Coriolis Flow Meter Multiphase Detection
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Solution Overview
Problem
Coriolis mass flow rate measurement devices struggle to reliably detect multiphase flows, especially two-phase flows, due to reliance on single indicator quantities that can be influenced by medium properties and installation conditions, leading to potential false detection.
Innovation Solution
The use of multiple independent indicator quantities, such as friction losses, inhomogeneity, nominal behavior modeling, and transit time effects, to confirm the presence of a multiphase flow, ensuring that changes indicative of a multiphase flow are verified across multiple parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single indicator quantity (e.g., drive power or installation factor) is used for multiphase flow detection, then the detection method is simple, but the reliability of detection deteriorates due to false positives from medium property changes or installation conditions
Solution Approach 1:
The detection method is segmented into multiple independent indicator quantities (first indicator quantity and second indicator quantity), each based on different physical principles or measurement parameters. This segmentation allows the system to distinguish between true multiphase flow conditions and false indicators caused by medium property changes or installation conditions, thereby improving detection reliability while maintaining operational simplicity through systematic evaluation of multiple parameters.
2Reliability
If multiple independent indicator quantities are used for multiphase flow detection, then the reliability of detection is improved, but the device complexity increases
Solution Approach 1:
The Coriolis mass flow rate measurement device is enhanced with multi-functionality by incorporating multiple independent indicator quantities for multiphase flow detection alongside its primary mass flow measurement function. These indicator quantities utilize existing measurement capabilities (such as vibration amplitude, drive power, frequency responses) in different combinations and interpretations, allowing the same device to perform both mass flow measurement and reliable multiphase flow detection without requiring entirely separate detection systems.
3Ease of operation
If drive power is used as the sole indicator for multiphase flow detection, then the method is straightforward, but measurement precision deteriorates due to influence from viscosity changes and installation conditions
Solution Approach 1:
The system introduces intermediate indicator quantities that mediate between the raw drive power measurements and the final multiphase flow detection decision. These intermediate indicators include normalized vibration amplitudes, phase angle differences, frequency response ratios, and other derived parameters that compensate for the influences of medium viscosity and installation conditions. By using these intermediary quantities, the system maintains operational simplicity while achieving precise multiphase flow detection through multi-parameter evaluation.
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 reduces the risk of erroneous detection by requiring concurrent changes in multiple independent indicator quantities, providing a more reliable method for identifying multiphase flows without prior knowledge of medium properties.
Implementation Method 1
the measurement tube through which a medium flows with a mass flow rate which is to be determined is subjected to vibration excitation; this leads to resulting vibrations of the measurement tube
Implementation Method 2
the density of the medium changes the resonant frequency of the vibration system, while the mass flow rate of the medium changes the form of the vibration
Implementation Method 3
Coriolis mass flow rate measurement devices generally have a single measurement tube or a plurality of measurement tubes through which a medium flows
Data Source
AI summary
A process for operating a Coriolis mass flow rate measurement device, with at least one measurement tube (10) through which a medium flows and which is subjected to vibration excitation that leads to resulting vibrations of the measurement tube (10), a first indicator quantity being used for detection of a multiphase flow. For detection of the multiphase flow, an additional, second indicator quantity that is independent of the first indicator quantity is used. Thus, a process for operating a Coriolis mass flow rate measurement device (1) is attained with which the detection of multiphase flows, especially of two-phase flows, is reliably possible without the need to make assumptions regarding the properties of the individual phases of the flowing medium.