循环流化床烟气脱硫装置对电除尘器影响研究

A Study of the Influence of the Flue Gas Desulfurizer of a Circulating Fluidized Bed on an Electrostatic Precipitator

在一台75t/h燃煤锅炉上,设计建造了双循环流化床烟气悬浮脱硫系统,在脱硫系统运行前后,对配套电除尘器入口处烟气的温度、湿度、化学成份、粉尘的粒径、表观形貌和比电阻等相关特性进行了比较分析。结果显示,在脱硫系统运行后,可使除尘器入口处烟气的湿度增加,温度降低尘粒的比电阻下降,从而提高了系统的脱硫效率与电除尘器的除尘效率。还研究了循环流化床烟气脱硫装置对电除尘器工作稳定性和除尘效率的影响,同时提出了应对措施。

The flue gas suspension desulfurization system of a double circulating fluidized bed was designed and constructed for a 75 t/h coal-fired boiler. Prior to and after the operation of the desulfurization system a comparison analysis of the related characteristics at the inlet of an electrostatic precipitator was conducted. Such characteristics include flue gas temperature, humidity, chemical composition, dust particle diameter, outward appearance and specific resistance, etc. It has been found that after the operation of the desulfurization system the humidity of the flue gas at the inlet of the electrostatic precipitator has increased while its temperature and dust particle specific resistivity decreased, thus enhancing the system desulfurization efficiency and the dust removal efficiency of the electrostatic precipitator. Also investigated was the impact of the flue gas desulfurizer of the circulating fluidized bed on the operation stability and dust removal efficiency of the electrostatic precipitator. Meanwhile, several countermeasures for operation improvement are also proposed.