Adsorption-desorption characteristics for China coal of various ranks
Based on isothermal absorption experiments under equilibrium moisture conditions, the test of vitrinite reflectance and maceral identification on China coal of various ranks (maximum reflectance of vitrinite, Ro.max between 0.35%～8. 6%), we analyzed the relationships between Langmuir volume and coal rank, equilibrium moisture, maceral, and found that the relationship between Langmuir volume and coal rank can be divided into two phases. When Ro, max is less than about 4. 0%, the Langmuir volume increases with coal rank. On the contrary, if Ro, max is more than about 4. 0%, the Langmuir volume will decrease. At the same time, the Langmuir volume of low rank roal is also affected by maceral. According to the desorption experiments of coal core, adsorption time, critical desorption pressure and theoretical recovery ratio on coal of North China have been calculated, and desorption ratio of coal in various ranks has been discussed in this article. On the basic of the above researchs, according to the analysis of absorption properties and mechanism of coal, mathematic model of the relationship between Langmuir volume and coal rank has been established, and variance of absorption characteristics between low rank and middle-high rank coal has been discussed. Therefore, we have concluded that the average recovery ratio of coal in China is about 34. 2%, equivalent with desorption rate (34.1%)calculated by means of the desorption experiments of coal core.
isothermal absorption ezperiment Langmuir volume Coal rank Average recovery ratio
X. H. Fu J.Y.Wang B. Quan R. F. Zhou J. Shen
School of Resource & Geoscience, China University of Mining & Technology, Xu Zhou, 221008, Jiangsu, Chinas Key Laboratory of CBM Resources and Dynamic Accumulation Process, China University of Mining and Technology, Ministry of Education
国际会议
徐州
英文
47-57
2009-09-24（万方平台首次上网日期，不代表论文的发表时间）