The scope of the drum dryer:
1. Dry the powdery or granular materials with special requirements. Such as various crystals, light calcium carbonate, activated clay, magnetic powder, graphite, inorganic mud, clay, lime slurry, ore mud, phosphate slag, aluminum plant red mud.
2. It requires low temperature drying and requires large quantities of continuously dried materials.
3. Agriculture, feed, fertilizer industry, such as straw, pasture, leaves, fish meal, corn sauce, starch residue, distiller's grains, dregs, pomace, soy sauce residue, bagasse, peat, organic compound fertilizer, sludge, aquatic product waste , food factory waste, slaughterhouse waste, organic fertilizer, inorganic fertilizer, phosphorus fertilizer ammonium sulfate.
4. Chemical, miner, metallurgical and other industries, such as ore, slag, coal, metal powder, clay, diatomaceous earth, kaolin.
The drying capacity of the drum dryer is related to the dryness and wetness of the material and also to the choice of heat source. High-humidity materials, if the drying is not sufficient, the dried materials will be slightly moist, and the choice of heat source is also critical.
Selection of heat source: As a kind of heat source equipment for drying equipment, it is usually classified according to the fuel consumed. There are coal, fuel, gas, electricity, etc. According to the heat transfer condition, it can be divided into direct heating and indirect heating of drying medium. For example, the boiler heats water to form water vapor, and the water vapor heats the drying medium through the radiator. This is two indirect heating. The total thermal efficiency of this method is very low, only about 40%. In some factories, there are many hot spots. In order to facilitate centralized heating and management, more is used. The coal-fired hot blast stove has indirect heating and direct combustion flue gas as the drying medium (direct fire furnace), and the indirect heated hot air is clean and the thermal efficiency is 60-70%. In the case of direct heating, the quality of the product is affected by the pollution of the smoke, but the utilization of the heat energy is sufficient, the heat efficiency is high, and when a small amount of smoke is mixed in the material during drying, there is no influence, and it can be preferably used. Oil burners are also used more and more now, and have the advantages of simple operation, rapid temperature rise, stable temperature, convenient control, and low cost of use.
The reasonable choice of heat source has a great impact on the investment cost of the drum dryer, hot air temperature, drying quality of materials, drying cost, environmental protection, labor intensity, and automatic control level. Therefore, it is necessary to carry out objective analysis according to the actual situation, and then purchase the heat source equipment required for the drum dryer.
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