直埋热力管道保温厚度的影响因素及规律分析

Analysis of Factors Affecting Thermal Insulation Thickness of Buried Thermal Pipeline

利用虚拟热源法和经济厚度限定法,以管道DN1200为研究对象,构建直埋热力管道保温厚度计算模型,汇集保温厚度的影响因素并进行分析,提炼影响规律。研究发现,随着土壤导热系数的增大,保温厚度逐渐减小;土壤表面放热系数对保温厚度影响不大;随着地表温度的升高和覆土深度的加深,保温厚度逐渐增大。据此,提出工程上计算直埋热力管道保温厚度的建议:慎重选取土壤导热系数、管道覆土深度以及土壤表面温度等参数。

By using virtual heat source method and economic thickness limit method, the calculation model of thermal insulation thickness of buried thermal pipeline is established by taking pipeline DN1200 as the research object. The influencing factors of thermal insulation thickness are collected and the influencing principles are analyzed. It is found that, the insulation thickness decreases with the increase of soil thermal conductivity;the coefficient of heat release on soil surface has little effect on the insulation thickness;the insulation thickness increases with the increase of surface temperature and the deepening of soil cover depth. Accordingly, a suggestion for calculating thermal insulation thickness of buried thermal pipelines in engineering is put forward, namely, carefully selecting soil thermal conductivity, soil cover depth and soil surface temperature.