Improving coal recovery from longwall top coal caving
MetadataShow full item record
This paper develops a series of methodologies to improve the recovery rate from longwall top coal caving. Cavability of top coal is the most essential indicator to estimate the recovery rate. Some influencing factors of cavability such as unconfined compressive strength, abutment pressure and thickness of top coal are primarily analysed to provide cavability assessment. The methodologies of how to determine the most effective drawing interval and cutting to drawing height ratio are developed to improve the recovery rate of top coal. Drawing interval can be determined as the advancing distance of hydraulic support between two caving processes. Both drawing interval and cutting to drawing height ratio can be artificially altered to the optimized value to improve the recovery rate. Three blasting patterns including five-hole scheme, rectangular scheme and triangular scheme are analysed to determine the most effective pattern for top coal caving. Arch structure formed in the caving process is another reason of causing a low recovery rate. In order to improve the recovery rate, a new method of vibration technique is analysed in this paper to break the arch structure.
Showing items related by title, author, creator and subject.
Surovtseva, Daria (2010)According to the Intergovernmental Panel on Climate Change Fourth Assessment Report (IPCC AR4), fossil fuels are utilised to produce more than 80% of the world's energy and this is likely to remain unchanged in the nearest ...
CO<inf>2</inf>Wettability of Shales and Coals as a Function of Pressure, Temperature and Rank: Implications for CO<inf>2</inf>Sequestration and Enhanced Methane RecoveryArif, M.; Barifcani, Ahmed; Zubair, T.; Lebedev, Maxim; Iglauer, Stefan (2016)© 2016, Society of Petroleum Engineers. The underground geological CO 2 storage into oil and gas reservoirs and/or saline aquifers is a promosing technique to reduce anthropogenic greenhouse gas emissions which thus ensures ...
Feng, D.; Aldrich, Chris (2005)Two preconditioning methods, namely, ultrasonication and high-intensity conditioning in an agitated vessel, were compared as a means for improving the flotation of oxidized coal. The use of reconditioning by ultrasound ...