Experimental Study on Coal Sample's Methane Desorption Law in Different Adsorption Balance Pressures

Abstract:

Taking 7 group anthracite coal samples which size is 1¡«3mm from different coal mines of the same mine field as research objects, there carried coal samples' methane adsorption and desorption experiment under the condition of about 1Mpa¡¢2Mpa¡¢3Mpa¡¢4Mpa adsorption equilibrium pressures and adsorption equilibrium temperature 20¡æ. The coal samples' cumulative methane desorption volume of each minute were measured in the initial 30 minutes time, and there obtained the desorption data. Based on experimental data analysis found that the methane desorption law between cumulative methane desorption volume and desorption time is fit to SUN Chong-xu Formulate (Q=atⁱ). Then aimed to the same coal sample, the desorption eigenvalues of different adsorption equilibrium pressures were studied using SUN Chong-xu Formulate based on the experiment data. The study results show that the coal sample's desorption eigenvalues of different adsorption equilibrium pressures keeps a constant, and the average eigenvalues is 0.237 for these experiment samples. Then 1~3mm size coal samples can be used to determent methane content when the loss time less than 8 minutes.

• Periodical: Advanced Materials Research (Volumes 798-799)
• Pages: 201-206
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.798-799.201
• Online since: September 2013
• Authors: Shu Tong Zhang
• Keywords: Coal Samples, Desorption Eigenvalues, Different Adsorption Balance Pressures, Methane Desorption Law, SUN Chong-Xu Formulate

References

[1] Hu Qianting, Zou Yin-hui, Wen Guangcai, et al. New technology of outburst danger prediction by methane conten [J]. Journal of China Coal Society, 2007，32（3）：276-280.

[2] Fan Zhangqun. Current status and developing trend of CBM desorption study [J]. China Coalbed Methane, 2008，5（4）：6-10.

[3] Zou Yin-hui, Zhang Qinghua. Technical progress of direct measurement method for coal-seam methane content in our coal mines, [J]. Ming Safety & Environment Protection, 2009，36（Z）: 180-182.

[4] Wang Yaofeng. Study on the measurement of coal seam primitive methane content and the influencing factors of its error [D]. Fu'xin: LIAONING TECHNICIAL UNIVERSITY, 2004: 3-7.

[5] He Xueqiu, Zhang Li. Study on influence and mechanism of methane adsorption and desorption in electromagnetic fields exerted, [J]. Journal of China Coal Society, 2000，25（6）：614-617.

[6] Gou Faxian, Jia Cuizhi, Yang Puguang. Researah into the deduced content loss of methane making use of the direct coal-bed methane content measurement, [J]. Safety in Coal Mines, 1997（7）：9-11.

[7] CHEN Xiang-jun, WANG Zhao-feng, YANG Hong-min, XIAO Dong-hui. Research on the methane desorption law of the consumingly destruct coal [J]. JOURNAL OF COAL SCIENCE & ENGINEERING, 2008, 14(2): 263-266.

DOI: 10.1007/s12404-008-0056-7

[8] Wang Yaofeng, Li Chengwu, Jia Yanwu, et al. Variation characteristics of parameters in the progress of coal seam methane content determination, [J]. Safety in Coal Mines, 2005，36（12）: 56-57.

[9] R. J. Bielicki, J. H. Perkins, and F. N. Kissell. Methane Diffusion Parameters for Sized Coal Particles: A Measuring Apparatus and Some Preliminary Results [R], Bureau of Mints Report of Investigations, (1972).

[10] Shutong Zhang. Experiment on small size coal sample's Methane desorption law based on Sun Chong-Xu Formula [A]. First International Symposium on Mine Safety Science and Engineering [C], (2011).

DOI: 10.1016/j.proeng.2011.11.2164