文献类型：期刊文献

中文题名：乙苯蒸汽过热器壳程流场模拟与换热性能分析

英文题名：SIMULATION OF SHELL FLOW FIELD AND ANALYSIS OF HEAT TRANSFER PERFORMANCE OF ETHYLBENZENE STEAM SUPER-HEATER

作者：刘棒[1];李瑞江[1];史怡坤[1];朱学栋[1];朱子彬[1]

机构：[1]华东理工大学大型工业反应器工程教育部工程研究中心

年份：2019

卷号：50

期号：6

起止页码：104

中文期刊名：石油炼制与化工

外文期刊名：Petroleum Processing and Petrochemicals

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD_E2019_2020】；

基金：中国石油化工股份有限公司资助项目(414061)

语种：中文

中文关键词：流场模拟;乙苯过热器;FLUENT模拟;支持板

外文关键词：flow field simulation;ethylbenzene super-heater;FLUENT simulation;support plates

摘要：基于几何和雷诺数 Re s 相似理论建立管壳式乙苯蒸汽过热器计算模型,利用FLUENT 17.2软件模拟过热器流场,分析壳程质量流量对壳程换热系数、壳程压降、综合评价因子 Nu × Pr ^-1/3 的影响规律,研究壳程附件对流场及换热的影响。结果表明:过热器壳程流场分布不均,折流板背风面存在流动死区;随着流量增大,壳程换热系数和压降增加,在对数坐标下拟合 Res 与 Nu × Pr^-1/3 时有良好的线性关系,数值模拟结果与经验方法Bell-Delaware得到的结果吻合较好;增加折流板数时,单位压降下的传热系数减小,流动死区减小,壳程压降和换热系数增大;旁路挡板能有效地减弱旁流流量并提高换热效果,防冲管有助于提高壳程进口端流场均匀性;支持板会造成壳程流量分配严重不均,壳程换热系数和压降降低,严重影响了过热器的整体换热效果。通过流场模拟与换热性能分析,发现支持板的设置是工业乙苯过热器换热性能变差的一个重要原因。
Models of shell and tube ethylbenzene-steam super-heater were established based on the theory of similarity in geometry and the number of Re s .The FLUENT 17.2 was used to simulate the flow field of super-heater.The impact of mass flow in shell-side on heat transfer coefficient,pressure drop,value of Nu·Pr ^-1/3 were investigated.At the same time,the influences of accessories of shell-side on the flow field and heat transfer were studied.The results showed that the distribution of flow field is uneven in shell-side and there exists flow dead zones on the lee surface of the baffles.As the flow rate increases,the heat transfer coefficient and pressure drop enlarge.Fitting Nu·Pr ^-1/3 and Re s in logarithmic coordinates,the curves had a good linear relationship.The simulation results had a good agreement in heat transfer coefficient and pressure drop with the Bell-Delaware method;under the identical pressure drop,the heat transfer and flow dead zones decrease with the increase of baffles in number,while the pressure drop in shell-side and heat transfer coefficient increased;the bypass baffles could effectively reduce the bypass flow to improve heat transfer.And the anti-flush tube could improve the flow field uniformity at the inlet of the shell.The support plates caused uneven distribution of flow in shell-side and lowered the heat transfer coefficient and pressure drop of shell-side decreased,which adversely affect the overall heat transfer coefficient of the super-heater.By the simulation of flow field and heat transfer performance,it is found that the setting of the support plates is an important reason for the deterioration of the heat transfer performance of the industrial ethylbenzene super-heater.