Patents by Inventor Hans E. Wettstein

Hans E. Wettstein has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9181873
    Abstract: A method is provided for CO2 separation from a combined-cycle power plant with exhaust-gas recirculation and CO2 separation. The hot-gas flow is split into a recirculation flow and an exhaust-gas flow before the final turbine stage in the turbine. A first partial flow remains in the turbine and carries out expansion work in the conventional form, before its waste heat is dissipated, for example in a waste-heat boiler, and the gases are recirculated into the inlet flow of the gas turbine. A second partial flow is diverted before the final turbine stage, and emits its waste heat in an HRSG/heat exchanger, before CO2 is separated from the exhaust-gas flow at an increased pressure level.
    Type: Grant
    Filed: July 20, 2011
    Date of Patent: November 10, 2015
    Assignee: ALSTOM TECHNOLOGY LTD
    Inventors: Jürgen Hoffmann, Hans Peter Knopfel, Hans E. Wettstein
  • Publication number: 20120031101
    Abstract: A method is provided for CO2 separation from a combined-cycle power plant with exhaust-gas recirculation and CO2 separation. The hot-gas flow is split into a recirculation flow and an exhaust-gas flow before the final turbine stage in the turbine. A first partial flow remains in the turbine and carries out expansion work in the conventional form, before its waste heat is dissipated, for example in a waste-heat boiler, and the gases are recirculated into the inlet flow of the gas turbine. A second partial flow is diverted before the final turbine stage, and emits its waste heat in an HRSG/heat exchanger, before CO2 is separated from the exhaust-gas flow at an increased pressure level.
    Type: Application
    Filed: July 20, 2011
    Publication date: February 9, 2012
    Applicant: ALSTOM TECHNOLOGY LTD
    Inventors: Jürgen HOFFMANN, Hans Peter KNOPFEL, Hans E. WETTSTEIN
  • Patent number: 6575698
    Abstract: A honeycomb structure is arranged on a stator of a gas turbine and is arranged opposite the moving blades of the gas turbine. The honeycomb structure is composed of metal sheets in such a way that webs having double the sheet thickness are obtained and connections of single thickness are obtained between the webs. The angle &agr; between the circumferential direction of the stator and the webs of double thickness is 5° to 175°. This serves to avoid undesirable efforts such as, for example, overheating during friction at the honeycomb structure of the moving blades of the gas turbine.
    Type: Grant
    Filed: July 3, 2001
    Date of Patent: June 10, 2003
    Assignee: Alstom (Switzerland) Ltd
    Inventors: Alexander Beeck, Ulrich Rathmann, Hans E. Wettstein
  • Publication number: 20020015641
    Abstract: The invention relates to a honeycomb structure (1) which is arranged on a stator of a gas turbine and which is arranged opposite the moving blades of the gas turbine. The honeycomb structure (1) is composed of metal sheets (5) in such a way that webs (3) having double the sheet thickness are obtained and connections (4) of single thickness are obtained between the webs (3). The angle (&agr;) between the circumferential direction (2) of the stator and the webs (3) of double thickness is 5° to 175°. This serves to avoid undesirable effects such as, for example, overheating during friction at the honeycomb structure (1) of the moving blades of the gas turbine.
    Type: Application
    Filed: July 3, 2001
    Publication date: February 7, 2002
    Inventors: Alexander Beeck, Ulrich Rathmann, Hans E. Wettstein