多煤种、变工况条件下颗粒物超低排放技术分析

Ultra-low Emission of Particles in Flue Gas under Multi-coal Firing and Variable Working Conditions

通过对燃煤火电机组燃用煤种多变性、变工况现象及稳定实现超低排放的政策要求和《电力发展"十三五"规划》的研究,对我国多煤种、变工况运行对实现颗粒物超低排放的影响进行了分析,并对除尘技术对多煤种、变工况的适应性进行分析。研究显示,在多煤种、变工况的新常态下,低低温电除尘技术更好地提升了电除尘技术的适应性,而湿式电除尘能够适应新常态下的工况变化,起到终端把关作用,湿法烟气脱硫+湿式电除尘器对于硫酸气溶胶和细颗粒物有很高的脱除效率,满足颗粒物超低排放及控制PM_(2.5)、硫酸雾和脱汞的要求。同时,对相关技术的发展进行了展望。

According to policy requirements on stable ultra-low emission in flue gas under variable working conditions and multi-coal firing together with the 13th five-year plan for electric power development, the influence of ultra-low emission in flue gas by variable working conditions and coal types and the adaptability of dust collector were analyzed. The conclusion was that low-low temperature ＇electrostatic precipitator promotes robustness of dust removal performance, and wet electrostatic precipitators can guard terminal flue gas emission under variable working conditions and multi-coal firing. Wet flue gas desulfurization following with wet electrostatic precipitator has high removal efficiency on sulfuric acid aerosol and fine particles, which can achieve ultra-low emission of particles and satisfy the requirements of PM2.5 control, sulfuric acid aerosol and mercury removal. Meanwhile, the development of related technologies was prospected.