Patents by Inventor Chih-Hsiung F. Liu

Chih-Hsiung F. Liu 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).

  • Heat exchanger and method for removing deposits from inner surfaces thereof
    Patent number: 5287915
    Abstract: Hot fluids are cooled in a heat exchanger which comprises a housing providing a passage for the hot fluid, and heat exchange surfaces arranged within the housing which surfaces provide a passage for a coolant to and from the housing such that there is no direct contact between the hot fluid and the coolant, and which surfaces are movable within the housing. The heat exchanger is very suitable for cooling synthesis gas obtained in the gasification of coal.
    Type: Grant
    Filed: June 19, 1992
    Date of Patent: February 22, 1994
    Assignee: Shell Oil Company
    Inventors: Chih-Hsiung F. Liu, Lloyd A. Clomburg, Jr., Otto E. Crenwelge, Jr., William G. Gottenberg, Charles V. Sternling
  • Slag deposition detection
    Patent number: 5112366
    Abstract: A method for determining blockage of a coal gasification process quench zone or heat exchanger by monitoring changes in the heat transfer values.
    Type: Grant
    Filed: December 17, 1990
    Date of Patent: May 12, 1992
    Assignee: Shell Oil Company
    Inventor: Chih-hsiung F. Liu
  • Process for inhibition of flyslag deposits
    Patent number: 4897090
    Abstract: Fouling or plugging of surfaces in the heat exchange zone following a coal gasification reaction zone caused by deposition of flyslag is inhibited by addition of an amount of graphite to the synthesis gas at a suitable locus or loci.
    Type: Grant
    Filed: June 27, 1989
    Date of Patent: January 30, 1990
    Assignee: Shell Oil Company
    Inventors: Chih-hsiung F. Liu, Charles V. Sternling
  • Method and apparatus for measure of heat flux through a heat exchange tube
    Patent number: 4595297
    Abstract: The present invention relates to a method and apparatus used to determine the heat flux through a portion of a surface of a heat exchanger tube, using heat flux sensor means that is installed on the inner wall of the heat exchanger tube and send a signal to a connected heat flux meter.
    Type: Grant
    Filed: October 15, 1985
    Date of Patent: June 17, 1986
    Assignee: Shell Oil Company
    Inventors: Chih-hsiung F. Liu, Lynton W. R. Dicks
  • Process for maintaining heat protective layers of solidified synthetic slag within a slagging coal gasifier
    Patent number: 4473379
    Abstract: The performance of a slagging coal gasifier is improved by injecting finely divided particles of noncorrosive slag-like solid material into the gasifier near the zone of combustion at a rate at which heat-protective layers of solidified slag are maintained between that zone and metallic materials located near that zone.
    Type: Grant
    Filed: March 28, 1983
    Date of Patent: September 25, 1984
    Assignee: Shell Oil Company
    Inventor: Chih-Hsiung F. Liu