| 摘要 |
Method and apparatus for feeding an oxidant such as air and/or a fuel rich gas within the confines of a substantially air tight enclosure employed in the heat treatment of volatile containing materials which are deposited on the floor of a rotary hearth mounted within the enclosure. A larger number of air and/or fuel rich gas inlet ports are provided in the roof of the enclosure at the outer periphery thereof than at the central or intermediate areas of the enclosure to thus provide a more oxidizing atmosphere at the outer peripheral area of the enclosure than at the central and intermediate areas of the enclosure. The oxidant is admitted into the furnace enclosure through concentrically arranged rows of inlet openings formed in the roof of the enclosure. The oxidant mixes in the upper portion of the enclosure with the volatiles evolved from the materials and combusts therewith and following combustion of the said oxidant and released volatiles the waste gases of combustion are caused to travel radially outwardly to a peripherally mounted exhaust manifold whereas the materials undergoing heat treatment on the hearth are gradually advanced from the point of entry thereof to a centrally located discharge outlet. Means are provided in the exhaust manifold to cause said oxidant and waste gases of combustion to travel in a line of direction outwardly of the enclosure and into the said exhaust manifold. Thus, the direction of flow of the oxidant and waste gases of combustion within the enclosure is counter-current to the direction of travel of the materials undergoing treatment on the hearth.
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