Flow Measuring Point Combining Coriolis and Pressure-Difference Sensors
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Solution Overview
Problem
Coriolis measuring devices face decreased measurement accuracy at low flow rates or with gas bubbles in the medium, leading to uncertainties in flow measurement, especially in applications with fluctuating medium compositions.
Innovation Solution
A method that combines a Coriolis measuring device with a pressure-difference measuring apparatus to detect pressure drops and correct mass flow rate measurements by determining viscosity and Reynolds numbers, accounting for gas bubbles and fluctuating states, using iterative calculations and physical-mathematical models to improve measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure difference measurement is used for flow measurement, then measurement accuracy is improved under certain conditions, but measurement reliability deteriorates when medium composition fluctuates
Solution Approach 1:
The patent combines a Coriolis measuring device and a pressure-difference measuring apparatus into a unified flow measuring point system. The Coriolis device measures mass flow rate and density, while the pressure-difference apparatus measures pressure drop. By merging these two measurement systems and integrating their data through a control unit, the patent achieves both improved measurement precision under certain conditions and maintained measurement reliability when medium composition fluctuates, directly resolving the technical contradiction.
2Measurement precision
If Coriolis measuring device is used, then mass flow rate and density can be measured, but measurement accuracy deteriorates at very low flow rates or with gas bubbles
Solution Approach 1:
The patent introduces pressure difference measurement as an intermediary measurement method. When the Coriolis measuring device encounters difficult conditions (very low flow rates or gas bubbles), the pressure-difference measuring apparatus serves as an alternative measurement path. The control unit selects appropriate measured values from either the Coriolis device or the pressure-difference apparatus based on the current medium state, ensuring reliable flow measurement across all operating conditions.
3Productivity
If pressure difference measurement is used, then flow measurement can be performed, but disruptive uncertainties occur when medium composition fluctuates
Solution Approach 1:
The patent implements a feedback mechanism where the control unit continuously monitors the media state using measured values from both the Coriolis measuring device and the pressure-difference measuring apparatus. Based on this feedback information about medium composition and flow conditions, the control unit dynamically selects or combines measured values to determine the final flow rate, thereby maintaining measurement precision even when medium composition fluctuates while preserving flow measurement capability.
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 method enables accurate mass flow rate measurements even under difficult conditions by correcting for gas bubbles and fluctuating medium states, enhancing measurement precision and reliability.
Implementation Method 1
a Coriolis measuring device (10) for measuring a mass flow rate and a density of a medium flowing through a pipeline, wherein the Coriolis measuring device has at least one measurement tube (11)
Implementation Method 2
a pressure-difference measuring apparatus (20) is configured to detect a pressure difference between a flow region (3.1) arranged upstream of a flow obstruction, especially the Coriolis measuring device (10), and a flow region (3.2) arranged downstream of the flow obstruction
Data Source
AI summary
The present disclosure relates to a method for operating a flow measuring point for media having at least one liquid phase, the flow measuring point including: a Coriolis measuring device for measuring the mass flow rate and the density of a medium flowing through a pipeline; and a pressure-difference measuring apparatus for sensing the pressure difference between a flow region arranged upstream of the Coriolis measuring device and a flow region arranged downstream of the Coriolis measuring device, wherein a flow measurement based on measured values of the pressure difference is corrected by means of measured values acquired using the Coriolis measuring device.