Mercury emission law of coal combustion in Tianzhuang Coal Preparation Plant

Taking 7 coal samples of lump raw coal,lump clean coal,lump middling coal,coal refuse,raw fine coal,clean fine coal and fine middling coal from Pingdingshan Tianzhuang Coal Preparation Plant as the study objects,the paper discussed the mercury migration and variation law in the coal preparation processing and the mercury emission law under the different combustion temperatures.The results showed that after the physical preparation,some organic mercury compound could be concentrated in the heavy medium.Whatever raw coal,middling coal,clean coal or coal refuse would release its most total mercury under the temperature of 250～650℃,and the air phase straight mercury content would be higher than the oxidized mercury content.