Dynamics of Pressure Fluctuation in a Bubbling Fluidized Bed at High Temperature
Dynamics of Pressure Fluctuation in a Bubbling Fluidized Bed at High Temperature
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DOI：
10.1021/ie0200151
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发表时间：
2002-06
影响因子：
4.2
通讯作者：
Q. Guo;G. Yue;J. Werther
中科院分区：
文献类型：
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作者：
Q. Guo;G. Yue;J. Werther
用三种尺寸的骨灰在82 mm-I.D.上进行了动态行为的研究。利用功率谱密度函数(PSDF)分析、混沌分析和小波分析对1000℃以下的不锈钢沸腾床压力波动信号进行了分析。在固定状态下，压力波动信号的主频为20~80赫兹，而在流态化状态下，主频为1~9赫兹。关联维和Kolmogorov熵在固定状态下为零，然后在过渡区随流态化次数的增加而增大。在完全流态化状态下，随着流态化气速的变化，这两个指数变化不大。通过小波变换，可以将床层压力波动信号分解为不同分辨率下的近似和细节。五个细节信号中的峰数代表了气泡形成的频率，这与气泡形成的主要频率是一致的。
Dynamic behaviors were investigated using ashes of three sizes in an 82-mm-i.d. stainless steel fluidized bed at temperatures up to 1000 °C. Pressure fluctuation signals were analyzed using power spectral density function (PSDF) analysis, chaos analysis, and wavelet analysis. The major frequency of the pressure fluctuation signals is in the range from 20 to 80 Hz in the fixed state, whereas the major frequency ranges from 1 to 9 Hz in the fluidized state. The correlation dimension and Kolmogorov entropy are zero in the fixed state, and then they increase with increasing fluidization number in the transition region. Finally, these two exponents vary little with changing fluidization gas velocity in the fully fluidized state. Through a wavelet transform, the fluctuating pressure signals of the bed can be decomposed into approximations and details at different resolutions. The number of peaks in the five-detail signal represents the bubble formation frequency, which is in agreement with the major frequency o...