管道埋深对稳定运行热油管道热力特性的影响

Effect of Buried Depth on Thermodynamic Properties of Hot Oil Pipeline in Steady Operation

基于管道不同埋深对热油管道热力特性的影响,首次提出了对不同埋深管段采用不同热影响半径的思想,利用有限元法求解了热油管道稳态运行时的热微分方程,并编制了相应的计算程序,从而对管道稳态运行时的轴向和横向温度场进行了更为准确的求解,并详细分析了管道埋深在不同季节对管道热力特性的影响。结果表明,在冬季,如果计算埋深比实际埋深大,将会使温度场计算结果偏高,从而影响管道的安全运行;反之,如果埋深值取得偏小,又会使温度场计算结果偏低,从而给管道运行带来一定的经济损失。而在夏季,管道埋深造成的影响正好相反。

Based on impact of buried depth on thermodynamic properties of hot oil pip＇eline, the method that pipe sections with different buried depths were treated with different radius of heat influence. Heat differential equation of hot oil pipeline in steady operation was solved by means of finite element method, and calculation software was programmed to calculate the axial and transverse temperature field of pipeline. It was found that the result calculated by the software was more accurate. The effect of buried depth on the thermodynamic properties of pipeline in different seasons was also discussed in detail. The results indicate that if the calculated depth is larger than the actual value in winter, the calculated result of temperature field is larger than actual value, which is adverse for safety of pipeline operation. Otherwise, a smaller calculated buried depth would generate a smaller calculated result of temperature field, which would lead to costly pipeline operation. In summer, the situation is the opposite.