H2KV-20-C flender getriebe standorte Helical gear reducers H2

Flender/Flender Gear Units/Helical gear reducers H2

at 2% moisture. At these moisture contents, corncan be stored for up to 9 months and 1 month, respectively, at storage temperature of 4C (. The two major types of heated air grain dryers are bin dryers and portable dryers. Bin dryers are available in batch, recirculating, and continuous categories, whereas porta-ble dryers are commonly available in nonrecirculating and recirculating types. 3.1 Bin Dryers Bin dryers are usually operated at lower airow rates than other types and are generally more energy-efcient, although slower than most other types of dryer. The rule of thumbin the selection of bin dryer size and capacity is that the grain harvested in day shouldbe dried to safe storage level within 2 to permit loading of the next days harvest. 3.1.1 Batch Dryers Batch-in-bin systems are the least expensive for drying grain. The main components are bin with perforated oor, grain spreader, fan and heater unit, sweep auger,and an underoor unloading auger (Fig. . The heater fan starts when the rst load ofgrain is put in and continues to operate as long as is required to lower the average grainmoisture content to the desired level. The drying rate depends on grain depth, temperatureof the heated air, and airow rate. As general rule, an airow of 4 3h/H1m/H1of grain (9 cfm/bu) leads to efcient drying. This is the airow on the exhaust side of the grain bed and is function of the initial ow rate, the grain bed depth, and the grains packingcharacteristics. The pressure drop across the grain bed is usually measured with manome-ter and used to determine the required fan capacity from charts usually supplied by thefan manufacturer. Fig. 1 Typical batch bin dryer. Commercial Grain Dryers 1 For given grain depth, the drying rate can be increased by raising the air tempera- ture, but this increases the chance of overdrying near the oor. An adequate air temperaturefor the crop being dried can be determined from the initial moisture content (see Table .The grain m