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. 23, 1995
Filed:
Jan. 27, 1994
Oliver G Briggs, Jefferson, MA (US);
Riley Stoker Corporation, Worcester, MA (US);
Abstract
A new and improved method and apparatus for altering the firing pattern of an existing furnace of the type including at least one pair of vertically spaced apart burners mounted on a wall of the furnace and supplied with secondary air from a common windbox. The method involves cutting a rectangular panel from the furnace wall around a first burner wherein the burner is located asymmetrically toward a first panel end and spaced farther away from a vertically opposite second end of the panel. The cut-out panel is then reversed in orientation from end to end so that the first burner is then spaced farther apart at a greater distance from a second burner. The panel is reinstalled in the furnace wall in reverse orientation thereby providing a greater spacing or staging distance between the first and second burners producing a reduced level of NO.sub.x when the burners are fired. The increased spacing distance between the burners, the inclusion of new interstage air ports on the panels, and the addition of new burners with unique secondary air swirl orientation results in greatly improved lower NO.sub.X levels in a retrofit of an existing furnace.