Twin-array-type capacitive transducer and gas solid two-phase flow detection method thereof

Abstract

The invention discloses a twin-array-type capacitive transducer and a gas solid two-phase flow detection method thereof, which belong to the field of multiphase flow detection. According to the dual-array-type capacitive transducer and the gas solid two-phase flow detection method thereof, the internal local concentration of the transducer is obtained through measuring the capacitance between of adjacent electrode plates by utilizing the characteristic that the adjacent electrode plates of the twin-array-type capacitive transducer have nonuniform sensitivity, so that the phase concentration distribution of two pipeline internal sections is rebuilt. Based on the characteristic that the random change of local concentration of the dispersed phase in a fluid causes the random change of the capacitance between the electrode plates, the pipeline internal velocity field distribution is rapidly rebuilt by using a cross correlation method so that noncontact monitoring and study are carried out on the disciplinarian of the stability, a flow pattern and the like of a gas solid flow according to the concentration distribution and the velocity distribution. The method provided by the invention is used as an extension of an electrical capacitance tomography (ECT) and has few measurement data, no complex operations and rapid detection velocity; the nonlinear error caused by rebuilding an ECT image is avoided, and accurate and reliable detection is realized; and a powerful means for the flow characteristic study of the gas solid two-phase flow is provided.

Description

technical field [0001] The invention relates to a capacitance sensor and a method for detecting gas-solid two-phase flow in a sensor pipeline by using the capacitance sensor, which belongs to the technical field of multiphase flow detection and is used for realizing the diagnosis and flow characteristic test of the gas-solid two-phase flow process. Background technique [0002] There are many methods for detecting gas-solid two-phase flow, such as tomography, high-speed camera, electrostatic method and so on. Among them, the high-speed camera method can accurately and intuitively obtain the dynamic flow of the fluid, but it can only be applied to the dilute phase flow due to the restriction of the fluid transparency, and the application range is limited; the electrostatic method uses the static electricity induced during the flow of solid particles to obtain the fluid flow. Flow parameters have the advantages of fast detection speed and simple structure, but when detecting t...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is aimed at the defects and deficiencies of the above-mentioned prior art. In the detection of gas-solid two-phase flow, it solves the problem that the capacitance tomography technology has low precision in extracting the velocity field of the pipeline section and cannot meet the real-time measurement requirements. defects, and simplify the measurement system and reduce the amount of calculation

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