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Compression stripping of flue gas with energy recovery

United States Patent

May 31, 2005
View the Complete Patent at the US Patent & Trademark Office
U.S. Department of Energy - Visit the Office of the Assistant General Counsel for Technology Transfer & Intellectual Property Website
A method of remediating and recovering energy from combustion products from a fossil fuel power plant having at least one fossil fuel combustion chamber, at least one compressor, at least one turbine, at least one heat exchanger and a source of oxygen. Combustion products including non-condensable gases such as oxygen and nitrogen and condensable vapors such as water vapor and acid gases such as SO.sub.X and NO.sub.X and CO.sub.2 and pollutants are produced and energy is recovered during the remediation which recycles combustion products and adds oxygen to support combustion. The temperature and/or pressure of the combustion products are changed by cooling through heat exchange with thermodynamic working fluids in the power generation cycle and/or compressing and/or heating and/or expanding the combustion products to a temperature/pressure combination below the dew point of at least some of the condensable vapors to condense liquid having some acid gases dissolved and/or entrained and/or directly condense acid gas vapors from the combustion products and to entrain and/or dissolve some of the pollutants while recovering sensible and/or latent heat from the combustion products through heat exchange between the combustion products and thermodynamic working fluids and/or cooling fluids used in the power generating cycle. Then the CO.sub.2, SO.sub.2, and H.sub.2 O poor and oxygen enriched remediation stream is sent to an exhaust and/or an air separation unit and/or a turbine.
Ochs; Thomas L. (Albany, OR), O'Connor; William K. (Lebanon, OR)
The United States of America as represented by the United States Department of Energy (Washington, DC)
10/ 309,251
December 4, 2002
CONTRACTUAL ORIGIN OF THE INVENTION The United States Government has rights in this invention pursuant to employer/employee agreements between the U.S. Department of Energy (DOE) and the inventors.