杏九原稳装置原油换热器防沉积现场试验

Experimental Study on Anti Fouling Deposition of Crude Oil Heat Exchangers at Xing-9 Crude Oil Stabilization Unit

杏九原稳装置原油稳定率低,其中三元复合驱技术应用比重大是造成换热器堵塞的主要影响因素。根据换热器堵塞机理,采取了改变换热器折流板间距和管束材质两项技术改造措施,并在杏九原稳进行了防沉积效果的现场试验,连续运行4个月后,碳钢管束传热系数下降19.76%,不锈钢传热系数下降12.75%。检修期抽芯子观察,沉积堵塞好于其他换热器,同时原油稳定率明显提高。试验表明,提高原油流速有较好的防沉积堵塞效果,应用性能良好的管束材质也能减缓换热器的沉积堵塞。

Xing-9 crude oil stabilization unit has a rather lower ratio of stabilized crude oil.The survey and research shows that the reason is its larger ratio of oil produced by alkaline/surfactant/polymer flooding in its feed oil. Based on fouling deposition mechanisms of its crude oil heat exchangers,two technology reformation methods： changing baffles＇ space and changing tubes＇ material,are taken on exchangers and made field test.After 4 months continuous running, the heat transfer coefficient of modified exchangers drops 12.75%, which drops 19.76% in unmodified exchangers.Contrasted with other heat exchangers,the modified exchangers have a better anti fouling deposition property while observed during overhaul, which distinctively increase ratio of stabilized crude oil. This experiment shows that,for crude oil heat exchangers, increase of velocity of crude oil achieves a better anti fouling deposition effect and changes in tubes＇ material can retard fouling deposition.