Excavation of Coal Using a High Pressure Water Jet System.

摘要

Experiments are described which investigate the potential of high-pressure water jets to act as the cutting unit for a longwall mining machine. The results of the experimentation showed that at lower pressure,larger diameter jet was more effective than the converse,and that the faster the jet was traversed,the more efficiently it mined coal. The contraoscillation of adjacent cutting arms was found to be an effective method of reducing traverse distance. Dual orifice nozzles,with a diverging angle of 20degrees between the jets were found most effective in cutting the coal to provide access for the cutting head.