Patents by Inventor Miyuki KAWATA

Miyuki KAWATA 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).

  • Publication number: 20210125387
    Abstract: An embodiment of the process state analysis device of the present invention is provided with an evaluation value calculation unit and a graph creation unit. The evaluation value calculation unit calculates, within an evaluation value calculation range indicating a target range for calculating evaluation values, an evaluation value for each cluster that is classified on the basis of multi-dimensional process data output from each measurement device. The graph creation unit determines a hue for a graph element for each cluster on the basis of the evaluation value for the cluster as calculated within the evaluation value calculation range, and on the basis of a color reference evaluation value corresponding to a reference hue for the graph element, and creates and outputs a graph representing, for each aggregation unit time interval in a specified display period, the number of nodes belonging to each cluster.
    Type: Application
    Filed: May 23, 2019
    Publication date: April 29, 2021
    Applicant: HITACHI, LTD.
    Inventors: Miyuki KAWATA, Seunghwan PARK, Yoshiyuki TAKAMORI
  • Patent number: 10385736
    Abstract: There is provided a combined cycle power plant in which a high-pressure steam turbine and an intermediate-pressure steam turbine can operate in a state where amounts of thermal effect thereof are close to a limit value, and capable of reducing start-up time. A combined cycle power plant includes: an exhaust heat recovery boiler that includes a high-pressure superheater which superheats steam for a high-pressure steam turbine, and a reheater which reheats steam for an intermediate-pressure steam turbine; bypass pipes through which steam bypasses the high-pressure superheater and the reheater; bypass valves that regulate flow rates of steam which flows through the bypass pipes; and a bypass controller that controls the bypass valves such that a difference between thermal effect-amount margins of the turbines is decreased.
    Type: Grant
    Filed: July 20, 2016
    Date of Patent: August 20, 2019
    Assignee: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Tatsuro Yashiki, Yasuhiro Yoshida, Takuya Yoshida, Miyuki Kawata, Eunkyeong Kim, Kazunori Yamanaka, Norihiro Iyanaga, Fumiyuki Suzuki
  • Patent number: 10386826
    Abstract: To provide a start-up control device and a start-up control method for a power plant capable of changing the start-up completion estimated time to a desired time simply and safely while starting the power plant.
    Type: Grant
    Filed: July 21, 2016
    Date of Patent: August 20, 2019
    Assignee: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Miyuki Kawata, Yasuhiro Yoshida, Takuya Yoshida, Tatsuro Yashiki, Eunkyeong Kim, Kazunori Yamanaka, Norihiro Iyanaga, Atsushi Yamashita
  • Patent number: 9863283
    Abstract: A steam turbine power plant includes a life consumption amount calculator configured to calculate life consumption amounts of a turbine rotor based on a value measured by a measurer, a thermal stress limit update timing determining device configured to determine a time when thermal stress limits are updated, an accumulated life consumption amount calculator configured to calculate accumulated life consumption amounts of the turbine rotor when the thermal stress limits are updated, a planned life consumption amount setting device configured to set planned life consumption amounts of the turbine rotor based on the accumulated life consumption amounts of the turbine rotor, a thermal stress limit calculator configured to calculate and update the thermal stress limits based on the planned life consumption amounts of the turbine rotor, and a plant command value calculator configured to calculate a plant command value based on the thermal stress limits.
    Type: Grant
    Filed: November 4, 2014
    Date of Patent: January 9, 2018
    Assignee: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Tatsuro Yashiki, Yukinori Katagiri, Takuya Yoshida, Miyuki Kawata, Yasuhiro Yoshida, Eunkyeong Kim, Kenichiro Nomura, Kazunori Yamanaka, Fumiyuki Suzuki, Norihiro Iyanaga
  • Publication number: 20170254225
    Abstract: A steam turbine plant of the present invention includes a heat source device that heats a low temperature fluid by a heat source medium to obtain a high temperature fluid, a steam generating device that generates steam by heat exchange with the high temperature fluid, a steam turbine that is driven by the steam, a heating flow path that is disposed on an outer surface of a casing of the steam turbine, a high temperature fluid supply passage that is branched from a flow path of the high temperature fluid in the steam generating device, is connected to the heating flow path, and supplies the high temperature fluid to the heating flow path, and a high temperature fluid flow rate regulating device that regulates a flow rate of the high temperature fluid flowing through the high temperature fluid supply passage.
    Type: Application
    Filed: January 27, 2017
    Publication date: September 7, 2017
    Inventors: Eunkyeong KIM, Yasuhiro YOSHIDA, Takuya YOSHIDA, Tatsuro YASHIKI, Miyuki KAWATA, Kazunori YAMANAKA, Norihiro IYANAGA, Fumiyuki SUZUKI
  • Publication number: 20170022847
    Abstract: There is provided a combined cycle power plant in which a high-pressure steam turbine and an intermediate-pressure steam turbine can operate in a state where amounts of thermal effect thereof are close to a limit value, and capable of reducing start-up time. A combined cycle power plant includes: an exhaust heat recovery boiler that includes a high-pressure superheater which superheats steam for a high-pressure steam turbine, and a reheater which reheats steam for an intermediate-pressure steam turbine; bypass pipes through which steam bypasses the high-pressure superheater and the reheater; bypass valves that regulate flow rates of steam which flows through the bypass pipes; and a bypass controller that controls the bypass valves such that a difference between thermal effect-amount margins of the turbines is decreased.
    Type: Application
    Filed: July 20, 2016
    Publication date: January 26, 2017
    Inventors: Tatsuro YASHIKI, Yasuhiro YOSHIDA, Takuya YOSHIDA, Miyuki KAWATA, Eunkyeong KIM, Kazunori YAMANAKA, Norihiro IYANAGA, Fumiyuki SUZUKI
  • Publication number: 20170023933
    Abstract: To provide a start-up control device and a start-up control method for a power plant capable of changing the start-up completion estimated time to a desired time simply and safely while starting the power plant.
    Type: Application
    Filed: July 21, 2016
    Publication date: January 26, 2017
    Inventors: Miyuki KAWATA, Yasuhiro YOSHIDA, Takuya YOSHIDA, Tatsuro YASHIKI, Eunkyeong KIM, Kazunori YAMANAKA, Norihiro IYANAGA, Atsushi YAMASHITA
  • Publication number: 20150121872
    Abstract: Providing a steam turbine power plant that can be safely activated at a high speed while maintaining thermal stress at a level equal to or lower than a limit in consideration of operational results of the plant, and a method for activating the steam turbine power plant.
    Type: Application
    Filed: November 4, 2014
    Publication date: May 7, 2015
    Inventors: Tatsuro YASHIKI, Yukinori KATAGIRI, Takuya YOSHIDA, Miyuki KAWATA, Yasuhiro YOSHIDA, Eunkyeong KIM, Kenichiro NOMURA, Kazunori YAMANAKA, Fumiyuki SUZUKI, Norihiro IYANAGA