| 摘要 |
<p>A process for low-emission drying of wood chips comprises a first drier (2), heated directly by a combustion chamber (3). Connected in series to this drier (2) is a second, indirectly heated drier (5), the exhaust air from which is recycled to the combustion chamber (3) through a duct (7). The exhaust gases emitted by the drier (2) enter a second combustion chamber (11), where they are heated to at least 300°C to eliminate the noxious substances. The heat used for this purpose can be recovered by means of a waste heat boiler (14) and used to heat the second drier (5).</p> |
