Patents by Inventor Isao Takehara
Isao Takehara 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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Patent number: 8047003Abstract: A combustor comprises a liquid fuel nozzle for injecting liquid fuel to a combustion chamber, and an air supply nozzle disposed around the liquid fuel nozzle and injecting air. The air supply nozzle is disposed such that air is injected from the air supply nozzle in a direction toward an axis of the liquid fuel nozzle. A space is formed around an outlet of the liquid fuel nozzle, through which the liquid fuel is injected from the liquid fuel nozzle to the combustion chamber, upstream of a distal end of the outlet in a direction in which the liquid fuel is injected. Carbonaceous deposits on surrounding surfaces of the outlet of the liquid fuel nozzle can be suppressed regardless of the operating conditions of a combustor.Type: GrantFiled: September 28, 2010Date of Patent: November 1, 2011Assignee: Hitachi, Ltd.Inventors: Shouhei Yoshida, Yoshitaka Hirata, Hiroshi Inoue, Tomoya Murota, Toshifumi Sasao, Akinori Hayashi, Isao Takehara
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Patent number: 8043068Abstract: A Ni—Fe based super alloy having high strength and toughness at high temperatures even when used in high-temperature environments, and a process of producing the super alloy. A turbine disk using the super alloy, a process of producing the turbine disk, a turbine spacer using the super alloy, and a process of producing the turbine spacer, as well as a gas turbine are also provided. The Ni—Fe based super alloy contains not more than 0.03% by weight of C, 14-18% of Cr, 15-45% of Fe, 0.5-2.0% of Al, not more than 0.05% of N, 0.5 to 2.0% of Ti, 1.5-5.0% of Nb, and Ni as a main ingredient.Type: GrantFiled: August 18, 2005Date of Patent: October 25, 2011Assignee: Hitachi, Ltd.Inventors: Shinya Imano, Hiroyuki Doi, Isao Takehara, Shigeo Sakurai
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Patent number: 7891191Abstract: A combustor comprises a liquid fuel nozzle for injecting liquid fuel to a combustion chamber, and an air supply nozzle disposed around the liquid fuel nozzle and injecting air. The air supply nozzle is disposed such that air is injected from the air supply nozzle in a direction toward an axis of the liquid fuel nozzle. A space is formed around an outlet of the liquid fuel nozzle, through which the liquid fuel is injected from the liquid fuel nozzle to the combustion chamber, upstream of a distal end of the outlet in a direction in which the liquid fuel is injected. Carbonaceous deposits on surrounding surfaces of the outlet of the liquid fuel nozzle can be suppressed regardless of the operating conditions of a combustor.Type: GrantFiled: August 24, 2005Date of Patent: February 22, 2011Assignee: Hitachi, Ltd.Inventors: Shouhei Yoshida, Yoshitaka Hirata, Hiroshi Inoue, Tomoya Murota, Toshifumi Sasao, Akinori Hayashi, Isao Takehara
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Publication number: 20110011092Abstract: A combustor comprises a liquid fuel nozzle for injecting liquid fuel to a combustion chamber, and an air supply nozzle disposed around the liquid fuel nozzle and injecting air. The air supply nozzle is disposed such that air is injected from the air supply nozzle in a direction toward an axis of the liquid fuel nozzle. A space is formed around an outlet of the liquid fuel nozzle, through which the liquid fuel is injected from the liquid fuel nozzle to the combustion chamber, upstream of a distal end of the outlet in a direction in which the liquid fuel is injected. Carbonaceous deposits on surrounding surfaces of the outlet of the liquid fuel nozzle can be suppressed regardless of the operating conditions of a combustor.Type: ApplicationFiled: September 28, 2010Publication date: January 20, 2011Inventors: Shouhei YOSHIDA, Yoshitaka Hirata, Hiroshi Inoue, Tomoya Murota, Toshifumi Sasao, Akinori Hayashi, Isao Takehara
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Patent number: 7546741Abstract: A gas turbine which can detect ignition in a combustor regardless of startup conditions of the gas turbine, such as the hot startup or the cold startup. An ignition detecting method for the gas turbine comprises the steps of calculating a difference between the exhaust temperature detected at a particular time before outputting of an ignition command for a combustor and the exhaust temperature detected after the outputting of the ignition command, and determining that the combustor is ignited, when the calculated difference is not less than a predetermined value. As an alternative, the method includes a step of determining that the combustor is ignited, when a change amount or rate of the exhaust temperature exceeds a predetermined value in a predetermined period from the outputting time of the ignition command.Type: GrantFiled: August 19, 2005Date of Patent: June 16, 2009Assignee: Hitachi, Ltd.Inventors: Toshifumi Sasao, Youtarou Kimura, Isao Takehara
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Publication number: 20090068052Abstract: The invention is of a heat resisting martensitic steel comprising, by weight, 0.05 to 0.30% C, not more than 0.50% Si, not more than 0.60% Mn, 8.0 to 13.0% Cr, 0.5 to 3.0% Ni, 1.0 to 3.0% Mo, 0.1 to 1.5% W, 0.5 to 4% Co, 0.05 to 0.35% V, 0.02 to 0.30% in total of one or two elements selected from the group consisting of Nb and Ta, and 0.02 to 0.10% N, wherein a value of the square of a difference between the Ni amount and the Co amount, and the Ni amount are not more than values determined by a straight line drawn on a point A (1.0, 2.7%) and a point B (2.5, 1.0%) in the orthogonal coordinates shown in the attached drawing of FIG. 2 which represents a relationship between the above square value and the Ni amount, and an amount ratio of Mo/(Mo+0.5W) is not less than 0.5. The heat resisting steel is suitably used in various components of a gas turbine.Type: ApplicationFiled: May 21, 2008Publication date: March 12, 2009Applicant: HITACHI, LTD.Inventors: Masahiko Arai, Hirotsugu Kawanaka, Hiroyuki Doi, Isao Takehara, Hidetoshi Kuroki
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Publication number: 20080275620Abstract: A gas turbine which can detect ignition in a combustor regardless of startup conditions of the gas turbine, such as the hot startup or the cold startup. An ignition detecting method for the gas turbine comprises the steps of calculating a difference between the exhaust temperature detected at a particular time before outputting of an ignition command for a combustor and the exhaust temperature detected after the outputting of the ignition command, and determining that the combustor is ignited, when the calculated difference is not less than a predetermined value. As an alternative, the method includes a step of determining that the combustor is ignited, when a change amount or rate of the exhaust temperature exceeds a predetermined value in a predetermined period from the outputting time of the ignition command.Type: ApplicationFiled: July 7, 2008Publication date: November 6, 2008Inventors: Toshifumi Sasao, Youtarou Kimura, Isao Takehara
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Publication number: 20080275619Abstract: A gas turbine which can detect ignition in a combustor regardless of startup conditions of the gas turbine, such as the hot startup or the cold startup. An ignition detecting method for the gas turbine comprises the steps of calculating a difference between the exhaust temperature detected at a particular time before outputting of an ignition command for a combustor and the exhaust temperature detected after the outputting of the ignition command, and determining that the combustor is ignited, when the calculated difference is not less than a predetermined value. As an alternative, the method includes a step of determining that the combustor is ignited, when a change amount or rate of the exhaust temperature exceeds a predetermined value in a predetermined period from the outputting time of the ignition command.Type: ApplicationFiled: July 7, 2008Publication date: November 6, 2008Inventors: Toshifumi Sasao, Youtarou Kimura, Isao Takehara
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Patent number: 7343745Abstract: A gas turbine combustor has a combustion chamber into which fuel and air are supplied, wherein the fuel and the air are supplied into said combustion chamber as a plurality of coaxial jets.Type: GrantFiled: May 25, 2005Date of Patent: March 18, 2008Assignee: Hitachi, Ltd.Inventors: Hiroshi Inoue, Tomomi Koganezawa, Nariyoshi Kobayashi, Isao Takehara
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Patent number: 7313919Abstract: A gas turbine combustor has a combustion chamber into which fuel and air are supplied, wherein the fuel and the air are supplied into said combustion chamber as a plurality of coaxial jets.Type: GrantFiled: February 24, 2004Date of Patent: January 1, 2008Assignee: Hitachi, Ltd.Inventors: Hiroshi Inoue, Tomomi Koganezawa, Nariyoshi Kobayashi, Isao Takehara
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Publication number: 20070200351Abstract: To provide a plant facility which requires no transmission such as reduction gear and speed up gear, thus increasing the plant efficiency. The plant facility has a turbine which rotates at a frequency higher than the electrical power supply frequency, a generator which is directly connected to the turbine and rotates at the same rotating speed with that of the turbine, and an electrical motor which is directly connected to a load apparatus and driven by electricity at a frequency higher than the electrical power supply frequency generated from the generator. The load apparatus is driven at the same rotating speed with that of the electrical motor.Type: ApplicationFiled: January 26, 2007Publication date: August 30, 2007Inventors: Masakazu Miyagi, Tetsuo Sasada, Isao Takehara, Hidetaro Murata
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Patent number: 7200998Abstract: A gas turbine combustor has a combustion chamber into which fuel and air are supplied, wherein the fuel and the air are supplied into said combustion chamber as a plurality of coaxial jets.Type: GrantFiled: May 25, 2005Date of Patent: April 10, 2007Assignee: Hitachi, Ltd.Inventors: Hiroshi Inoue, Tomomi Koganezawa, Nariyoshi Kobayashi, Isao Takehara
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Patent number: 7188476Abstract: A gas turbine combustor has a combustion chamber into which fuel and air are supplied, wherein the fuel and the air are supplied into said combustion chamber as a plurality of coaxial jets.Type: GrantFiled: May 25, 2005Date of Patent: March 13, 2007Assignee: Hitachi, LtdInventors: Hiroshi Inoue, Tomomi Koganezawa, Nariyoshi Kobayashi, Isao Takehara
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Publication number: 20070003897Abstract: In a burner for injecting mixed gas fuel containing at least one of hydrogen and carbon monoxide into a combustion chamber of a gas turbine combustor, the burner includes a fuel nozzle for startup from which liquid fuel is injected into the combustion chamber, and a mixed fuel nozzle disposed around the fuel nozzle for injecting the mixed gas fuel. An air swirler is disposed at a downstream end of the mixed fuel nozzle and has a plurality of flow passages from which compressed air is injected into the combustion chamber, and the mixed fuel nozzle has injection ports disposed in the inner peripheral side of the flow passages of the air swirler. Cooling holes formed in the nozzle surface and positioned to face the combustion chamber introduce a part of the mixed gas fuel injected from the mixed fuel nozzle into the combustion chamber.Type: ApplicationFiled: June 23, 2006Publication date: January 4, 2007Inventors: Hiromi Koizumi, Hiroshi Inoue, Toshifumi Sasao, Isao Takehara
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Patent number: 7143583Abstract: A gas turbine combustor comprises a premixed combustion burner disposed on the periphery of a pilot burner, an approximately cylindrical combustor liner disposed on the downstream side of the premixed combustion burner, which defines a combustion chamber in the liner. The gas turbine combustor is characterized by further comprising flame stabilizers radially disposed at the exit of the premixed combustion burner, and a fuel injection means with which the pilot burner is provided injects at least one of gas fuel and liquid fuel, in which a plurality of air nozzles are provided which are located outside the pilot burner and inside the premixed combustion burner, and which spout out air into the combustion chamber. Adequate combustion can be accomplished with a combustor which is capable of using gas fuel and liquid fuel, and at the same time, NOx can be reduced.Type: GrantFiled: March 7, 2003Date of Patent: December 5, 2006Assignee: Hitachi, Ltd.Inventors: Akinori Hayashi, Shinichi Inage, Hiromi Koizumi, Isao Takehara, Kazuyuki Ito, Toshifumi Sasao, Hidetaro Murata
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Patent number: 7143585Abstract: A turbine power plant includes power generation apparatuses divided into a plurality of modules, a common base mounting thereon the power generation apparatuses and a supporting apparatus for supporting the common base. The common base is constructed so as to be commonly used as a part of a transportation vehicle and as a frame of the power plant.Type: GrantFiled: July 20, 2004Date of Patent: December 5, 2006Assignee: Hitachi, Ltd.Inventors: Hidetoshi Kuroki, Isao Takehara, Yasuyuki Watanabe, Seisaku Takihana
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Patent number: 7117677Abstract: A gas turbine combustor has a combustion chamber into which fuel and air are supplied, wherein the fuel and the air are supplied into said combustion chamber as a plurality of coaxial jets.Type: GrantFiled: July 28, 2004Date of Patent: October 10, 2006Assignee: Hitachi, Ltd.Inventors: Hiroshi Inoue, Tomomi Koganezawa, Nariyoshi Kobayashi, Isao Takehara
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Patent number: 7043924Abstract: A turbine power plant includes power generation apparatuses divided into a plurality of modules, a common base mounting thereon the power generation apparatuses and a supporting apparatus for supporting the common base. The common base is constructed so as to be commonly used as a part of a transportation vehicle and as a frame of the power plant.Type: GrantFiled: February 25, 2002Date of Patent: May 16, 2006Assignee: Hitachi, Ltd.Inventors: Hidetoshi Kuroki, Isao Takehara, Yasuyuki Watanabe, Seisaku Takihana
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Patent number: 7040083Abstract: A gas turbine comprises a compressor for compressing a gas supplied therein and discharging the compressed gas, a combustor in which the discharged gas from the compressor and a fuel are combusted, a turbine to be driven by a combustion gas from the combustor, and a water injection unit which injects water into the gas to be supplied to the compressor, thereby lowering the temperature of the gas to be introduced into the compressor to a temperature lower than the atmospheric temperature, and causing water droplets having been injected in the gas and within the compressor to be vaporized while flowing down therein, wherein the quantity of water spray injection is controlled while monitoring operational conditions of the gas turbine.Type: GrantFiled: July 22, 2004Date of Patent: May 9, 2006Assignee: Hitachi, Ltd.Inventors: Nobuyuki Horii, Isao Takehara, Hidetaro Murata, Motoaki Utamura, Takaaki Kuwahara, Tetsuo Sasada, Fumiyuki Hirose, Yasuhiro Katoh
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Patent number: RE39092Abstract: A gas turbine comprises a compressor for compressing a gas supplied therein and discharging the compressed gas, a combustor in which the discharged gas from the compressor and a fuel are combusted, a turbine to be driven by a combustion gas from the combustor, and a water injection unit which injects water into the gas to be supplied to the compressor, thereby lowering the temperature of the gas to be introduced into the compressor to a temperature lower than the atmospheric temperature, and causing water droplets having been injected in the gas and within the compressor to be vaporized while flowing down therein, wherein the quantity of water spray injection is controlled while monitoring operational conditions of the gas turbine.Type: GrantFiled: November 17, 2004Date of Patent: May 9, 2006Assignee: Hitachi, Ltd.Inventors: Nobuyuki Horii, Isao Takehara, Hidetaro Murata, Motoaki Utamura, Takaaki Kuwahara, Tetsuo Sasada, Fumiyuki Hirose, Yasuhiro Katoh