Patents by Inventor Yoshikazu Moritomo
Yoshikazu Moritomo 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).
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Publication number: 20080172267Abstract: An apparatus or system is used for planning the rotation of part usage between shafts or plants based at least on schedule information relating to operation and inspection-purpose shutdown, attribute information relating to part life, part maintenance periods, and other part attributes, and part information relating to the parts to be used in the rotation.Type: ApplicationFiled: September 4, 2007Publication date: July 17, 2008Applicant: HITACHI, LTD.Inventors: Miyako HOTTA, Yoshitaka KOJIMA, Kenji ARAKI, Yoshikazu MORITOMO
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Patent number: 7286966Abstract: An apparatus or system is used for planning the rotation of part usage between shafts or plants based at least on schedule information relating to operation and inspection-purpose shutdown, attribute information relating to part life, part maintenance periods, and other part attributes, and part information relating to the parts to be used in the rotation.Type: GrantFiled: March 28, 2003Date of Patent: October 23, 2007Assignee: Hitachi, Ltd.Inventors: Miyako Hotta, Yoshitaka Kojima, Kenji Araki, Yoshikazu Moritomo
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Publication number: 20030187530Abstract: An object of the present invention is to provide the apparatuses and systems for planning the rotation of part usage between a plurality of shafts or plants.Type: ApplicationFiled: March 28, 2003Publication date: October 2, 2003Inventors: Miyako Hotta, Yoshitaka Kojima, Kenji Araki, Yoshikazu Moritomo
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Patent number: 5660045Abstract: The present invention has an object to provide a gas turbine combustor which is able to effect stable combustion in a wide range of fuel flow rate. A burner 1 is provided with fuel nozzles 31 and 32. When a fuel flow rate is small, diffusion flame is formed with fuel supplied from the nozzle 31 with a ring-shaped flame stabilizer 11. Next, fuel is supplied from the nozzle 32 to mix with air, reach to the flame stabilizer 11 and be held by the diffusion flame already formed, whereby stable premixed flames are formed in the flame stabilizer 11 from a range of low fuel air ratio. Further, when flame is propagated from the burner 1 to the burner 2, a fuel air ratio at the outer periphery side of the burner 1 is locally raised by the fuel supplied from the nozzle 31, whereby the combustion stability can be raised in a wide range of fuel flow rate and propagation of flame to adjacent burners becomes easy.Type: GrantFiled: July 14, 1995Date of Patent: August 26, 1997Assignee: Hitachi, Ltd.Inventors: Kazuyuki Ito, Tadayoshi Murakami, Nariyoshi Kobayashi, Shigeru Azuhata, Yoshikazu Moritomo
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Patent number: 5630320Abstract: A gas turbine combustor is provides with a stabilizer at a downstream side of a premixing device for premixing and supplying fuel and air into a combustion chamber. The stabilizer has a cylindrical part extending axially from an upstream end thereof to a downstream end and a stabilizing part at the downstream end of the cylindrical part for stabilizing a flame, and the stabilizer is mounted on an inside of the combustor by a plurality of members arranged annularly and secured to the inside of the combustor at their ends, each of the members having a part slidably inserted in an opening of the cylindrical part so as to restrict the stabilizer to move axially while allowing deformation of the stabilizer and another part supporting the upstream end of the cylindrical part so as to restrict radial movement of the stabilizer.Type: GrantFiled: December 13, 1994Date of Patent: May 20, 1997Assignee: Hitachi, Ltd.Inventors: Noriaki Matsuda, Kunihiro Ichikawa, Shigeru Azuhata, Nobuyuki Iizuka, Yoshikazu Moritomo, Yoshiharu Nakayama, Nariyoshi Kobayashi
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Patent number: 5515680Abstract: An apparatus for mixing gaseous fuel and air for combustion, particularly premixing-type combustion in a gas turbine, has a conduit providing a passage for flow of the air with a reverse bend defined by opposed first and second wall portions that bound respectively the outside and the inside of said reverse bend as seen in a longitudinal section. The reverse bend establishes a flow region of air having a velocity gradient extending transversely across the conduit from a high velocity zone adjacent the first side wall portion at the outside of the reverse bend to a low velocity zone. Injection means for the gaseous fuel injects the fuel from the first side wall portion into the high velocity zone with a velocity component transverse to the air flow and in a direction towards the low velocity zone. Rapid and uniform mixing is obtained.Type: GrantFiled: March 18, 1994Date of Patent: May 14, 1996Assignee: Hitachi, Ltd.Inventors: Hidekazu Fujimura, Kazuhito Koyama, Shozo Nakamura, Yoshikazu Moritomo
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Patent number: 5477670Abstract: A control apparatus of a gas turbine combustor for effecting a stable combustion with limited NOx emission through a control of a fuel flow rate according to a turbine output and a control of a flow rate of intake air mixed with the fuel comprises: means for detecting at least one of the temperature and the humidity of an intake air to be taken into the combustor; means for determining and storing, in advance, a stable combustion limit line between a stable combustion region and an unstable combustion region, on a plane of coordinates of a ratio of fuel flow rate/intake air flow rate or an intake air flow rate and the temperature or the humidity of the intake air, on each turbine load; means for detecting an instant operational point of the combustor on the plane of coordinates; and means for correcting an intake air flow rate or a ratio of fuel flow rate to the intake air flow rate according to an increase in the detected temperature or humidity so that the operational point does not cross the stable combustType: GrantFiled: June 14, 1994Date of Patent: December 26, 1995Assignee: Hitachi, Ltd.Inventors: Hiraku Ikeda, Tetsuo Sasada, Isao Sato, Yoshikazu Moritomo, Koji Takahashi, Minoru Takaba
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Patent number: 5339620Abstract: A control apparatus of a gas turbine combustor obtains a stable combustion with limited NOx emission through a control of a fuel flow rate according to a turbine output and a control of a flow rate of intake air mixed with the fuel.Type: GrantFiled: April 22, 1992Date of Patent: August 23, 1994Assignee: Hitachi, Ltd.Inventors: Hiraku Ikeda, Tetsuo Sasada, Isao Sato, Yoshikazu Moritomo, Koji Takahashi, Minoru Takaba
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Patent number: 5259182Abstract: A combustion apparatus comprises a combustor liner forming a combustion chamber, and a swirler for introducing a fuel gas into the combustion chamber in the form of a swirl. The combustor liner has an air film forming device provided on the wall thereof and capable of forming a film of cooling air on the inner peripheral wall of the combustor liner so as to protect the combustor liner from the hot combustion gas in the combustion chamber. The air film forming means is formed such that the flowing direction of the air forming the film becomes the same direction as the swirling direction of the combustion gas, so that the film of the cooling air is not broken by the hot combustion gas.Type: GrantFiled: February 12, 1993Date of Patent: November 9, 1993Assignee: Hitachi, Ltd.Inventors: Kazumi Iwai, Hiromi Koizumi, Kazuhiko Kumata, Yoshikazu Moritomo
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Patent number: 5239831Abstract: A burner comprises at least one swirl member for mixing a fuel with an air previously to burning of the fuel, and at least one eddy generating device which is arranged in a flow of a mixture of the fuel and air to generate an eddy flow in the flow so that the eddy flow maintains a shape of a flame of the burned fuel. The at least one eddy generating device is arranged apart from a downstream end of the swirl member by a fixed sufficient distance so that the shape of the flame maintained by the eddy flow is prevented from moving toward the downstream end of the swirler member.Type: GrantFiled: July 9, 1991Date of Patent: August 31, 1993Assignee: Hitachi, Ltd.Inventors: Michio Kuroda, Nobuyuki Iizuka, Haruo Urushidani, Kazuhiko Kumata, Isao Sato, Tetsuo Sasada, Hajime Toriya, Yoshikazu Moritomo, Yoji Ishibashi, Takashi Ohmori, Shigeru Azuhata