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Analysis of the pressure fluctuations in binary solids circulating fluidized bed

机译：二元固体循环流化床压力波动分析

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Pressure fluctuations are often selected to analyze the dynamic changes in the fluidized bed. Many researchers in the field of fluidization have adopted many methods to analyze the pressure signals in fluidized beds, such as statistical analysis (in time domain), frequency analysis (in frequency domain) and nonlinear analysis (such as chaotic method). There are many literatures concentrated on statistical analysis in the fluidization field since this method can display the distribution density of the pressure fluctuations. In this study, the pressure fluctuations on the bed wall at different bed heights in the cold two dimensional (2-D) circulating fluidized bed (200 x 30 x 1200 mm~3) were sampled. The colophony, millet and 20% millet plus 80% colophony were selected as bed materials. The pressure signals were analyzed by means of statistical methods. The correlation equations between the pressure signals and fluidization parameters were obtained under different operational conditions. Finally, comparisons between the single solid and binary solids 2-D circulating fluidized beds were investigated deeply. Two parameters, K_1 (=0.54(u - u_(mf))~(0.4) h~(0.8)/g~(0.2)) and K_2 (=σ_b/(ρ_sg(1 - ε_(mf)))), were selected to characterize the fluidization mechanism. It was found that the relationships between K_2 and K_1 among the single solid and binary solids circulating fluidized beds vary a great deal.
机译：通常选择压力波动来分析流化床中的动态变化。流化领域的许多研究人员已经采用了许多方法来分析流化床中的压力信号，例如统计分析（在时域中），频率分析（在频域中）和非线性分析（例如混沌方法）。由于这种方法可以显示压力波动的分布密度，因此有许多文献集中在流化领域的统计分析上。在这项研究中，对冷二维（2-D）循环流化床（200 x 30 x 1200 mm〜3）中不同床高的床壁压力波动进行了采样。选择了松香，小米和20％的小米加80％的松香作为床料。通过统计方法分析压力信号。得到了不同工况下压力信号与流化参数之间的相关方程。最后，深入研究了单固体和二元固体二维循环流化床的比较。两个参数K_1（= 0.54（u-u_（mf））〜（0.4）h〜（0.8）/ g〜（0.2））和K_2（=σ_b/（ρ_sg（1-ε_（mf）））），选择来表征流化机理。发现单一固体和二元固体循环流化床中K_2和K_1之间的关系变化很大。

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