Dryer's sealing form

Dryer's sealing form contains labyrinth sealing and end sealing, of which labyrinth sealing is used more.

Sealing device is indispensable part on the dryer. If excessive air is leaked into the inlet end, the heat temperature could be reduced and thermal efficiency be effected too. If a amount of cold air is leaked into the outlet end, it is possible to cool the exhaust gas to the dew point and condensation, affecting the normal operation of dust removal installation.

Meanwhile, down draught phenomena often occure duringt the operation. A amount of dust pollution will spill out to pullote the workshop environment without sealing device, thus dryer's sealing is extrmenly important. Dryer usually adopts labyrinth sealing, consist of axial sealing and radial labyrinth sealing. Its stationary ring is fixed to the furnace wall and unloading cast, active ring is welded to the cylinder in order to avoid each ring's confict in the operation. Between the sealing ring, a large gap need to exist, thus the sealing effect is bad.

The stationary ring's lyradial labyrinth seal structure can move axially, whose fixed seat is fixed on the smoke chamber walls or dump bucket, shifting ring is fixed on drum flange. The stationary ring set is inside the fixed seat, the middle of which is filled with asbestos rope. Owing to the stationary ring could axially move, whose sealing ring's gap can be greatly reduced,hus the sealing effect is better. The active ring's lyradial labyrinth seal structure can move axially, whose stationary ring is fixed on the cylinder, which can accommodate the swing of the cylinder.

Because the sealing ring is the welding parts without processing,which is a comprehensive good structure, whose sealing effect is bad, the production is simple, meanwhile saving material. End sealing is the axial end seal structure with a sleeve asbestos rope. Stationary ring is fixed on the furnace wal. The gap between the sleeve and the stationary ring is filled with asbestos rope, and pressed with a clamping ring. The end of asbestos rope is fixed, the other end is tensioned by heavy hammer passing the activity sleeve. Due to the effect of heavy hammer,the end - face seal rings on the movable sleeve and rotary sealing ring on the cylinder are tightened, play a role of the axial face sealing.

This structure can adapt to the cylinder axial and radial wobble having good sealing effect, used widely on the rotary kiln.The end face seal ring having complex structure wears out fastly, but the seal ring wear faster，asbestos rope is easy to lose efficacy due to the friction, thus it is used less in the dryer. Therefore the two most common sealing methods, under the comparison, using labyrinth seal structure in the dryer is better,making convenient and saving materials.