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AssigneesAmerican Air Liquide, Inc., Air Liquide America Corporation, Jansen Combustion and Boiler Technologies, Inc.
InventorsLouis C. Philippe, Eric L. Duchateau, David R. Scheeff, Arie Verloop, Edward C. Dye
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Methods of increasing the throughput of recovery boilers equipped with at least three levels of injection of air with oxygen enrichment of the air in at least one air level. In one method, a black liquor recovery boiler has three levels of air injection, and oxygen enrichment is applied to at least the secondary and the tertiary air injection levels. In another method, a black liquor recovery boiler has four levels of air injection, and oxygen enrichment is applied to one or more of the tertiary or quaternary air injection levels. In another method, a black liquor boiler has three levels of air injection, with oxygen enrichment applied to at least two air injection levels. After combustion, the oxygen concentration in the resultant flue gas is sensed. The oxygen injection is then adjusted in order to maintain the sensed oxygen concentration at the previously selected oxygen set point.
A method of controlling the oxygen concentration in the flue gas of a recovery boiler, the method being applicable to boilers with three levels of air injection, the method including the steps of:
A method of controlling the oxygen concentration in the flue gas of a recovery boiler, the method being applicable to boilers with four levels of air injection, the method comprising the steps of:
A method of controlling the temperature profile in a recovery boiler, the method including the steps of:
Dependencies are inferred from the claim text.