Analysis of energy conversion efficiency of coal crushed by hydroelectric pulse shock wave

Energy conversion efficiency is one of the most concerned indicators in the practical engineering application of the coal crushing technology. As one of the new technology for coal destruction, there is a relatively lack of investigation on the energy conversion efficiency of electrohydraulic pulsed shockwave (EHD). In order to study the energy conversion efficiency of the process of coal crushing using hydroelectric pulse shock wave, and to guide the engineering application of the new technology of hydroelectric pulse shock wave coal crushing, this paper builds the hydraulic electric pulse shock wave crushing coal based on the principle of the shock wave generated by the high-voltage pulse discharge in the liquid. The relationship between the parameters of discharge circuit and the efficiency of EHD is established, using the mathematical models of plasma channel resistance, shockwave pressure and the newly surface energy of coals, combining the energy balance characteristic during the process of EHD. The complicated analysis of electrical, plasma, fluid mechanics and fracture mechanics are avoided and different capacitor charging voltages are obtained, namely the energy parameters and their conversion in the process of hydroelectric pulse shock wave coal crushing efficient under different capacitor initial energy storage conditions. The results of analysis and experiment show that as the capacitor charging voltage increases, the capacitor energy storage increases, the greater the degree of coal crushing, the better the crushing effect, that is, the proportion of small particle size crushed products increases; under certain application conditions, the energy efficiency of hydroelectric pulse shock wave coal crushing has a maximum value, and the maximum energy efficiency of hydroelectric shock wave coal crushing under the experimental conditions in this paper is 0.64%. Considering the energy conversion efficiency and economic benefits of the hydroelectric pulse shock wave coal crushing process, the low energy consumption and high efficiency hydroelectric pulse shock wave coal crushing technology is the direction of future development.