低低温电除尘关键技术研究与应用

低低温电除尘技术是电除尘新技术,其自身耗能少,并可去除烟气中大部分的SO₃,在日本已经成为燃煤电厂烟气治理的主流,而国内对低低温电除尘器其各方面的性能和影响因素研究较少。针对低低温电除尘技术的煤种适应性、酸露点、灰硫比及其计算公式、二次扬尘、离线振打以及相互之间的影响进行了分析,研究了典型的低低温电除尘系统、灰硫比对电除尘器腐蚀和除尘效率的影响幅度、旋转电极与低低温电除尘的结合系统,列举了中国即将投运的具有代表性的低低温电除尘器。

Research and Application on Low-Low Temperature Electrostatic Precipitator Technology

As a new dust removal technology, the low-low temperature electrostatic precipitator (LLT-ESP) has the advantages of low energy consumption and high SO₃ removal efficiency and has become the mainstream method in flue gas treatment in Japan. However, studies on the LLT-ESP performance are few in China. In this paper, the analysis on the coal adaptability, acid dew point, D/S ratio (the concentration ratio of PM to SO₃ solution as H₂SO₄), dust re-entrainment and off-line rapping technique is conducted and the D/S ratio formula is proposed. The influencing amplitude of D/S ratio on the corrosion and dust removal efficiency of typical LLT-ESP and the application of combining mobile electrode with LLT-ESP are studied. At the end, some of the most representative LLT-ESPs which will be launched in China are introduced.