脉冲增强及移动电极技术在火电厂除尘改造中的应用

为控制大气污染,中国许多地区提出了超低排放要求。为降低干式静电除尘器出口烟尘浓度,对静电除尘器脉冲供电技术、极配形式、气流组织形式及旋转刷清灰技术进行了研究,指出脉冲增强静电技术与移动电极技术联合使用,可提高静电除尘器除尘效率,且具先进性。以某电厂330 MW机组除尘改造为例,介绍脉冲增强静电技术及移动电极技术的使用情况。实践表明,改造后的静电除尘器粉尘排放质量浓度为16.4 mg/m³,满足现行《火电厂大气污染物排放标准》要求的20 mg/m³,且运行良好,为火电厂粉尘超低排放奠定了基础。

Application of Pulse Enhancement and Rotary Electrode Technologies in Dust Removal Retrofit for Thermal Power Plants

To harness the atmospheric pollution, the ultra-low emission requirements have been proposed in many domestic areas. In this paper, the study on pulse power supply, electrode configuration, gas distribution and rotatable brush dust cleaning technologies are conducted for reducing the outlet dust concentration of Electrostatic Precipitators (ESPs). The study concludes that the combination of pulse enhanced power combining with rotary electrode can improve the dust removal efficiency with superior advantage. Taking the dust removal retrofit project in a 330-MW unit of a power plan for example, the above applications are presented. The practice shows that the ESP dust emission mass concentration reaches as much as 16.4 mg/m³ after the modification, meeting the standard of 20 mg/m³ required by the “Emission standard of air pollutants for thermal power plants”. So far the ESP is still running in good condition, which lays good foundation for the ultra-low emission of the power plant.