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US 4,500,286 AGranted
Primary air supply unit of rotary kiln
AssigneesNippon Furnace Kogyo Kabushiki Kaisha, Chichibu Cement Co., Ltd.
InventorHiroshi Nagai
Life of this patent
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Abstract
In a primary air supply unit of a rotary kiln, an improved method for reducing a primary air rate by providing a high-pressure blower for primary air to inject the primary air from a burner together with fuel. In addition, in order to preheat the primary air and to protect any fragile portions in a clinker box for cooling sintered material from the rotary kiln and for preheating the primary air.
Claims6
In combination, a rotary kiln,
- a burner disposed at one end of said kiln,
- means for supplying primary air under pressure to said burner,
- a clinker box adjacent said end of said kiln for receiving clinker produced by said kiln,
- said clinker box having a ceiling thereover,
- means for passing secondary air into contact with said clinker prior to passing said secondary air into said end of said kiln,
- at least one heating tube group disposed adjacent to said ceiling,
- said heating tube group formed with a continuous passage having one end in communication with said burner and the other end in communication with said means for supplying said primary air to said burner whereby said primary air passes through said heating tube group in said clinker box and is preheated prior to passing into said burner.
4 more elements
Dependencies are inferred from the claim text.