Activation control device

• US 9,771,825 B2
• Filed: 11/03/2014
• Issued: 09/26/2017
• Est. Priority Date: 11/07/2013
• Status: Active Grant

• Current Assignee: Mitsubishi Power Limited (Mitsubishi Heavy Industries, Ltd.)
• Original Assignee: mitsubishi hitachi power systems, ltd. (Mitsubishi Heavy Industries, Ltd.)
• Inventors: Yoshida, Yasuhiro, Yoshida, Takuya, Yashiki, Tatsuro, Katagiri, Yukinori, Kim, Eunkyeong, Nomura, Kenichiro, Yamanaka, Kazunori, Suzuki, Fumiyuki, Iyanaga, Norihiro
• Primary Examiner(s): MATTHIAS, JONATHAN R
• Application Number:
  US14/531,293
• Publication Number:
  US 20150121874A1
• Time in Patent Office: 1,058 Days
• CPC Class Codes: F01D 19/02 dependent on temperature of component parts, e.g. of turbine-casing
• CPC Class Codes: F01K 13/02 Controlling, e.g. stopping or starting
• CPC Class Codes: F01K 7/165 Controlling means specially adapted therefor
• CPC Class Codes: F05D 2260/821 Parameter estimation or prediction
• CPC Class Codes: F05D 2270/44 active, predictive, or anticipative
• CPC Class Codes: F22B 35/00 Control systems for steam boilers for fluidized bed boilers F22B31/0076; regulation or control of steam power plants F01K7/00; for regulating feed-water supply F22D; for controlling superheat temperature F22G5/00; control of combustion F23N; regulating or controlling in general G05

Abstract

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 device 21 for the steam turbine plant includes a heat source device 1 configured to heat a low-temperature fluid using a heat source medium and generate a high-temperature fluid, a steam generator 2 for generating steam by thermal exchange with the high-temperature fluid, a steam turbine 3 to be driven by the steam, and adjusters 11, 12, 13, 14, 15 configured to adjust operation amounts of the plant.

Claims

1. A power plant, comprising:

a heat source device configured to heat a low-temperature fluid using a heat source medium to generate a high-temperature fluid;

a steam generator for generating steam by thermal exchange with the high-temperature fluid;

a steam turbine to be driven by the steam;

an adjuster configured to operate to adjust a plant operation amount;

a first detector which measures the plant operation amount;

a second detector which measures a plant state amount; and

a control device configured to;

input the plant operation amount measured by the first detector and input the plant state amount measured by the second detector, and calculate a predicted state amount of the plant based on the plant operation amount and the plant state amount and calculate a predicted value for at least one constraint to be used to control the activation of the steam turbine based on the predicted state amount of the plant,

calculate, based on an initial state amount of the plant, which is calculated based on a measurement of the second detector, an activation control parameter, which is a coefficient included in a function to set an activation schedule for the heat source, to be used to control the activation of the steam turbine,

calculate at least two requested operation amounts based on the predicted value for the at least one constraint and the activation control parameter, so that the constraint does not exceed a predetermined limit,

select a minimum requested operation amount of the plant among the calculated at least two requested operation amounts, and

calculate a deviation between the predicted state amount of the plant or temporal data of the predicted value of the at least one constraint and an actual state amount of the plant and correct the predicted state amount of the plant or the predicted value of the constraint based on the deviation,

wherein the adjuster operates based on the minimum requested operation amount of the plant selected by the low value selector, thereby adjusting the plant operation amount.

2. The power plant according to claim 1,

wherein the adjuster includes a heat source medium amount adjuster configured to adjust the amount of a heat source medium to be supplied to the heat source device and adjust the amount of heat held by the high-temperature fluid and includes a low-temperature fluid amount adjuster configured to adjust a flow rate of the low-temperature fluid and adjust a flow rate of the high-temperature fluid to be supplied from the heat source device to the steam generator.

3. The power plant according to claim 1,

wherein the constraint includes at least one of a constraint for thermal stress and a constraint for a thermal elongation difference.

4. The power plant according to claim 3,

wherein the constraint includes at least one of a constraint for thermal deformation of a casing and a constraint for a difference in temperature between the inside and outside of the casing.

5. The power plant according to claim 1,

wherein the plant state amount includes a temperature of a predetermined member of the steam turbine and a time elapsed after the stop of the steam turbine and the initial value is a plant state amount before the activation of the steam turbine.

6. The power plant according to claim 1,

wherein the predicted state amount of the plant includes a state amount of the steam that flows in the steam turbine or the metal temperature of the steam turbine.

7. The power plant according to claim 1,

wherein the actual state amount includes the state amount of the plant or the constraint.

8. An activation schedule generation system comprising:

the power plant according to claim 1; and

a plant state prediction circuit configured to simulate characteristics of the steam turbine plant,

wherein the plant operation amount input to the plant state prediction circuit, and the plant state prediction circuit accumulates, in a storage region, the calculated state amount of the plant or temporal data of the constraint and temporal data of the plant operation amount for a time period from the start of the activation of the steam turbine plant to the completion of the activation.

9. An activation plan generation support system comprising:

a user interface configured to receive a target time when the activation of a plant is completed;

a plant initial state calculation circuit for calculating the initial state amount of the plant based on the target time received by the user interface;

the activation schedule generation system according to claim 8 that is configured to acquire the initial state amount of the plant calculated by the initial plant state calculation circuit, calculate a start time of the activation of the steam turbine plant and a time required for the activation, and generate an activation schedule; and

an output device for outputting a relationship between the initial state amount of the plant calculated by the initial plant state calculation circuit and the time required for the activation, the time being calculated by the activation schedule generation system.

10. The activation plan generation support system according to claim 9,

wherein the time required for the activation is expressed as a continuous function for the initial state amount of the plant.

11. The power plant according to claim 1, further comprising:

a power generator configured to convert driving force of the steam turbine into power.