Pyrolysis of waste to a carbonised char, in stages, with reducing pressure and

摘要

In the waste disposal unit, the materials are exposed to reducing pressure and increasing temperatures in stages, in at least two processing chambers which may be isolated from each other. Volatiles are drawn from each chamber separately and at least partially condensed. Solids are extracted from the last chamber. Non-condensible volatiles are burned at a temperature of at least 800 deg C, pref. 1000 deg C, in a zone of the flue. The solids extracted from the last chamber may be recycled.