A field demonstration of the JOY Wet-Head Miner (WHM) technology was performed at a Southern Illinois mine. The WHM technology utilizes sprays mounted behind each bit to reduce ignition potential and increase bit life by cooling the "hot-spots" and the bit itself and reduce respirable dust by controlling dust generation at the source. The study was conducted in three phases. In Phase I, limited pilot studies were conducted on the standard miner and the WHM to determine the variability in measurements and to formulate a scientific test plan for more elaborate studies in Phase II and Phase III. In Phase II studies, sampling was conducted to obtain statistically significant comparisons of the WHM with the standard miner. Phase III studies were aimed at improving the performance of the WHM by modifying the sprays on the miner with respect to the pressures and locations. Bit usage and productivity of the WHM and the standard miner were also monitored throughout the testing. The results of these studies indicate that the WHM technology significantly improves visibility and appears to reduce respirable dust to a limited extent in and around the face area. It also appears that there is a significant improvement in bit life due to the cooling effect of the wet-head water sprays. The industrial engineering studies have confirmed that there is no impact on productivity from WHM use. Overall, improvements in visibility, reduction in bit usage and the ignition control benefits related to the use of WHM have the potential to improve mine productivity and profitability which in turn should improve coal competitiveness and the health and safety of miners.
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