度下的最大"返混上升高度"为75~90cm之间,为循环流化床区分稀密相区提供一定的实验数据和理论支撑。
Circulating fluidized bed is basic and applied by being focus on more and more in recent years, and in view of the fluidized bed surface backmixing particles group phenomenon is to distinguish the flow in dilute dense-phase application requirements, so the acoustic emission technique was used to study the fluidized bed under different fluidized bed material particle size and wind that has the same position and the flow characteristics of different points. Acoustic emission signals of the Fourier Ye Xiaobo packet is decomposed and analyzed the characteristics of energy, secondly using the energy scale of fluidized bed wall confirms flow state, and according to the frequency energy characteristics determines the fluidization effect, geting the maximum particle size of particles under the completely mixed degree ＂backmixing higher level＂ of 75 - 90 cm, in order to distinguish thin dense-phase area of circulating fluidized bed provides a certain amount of experimental data and theoretical support.
出处
《锅炉技术》
北大核心
2017年第4期35-39,共5页
Boiler Technology
基金
国家自然科学基金(51666015)
内蒙古自治区自然科学基金项目(2015MS0549)
关键词
循环流化床
冷态
声发射
壁面流动
小波包
返混上升高度
Circulating Fluidized Bed
cold
acoustic emission
wall flow
waveletpacket
backmixing higher level
作者简介
李帅（1990-），男，主要从事循环流化床技术的研究。
