Conductive sensor for phase seperation containing rate in two-phase stream and structure parameter optimizing method thereof

Abstract

The invention provides a two-phase flow split rate conductive sensor. The sensor consists of a conducting ring layer, and an exciting electrode couple and a measuring electrode couple which are attached to the conducting ring layer, wherein exciting electrodes and measuring electrodes are symmetrically and spirally distributed according to an angle of 180 degrees in the radial direction of a tube wall of the conducting ring layer. At the same time, the invention also provides a structural parameter optimizing method based on the structure of the sensor. The method has the advantages of aiming at real-time measurement of two-phase flow rate, overcoming the defect of floating of a measured electrode caused by contact of a measured electrode and a non-conductive substance in the prior conductive sensor, providing a conductive electrical sensor, providing an expression of sensitivity distribution of any point on a two-dimensional sensor cross section based on an analytic model of the conductive electrical sensor, and quickly optimizing a structural parameter. The method belongs to non-intrusive quick measurement, widens measurement range, and has low cost.

Description

technical field [0001] The invention relates to a detection device, in particular to a two-phase flow split-phase holdup conductivity sensor and a structural parameter optimization method thereof. Background technique [0002] Phase holdup is an important parameter for online real-time measurement of two-phase flow, which is of great significance in industrial production and oil transportation. Because the electrical method has the advantages of non-invasive measurement, fast response, safety and reliability, low cost, easy installation, and durability, it is suitable for industrial online applications. When the fluid composition in the pipeline changes, the corresponding electrical parameters change. Through a set of electrode arrays arranged on the inner or outer wall of the pipeline, the change of the electrical signal caused by the change of the fluid composition is measured. According to the electrical measurement between the measuring plates value, the phase concentra...

AI Technical Summary

Problems solved by technology

However, the two-phase flow process is very complicated, the solid phase distribution in the sensor is uneven, and the flow pattern changes rapidly; at the same time, because the detection field of the electrical sensor is a "soft field", its sensitivity distribution changes with the phase distribution, and its inherent sensitivity distribution Inhomogeneity will lead to measurement results not only related to phase concentration, but also its measurement accuracy is affected by phase distribution and flow pattern changes

[0003] At present, the electrode array of the two-phase flow separation phase holdup conductivity sensor designed for industrial applications is generally in contact with the measured substance. The electrodes are floating, which can easily lead to saturation of the resistance / conductance measurement circuit, limiting its measurement range and accuracy

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