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Journal of Central South University

, Volume 25, Issue 12, pp 2883–2895 | Cite as

Analysis of influencing factors on suction capacity in seabed natural gas hydrate by cutter-suction exploitation

  • Hai-liang Xu (徐海良)Email author
  • Wei-yang Kong (孔维阳)
  • Wen-gang Hu (胡文港)
Article
  • 4 Downloads

Abstract

The mathematical and simulation models of working head in the deep-sea working environment were built to analyze the effects of cutter-suction flow, cutter-head rotating speed, cutting depth and suction port position on the cutter-suction capacity. The efficiency of the cutter-suction is analyzed based on the analysis of the variation law of the solid-phase volume fraction of the flow field, the variation law of the velocity distribution in the flow field and the distribution law of the solid-phase concentration. The results show that the increase of cutter-suction flow can significantly improve the cutter-suction efficiency when it is less than 1000 m3/h. However, when it is more than 1000 m3/h, it is helpless. When the cutter-head rotate speed is within the range of 10–25 r/min, the cutter-suction efficiency stabilizes at about 95%. While the speed is greater than 25 r/min, the cutter-suction efficiency decreases sharply with the increase of cutter-head rotate speed. With the increase of cutting depth, the cutter-suction efficiency first increases and then remains stable and finally decreases. The cutter-suction efficiency remains at about 94% when the suction port position deviation ranges from 0° to 30°, but it has a sharply reduction when the deviation angle is more than 30°.

Key words

seabed natural gas hydrate working head solid-liquid two-phase flow cutter-suction capacity influencing factor 

海底天然气水合物绞吸式开采的绞吸能力影响因素分析

摘要

本文根据切削头的结构和工作原理建立数学模型和计算机模型,研究了深海环境下切削头绞吸 流场模型中绞吸流量、绞刀转速、挖掘深度和吸口位置对绞吸能力的影响。通过分析绞吸流场的出口 固相体积分数变化规律、流场速度分布变化规律、固相浓度分布规律,间接分析了绞吸效率。结果表 明:在1000 m3/h 绞吸流量内增加绞吸流量能够明显有效地提高绞吸的效率,当超过1000 m3/h 时,绞 吸效率不再提高,维持在一个相对较高的稳定水平。当绞刀转速在10~25 r/min 范围内时,绞吸效率 稳定在95%左右的较高水平,当转速大于25 r/min 时,绞刀转速增加,绞吸效率降低。当绞刀的挖掘 深度低于0.5 m 时,绞吸效率随着挖掘深度的增加而增加,在0.5~0.7 m 之间时,管道入口固相体积 分数较高,绞吸效率也达到了最高值,当大于0.7 m 时,绞吸效率随着挖掘深度的增加反而降低。当 吸口位置偏离角度为0~30°时,切削头绞吸效率在94%以上且差别不大,当偏离位置大于30°时,切 削头绞吸效率急剧下降。

关键词

海底天然气水合物 切削头 固液两相流 绞吸能力 影响因素 

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Copyright information

© Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Hai-liang Xu (徐海良)
    • 1
    Email author
  • Wei-yang Kong (孔维阳)
    • 1
  • Wen-gang Hu (胡文港)
    • 1
  1. 1.School of Mechanical and Electrical EngineeringCentral South UniversityChangshaChina

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