| 摘要 |
<p>A tobacco dryer is disclosed which comprises a rotating substantially cylindrical drum in which the tobacco is dried. The drum has a first end and a second end and the tobacco which is to be dried enters the first end of the drum and leaves at the second end of the drum. Process air which has a low absolute humidity is introduced into the drum at the second end and flows through the drum in the opposite direction to the flow of tobacco, so as to pick up and remove from the drum, moisture released from the tobacco. A gas fired burner located within the dryer housing produces heating air. This heating air is forced over the exterior surfaces of the rotating drum at a velocity between 500 feet per minute and 3,500 feet per minute so as to increase the heat conductance through the rotating drum. In addition, the dryer is also provided with a controlled water spray which is introduced into the second end of the rotating drum and thereby controls the moisture content of the tobacco leaving the dryer.</p> |
