低温原油管道中压力传递速度的计算

原油管道中的压力传递速度是管道运行管理过程中需要掌握的重要参数。加热原油管道停输后,管内油品不仅会出现降温收缩,而且当温度降到一定程度后会出现屈服值;因此,热油管道停输后初始再启动的压力传递不同于一般流体中的压力传递,这时的压力传递速度除了与原油物性、管道状况有关之外,还与降温幅度、再启动时施加的压力大小和传递距离有关。应用质量守恒和动量守恒原理,推导出了既有温降收缩又有屈服值的原油管道再启动时的压力传递速度公式。

Calculation of Pressure Wave Speed in Cooled Crude Oil Pipelines

The pressure wave-speed shoule be mastered during the operation of crude oil pipelines. After the heated pipeline shut down, the oils shrinkage with temperature decreasing and the yield stress emerges when cooled to some extend. Therefore,hot-oil pipeline initial restart pressure wave-speed is different from that in usual fluid, which is dependent on the range of cooling, the exerted pressure and the propagated distance,besides crude oil and pipe properties. From the principles of momentum conservation and mass conservation, the formula of pressure wave-sppeed in the fluid with cooling contraction and yield stress has been derive.