关键词:  电伴热; , 安全停输时间; , 数值模拟; , 温度分布; , 保温层

Abstract: The heavy oil electric heat pipe tracing twodimensional unsteady model was established to analyze the influence and the laws of heavy oil pipeline safety shutdown time under the thickness of pipe insulation, the number of heating pipes and location parameters. The results show that in the case of a single tube with heat, when the pipe thickness was respectively 60, 70 mm, and 80 mm, corresponding security shutdown time was about 26, 30 h, and 34 h| in the case of double pipes heating, the change of the angle between the two tubes had the smaller impact on the safety shutdown time, and the safety shutdown time was about 36 h.

Key words: Electric heating tracing, Safety shutdown time, Numerical simulation, Temperature distribution, Insulation layer