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

Patent metadata

Field	Value
Publication number	US-9863283-B2
Application number	US-201414532253-A
Country	US
Kind code	B2
Filing date	Nov 4, 2014
Priority date	Nov 5, 2013
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

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.

First claim

What is claimed is:

1. A steam turbine power plant comprising:
a heat source device configured to use a heat source medium to heat a low-temperature fluid and generate a high-temperature fluid;
a steam generator configured to generate steam by the high-temperature fluid;
a steam turbine that is driven by the steam;
a power generator configured to convert driving force of the steam turbine into power;
an adjuster configured to adjust a load of the plant;
a measurer configured to measure state amounts of the plant;
a life consumption amount calculator configured to calculate life consumption amounts of a turbine rotor included in the steam turbine based on the state amounts measured by the measurer;
a life consumption amount storage device configured to store the life consumption amounts of the turbine rotor;
a thermal stress limit update timing determining device configured to determine a time when thermal stress limits of the turbine rotor are updated;
an accumulated life consumption amount calculator configured to accumulate, at a timing when the thermal stress limits of the turbine rotor are updated, life consumption amounts of the turbine rotor after the thermal stress limits are previously updated and calculate the accumulated life consumption amounts of the turbine rotor;
a planned life consumption amount setting device configured to set, based on the accumulated life consumption amounts of the turbine rotor, planned life consumption amounts of the turbine rotor for a time period to a time when the thermal stress limits are next updated;
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, based on the thermal stress limits, a plant command value such that the plant command value does not exceed the thermal stress limits.

2. The steam turbine power plant according to claim 1 , further comprising
a life consumption amount deviation assignment ratio input device configured to input assignment ratios of deviation of life consumption amounts of the turbine rotor to activation modes of the steam turbine,
wherein the planned life consumption amount setting device sets, based on the assignment ratios of the deviation of the life consumption amounts and the accumulated life consumption amounts of the turbine rotor, the planned life consumption amounts for the time period to the time when the thermal stress limits are next updated.

3. The steam turbine power plant according to claim 2 , further comprising
an activation number input device configured to input the number of times of activation in each of the activation modes,
wherein, based on the numbers of the times of the activation, the planned life consumption amount setting device sets the assignment ratios of the deviation of the life consumption amounts of the turbine rotor, the accumulated life consumption amounts of the turbine rotor, and planned life consumption amounts of the turbine rotor for the time period to the time when the thermal stress limits are next updated.

4. A method for activating a steam turbine power plant including a heat source device configured to use a heat source medium to heat a low-temperature fluid and generate a high-temperature fluid, a steam generator configured to generate steam by the high-temperature fluid, a steam turbine that is driven by the steam, a power generator configured to convert driving force of the steam turbine into power, an adjuster configured to adjust a load of the steam turbine power plant, and a measurer configured to measure state amounts of the steam turbine power plant, the method comprising:
calculating life consumption amounts of a turbine rotor included in the steam turbine based on the state amounts measured by the measurer;
storing the life consumption amounts of the turbine rotor;
determining a time when thermal stress limits of the turbine rotor are updated;
accumulating, when the thermal stress limits of the turbine rotor are updated, life consumption amounts of the turbine rotor after the thermal stress limits are previously updated and calculating the accumulated life consumption amounts of the turbine rotor;
setting, based on the accumulated life consumption amounts of the turbine rotor, planned life consumption amounts of the turbine rotor for a time period from the time when thermal stress limits of the turbine rotor are updated to a time when the thermal stress limits are next updated;
calculating and updating the thermal stress limits based on the planned life consumption amounts of the turbine rotor; and
calculating, based on the thermal stress limits, a plant command value such that the plant command value does not exceed the thermal stress limits.

5. The method according to claim 4 , further comprising
inputting assignment ratios of deviation of the life consumption amounts of the turbine rotor to activation modes of the steam turbine,
wherein the planned life consumption amounts for the time period to the time when the thermal stress limits are next updated are set based on the assignment ratios of the deviation of the life consumption amounts and the accumulated life consumption amounts of the turbine rotor.

6. The method according to claim 5 , further comprising
inputting the number of times of activation in each of the activation modes,
wherein the planned life consumption amounts of the turbine rotor for the time period to the time when the thermal stress limits are next updated are set based on the numbers of the times of the activation, the assignment ratios of the deviation of the life consumption amounts of the turbine rotor, and the accumulated life consumption amounts of the turbine rotor.

Assignees

• Mitsubishi Hitachi Power Sys

Inventors

• Yashiki Tatsuro
• Katagiri Yukinori
• Yoshida Takuya
• Kawata Miyuki
• Yoshida Yasuhiro
• KIM Eunkyeong
• Nomura Kenichiro
• Yamanaka Kazunori
• Suzuki Fumiyuki
• Iyanaga Norihiro

Classifications

• F01K7/165

  Controlling means specially adapted therefor · CPC title

• F01K13/02 Primary

  Controlling, e.g. stopping or starting · CPC title

• F22B35/00

  Control systems for steam boilers (for regulating feed-water supply F22D5/00; for controlling superheat temperature F22G5/00) · CPC title

• F05D2260/821

  Parameter estimation or prediction · CPC title