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

海底天然气水合物绞吸式开采的绞吸能力影响因素分析

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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°.

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。

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Authors and Affiliations

  1. School of Mechanical and Electrical Engineering, Central South University, Changsha, 410083, China

    Hai-liang Xu  (徐海良), Wei-yang Kong  (孔维阳) & Wen-gang Hu  (胡文港)

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  1. Hai-liang Xu  (徐海良)
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  2. Wei-yang Kong  (孔维阳)
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  3. Wen-gang Hu  (胡文港)
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Correspondence to Hai-liang Xu  (徐海良).

Additional information

Foundation item: Project(51775561) supported by the National Natural Science Foundation of China; Project(20130162110004) supported by the National Doctoral Foundation of China

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Xu, Hl., Kong, Wy. & Hu, Wg. Analysis of influencing factors on suction capacity in seabed natural gas hydrate by cutter-suction exploitation. J. Cent. South Univ. 25, 2883–2895 (2018). https://doi.org/10.1007/s11771-018-3960-z

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