Offshore adaptability enhancement mechanism of falling film flow outside the FLH2 channel tube during floating hydrogen energy storage and transportation

doi:10.16085/j.issn.1000-6613.2023-1123

Abstract

Abstract:

With the development of hydrogen production technology from offshore wind power and natural gas, the deep-sea energy interconnection system using hydrogen energy as the medium is constantly improving. Liquid hydrogen storage and transportation is an effective method for large-scale transportation and utilization of offshore hydrogen energy. Revealing the mechanism of falling film flow under offshore sloshing conditions is the key to realize efficient storage and transportation of floating hydrogen energy. In this paper, the method of floating visualization experiment and numerical simulation is conducted to reveal the offshore adaptability enhancement mechanism of falling film flow outside the FLH₂ (floating hydrogen liquefaction unit) channel tube during floating hydrogen energy storage and transportation, based on high-speed camera technology and sloshing platform, the coupled VOF and Level Set two-phase flow model and moving grid technology. The results show that the liquid film uniformity of the falling film flow outside the corrugated tube is better than the conventional circular tube, spiral grooved tube and square corrugated tube. Under the offshore conditions, the flow pattern of corrugated tube is stable, and the dry patch of corrugated tube surface does not appear. It is recommended to use the corrugated tube in the floating hydrogen liquefaction unit. Based on visual experiments and numerical simulation results, the evolution law of falling film flow pattern and a calculation correlation for film thickness of corrugated tube are obtained.

Key words: hydrogen storage and transportation, falling film flow, offshore adaptability, enhancement mechanism

摘要：

随着海上风电和天然气制氢技术的发展，以氢能作为媒介的深海能源互联互通体系正不断完善。液态氢储运是实现海上氢能大规模运输和利用的有效方法，揭示海况条件下降膜流动机理是实现浮式氢能高效储运的关键。本文基于高速摄像系统和晃荡平台系统，同时基于耦合的VOF和Level Set两相流模型和动网格技术，采用浮式微观可视化实验和数值模拟相结合的方法，研究氢能储运过程中FLH₂（浮式氢气液化装置）换热通道管外降膜流动的海上适应性强化机理。研究结果表明，与常规光圆管、螺纹波管和方波管相比，波纹管管外降膜流动的液膜均匀性较好。在海况下波纹管间降膜流动流型稳定，并且均未出现管壁表面干涸的现象，因此在浮式氢气液化装置FLH₂中推荐采用波纹管以强化其海上适应性。基于可视化实验和数值模拟结果，得到了降膜流动的流型演化规律，并拟合了波纹管外降膜流动的液膜厚度计算关联式。

关键词: 氢气储运, 降膜流动, 海上适应性, 强化机理

CLC Number:

TE646

SUN Chongzheng, LI Yuxing, XU Jie, HAN Hui, SONG Guangchun, LU Xiao. Offshore adaptability enhancement mechanism of falling film flow outside the FLH₂ channel tube during floating hydrogen energy storage and transportation[J]. Chemical Industry and Engineering Progress, 2024, 43(1): 338-352.

孙崇正, 李玉星, 许洁, 韩辉, 宋光春, 卢晓. 浮式氢能储运过程中FLH₂通道管外降膜流动的海上适应性强化机理[J]. 化工进展, 2024, 43(1): 338-352.

Figures/Tables 23

References 35

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Offshore adaptability enhancement mechanism of falling film flow outside the FLH₂ channel tube during floating hydrogen energy storage and transportation

浮式氢能储运过程中FLH₂通道管外降膜流动的海上适应性强化机理

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Figures/Tables 23

References 35

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