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Numerical simulation on contaminated oil characteristics in bend pipe of batch pipelining of cold and hot crude oils
WU Yu guo1,2, CHEN Bao dong2, LI Xiao ling2, WANG Wei qiang2
(1.College of Storage & Transportation and Architectural Engineering in China University of Petroleum, Qingdao 266555, China;2.College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China)
Abstract:
According to the process of batch pipelining of cold and hot crude oils, a mathematical model for contaminated oil of batch pipelining of cold and hot crude oils was established based on current contamination theory. And the mathematical model was numerically solved by finite volume method. The characteristics of contaminated oil in vertical bend pipe were numerically simulated and analyzed. The results show that the change of the angle between gravity direction and pipe 's axial direction and the change of velocity distribution are the main factors influencing the characteristics of contaminated oil in vertical bend pipe. In horizontal straight pipe section, gravity direction is vertical to axial direction, which leads to the asymmetric distribution of contaminated concentration in the radial direction. While in vertical pipe section, gravity direction is vertical to radial direction and the contaminated oil volume is relatively large when the heavy oil is on the upper side. At bend and in the straight pipe after the bend, velocity distribution changes a lot and the high velocity area migrates. It leads to more contaminated oil, and the change of the shape of contaminated oil front and the migration of high concentration of posterior oil in the radial direction.
Key words:  batch pipelining of cold and hot crude oils  contaminated oil  bend pipe  finite volume method  numerical simulation