초록 ▼

Disclosed herein are combustion systems, power plants, and flue gas treatment systems that incorporate sweep-based membrane separation units to remove carbon dioxide from combustion gases. In its most basic embodiment, the invention is a combustion system that includes three discrete units: a combus

Disclosed herein are combustion systems, power plants, and flue gas treatment systems that incorporate sweep-based membrane separation units to remove carbon dioxide from combustion gases. In its most basic embodiment, the invention is a combustion system that includes three discrete units: a combustion unit, a carbon dioxide capture unit, and a sweep-based membrane separation unit. In a preferred embodiment, the invention is a power plant including a combustion unit, a power generation system, a carbon dioxide capture unit, and a sweep-based membrane separation unit. In yet another embodiment, the invention is a flue gas treatment system that incorporates three membrane separation units with a carbon dioxide liquefaction unit.

대표청구항 ▼

We claim: 1. A combustion system adapted to control carbon dioxide emissions, comprising:(a) a combustion unit configured to combust a mixture of fuel and air, oxygen-enriched air, or oxygen, thereby producing an exhaust stream containing carbon dioxide;(b) a carbon dioxide capture unit configured t

We claim: 1. A combustion system adapted to control carbon dioxide emissions, comprising:(a) a combustion unit configured to combust a mixture of fuel and air, oxygen-enriched air, or oxygen, thereby producing an exhaust stream containing carbon dioxide;(b) a carbon dioxide capture unit configured to remove a portion of carbon dioxide in concentrated form from the exhaust stream, to create an off-gas stream from the capture unit that is less concentrated in carbon dioxide than the exhaust stream from the combustion unit; and(c) a sweep-based membrane separation unit, comprising(i) at least one membrane having a feed side and a permeate side, where the at least one membrane is selectively permeable to carbon dioxide over nitrogen and to carbon dioxide over oxygen,(ii) means for passing at least a portion of the off-gas stream generated from the carbon dioxide capture step across the feed side of the at least one membrane,(iii) means for passing air, oxygen-enriched air, or oxygen as a sweep stream across the permeate side of the at least one membrane,(iv) means for withdrawing from the feed side of the at least one membrane a carbon-dioxide depleted vent stream, and(vi) means for withdrawing from the permeate side of the at least one membrane a permeate stream comprising oxygen and carbon dioxide, and to pass the permeate stream to the combustion unit as at least part of the air, oxygen-enriched air, or oxygen to the combustion unit.