Patents by Inventor Hirofumi Okazaki

Hirofumi Okazaki 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).

  • Patent number: 10520196
    Abstract: The present invention provides a multi-can type gas turbine combustor including a plurality of combustors that mix and burn fuel and the air, the combustors being connected by a crossfire tube assembly. The gas turbine cools the crossfire tube assembly without lowering the temperature of a combustion exhaust gas passing through the crossfire tube assembly and prevents thermal deformation and fire damage of the crossfire tube assembly. In a gas turbine according to the present invention, a guide ring that guides a current of the air is provided in a position opposed to air holes. One side end portion of an annular space configured between the guide ring and a crossfire tube assembly is opened to a space on the inside of the crossfire tube assembly. The other end portion is a closed end connected to a partition wall configuring the crossfire tube assembly. The length of an annular space between the air holes and the closed end is set to three times or more as large as the diameter of the air holes.
    Type: Grant
    Filed: August 8, 2017
    Date of Patent: December 31, 2019
    Assignee: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Hirofumi Okazaki, Hirokazu Takahashi
  • Patent number: 10508813
    Abstract: A plurality of gas turbine combustors having a cross fire tube assembly that connects adjacent combustors. The combustors include combustion chambers having annular combustion air passages on outer peripheries thereof. The cross fire tube assembly has a dual pipe configuration including an inner tube that connects the combustion chambers of the adjacent combustors and an outer tube that covers therein the inner tube and connects the combustion air passages of the adjacent combustors. The cross fire tube assembly further has openings disposed between the inner tube and the outer tube of outer peripheral partition walls of the combustion air passages that are connected with the outer tube of the cross fire tube assembly centering on the inner tube. The openings allow combustion air to flow in areas upstream and downstream of the inner tube with respect to a flow of the combustion air flowing through the combustion air passages.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: December 17, 2019
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventor: Hirofumi Okazaki
  • Publication number: 20190137106
    Abstract: In a gas turbine combustor, a sectional shape in a radial direction of either one of an inner peripheral surface of a second inner tube member and an outer peripheral surface of a first inner tube member, in a fitting portion of a crossfire tube assembly, has a plurality of small-curvature portions having a curvature smaller than a reference curvature, the reference curvature being a curvature of a portion at a maximum distance from the center of the sectional shape. This configuration ensures the crossfire tube assembly is cooled, and the Possibility of thermal deformation or fire damage is lowered, without lowering the temperature of a combustion exhaust gas passing through the crossfire tube assembly of the gas turbine combustor.
    Type: Application
    Filed: November 7, 2018
    Publication date: May 9, 2019
    Inventors: Hirofumi OKAZAKI, Tomomi KOGANEZAWA, Hirokazu TAKAHASHI
  • Publication number: 20190063240
    Abstract: A gas turbine has a sealing structure at a connection portion between the transition pieces and a turbine inlet portion. A frame of the transition piece has an inner frame portion extending in the circumferential direction, an outer frame portion situated radially outside the inner frame portion, and a pair of side frame portions provided between both side end portions of the inner frame portion and the outer frame portion. The sealing structure includes an inner circumferential seal member and an outer circumferential seal member for sealing a gap between the inner frame portion and the outer frame portion and the turbine inlet portion, a side seal member for sealing a gap between the adjacent side frame portions, a first obstacle arranged in a gap between first corner portions adjacent to each other, and a second obstacle arranged in a gap between second corner portions adjacent to each other.
    Type: Application
    Filed: August 22, 2018
    Publication date: February 28, 2019
    Inventors: Hirofumi OKAZAKI, Keisuke MIURA
  • Patent number: 10113746
    Abstract: An atomizer includes a mixing chamber for mixing spray fuel and spray medium, a spray fluid flow passage for supplying the spray fluid into the mixing chamber, a spray medium flow passage for supplying the spray medium into the mixing chamber, and an outlet hole for spraying a mixed fluid of the spray fluid and the spray medium which have been mixed in the mixing chamber to the outside. The spray medium flow passage includes a first spray medium supply hole for supplying the spray medium into the mixing chamber, and a second spray medium supply hole for supplying the spray medium into a region more downstream than the first spray medium supply hole in the mixing chamber, and the second spray medium supply hole supplies the spray medium to a region around the outlet hole.
    Type: Grant
    Filed: February 4, 2016
    Date of Patent: October 30, 2018
    Assignee: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Hirofumi Okazaki, Akihito Orii
  • Patent number: 9970356
    Abstract: An atomizer of the invention includes a mixing chamber, spray fluid flow passages supplying a spray fluid to the mixing chamber, a spray medium flow passage supplying a spray medium to the mixing chamber, outlet holes spraying a fluid mixture of the spray fluid and the spray medium, and fluid mixture flow passages connecting the mixing chamber and the outlet holes to each other. The fluid mixture flowing through each of the fluid mixture flow passages joins with each other at a joining section and is sprayed from the outlet hole. The mixing chamber includes a middle ejection hole spraying the spray fluid to the mixing chamber. The middle ejection hole is arranged at a joining section of the spray fluid flow passages. The spray fluid flowing through the spray fluid flow passages joins with each other at the joining section and is sprayed from the middle ejection hole.
    Type: Grant
    Filed: June 11, 2015
    Date of Patent: May 15, 2018
    Assignee: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Hirofumi Okazaki, Akihito Orii
  • Publication number: 20180045416
    Abstract: The present invention provides a multi-can type gas turbine combustor including a plurality of combustors that mix and burn fuel and the air, the combustors being connected by a crossfire tube assembly. The gas turbine cools the crossfire tube assembly without lowering the temperature of a combustion exhaust gas passing through the crossfire tube assembly and prevents thermal deformation and fire damage of the crossfire tube assembly. In a gas turbine according to the present invention, a guide ring that guides a current of the air is provided in a position opposed to air holes. One side end portion of an annular space configured between the guide ring and a crossfire tube assembly is opened to a space on the inside of the crossfire tube assembly. The other end portion is a closed end connected to a partition wall configuring the crossfire tube assembly. The length of an annular space between the air holes and the closed end is set to three times or more as large as the diameter of the air holes.
    Type: Application
    Filed: August 8, 2017
    Publication date: February 15, 2018
    Inventors: Hirofumi OKAZAKI, Hirokazu TAKAHASHI
  • Publication number: 20170284680
    Abstract: A plurality of gas turbine combustors having a cross fire tube assembly that connects adjacent combustors. The combustors include combustion chambers having annular combustion air passages on outer peripheries thereof. The cross fire tube assembly has a dual pipe configuration including an inner tube that connects the combustion chambers of the adjacent combustors and an outer tube that covers therein the inner tube and connects the combustion air passages of the adjacent combustors. The cross fire tube assembly further has openings disposed between the inner tube and the outer tube of outer peripheral partition walls of the combustion air passages that are connected with the outer tube of the cross fire tube assembly centering on the inner tube. The openings allow combustion air to flow in areas upstream and downstream of the inner tube with respect to a flow of the combustion air flowing through the combustion air passages.
    Type: Application
    Filed: January 27, 2017
    Publication date: October 5, 2017
    Applicant: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventor: Hirofumi OKAZAKI
  • Patent number: 9599335
    Abstract: A solid-fuel burner includes: a venturi having a constricting portion where the transverse cross section of a fuel passage is reduced in a fuel nozzle for supplying a solid fuel; and a fuel concentrator for diverting the flow in the nozzle outward in the wake side of the venturi, and the nozzle is formed so that (a) the aperture in the vicinity of an opening portion of a boiler furnace wall surface has a flat shape, (b) cross-sectional shape thereof orthogonal to a nozzle center axis C on the outer peripheral wall of the nozzle is circular in a transverse cross section up to the constricting portion of the venturi, (c) a portion that has a gradually increasing degree of flatness is provided between the constricting portion and the opening portion, and (d) the flat shape in the opening portion is where the degree of flatness reaches a maximum.
    Type: Grant
    Filed: August 9, 2013
    Date of Patent: March 21, 2017
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Toshihiko Mine, Kenji Kiyama, Miki Shimogori, Satoshi Tadakuma, Hitoshi Wakamatsu, Noriyuki Ohyatsu, Koji Kuramashi, Kenichi Ochi, Yusuke Ochi, Hirofumi Okazaki
  • Publication number: 20160377290
    Abstract: A gas turbine combustor has a burner with an inner casing and an outer casing, and an airflow path that supplies air between them. An opening introduces air from an outer circumferential side to an inner circumferential side of the inner casing of the combustor and an obstacle impedes the flow of the air upstream of the opening portion. The obstacle is formed by a perforated plate having an opening ratio representing a ratio of cross-sectional area of an opening portion of the holes formed in the obstacle to the sum of the cross-sectional area of the opening portion of the holes, and the cross-sectional area of the shielding portion that shields the flow of the air is low on an inner circumferential side of the obstacle and high on an outer circumferential side of the obstacle.
    Type: Application
    Filed: June 21, 2016
    Publication date: December 29, 2016
    Inventors: Hirofumi OKAZAKI, Akihito ORII, Tomoki URUNO
  • Patent number: 9494313
    Abstract: Provided are a device and a method for manufacturing a semi-carbonized fuel of a biomass that does not require an external heat source and is capable of suppressing adhesion of tar, condensed water, or the like to a pipe. The device includes a drying device for heating and drying a biomass, a pyrolysis device for decomposing the dried biomass, and a combustion device for supplying heat to the drying device and the pyrolysis device. The pyrolysis device is supplied with a part of a combustion exhaust gas generated in the combustion device, directly mixes the supplied combustion exhaust gas and the biomass to heat and pyrolytically decompose the biomass, and supplies a mixed gas of a generated pyrolysis gas and the combustion exhaust gas to the combustion device. The combustion device is supplied with an air for combustion, combust the supplied mixed gas, and generate the combustion exhaust gas.
    Type: Grant
    Filed: April 6, 2012
    Date of Patent: November 15, 2016
    Assignee: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Hirofumi Okazaki, Akihito Orii, Tetsuma Tatsumi
  • Patent number: 9476588
    Abstract: A boiler operating method operates a boiler by switching between air combustion mode and oxygen combustion mode when burning fossil fuel with first combustion gas and second combustion gas. The second combustion gas compensates for oxygen deficiency in the first combustion gas. The air combustion mode uses air as the first combustion gas and the second combustion gas while the oxygen combustion mode uses mixed gas of combustion flue gas and oxygen-rich gas as the first combustion gas and the second combustion gas, the combustion flue gas being produced when the fossil fuel is burned. By mixing the oxygen-rich gas in the air in the process of switching between air combustion mode and oxygen combustion mode, the air being the first combustion gas used in the air combustion mode, the boiler operating method can switch between the air combustion mode and oxygen combustion mode while maintaining stable combustion.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: October 25, 2016
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Hirofumi Okazaki, Koji Kuramashi, Hideo Okimoto, Kenichi Ochi, Naoya Imooka, Pauli Dernjatin
  • Publication number: 20160230999
    Abstract: An atomizer includes a mixing chamber for mixing spray fuel and spray medium, a spray fluid flow passage for supplying the spray fluid into the mixing chamber, a spray medium flow passage for supplying the spray medium into the mixing chamber, and an outlet hole for spraying a mixed fluid of the spray fluid and the spray medium which have been mixed in the mixing chamber to the outside. The spray medium flow passage includes a first spray medium supply hole for supplying the spray medium into the mixing chamber, and a second spray medium supply hole for supplying the spray medium into a region more downstream than the first spray medium supply hole in the mixing chamber, and the second spray medium supply hole supplies the spray medium to a region around the outlet hole.
    Type: Application
    Filed: February 4, 2016
    Publication date: August 11, 2016
    Inventors: Hirofumi OKAZAKI, Akihito ORII
  • Publication number: 20150361895
    Abstract: An atomizer of the invention includes a mixing chamber, spray fluid flow passages supplying a spray fluid to the mixing chamber, a spray medium flow passage supplying a spray medium to the mixing chamber, outlet holes spraying a fluid mixture of the spray fluid and the spray medium, and fluid mixture flow passages connecting the mixing chamber and the outlet holes to each other. The fluid mixture flowing through each of the fluid mixture flow passages joins with each other at a joining section and is sprayed from the outlet hole. The mixing chamber includes a middle ejection hole spraying the spray fluid to the mixing chamber. The middle ejection hole is arranged at a joining section of the spray fluid flow passages. The spray fluid flowing through the spray fluid flow passages joins with each other at the joining section and is sprayed from the middle ejection hole.
    Type: Application
    Filed: June 11, 2015
    Publication date: December 17, 2015
    Inventors: Hirofumi OKAZAKI, Akihito ORII
  • Publication number: 20150241058
    Abstract: A solid-fuel burner includes: a venturi having a constricting portion where the transverse cross section of a fuel passage is reduced in a fuel nozzle for supplying a solid fuel; and a fuel concentrator for diverting the flow in the nozzle outward in the wake side of the venturi, and the nozzle is formed so that (a) the aperture in the vicinity of an opening portion of a boiler furnace wall surface has a flat shape, (b) cross-sectional shape thereof orthogonal to a nozzle center axis C on the outer peripheral wall of the nozzle is circular in a transverse cross section up to the constricting portion of the venturi, (c) a portion that has a gradually increasing degree of flatness is provided between the constricting portion and the opening portion, and (d) the flat shape in the opening portion is where the degree of flatness reaches a maximum.
    Type: Application
    Filed: August 9, 2013
    Publication date: August 27, 2015
    Applicant: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Toshihiko Mine, Kenji Kiyama, Miki Shimogori, Satoshi Tadakuma, Hitoshi Wakamatsu, Noriyuki Ohyatsu, Koji Kuramashi, Kenichi Ochi, Yusuke Ochi, Hirofumi Okazaki
  • Patent number: 8961170
    Abstract: A pulverized coal thermal power generation system that significantly reduces the amount of NOx emissions from a boiler and does not require a denitration unit is provided. When a denitration unit is not used, performance to remove mercury from a boiler waste gas is reduced. A waste gas purification system for a pulverized coal boiler, that compensates for this is provided. A pulverized coal boiler having a furnace for burning pulverized coal, burners for supplying pulverized coal and air used for combustion into the furnace so as to burn the pulverized coal in an insufficient air state and after-air ports provided on the downstream side of the burners for supplying air used for perfect combustion characterized in that, an air ratio in the furnace is 1.05 to 1.14, and the residence time of a combustion gas from the burner disposed on the uppermost stage to a main after-air port is 1.1 to 3.3 seconds.
    Type: Grant
    Filed: May 14, 2008
    Date of Patent: February 24, 2015
    Assignee: Babcock-Hitachi K.K.
    Inventors: Hisayuki Orita, Masayuki Taniguchi, Akihito Orii, Yuki Kamikawa, Hirofumi Okazaki
  • Patent number: 8714096
    Abstract: A pulverized coal boiler of the present invention is structured so as to form, among upper and lower after-air nozzles, an opening serving as an outlet of the lower after-air nozzle positioned on the upstream side is formed in a rectangular shape, a cylindrical section for defining a minimum flow path area of combustion air flowing through a flow path of the after-air nozzle is installed inside of the lower after-air nozzles along the flow path of the lower after-air nozzle, and a swirl blade for giving a swirl force to the combustion air flowing through the flow path of the after-air nozzles is installed inside of the cylindrical section, and the flow path of the lower after-air nozzles is formed so that a flow path area of the flow path of the after-air nozzles through which the combustion air flows from a position where the cylindrical section is installed toward the opening of each of the lower after-air nozzles is expanded.
    Type: Grant
    Filed: August 3, 2010
    Date of Patent: May 6, 2014
    Assignee: Babcock-Hitachi K.K.
    Inventors: Akihito Orii, Hirofumi Okazaki, Yusuke Ochi
  • Publication number: 20140116359
    Abstract: A burner including a fuel-containing fluid supply nozzle which supplies a fuel-containing fluid, from a connecting part in a fluid transfer flow passage for transferring a fuel-containing fluid including a fuel and a medium for transfer of the fuel, toward an outlet part provided on a furnace wall surface. The nozzle in its cross section perpendicular to the direction of flow of the fluid has a rectangular, elliptical, or substantially elliptical form having major and minor axis parts from a connecting part in the fluid transfer flow passage toward the outlet part provided on the furnace wall surface. Further, the area of a cross section perpendicular to the direction of flow of the fluid is gradually increased from the connecting part in the fluid transfer flow passage toward the outlet part. Air supply nozzle(s) for supplying combustion air are provided on the outer peripheral part of the nozzle.
    Type: Application
    Filed: December 24, 2013
    Publication date: May 1, 2014
    Applicant: BABCOCK-HITACHI KABUSHIKI KAISHA
    Inventors: Kenji KIYAMA, Akira BABA, Takanori YANO, Osamu OKADA, Hirofumi OKAZAKI, Kouji KURAMASHI
  • Publication number: 20140026791
    Abstract: Provided are a device and a method for manufacturing a semi-carbonized fuel of a biomass that does not require an external heat source and is capable of suppressing adhesion of tar, condensed water, or the like to a pipe. The device includes a drying device for heating and drying a biomass, a pyrolysis device for decomposing the dried biomass, and a combustion device for supplying heat to the drying device and the pyrolysis device. The pyrolysis device is supplied with a part of a combustion exhaust gas generated in the combustion device, directly mixes the supplied combustion exhaust gas and the biomass to heat and pyrolytically decompose the biomass, and supplies a mixed gas of a generated pyrolysis gas and the combustion exhaust gas to the combustion device. The combustion device is supplied with an air for combustion, combust the supplied mixed gas, and generate the combustion exhaust gas.
    Type: Application
    Filed: April 6, 2012
    Publication date: January 30, 2014
    Applicant: HITACHI LTD
    Inventors: Hirofumi Okazaki, Akihito Orii, Tetsuma Tatsumi
  • Publication number: 20130340659
    Abstract: In a boiler having plurality of burners arranged on a furnace wall of a furnace, each burner includes a cylindrical fuel nozzle for injecting a mixture of fuel and carrier gas therefor into the furnace; one or more cylindrical air nozzles provided on the outer circumference of the nozzle for injecting combustion air into the furnace, and a wind box for supplying combustion air to the nozzles in common. The wind box is provided with openings through which combustion air flows in from one direction perpendicular to the axial direction of the burner, and is partitioned by a partition wall to form plurality of parallel flow paths for the air flowing in through the openings. Some of the plurality of flow paths are connected to an upper part of the combustion air nozzle, and the other flow paths are connected to a lower part of the nozzle.
    Type: Application
    Filed: February 22, 2011
    Publication date: December 26, 2013
    Applicant: BABCOCK-HITACHI KABUSHIKI KAISHA
    Inventors: Yusuke Ochi, Kouji Kuramashi, Kenji Kiyama, Hirofumi Okazaki