【作者】 何秋良；

【导师】 王乐勤；

【作者基本信息】 浙江大学 ， 化工过程机械， 2004， 硕士

【摘要】 近年来石化工业管道事故频发，严重影响安全生产及企业经济效益。加氢裂化反应流出物空冷器(简称REAC)管束属于特种设备，承受高压临氢多相流的冲蚀，其失效易引发恶性事故。现有研究表明，REAC的腐蚀受一系列综合因素的影响，其中反应流出物的流动状况和腐蚀介质的浓度分布是二个关键因素。但迄今为止的研究只对腐蚀现象进行了定性分析，都没有系统地研究流动与腐蚀的定量关系。本文主要针对石化工业管道典型部件，如衬管、弯管等结构元件，进行CFD数值模拟，定量研究管道流动与腐蚀的关系，并进行结构优化。本文的主要研究内容及结论如下： 1．通过对流体流动与腐蚀的定量分析，揭示了反应流出物的腐蚀性、多相流物性、多种工况及流动特性对冲蚀破坏的实际影响； 2．详细探讨和分析得出国产化REAC管束腐蚀的失效机理，结论与实际状况比较吻合； 3．对优化结构后的REAC管束进行CFD模拟比较，并得到更加合理的结构形式； 4．对REAC出口弯管进行全面的CFD流动模拟，得到了弯管冲蚀破坏的流体动力学因素。 本论文的主要创新点在于： 1．提出了工业管道冲蚀破坏的一种有效预测方法。运用CFD软件对管道流体进行数值模拟，可以快速准确地找到冲蚀薄弱位置； 2．针对有衬管结构的REAC管束失效案例，采用FLUENT数值模拟，得到了REAC管束的实际爆管原因； 3．总结归纳出典型工业部件的管道冲蚀破坏规律，以指导结构优化设计和在线检测。更多还原

【Abstract】 In recent years, petrifaction industry pipes accidents were occured frequently, it badly affected safe and economic benefits. Hydrogenation cracking reaction outflow air-cooler (REAC) pipes is important devices, it was suffered high pessure, hydrogen and multiphase flow erosion. Badly accidents were easily arose. Research in existence indicates that erosion of REAC pipes were affected aseries of integrative factors, flow status of reaction outflow and consistency distributing of corrosion medium are two key factors. But so far, all researches about erosion phenomenas were just qualitative analysis, these researches did not study quantitative analysis between flow and corrosion by the numbers. This paper mainly aimed at typical petrifaction industry pipes such as liner-pipe, elbow etc. to be simulated by CFD software to quantitative study relation between pipe flow and erosion and optimize pipes structures. The main contents of this paper are summarized as follow:1. Actual infection which causticity of reaction outflow , corporality of multiphase , operation conditions and flow status erosion destroy was opened out by quantitative analyse relation between liquid flow and erosion, opened out;2. Invalidation mechanism of homemade REAC liner pipe was summed up by particular discuss and analyse, the results were fit for actual instance;3. Optimized REAC liner pipe structure was simulated by FLUENT, compared with pristine structure to find more reasonable structure;4. REAC exit elbow was simulated by FLUENT, hydrokinetics factors to explain elbow erosion were summed up;The innovations in the paper are as following:1. A new method to predict erosion destroy of industry pipes was advanced, CFD software was applied to simulate pipe flow to find position where erosion weakness quickly;2. FLUENT was applied to simulate liner pipes which had invalidation case , the actual reason of REAC pipes bursting was found;3. Rules of typical industry pipes erosion destroy was summed up to guide optimized-structure and inspection on line.更多还原