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

A technology of gas-liquid two-phase flow and measuring pipelines, which is applied in the direction of measuring devices, material analysis through optical means, instruments, etc., can solve the problem of low accuracy of measurement results, limitations, and inability to apply gas-liquid two-phase flow online measurement and other problems, to achieve the effect of online measurement, simple equipment, good monochromaticity and stability

Active Publication Date: 2014-02-05
HEBEI UNIVERSITY
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  • Abstract
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  • Application Information

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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

Method used

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

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Embodiment 1

[0048] Example 1: A device for measuring the cross-sectional phase holdup of gas-liquid two-phase flow in a pipeline.

[0049] Such as figure 1 As shown, the device for measuring the cross-sectional phase holdup of gas-liquid two-phase flow in a pipeline according to the present invention includes a near-infrared emitting device 1 , a near-infrared receiving device 2 , a data acquisition unit 3 and a computer 4 .

[0050] The near-infrared emitting device 1 is used to emit near-infrared light (wavelength 780nm ~ 2500nm) signal, and the near-infrared receiving device 2 is used to receive the gas emitted by the near-infrared emitting device 1 and passed through the pipe wall of the pipe 5 and the gas in the pipe 5. The near-infrared optical signal transmitted by the liquid two-phase flow, and the received optical signal is converted into an electrical signal. The data acquisition unit 3 collects the electrical signal from the near-infrared receiving device 2 and sends it to the ...

Embodiment 2

[0094] Embodiment 2: A method for measuring the cross-sectional phase holdup of gas-liquid two-phase flow in a pipeline.

[0095] combine figure 1 , the pipe 5 in this embodiment is the water-gas two-phase flow to be measured, the front end of the pipe 5 is connected to two single-phase pipes, the two single-phase pipes are respectively gas and water, and the two single-phase pipes are brought together in one place Afterwards, it is connected with the pipeline 5, and the water and gas are mixed together evenly to form the water-gas two-phase flow in the pipeline 5. Therefore, the actual cross-sectional phase holdup of the water-gas two-phase flow in the pipeline 5 can be calculated through the ratio of the water and gas two-phase fluids in the two single-phase pipelines.

[0096] During the specific measurement, at first the near-infrared emitting device 1 and the near-infrared receiving device 2 are installed on the outer wall of the pipeline 5 in the same cross section, and...

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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...

Claims

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Application Information

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IPC IPC(8): G01N21/359
Inventor 方立德赵宁孔祥杰李小亭董芳
Owner HEBEI UNIVERSITY
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