Pressure fluctuation signal analysis of two-component biomass and quartz sand particles based on Hilbert-Huang transform in fluidized-bed

doi:10.11949/j.issn.0438-1157.20141393

Abstract

Abstract:

The Hilbert-Huang transform method was used to analyze the differential pressure fluctuating signal in fluidized-bed, and the flow characteristics under different percentages of biomass and different gas velocities were investigated. With biomass percentage of 2%, marginal spectrum and energy percentage were analyzed at different gas velocities. The frequency of differential pressure fluctuating signals mainly concentrated in the low frequency band (0-5 Hz) and transfer of high frequency IMF energy percentage to middle frequency was found with the increase of gas velocity. With 1.01 m·s^-1gas velocity, the energy of differential pressure fluctuating signals at different biomass percentages was extracted. Transfer of middle frequency IMF energy percentage to high frequency was found with the increase of biomass percentage. The flow state in fluidized-bed was analyzed through the flow-visualized images recorded by high-speed camera. Research results could provide useful experimental evidence for the further study in gas-solids two-phase flow in fluidized-bed.

Key words: fluidized-bed, pressure fluctuation, Hilbert-Huang transform, instantaneous frequency, biomass, numerical analysis

摘要：

采用Hilbert-Huang变换方法对流化床内的压差脉动信号进行分析,研究了不同工况下生物质和石英砂双组分颗粒的流动特征。在生物质质量分数为2%情况下对不同气速下压差脉动信号进行边际谱和能量分析,发现压差脉动信号频率主要集中在低频段(0～4 Hz),随气速的增加各阶IMF能量逐渐从高频段向中频段转移;在气速为1.01 m·s^-1情况下对不同生物质质量分数下的压差脉动信号进行能量分析,发现随生物质质量分数增加各阶 IMF能量逐渐从中频段向高频段转移;并借助高速摄影仪对流化床内的颗粒流动状态进行研究分析。结果为进一步研究流化床内气固两相流知识提供一定的理论依据。

关键词: 流化床, 压力脉动, Hilbert-Huang变换, 瞬时频率, 生物质, 数值分析

CLC Number:

TQ051

ZHAO Kai, ZHONG Zhaoping, WANG Xiaoyi, WANG Zeyu. Pressure fluctuation signal analysis of two-component biomass and quartz sand particles based on Hilbert-Huang transform in fluidized-bed[J]. CIESC Journal, 2015, 66(4): 1282-1289.

赵凯, 仲兆平, 王肖祎, 王泽宇. 基于HHT法的流化床内生物质和石英砂双组分颗粒压差脉动信号分析[J]. 化工学报, 2015, 66(4): 1282-1289.

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