Abstract
Abstract High pressure waterjets attack, fragment and comminute coal. The purpose of this research is to determine the effect of selected waterjet parameters on the specific energy required to create particles less than 75 μm in size. The selected parameters are waterjet pressure, nozzle diameter, relative velocity between moving coal sample and stationary waterjet nozzle and nozzle standoff distance, defined as the distance between nozzle and target. This information is necessary as a starting point for the design of coal comminution equipment based on waterjet technology. Over 980 individual specimens of bituminous coal from Moberly, Missouri USA, were subjected to controlled attack by waterjet. Trials were executed with waterjet pressures up to 100 MPa, and with nozzle standoff distances between 0.80- to 44.5 × 10−3 m. Nozzle diameters of 1.14-, 0.81 -, and 0.41 × 10−3 m were used, and coal sample feedrates varied up to 0.127ms−1 relative to a stationary nozzle. The most important parameter was found t...
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