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Optimization Analysis for Preheating Temperature and Pipe Wall Thickness ofLarge-Diameter Directly Buried Heating Pipes

机译：大口径直埋式加热管预热温度和管壁厚度的优化分析

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摘要

To prevent the problems from occurring in the preheating installation of directlyrnburied heating pipes with large diameter, high temperature and pressure, the presentrnpaper analyses constraints of the least-cost for preheating installation ofrnlarge-diameter directly buried pipes by applying the nonlinear programming theoryrnand establishing the objective function with the aim of pursuing the preheatingrninstallation’s least-cost. Taking medium steel pipe wall thickness and preheatingrntemperature as variables, this objective function works out the preheatingrntemperature and wall thickness of the least-cost preheating installation by usingrnMatlab Optimization Toolbox. The results of which show that the higher the pressurernis, the thicker the wall thickness and the lower the preheating temperature is, that thernbest preheating temperature is equal to the lowest preheating temperature limit. Inrnaddition, the highest preheating temperature limit is allowed to rise with thernincreasing of pipe wall thickness, but the increment of temperature is much lowerrnthan the decreasing amount of the lowest preheating temperature limit. Research alsornindicates that increasing the pipe wall thickness is effective in avoiding localrnbuckling, whereas, decreasing the preheating installation temperature is morerneffective than it in preventing the cooling abruption. Such conclusions are ofrnimportant guidance significance in several aspects such as reducing installation costrnof large-diameter heating pipes, saving preheating energy consumption, shorteningrnconstruction period, improving pipeline security and so on.
机译：为了防止大直径，高温高压的直埋式加热管预热安装中出现问题，本文运用非线性规划理论并建立了目标，分析了大口径直埋式管道预热安装成本最低的制约因素。以追求预热装置的最低成本为目的。该目标函数以中型钢管的壁厚和预热温度为变量，通过使用Matlab优化工具箱计算出成本最低的预热设备的预热温度和壁厚。结果表明，压力越高，壁厚越厚，预热温度越低，最佳预热温度等于最低预热温度极限。另外，允许最高的预热温度极限随着管壁厚度的增加而升高，但是温度的增加比最低的预热温度极限的减少量低得多。研究还表明，增加管壁厚度可有效避免局部屈曲，而降低预热装置温度则比防止冷却破裂更有效。这些结论对降低大口径加热管的安装成本，节约预热能耗，缩短工期，提高管道安全性等方面具有重要的指导意义。

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