Method for measuring gas fraction of two-phase flow based on ultrasonic dual-frequency signal

Abstract

The invention discloses a method for measurement of two-phase flow gas holdup based on an ultrasonic two-frequency signal. The method comprises the steps of: arranging an ultrasonic transmitting probe and an ultrasonic receiving probe respectively at both ends of a section of straight pipeline needing two-phase flow gas holdup measurement; by means of the ultrasonic transmitting probe, generating two ultrasonic signals that are propagated along the fluid in the straight pipeline and have the excitation frequencies of a first excitation frequency and a second excitation frequency respectively; detecting the characteristic parameters of the received two ultrasonic signals by the ultrasonic receiving probe; and calculating the gas holdup according to the first excitation frequency, the second excitation frequency, the pure liquid propagation velocity, the resonant frequency of bubbles in the two-phase flow, the bubble vibration damping and the characteristic parameters of the two ultrasonic signals. The ultrasonic probes are installed on the outer wall of the straight pipeline, and are not needed to be arranged in the two-phase flow in the pipeline, thus realizing non-contact measurement of the two-phase flow gas holdup. The data processing amount is very small, and flow of the two-phase flow in the pipeline is not hindered in the measurement process.

Description

technical field [0001] The invention relates to the field of gas fraction measurement of two-phase flow, in particular to a method for measuring gas fraction of two-phase flow based on ultrasonic dual-frequency signals. Background technique [0002] Two-phase flow is a very common flow form in nature and industrial processes. Due to the complexity of the flow state, how to accurately measure the gas content of gas-liquid two-phase flow has always been an important issue to be solved in scientific research and industrial processes. [0003] The measuring methods and disadvantages of several gas-liquid two-phase flow gas fractions recorded in the prior art are as follows: [0004] 1. Li proposed a method based on γ-rays to measure the gas holdup of two-phase flow. The working principle is that when the γ-ray penetrates the fluid, its amplitude will attenuate, and the attenuation degree is related to the gas holdup of the two-phase flow. Through By detecting the attenuation de...

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Problems solved by technology

[0013] The invention provides a method for measuring the gas content of two-phase flow based on ultrasonic dual-frequency signals, so as to solve the problem of using a contact detection method that hinders the flow of the two-phase fluid in the existing gas content measurement technology of two-phase flow, complex detection principles and data processing high volume technical issues

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