Effect of surface roughness of Chinese sub-bituminous coal on the kinetics of three-phase contact formation

Effect of surface roughness of Chinese sub-bituminous coal on the kinetics of three-phase contact formation
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中国次烟煤表面粗糙度对三相接触形成动力学的影响

DOI:
10.1016/j.fuel.2017.12.053
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发表时间:
2018-03
期刊:
影响因子:
7.4
通讯作者:
Tao Xiuxiang
Tao Xiuxiang
中科院分区:
工程技术1区
文献类型:
--
作者:
Wang Shiwei;Guo Jifeng;Tang Longfei;He Huan;Tao Xiuxiang

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本文研究了不同表面粗糙度的低阶煤表面三相接触线(TPC)的末端直径和扩展速度。为了消除低阶煤颗粒亲水表面的不均匀性影响,采用低灰分含量的实验样品。此外,XPS分析结果表明,低阶煤表面亲水矿物颗粒很少。此外,从SEM和AFM测量分析可以看出,低阶煤表面的不同局部区域存在许多不同尺寸(高度和宽度)的缝隙(柱子、突起)。因此,低阶煤表面的三相接触线呈现出不同的润湿行为。结果表明,低阶煤样表面粗糙度增大,润湿膜直径变小,三相接触线扩展速度加快。
In this paper, terminal diameter and expansion velocity of the three-phase contact (TPC) line on the low-rank coal surfaces with different surface roughness were investigated. To eliminate the heterogeneity effect on the hydrophilic surfaces of low-rank coal particles, experimental samples with low ash content were adopted. Moreover, the analysis result of XPS indicated that there were few hydrophilic mineral particles on the low-rank coal surface. Furthermore, from the analyses of SEM and AFM measurements there are many crevices (pillars, protrusions) of different sizes (height and width) in different local areas of low-rank coal surfaces. Therefore, the three-phase contact lines on the low-rank coal surfaces presented different wetting behaviors. It demonstrated that the wetting film diameter became smaller and the expansion velocity of the three-phase contact line was faster while the surface roughness of low-rank coal samples increased.
DOI: 10.1016/j.mineng.2005.09.026
发表时间: 2006-05
影响因子: 4.8
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