For the purposes of direct dry, warm air enters the rotation of the cylinder end, the other end through it and quit. Ticket is welded to the inner wall of the cylinder lifts and shower wet material, it will be direct contact with the hot air. Flight configuration depends on the characteristics of the material being processed. This configuration be customized in order to deal effectively with the product, as it flows through the dryer. Also according to the customer's clothes dryer capacity and characteristics of the product of the length and diameter of the cylinder.
Typically, full of cylinder volume Rotary dryers 10%-15%. Is usually at least 4 times the length of the diameter of the cylinder to achieve product and effective heat transfer between the air flow and temperature balance.
Hot rotating airflow in the dryer can be directly counter or conveying of material parallel to the dryer. Paralleled machines exposed to wet feed material, with the hottest air temperature. They are very effective in treatment of high water content of sludge cake. Due to the fast heat exchange, has remarkable evaporative cooling products. This cooling effect of drying of a wide range of materials without thermal degradation of materials have different thermal sensitivity.
Countercurrent dryers expose the highest temperature in the drying of materials. This configuration is usually the best processes, requires a specific higher discharge temperature or moisture content of the product is very low.
Indirect heated Rotary type dryer is the most commonly used products of small size, could lead to too much dust. They can also be used for processes that require extreme control dryer exhaust. Indirect heat dryers depends on conduction and radiation heat transfer from the cylinder walls of the wet material. Rotary drum around a stationary furnaces and heating the cylinder wall. Requires little or no air flow through the dryer. Indirect Rotary dryer, it can provide only a limited amount of heat transfer area. They cannot be effectively addressed, tend to adhere to the wall material of the heating cylinder.
