Effect of operating conditions on drying of Chinese lignite in a vibration fluidized bed

Effect of operating conditions on drying of Chinese lignite in a vibration fluidized bed
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振动流化床操作条件对褐煤干燥的影响

DOI:
10.1016/j.fuproc.2014.07.014
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发表时间:
2014-12
影响因子:
7.5
通讯作者:
et al
et al
中科院分区:
工程技术1区
文献类型:
--
作者:
Zhao P F;Zhao Y M;Luo Z F;et al

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在实验室规模的振动流化床干燥器中研究了中国褐煤颗粒在各种操作条件下的干燥性能:进气温度(120 - 200 ° C),表观空气流速(1.5Umf(最小流化速度)-2.2Umf)、频率(10 - 50 Hz)、振幅(1 - 5 mm)、粒径(0.5 - 6 mm)和床层高度(20 - 60 mm)。干燥结果表明,较高的温度、较大的风速、较高的频率和振幅(不能太高)、较小的粒径和较低的床层高度有利于干燥。Midilli-Kucuk模型提供了这些干燥结果的最佳拟合,并进一步暗示,褐煤的水分迁移主要是由内扩散控制。与普通流化床干燥器相比,气振流化床干燥器的干燥特性得到改善。此外,干燥动力学在很大程度上取决于振动的频率和振幅。
The drying performance of Chinese lignite particles in a laboratory scale vibration fluidized bed dryer was investigated under various operating conditions: inlet air temperature (120–200 °C), superficial air velocity (1.5Umf(the minimum fluidization velocity)–2.2Umf,), frequency (10–50 Hz), amplitude (1–5 mm), particle size (0.5–6 mm) and bed height (20–60 mm). The drying results showed that higher temperature, larger air velocity, higher frequency and higher amplitude (not too high), smaller particle size and lower bed height were favorable for drying. The Midilli–Kucuk model provided the best fit of these drying results and further implied that the moisture transfer of lignite was mainly controlled by internal diffusion. In comparison with the case of an ordinary fluidized bed, the gas-vibro fluidized bed dryer exhibited improvement of drying characteristics. Moreover, the drying kinetics was largely dependent on the frequency and amplitude of vibration.
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