Drying prods, esp. agricultural prods. - by circulating through prod. air dried and heated by contact with water-absorbent soln. conc. by solar energy

摘要

Method of drying prods., partic. agricultural prods. stored in a drier, consists of circulating through the drier air of which the moisture content has been reduced and the temp. has been raised before its charging to the drier. The air is dried and its temp. is raised by contact with a soln. previously conc. by solar energy and rendered water-absorbent. The air thus dried and heated and the diluted soln. are sepd. following the absorption of a determined quantity of water contd. in the atmospheric air. The diluted soln. is charged to the solar concn. appts. for a new concn. The hot, dry air is circulated through the drier in contact with the products being dried. The drying and heating of the air are pref. carried out in a tower by causing the air to circulate to suction from the top of the tower downwards and atomising the absorbent soln. at the upper part of the tower. The process allows cereals to be dried even in overcast weather, the reconcentration of the soln. being carried on sunny days. The water-absorbent soln. can be e.g. a soln. of sulphuric acid, caustic soda or potash, or lithium chloride or bromide.