Patents by Inventor Daniel H. Hutchinson

Daniel H. Hutchinson 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).

  • Steam generating system with NO.sub.x reduction
    Patent number: 5040470
    Abstract: A method and system for flue gas recirculation is disclosed which will minimize NOx production from hydrocarbon combustion. In the present invention a furnace having an oxygen-bearing primary source of combustion air, a mixing chamber, a combustion chamber in downstream communication with the mixing chamber and an exhaust section downstream of the combustion chamber is provided with a flue gas recirculation line. The recirculation line establishes communication between the exhaust section and the mixing chamber for the return of combustion products as a secondary source of combustion air which is relatively lean in oxygen and is combined with the primary source of combustion air in the mixing chamber. The ratio of flow rates for the primary and secondary sources of combustion air is controlled by a signal generated by a sensor which senses the oxygen concentration in the mixing chamber.
    Type: Grant
    Filed: November 15, 1990
    Date of Patent: August 20, 1991
    Assignee: Shell Western E&P Inc.
    Inventors: Ruth E. Lofton, Dale E. Robinson, Daniel H. Hutchinson
  • Method and system for flue gas recirculation
    Patent number: 5002484
    Abstract: A method and system for flue gas recirculation is disclosed which will minimize NOx production from hydrocarbon combustion. In the present invention a furnace having an oxygen-bearing primary source of combustion air, a mixing chamber, a combustion chamber in downstream communication with the mixing chamber and an exhaust section downstream of the combustion chamber is provided with a flue gas recirculation line. The recirculation line establishes communication between the exhaust section and the mixing chamber for the return of combustion products as a secondary source of combustion air which is relatively lean in oxygen and is combined with the primary source of combustion air in the mixing chamber. The ratio of flow rates for the primary and secondary sources of combustion air is controlled by a signal generated by a sensor which senses the oxygen concentration in the mixing chamber.
    Type: Grant
    Filed: March 25, 1988
    Date of Patent: March 26, 1991
    Assignee: Shell Western E&P Inc.
    Inventors: Ruth E. Lofton, Dale E. Robinson, Daniel H. Hutchinson