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:
Nov. 01, 1983
Filed:
Mar. 04, 1981
Akira Izuha, Koganei, JP;
Tomoyuki Shinano, Yokohama, JP;
Yuho Shibayama, Chiba, JP;
Chikatoshi Kurata, Akashi, JP;
Kenichi Fujii, Kobe, JP;
Kawasaki Jukogyo Kabushiki Kaisha, Kobe, JP;
Abstract
A pulverized coal burner including a primary throat having at its forward end a swirler for feeding pulverized coal and primary air in vortical flow, a secondary throat located outside the primary throat for supplying secondary air and a burner throat located outside the secondary throat for supplying tertiary air, the secondary and burner throats being located concentrically with the primary throat having at its forward end a flame sustaining plate diverging outwardly to cause the secondary and tertiary air to flow away from the primary throat along the inner surface of the outwardly diverging forward end portion of the burner throat, to thereby avoid mixing of the secondary and tertiary air with the pulverized coal air in a primary flame region in which the pulverized coal burns slowly and produces NOx in reduced amount. The secondary throat can be moved to adjust the spacing between its forward end and the flame sustaining plate, to adjust the amount of the secondary air and the flow of the secondary and tertiary air. Unburned components of pulverized coal from the primary flame region can be mixed with the secondary and tertiary air in a secondary flame region downstream of the primary flame region and burned at a slow speed at low temperature to reduce the amounts of NOx produced.