焦炭塔大角缝裂纹形成原因及修补  

CRACKING CAUSE OF FILLET WELD SEAM OF COKE TOWERS AND SOLUTIONS

作　　者：于威娜 郑平[2] 詹天屹 孙冰[1] 

机构地区：[1]中国石油天然气股份有限公司抚顺石化分公司,辽宁抚顺113001 [2]辽宁石油化工大学石油天然气工程学院,辽宁抚顺113001

出　　处：《石油化工设备技术》2018年第3期52-56,共5页Petrochemical Equipment Technology

基　　金：辽宁省教育厅科学研究一般项目"水平管气液两相分层流界面剪切改进模型预测研究"(L2016017);辽宁省自然科学基金项目"气液喷射器瞬态喷射性能的数值模拟及验证研究"(20170540591)

摘　　要：某石化公司240万t/a焦化联合装置内两台焦炭塔在运行过程中相继在大角缝处产生裂纹,造成装置分炉检修并低负荷运行.分析认为,操作温度的剧烈变化、大角缝的特殊位置和施工焊接质量都是产生裂纹的主要原因.为消除裂纹,针对主材14Cr1MoR的性质,选择牌号为R307BL焊条,在装置现场对焦炭塔进行了返修.通过补焊、消氢和焊后热处理等工序,裂纹得到有效修补.返修后装置运行良好,避免了装置停工造成的经济损失约5000万元.Cracking occurred successively at the corner seam of two coke towers of 2.4 mt/a coking complex unit in F ushun Petrochemical Company,which resulted in overhaul of the unit furnace and low-load operation. After analysis,it's considered that the main reasons for the cracking were the drastic change of operating temperature,the special position of the corner seam and the welding quality of the construction. In order to eliminate the cracking, R307 BL electrode was used to repair the coke tower according to the properties of the main material 14Cr1MoR.After welding,dehydrogenation and post-weld heat treatment, the cracking was effectively repaired and the unit has been in good operating state.The solutions have avoided economic loss of about 50 million RMB caused by shutdown of the coking complex unit.

关 键 词：焦炭塔 大角缝 裂纹 成因 返修 

分 类 号：TE962[石油与天然气工程—石油机械设备]