烟煤
液氮
传热
煤
氮气
收缩率
热导率
化学
大孔隙
孔隙水压力
热力学
矿物学
材料科学
复合材料
岩土工程
介孔材料
地质学
有机化学
物理
催化作用
生物化学
作者
Lei Qin,Siheng Lin,Haiqing Lin,Zitong Xue,Weikai Wang,Xian Zhang,Shugang Li
出处
期刊:Energy
[Elsevier]
日期:2023-01-01
卷期号:263: 125905-125905
被引量:7
标识
DOI:10.1016/j.energy.2022.125905
摘要
The content and distribution of pore unfrozen water directly reflect the coal thawing process. It is the key to break through the evolution of coal pore structure under low temperature to study the pore ice melting speed. Taking bituminous coal in Yuan Zhuang, China as the research object, this paper studied pore thawing characteristics of coal samples with different liquid nitrogen freezing time through nuclear magnetic resonance technology. The experimental results clearly demonstrate that appropriate liquid nitrogen freezing time could greatly expand the macropore of bituminous coal, while the expansion effect of micropore and mesopore was less affected by the freezing time. As the freezing time increased, the pores and pore throats of saturated bituminous coal underwent two phases of ice-water transition expansion and liquid nitrogen low-temperature shrinkage. There were differences in the local thermal conductivity of coal samples with different liquid nitrogen freezing time, resulting in different thawing speeds of pore water at the same thawing temperature. When the freezing time increased, the thermal conductivity of coal samples increased due to the pore freezing shrinkage, which can greatly improve the thawing speed of coal samples.
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