Patent ID: 9486736
Filing Date: 2016-11-08
CPC Classification: B01D,F23C,F23J,Y02E,Y02P

Claim Text:
1. A method of cleaning a carbon dioxide rich flue gas containing sulphur dioxide generated in a boiler combusting a fuel in the presence of a gas containing oxygen gas, the method comprising: removing at least 80% of the sulphur dioxide content of the flue gas generated in the boiler in a first gas cleaning device to generate a partly cleaned carbon dioxide rich flue gas, forwarding at least a portion of the partly cleaned carbon dioxide rich flue gas to a second gas cleaning device, the second gas cleaning device being separate from the first gas cleaning device, cooling, in said second gas cleaning device, the partly cleaned carbon dioxide rich flue gas to condense water therefrom, thereby generating a cleaned carbon dioxide rich flue gas having a lower concentration of water vapour than the partly cleaned carbon dioxide rich flue gas, and forwarding at least a portion of the condensed water that is formed in the second gas cleaning device to the first gas cleaning device as make-up water, wherein 50-90% by volume of the partly cleaned carbon dioxide rich flue gas leaving the first gas cleaning device is recirculated to the boiler without such portion being first passed through the second gas cleaning device.