关键词: 粉尘排放, 静电除尘器, 收尘效率, 紊流掺混系数, 强制收集

Abstract: Discusses theoretically and experimentally how to improve the efficiency of dust collection by use of ESP of which the efficiency is actually low until now. It was proved that there is a mass concentration gradient in dust distribution within the electric field by way of a mathematic analysis of the dust transfer model and the sectional measurement of dust mass concentration, i.e., the closer the dust to the plate electrode, the higher the mass concentration. The dust emission rate can be significantly decreased at ESP outlet when the gas flow containing high-concentration dust is sucked out through a suction opening at the end of ESP's plate electrode and the dust thus collected is then gathered into high-efficiency bags or treated secondarily at ESP inlet as the gas flow is cycled there. In addition, such a forced suction can reduce effectively the secondary dust flying due to beating/shaking the dust collecting plate. Analyzing the flow function at suction opening where the flowrate is constant, the relationship between suction height and efficiency of dust collection is revealed.