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PRAHBENEDICT,윤린 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.2
Recently, research focus has shifted from the prevention of hydrate formation in oil/gas pipelines, to the utilization of gas hydrate in various areas of application, such as cold storage, district cooling, and gas transportation. This study, investigated the pressure drop and flow pattern analysis of CO 2 hydrate slurry in the presence of anti-agglomerant in a flow loop. A series of experiments were carried out on CO 2 hydrate slurry with (10 to 32) % mass fractions at flow rates of (5 to 7) kg/min in the presence of (0, 0.3, 0.5, 0.7 and 1.0) wt.% concentration of Tween 80 (Polyoxyethylene (20) sorbitan monooleate) in a flow loop. The results show that the CO 2 hydrate slurry can be divided into two zones based on the pressure drop and temperature behavior; an active formation region, and a less active formation region. It was found that as the hydrate slurry mean flow rate was increased, the gradient of the pressure drop increased. From the flow visualization, three different flow regimes exist for CO 2 hydrate slurries, namely homogeneous, heterogeneous, and bedding flow, and those flow regimes were highly dependent on the hydrate fraction in the slurry mixture.
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Investigations on CO2 hydrate slurry for transportation in carbon capture and storage
PRAHBENEDICT,윤린 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.10
The flow characteristics of CO 2 hydrate in the presence of Tween 80 in a scaled-up test facility were investigated in order to further elucidate the potential of CO 2 hydrate slurry transportation in carbon capture and storage technology. Two formation processes were used to generate sufficient hydrate slurry for flow in a circulation loop of a 108 mm inner diameter pipe. The effects of Tween 80 concentrations on the four hydrate slurry parameters of pressure, temperature, density, and flow rate were studied and discussed. The results of the CO 2 hydrate slurry transportation experiments indicated that 0.7 wt.% of Tween 80 showed the optimal results for slurry stability, slurry temperature, and slurry density, but had no significant effect on slurry temperature during flowing in the loop. In all experiments, hydrate circulation was performed for an average duration of 80 min under stable conditions. The results suggest the possibility of transporting hydrate slurry over long distances under stable conditions with the addition of chemical additives.
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CO<sub>2</sub> hydrate slurry transportation in carbon capture and storage
Prah, Benedict,Yun, Rin Elsevier 2018 Applied thermal engineering Vol.128 No.-
<P><B>Abstract</B></P> <P>Based on a proposed hydrate-based gas separation and the utilization of this technology, CO<SUB>2</SUB> hydrate slurry transportation in pipeline from capture plants to storage sites is proposed in this paper. Two different transport processes are considered in the present study. The concept of CO<SUB>2</SUB> hydrate slurry transportation in pipelines has many advantages over the current approaches of CO<SUB>2</SUB> transportation. Transferring CO<SUB>2</SUB> in hydrate slurry status reduces energy input for transportation and eliminates of hydrate blockage in pipelines thus reducing the overall cost of gas transportation. The effect of CO<SUB>2</SUB> hydrate slurry formation in the absence and presence of anti-agglomerants is investigated in an experimental flow loop. The effect of four low dosages of 0.3, 0.5, 0.7 and 1.0wt% of anti-agglomerant; Tween 80 (non-ionic surfactant) on CO<SUB>2</SUB> hydrate is investigated. Discussions on CO<SUB>2</SUB> hydrate formation kinetics, induction time, slurry density and slurry flow within the experimental loop are provided. In the experiment, hydrate mass fraction ranged from 8 to 32%. The result indicates that CO<SUB>2</SUB> hydrate slurry flow and circulation in the flow loop is significantly enhanced with anti-agglomerant.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hydrate slurry mass fraction generated in the tests ranged from 8 to 32wt%. </LI> <LI> Circulation status for CO<SUB>2</SUB> hydrate slurry in a pipeline is highly enhanced with AA. </LI> <LI> CO<SUB>2</SUB> hydrate slurry was produced and maintained during circulation for an hour. </LI> </UL> </P>
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