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US 6,702,570 B2Granted
Firing method for a heat consuming device utilizing oxy-fuel combustion
AssigneePraxair Technology, Inc.
InventorsMinish Mahendra Shah, Lawrence E. Bool, III, David Richard Thompson, Christian Friedrich Gottzmann, Hisashi Kobayashi
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Abstract
A method of firing a heat consuming device such as a boiler or furnace in which an oxygen transport membrane is integrated with the device such that part of the permeated oxygen supports an initial combustion to heat the incoming air to the oxygen transport membrane system. A remaining portion of the oxygen after having been diluted with flue gases from the boiler supports a secondary combustion of fuel within the heat consuming device.
Claims18
A method of firing a heat consuming device comprising:
- compressing air to form a compressed air stream;
- heating the compressed air stream to form a heated compressed air stream;
- the compressed air stream being heated at least in part by a first oxy-fuel combustion;
- separating oxygen from the heated compressed air stream by an electrochemical separation process involving oxygen ion transport through a ceramic material to produce an oxygen permeate stream and a retentate stream;
- firing the heat consuming device by a second oxy-fuel combustion producing a carbon dioxide-containing flue gas;
- supporting the first and second oxy-fuel combustion with oxygen contained in the oxygen permeate;
- the oxygen being introduced into the second oxy-fuel combustion as a diluted oxygen stream formed by diluting the oxygen permeate with a diluent formed at least in part by recycling part of the carbon dioxide-containing flue gas;
- and
- extracting a product stream from the heat consuming device also formed from a remaining part of said carbon dioxide-containing flue gas.
6 more elements
Dependencies are inferred from the claim text.