Piecewise Gas Volume Fraction Fitting for Venturi Wet Gas Metering
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Solution Overview
Problem
Existing wet gas flow meters rely on gamma radiation, posing safety concerns and limiting their application due to regulatory issues, necessitating a non-ray technology for accurate and safe metering of wet natural gas.
Innovation Solution
A metering method based on gas volume fraction fitting using a Venturi flow meter, which involves fitting relationships between gas Froude number, Venturi pressure loss, and differential pressure to calculate gas volume fraction and flow rate, eliminating the need for gamma radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gamma radiation sources are used for wet gas flow metering, then measurement capability is improved, but safety and regulatory compliance deteriorate
Solution Approach 1:
The patent replaces the gamma radiation-based measurement system with a mechanical Venturi flow meter system that uses differential pressure measurement and gas volume fraction fitting. The Venturi tube creates pressure differences that are measured by standard pressure sensors, and the gas volume fraction is determined through fitting algorithms based on pressure loss and differential pressure data, eliminating all radioactive components while maintaining metering capability
Solution Approach 2:
The patent introduces an intermediary computational model that relates differential pressure, pressure loss, and gas volume fraction through fitting relationships. This intermediary mathematical model acts as a bridge between the mechanical pressure measurements and the final flow rate calculation, enabling accurate wet gas metering without direct radiation measurement
2Adaptability or versatility
If Venturi flow meter technology is used, then safety and applicability are improved, but measurement precision deteriorates due to lack of gamma ray integration
Solution Approach 1:
The patent changes the measurement parameters from direct gamma radiation detection to differential pressure and pressure loss measurements. By fitting relationships between these parameters and gas volume fraction, the system achieves accurate wet gas metering using conventional pressure measurement technology that can be applied in areas where gamma radiation is restricted
Solution Approach 2:
The patent implements a feedback mechanism through iterative fitting of gas volume fraction based on measured differential pressure and pressure loss data. The system continuously adjusts the gas volume fraction calculation to match the observed pressure characteristics, improving measurement precision through adaptive optimization rather than relying on gamma ray signals
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
Accurate metering with minimal errors and no radioactive pollution, enabling practical application in areas where gamma radiation is restricted.
Implementation Method 1
The basic principle of the Venturi metering technology is shown in FIG. 1. Venturi differential pressure DP1 is measured by taking pressure (2 and 3) at the upstream portion and the throat of a Venturi tube respectively, Venturi pressure loss PL is measured by taking pressure at the upstream portion and downstream portion of the Venturi tube respectively.
Data Source
AI summary
A metering method based on gas volume fraction fitting for wet natural gas is provided. The method includes fitting relationships between a gas Froude number and Venturi differential pressure and Venturi pressure loss with known data to obtain a gas Froude number calculation formula; dividing the known data according to a size of the gas Froude number; fitting relationships between a gas volume fraction and the Venturi differential pressure and the Venturi pressure loss in sections to obtain a piecewise gas volume fraction calculation formula under different gas Froude numbers; and acquiring, on the basis of the gas Froude number calculation formula and the piecewise gas volume fraction calculation formula, some necessary real-time data to calculate a real-time flow rate of the wet gas. The method avoids the use of a ray flow meter. The advantages of the method include accurate metering, small errors and no radioactive pollution.