US 10,260,377 B2Granted

Generating steam turbine performance maps

AssigneeWoodward, Inc.

InventorsTena K. Britt, Scott David Oceanak, Dave Rubenthaler, Aaron Russo

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Abstract

In some aspects, a steam turbine system includes a high-pressure turbine section; a low-pressure turbine section; a high-pressure control valve operable to provide an adjustable flow of steam into the high-pressure turbine section; a low-pressure control valve operable to provide an adjustable flow of steam into the low-pressure turbine section; a controller associated with the high-pressure control valve and the low-pressure control valve. The controller is operable to: receive measurements of three or more different operating points of the steam turbine system, the measurements of each of the three or more different operating points including a position of the high-pressure control valve, a position of the low-pressure control valve, and two of process variables of the steam turbine system; calculate coefficients of a steam performance map of the steam turbine system based on the measurements; and generate the steam performance map based on the coefficients.

Claims20

Dependent claims

A steam turbine system comprising:

a high-pressure turbine section;
a low-pressure turbine section;
a high-pressure control valve operable to provide an adjustable flow of steam into the high-pressure turbine section;
a low-pressure control valve operable to provide an adjustable flow of steam into the low-pressure turbine section;
a controller associated with the high-pressure control valve and the low-pressure control valve, the controller programmed to, during operation of the steam turbine system:
change a pressure or flow demand of the steam turbine system;
in response to the change of the pressure or flow demand of the steam turbine system, measure a response to the change of the pressure or flow demand of the steam turbine system;
change a speed or load demand of the steam turbine system;
in response to the change of the speed or load demand of the steam turbine system, measure a response to the change of the speed or load demand of the steam turbine system;
wherein the response to the change of the pressure or flow demand of the steam turbine system and the response to the change of the speed or load demand of the steam turbine system comprises measurements of three or more different operating points of the steam turbine system, the measurements of each of the three or more different operating points including a position of the high-pressure control valve, a position of the low-pressure control valve, and two of process variables of the steam turbine system;
calculate coefficients of a steam performance map of the steam turbine system based on the measurements of each of the three or more different operating points, the steam performance map representing a first relationship between the position of the high-pressure control valve and the two of the process variables of the steam turbine system, and a second relationship between the position of the low-pressure control valve and the two of the process variables of the steam turbine system;
and
generate the steam performance map of the steam turbine system based on the coefficients.

10 more elements

A method for generating a steam performance map of a steam turbine system, the steam turbine system comprising a high-pressure control valve, operable to provide an adjustable flow of steam fluid into a high-pressure turbine section, and a low-pressure control valve operable to provide an adjustable flow of steam fluid into a low-pressure turbine section, the method comprising, during operation of the steam turbine system:

changing, by data processing apparatus, a pressure or flow demand of the steam turbine system;
in response to the change of the pressure or flow demand of the steam turbine system, receiving, by the data processing apparatus, a measured response to the change of the pressure or flow demand of the steam turbine system;
changing, by the data processing apparatus, a speed or load demand of the steam turbine system;
in response to the change of the speed or load demand of the steam turbine system, receiving, by the data processing apparatus, a measured response to the change of the speed or load demand of the steam turbine system;
wherein the response to the change of the pressure or flow demand of the steam turbine system and the response to the change of the speed or load demand of the steam turbine system comprises measurements of three or more different operating points of the steam turbine system, the measurements of each of the three or more different operating points comprising a position of the high-pressure control valve, a position of the low-pressure control valve, and two of process variables of the steam turbine system;
calculating, by the data processing apparatus, coefficients of a steam performance map of the steam turbine system based on the measurements of each of the three or more different operating points, the steam performance map representing a first relationship between the position of the high-pressure control valve and the two of the process variables of the steam turbine system, and a second relationship between the position of the low-pressure control valve and the two of the process variables of the steam turbine system;
and
generating, by the data processing apparatus, the steam performance map of the steam turbine system based on the coefficients.

5 more elements

A non-transitory computer-readable medium storing instructions that, when executed by data processing apparatus, perform operations for generating a steam performance map of a steam turbine system that comprises a high-pressure control valve operable to provide an adjustable flow of steam fluid into a high-pressure turbine section and a low-pressure control valve operable to provide an adjustable flow of steam fluid into a low-pressure turbine section, the operations comprising:

receiving, by data processing apparatus, measurements of three or more different operating points of steam turbine system, the measurements of each of the three or more different operating points including a position of the high-pressure control valve, a position of the low-pressure control valve, and two of process variables of the steam turbine system;
calculating, by the data processing apparatus, coefficients of a steam performance map of the steam turbine system based on the measurements of each of the three or more different operating points, the steam performance map representing a first relationship between the position of the high-pressure control valve and the two of the process variables of the steam turbine system, and a second relationship between the position of the low-pressure control valve and the two of the process variables of the steam turbine system, wherein the calculating the coefficients comprises calculating slopes of constant process flows on the steam performance map based on the measurements of each of the three or more different operating points;
and
generating, by the data processing apparatus, the steam performance map of the steam turbine system based on the coefficients.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 15/424,643Filed 3 Feb 2017
Published: US 2018/0223695 A19 Aug 2018
Granted: 16 Apr 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

F01K 7/20
The turbine being of multiple-inlet-pressure type: control means specially adapted therefor
F01D 17/02
Regulating or controlling by varying flow: arrangement of sensing elements
F01D 17/145
By means of shiftable members or valves obturating part of the flow path: by means of valves, e.g. for steam turbines
F01K 7/04
The engines being of multiple-expansion type: control means specially adapted therefor