MULTIPLE PRODUCT BELT DRIER FOR DRYING PASTY AND/OR POWDERY MATERIALS, PARTICULARLY FOR DRYING SLUDGES FROM TREATMENT PLANTS OR BIOMASS

摘要

The present invention relates to a multiple product belt drier comprising a first air permeable conveyor belt (2) on which the materials to be dried are poured to form a first drying path; at least a second air permeable conveyor belt (3) to assure at least a second drying path for drying the materials (M3) after the first one; air blowing means (10); air heating means (14) for heating the blown air to dry the materials, and a drying air distribution circuit for distributing the drying air towards the materials and the belts; the drying air circuit being provided so that the drying air circulates downwards (D) through the materials to be dried and the belts, and air reheating means (15) are provided between the two paths to reheat the air which has passed through the layer of materials on the first belt (2), before it passes through the layer of materials on the second belt (3).