Abstract
High-voltage electrical pulse (HVEP) technology is a useful method to improve the pore structure of coal. However, the breakdown voltage of coal is very high; therefore, it is necessary to improve the conductivity of coal first to decrease its breakdown voltage before subjecting it to HVEP. In this work, a solution of NaCl was used for ameliorating the conductivity of Linhua anthracite coal and Hongliu bituminous coal. Both breakdown voltage and energy consumed by the coal sample saturated with the solution of NaCl decreased. The breakdown voltage of Linhua and Hongliu raw coal sample (RCS) was 3.44 and 2.88 times that of coal saturated with NaCl, respectively. The energy consumed by Linhua and Hongliu RCS was 11.82 and 8.21 times that of coal saturated with NaCl solution, respectively. Scanning electron microscopy images showed that the surface cracks on crushed coal samples after saturating with NaCl solution were more than those on RCS. Nuclear magnetic resonance results indicate that meso- and macropo...
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