Method and device for online measurement of gas-phase flow rate of gas-liquid two-phase flow based on single throttling element

A gas-liquid two-phase flow, throttling element technology, applied in the field of multi-phase flow measurement, can solve the problems of high price, difficult to guarantee the ratio consistency, restricting popularization and application, etc.

Active Publication Date: 2012-10-31
XI AN JIAOTONG UNIV
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Problems solved by technology

The problem with this method is that it is difficult to ensure the consistency of the gas-liquid ratio of the fluid in the split metering part and the ratio in the main pipeline, and the sampling ratio itself may be affected by factors such as flow patterns and flow fluctuations.
However, the measur

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  • Method and device for online measurement of gas-phase flow rate of gas-liquid two-phase flow based on single throttling element
  • Method and device for online measurement of gas-phase flow rate of gas-liquid two-phase flow based on single throttling element
  • Method and device for online measurement of gas-phase flow rate of gas-liquid two-phase flow based on single throttling element

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[0017] In the following, the method for measuring the gas-phase flow rate of the single-differential pressure gas-liquid two-phase flow of the single-throttle element of the present invention will be further described with reference to the drawings and taking the V-cone throttle element as an example.

[0018] See figure 1 , The general implementation of the present invention. The differential pressure flowmeter 1 is installed on the measuring pipe 3 through the flange 2 (or other connection method), the pressure transmitter 4 measures the pressure of the gas-liquid two-phase flow passing through the differential pressure flowmeter 1, and the differential pressure transmitter 5 The pressure difference of the differential pressure flowmeter 1 is detected, and a temperature transmitter 6 is installed downstream of the flowmeter to obtain the temperature of the gas-liquid two-phase flow. The pressure, temperature and pressure difference measured by the pressure transmitter, tempera...

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Abstract

The invention discloses a method and a device for online measurement of gas-phase flow rate of a gas-liquid two-phase flow based on a single throttling element. The method comprises the steps of: firstly, calibrating through an indoor experiment to acquire a fitting relation between a two-phase flow rate coefficient K and a Lockhart-Martinelli parameter XLM, a gas Froude number Frg as well as a gas-liquid density ratio, and a fitting relation between K and a liquid Froude number Frl, the gas Froude number Frg as well as the gas-liquid density ratio, and thereby establishing a two-phase flow rate measurement model; and then, iterating to obtain gas-phase mass flow rate according to measured two-phase pressure and temperature as well as differential pressure signals at two ends of the throttling element. The method disclosed by the invention has the characteristics of simple system, low cost and higher precision, and can meet the measurement requirement of an industrial field.

Description

technical field [0001] The invention belongs to the field of multiphase flow measurement, and relates to a method and device for online measurement of gas-liquid two-phase flow, in particular to a method and device for online measurement of gas-phase flow of gas-liquid two-phase flow based on a single throttling element. Background technique [0002] Gas-liquid two-phase flow widely exists in industrial fields such as petroleum, chemical industry, nuclear energy, refrigeration and metallurgy. The measurement of gas-liquid two-phase flow is of great significance to industrial production. For example, in the process of natural gas production, the wellhead product of a gas well is often a gas-liquid two-phase flow with water and condensate, and this two-phase flow is an important basis for monitoring the dynamic characteristics of gas wells and gas reservoirs. For the measurement of gas-liquid two-phase flow, the methods currently used mainly include separation methods and on-l...

Claims

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Application Information

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IPC IPC(8): G01F1/88
Inventor 白博峰贺登辉
Owner XI AN JIAOTONG UNIV
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