Mitsubishi Hitachi Power Systems, Ltd.

Mitsubishi Power, Ltd.

Tatsuro Yashiki

Yasuhiro Yoshida

Takuya Yoshida

Kazunori Yamanaka

Fumiyuki Suzuki

Norihiro Iyanaga

Eunkyeong Kim

Kenichiro Nomura

Yuichi Takahashi

Miyuki Kawata

Masaaki Tomizawa

Yukinori Katagiri

Naohiro Kusumi

Atsushi Yamashita

Nobuyuki Hokari

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.

Combined cycle power plant and start-up method of the same

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. The start-up control device includes an equipment state quantity acquisition unit acquiring an equipment state quantity of the power plant, a start-up schedule calculation unit calculating a current start-up schedule based on the equipment state quantity and a first thermal stress limiting value and calculating a start-up schedule changing plan based on the equipment state quantity and a second thermal stress limiting value, an equipment operation amount calculation unit calculating an equipment operation amount of the power plant based on the current start-up schedule, a screen display unit displaying respective start-up completion estimated times of the current start-up schedule and the start-up schedule changing plan, and an instruction input unit instructing the start-up schedule calculation unit to perform switching from the current start-up schedule to the start-up schedule changing plan.

Start-up control device and start-up control method for power plant

An activation control apparatus permits activating a steam turbine safely at high speed in response to a power generation plant state. A heat source apparatus heats low-temperature fluid to generate high-temperature fluid, and steam generation equipment generates steam by thermal exchange with the high-temperature fluid. A steam turbine is driven by the steam, and an adjustment apparatus adjusts a plant operation amount. A thermal effect amount prediction calculation device calculates a prediction value for a thermal effect amount for use for activation control of the steam turbine, and a changeover device decides, based on a state value of the power generation plant, the sensitivity of the thermal effect amount to a variation of the plant operation amount and outputs a changeover signal in accordance with the sensitivity. Based on the changeover signal, an adjustment device calculates the plant operation amount so as not to exceed a predetermined limit value.

Activation control apparatus for steam turbine

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.

Steam turbine power plant and method for activating steam turbine power plant

Provided is a steam turbine plant activation control device that can flexibly handle an initial state amount of a steam turbine plant and activate a steam turbine at a high speed. The activation control devicefor the steam turbine plant includes a heat source deviceconfigured to heat a low-temperature fluid using a heat source medium and generate a high-temperature fluid, a steam generatorfor generating steam by thermal exchange with the high-temperature fluid, a steam turbineto be driven by the steam, and adjustersconfigured to adjust operation amounts of the plant.

Activation control device

A start control unit for a steam turbine plant, wherein inputting a measured value of a steam temperature fed to a steam turbine, a measured value or an estimated value of a rotor temperature of the steam turbine, and a measured value of a casing temperature of the steam turbine, and controlling a steam flow rate so as to increase the steam flow rate fed to the steam turbine when a difference between the steam temperature and the rotor temperature is smaller than a first regulated value and a difference between the rotor temperature and the casing temperature is a second regulated value or larger.

Start control unit for steam turbine plant

Disclosed is a steam turbine power plant adapted to start operating safely even if prediction accuracy of its startup constraints cannot be obtained. The system calculates predictive values and current values of startup constraints of a steam turbine from process variables of plant physical quantities, next calculates in parallel both a first control input variable for a heat medium flow controller based on predictive values, and a second control input variable for a main steam control valve based on the current values, and while preferentially selecting the first control input variable, if the first control input variable is not calculated, selects the second control input variable instead. After the selection of at least one of the first and second control input variables, the system outputs an appropriate command value to the heat medium flow controller and the main steam control valve according to the kind of selected control input variable.

Steam turbine power plant

Disclosed is a steam turbine power plant adapted to start operating very efficiently by highly accurate look-ahead control of a plurality of its startup constraints. The power plant includes a fundamental startup constraint prediction devicethat calculates from a control input variable of the controllera prediction period about a fundamental startup constraint which is short in response time, a reference control input variables calculating devicethat calculates such a reference control input variable of the controlleras the value predicted and calculated by the fundamental startup constraint prediction devicewill not exceed a limit value, other startup constraint prediction deviceseach calculating a corresponding prediction period of data about desired one of other startup constraints from the prediction period of reference control input variables data, other control input variable calculating deviceseach calculating corresponding other control input variables of the controllerfrom the value predicted and calculated by the other startup constraint prediction device, and a control signal output deviceorthat outputs a command value to the controllerin accordance with a value selected from the reference control input variable and the other control input variable.

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Tokyo, Japan

Tatsuro Yashiki