Method and device for measuring two-phase flow parameter based on double-end capacitance probe

Abstract

The invention provides a two-phase flow parameter measurement method based on a dual-head capacitance probe and a device thereof, belonging to the field of multi-phase flow testing technology. The device comprises the dual-head capacitance probe, a probe driving mechanism, two capacitance measurement circuits, a fixed capacitor, a slab electrode and a computer system; wherein, the dual-head capacitance probe system consists of two independent single-point capacitance probes and can carry out one-dimensional motion on the section of a pipeline. The method comprises the steps as follows: each single-point capacitance probe is used for recognizing fluid property; when the fluid passing through the head of the probe is conducted, the circuit is connected and the capacitance measurement deviceoutputs high level, otherwise the circuit is cut off and the capacitance measurement device outputs low level. The level signal can obtain local phase holdup; the measurement result of the method is not affected by the conductivity of the fluid and the spacing of the probes. The local phase holdup and the flowing speed can be obtained by processing the two single-point capacitance probe signals by the threshold method and the correlation method; the flowing pattern information can be obtained by combining with two-phase flow knowledge, thus achieving the recognition of flow pattern on line.

Description

technical field [0001] The invention relates to a method and a device in the technical field of multiphase flow testing, in particular to a method and a device for measuring two-phase flow parameters based on a double-head capacitance probe. Background technique [0002] Two-phase flow widely exists in nuclear energy, petroleum, chemical industry, aviation and other engineering fields. The monitoring of the two-phase flow process plays a vital role in the safety and economy of the industrial process, and the parameters of the two-phase flow process are essential for establishing mathematical models and analyzing the flow mechanism. The detection of two-phase flow parameters is of great significance to the development of two-phase flow theory and engineering application. According to the different properties of the two-phase fluid, many parameter measurement methods have been proposed: ray method, optical method, electrical method, thermal method and so on. [0003] Due to ...

AI Technical Summary

Problems solved by technology

In the laboratory or actual industrial field, the conductivity of the fluid in the multiphase flow often changes constantly, so the current conductivity measurement methods cannot accurately obtain the parameters, and it is necessary to find a parameter measurement method that is not subject to conductivity changes

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