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Delivery of inert gas through a vertical borehole using inert gas generator: A theoretical study
International Journal of Mining Science and Technology ( IF 11.8 ) Pub Date : 2020-03-21 , DOI: 10.1016/j.ijmst.2020.03.005
Rickard Hansen

The delivery of the inert gas through a vertical borehole using inert gas generator or IGG is investigated. Potential limitations and/or transient effects are highlighted. During the analysis, the borehole diameter, borehole length, type of borehole and partial condensation prior to entering the borehole were varied. A choked flow will occur for a contraction exit or borehole of 0.3 m in diameter if no condensation prior to the contraction occurs. If partial condensation takes place, a borehole diameter of 0.3 m will be possible if almost 50% of the water vapour condensates. However, pressure losses along boreholes with a diameter of 0.3 or 0.4 m are significant and could pose a challenge if trying to mitigate the pressure losses. Adding a booster fan prior to the inlet of the 0.4 m lined borehole would still be a challenge. The corresponding case with a 0.5 m borehole presents much more favourable pressure losses. The 0.5 m diameter lined borehole should be regarded as the lower threshold. The rapid heating of the unlined borehole surface will increase the risk of thermal spallation and possibly imposing restrictions. Understanding the mechanisms during gas delivery will increase the likelihood of a successful inertisation.



中文翻译:

使用惰性气体发生器通过垂直井孔输送惰性气体的理论研究

研究了使用惰性气体发生器或IGG通过垂直井孔输送惰性气体的方法。突出显示了潜在的局限性和/或瞬时影响。在分析过程中,改变了钻孔直径,钻孔长度,钻孔类型和进入钻孔之前的部分冷凝。如果在收缩之前没有凝结,直径为0.3 m的收缩出口或钻孔将发生cho流。如果发生部分冷凝,如果几乎50%的水蒸气冷凝,则孔直径为0.3 m是可能的。但是,沿直径为0.3或0.4 m的井眼的压力损失很大,如果要减轻压力损失,可能会带来挑战。在衬砌0.4 m的钻孔之前添加增压风扇仍然是一个挑战。相应的井眼为0.5 m的情况会带来更有利的压力损失。直径0.5 m的内衬钻孔应视为下限。无衬里的钻孔表面的快速加热将增加热剥落的风险,并可能施加限制。了解气体输送过程中的机理将增加成功进行惰性化的可能性。

更新日期:2020-03-21
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