双层喷嘴提升管油剂间传质传热特性研究  

Mass and Heat Transfer Characteristics Between Oil-Catalyst in Risers with Double-Layer Nozzles

作　　者：张智亮[1,2,3] 牟沛 李文军 陈海军 Zhang Zhiliang;Mou Pei;Li Wenjun;Chen Haijun(School of Mechanical Engineering,Southwest Petroleum University;CNPC Xibu Drilling Engineering Company Limited;Sichuan Zhongliyuan Construction Engineering Co.,Ltd.;PetroChina Urumqi Petrochemical Company)

机构地区：[1]西南石油大学机电工程学院,四川省成都市610500 [2]中国石油集团西部钻探工程有限公司 [3]四川中利源建设工程有限公司 [4]中国石油乌鲁木齐石化公司

出　　处：《石油机械》2022年第6期114-120,共7页China Petroleum Machinery

基　　金：国家重点基础研究发展计划项目“绿色低碳导向的高效炼油过程基础研究”(2012CB215004);国家科技重大专项“西部山前复杂地层安全快速钻井技术”(2011ZX05021-001);中国博士后科学基金资助项目“井下钻柱失效风险评估研究”(2019M663865)。

摘　　要：良好的相间传热与油雾蒸发效率是提高提升管内油剂之间催化裂化效率的关键。为了研究双层喷嘴提升管内油雾的传质传热与混合特性,采用SCDM软件建立了双层喷嘴提升管几何模型,并基于颗粒完全流态化理论,采用颗粒随机轨道模型对离散相油雾液滴轨迹进行追踪,模拟了提升管内油剂分布与传热规律。研究结果表明:提升管轴向位置0.6~0.8 m区段内温度和油雾蒸汽体积分数沿径向分布变化最大,温度呈现边壁高、中心低的“U”形分布,体积分数呈现边壁低、中心高的“环-核”分布,最后在提升管轴向位置0.8 m以上温度逐渐不变,稳定在620 K左右且分布均匀,油雾蒸汽体积分数稳定在0.7左右;在轴向位置0.7~0.8 m区段内油雾粒径变化剧烈,平均粒径最大值出现在轴向位置z=0.75 m的径向截面,在此区段内最不利于油雾催化裂化;副喷嘴应当安装于主喷嘴下方0.5 m处,此时催化裂化效率最高。所得结论可为双层喷嘴提升管的结构设计提供基础数据。Good interphase heat transfer and oil mist evaporation efficiency are the key to improve the catalytic cracking efficiency between oil-catalyst in risers.In order to study the mass transfer,heat transfer and mixing characteristics of oil mist in risers with double-layer nozzles,the geometric model of a riser with double-layer nozzles was established by SCDM software.Based on the theory of complete fluidization of particles,the droplet trajectory of discrete phase oil mist was tracked by means of particle random trajectory model,and the distribution and heat transfer regularity of oil-catalyst in risers were simulated.The results show that the temperature and oil mist vapor volume fraction change the most along the radial direction in the interval of 0.6~0.8 m in the axial position of the riser.The temperature shows a U-shaped distribution with high value in the wall and low value in the center;while the volume fraction shows a“ring-core”distribution with low value in the wall and high value in the center.At last,the temperature above 0.8 m in the axial position of the riser is constant gradually,stable at about 620 K with uniform distribution,and the oil mist vapor volume fraction is stable at 0.7.The oil mist particle size changes sharply in the axial position of 0.7~0.8 m,and the maximum average particle size appears in the radial section at the axial position of z=0.75 m,where it is the most unfavorable for oil mist catalytic cracking.The auxiliary nozzle should be installed 0.5 m below the main nozzle to get the highest catalytic cracking efficiency.The conclusions provide basic data for the structural design of risers with double-layer nozzles.

关 键 词：双层喷嘴 提升管 油剂混合 传热 油雾粒径 主喷嘴 安装位置 

分 类 号：TE621[石油与天然气工程—油气加工工程]