含蜡热油管道结蜡区对整体运行工况的影响

建立了两站间无旁接含蜡热油管道蜡沉积分布和运行工况数学模型：出站油温、周围环境温度及流量决定着含蜡热油管道的结蜡方位；管道结蜡后，结蜡段传热系数、流速、管道摩阻及管道沿线各流态长度等运行工况将发生变化。算例分析表明：管道沿线因存在结蜡层而使散热量降低，但提高管道出站油温，进站油温升高并不明显；随着结蜡起始点与出站之间距离的增加，管道沿线总摩阻基本呈线性降低且直线斜率较大；管输油品不同流态长度与管道沿线结蜡位置基本呈线性变化关系。（图3，表3，参11）。

Effect of wax deposit area in waxy hot oil pipeline on whole running conditions

A mathematical model of the wax deposit distribution and running conditions for waxy hot oil pipeline which have no floating between the two stations is built. The factors including outlet oil temperature, environmental temperature and flow determine the location of wax deposition in waxy hot oil pipeline. When there is wax deposition, running conditions such as waxy sections＇ heat transfer coefficient, flow velocity, pipeline friction and length of each flow pattern along the pipeline will change. The examples analysis shows that the heat radiation capacity decreases due to the existence of the wax along the pipeline. However, there is no obvious increase of the inlet oil temperature when increasing the outlet oil temperature. With the increase of the distance between the starting point of wax deposition and the outlet of station, the pipeline friction decreases in a linear manner with high slope. In addition, the length of different flow pattern of the oil in the pipe has a basic linear relationship with the location of wax along the pipe. （3 Figures, 3 Tables, 11 References）