Dynamic Steam Turbine Performance Map Generation
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Solution Overview
Problem
Existing steam turbine systems face challenges in maintaining optimal performance due to outdated OEM-provided steam performance maps, which fail to accurately reflect the dynamic changes in system conditions, leading to instability and control quality degradation.
Innovation Solution
A method for generating a steam performance map based on actual measurements of the steam turbine system's responses, allowing for the calculation of coefficients that represent the relationships between control valve positions and process variables, enabling more accurate control and decoupling of controller outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If OEM-provided steam performance maps are used, then initial system setup is simplified, but control accuracy and stability deteriorate due to outdated data not reflecting dynamic changes in system conditions
Solution Approach 1:
The system continuously measures actual steam turbine operating parameters (steam flow rate, rotational speed, extraction pressure) and uses this feedback to dynamically update the performance map coefficients, ensuring the control data reflects current system conditions rather than relying on outdated OEM data
Solution Approach 2:
The performance map is transformed from a static OEM-provided document to a dynamic model where coefficients are continuously updated based on real-time measurements, allowing the system to adapt to changing operating conditions and maintain accuracy throughout the turbine lifecycle
2Measurement precision
If actual measurements are collected and coefficients are calculated to update the steam performance map, then control accuracy improves, but system complexity and measurement requirements increase
Solution Approach 1:
The controller performs multiple functions: it controls the steam turbine operation, collects measurement data from sensors, calculates updated performance map coefficients, and stores the updated map - consolidating what could be separate systems into a single multi-functional controller
Solution Approach 2:
The system updates its own performance map using measurements from its own operating conditions, eliminating the need for external recalibration services or manual coefficient determination while maintaining high control accuracy
3Productivity
If the steam performance map is updated with current operating conditions, then operational efficiency improves, but the difficulty of detecting and measuring system parameters increases
Solution Approach 1:
Complex manual measurement and coefficient determination processes are replaced with automated electronic sensing and computational calculation, where sensors continuously measure parameters and the controller automatically computes updated performance map coefficients
Data Source
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AI summary
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.