Effective diffusivity of moisture in low rank coal during superheated steam drying at atmospheric pressure
Effective diffusivity of moisture in low rank coal during superheated steam drying at atmospheric pressure
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DOI：
10.2478/v10176-012-0004-3
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发表时间：
2012-03
期刊：
影响因子：
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通讯作者：
Z. Pakowski;R. Adamski;S. Kwapisz
中科院分区：
文献类型：
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作者：
Z. Pakowski;R. Adamski;S. Kwapisz
实验测定了Bejchatów矿褐煤中水分的有效扩散系数。实验在200°C和大气压下在过热蒸汽中使用略微压缩的圆柱形粒料进行。样品的干燥和温度曲线用于确定扩散率。反问题，制定和解决的三维轴对称圆柱形几何形状的样品的有限元方法。模拟曲线与实验结果吻合较好。所得的有效扩散系数与含水率和温度的关系可用于褐煤干燥器的设计。
The effective diffusivity of water in brown coal of Bełchatów mine was experimentally determined. The experiments were performed in superheated steam at 200°C and atmospheric pressure using slightly compressed pellets of cylindrical shape. The drying and temperature curves of the sample were used to identify diffusivity. An inverse problem was formulated and solved by the finite element method for 3D axially symmetric cylindrical geometry of the sample. A satisfactory fit of the simulated curves to experimental results was obtained. The obtained dependence of effective diffusivity on moisture content and temperature may be used in designing lignite dryers.