Patent ID: 6742463
Filing Date: 2004-06-01
Classification: D21C,F23G,F23L,Y02P

Abstract:
A furnace of a recovery boiler comprising:a front wall, a rear wall and side walls to the furnace, at least one black liquor spraying device disposed at or above a black liquor spray horizontal level on at least one of said walls, wherein said black liquor spray horizontal level is devoid of air ports; a plurality of primary air ports on at least one of said walls; a first horizontal level of secondary air ports arranged on opposite walls of said furnace and a second horizontal level of secondary air ports on said opposite walls, where said first and second horizontal levels of secondary air ports are vertically lower on said walls than the black liquor horizontal spray level and are vertically above the primary air ports; the secondary air ports in each of said first and second horizontal levels on one of said opposite walls are an even number of ports and odd in number on the other of said opposite walls, and the secondary air ports in each of said first and second horizontal levels on said opposite walls are such that the air ports for each horizontal level project an interlaced pattern of air jets into the furnace from said opposite walls.