Granted Patent B2

US 12,553,603 · App. 16/862,006 · Granted Feb 17, 2026

Inventors: William A. Fuglevand (Spokane Valley, WA); Alfred T. Volberding (Kirkland, WA)

Assignee: CARBONQUEST, INC.

F23C9/08B01D53/54F22D1/18F23J15/06F23L7/007B01D2257/102

Abstract

Claims (13)

1 . A method for operating a combustion boiler to optimize removal of the CO 2 from the combustion flue gas within a multi-unit residential or commercial building that is operably engaged to provide steam upon demand from at least one unit within the multi-unit residential or commercial building using domestic water to provide the steam for hot water, and/or steam supplied radiant building heater, the method comprising:

upon demand for hot water or building heat by the at least one of the multi-unit residential or commercial building occupants providing air and natural gas to the combustion boiler;

using the combustion boiler to receive domestic water and provide heated water for use by the building occupants and/or steam to provide radiant heat for the residential or commercial building;

monitoring the amount of free oxygen in a combustion burner of the combustion boiler;

controlling the amount of air and natural gas provided to the combustion burner to maintain a free oxygen amount in the combustion burner greater than 3% and combust the air and natural gas within the combustion burner to generate flue gas from the combustion burner, wherein the flue gas generated from the combustion burner has a CO 2 concentration of at least about 10% and a water concentration of about 18%; and

compressing and drying the flue gas to remove water from the flue gas to achieve a water concentration at or below 10 ppm before separating CO 2 from N 2 then liquifying the CO 2 separated from the flue gas.

2 . The method of claim 1 further comprising storing the CO 2 after separating the CO 2 from the flue gas.

3 . The method of claim 2 further comprising transporting the CO 2 after storing the CO 2 .

4 . The method of claim 1 wherein the free oxygen amount is between 3 and 7%.

5 . The method of claim 1 wherein the CO 2 concentration in the flue gas is less than 12%.

6 . The method of claim 1 wherein the CO 2 concentration in the flue gas is between 10 and 12%.

7 . The method of claim 1 wherein the removing the water from the flue gas comprises increasing the concentration of the CO 2 in the flue gas.

8 . The method of claim 1 further comprising providing the flue gas to a desiccant dryer to achieve the water concentration at or below 10 ppm.

Assignments (2)

Continuity (3)

References Cited (165)