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:
Mar. 29, 2005
Filed:
Oct. 20, 1999
Hiroshi Inoue, Hitachinaka, JP;
Tomomi Koganezawa, Hitachi, JP;
Nariyoshi Kobayashi, Hitachinaka, JP;
Masaya Ohtsuka, Mito, JP;
Kazuyuki Ito, Hitachinaka, JP;
Isao Takehara, Hitachi, JP;
Hiroshi Inoue, Hitachinaka, JP;
Tomomi Koganezawa, Hitachi, JP;
Nariyoshi Kobayashi, Hitachinaka, JP;
Masaya Ohtsuka, Mito, JP;
Kazuyuki Ito, Hitachinaka, JP;
Isao Takehara, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The purpose is to improve the mixture ratio of a pre-mixer by a simple arrangement to form a more uniform premixed gases so as to materialize low NOx combustion. Two fuel nozzles disposed circumferentially of a pre-mixer are combined with a single air intake window to make a set, which set is used to produce swirls in a pair, thereby expediting mixing. Further, the inlet window is shaped such that its circumferential width is changed axially of the combustor, thereby changing the strength and size of the swirls to achieve the greatest effect. By reducing both the pre-mixer inlet windows and the partition walls in number, the manufacturing cost can be reduced, and by strengthening and optimizing the swirls, a combustor with superior low NOx performance can be provided, while it is possible to reduce the length of the pre-mixer necessary to obtain the same mixture ratio, leading to a cost reduction.