Apparatus and method for measuring sectional phase volume fraction of gas-liquid two-phase flow in pipeline

Abstract

The invention provides an apparatus and a method for measuring the sectional phase volume fraction of gas-liquid two-phase flow in a pipeline. The apparatus comprises a near infrared emitting device, a near infrared receiving device, a data acquisition unit and a computer. Near-infrared light emitted by the near infrared emitting device is invisible light which is barely influenced by an external environment, has good monochromaticity and stability, can realize remote accurate tracking of a hot target and has the advantages of strong detection capability and a great action distance, so the near-infrared light can be used for measuring the sectional phase volume fraction of gas-liquid two-phase flow in the case of a severe environment (e.g., in a black lightproof fluid medium produced from an oil well). The near infrared emitting device and the near infrared receiving device are installed on the outer wall of a pipeline and pose no influence on the flow characteristics of the gas-liquid two-phase flow in the pipeline, so real-time on-line measurement can be realized without separation of the gas-liquid two-phase flow. The apparatus needs short response time, can carry out high frequency measurement and accurately determine the sectional phase volume fraction of gas-liquid two-phase flow in a pipeline and is simple and convenient to operate.

Description

technical field [0001] The invention relates to a method for measuring phase holdup of multiphase flow, in particular to a device and method for measuring cross-sectional phase holdup of gas-liquid two-phase flow in a pipeline. Background technique [0002] Gas-liquid two-phase flow (the abbreviation of "gas-liquid two-phase fluid") widely exists in many industrial processes such as petroleum, chemical industry, energy, and power. "Phase holdup" is one of the important parameters to characterize the characteristics of gas-liquid two-phase flow. Its online measurement plays an important role in the state monitoring, real-time control, safe operation, energy saving and efficiency enhancement of the two-phase flow system. [0003] The current methods for measuring phase holdup include: fast opening and closing valve method, ray absorption / scattering method, optical method based on visible light, thermal method, electrical method and microwave method, etc. The rapid opening and...

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Problems solved by technology

[0005] One of the purposes of the present invention is to provide a device for measuring the cross-sectional phase holdup of gas-liquid two-phase flow in the pipeline, so as to solve the problem that existing devices cannot real-time, online, and dynamically measure the phase holdup of gas-liquid two-phase flow. measurement problem

[0006] The second object of the present invention is to provide a method for measuring the cross-sectional phase holdup of gas-liquid two-phase flow in the pipeline, so as to solve the problem that existing measurement methods cannot carry out online measurement of the phase holdup of gas-liquid two-phase flow and the scope of application Limitations, low accuracy of measurement results, etc.

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