火电厂载汞煤灰的汞脱附现象研究

A Study on Mercury Desorption of Mercury in Coal Ash of Fossil-fuel Power Plant

测量了3个电厂8种煤灰样品在自然环境和人工环境下重金属汞的气相释放特性。结果显示,重金属汞的气相释放与不同能级活性点分布和载汞体(煤灰)孔隙分布有关,可以按对数曲线归纳汞的脱附规律。实验还发现,影响金属汞脱附的因素还有飞灰含汞量和环境温度,前者的影响是随着飞灰含汞量增加,重金属汞的脱附按指数规律增加;后者的影响显示在不同季节汞的脱附速度不同。

Gas-phase releasing characteristics of heavy metal mercury of eight kinds of coal ash sample from three power plants are measured under natural environment and artificial environment. The result shows heavy metal mercury of gas releasing is related to the distribution of dif- ferent energy-level active site and of coal ash porosity. Induction of mercury desorption .rule can be made by logarithm curve. Experiments also show that mercury content in fly ash and environment temperature are also factors effecting metal mercury desorption. The effect of the former is along with the increases of mercury content in fly ash, desorption of heavy metal mercury increases by index regularity. And the effect of the latter shows mercury desorption speed varies by different season.