Patents by Inventor Hidekazu Takai

Hidekazu Takai 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).

  • Single shaft combined cycle power plant and its operation method
    Patent number: 7013632
    Abstract: According to the invention, there is provided a single shaft combined cycle power plant which can quickly switch from single operation of a gas turbine to combined operation of the gas turbine and a steam turbine, and can quickly increase output power, from low power to high power. The single shaft combined cycle power plant includes a means for maintaining the rotation speed of the steam turbine at a speed slower than but near a rated rotation speed when the steam turbine is separated from a coupled unit of a generator and the gas turbine.
    Type: Grant
    Filed: April 29, 2005
    Date of Patent: March 21, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Hidekazu Takai, Ryouichi Ohkura
  • Single shaft combined cycle power plant and its operation method
    Patent number: 7010922
    Abstract: According to the invention, there is provided a single shaft combined cycle power plant which can quickly switch from single operation of a gas turbine to combined operation of the gas turbine and a steam turbine, and can quickly increase output power, from low power to high power. The single shaft combined cycle power plant includes a means for maintaining the rotation speed of the steam turbine at a speed slower than but near a rated rotation speed when the steam turbine is separated from a coupled unit of a generator and the gas turbine.
    Type: Grant
    Filed: July 28, 2004
    Date of Patent: March 14, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Hidekazu Takai, Ryouichi Ohkura
  • Single shaft combined cycle power plant and its operation method
    Publication number: 20060032232
    Abstract: According to the invention, there is provided a single shaft combined cycle power plant which can quickly switch from single operation of a gas turbine to combined operation of the gas turbine and a steam turbine, and can quickly increase output power, from low power to high power. The single shaft combined cycle power plant includes a means for maintaining the rotation speed of the steam turbine at a speed slower than but near a rated rotation speed when the steam turbine is separated from a coupled unit of a generator and the gas turbine.
    Type: Application
    Filed: October 18, 2005
    Publication date: February 16, 2006
    Inventors: Hidekazu Takai, Ryouichi Ohkura
  • Single shaft combined cycle power plant and its operation method
    Publication number: 20050183422
    Abstract: According to the invention, there is provided a single shaft combined cycle power plant which can quickly switch from single operation of a gas turbine to combined operation of the gas turbine and a steam turbine, and can quickly increase output power, from low power to high power. The single shaft combined cycle power plant includes a means for maintaining the rotation speed of the steam turbine at a speed slower than but near a rated rotation speed when the steam turbine is separated from a coupled unit of a generator and the gas turbine.
    Type: Application
    Filed: April 29, 2005
    Publication date: August 25, 2005
    Inventors: Hidekazu Takai, Ryouichi Ohkura
  • Single shaft combined cycle power plant and its operation method
    Publication number: 20050022497
    Abstract: According to the invention, there is provided a single shaft combined cycle power plant which can quickly switch from single operation of a gas turbine to combined operation of the gas turbine and a steam turbine, and can quickly increase output power, from low power to high power. The single shaft combined cycle power plant includes a means for maintaining the rotation speed of the steam turbine at a speed slower than but near a rated rotation speed when the steam turbine is separated from a coupled unit of a generator and the gas turbine.
    Type: Application
    Filed: July 28, 2004
    Publication date: February 3, 2005
    Inventors: Hidekazu Takai, Ryouichi Ohkura