摘要
为研究煤经过热处理后孔隙结构的变化,通过低场核磁共振(NMR)技术,获得不同温度处理的煤岩横向弛豫时间,根据不同横向弛豫时间的信号强度分析了不同孔径的孔隙含量,进而得出孔隙特征随温度的变化规律。利用体视镜获得表面的微观照片,以Matlab数字图像处理法辅助观察煤岩表面变化过程与加热后的现象。对核磁数据进行了分形分析,获得各孔径区间的分形维数D_(x)与整体分形维数D_(NMR)。结果表明:微孔对D_(NMR)的影响最大,呈正比关系,而与温度、总孔隙度相关性不大。
In order to study the changes in the pore structure of coal after heat treatment,low-field nuclear magnetic resonance(NMR)technology was used to obtain the transverse relaxation time of coal treated at different temperatures.According to the signal intensity of different transverse relaxation time,the pore content of different pore diameters was analyzed,and then the law of pore characteristics changing with temperature was obtained.Stereoscope was used to obtain microscopic photos of coal surface,and Matlab digital image processing method was applied to assist in observing the surface change process and phenomenon after heating.Fractal analysis was performed on the nuclear magnetic data,and the fractal dimension D_(x) of each aperture interval and the overall fractal dimension D_(NMR) were obtained.The results show that,micropores have the greatest influence on D_(NMR),which is proportional to each other,but has little correlation with temperature and total porosity.
作者
胡鑫
王超勇
孙强
董再田
HU Xin;WANG Chaoyong;SUN Qiang;DONG Zaitian(School of Resources and Geosciences,China University of Mining and Technology,Xuzhou,Jiangsu 221008,China;School of Geology and Environment,Xi’an University of Science and Technology,Xi'an,Shaanxi 710054,China)
出处
《矿业研究与开发》
CAS
北大核心
2021年第11期67-75,共9页
Mining Research and Development
基金
国家自然科学基金项目(41772129,41502156)
西安科技大学优秀青年科技基金项目(2018YQ2.08)
