GB881111A - Process and apparatus for artificial drying of grass and other fragmentary vegetablematerial - Google Patents

Abstract

881,111. Drying grass &c. NATIONAL INDUSTRI A/S. July 7, 1959 [July 7, 1958], No. 23256/59. Class 34(2) Grass &c., supported on a perforate floor in a chamber is dried in three stages by the circulation therethrough of a current of warm air. During tne first stage, which lasts for about 2 hours, the temperature of the air is allowed to rise to a value of from 35 to 45‹C.; during the second stage, which lasts for from 8 to 10 hours, the heat supply to the air is approximately equal to that required to effect evaporation of moisture in the grass and during the third stage, which lasts for about 12 hours, with approximately the same heat input, the temperature rises to a value of from 55 to 65‹C. The process is carried out in a chamber having a perforate floor 4, Fig. 1, for the grass etc., an air inlet 6, circulation fan 2, electric heater 3, and moist air outlet 5. The inlet 6 and outlet 5 are adjustable, e.g. with dampers, for purposes of temperature control. The space above the floor 4 may be subdivided by a second perforate floor into an upper initial drying space and a lower final drying space, the grass being removed from the upper to the lower space when necessary. In a modification, the initial and final drying stages are carried out in similar chambers disposed, e.g., side by side, the moist air from the final chamber being discharged to the initial chamber to effect predrying; in this modification, each chamber may have its own heat supply.