A gas-liquid two-phase flow phase holdup and phase separation flow detection device and detection method

Abstract

The invention provides a gas-liquid two-phase flow phase holdup and a separate phase flow rate detection device and detection method. The device comprises an outer tube, an inner tube, a differential pressure transmitter, an LCR tester, a data collection unit and a data processing unit. The inner tube is connected in the outer tube in a sleeved mode, the middle of the inner tube is a baffle area, the two ends of the inner tube are circulation areas, fluid outlet holes and fluid inlet holes are formed in the side walls of the circulation areas at the two ends of the inner tube respectively, a to-be-tested fluid enters the inner tube from one circulation area of the inner tube, enters an annular space between the inner tube and the outer tube through the fluid outlet holes and then flows to the other circulation area through the fluid inlet holes, and the phase holdup of two-phase flow can be obtained by measuring a capacitance value of an annular capacitor and combing correlation operation; by combining pressure differences of the fluid at the two ends of the inner tube, the fluid total flow can be obtained, and the separate phase flow rate can be obtained finally. According to the gas-liquid two-phase flow phase holdup and the separate phase flow rate detection device and detection method, the inner tube and the outer tube and a middle fluid forms capacitance, the capacitance value is only related to an intermediate medium, and therefore an influence of flow pattern changes to measurement of the two-phase flow holdup can be weakened.

Description

technical field [0001] The invention relates to a two-phase flow flow detection device, in particular to a gas-liquid two-phase flow phase holdup and phase separation flow detection device and detection method. Background technique [0002] At present, the continuous online detection methods of phase holdup mainly include optical methods (laser, optical fiber), electrical methods, ray methods, nuclear magnetic resonance methods, microwave methods, etc. [0003] The optical method is further divided into two methods: the optical fiber probe method and the light intensity modulation method. The optical fiber probe method mainly utilizes that different media have different refractive indices for light. When the measurement medium passes through the optical fiber probe, the photoelectric converter outputs a signal to obtain the gas fraction information of the local cross-section. The light intensity modulation method is to detect the phase holdup in the pipeline according to th...

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Problems solved by technology

Although various methods have some applications in some specific occasions, generally speaking, due to the complexity of two-phase flow flow and the diversity of two-phase flow conditions, especially the change of two-phase flow flow patterns, the measurement of related parameters There is a non-negligible impact, which will eventually affect the measurement of phase holdup. Therefore, the problems of phase holdup and flow measurement of two-phase flow have not been well resolved.

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