摘要
结合某火电机组汽包管接头更换修复工程,用有限元计算与现场测量相结合的方法,对修复热处理温度场和焊后热处理工艺进行研究。结果表明,修复过程中汽包筒体存在周向、纵向和内外壁温差,汽包结构特点和热处理工艺是影响温度场的主要因素;空气自然对流冷却状态下,吊杆温度超过400℃。周向分区控温、在300和400℃设置保温段和以压缩空气对吊杆强制冷却等措施,有效地控制了汽包温差和吊杆温度,并在修复工程中得到了成功应用。
For repairing connection-tube sockets of the boiler drum in a power plant,heat treatment temperature field under welding repair and postweld heat treatment technology were investigated through both finite element calculation and in situ measurement.The results indicate that there are temperature difference around drum circumference,longitudinal and wall thickness direction respectively.Drum structural characterization and heat treatment process are main factors influencing temperature field.Moreover,the hanger′s temperature exceeds 400 ℃ under air natural convection.The methods of controlling drum temperature difference and hanger′s temperature are applied successfully in repair engineering,which include dividing several areas to control temperature around drum circumference,set holding temperature stage both at 300 and 400 ℃,forced cooling hangers to suitable temperature by compressed air,and so on.
出处
《金属热处理》
CAS
CSCD
北大核心
2010年第4期77-80,共4页
Heat Treatment of Metals
关键词
汽包
管接头
修复
热处理
温度场
boiler drum
connection-tube socket
repair
heat treatment
temperature field
