摘要
针对深海天然气水合物海开采系统的管道水力提升过程中,因水合物在压力降低的情况下部分气化而产生气体,使得矿浆垂直运输从传统两相流变成了三相流的问题,建立了沿管道方向压力和分解量与海洋深度的函数关系,求出了分解临界面的深度,以及与气体体积和密度等相关的参数;分析了管径、颗粒粒径、浆体流速、输送体积浓度和矿物密度5个参数对分解临界面和产生气体质量的影响,从而总结出沿管道的水力损失越小,临界分解面越深,分解出来的气体越多的规律,并选取了管径为300mm,颗粒粒径为10mm、浆体流速为1.65m/s、输送体积浓度为30%和矿物密度为1190kg/m3的最佳运输条件。
For deep-sea gas hydrate mining in the process of pipe hydraulic lifting system,some hydrates gasify as pressure decay,which makes the vertical lifting problem from the traditional two-phase flow into the three-phase flow.To establish function relationship between pressure and decomposition amount with sea depth along the pipe,the decomposition critical plane and some related parameters such as volume and density of gas were calculated.The effect of pipe diameter,particle diameter,slurry flow velocity,transportation volume fraction and mineral density on the decomposition critical plane and generating gas mass were analyzed,thus the law can be concluded that less hydraulic loss is,deeper the decomposition critical plane is,lager the gas decomposition amount is.And the optimal transportation condition were selected that pipe diameter is 300 mm,particle diameter is 10 mm,slurry flow velocity is 1.65m/s,volume fraction is 30% and mineral density is 1190kg/m^3.
出处
《海洋湖沼通报》
CSCD
北大核心
2015年第2期164-170,共7页
Transactions of Oceanology and Limnology
基金
国家自然科学基金项目(51375498)
博士点基金资助课题(20130162110004)资助
