基于Fluent的大型油罐主动防护系统注氮分析  

Analysis of Nitrogen Injection Parameters for Large Oil Tank Active Protection System Based on Fluent

作　　者：谭凯 贾海海 张艳丽 演强 李永生 董艳国 李俐莹 TAN Kai;JIA Haihai;ZHANG Yanli;YAN Qiang;LI Yongsheng;DONG Yanguo;LI Liying(Changqing Engineering Design Co.,Ltd;Daqing Oilfield Design Institute Co.,Ltd.)

机构地区：[1]长庆工程设计有限公司 [2]大庆油田设计院有限公司

出　　处：《油气田地面工程》2021年第6期57-61,70,共6页Oil-Gas Field Surface Engineering

摘　　要：大型外浮顶油罐一、二次密封空间内长期存在挥发性可燃气体,气体浓度达到一定值时将引发安全隐患,主动安全防护系统通过在密封圈内注入氮气实现气体惰化,为了提高油罐密封圈的氮封效率,需要分析各注氮参数对系统工作性能的影响。基于流体力学原理,以Fluent软件为工具,对一、二次密封进行简化,建立有限元模型,进行模型验证,并通过改变注氮流量、注入口尺寸和形状等参数得到密封圈气体惰化所需时间和气体用量。结果表明,同等流量下减小注氮口面积和沿密封圈切线双向注气能缩短惰化时间,降低气体注入流量能减少总气体用量。There are long-term volatile combustible gases in the primary and secondary seal space of large external floating roof oil tank.When the gas concentration reaches a certain value,it will become a potential safety hazard.The active safety protection system realizes gas inert by injecting nitrogen into the sealing ring.In order to improve the nitrogen sealing efficiency of the oil tank sealing ring,it is nec-essary to analyze the influence of nitrogen injection parameters on the system performance.Based on the principle of fluid mechanics,the primary and secondary seals are simplified and the finite volume model is established by Fluent software to verify the model.The time and gas consumption of gas inerting are obtained by changing the parameters such as nitrogen injection flow rate,injection port size and shape.The results show that the inerting time can be shortened by reducing the area of nitrogen injection port and bidirectional gas injection along the tangent line of sealing ring under the same flow rate,and the total gas consumption can be decreased by reducing the gas injection flow rate.

关 键 词：外浮顶油罐 密封圈 主动防护 流体分析 注氮参数 

分 类 号：TE972[石油与天然气工程—石油机械设备]