Gas Turbine Bearing Torque Detection Before Rotor Startup
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Solution Overview
Problem
The technical problem lies in the need for an effective method to detect faults in air bearings or mixed bearings during the starting stage of a gas turbine, ensuring the bearing can support the rotor successfully and preventing damage from excessive friction.
Innovation Solution
A bearing detection method that involves starting the rotor, acquiring torque values at different rotating speeds, and comparing these values to threshold values to determine if the bearing is fault-free or not.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the rotor is dragged to accelerate in a forced manner during starting, then the rotor can be started, but severe consequences occur including rotor damage or damage to other parts due to excessive friction force
Solution Approach 1:
The patent applies preliminary action by detecting bearing health status before the gas turbine starting process. The detection method measures vibration signals at the bearing outer race in the starting stage to identify potential bearing faults or rotor bending deflection before they can cause excessive friction and damage during forced acceleration.
Solution Approach 2:
The patent implements preliminary anti-action by preventing forced acceleration when bearing faults are detected. The control system inhibits the starting process if abnormal vibration signals indicate bearing damage or rotor bending, thereby avoiding the harmful friction forces that would occur during forced acceleration of a faulty rotor-bearing system.
2Reliability
If the air bearing is damaged or the rotor shaft is subjected to bending deflection, then the pressure air film cannot be formed to support the rotor, but a condition that the rotor may not be accelerated occurs due to too large friction force
Solution Approach 1:
The patent detects bearing support capability in advance during the starting stage by monitoring vibration signals at the bearing outer race. This preliminary detection identifies whether the air bearing can properly support the rotor before full acceleration begins, preventing subsequent acceleration problems.
Solution Approach 2:
The patent uses feedback by continuously monitoring vibration signals from the bearing during the starting stage and using this information to control whether the gas turbine should proceed with acceleration. The detection system provides real-time feedback on bearing health to the control system, enabling informed decisions about rotor acceleration.
3Reliability
If a detection method is implemented to detect bearing faults during starting stage, then bearing support capability can be ensured, but additional detection mechanisms and system complexity are required
Solution Approach 1:
The patent applies self-service by using the gas turbine's existing vibration monitoring infrastructure to detect bearing faults. The detection method utilizes vibration signals that are already present in the system and can be measured with existing sensors, eliminating the need for separate dedicated detection mechanisms.
Solution Approach 2:
The patent implements universality by using a multi-functional detection approach that can identify multiple fault types (bearing damage, rotor bending deflection) using the same vibration measurement system. The single detection method serves multiple diagnostic purposes without requiring separate specialized sensors or systems for each fault type.
Data Source
AI summary
Provided are a bearing detection method, a bearing detection system, a method for starting a gas turbine and a system for starting a gas turbine. The bearing detection method includes: starting a rotor to enable the rotor to rotate at a first rotating speed along a first direction, wherein the first direction is a rotating direction when the rotor operates normally, and the first rotating speed is a calibration value; acquiring a first torque, wherein the first torque is an output torque when the rotor rotates at the first rotating speed along the first direction; and judging the first torque and a torque threshold value, wherein the torque threshold value is a calibration value, and if the first torque is smaller than the torque threshold value, it is judged that a bearing is fault-free.