基于新型动态清蜡装置石蜡相变过程数值模拟

Numerical simulation of paraffin phase transition based on a new dynamic paraffin removal device

中文关键词: 热洗，石蜡熔化，相变传热，滑移网格，多相流

英文关键词: hot washing, paraffin melting, phase change heat transfer, sliding mesh, multiphase flow

中文摘要:

      针对输油管道结蜡问题，本文基于课题组所设计的新型动态清蜡装置建立物理模型和数学模型，通过FLUENT中的滑移网格模型、焓法模型和多相流模型研究装置内部石蜡相变熔化规律，分析了水温、冷指壁温和转数对该过程的影响。结果表明：增加水温和冷指壁温能够加快石蜡熔化，但水温和冷指壁温需在一定范围内调控，分别控制在348.15K±5和293.15K±5内以达到较好清蜡效果同时降低清蜡能耗；且冷指壁面的影响不容忽视，其存在使得熔化过程变慢，但只对熔化过程后期影响较大。转数在140 rpm内会抑制石蜡熔化，反之，增加转数，可提高石蜡熔化速率，大大地缩短熔化时间。模拟研究旨在揭示石蜡相变熔化规律并为实验研究提供理论依据和指导。

英文摘要:

      Aiming at the problem of wax formation in oil pipelines, this paper established physical model and mathematical model based on the new dynamic wax removal device designed by our research group, studied the phase change melting law of paraffin wax inside the device by using the slip grid model, enthalpy model and multiphase flow model in FLUENT, and analyzed the influence of water temperature, cold finger wall temperature and revolution number on the process. The results showed that increasing water temperature and cold finger wall temperature could accelerate the melting of paraffin wax, but the water temperature and cold finger wall temperature should be controlled within a certain range, controlled within 348.15K±5 and 293.15K±5, respectively, to achieve a better paraffin removal effect and reduce the energy consumption of paraffin removal. And the influence of cold finger wall can not be ignored, its existence makes the melting process slow, but it only has a greater impact on the later stage of the melting process. The number of revolutions within 140 revolutions per minute will inhibit the melting of paraffin, on the contrary, increasing the number of revolutions can improve the melting rate of paraffin and greatly shorten the melting time. The simulation study aims to reveal the phase change melting law of paraffin wax and provide theoretical basis and guidance for experimental research.