Abstract
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.
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