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煤炭工程  2015 

振动热压脱水过程中褐煤孔结构变化规律研究

DOI: 10.11799/ce201509041, PP. 127-130

Keywords: 褐煤,孔结构,脱水,振动机械热压

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Abstract:

研究了褐煤振动机械热压脱水过程中,温度、机械压力、振动力作用下褐煤孔隙率、孔径分布、平均孔径与比表面积的变化规律。结果表明,温度、压力、振动力的升高均能有效降低褐煤的孔隙率,但褐煤对振动力存在响应范围。随着温度和压力的升高,褐煤失去水分后孔会发生坍塌并演变成较小尺寸的孔,导致颗粒间孔与大孔显著降低,而中孔略有增加;振动力可使颗粒间排列更紧密,破坏褐煤颗粒结构,改变褐煤孔径分布。褐煤平均孔径随温度和机械压力的升高大幅降低,比表面积先略有降低,在100℃和5MPa之后又略有增加,振动力对褐煤平均孔径和比表面积的影响较小。

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