Abstract
Low grade coal accounts for the half of total coal resources in the world and super high moisture coal with the moisture content higher than 50% is one kind of it. When such super high moisture coal is applied to conventional USC boilers, the shortage of mill drying capacity and the decline of ignitability and combustibility caused by the decrease of oxygen concentration in burner zones and the increase of moisture content of coal particles are the main concerns. In this research, grinding test and combustion test using super high moisture coal were carried out. And the stable grinding conditions for preventing particles adhesion in mills under high humid atmosphere, and the stable combustion under low oxygen concentration in primary air were verified. These results enabled to utilize low grade and super high moisture coal in conventional USC boilers.
