Steam Turbine Startup Pattern Selection via Economic Evaluation
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Solution Overview
Problem
Users face difficulty in easily selecting the most appropriate startup transition pattern for a steam turbine power generation plant, as existing systems do not provide clear merits and demerits of economic efficiency for various transition patterns, making it challenging to choose the optimal startup method.
Innovation Solution
A steam turbine startup support system that includes a startup transition pattern recording device, parameter input device, rotor lifetime recording device, economic efficiency evaluation device, and screen display device, allowing users to input parameters such as fuel cost, electricity selling price, and rotor lifetime, and displaying the economic efficiency evaluation results to facilitate the selection of the most appropriate startup transition pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the startup time is shortened to reduce fuel consumption and opportunity loss, then the economic efficiency is improved, but the thermal stress of the turbine rotor and the expansion difference between the casing and the turbine rotor become large
Solution Approach 1:
The system dynamically adjusts the startup transition pattern based on real-time conditions. It provides multiple startup patterns (normal, optimum, rapid) and allows dynamic selection among them based on fuel costs, rotor lifetime consumption, and operational requirements, enabling the startup process to adapt to changing economic and technical conditions
Solution Approach 2:
The system changes key parameters during the startup process, including rotation speed, load, and control valve operation amount. By dynamically adjusting these parameters according to the selected startup pattern, the system optimizes the balance between startup time and thermal stress, allowing faster startup when economically beneficial while maintaining safety constraints
2Loss of energy
If the rapid startup transition pattern is selected to suppress fuel cost, then the startup time is reduced, but the lifetime consumption amount of the turbine rotor increases
Solution Approach 1:
The system incorporates feedback mechanisms by monitoring rotor lifetime consumption and using it to inform future startup pattern selections. The rotor lifetime recording device tracks cumulative consumption, and this information feeds back into the economic efficiency evaluation, allowing the system to adjust startup strategies based on the rotor's remaining life and usage history
Solution Approach 2:
The system dynamically adjusts startup pattern selection based on the rotor's current lifetime state. When the rotor is new, more aggressive startup patterns may be selected, while as the rotor ages or approaches certain lifetime thresholds, the system automatically selects more conservative patterns to preserve remaining lifetime, creating a dynamic adaptation strategy
3Duration of action of stationary object
If the normal startup transition pattern is selected to minimize the lifetime consumption amount of the turbine rotor, then the rotor lifetime is preserved, but the startup time increases and fuel cost increases
Solution Approach 1:
The system dynamically adjusts startup transition patterns based on real-time conditions including fuel prices, electricity selling prices, and rotor lifetime status. Rather than always using the most conservative pattern, the system adapts its startup strategy to current economic conditions, using normal or optimum patterns when rotor preservation is critical and rapid patterns when economic efficiency is prioritized
4Adaptability or versatility
If multiple startup transition patterns are provided with different economic efficiency characteristics, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The system segments the startup process into distinct transition patterns (normal, optimum, rapid), each with defined characteristics for rotation speed, load, and control valve operation. This segmentation allows the complex startup process to be divided into manageable, pre-defined patterns that can be selected based on current conditions, reducing the complexity of real-time decision-making
Solution Approach 2:
The economic efficiency evaluation device serves multiple functions: it calculates fuel costs, evaluates rotor lifetime consumption, determines opportunity loss, and selects the optimal startup pattern. This multi-functionality consolidates what would otherwise be separate systems into a single integrated device, managing complexity while providing comprehensive adaptability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables users to easily grasp the economic efficiency of various startup transition patterns and select the most appropriate one, optimizing startup times and reducing fuel costs while ensuring rotor lifetime constraints are met, thereby improving operational efficiency and safety.
Implementation Method 1
an expansion difference between the turbine rotor and a casing becomes large due to thermal expansion in accordance with the shortening of the startup time
Data Source
AI summary
There is provided a steam turbine startup support system capable of easily selecting a proper startup transition pattern from various startup transition patterns. In a steam turbine startup support system of the embodiment, an economic efficiency evaluation device performs economic efficiency evaluation regarding the various startup transition patterns recorded in a startup transition pattern recording device based on parameters recorded in a parameter recording device and information relating to a rotor lifetime recorded in a rotor lifetime recording device. Besides, a screen display device displays a result of the economic efficiency evaluation performed by the economic efficiency evaluation device.