论文部分内容阅读
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。
Combined with the replacement repair project of the steam pipe unit of a thermal power unit, the temperature field after heat treatment and the post-weld heat treatment process are studied by means of the combination of finite element calculation and field measurement. The results show that the temperature difference between the circumferential direction, the inner wall and the outer wall exists in the drum during the repair process. The characteristics of the drum and the heat treatment process are the main factors that affect the temperature field. The temperature of the boom exceeds 400 ℃ under natural convection cooling. Circumferential zone temperature control, set the insulation section at 300 and 400 ℃ and compressed air forced cooling of the boom and other measures to effectively control the drum temperature and boom temperature, and in the repair project has been successfully applied.