Gas Void Fraction Measurement of Gas-Liquid Two-Phase CO2 Flow Using Laser Attenuation Technique.

Haochi Wu,Quansheng Duan

doi:10.3390/s19143178

Abstract

The carbon capture and storage (CCS) system has the potential to reduce CO2 emissions from traditional energy industries. In order to monitor and control the CCS process, it is essential to achieve an accurate measurement of the gas void fraction in a two-phase CO2 flow in transportation pipelines. This paper presents a novel instrumentation system based on the laser attenuation technique for the gas void fraction measurement of the two-phase CO2 flow. The system includes an infrared laser source and a photodiode sensor array. Experiments were conducted on the horizontal and vertical test sections. Two Coriolis mass flowmeters are respectively installed on the single-phase pipelines to obtain the reference gas void fraction. The experimental results obtained show that the proposed method is effective. In the horizontal test section, the relative errors of the stratified flow are within ±8.3%, while those of the bubble flow are within ±10.6%. In the vertical test section, the proposed method performs slightly less well, with relative errors under ±12.2%. The obtained results show that the measurement system is capable of providing an accurate measurement of the gas void fraction of the two-phase CO2 flow and a useful reference for other industrial applications.

Highlights

IntroductionGlobal warming and climate change have caused many extreme weather events, such as droughts, floods and melting glaciers due to excessive anthropogenic CO2 emissions [1,2]
In recent decades, global warming and climate change have caused many extreme weather events, such as droughts, floods and melting glaciers due to excessive anthropogenic CO2 emissions [1,2].The carbon capture and storage (CCS) system is proposed to reduce the emissions of CO2
The photodiode array is designed to be parallel in two layers, but they cross each other along the pipe axis to avoid the dead space of the laser beams

Summary

Introduction

Global warming and climate change have caused many extreme weather events, such as droughts, floods and melting glaciers due to excessive anthropogenic CO2 emissions [1,2]. The carbon capture and storage (CCS) system is proposed to reduce the emissions of CO2. CCS uses the carbon capture technique to separate CO2 from the emissions in industrial and energy-related processes and stores the CO2 in the ocean, underground and other places [3]. The CCS technology is considered as one of the most important methods in dealing with the global climate change in the short term. A phase transition may occur due to the environment condition changes during transportation, which will result in the formation of a gas-liquid two-phase CO2 flow [5]. The gas void fraction is an important parameter of the gas-liquid two-phase

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Discussion

Conclusion