煤中汞燃烧过程析出规律试验研究

Study of mercury emission during coal combustion

在小型煤粉燃烧实验台架上进行煤燃烧后汞的燃烧形态转化试验研究 .采样过程中利用了美国EPA推荐使用的On tario Hydro方法进行煤样燃烧产物的取样 .研究认为 ,煤样燃烧后烟气中的气态汞总量在 10— 15 μg m3 范围内 ,其中二价汞在4 0 %左右 .较低的烟气冷却速率可以促进单质汞向二价汞的转化 .烟气中的气态汞占总汞的 70

The mechanism of mercury emission during coal combustion were studed.In a bench\|scale pulverized coal furnace. Elemental mercury (Hg\+0), divalent mercury (Hg\+\{2+\}) and particulate mercury in flue gas were captured by Ontario Hydro Method, which is recommended by EPA in USA. The experimental results indicated that the gaseous concentrations in the flue gases were found to be 10—15?μg/m 3, the content of Hg 2+ is about 40%. With a slower cooling rate, mercury conversion ratio was higher. The content of mercury in coal ash was very low,about 20%,which showed that the majority of mercury transferred into flue gas with gaseous state.