多因素耦合的大型乙烯裂解炉管损伤机理与损伤发展

项目名称： 多因素耦合的大型乙烯裂解炉管损伤机理与损伤发展

项目编号： No.51305440

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 机械、仪表工业

项目作者： 沈利民

作者单位： 中国矿业大学

项目金额： 25万元

中文摘要： 大型乙烯裂解炉的损伤机理与损伤演化研究涉及到金属学、力学、机械以及计算科学等不同领域，是一个多层次、多尺度的复杂问题。材料构件的损伤与渗碳动力学、应力以及其协同作用关系密切。本课题针对大型乙烯裂解炉关键构件-裂解炉管，综合运用金属学、固体力学、计算科学，结合数值模拟和试验测试等手段，开展多因素耦合作用下裂解炉管损伤机理与损伤演化的研究。通过建立渗碳扩散模型及其计算分析，研究温度、应力与金属构件渗碳动力学之间的定量关系；揭示乙烯裂解炉管结构应力、应变变化和应力－渗碳协同作用的损伤机理；发展蠕变和渗碳耦合作用下的宏观、细观损伤发展计算方法，演绎高温服役环境和复杂载荷作用影响下的材料损伤演化过程，为大型乙烯裂解炉炉管寿命预测提供理论基础和科学方法。

中文关键词： 损伤机理；乙烯裂解炉；渗碳；蠕变；多因素耦合

英文摘要： Research on damage mechanism and damage evolution of core component of large-scale ethylene cracking furnace is a multi-level and multi-scale problem, which is involved with metallography, mechanics, mechanology and computational science. Damage of the structure component is close relationship with carburization dynamics, stress. this study focus on the damage mechanism analysis and life prediction of cracking furnace tube, as the core component of large-scale ethylene cracking furnace, with coupled multi-factor effects based on the theory of metallography, solid mechanics and computational science, numerical simulation and experimental tests are combined to study. Quantitative relation between temperature, stress and carburization dynamics was investigated by establishing mathematical model of carburization diffusion. Damage mechanism of ethylene cracking furnace tube was revealed under structure stress, strain variation as well as combined stress with carburization.Proposing macroscopical and microscopical damage analysis method under action of creep and carburization, deducing damage evolution of struture component at high temperature and complex stress, relizing damage evolution of ethylene cracking furnace tube under the coupled multi-factor effects is an imminent research study, which should propose the t

英文关键词： Damage mechanism；ethylene cracking furnace；carburization;；creep；coupled multi-factors