Optimization of Corona Electrode Structure for the Needle-Roller High-Voltage Electrostatic Separator

In order to improve the separation efficiency of needle-roller high-voltage electrostatic separator, it is necessary to optimize the structure of corona electrode. In this paper, some experiments were conducted for needle-roller discharge with a self-made needle-roller high-voltage electrostatic separator in a fixed distance d=50 mm of needle rollers. The distribution of electrostatic separation electric field was analyzed in the experiments by adjusting the voltage, discharge needles spacing and the needle arrangement for the optimization of corona electrode structure. The results show that with the needle spacing decreases, its discharge effect weakens after the first growth and the best value occurs when the needle spacing is 12 mm; in the best-needle spacing, adjusting the needle arrangement for 30 mm-15 mm-30 mm, a better discharge results can get. The amount of charge on the surface of the roller can be increased by 33% when the input voltage was 15 kV. The discharge effects of different needle spacing were simulated with Matlab software. The results provide a basis for the optimal design of the electrostatic separator.