Coriolis Flow Meter Phase Tracking for Multiphase Stability
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Solution Overview
Problem
Coriolis mass flow rate measurement devices experience loss of operating point and measurement disruptions during multiphase flows, requiring frequent restarts due to changes in resonant frequency and phase ratios, leading to measurement inaccuracies and operational inefficiencies.
Innovation Solution
The process involves detecting the rate of change of the response phase and adjusting the excitation frequency using a predetermined function, maintaining a stable phase shift, and using independent A/D conversions with adjustable dead times to maintain continuous measurement operations, even during multiphase flows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measurement tube is excited at the resonant frequency, then the measurement precision is improved, but the operating point is lost when multiphase flows occur due to resonant frequency changes
Solution Approach 1:
The excitation frequency is dynamically adjusted based on the detected rate of change of the response phase. When multiphase flows cause resonant frequency shifts, the system automatically tracks these changes by modifying the excitation frequency in real-time, preventing loss of the operating point while maintaining measurement precision.
Solution Approach 2:
The system uses feedback from the response phase detection to adjust the excitation frequency. By continuously monitoring the rate of change of the response phase and using this information to modify the excitation frequency, the system maintains optimal operating conditions even when multiphase flows occur.
2Adaptability or versatility
If the excitation frequency is readjusted when multiphase flows occur, then the resonant frequency tracking is improved, but the measurement operation is interrupted during restart phase
Solution Approach 1:
The system performs preliminary detection of the rate of change of the response phase before complete frequency realignment is needed. This early detection allows the excitation frequency to be adjusted in a controlled manner, minimizing the interruption time and avoiding complete restart of the measurement operation.
Solution Approach 2:
The excitation frequency is changed by a predetermined amount based on the detected rate of change of the response phase. This parameter adjustment allows the system to adapt to resonant frequency shifts without requiring complete restart, thereby reducing measurement interruption time while maintaining adaptability.
3Stability of the object's composition
If the phase shift is maintained at a predetermined value, then the operating point stability is improved, but the response to rapid resonant frequency changes is slowed
Solution Approach 1:
The system dynamically adjusts the phase shift maintenance strategy based on the detected rate of change of the response phase. When changes are rapid, the system allows larger phase deviations temporarily to track the resonant frequency shift. When changes are slow, the system maintains the predetermined phase shift value to ensure operating point stability.
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 approach allows for continuous mass flow rate measurement without losing the operating point, reducing measurement errors and operational disruptions, and improving the efficiency and reliability of Coriolis mass flow rate measurement devices in multiphase flow conditions.
Implementation Method 1
the measurement tube being excited into vibrations with a predetermined excitation frequency and a predetermined excitation phase
Implementation Method 2
the density of the medium changes the resonant frequency of the vibration system
Implementation Method 3
the mass rate of flow of the medium changes the vibration form
Data Source
AI summary
A process for operating a Coriolis mass flow rate measurement device which has at least one measurement tube, the measurement tube being excited into vibrations with a predetermined excitation frequency and a predetermined excitation phase. The response phase which is achieved thereby and the rate of change of the response phase are detected and the excitation frequency is changed by the frequency amount which arises based on a predetermined function from the detected rate of change of the response phase. This makes it possible to maintain continuous measurement of the mass rate of flow even if two-phase flows occur.