高温烟气静电除尘中试试验研究

为了研究在宽间距静电除尘器内部流动的大流量高温烟气中颗粒物的静电捕集特性，基于CFB锅炉中试试验平台设计并搭建了高温静电除尘中试装置.试验了板间距300mm、最高温度达到1020K的实际烟气中颗粒物的静电捕集特性，获得了放电电压、温度和烟气流速等关键因素对颗粒物的静电捕集的影响规律.实验结果表明，高温静电除尘器中烟气流速为0.3m/s，温度为1020K下达到了82.2%的除尘效率，证实了针对实际高温烟气，静电除尘器有较好的颗粒捕集效果.通过对比563K到1020K下的热态试验以及常温下的冷态试验，发现颗粒捕集效率随温度的上升迅速降低，这与高温下流速的上升、放电电压的降低以及气体黏性的增加有关.

Pilot-scale experimental investigation on particle electrostatic removal in high-temperature flue gas

In order to study characteristics of particle collection in a large-flow and high-temperature flue gas with a wide-space electrostatic precipitator (ESP), a pilot-scale high-temperature ESP was designed and built based on the CFB boiler pilot test platform. The characteristics of particle collection were tested in the high-temperature ESP with 300mm plate-plate distance at the maximum temperature of 1020K and the influence of key factors such as discharge voltage, temperature and gas velocity on the particle collection was obtained. The experimental results show that the collection efficiency was 82.2% when the gas velocity was 0.3m/s and the temperature was 1020K, which confirmed efficient particle removal for the actual high-temperature flue gas. Through the comparison of the hot test (from 563K to 1020K) and the cold test (ambiance), the particle collection efficiency decreased rapidly with the increasing temperature, which was related to the gas velocity increasing, discharge voltage decreasing and gas viscosity increasing at high temperature.