Improvements in apparatus for drying vegetable and like substances
Реферат: 154,998. Zimmerman, O., and Weyel, H. Sept. 5, 1919. Gravity, materials descending by.-In a drying apparatus having a pair of shafts through which vegetable or other material is fed continuously, the drying medium being passed repeatedly through different portions of the material to and from chambers arranged one between and one at each side of the shafts, the drying-medium is passed through the lower parts of the shafts into the outer chambers, reheated or mixed with heated gas and passed back through the upper parts of the shafts to the middle chamber. In the apparatus shown in Fig. 1, material is fed from hoppers T to a pair of shafts S having perforated sides, and is discharged by drums 22 partitioned radially and operated by external hand levers. The air chamber between the shafts is divided into a lower compartment H and an upper compartment A'. Air is forced through a heater into the lower compartment, passes through the material in the shafts into outer chambers K wherein it is heated by steam-pipes R' and passes back through the material into the upper chamber A<1> and to atmosphere. Alternatively, cold air may be supplied to the lower compartment, whereby the dried material is cooled before its discharge. Figs. 4 and 8 shows a plant wherein gases from a furnace 7 after depositing solid matters in a chamber 8 flow in part through a damper-controlled pipe 10, wherein they are mixed with a proportion of air entering by a damper 12, into the lower compartment 4 of a double-shaft drier with perforated walls, and thence through the material into the outer chambers 6 of the drier, where they are mixed with and heated by furnace gases entering by a dampered pipe 11 having a damper 13 for regulated admission of fresh air, and pass back through the material into the upper compartment. Adjustable baffle-plates 18, 19 in the chambers 6 regulate the admission and mixture of gases. In a modification, the gases from the pipe 11 pass into perforated pipes within mixing boxes in the chambers 6. In a further modification, the drying shafts are provided with rotatable flaps about half-way down. so that only their upper halves may be filled with material at starting.
IMPROVEMENTS IN PROCEDURE AND APPARATUS FOR DRYING PARTICULATE TOBACCO
Номер патента: MX163894B. Автор: Roger William Hedge. Владелец: Empresas La Moderna S A De C V. Дата публикации: 1992-06-30.