Coriolis Flow Meter Sensor Arrangement for Immiscible Media
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Solution Overview
Problem
Coriolis measuring devices face difficulties in accurately measuring mass flow and density when dealing with media containing immiscible components, such as liquid, gaseous, and solid components, especially when these components are present in low concentrations and not homogeneously distributed, leading to challenges in flow and density measurements.
Innovation Solution
The method involves using at least two sensors to detect vibration properties of a measuring tube, with a third sensor optionally used to account for local concentration fluctuations, allowing for the calculation of the speed of the second component based on time offsets between detected vibration profiles, and using signal processing techniques like cross-correlation to infer the presence of immiscible components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional Coriolis measurement methods are used for media with immiscible components, then the measurement device structure remains simple, but measurement precision deteriorates due to non-homogeneous distribution of components
Solution Approach 1:
The measurement device segments the monitoring function by placing multiple sensors at different positions along the measuring tube. Each sensor detects vibration properties at its specific location, and the evaluation unit processes these segmented measurements to account for local concentration fluctuations of immiscible components, thereby improving overall measurement precision without requiring complete system redesign
Solution Approach 2:
The invention applies local quality by detecting vibration properties at specific locations along the measuring tube where immiscible components are present. The sensors are strategically positioned to capture local concentration fluctuations, and the evaluation unit uses this localized information to correct mass flow measurements, addressing the specific problem areas rather than treating the entire measurement system uniformly
2Measurement precision
If multiple sensors are added to detect local concentration fluctuations, then measurement precision improves, but device complexity increases
Solution Approach 1:
The sensors in the measurement device serve multiple functions: they detect the Coriolis vibrations necessary for mass flow measurement, simultaneously capture local concentration fluctuations of immiscible components, and provide data for both primary mass flow calculation and secondary plausibility checks. This multi-functionality reduces the need for separate dedicated sensors for each measurement type
Solution Approach 2:
The evaluation unit uses the detected local concentration fluctuations as feedback to correct and validate the mass flow measurements. By continuously monitoring vibration properties at multiple positions and comparing them against expected patterns, the system can identify and compensate for measurement errors caused by non-homogeneous component distribution, improving precision through iterative validation
3Adaptability or versatility
If the measuring tube is used to measure mass flow of complex media, then the device can handle various media types, but measurement reliability deteriorates when components are not homogeneously distributed
Solution Approach 1:
The evaluation unit dynamically adjusts the measurement and validation process based on real-time detection of concentration fluctuations. When non-homogeneous distribution is detected through vibration property variations, the system dynamically applies correction factors and plausibility checks, adapting the measurement approach to the specific media conditions rather than relying on fixed measurement parameters
Solution Approach 2:
The invention replaces direct mechanical analysis of the medium composition with vibration-based detection. Instead of mechanically separating or chemically analyzing the immiscible components, the system uses vibration property changes detected by sensors as a proxy indicator of concentration fluctuations, substituting a simpler vibration measurement system for more complex direct composition analysis
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 enables precise measurement of mass flow rates by accounting for local concentration fluctuations, improving the accuracy of flow rate measurements even in media with non-homogeneous components, and allows for a plausibility check of the mass flow rate using the Coriolis effect.
Implementation Method 1
at least one exciter which is set up to excite the measuring tube to oscillate
Implementation Method 2
at least two sensors which are set up to detect the vibrations of the measuring tube
Implementation Method 3
Coriolis measuring devices are suitable for measuring the mass flow and the density of a medium flowing through at least one measuring tube
Data Source
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AI summary
The invention relates to a method (100) for operating a Coriolis measuring device (1) for measuring a mass flow or flow velocity of a medium flowing through at least one measuring tube and having at least two non-miscible components, wherein at least two sensors (11) detect measuring tube oscillations excited by at least one exciter (12), wherein the sensors are arranged to follow one another in the direction of a measuring tube centre line (10.3), wherein a first sensor (11.1) detects at least one inlet-side oscillation property (SE1) of the measuring tube oscillation, and wherein a second sensor (11.2) detects at least one second outlet-side oscillation property (SE2) of the measuring tube oscillation, wherein the local concentration fluctuation or frequency fluctuation of at least one further, second component influences the measuring tube oscillation in the region of the local concentration fluctuation or frequency fluctuation, wherein, in a first method step (101), an onward movement of the local concentration fluctuation or frequency fluctuation is detected, by means of the at least two sensors, wherein, in a second method step (102), a velocity of the at least one set component is calculated on the basis of the detected onward movement of the local concentration fluctuation or frequency fluctuation.