深海水下保温管汇传热特性分析

Study on Heat Transfer Characteristic of Manifold in Deepsea

以一个典型500 m深水保温管汇为对象,研究其在深水中的温度分布和传热特性规律。利用CFD软件模拟计算了管汇整体在正常运行时和发生事故停输后的温度分布。模拟结果显示,该管汇稳定运行时,生产管路温度较高,各条停输支管温度相对较低,并且停输支管长度越长,支管端部温度越低。支管端部是管汇的危险点,在保温时需要特别注意。在整个管汇事故停输后,管径较小的支管中心温度下降较快,更容易发生凝管事故。该结论对于深水管汇保温层的设计有一定的借鉴意义。

Taking a typical manifold in 500 m deep-water as the object of study,this paper studied its temperature distribution and heat transfer character in deep-water. The temperature distribution of manifold in steady production and shutdown were calculated by CFD. The result shows the temperature of production pipeline is higher and the temperature of pipeline shutdown is lower in steady production,and the longer of pipeline shutdown,the lower temperature in the end of pipeline. The end of pipeline is the dangerous point of manifold,which should be paid more attention. The temperature of pipeline with smaller diameter decreases quickly during the whole manifold shut down,which is more likely to condense. This conclusion can serve as a reference to insulation design of manifold in deepwater.