... grains burning in the Furnace, and small grains are turned back to the High Temparature Cyclone and re-seperatered there, after that ... , they pass through the Water CoolTube and then, are turned back to the Furnace, through this process the efficecy is highly enhanced ... the Furnace, which can reduce wear. It can be adjusted to many kinds of coal, and it can desulfurate inside the ...