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System for measuring phase fraction and phase interface in multiphase pipe flow by using monofilament capacitance probe

A single-wire capacitance probe and measurement system technology, applied in the direction of material capacitance, etc., can solve problems such as changes and affect the dielectric constant of liquid phase, and achieve the effect of eliminating the influence of measurement results and high measurement accuracy

Inactive Publication Date: 2006-11-22
XI AN JIAOTONG UNIV
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Problems solved by technology

However, the measurement results of this type of capacitance method also change with the change of the dielectric constant of the liquid phase, and factors such as the temperature of the liquid phase and the impurity components in the liquid phase significantly affect the dielectric constant of the liquid phase. In order to measure accurately, it must be Continuous correction of measurement results
In experimental research or actual industrial multiphase pipe flow, the fluid conductivity and permittivity are often changing, so the current conductivity and capacitance methods cannot achieve continuous analysis of the phase holdup and phase interface structure of multiphase pipe flow. real-time online measurement

Method used

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  • System for measuring phase fraction and phase interface in multiphase pipe flow by using monofilament capacitance probe
  • System for measuring phase fraction and phase interface in multiphase pipe flow by using monofilament capacitance probe
  • System for measuring phase fraction and phase interface in multiphase pipe flow by using monofilament capacitance probe

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Embodiment Construction

[0015] The structural principle and working principle of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0016] see figure 1 , the present invention comprises a monofilament capacitive probe device 18 and a capacitive voltage conversion circuit 19 and a signal processing device 20 connected with the monofilament capacitive probe device 18, and the capacitive voltage conversion circuit 19 converts the monofilament capacitive probe device 18 The capacitance value of the silk capacitive probe is converted into a DC voltage, and the voltage value is transmitted to the signal processing device 20, and the signal processing device 20 realizes the control of opening and closing of the capacitance-voltage conversion circuit 19 and realizes data processing, display, storage and printing and other functions.

[0017] see figure 2 , the monofilament capacitive probe device 18 of the present invention comprises the monofi...

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Abstract

The detection system for phase content rate and interface in multiphase tube flow comprises: a single-wire capacitor and probe device, and a connected C / V conversion circuit to convert the capacitor value of probe into dc voltage and send to following device, and a signal process device to control last circuit and process, display and store data. This invention eliminates effect of fluid electric feature to detection result, and realizes real-time and on-line detection with well precision.

Description

technical field [0001] The invention relates to a continuous real-time on-line measurement system for phase holdup and phase interface in multiphase pipe flow, in particular to a single-wire capacitance probe measurement system for phase holdup and phase interface in multiphase pipe flow. Background technique [0002] Gas-liquid, liquid-liquid, oil-gas-water multiphase pipe flow is widely used in energy, power and petroleum, chemical and other industrial fields. The cross-sectional phase holdup that changes in real time is one of the most basic and important characteristic parameters in multiphase pipe flow. In stratified flow, annular flow and slug flow, there is a continuous phase interface structure, which has a significant impact on the heat transfer, mass transfer and resistance characteristics of multiphase pipe flow. The real-time and accurate measurement of cross-sectional phase holdup and phase interface structure of multiphase pipe flow is one of the key technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/22
Inventor 郭烈锦顾汉洋张晨鸣
Owner XI AN JIAOTONG UNIV
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