High- and Medium-Pressure Turbine Valve Control for Thrust Balance
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Solution Overview
Problem
The challenge in steam turbines is to maintain the thrust force within an allowable value to prevent thrust burnout and imbalance due to unbalanced pressures in high-pressure and medium-pressure steam turbines.
Innovation Solution
A control device that acquires pressure values at the inlets of high-pressure and medium-pressure steam turbines and adjusts the valve opening degrees based on these pressures to maintain balance, using proportional integral control and machine learning models to manage thrust forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the valve opening degrees are not controlled according to pressure balance, then the steam turbine can operate independently, but the thrust force becomes unbalanced and exceeds allowable values
Solution Approach 1:
The control device implements feedback control by continuously monitoring the inlet pressures of both turbines and adjusting the valve opening degrees accordingly. The acquisition unit obtains pressure values from pressure gauges, and the control unit modifies valve positions based on pressure differences, creating a closed-loop control system that maintains thrust force balance within allowable limits
Solution Approach 2:
The control device changes the operational parameters (valve opening degrees) of the steam turbines based on real-time pressure measurements. By adjusting the valve opening degrees in response to pressure differences between the first and second turbines, the system dynamically modifies steam flow parameters to maintain balanced thrust forces
2Reliability
If the valve opening degrees are adjusted to balance thrust forces, then the thrust force remains within allowable values, but the control system becomes more complex
Solution Approach 1:
The control device implements feedback control by continuously monitoring the inlet pressures of both turbines and adjusting the valve opening degrees accordingly. The acquisition unit obtains pressure values from pressure gauges, and the control unit modifies valve positions based on pressure differences, creating a closed-loop control system that maintains thrust force balance within allowable limits
Solution Approach 2:
The control device enables the steam turbine system to self-regulate its thrust force balance through automatic pressure monitoring and valve adjustment. The system independently detects pressure imbalances and corrects them without external intervention, making the control process self-service and improving reliability
Data Source
AI summary
This control device comprises: an acquiring unit for acquiring, as a first inlet pressure, a pressure value of first steam on a first inlet side as seen from a first regulating valve of a first turbine that rotates using the first steam, which is supplied from the first inlet via the first regulating valve, and acquiring, as a second inlet pressure, a pressure value of second steam on a second inlet side as seen from a second regulating valve of a second turbine that rotates on the same rotating shaft as the first turbine using the second steam, which is supplied from the second inlet via the second regulating valve; and a control unit for regulating an opening degree of the first regulating valve and an opening degree of the second regulating valve in accordance with the first inlet pressure and the second inlet pressure.