蒸汽管道温度异常波动的寿命损伤分析  

Analysis on Service Life Loss of Steam Pipes Caused by Abnormal Temperature Fluctuations

作　　者：康朝阳[1] 毛荷芳[1] 陈玮[1] 

机构地区：[1]上海发电设备成套设计研究院,上海200240

出　　处：《发电设备》2015年第2期93-95,101,共4页Power Equipment

摘　　要：通过对主蒸汽管道温度异常波动的机理进行理论分析,得出主蒸汽管道温度剧降是管道中心蒸汽与管壁水热交换产生的结果。借助ANSYS软件,对发生温度异常部位的主蒸汽管道直管和弯头进行温度场分析、热应力分析、内压应力分析,详细计算温度异常剧降产生的内外管壁温差幅度以及应力变化情况,然后根据ASME规范对主蒸汽管道进行寿命损耗计算以及安全评估,表明主蒸汽管道的直管计算损伤率最大值为0.020%,弯头计算损伤率最大值为0.019%。By theoretical analysis on the mechanism of abnormal temperature fluctuations in steam pipe,the sharp temperature fall is found to be caused by heat exchange between the steam in pipe and the water on pipe wall.With the aid of software ANSYS,researches were conducted to the straight pipe and elbow where sharp temperature fall occurred,such as temperature field analysis,thermal stress analysis and internal pressure stress analysis,based on which calculations were carried out to the temperature difference between inner and outer surface of the pipe as well as to the stress changes.Comparison results between above calculations and ASME codes show that the maximum life loss rate of the straight pipe and elbow are respectively 0.020% and 0.019%.

关 键 词：主蒸汽管道 弯头 应力 寿命 计算 

分 类 号：TK223.11[动力工程及工程热物理—动力机械及工程]