H2-KV-26-D flender bearing Helical gear units H2

Flender/Flender Gear Units/Helical gear units H2

ated air are introduced at one end of the shell and dried grain and moist air exit at the other end. The grain is moved through the entire length of the shell by cascading certain distance along the periphery of theinclined shell, such that in each fall, the grain is moved closer to the exit. typical commercial rotary dryer has shell diameter of 1 , length of 1 3 , and slope 2 from the horizontal. The shell rotates at 4 rpm, and the drying air temperature is 1 (. Rotary dryers are increasing in popularity for the parboiling of rice because they are particularly suited to drying high moisture particles that tend to stick together and cannot be suitably dried in bin or column dryers. Thespecic energy consumption of the system cannot be fairly compared with that of otherdryers, for the parboiled rice is at much higher moisture content than those materialsdried in other types of units. 3.3 Portable Dryers Portable dryers generally appeal to the farmer who has grain bins in various locations, or who does custom drying off the farm. Portable dryers may be used without proper grain-handling system to ll an immediate need in an emergency situation; however, they arenormally not used when drying is benecial, but not necessary, owing to the inconvenience Commercial Grain Dryers 1 of setup and dismantling of the system. The two types of portable batch dryers are nonrecir- culating and recirculating. 3.3.1 Nonrecirculating DryersMost nonrecirculating dryers have fully enclosed concentric cylinder conguration. They are loaded from the top, and drying is accomplished by blowing hot air radially through column of grain. Although the inside grain layer (the layer near the hot air plenum)tends to overdry while the outside layer remains underdried as occurs in the batch-in-bindryer, the damp and dry grain are mixed as the grain is removed from the dryer so thata satisfactory product results. Other types of portable nonrecirculating batch dryers exist, such as wagon or tru