关键词: 重力油水分离器, 分界面, 入口流速, 油相出口含油率, 水相出口占比

Abstract: The height of the separation interface in the gravity oil-water separator determines the volume ratio of the oil and water phases, which affects the height of the oil and water phases floating up or settling down in the separator, and has a direct impact on the separation effect. In order to investigate the influence of the height of separation interface on the separation effect of the gravity oil-water separator, numerical simulation is carried out using Fluent software to investigate the separation effect under different inlet flow rates and different water phase outlet flow ratios. The results show that the height of separation interface decreases with the increase of water phase export flow rate, and the lower the oil content in the inlet, the faster the height of separation interface decreases. As the height of separation interface decreases the oil content in the oil phase export gradually increases, and the separation effect is the best when the separation interface is in the vicinity of the axis of the separator, and the oil content of oil phase export can be up to 97%~98% under different inlet flow rates. As the height of separation interface decreases, the high-speed region behind the rectifier plate of the separator gradually moves down and the velocity gradient gradually decreases, which improves the velocity uniformity within the polystructure and reduces the influence of the radial velocity on the oil phase export, and thus improves the separation effect.

Key words: gravity oil-water separator, separation interface, inlet flow rate, oil content at oil phase outlet, water phase outlet flow ratio