Fixed-bed gasification furnaces and methods for gasifying organic waste

摘要

In a fixed-bed gasification furnace for burning and gasifying organic wastes such as scrap tires and waste plastics for various purposes, such organic waste charged thereinto is gasified with a supply of a gasifying agent comprising a mixture of an oxygen-containing gas and steam. The furnace comprises means for measuring the height of a layer of the charged organic waste in said furnace, means for measuring the internal temperature of said furnace, a nozzle for supplying steam or nitrogen gas to a middle part of the organic waste layer, a controller for controlling the feed rate of the gasifying agent in response to a signal from the means for measuring the height of the organic waste layer, and a controller for controlling the feed rate of steam or nitrogen gas from the nozzle in response to a signal from the means for measuring the internal temperature of the furnace. The furnace may comprise two internal sections: an A-compartment where the raw material is fed and volatiles present therein are predominantly pyrolyzed and gasified, and a B-compartment where the residue consisting largely of fixed carbon which remains after most of the volatiles have been pyrolyzed and gasified is introduced and burned or gasified. <IMAGE>