Thermowell Vibration Detection Using Resonant Sensor
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Solution Overview
Problem
Thermowells in industrial process monitoring systems are prone to damage due to vibration-induced resonance, which can lead to leakage and sensor failure, as existing designs struggle to adapt to changes in process conditions that shift wake and resonance frequencies.
Innovation Solution
A sensor system comprising a process transducer and an unpowered vibration sensor with a natural resonant frequency matching the thermowell's resonance frequency, allowing for real-time detection of potentially damaging resonance conditions through a vibration-to-voltage transducer that produces a signal indicating proximity to resonance, enabling early fault detection and prevention of thermowell failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermowells are designed using predicted wake frequencies to avoid resonance conditions, then thermowell reliability is improved, but changes in process conditions during operation can cause shifts in wake and resonance frequencies that increase the likelihood of resonance conditions
Solution Approach 1:
The system continuously monitors vibration levels of the thermowell and compares them against predetermined thresholds. When vibration indicates proximity to resonance conditions, the system provides feedback by generating an alarm signal that can trigger process adjustments or shutdown procedures, allowing the system to adapt to changing conditions in real-time
Solution Approach 2:
The patent replaces traditional mechanical resonance avoidance design with an electronic monitoring and detection system using vibration sensors and signal processing electronics to detect and respond to resonance conditions dynamically during operation
2Measurement precision
If vibration sensors are added to detect resonance conditions, then early fault detection capability is improved, but device complexity increases due to additional sensors and signal processing requirements
Solution Approach 1:
The vibration sensor system is designed to perform multiple functions: it monitors thermowell vibration levels, detects resonance conditions, provides early warning alarms, and can trigger protective actions. This multi-functionality justifies the added complexity by consolidating several protective and monitoring capabilities into one integrated system
Solution Approach 2:
The monitoring system is designed to be self-diagnostic and self-activating, automatically detecting resonance conditions and triggering alarms or protective shutdowns without requiring external intervention or complex manual monitoring procedures
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
The system effectively detects and alerts on harmful resonance conditions before thermowell failure, extending its lifespan and preventing downstream equipment damage by matching the resonant frequencies of the thermowell and vibration sensor, thus ensuring sustained operation and safety.
Implementation Method 1
The vibration sensor has a natural resonant frequency closely matching a resonant frequency of the thermowell
Implementation Method 2
an unpowered vibration sensor configured to produce a second sensor signal reflecting vibration of the thermowell
Data Source
Figure 1
Figure 2~3
AI summary
A sensor system comprises a process transducer, a unpowered vibration sensor, and a process transmitter. The process transducer is disposed within a thermowell and configured to produce a first sensor signal. The unpowered vibration sensor is configured to produce a second sensor signal reflecting vibration of the thermowell. The process transmitter is configured to receive, process, and transmit the first and second sensor signals.