振动热压脱水过程中褐煤孔结构变化规律研究

doi:10.11799/ce201509041

煤炭工程 ›› 2015, Vol. 47 ›› Issue (9): 127-130.doi: 10.11799/ce201509041

振动热压脱水过程中褐煤孔结构变化规律研究

张一昕¹,王彬彬¹,马江¹,王双超¹,刘志佳¹,尚晓玲¹,武建军²,司崇殿¹

1. 中国矿业大学
2. 中国矿业大学化工学院

收稿日期:2014-09-10 修回日期:2014-11-13 出版日期:2015-09-11 发布日期:2015-10-09
通讯作者: 张一昕 E-mail:zhangyixinchina@126.com
基金资助:
国家重点基础研究发展计划（973计划）资助项目;江苏省普通高校研究生科研创新计划

Study on the Pore Structure Variation of Lignite during Vibration Mechanical Thermal Expression Dewatering Process

Received:2014-09-10 Revised:2014-11-13 Online:2015-09-11 Published:2015-10-09

摘要/Abstract

摘要： 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。

关键词: 褐煤, 孔结构, 脱水, 振动机械热压

Abstract: Basic on vibration mechanical thermal expression dewatering experiments, effects of temperature, pressure and vibration force on the pore structure variation of lignite were studied. The porosity of lignite decreased with increasing temperature, pressure and vibration force. The increase of vibration force in a special range (1-4 kN) resulted in more severe reduction of porosity of lignite than that out of the range. The pore size distributions of lignite were significantly changed by vibration mechanical thermal expression dewatering process. The pores filled with water collapsed and developed to smaller pores as water being gradually removed with increasing temperature and pressure, resulted in the severe reduction of inter-particle pores and macro-pores and slightly increase of meso-pores. The inter-particle pores also could be reduced by the more closely arrangement of particles and the change of particle structure caused by vibration force. The mean pore diameters of lignite significantly decreased with the increase of temperature and pressure. The specific surface areas of lignite slightly decreased under 100 ℃ and 5MPa, and then slightly increased. The vibration force had little effect on mean pore diameters and specific surface areas of lignite.

Key words: lignite, pore structure, dewatering, Vibration Mechanical Thermal Expression

中图分类号:

TD94

张一昕,王彬彬,马江，等. 振动热压脱水过程中褐煤孔结构变化规律研究[J]. 煤炭工程, 2015, 47(9): 127-130.

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振动热压脱水过程中褐煤孔结构变化规律研究

Study on the Pore Structure Variation of Lignite during Vibration Mechanical Thermal Expression Dewatering Process

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