LNG低温管道预冷及热应力分析

Analysis on the Pre-Cooling and the Thermal Stress Distribution of the LNG Low-Temperature Pipe

摘要: LNG低温管道预冷是LNG工程投产试运行的难点，采用FLUENT软件对Φ 630 × 10 mm低温管道进行BOG气体预冷工艺模拟，在0.2 m/s、0.5 m/s、1 m/s流速下，获得了BOG预冷过程的管道温度变化规律，以及低温管道在预冷过程中的实时温度显示。导出温度数据在ANSYS软件进行热应力分析，总结出低温管道预冷规律。

Abstract: The pre-cooling of LNG low-temperature pipe is a difficult point of completion and commissioning of LNG project. Under the flow rate of 0.2 m/s, 0.5 m/s and 1 m/s, FLUENT software is used to conduct simulation of BOG gas pre-cooling technology for Φ 630 × 10 mm low-temperature pipe to obtain temperature change regularity of pipe during BOG pre-cooling process and real-time display of temperature of low-temperature pipe during pre-cooling process. The temperature data are extracted into ANSYS software to calculate the thermal-stress and to formulate the pre-cooling plan of the low temperature pipe.