Single-Casing Turbine Generator Rotor Inertia for Overspeed Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Turbine power generation systems with a single casing configuration face challenges in inhibiting over-rotation speeds during load rejection, leading to potential damage due to lower moment of inertia and difficulty in achieving high power generation capacities like 150 MW, necessitating a multiple casing configuration.
Innovation Solution
The system is designed with a single turbine casing and a power generator rotor with a larger moment of inertia than the turbine rotor, where the power generator rotor's outside diameter is increased to enhance the turbine rotor's moment of inertia, thereby preventing over-rotation speeds while maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a multiple casing configuration is used to increase power generation capacity, then the power generation output increases, but the overall length in the axial direction becomes longer and installation area increases
Solution Approach 1:
The patent merges multiple turbine stages into a single casing configuration, combining high-pressure and low-pressure turbine parts within one casing rather than using separate casings. This integration maintains the power generation capacity of multiple casings while reducing the overall axial length and simplifying the structure.
2Length of stationary object
If a single casing configuration is used to reduce installation area, then the overall length in the axial direction becomes shorter, but it becomes difficult to inhibit the turbine rotor from reaching over-rotation speed during load rejection
Solution Approach 1:
The patent applies the counterweight principle by increasing the moment of inertia of the power generator rotor relative to the turbine rotor. This creates an inertial balance that prevents the turbine rotor from reaching dangerous over-rotation speeds during load rejection, effectively using the power generator rotor's inertia to counteract the turbine rotor's overspeed tendency.
3Ease of repair
If a single casing configuration is used to simplify maintenance, then the number of parts is reduced, but the power generation capacity cannot reach 150 MW or more
Solution Approach 1:
The patent combines multiple turbine stages (high-pressure and low-pressure turbine parts) within a single casing, enabling the system to achieve high power generation capacity of 150 MW or more while maintaining the simplicity of a single-casing structure that facilitates easier maintenance compared to multiple casings.
4Reliability
If the power generator rotor's moment of inertia is increased to prevent over-rotation, then the over-rotation speed is inhibited, but the device complexity increases
Solution Approach 1:
The patent changes the physical parameter of the power generator rotor by increasing its moment of inertia through design modifications. This parameter change enables over-rotation prevention without requiring complex control systems or additional safety devices, thereby avoiding increased device complexity while maintaining reliability.
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
This configuration effectively inhibits over-rotation speeds and achieves a power generation capacity of 150 MW or more in a single casing system, balancing performance and safety by increasing the power generator rotor's moment of inertia relative to the turbine rotor.
Implementation Method 1
a moment of inertia of the power generator rotor is larger than a moment of inertia of the turbine rotor
Data Source
AI summary
There is provided a turbine power generation system with a single casing configuration capable of easily executing the inhibition of an over-rotation speed. A turbine power generation system in an embodiment includes: a turbine including a turbine casing and a turbine rotor that rotates by a working medium to be introduced into the turbine casing; and a power generator including a power generator rotor connected to the turbine rotor, the power generator being caused to generate power by rotation of the power generator rotor caused by the rotation of the turbine rotor. The turbine casing of the turbine is single, and a moment of inertia of the power generator rotor is larger than a moment of inertia of the turbine rotor.