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热油管道在运行过程中管内油温沿轴向逐渐降低,同时整条管道的运行工况随油流前行而不断变化,原油将从牛顿流体转变成非牛顿流体,不同流态下的管段摩阻损失不同,因而整条管道各段所需压头不同,应分段计算。以两泵站间无旁接输油管道的情况为例,计算求得不同进、出站油温对各流态管段长度、摩阻损失的影响,建立数学模型分析流态变化对输油管道系统运行费用的影响。对不同流态的输油方案进行比较,在确保完成输油任务的前提下,确定算例热油管道站间最佳输油方案。(表3,图4,参6)
During the operation of the hot oil pipeline, the temperature of the oil in the pipe gradually decreases along the axial direction. Meanwhile, the operating conditions of the entire pipeline change continuously with the oil flow. The crude oil will change from Newtonian fluid to non-Newtonian fluid. Friction loss is different, so the entire pipeline sections required head pressure is different, should be calculated in sections. Taking the case of non-adjacent oil pipelines between two pumping stations as an example, the influence of different inlet and outlet oil temperatures on the lengths and frictional resistance losses of the various fluid pipelines was calculated. The mathematical model was established to analyze the influence of fluid change on the operation of the oil pipeline system The impact of fees. Comparison of different flow patterns of oil delivery, to ensure the completion of the oil mission under the premise of determining the optimal hot oil pipeline station between the best oil program. (Table 3, Figure 4, reference 6)