在原油管输过程中，液相介质内常含有一定量以H2S为主的酸性气体，这些气体具有极强的腐蚀性，常引发管道内壁不均匀腐蚀或点蚀，从而发生泄漏事故。通过对T形管内气液两相流的研究发现，两相介质在分支处的分布总是不均匀的。利用CFD软件对T型管道内原油与H2S气液两相流动进行了数值模拟，得到了稳定状态下管道中H2S的分布规律。结果表明，原油流经T型管道时，会在支管口背流处生成稳定H2S高浓度区；原油流速越大硫化氢浓度变化越大；速度的变化对硫化氢高浓度分布区的范围影响不大。为管道腐蚀防护、确保管道安全稳定运行提供了理论依据。
During the pipeline transportation of crude oil, liquid medium often contains a certain amount of acidic gases, primarily H2 S. These gases have very strong causticity which can cause uneven corrosion or pitting corrosion on pipeline wall leading to leakage accidents. By studying the gas-liquid two phases flow in T-pipeline, it was found that two phase media were always uneven at the branch. By numerical calculation of the two phases flow, the steady- state distribution law of H2 S in pipeline was obtained. The results show that when crude oil flows in T-shaped pipeline, it generates a constant high concentration of H2 S area in the backflow. The change of H2 S concentration increases with the increase of the velocity of crude oil; the change of speed has little effect on H2S concentration distribution. It may provides a theoretical basis for pipeline corrosion protection and ensuring the safe and stable operation of pipeline.
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