裂解废热锅炉角焊缝裂纹产生原因及解决措施

Formation and Remediation of Cracks in the Angle Welding Joint of a Waste Heat Boiler of an Ethylene Plant

针对乙烯装置废热锅炉给水下集合管连接角焊缝产生穿透性裂纹的事故 ,分析其原因为焊接不良而产生碱腐蚀。解决措施为采用氩弧焊 ,改进焊接结构设计等。改造后的废热锅炉运行良好。

The cause for the crack appearing on the angle welding joint of the lower feed water collector of a waste heat boiler in an ethylene plant,leading to intrusion of high pressure boiler feed water into low pressure cracking gas,was found to be the result o f alkali corrosion due to improper welding.To solve the problem,the welding joint construction was re-designed and argon-arc welding was employed.The result has been satisfactory.