Patent ID: 9696030
Date: 2017-07-04
CPC Classifications: F23C,F23L,Y02E

Claim:
1. A combustion system for an oxy-combustion furnace, the combustion system comprising: a furnace having a plurality of walls and corners, the walls being disposed between the corners; a plurality of windboxes one each mountable on the oxy-combustion furnace at the corners thereof, each of the windboxes defining a main firing location; at least one primary inlet positioned in each of the windboxes for conveying fuel and a first oxidant into the oxy-combustion furnace tangentially to a first circle having a first diameter; and at least one secondary inlet positioned in each of the main firing locations for conveying a second oxidant into the oxy-combustion furnace tangentially to a second circle having a second diameter, wherein the second diameter is greater than the first diameter; and at least one intermediate inlet disposed in a mid-wall port located approximately midway between two of the corners of the furnace for injecting a third oxidant into the oxy-combustion furnace tangentially to a third circle having a third diameter, the third diameter being greater than the second diameter.