Henan Fote Machinery does some analysis for you:
By the hot air flow rate by the heat and mass transfer theory shows that to improve the flow rate of dry air, directly improving the heat transfer coefficient and mass transfer coefficients, drying rate increases, but also the timely replacement of the hot air, conducive to the proliferation of outside process. However, the improvement of the hot air flow rate for a certain length of the rotary dryer, will reduce the residence time of hot air in the drying of the barrel body that may affect the thermal efficiency, resulting in a waste of heat. By increasing the material and the hot air in the cylinder axial unit length of contact time and contact area, through the transformation of the lifting plate materials in the cylinder cross-sectional dispersion of purpose, by increasing the dryer cylinder length.
In general, the higher the temperature of the hot air temperature of hot air, heat transfer rate and mass transfer rates higher, in the case of the same amount of water evaporation, the amount of hot air can be reduced, the exhaust heat loss is reduced. However, control of most of the imports of cement plant dryer hot air temperature is low, even if the downstream dryer temperature of 700 ℃ or so, so the extent permitted by the cylinder, the substantial increase in imports of hot air the temperature is not feasible.
Third. Into the feed size and feed uniformity in the drying rate in certain circumstances, the material and the hot air the greater the contact area, total dry the better. The smaller the particle size, the internal diffusion resistance of the smaller, help to improve the drying rate. Pellet group contrast, is easy to form a gas layer, to prevent the inner material of the heat and mass transfer. Therefore, in the drying of materials, the material and the broken handle. The amount of feed material current premise. Can guarantee the stability of the dryer thermal load and thermal regime on the one hand, material moisture content after drying, so that the load of heating of the hot stove, etc.; the other hand, can also be easy to grasp and control the exhaust.
Henan Fote Heavy Machinery Co., Ltd is a joint-stock mining machinery manufacturing enterprise integrated in scientific research, production and marketing of wood chip dryer, copper concentrate dryer and other commonly used mining equipment, welcome to visit and cooperate with us. Thank you!
hot air dryer: http://www.ft-dryer.com/products/Hot-air-dryer.html