带隔流筒旋流快分系统新型工业催化裂化沉降器内气相流场的数值模拟

发布时间：2018-03-26 05:00

本文选题：催化裂化沉降器　切入点：压力平衡管　出处：《过程工程学报》2016年01期

【摘要】：采用RNG k??湍流模型模拟带隔流筒旋流快分系统工业催化裂化沉降器内的气相流场,基于沉降器内气相流场的分析,考察了压力平衡管截面尺寸及封闭罩直径对封闭罩内外气量分配的影响.结果表明,进入封闭罩外的汽提油气量随平衡管截面边长增加而增大,随封闭罩直径增加而减小.封闭罩阻止了分离系统内油气进入沉降器中.压力平衡管通过抽吸作用将封闭罩外的汽提油气快速引出沉降器,使封闭罩外的汽提油气在沉降器内的总停留时间降至13 s以下.平衡管截面边长小于310 mm时,汽提气的引出分为两路;平衡管截面边长大于310 mm时,汽提气全部进入封闭罩外部,且分离系统内的少量油气向下流出分离系统至沉降器内.封闭罩直径为3.8 m时,99%以上的油气都进入封闭罩外部.
[Abstract]:Adopt RNG k? ? The turbulent flow model is used to simulate the gas phase flow field in the industrial catalytic cracking (FCCU) precipitator, based on the analysis of the gas-phase flow field in the precipitator. The effects of the cross section size of pressure balancing tube and the diameter of seal cover on the distribution of gas volume inside and outside the seal cover are investigated. The results show that the amount of stripping oil and gas entering outside the sealing cover increases with the increase of the cross section length of the balance tube. It decreases with the increase of the diameter of the seal cover. The sealing cover prevents the oil and gas from entering into the settler in the separation system. The total residence time of the stripping oil and gas outside the seal hood is reduced to less than 13 s. When the side length of the equilibrium tube is less than 310 mm, the extraction of the stripping gas is divided into two ways, and when the side length of the equilibrium tube section is more than 310 mm, All the stripping gas enters the outer part of the seal cover, and a small amount of oil and gas in the separation system flows down to the settler. When the diameter of the seal cover is 3.8 m, more than 99% of the oil and gas enter the outer part of the seal cover.
【作者单位】：中国石油大学(北京)重质油国家重点实验室;
【基金】：国家重点基础研究发展规划(973)基金资助项目(编号:2012CB215000)
【分类号】：O357.5

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