预热管道中原油沿程温降和土壤温度场数值模拟

Numerical Simulation on Soil Temperature Field Around Underground Hot Oil Pipelines and Medium Temperature-Drop in the Process of Staring

制定科学合理的埋地管道预热工艺,需要准确预测埋地管道周围土壤温度场和管内油品温度变化情况。用有限元法对埋地管道预热过程中管道周围土壤温度场和管内油品温度进行数值计算,得出了不同时刻埋地管道周围土壤温度的分布和管内油品沿程温度变化情况。通过对计算结果分析表明,预热介质、不同介质混合预热时间、土壤温度、气候条件等对管内油品沿程温降有很大影响。通过计算可确定经济、安全的管道混合预热工艺。该方法的应用可为热油管道经济、安全的预热投产提供一定的理论依据。

For drawing up science and reasonable preheating process of buried pipeline, the change of soil temperature field around pipeline and oil temperature within pipeline were accurately forecasted. The soil temperature fields around the buried pipeline in the process of preheating and oil temperature within pipeline were numerically simulated through using finite elements method,found out how the soil temperature around pipeline distribute and oil temperature within pipeline change at different time. Analysis the calculation results show that the on--way temperature dropping of oil in pipeline is influented obviously by comprehensive factors,such as preheating medium, time of preheating mixed medium, soil temperature, climate condition etc. Determination of economy and safe process of preheating mixed medium can make commissioning to operate economically and securely.