Oxy-combustion coupled firing and recirculation system

Patent metadata

Field	Value
Publication number	US-9696030-B2
Application number	US-201313751591-A
Country	US
Kind code	B2
Filing date	Jan 28, 2013
Priority date	Jan 28, 2013
Publication date	Jul 4, 2017
Grant date	Jul 4, 2017

Abstract

A combustion system is provided for an oxy-combustion furnace. The combustion system includes at least one windbox mountable on the oxy-combustion furnace and having at least one main firing location. At least one primary inlet is positioned in the at least one main firing location for conveying fuel and the first oxidant into the oxy-combustion furnace. At least one secondary inlet is positioned in the at least one main firing location for conveying the second oxidant into the oxy-combustion furnace. The at least one secondary inlet is angularly offset from the at least one primary inlet.

First claim

What is claimed is:

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.

2. An oxy-combustion system comprising:
a tangentially-fired oxy-combustion furnace including a plurality of walls and corners the walls being disposed between the corners;
a fuel source for conveying a fuel to the oxy-combustion furnace,
at least one oxidant source to provide at least one oxygen stream; and
a combustion system for the oxy-combustion furnace, the combustion system comprising:
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 the at least one oxygen stream 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 the at least one oxygen stream 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, the third oxidant being injected into the oxy-combustion furnace tangentially to a third circle having a third diameter, the third diameter being greater than the second diameter.

3. The combustion system of claim 1 , wherein the at least one secondary inlet is positioned in closely-coupled over-fire air location.

4. The combustion system of claim 1 , further comprising a heat exchanger in fluid communication downstream of the furnace to cool flue is exiting the furnace, and
wherein the second oxidant includes an oxygen stream and flue gas provided upstream of the beat exchanger.

5. The combustion system of claim 4 , further comprising an eductor to provide the oxygen stream and the flue gas provided upstream of the heat exchanger.

Assignees

• Alstom Technology Ltd
• General Electric Technology Gmbh

Inventors

• Kenney James R
• Levasseur Armand A
• Chapman Paul J
• Chen Yen-Ming

Classifications

• F23C5/08 Primary

  Disposition of burners · CPC title

• F23C9/003

  for pulverulent fuel (for fluidized bed F23C10/02) · CPC title

• Y02E20/344

  Cross-Sectional Technologies · mapped topic

• Y02E20/322

  Cross-Sectional Technologies · mapped topic

• F23L9/02

  by discharging the air above the fire · CPC title