管道停输开挖过程传热数值计算

The Numerical Calculation of Pipeline Heat Transfer during the Periods of Shut Down and Excavation

埋地管道在运行过程中有时会因意外情况而需要停输。在停输过程中,管内油品的温度和土壤温度场的变化很大,会影响管道的安全输送,因此研究停输过程中管内油品的温度和土壤温度场对埋地管道的安全运行有重要的意义。模拟了埋地管道停输时土壤开挖过程中的土壤区、管内油温以及开挖区等三个区域的温度场变化情况,并模拟了开挖区域温度的变化对土壤温度场、管内油温的影响,得出了管内油温和土壤温度场的变化规律,研究结果可为管道的安全生产提供一定的科学依据。

When buried pipeline was running,there were many factors could cause shutdown phenomenon.This could cause serious economic losses.Oil temperature and soil temperature were the important parameters for pipeline shutdown security.So it was significant to study oil temperature field and soil temperature field for the safe operation of buried pipeline.It was simulated that the excavation area temperature during the shutdown of the pipeline.And the simulation was three-dimensional. Calculation areas contained three parts：soil area,pipeline internal area and the excavation area.These temperature fields were changed after excavation.And the changes of these three areas were simulated.The safety shutdown time was obtained by pipeline internal oil temperature changes.The oil temperature was declined after excavation.The influence of excavation area was obtained by observing the oil temperature.The temperature decline reflected the influence range.The results provided a reference for the safety production.