APPARATUS AND PROCESS FOR THE HEAT TREATMENT OF LIGNOCELLULOSIC MATERIAL

摘要

The invention concerns an apparatus for the heat treatment of lignocellulosic material, and comprises a chamberfor the treatment of the material, at least one combustion chamber (30) with at least one burner (31) functioning in a reducing atmosphere, stirring mechanisms (26, 26') to ensure the circulation of gases in the treatment chamber so that a part of the gases originating from the chamber circulate across the combustion chamber (30). The invention further relates to a corresponding treatment process comprising the following steps: preheating and drying of the material at a temperature akin to that of saturated liquid; heating of the material in a reducing atmosphere; cooling of the material by the injection of water vapor. The first two steps can be automatically controlled by regulating the burner or burners so that the difference between the temperature outside and that within the material remains substantially constant.