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基于室内实验的海底渗漏甲烷气泡运动行为及吸附回收研究
Motion Behavior and Adsorption Recovery of Methane Bubbles in Sea-floor Leakage Based on Laboratory Tests
投稿时间:2021-05-06  修订日期:2021-12-01
DOI:
中文关键词:  甲烷气泡,室内试验,运动,吸附
英文关键词:methane bubble  laboratory experiments  movement  adsorption
基金项目:
作者单位邮编
苏丹仪 广州海洋地质调查局 510700
梁前勇 广州海洋地质调查局 510700
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中文摘要:
      海底甲烷渗漏可能影响海洋环境,乃至全球气候和碳循环,但目前我们对渗漏甲烷在海水中的运动行为了解有限。本文基于水体甲烷释放室内试验,研究了不同甲烷渗漏条件下的甲烷气泡行为及其运动特征。结果显示,甲烷气泡在上浮过程中发生合并、分离和破碎,运动轨迹呈“S”型。气泡尺寸及上浮速度随释放气体流量增大而增大。气泡运动还受水中障碍物影响,具体作用与释放气体流量、障碍物表面粗糙度及形态有关。以日本水合物试采数据开展模拟试验发现,短期释放大量甲烷会引起水流速度和动压力显著增大,进而可能影响水中建筑物。此外,水体甲烷吸附试验表明,经白炭黑疏水处理后,活性炭吸附能力可提高5%。以上结论对开展海域天然气水合物开发甲烷泄漏环境影响评价及防治有重要意义。
英文摘要:
      Methane leaked from the seabed may affect the marine environment, as well as the global climate and carbon cycle. However, we have limited knowledge of the movement of methane bubbles in the water column. Based on the laboratory experiments of methane release in water, the movement and characteristics of methane bubbles under different methane leakage conditions are studied. It is showed that methane bubbles merge, separate and break during their rise, and the movement path showed ‘S’ shape. The bubble size and rising velocity increase with the amount of gas increasing. The bubble movement is also affected by the obstacles in water, which is related to the amount of gas released, the roughness and shape of the obstacle surface. Using the data of natural gas hydrate production test in Japan, it is found that the short-term release of a large amount of methane will induce prominent increase in the velocity and dynamic pressure of the water, which may affect buildings in water. In addition, the methane adsorption experiments in water showed that the adsorption capacity of activated carbon could be increased by 5% after hydrophobic treatment. These conclusions are of great significance to the environmental impact assessment and prevention of methane leakage in the development of natural gas hydrate.
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