Gas Turbine Blocking Device for Rapid Startup Thermal Management
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Solution Overview
Problem
Gas turbines in thermal power plants face challenges in quickly transitioning from a deactivated state to load operation without risking component failure due to excessive cooling and stress on components during the startup process.
Innovation Solution
A blocking device is implemented to partially close off the inlet and exhaust sections of the gas turbine, preventing convection cooling and allowing the components to maintain warmth, which reduces the time needed for heating up and minimizes stress on components during startup, while also converting mechanical turning energy into heat energy to preheat the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the gas turbine is run up quickly from deactivated state to load operation, then the productivity is improved, but the reliability deteriorates due to excessive cooling and stress on components
Solution Approach 1:
The blocking device is activated before the startup sequence to prevent convection cooling of components. This preliminary action maintains component temperature at an elevated level, reducing the thermal shock and stress that would occur during rapid startup, thereby enabling faster startup without compromising component reliability
Solution Approach 2:
The invention converts the harmful effect of convection cooling into a beneficial effect by using the blocking device to trap heat within the turbine system. The heat that would normally be lost through convection is retained, pre-heating components for the upcoming startup sequence and reducing the thermal stress during rapid acceleration
2Temperature
If the blocking device closes off the inlet and exhaust sections, then the convection cooling is prevented and components remain warm, but the device complexity increases
Solution Approach 1:
The blocking device serves multiple functions: it prevents convection cooling during shutdown, maintains component temperature during the no-load phase, and can be configured to allow controlled cooling when needed. This multi-functionality justifies the added structural complexity by providing versatile thermal management capabilities
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 solution enables the gas turbine to be quickly restarted after a shutdown, reduces the risk of component failure, and allows for a higher load gradient by maintaining components at a stable temperature, thus enhancing the starting behavior and reducing unwanted cooling of downstream components.
Implementation Method 1
preventing convection cooling and allowing the components to maintain warmth
Implementation Method 2
converting mechanical turning energy into heat energy to preheat the system
Data Source
AI summary
Disclosed is a gas turbine for a thermal power plant, especially a gas turbine, comprising a rotatable rotor and a duct which can be penetrated by a gas and in which turbine blades for driving the rotor are disposed. The inventive gas turbine is characterized by a blocking device which at least partially prevents the gas from penetrating the duct in a closed position.