The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 03, 1993
Filed:
Mar. 01, 1991
Hironobu Kobayashi, Katsuta, JP;
Kiyoshi Narato, Taga, JP;
Shigeru Azuhata, Hitachi, JP;
Hiroshi Miyadera, Hitachi, JP;
Shigeki Morita, Hiroshima, JP;
Tadashi Jimbo, Kure, JP;
Kunio Hodozuka, Kure, JP;
Akira Baba, Kure, JP;
Hitachi, Ltd., Tokyo, JP;
Babcock-Hitachi Kabushiki Kaisha, Tokyo, JP;
Abstract
A burner for pulverized coal has a coal duct for pulverized coal and primary combustion air and a secondary combustion air duct such that the coal and primary air and secondary air mix outside the outlet nozzles of the duct in a mixing zone at which combustion occurs. Coal distribution means in the coal duct create, adjacent the outlet nozzle, at least one outer zone of flow spaced from the coal duct axis and at least one inner zone of flow nearer the coal duct axis. These are means for slowing flow in the outer zone relative to the flow in the inner zone, prior to the mixing zone. To achieve good mixing, and promote NO.sub.x reduction, the coal concentration in the outer zone is higher than in the inner zone. The slowing means may be radially inwardly projecting baffles.