Patents by Inventor Yunquan Liu

Yunquan 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).

  • Publication number: 20140230316
    Abstract: Processes for thermal conversion of biomass are provided. The processes involve upgrading the pyrolysis vapor from a pyrolysis reactor. The steps include thermally converting a biomass feedstock in a pyrolysis reactor, recovering a pyrolysis vapor from the reactor, passing the pyrolysis vapor in contact with a cracking catalyst, a water-gas shift reaction catalyst, a hydrotreating catalyst, and an acid catalyst, and converting the resulting upgraded pyrolysis vapor into a liquid product. The resulting biooil liquid product is more refined, and the overall processes offer economic and energy efficiency.
    Type: Application
    Filed: February 21, 2013
    Publication date: August 21, 2014
    Applicant: Chevron U.S.A. Inc.
    Inventors: Yunquan Liu, Armando Joseph Belardinelli, Curtis L. Krause
  • Publication number: 20140230318
    Abstract: Processes for thermal conversion of biomass are provided. The processes involve upgrading the pyrolysis vapor from a pyrolysis reactor. The steps include thermally converting a biomass feedstock in a pyrolysis reactor, recovering a pyrolysis vapor from the reactor, passing the pyrolysis vapor in contact with a cracking catalyst, a water-gas shift reaction catalyst, and a hydrotreating catalyst, and converting the resulting upgraded pyrolysis vapor into a liquid product. The resulting biooil liquid product is more refined, and the overall processes offer economic and energy efficiency.
    Type: Application
    Filed: February 21, 2013
    Publication date: August 21, 2014
    Applicant: Chevron U.S.A. Inc.
    Inventors: Yunquan Liu, Armando Joseph Belardinelli, Curtis L. Krause
  • Publication number: 20140230317
    Abstract: Processes for thermal conversion of biomass are provided. The processes involve upgrading the pyrolysis vapor from a pyrolysis reactor. The steps include thermally converting a biomass feedstock in a pyrolysis reactor, recovering a pyrolysis vapor from the reactor, passing the pyrolysis vapor in contact with a water-gas shift reaction catalyst and a hydrotreating catalyst, and converting the resulting upgraded pyrolysis vapor into a liquid product. The resulting biooil liquid product is more refined, and the overall processes offer economic and energy efficiency.
    Type: Application
    Filed: February 21, 2013
    Publication date: August 21, 2014
    Applicant: Chevron U.S.A. Inc.
    Inventors: Yunquan Liu, Armando Joseph Belardinelli, Curtis L. Krause
  • Publication number: 20140230319
    Abstract: Processes for thermal conversion of biomass are provided. The processes involve upgrading the pyrolysis vapor from a pyrolysis reactor. The steps include thermally converting a biomass feedstock in a pyrolysis reactor, recovering a pyrolysis vapor from the reactor, passing the pyrolysis vapor in contact with an acid catalyst in the presence of alcohol, and converting the resulting upgraded pyrolysis vapor into a liquid product. The resulting biooil liquid product is more refined, and the overall processes offer economic and energy efficiency.
    Type: Application
    Filed: February 21, 2013
    Publication date: August 21, 2014
    Applicant: Chevron U.S.A. Inc.
    Inventors: Yunquan Liu, Armando Joseph Belardinelli, Curtis L. Krause
  • Patent number: 8241374
    Abstract: The present invention discloses a fluidized bed system for the single step reforming technology for the production of hydrogen. Single step reforming combines the steam methane reforming, water gas shift, and carbon dioxide removal in a single step process of hydrogen generation. In the present invention, to address the heat transfer and the replenishment issues associated with single step reforming, the sorbent particles are fluidized. This fluidization allows the sorbent particles to be regenerated and consequently allows the optimal operating conditions for single step reforming to be maintained.
    Type: Grant
    Filed: December 15, 2006
    Date of Patent: August 14, 2012
    Assignee: Texaco Inc.
    Inventors: Farshad Bavarian, James F. Stevens, Balaji Krishnamurty, Yunquan Liu, Curtis L. Krause, Lixin You, Daniel G. Casey
  • Patent number: 8062392
    Abstract: The present invention discloses a system for biomass treatment which addresses the need to find economical solutions to transport biomass. In the present invention, small, distributed gasifiers convert the biomass into synthesis gas (“syngas”). The syngas is then transported via a pipeline network to a central fuel production facility.
    Type: Grant
    Filed: December 17, 2008
    Date of Patent: November 22, 2011
    Assignee: Texaco Inc.
    Inventors: Paul F. Bryan, Yunquan Liu, Curtis L. Krause
  • Patent number: 7964176
    Abstract: Relates to a process and apparatus that improves the hydrogen production efficiency for small scale hydrogen production. According to one aspect, the process provides heat exchangers that are thermally integrated with the reaction steps such that heat generated by exothermic reactions, combustion and water gas shift, are arranged closely to the endothermic reaction, steam reformation, and heat sinks, cool natural gas, water and air, to minimize heat loss and maximize heat recovery. Effectively, this thermally integrated process eliminates excess piping throughout, reducing initial capital cost.
    Type: Grant
    Filed: March 29, 2005
    Date of Patent: June 21, 2011
    Assignees: Chevron U.S.A. Inc., Modine Manufacturing Company
    Inventors: Curtis L. Krause, Kevin H. Nguyen, Bhaskar Balasubramanian, Yunquan Liu, Jeroen Valensa, Michael J. Reinke, Mark G. Voss, Todd M. Bandhauer
  • Patent number: 7832364
    Abstract: The present invention discloses a heat transfer unit which integrates a boiler and a gas preheater for steam generation and gas preheating. In one embodiment, the heat transfer unit of the present invention may be used in fuel processing applications. In this embodiment, the heat transfer unit may be located downstream of a combustor such as an anode tailgas oxidizer.
    Type: Grant
    Filed: December 14, 2006
    Date of Patent: November 16, 2010
    Assignee: Texaco Inc.
    Inventor: Yunquan Liu
  • Publication number: 20100150794
    Abstract: The present invention discloses a system for biomass treatment which addresses the need to find economical solutions to transport biomass. In the present invention, small, distributed gasifiers convert the biomass into synthesis gas (“syngas”). The syngas is then transported via a pipeline network to a central fuel production facility.
    Type: Application
    Filed: December 17, 2008
    Publication date: June 17, 2010
    Applicant: Texaco Inc.
    Inventors: Paul F. Bryan, Yunquan Liu, Curtis L. Krause
  • Patent number: 7578669
    Abstract: The present invention discloses a hybrid combustor, such as an anode tailgas oxidizer (ATO), for fuel processing applications which combines both flame and catalytic type burners. The hybrid combustor of the present invention combines the advantages of both flame and catalytic type burners. The flame burner component of the hybrid combustor is used during start-up for the preheating of the catalytic burner component. As soon as the catalytic burner bed is preheated or lit off, the flame burner will be shut off. Optionally, the hybrid combustor may also include an integrated heat recovery unit located downstream of the catalytic burner for steam generation and for the preheating of the feed for a reformer, such as an autothermal reformer.
    Type: Grant
    Filed: December 14, 2006
    Date of Patent: August 25, 2009
    Assignee: Texaco Inc.
    Inventors: Yunquan Liu, Curtis L. Krause, Kevin H. Nguyen
  • Publication number: 20090165368
    Abstract: A process for transitioning from gaseous fuel reformation to liquid fuel reformation has been invented. The process comprises a series of control steps wherein an autothermal reforming reactor's temperature can substantially be stable and satisfactory hydrogen concentration and selectivity can be achieved for producer gas during the transition process. The temperature is controlled by, for example, adjusting the air and water feed. Formulas and algorithms for writing control programs have also been developed.
    Type: Application
    Filed: May 30, 2008
    Publication date: July 2, 2009
    Inventors: Yunquan Liu, Curtis L. Krause, Dennis P. Essl
  • Publication number: 20080141951
    Abstract: The present invention discloses a heat transfer unit which integrates a boiler and a gas preheater for steam generation and gas preheating. In one embodiment, the heat transfer unit of the present invention may be used in fuel processing applications. In this embodiment, the heat transfer unit may be located downstream of a combustor such as an anode tailgas oxidizer.
    Type: Application
    Filed: December 14, 2006
    Publication date: June 19, 2008
    Applicant: Texaco Inc.
    Inventor: Yunquan Liu
  • Publication number: 20080141675
    Abstract: The present invention discloses a hybrid combustor, such as an anode tailgas oxidizer (ATO), for fuel processing applications which combines both flame and catalytic type burners. The hybrid combustor of the present invention combines the advantages of both flame and catalytic type burners. The flame burner component of the hybrid combustor is used during start-up for the preheating of the catalytic burner component. As soon as the catalytic burner bed is preheated or lit off, the flame burner will be shut off. Optionally, the hybrid combustor may also include an integrated heat recovery unit located downstream of the catalytic burner for steam generation and for the preheating of the feed for a reformer, such as an autothermal reformer.
    Type: Application
    Filed: December 14, 2006
    Publication date: June 19, 2008
    Applicant: Texaco Inc.
    Inventors: Yunquan Liu, Curtis L. Krause, Kevin H. Nguyen
  • Publication number: 20080145309
    Abstract: The present invention discloses a fluidized bed system for the single step reforming technology for the production of hydrogen. Single step reforming combines the steam methane reforming, water gas shift, and carbon dioxide removal in a single step process of hydrogen generation. In the present invention, to address the heat transfer and the replenishment issues associated with single step reforming, the sorbent particles are fluidized. This fluidization allows the sorbent particles to be regenerated and consequently allows the optimal operating conditions for single step reforming to be maintained.
    Type: Application
    Filed: December 15, 2006
    Publication date: June 19, 2008
    Applicant: Texaco Inc.
    Inventors: Farshad Bavarian, James F. Stevens, Balaji Krishnamurty, Yunquan Liu, Curtis L. Krause, Lixin You, Daniel G. Casey
  • Publication number: 20060225349
    Abstract: Relates to a process and apparatus that improves the hydrogen production efficiency for small scale hydrogen production. According to one aspect, the process provides heat exchangers that are thermally integrated with the reaction steps such that heat generated by exothermic reactions, combustion and water gas shift, are arranged closely to the endothermic reaction, steam reformation, and heat sinks, cool natural gas, water and air, to minimize heat loss and maximize heat recovery. Effectively, this thermally integrated process eliminates excess piping throughout, reducing initial capital cost.
    Type: Application
    Filed: March 29, 2005
    Publication date: October 12, 2006
    Inventors: Curtis Krause, Kevin Nguyen, Bhaskar Balasubramanian, Yunquan Liu
  • Patent number: D676597
    Type: Grant
    Filed: May 15, 2012
    Date of Patent: February 19, 2013
    Assignee: Asia Vital Components Co., Ltd.
    Inventors: Ming-Wei Zhu, Yunquan Liu