成品油输送管道中颗粒沉积对腐蚀的影响研究

Effect of Particle Deposition on Corrosion of Product Oil Transmission Pipeline

为了延长成品油输送管道的使用寿命,保障管道的正常高效运行,采用多功能管道式多相流动模拟试验装置评价了管道口径、弯头曲率以及管道倾角对固相颗粒沉积的影响,并在此基础之上,评价了固相颗粒沉积对成品油输送管道内壁腐蚀的影响。结果表明:管道口径越大、管道倾角越小,颗粒的沉积临界流速就越大,而随着弯头曲率的不断增大,颗粒的沉积临界流速则呈现出先降低后升高的趋势。油相流动速度越大、固相颗粒的尺寸越大,颗粒沉积对成品油输送管道内壁的腐蚀速率相对就越小;而随着颗粒注入量和含水量的不断增大,颗粒沉积对成品油输送管道内壁的腐蚀速率则呈现出先增大后减小的趋势。建议选择合适的管道口径、弯头曲率以及设置合理的管道倾角,以减少固相颗粒的沉积量,并控制合适的油流速度、固相颗粒含量、固相颗粒尺寸以及含水量,以最大限度地减弱固相颗粒沉积对成品油输送管道内壁的腐蚀程度。

In order to prolong the service life of the product oil transmission pipeline and ensure the normal and efficient operation of the pipeline, a multi-functional pipeline multiphase flow simulation test device was used to evaluate the effects of pipeline diameter, elbow curvature and pipeline inclination on solid particle deposition. On this basis, the effect of solid particle deposition on the inner wall corrosion of product oil transmission pipeline was evaluated. The results showed that the larger the pipe diameter and the smaller the pipe inclination, the greater the critical velocity of particle deposition. With the continuous increase of elbow curvature, the critical velocity of particle deposition first decreased and then increased. The larger the flow velocity of the oil phase and the larger the size of the solid phase particles, the smaller the corrosion rate of the particle deposition on the inner wall of the oil product pipeline. With the continuous increase of particle injection amount and water content, the corrosion rate of particle deposition on the inner wall of refined oil pipeline showed a trend of first increasing and then decreasing. It was suggested to select appropriate pipe diameter, elbow curvature and set reasonable pipe inclination to reduce the deposition of solid particles, and control appropriate oil flow velocity, solid particle content, solid particle size and water content, so as to minimize the corrosion of solid particle deposition on the inner wall of product oil transmission pipeline.