product description: Rotary drum dryer is mainly used for pre-firing of hard ferrite powder, and can also be used in cement, metallurgy, chemical and other industries. The equipment consists of the main kiln and its supporting transmission device, cooling pipe, fuel system, electrical control, secondary air inlet device, exhaust dust removal device and preheating kiln body. With over temperature alarm, overload alarm, automatic control of working temperature, adjustable oxygen in the kiln. working principle: After the wet material is put into one end of the dryer, the material is evenly distributed and dispersed in the dryer under the flipping of the inner tube, and the material is fully contacted with the cocurrent (countercurrent) hot air to accelerate the drying and heat transfer. Mass transfer driving force. During the drying process, the material can be adjusted to the other side of the dryer to discharge the finished product under the action of the inclined plate and the hot air flow. The heating methods are direct heating and indirect heating. Drum dryers and rotary drum dryers are generally similar, but have more dryer models and series. The main series in the production of different drying equipment companies in China will also be different. Here we mainly explain the HZG tumble dryer. The drum dryer and the rotary drum dryer have large processing capacity, simple operation, good drying effect, and the dried material is in direct contact with the hot air, and is dried by convection heat transfer. According to the flow direction between hot air and material, it is divided into parallel flow and counter flow. In the cocurrent flow, the hot air moves in the same direction as the material, and the hot air at the inlet is in contact with the higher moisture content. Since the material is in the surface vaporization stage, the product temperature still substantially maintains the wet bulb temperature. Although the temperature of the material on the outlet side of the drum dryer and the rotary drum dryer is increasing, the hot air temperature at this time has been lowered, so the temperature rise of the product is not too large. Therefore, the choice of a higher hot air inlet temperature will not affect the quality of the product. This drying of heat sensitive materials includes those which contain materials which are volatile, such as the drying of ammonium salts in the fertilizer industry. However, for the drying of the ammonium salt, the temperature of the material should be lower than 90 ° C to avoid burning. In addition, for materials with high adhesion, it is also very advantageous to use cocurrent drying. In the counterflow mode, the direction of hot air flow is opposite to the direction of material movement. For high temperature resistant materials, countercurrent drying is used, and the heat utilization rate is high. The air outlet temperature of the dryer should generally be about 10-20 °C above the material outlet temperature in the cocurrent mode. In the counterflow type, the air outlet temperature is not clearly defined, but it is reasonable to use 100 °C as the outlet temperature. The diameter of the cylinder of the conventional direct heating rotary drum dryer is generally 0.4 to 3 m, and the ratio of the length of the cylinder to the diameter of the cylinder is generally 4 to 10. The peripheral speed of the dryer is 0.4 to 0.6 m / s, and the air velocity is in the range of 1.5 to 2.5 m / s. Scope of application: It is suitable for the drying of large particles and major materials in chemical, mining and metallurgical industries. Such as: ore, blast furnace slag, coal, metal powder, phosphate fertilizer, ammonium sulfate. Drying of powdery, granular materials with special requirements. Such as: foaming agent, distiller's grains, light calcium carbonate, activated clay, magnetic powder, graphite, dregs. Features: Low temperature drying is required, and large quantities of continuously dried materials are required. The drum dryer has a high degree of mechanization and a large production capacity. The fluid passes through the cylinder with low resistance and low functional consumption. Adaptability to material properties is relatively strong. The operation is stable, the operation cost is low, and the uniformity of product drying is good.