Selection Tips of Dryer
1.Equipment specification The selection of dryer model is according to the actual situation of local conditions, and two important indicators of the productivity and precipitation. If there are 3000t corns with moisture content of 26%, the average environment temperature is -5℃, corns can be stored for 15 days. If the dryer works 20h every day, safe moisture reduces to 14% after 30 days by drying, we can use the dryer with small processing capacity of 5t/h and greater drying capacity. If the quantity of grain is large during the drying season. We can use the large, high efficiency and fast dryer.
2.Production capacity The dryers’ selection should not be too small. Because we usually use dryer only when it’s rainy days during the harvest season. The dryers with large volume and small productivity cannot work pretty well.
State and local reserve depots, large and medium-sized dryers should be built in the regions with concentrated grain. The service radius of stationary dryers should not be too large, to reduce the transportation distance, costs and increase efficiency. Mobile dryers can be used in rural areas with dispersed grain and areas with small food production. The productivity is generally 2 to 5 t/h. The service radius should be larger to play the role of mobile dryer.
3.Heat sources When selecting a dryer, it is necessary to consider the local energy resources, to achieve reasonable utilization and reduce costs. Coal, anthracite and coke are suitable as energy resources in coal mining areas. The cost is low, but the coal-burning furnace has a large investment.
Light diesel oil, heavy oil, natural gas, and propane can be used as hot-blast stove fuel, in the food production areas with oil fields and natural gas. The cost of the fuels is high, but hot-blast stove has a smaller investment. Hot-blast stove with fuel or natural gas is suitable for seed dryer, because it has stable air temperature, easy control, and can ensure the germination rate of dried seeds.
4.Environment Because of the different harvest seasons of various crops, and the temperature difference between the north and the south, it is necessary to consider the drying effect and the operating cost. For example, it is better to avoid drying grains during low-temperature and...
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