Types HH HH HH BH and BH Type BH Cou B4-VV-16-D Bevel-helical gear boxes B4

Flender/Flender Gear Units/Bevel-helical gear boxes B4

te humidities of air (kg/kg) at the entrance and exhaust point of the drying front, respectively; mmandmoare average moisture contents of the grain (% db) at the end of maximum rate period and at the initial condition, respectively; mis the drying time () for this maximum drying rate period, and Wdis the weight of bone-dry grain (kg). During the falling rate period, the drying time ( ) can be obtained from Eq. (: /H1 klnmm/H1me mf/H1me( where mfandmeare the nal and equilibrium moisture contents (% db), respectively. All batch-type static-bed dryers are designed on the deep-beddrying principle. An example of deep-bed graindrying system is in-bin drying of grain, which is commonlyused for seed drying and grain storage. Different capacities and sizes of bin dryers are 1 Das and Chakraverty used to obtain various drying rates. Because they use low airow rates, their energy utiliza- tion factor is higher. The size selection of this kind of deep-bed grain-drying system (binsize) is generally based on the quantity of grain available per day that should be driedwithin 2 (. 4.3.5 Fluidized Bed Drying When the uid velocity through bed of solid particles steadily increases, then both the pressure drop in the system and the drag on the individual particles increase. Ultimately, the particles start to move and become suspended in the uid. The condition of fully suspended particles that behaves as dense uid is called uidization, and the bed istermed uidized bed. Dryers in which the solids are uidized by the drying gas are called uidized bed dryers. These kinds of dryers are useful in various drying applications (. Food particles suitable for uidized bed drying should be in the size range of 2 m1 mm. Cereal grains can be easily uidized over wide range of moisture contents. The air velocity should be as high as possible to promote rapid drying. The minimum orincipient uidization velocity ( ) for nonspherical particles and entrainment or terminal velocity ( Ve) for s