Patents Assigned to MITSUBISHI POWER, LTD.
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Patent number: 11021780Abstract: This method for manufacturing a high-temperature component formed of a Ni-based alloy includes a step of subjecting a workpiece of the Ni-based alloy to hot die forging using predetermined dies to form a forge-molded article, the step including: a die/workpiece co-heating substep of heating the workpiece interposed between the dies to a forging temperature; and a hot forging substep of taking out the workpiece and the dies into a room temperature environment and immediately performing hot forging on the workpiece using a press machine. The predetermined dies are formed of another Ni-based superalloy comprising ? and ?? phases, and have features in that: a solvus temperature of the ?? phase is 1050-1250° C.; and the ?? phase precipitates at least 10 vol. % at 1050° C. and has two kinds of forms of intra-grain ?? phase precipitations within the ? phase grains and inter-grain ?? phase precipitations between/among the ? phase grains.Type: GrantFiled: November 16, 2016Date of Patent: June 1, 2021Assignee: Mitsubishi Power, Ltd.Inventors: Atsuo Ota, Shinya Imano
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Patent number: 11021978Abstract: A shroud of a stator vane includes a suction-side passage, a pressure-side passage, and a plurality of rear-end passages. The plurality of rear-end passages are disposed to be aligned in a lateral direction between the suction-side passage extending along a suction-side end surface and the pressure-side passage extending along a pressure-side end surface, and open at a rear end surface. A suction-side first rear-end passage closest to the suction-side passage among the plurality of rear-end passages gradually extends closer to the suction-side passage toward a downstream side. A pressure-side first rear-end passage closest to the pressure-side passage among the plurality of rear-end passages gradually extends closer to the pressure-side passage toward the downstream side.Type: GrantFiled: October 22, 2018Date of Patent: June 1, 2021Assignee: MITSUBISHI POWER, LTD.Inventor: Yoshio Fukui
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Patent number: 11020810Abstract: A method of manufacturing a turbine blade includes a brazing treatment for joining a brazing material to a base material of a turbine blade by heating the base material having the brazing material arranged thereon and melting the brazing material, a stabilizing treatment for heating the base material having been subjected to the brazing treatment; and an aging treatment for heating the base material having been subjected to the stabilizing treatment. The brazing treatment and the stabilizing treatment are performed with a sequential heating treatment.Type: GrantFiled: October 5, 2017Date of Patent: June 1, 2021Assignee: MITSUBISHI POWER, LTD.Inventors: Daisuke Yoshida, Masaki Taneike, Yoshiyuki Inoue, Hisataka Kawai, Hisashi Kitagaki
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Patent number: 11022304Abstract: A combustor is provided with a combustion liner (12) in which a combustion gas flows through the inner peripheral side and a plurality of through-holes (14) are formed, and a sound attenuator (20) having a space-forming member (21) configured to form a space (S) connected to the plurality of through-holes (14) at the outer peripheral side of the combustion liner (12). The space-forming member has a main body having an opening configured to bring an outside and the space in communication with each other, and a lid joined to an outer surface of the main body via a welded portion and configured to protrude outward and close the opening.Type: GrantFiled: January 27, 2020Date of Patent: June 1, 2021Assignee: MITSUBISHI POWER, LTD.Inventors: Kenta Taniguchi, Kuniomi Hirano, Shin Kato, Yoshikazu Matsumura, Shingo Sato
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Patent number: 11018542Abstract: Rotating machinery includes a two-pole rotor, a stator core with seventy-two slots, and three-phase armature windings, as an example. The armature winding has two phase belts per phase. The phase belt includes a first parallel winding and a second parallel winding which are arranged in the stator slots as top coils and bottom coils. When a circumferential mean position of all top coils and bottom coils included in the phase belt is defined as a phase belt center, an arrangement of the first and second parallel windings in the phase belt, as viewed in order of proximity to the phase belt center, is such that the first and second parallel windings are arranged in order of second/first/second/first/first/second/first/second/first/second/second/first parallel windings as the top coils, and the first and second parallel windings are arranged in order of first/second/second/first/second/first/first/second/first/second/second/first parallel windings as the bottom coils connected to the top coils.Type: GrantFiled: August 8, 2019Date of Patent: May 25, 2021Assignee: MITSUBISHI POWER, LTD.Inventors: Kazuhiko Takahashi, Harumasa Tsuchiya
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Publication number: 20210148254Abstract: Provided are a turbine rotor fixing device capable of easily fixing a turbine rotor in a radial direction and an axial direction, and a shipping method of a turbine module. A fixing device (30) of a turbine rotor (11) includes a radial direction fixing jig (32) provided in a gland part (21A) that seals a clearance between the turbine rotor (11) and a turbine casing disposed to cover a periphery of the turbine rotor (11), to fix relative movement of the turbine rotor (11) to the gland part (21A) in a radial direction, and an axial direction fixing jig (31) provided between the turbine rotor (11) and the gland part (21A), to fix relative movement of the turbine rotor (11) to the gland part (21A) in an axis (X) direction.Type: ApplicationFiled: February 12, 2020Publication date: May 20, 2021Applicant: MITSUBISHI POWER, LTD.Inventor: Tomohiko Takakusagi
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Publication number: 20210140016Abstract: A Co based alloy powder includes between 0.08% and 0.25% mass of carbon, 0.1% mass or less of boron, between 10% and 30% mass of chromium, 5% mass or less of iron, and 30% mass or less of nickel; the iron and the nickel in a total amount of 30% mass or less; includes at least one of tungsten and molybdenum in a total amount of between 5% and 12% mass; includes at least one of titanium, zirconium, niobium, tantalum, hafnium, and vanadium in a total amount of between 0.5% mass and 2% mass; includes 0.5% mass or less of silicon, 0.5% mass or less of manganese, and between 0.003% and 0.04% mass of nitrogen; and includes cobalt and impurities as the balance of the powder. Crystal grains included in the cobalt-based alloy powder have segregated cells; the cells have an average size of between 0.15 ?m and 4 ?m.Type: ApplicationFiled: December 26, 2019Publication date: May 13, 2021Applicant: MITSUBISHI POWER, LTD.Inventors: Yuting WANG, Shinya IMANO
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Patent number: 11002640Abstract: A device abnormality diagnosis method for a device to be diagnosed constituting a plant includes: obtaining time-series data of a plurality of state amounts of the plant which are correlated to an abnormality of the device to be diagnosed; a step of obtaining abnormality diagnosis data on the plurality of state amounts by performing pre-processing on at least one state amount of the plurality of state amounts to exclude, from the time-series data on the state amounts, data of the at least one state amount obtained in an exclusion period which is at least a part of a transient state period during which the device to be diagnosed is affected by a state change of another constituent device of the plant; and a step of performing abnormality diagnosis on the device to be diagnosed on the basis of the abnormality diagnosis data of the plurality of state amounts.Type: GrantFiled: September 13, 2016Date of Patent: May 11, 2021Assignee: MITSUBISHI POWER, LTD.Inventors: Hiroyoshi Kubo, Hiromi Aota, Yasunari Shibata, Katsuhiko Yokohama, Yasunori Ishizu, Yoshinori Koyama
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Patent number: 10995956Abstract: A combustor (3) includes: a fuel nozzle configured to inject fuel; a tubular body (24) having a tubular shape in which a combustion region through which combustion gas flows is formed inside, and in which a plurality of slits (50) are formed extending in the circumferential direction at intervals in the circumferential direction; and throttle pieces (60) which are fitted into the slits (50), project radially inward from the inner circumferential side of the tubular body (24), and have a throttle face that extends along the flow direction of the combustion gas as it extends from the radially outer side inward.Type: GrantFiled: March 28, 2017Date of Patent: May 4, 2021Assignee: MITSUBISHI POWER, LTD.Inventors: Shuhei Kajimura, Kenji Miyamoto, Taiki Kinoshita, Kotaro Miyauchi
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Patent number: 10995679Abstract: A flame produced within a premixer is promptly extinguished and a reduction in output power of a gas turbine associated with extinguishment is suppressed.Type: GrantFiled: January 31, 2019Date of Patent: May 4, 2021Assignee: Mitsubishi, Power, Ltd.Inventors: Kazuki Abe, Akinori Hayashi, Yasuhiro Wada, Tetsuma Tatsumi, Shohei Yoshida
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Patent number: 10989069Abstract: A steam turbine cooling unit for a steam turbine includes a coolant steam path provided to penetrate a casing along a superheated steam supply tube to reach a gap; and a coolant steam supplying unit configured to supply coolant steam flowing through the coolant steam path along the superheated steam supply tube to reach the gap, and having: (i) a pressure higher than a pressure of superheated steam to be supplied by the superheated steam supply tube; and (ii) a temperature lower than a temperature of the superheated steam to be supplied by the superheated steam supply tube.Type: GrantFiled: November 17, 2016Date of Patent: April 27, 2021Assignee: MITSUBISHI POWER, LTD.Inventors: Takumi Matsumura, Toyoharu Nishikawa, Katsuhisa Hamada
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Patent number: 10993002Abstract: An acquisition unit is configured to acquire a measurement value of a first state quantity of a target device. A model determination unit is configured to determine a model for estimating a value of a second state quantity of the target device for each evaluation item for management of the target device. An estimation unit is configured to estimate the value of the second state quantity on the basis of the measurement value using the model determined by the model determination unit. A management unit calculates a value of the evaluation item using the value estimated by the estimation unit.Type: GrantFiled: March 26, 2018Date of Patent: April 27, 2021Assignees: MITSUBISHI HEAVY INDUSTRIES, LTD., MITSUBISHI POWER, LTD.Inventors: Shintaro Kumano, Makoto Kishi, Keisuke Yamamoto, Katsuhiko Abe
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Patent number: 10990070Abstract: A state quantity acquiring unit is configured to acquire a state quantity of a turbine. A time calculation unit is configured to calculate an operable time at an over firing operation of the turbine based on a design life of the turbine and a state quantity. A distance calculation unit configured to calculate a Mahalanobis distance based on the state quantity. A determination unit configured to determine whether or not the over firing operation of the turbine is possible by the Mahalanobis distance and the operable time.Type: GrantFiled: December 8, 2016Date of Patent: April 27, 2021Assignee: MITSUBISHI POWER, LTD.Inventors: Yasuoki Tomita, Katsuhiko Abe, Shintaro Kumano, Motoshi Takasu, Etsushi Kanno, Takahiro Kawaguchi, Takayoshi Isoda, Yuki Enomoto, Nobuhiro Osaki, Kazuyuki Misawa, Akihisa Endo, Masao Ogino
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Patent number: 10982556Abstract: An application jig is used when an erosion shield member is applied to a rotor blade member. The application jig includes a body section disposed on a back side of the rotor blade member; a first pressing section provided in the body section and pressing an erosion shield member to be placed at a leading edge of the rotor blade member from the back side; a second pressing section supported by the body section and pressing a trailing edge of the rotor blade member from the back side; and a third pressing section supported by the body section. The third pressing section is disposed to bypass the trailing edge from the back side to a belly side thereof, is pivotable around a pivot shaft provided in the body section, and presses a portion between the leading and trailing edges in a pivoting direction from the belly side.Type: GrantFiled: August 9, 2018Date of Patent: April 20, 2021Assignee: MITSUBISHI POWER, LTD.Inventor: Kazuyoshi Kitamura
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Patent number: 10982719Abstract: There are provided a seal fin, a seal structure, and a turbo machine that can achieve a high leak-suppressing effect and can reduce leak loss of the turbo machine. The disclosure suppresses leak of a fluid from a gap between a first structure being in a static state and a second structure rotating around an axis line and is formed on the first structure so as to extend toward the second structure while keeping a clearance between a tip face thereof on an extending direction and the second structure. The first structure and the second structure face each other in a radius direction with the gap inbetween. A plurality of hollows opening at a tip on the extending direction are arranged along a circumference direction in parallel with each other on a front face facing an upstream side of a flow direction of the fluid.Type: GrantFiled: November 28, 2016Date of Patent: April 20, 2021Assignee: MITSUBISHI POWER, LTD.Inventors: Toyoharu Nishikawa, Yoshihiro Kuwamura, Hiroharu Oyama, Katsuhisa Hamada, Hideaki Sugishita
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Patent number: 10982567Abstract: A condensate and feedwater system includes: a deaerator circulation pump that returns condensate water flowing out from a deaerator to a part of a condensate line between a heater and the deaerator; an apparatus to be supplied with part of the condensate water flowing from the heater toward the deaerator, through a supply line branched from the condensate line; a supply line shutoff valve that switches between communication and interruption of the supply line; and a controller that controls opening/closing of the supply line shutoff valve and driving/stopping of the deaerator circulation pump. The controller closes the supply line shutoff valve from an open state at normal operation and at least temporarily drives the deaerator circulation pump from a stopped state at normal operation, in condenser throttling in which supply of extraction steam of a steam turbine to the heater and the deaerator is reduced as compared to that at normal operation and a deaerator water level control valve is closed.Type: GrantFiled: December 11, 2019Date of Patent: April 20, 2021Assignee: Mitsubishi Power, Ltd.Inventors: Hiroshi Fukunaga, Supriyo Datta
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Patent number: 10975711Abstract: A seal structure is for sealing leakage fluid flowing through a gap between a rotation member rotating about a rotation axis and a stationary member facing the rotation member. The seal structure includes seal fins projecting from a base that is one of the rotation and stationary members toward the other one, the seal fins being spaced apart from each other at a certain interval in an axial direction of the rotation axis; and a step section provided to the other one, the step section including step surfaces facing the seal fins and a riser surface between the adjacent step surfaces, the step surfaces and the riser surface defining a step portion. The seal fins are inclined upstream in a flow direction of the leakage fluid relative to a radial direction perpendicular to the rotation axis. Each seal fin and the base define a corner portion having a curved surface.Type: GrantFiled: November 24, 2016Date of Patent: April 13, 2021Assignee: MITSUBISHI POWER, LTD.Inventors: Yoshihiro Kuwamura, Eiji Konishi, Toyoharu Nishikawa, Shin Nishimoto, Hidekazu Uehara
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Patent number: 10974251Abstract: A pulverizing device includes: a housing; a pulverization table configured to rotate inside the housing; and a throat, disposed inside the housing on a radially outer side of the pulverization table, for forming an upward air flow. The throat includes: an inner ring extending along an outer periphery of the pulverization table; an outer ring, disposed on a radially outer side of the inner ring so as to form an annular flow passage between the inner ring and the outer ring; and a plurality of throat vanes disposed between the inner ring and the outer ring. The following expressions are satisfied: 2.0?L/d?4.0; and 0.5?H/d?1.5, where H is a gap between the inner ring and the outer ring with respect to a radial direction, L is a length of the throat vanes, and ‘d’ is a distance between adjacent two of the throat vanes.Type: GrantFiled: January 13, 2017Date of Patent: April 13, 2021Assignee: MITSUBISHI POWER, LTD.Inventors: Jun Kashima, Shinji Matsumoto, Kosuke Kitakaze, Yasuhito Onishi, Hiroaki Kanemoto
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Patent number: 10975771Abstract: A gas turbine combined cycle plant includes a fuel gas heater configured to heat fuel gas to be supplied to a combustor of a gas turbine using heated water heated by an exhaust heat recovery boiler; a return valve disposed on a heated water returning line to return heated water passing through the heater to the boiler; a dump valve disposed on a condensate line bifurcated from the heated water returning line between the return valve and the heater to return the heated water to a condenser; and a control unit configured to control operation of the return and dump valves. When load of the turbine falls below a lower limit, the control unit closes the return valve and keeps the opening degree of the dump valve at a specified degree to reduce a flow rate of the heated water flowing in the heater for a predetermined time.Type: GrantFiled: April 4, 2018Date of Patent: April 13, 2021Assignee: MITSUBISHI POWER, LTD.Inventors: Yuki Nakazawa, Akihiko Saito, Hiroyuki Nakagawa, Ryo Koto
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Patent number: 10968783Abstract: A thermal power generation system includes: a boiler; at least one steam turbine; a generator; a condenser; at least one low-pressure feed water; a high-pressure feed water pump; at least one high-pressure feed water heater capable of heating water pumped by the high-pressure feed water pump by utilizing extracted steam; a catalyst device including at least one kind of catalyst capable of promoting reduction reaction of nitrogen oxide and oxidation reaction of metallic mercury, the nitrogen oxide and the metallic mercury both being contained in the exhaust gas; at least one mercuric oxide removing device capable of removing mercuric oxide produced by the oxidation reaction of the metallic mercury from the exhaust gas; and an exhaust gas temperature adjustment device capable of adjusting a temperature of the exhaust gas at the catalyst device, by adjusting heating of the water by the at least one high-pressure feed water heater.Type: GrantFiled: February 21, 2017Date of Patent: April 6, 2021Assignee: MITSUBISHI POWER, LTD.Inventors: Yoshinori Nagai, Satoru Sugita, Takanori Nakamoto, Hiroyuki Nosaka, Yoshinori Taguchi, Jun Iwasaki