Numerical Investigation of the Natural Gas-hydrogen Mixture Stratification Process in an Undulating Pipeline

doi:10.11885/j.issn.1674-5086.2022.06.20.02

Abstract

Abstract: The transportation of nature gas mixed with a specific volume of hydrogen is considered to be one of the green and economical ways to transmit hydrogen. In this research, a series of numerical simulations is conducted to capture the stratification process of natural gas mixed with different volume fractions of hydrogen in an undulating pipeline after the shutdown. The effects of the height of undulating pipeline on the process of gas stratification and the maximum hydrogen concentration are examined. An obvious shear effect between gas flows is observed in the inclined tubes of such undulating pipeline. The gas flow in the pipeline could be classified into four stages:initiation and enhancement stage of gas shear effect, vortex formation and shear attenuation stage, vortex extinction and flow stabilization stage, and flow deceleration and vertical stratification stage. The variation of gas concentration depends on the strength of gas flow. The increase of pipeline height or total volume intensifies the shear effect of gas flow, resulting in a longer consuming time for the stable stratification. Therefore, a safety window period for shutdown maintenance is important to be determined according to the risk value of hydrogen concentration.

Key words: undulating pipeline, transportation of nature gas mixed with hydrogen, numerical simulation, gas stratification, stabilization time

CLC Number:

TE832

ZHU Hongjun, CHEN Junwen, SU Huazhong, TANG Tang, HE Shan. Numerical Investigation of the Natural Gas-hydrogen Mixture Stratification Process in an Undulating Pipeline[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(6): 132-140.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2022.06.20.02

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2022/V44/I6/132

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