摘要
加氢反应器在服役过程中会受到高温高压和循环载荷的共同作用,设计时必须同时考虑蠕变和疲劳的影响。ASME规范案例2605提供一种针对2.25Cr1MoV钢的蠕变疲劳寿命设计方法。借助有限元分析软件ANSYS,采用案例2605中的方法对加氢反应设备圆柱筒体直接管结构进行蠕变疲劳寿命校核,详细阐述该案例的设计思想和具体步骤,并讨论操作温度和压力对于设计寿命的影响。结果表明,接管结构蠕变疲劳寿命校核满足要求,筒体与直接管连接处出现应力集中,由于蠕变应变的产生,应力集中处的应力值随蠕变时间的增加不断下降,蠕变损伤累积速度也随之下降。同时,提高操作温度和操作压力均会造成蠕变损伤的增加,疲劳应力幅对蠕变疲劳的寿命影响较大。针对模拟结果,提出一些提高结构蠕变疲劳寿命的措施。
Hydrogenation reactor suffers from a combination of high temperature, high pressure and cyclic load in the process of service, and the effects of creep and fatigue must be taken into account in design. ASME code case 2605 provides a creep fatigue life design method for hydrogenation equipment made of 2.25Cr1MoV steel. With the aid of finite element analysis software ANSYS, a design example of the joint of cylinder and nozzle is introduced to elaborate the design idea and method of the case, and the effects of operating temperature and pressure on the design life are discussed. The results show that creep fatigue damage evaluation meets the safety requirements, and the joint of cylinder and nozzle appears stress concentration. Due to creep strain, the stress value and the rate of creep damage accumulation decrease with the increase of creep time. At the same time, the creep damage increases with the increase of operating temperature and pressure. In addition, the fatigue stress amplitude has greater influence on the life of structure. According to the results, some improvements on creep fatigue life of structure are proposed.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2015年第6期51-57,共7页
Journal of Mechanical Engineering
基金
国家自然科学基金资助项目(51435012)
