EDWARD C DYE
Engineers in Bothell, WA

6799526, Oct 5, 2004

Dec 6, 2001

10/016067

Louis C. Philippe - Versailles, FR
Eric L. Duchateau - Gieres, FR
David R. Scheeff - Marietta GA
Arie Verloop - Kirkland WA
Edward C. Dye - Bothell WA

American Air Liquide, Inc. - Fremont CA
Air Liquide America, L.P. - Houston TX
Jansen Combustion and Boiler Technologies, Inc. - Woodinville WA

F23N 518

110345, 110188, 110238, 110214, 431 10, 162 301

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.

6408771, Jun 25, 2002

Sep 9, 1999

09/392418

Louis C. Philippe - Versailles, FR
Eric L. Duchateau - Gieres, FR
David R. Scheeff - Marietta GA
Arie Verloop - Kirkland WA
Edward C. Dye - Bothell WA

Air Liquide America Corporation - Houston TX
American Air Liquide - Fremont CA
LAir Liquide Societe Anonyme pour lEtude et, lExploitation des Procedes Georges Claude - Paris
Jansen Combustion and Boiler Technologies, Inc. - Woodinville WA

F23G 704

110348, 110238, 110214, 110215, 431 10, 162 31, 122 7 C

Methods are presented to increase the throughput of a recovery boiler equipped with at least primary and secondary levels of injection of air. The methods comprise operating the recovery boiler with a third level of oxidant injection below or at the same level as the secondary level, and oxygen enrichment applied to at least the secondary level and said third level.

5992337, Nov 30, 1999

Sep 26, 1997

8/937290

Louis C. Philippe - Versailles, FR
Eric L. Duchateau - Gieres, FR
David R. Scheeff - Marietta GA
Arie Verloop - Kirkland WA
Edward C. Dye - Bothell WA

Air Liquide America Corporation - Houston TX
American Air Liquide, Inc. - Walnut Creek CA
l'Air Liquide, Societe Anonyme Pour l'Etude et, l'Exploitation des
Procedes Georges Claude - Paris
Jansen Combustion and Boiler Technologies, Inc. - Woodinville WA

F23L 902, D21C 1112

110348

Methods of increasing the throughput of recovery boilers equipped with at least two levels of injection of air, the methods improving the thermal efficiency of the boiler with oxygen enrichment of the air in at least one level of the combustion air system, at or above the secondary air level. In one method, a black liquor recover boiler having two levels of air injection is retrofitted with a third level of oxidant injection below or at the same level as the original secondary air, and oxygen enrichment is applied to at least the original secondary air stream and the third level air stream. A preferred method is for the third level to be placed at or close to the same level as the black liquor injector ports.