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

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...

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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 measurement devices and methods involved in the above patents and the existing commercialized gas-liquid two-phase measurement devices have complex structures and high prices, which restrict their popularization and application, such as gas-liquid two-phase flow measurement at natural gas wellheads, etc.

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