埋地热油管道经济埋深的计算模型

以埋地热油输送管道管沟开挖投资的年分摊费用和管道运行中的年热力损失费用之和作为目标函数,给出了埋地热油输送管道经济埋设深度的计算模型,模型考虑了埋设深度、保温材料、保温厚度和土壤性质对传热系数的影响。实例计算表明,传热系数随埋深的变化明显地影响着经济埋深的程度,给出的模型既较好地反映了各因素对经济埋深的影响规律,又避免了传热系数取值的盲目性,而且模型计算能够快速收敛。该模型可为热油输送管道施工的工艺优化设计提供一定的理论依据。

A Calculation Model for Economic Depth of Buried Hot Oil Transportation Pipelines

A calculation model for economic depth of buried hot oil pipelines using the sum of the apportioned charges per year in pipe ditch excavation investment and that of the thermal loss in pipe operation is given as a object function in this paper,considering the effect of heat transfer coefficient influenced by the buried depth,insulator material, insulator thickness and soil nature. An actual example shows that the buried depth economically is affected obviously by the changeable heat transfer coefficient with varying pipe buried depth, and the model mentioned in this paper not only better reflects the influence in differentaspects,but also avoids the blindness of the heat transfer coefficient,and it can quickly converge as well. This model can provide some theoretical basis for the technological optimal design in the construction of buried hot oil pipelines.