保温层失效对伴热稠油管道安全停输时间的影响  

Influences of insulation layer failure on safe shutdown time of heat tracing heavy oil pipeline

作　　者：王雷[1] 吴明[1] 贾冯睿[1] 姚尧[1] 曹先慧[1] 金盾[2] 

机构地区：[1]辽宁石油化工大学石油天然气工程学院,辽宁抚顺113001 [2]空军航空大学,吉林长春130022

出　　处：《油气储运》2013年第3期247-251,共5页Oil & Gas Storage and Transportation

摘　　要：针对伴热稠油管道在保温层失效后,安全停输时间难以确定的问题,基于有限体积法,建立了伴热稠油管道二维、非稳态分析模型。该模型考虑了稠油的凝固潜热影响,研究了保温层失效前后稠油管单独停输(案例I)与稠油管和伴热管双管同时停输(案例Ⅱ)情况下稠油管内温度场的变化规律,在此基础上,通过SPSS软件拟合了停输时间与停输后稠油平均温度的关系曲线,进而确定了伴热稠油管道在保温层失效前后的安全停输时间。保温层失效前后,案例I与案例Ⅱ油管内的温降规律基本相似。在保温层失效前,案例I与案例Ⅱ的安全停输时间分别为58h和54h,前者在伴热管的影响下,安全停输时间延长了4h;在保温层失效后,两种情况下的安全停输时间均缩短至11h,即伴热管对安全停输时间没有影响。With respect to difficulty of safe shutdown after failure of thermal insulation layer for heat tracing heavy oil pipeline, a 2D non-steady-state analysis model is built for the heat tracing heavy oil pipeline based on the finite volume method. Effects caused by latent heat of heavy oil solidification are considered in the model and change law of temperature field in the heavy oil pipe in the case （Ⅰ） of heavy oil pipe shutdown and in the case （Ⅱ） of shutdown for the heavy oil pipe and tracing pipe before and after the thermal insulation layer failure is studied. On this basis, the curve of relation between shutdown time and average heavy oil temperature after shutdown is fitted by using SPSS software to further determine safe shutdown time of the tracing heavy oil pipeline before and after failure of the thermal insulation layer. Temperature drops of oil pipe before and after failure of the thermal insulation layer in case Ⅰ and case Ⅱ＇s results are Similar in the law. With respect to safe shutdown time before failure of the thermal insulation layer, case Ⅰ and case Ⅱ receptively takes 58 h and 54 h, of which the former extends its safe shutdown time by 4 h due to impacts of the tracing pipe. After the thermal insulation layer fails, both cases reduce the safe shutdown time to 11 h, that is, the tracing pipe has no effect on the safe shutdown time. （9 Figures, 12 References）

关 键 词：伴热稠油管道 保温层 安全停输时间 温度分布 

分 类 号：TE973[石油与天然气工程—石油机械设备]