第18卷第1期 2018年2月
流动与传递
过程工程学报
The Chinese Jourmal of Process Engineering
Vol.18 No.1 Feb.2018
DOI: 10.12034/i.issn.1009-606X.217236
新型提升管进料段内压力脉动强度分布的影响因素
赵风静，边京，范怡平*
[中国石油大学(北京)重质油国家重点实验室，北京102249]
摘要：通过大型冷模实验，考察了油剂逆流接触提升管进料段内压力脉动强度的轴、径向分布，并结合射流气浓度分布、预提升气浓度分布和颗粒浓度分布分析了气固间作用特征及其对流动的影响。结果表明，根据喷嘴射流、预提升气及颗粒相对压力脉动的贡献，可将新型提升管进料段沿轴向由下而上分为喷嘴进气上游影响区(H=-0.375~-0.1m)、喷嘴进气控制区(H=-0.1~0.375m)及喷嘴进气下游影响区(H=0.375~0.675m).进料段内压力脉动相对标准偏差径向分布的模拟值与实验值吻合较好。
关键词：提升管；进料段；压力脉动：标准偏差：分布中图分类号：TQ016
文献标识码：A
文章编号：1009-606X(2018)01-0069-06
InfluencingFactorson Distributionof PressurePulsation Intensity
in Injection Zoneof aNovel FCCRiser Fengjing ZHAO,Jing BIAN,YipingFAN'
[StateKey Laboratory of Heavy Oil, China University of Petroleum (Bejing),Beijing I02249, China]
Abstract: The axial and radial distributions of pressure pulsation intensity in a catalyst-feed counter-current contacting injection zone were studied in a large-scale cold model experiment. Combined the distributions of pressure pulsation intensity with the concentration distributions ofthefeed jets, the pre-lift gas and the particles, the gassolid interaction characteristics as well as the influence of the pressure pulsation on the flow pattems were analyzed. The results showed that based on the contributions of the feed jets, the pre-lift gas and the particles, the whole feed injection zone can be divided into three parts, the jet gas upstream influence zone (H=0.3750.1 m), the jet gas controlling zone (H=0.1~0.375 m) and the jet gas downstream influence zone (H=0.375~0.675 m). The simulation results of radial
distribution of relative standard deviation of pressure pulsation in the injection zone agree well with the experimental data. Key words: riser; feed injection zone; pressure pulsation; standard deviation; distribution
1前言
催化裂化提升管进料混合段是喷嘴进料与催化剂最初接触、混合并迅速发生反应的区域[2]，直接影响产品的质量和分布．良好的产品分布要求进料混合段内油剂两相迅速均匀地接触且无轴向返混[3]，在传统进料段结构内，油气在近壁区浓度低中心区高，而催化剂呈相反的分布形态且在近壁区存在严重的颗粒返混[3]，研究者提出了改变进料角度、进料段变径和设置内构件等改进进料段结构的方案[3],闫子涵等[4-7]发现斜向下进料存在明显优势，并实验研究了油剂逆流接触提升管进
料段内两相的流动状态
压力脉动能反映气固相互作用等多种因素，因易于检测被广泛用于气固两相流的研究[8]vandeSchaaf等[9] 对气固循环流化床的压力脉动进行了傅里叶分析，指出其压力脉动的主要来源为气速波动和颗粒团聚物.胡小康等[10]考察了提升管内气固两相流的压力脉动，发现两相流的压力脉动由不稳定进剂引起的低频高幅脉动和颗粒团聚物、两相作用等耦合引起的高频低幅脉动叠加构成.vandeSchaaf等[11]在气固流化床中部引入一个脉冲，发现压力波动向下传播时无明显衰减，而向上传播时随传播距离延长线性衰减
收稿日期：2017-05-15，修回日期：2017-06-26
作者简介：赵风静(1992一），女，河北省乐亭县人，硕士研究生，研究方向为石油炼制设备，Tel:13263312358，E-mail:13263312358@163.com；范
平，通讯联系人，Tel:13521656390,E-mail:fanyipin2002@yaboo.com
引用格式：赵风静，边京，范怡平，新型提升管进料段内压力脉动强度分布的影响因素.过程工程学报，2018,18(1):69-74
Zhao F J, Bian J, Fan Y P. Influencing Factors on Distribution of Pressure Pulsation Intensity in Injection Zone of a Novel FCC Rise(in Chinese). Chin. J. Process Eng, 2018, 18(1): 6974, DOI: 10.12034/j.issn.1009-606X.217236.
万方数据