摘要
为研究低温液氮作用后煤体的瓦斯吸附特征及机理,本文利用高压吸附仪测试了液氮冻结前后煤体的瓦斯吸附能力,结合红外光谱仪和视频光学接触角测量仪,研究了低温液氮冻结对无烟煤表面官能团和接触角的改造规律.结果表明:单次液氮冻结100 min可降低煤体瓦斯吸附能力;随着液氮冻结时间增加,不同官能团之间相互转换,煤体的接触角减小.分析得出,煤体的瓦斯吸附量与变质程度呈“U”形变化趋势;含氧官能团的含量与液氮冻结时间正相关,脂肪烃类官能团的含量与液氮冻结时间负相关;—OH和—COOH的含量对煤体的润湿性具有促进作用.基于以上研究,本文进一步探讨了低温液氮处理后煤体的增透及瓦斯吸附机理.
In order to study the characteristics and mechanism of coal gas adsorption by low-temperature liquid nitrogen,this paper used a high-pressure adsorption instrument to test the gas adsorption capacity of coal before and after liquid nitrogen freezing,combined with infrared spectrometer and video optical contact angle measuring instrument,to study the effect of low-temperature liquid nitrogen freezing on the modification of anthracite surface functional groups and contact angles.The results show that a single freeze of liquid nitrogen for 100 minutes reduces the gas adsorption capacity of the coal;as the freezing time of liquid nitrogen increases,different functional groups are converted to each other;the contact angle of coal decreases.The analysis shows that the amount of coal gas adsorption and the degree of deterioration show a“U”-shaped trend;the content of oxygen-containing functional groups are positively related to the freezing time of liquid nitrogen,and the content of aliphatic hydrocarbon functional groups is negatively related to the freezing time of liquid nitrogen;the content of—OH and—COOH can promote the wettability of coal.Based on the above research,this paper further discusses the permeability enhancement and gas adsorption mechanism of coal after low temperature liquid nitrogen treatment.
作者
秦雷
王平
林海飞
李树刚
赵鹏翔
马超
QIN Lei;WANG Ping;LIN Haifei;LI Shugang;ZHAO Pengxiang;MA Chao(College of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an,Shaanxi 710054,China;Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education,Xi'an University of Science and Technology,Xi'an,Shaanxi 710054,China)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2022年第5期914-922,共9页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(51904237)
中国博士后科学基金面上项目(2019M653875XB)
中国博士后科学基金特别资助项目(2020T130522)
关键词
低温液氮
瓦斯吸附
官能团
接触角
吸附机理
cryogenic liquid nitrogen
gas adsorption
functional group
contact angle
adsorption mechanism
