Influence Mechanism of Coal Crack Development on Coal Biogasification Under the Influence of Mining
- PDF / 658,740 Bytes
- 9 Pages / 595.276 x 790.866 pts Page_size
- 82 Downloads / 219 Views
Original Paper
Influence Mechanism of Coal Crack Development on Coal Biogasification Under the Influence of Mining Dong Xiao ,1,7 Mohamed Keita,2 Hailun He,3,7 Enyuan Wang,4 Yidong Zhang,1 Huan He,5 and Jing Ma6 Received 16 July 2020; accepted 3 September 2020
To study the regularity of anaerobic fermentation in coal during coal crack development, a series of tests and analyses was carried out. Test objects included dynamic air percolation with crack evolution, influence of changes in specific surface area, and rate of O2 percolation on anaerobic fermentation. The key factors affecting anaerobic fermentation at different zones of coal seam during crack development were analyzed. Data confirmed that the level of crack development in coal is positively correlated with coal permeability and effect of air diffusion in the cracks. Meanwhile, results showed that the anaerobic condition could be maintained when O2 percolation is lower than 3000 ppm with the effect of O2 consumption by the facultative anaerobes. Furthermore, the coal seam can be divided into “anaerobic fermentation inhibit zone” and “anaerobic fermentation zone” and it can be separated by a biological anaerobic interference interface. In the anaerobic fermentation inhibit zone, coal biogasification can be inhibited by air percolation, and change in O2 condition was the critical control factor. In the anaerobic fermentation zone, the increase in specific surface area was the critical control factor to enhance the efficiency of coal biodegradation. This research has engineering guiding significance for revealing the influence of coal fragmentation on coal biogasification in the stress concentration zone of the mining area. KEY WORDS: Coal, Crack development, Percolation, Anaerobic fermentation, Methanogenic consortia, Biogasification.
INTRODUCTION
1
State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116 Jiangsu, China. 2 School of Mines, China University of Mining and Technology, Xuzhou 221116 Jiangsu, China. 3 School of Life Science, Central South University, Changsha 410083 Hunan, China. 4 School of Safety Energy, China University of Mining and Technology, Xuzhou 221116 Jiangsu, China. 5 School of Chemical Energy and Technology, China University of Mining and Technology, Xuzhou 221116 Jiangsu, China. 6 Low Carbon Energy Institute, China University of Mining and Technology, Xuzhou 221116 Jiangsu, China. 7 To whom correspondence should be addressed; e-mail: [email protected], [email protected]
Coalbed methane (CBM) is both an unconventional natural gas resource and a major hazard in mining (Xiao et al. 2013; Li et al. 2018). It is composed of biogenic gas and thermogenic gas. Biogenic gas is the final product yielded by methanogenic consortia through anaerobic metabolism (Stra¸poc´ et al. 2008). Strict anaerobic environment is required for methanogen and other strict anaerobic microbes (Green et al. 2008; Xiao 2010). Therefore, the condition of the anaerobic environment, which could affect anaerobi
Data Loading...
