Abstract: Abstract:The control features of air damper of doubleended coal mill were introduced. Under cold stat, the test of the damper opening and air flow test for the multipleblade air damper and the single blade air damper were carried out. The air flow features of the two air dampers and their influences on hot state operation were compared. Some targeted suggestions were given.

Key words: Keywords:doubleended coal mill, capacity air damper, control feature, comparison of air flow