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Oil-gas two-phase flow measuring method based on copacitance chromatorgraphy imaging system and its device

A technology of electrical capacitance tomography and measurement methods, which is applied in the direction of material capacitance, etc., and can solve problems such as lack of good measurement methods

Inactive Publication Date: 2004-10-20
ZHEJIANG UNIV
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Problems solved by technology

[0006] Oil-gas two-phase flow is a common gas-liquid two-phase flow, which widely exists in petroleum (oil and gas field exploitation and oil and gas transportation), chemical industry, oil refining, power and other fields. Measurement is of great significance to energy storage, pipeline transportation, process control and metering and accounting, but there is no good measurement method at present

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  • Oil-gas two-phase flow measuring method based on copacitance chromatorgraphy imaging system and its device
  • Oil-gas two-phase flow measuring method based on copacitance chromatorgraphy imaging system and its device
  • Oil-gas two-phase flow measuring method based on copacitance chromatorgraphy imaging system and its device

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[0022] The characteristic parameters of a two-phase fluid composed of media with different dielectric constants can be measured by electrical capacitance tomography. For two-phase fluids with different dielectric constants, when the spatial distribution or concentration (holdup) of each phase component changes, it will cause the dielectric constant distribution of the two-phase fluid on the tube section to change, so that the measuring electrode The capacitance between the pairs changes. Using an array capacitive sensor, through the combination of electrodes, measuring these capacitance changes can reflect the concentration of the two-phase fluid and the phase distribution on the tube section. Using the measured value of these capacitance changes as projection data, using a suitable image reconstruction algorithm, the phase distribution image of the two-phase fluid flowing through the pipeline cross-section at a certain moment can be reconstructed to realize the visualization ...

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Abstract

A method based on capacitance chromatographic imaging system for measuring the two-phase oil-gas stream features that a reverse projection algorithm is used to reconfigure the oil-gas stream's medium distribution image to real-time show the stream type in pipeline, a fuzzy pattern recognization is used for in-line automatic recognization of stream type, a combined image rebuilding algorithm is used to rebuild the image for showing oil and gas distribution, and the image is processed to obtain the porosity of the oil-gas stream. Its equipment is composed of array-type capacitance sensor, data acquisition unit and computer. Its advantages are high speed and high precision.

Description

technical field [0001] The invention relates to the measurement of oil-gas two-phase flow, in particular to a method and device for measuring oil-gas two-phase flow based on an electrical capacitance tomography system. Background technique [0002] Two-phase flow systems are widely used in many industrial fields such as petroleum and chemical industry. The measurement of two-phase flow parameters, such as flow pattern and void ratio, is of great significance to industrial production. Due to the complexity of the two-phase flow system, the on-line measurement of these parameters is very difficult. At present, there are very few two-phase flow on-line measurement instruments that can be applied to the actual industry. [0003] In the actual industrial two-phase flow system, the difference in the two-phase flow pattern not only affects the flow characteristics, heat transfer and mass transfer performance of the two-phase flow, but also affects the r...

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Application Information

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IPC IPC(8): G01N27/22
Inventor 黄志尧冀海峰谢代梁王保良李海青
Owner ZHEJIANG UNIV
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