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:
May. 08, 2007
Filed:
Nov. 09, 2004
Hirofumi Okazaki, Hitachinaka, JP;
Kenji Yamamoto, Hitachinaka, JP;
Kenji Kiyama, Kure, JP;
Kouji Kuramashi, Kure, JP;
Hirofumi Okazaki, Hitachinaka, JP;
Kenji Yamamoto, Hitachinaka, JP;
Kenji Kiyama, Kure, JP;
Kouji Kuramashi, Kure, JP;
Babcock-Hitachi K.K., Tokyo, JP;
Abstract
A solid fuel burner and its combustion method suited for encouraging fuel ignition and avoiding slugging caused by combustion ash, wherein a gas of low oxygen concentration (exhaust combustion gas) is used as a carrier gas of such a low grade solid fuel as brown coal. Means for Solving the Subject An additional air nozzlefor jetting additional air having a velocity component in the circumferential direction of a fuel nozzleis provided in the fuel nozzle, thereby encouraging mixing between the fuel and air in the fuel nozzle. Further, the amount of air supplied from the additional air nozzleis adjusted in response to the difference in combustion loads. Under light load, the amount of air supplied from the additional air nozzleis increased so as to increase the oxygen concentration of the circulating flowformed downstream of the outside of the outlet of the fuel nozzle, whereby stable combustion is ensured. Under heavy load, by contrast, the amount of air supplied from the additional air nozzleis decreased, and a flame is formed away from the fuel nozzlein such a way that burner structures and furnace wall will be less subjected to radiant heat.