首页|Microscopic influence mechanisms of pre-adsorbed polysaccharide on the nucleation and growth of methane hydrate on metal surface

Microscopic influence mechanisms of pre-adsorbed polysaccharide on the nucleation and growth of methane hydrate on metal surface

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  • NETL
  • NSTL
  • Elsevier
© 2024Natural gas hydrate plugging in oil and gas pipelines leads to reduced delivery, equipment deterioration, and accidents. Corrosion alters the pipe surface, creating new sites for gas hydrate formation and increasing the risk of hydrate plugging. Microbiologically influenced corrosion (MIC) caused by biofilm adhesion is an important type of corrosion in offshore oil and gas pipelines. However, the influence of biofilm components on gas hydrate formation remains unclear. Molecular dynamics simulations were used to study how pre-adsorbed alginate (a representative biofilm component) on iron surface (steel pipe), effects the nucleation and growth of gas hydrate. Results demonstrated that the pre-adsorbed alginate inhibited hydrate nucleation by strongly adsorbing methane, causing it to aggregate within the alginate voids or form bubbles in solution. The reduced methane concentration in water and decreased spatial uniformity hindered the hydrate nucleation. However, the pre-adsorbed alginate promoted nearby hydrate seed growth by attracting methane to form a denser methane distribution locally. More methane molecules were then transported to seed cages, synergistically promoting hydrate seed growth. This study explores the microevolutionary mechanisms of gas hydrates effected by adsorbed biofilm polysaccharide on metal, providing insights into mitigating hydrate plugging caused by MIC in oil and gas pipelines.

Alginate flocFlow assuranceGas hydrateMicrobiologically influenced corrosionMolecular dynamics simulation

Luo R.、Zhong K.、Chen D.、Wang L.、Zi M.、Wu G.

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Institute for Ocean Engineering Shenzhen International Graduate School Tsinghua University||Department of Chemical Engineering Imperial College London

Institute for Ocean Engineering Shenzhen International Graduate School Tsinghua University

Institute for Ocean Engineering Shenzhen International Graduate School Tsinghua University||School of Environment Tsinghua University

School of Ecology Environment and Resources Guangdong University of Technology

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2025

10.1016/j.fuel.2024.133242

Fuel: A journal of fuel science

Fuel: A journal of fuel science

ISSN：0016-2361
年,卷(期)：2025.381(Pt.1)
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