drum for a plant for aerobic fermentation of waste

摘要

A rotary drum for aerobic fermentation of waste, comprising ventilation ports with shutters to provide axial circulation of air, is new : A rotary drum for aerobic fermentation of waste, comprising ventilation ports with shutters to provide axial circulation of air. The fermentation drum, measuring up to 40 - 50 m long by 3 - 5 m in diameter and driven so that it rotates about a horizontal or slightly inclined axis (4), has a main cylindrical wall and an outlet with a door (13) in its transverse end wall (6), which also has one or more separate ventilation ports (20, 20a, 20b) with covers (23). The covers are in the form of shutters (28a, 28b) that are held in the closed position by springs (29) on rods (24) and are opened by a force applied against the effort of the springs. The ventilation ports and shutters make up a series of regularly-spaced assemblies (21a, 21b, 21c, 21d) in the drum end wall, and the shutters are opened in sequence by a curved bar (31) outside the drum as they reach the top point in its rotation.