长输管道真空干燥抽气段和盲段干燥效果差异分析

Simulation of Vacuum Desiccation at Blind and Exhausting Ends of Long-Distance Natural Gas Pipeline

新建天然气长输管道真空干燥过程中容易出现抽气段被迅速干燥,而盲段液态水沉积难以被干燥的现象,导致达不到干燥要求。本文针对该现象,建立了数学模型,从根本上分析上述问题产生的原因和影响因素。此外,详细阐述了真空干燥机理,并以此为基础,结合数学模型,分析了管道内径、管内温度、真空干燥机组抽速等对长输管道最长干燥段的影响。根据分析结果并结合工程实践,提出长输管道真空干燥优化方案。

The vacuum desiccation of the long-distance natural gas transportation pipeline was physically modeled and mathematically simulated,to address the two key problems：one is the rapid drying at the gas exhausting end,and the other is the water vapor condensation and water accumulation at the blind end.The impacts of the desiccation conditions,such as the inner diameter of the pipeline,temperature,and pumping speed,on the maximum desiccated length,lmax,of the long-distance pipeline were evaluated.We suggest that the combination of the simulated results with the engineering practice may be of much technological interest in optimization of the vacuum desiccation of the long-distance pipeline.