Analysis and Repair of Cracks in the Cracking Furnace of Ammonia Decomposition Unit

ZHANG Peng; FU Yichuan; ZHAO Zhenxu; QU Haidong; LIU Jie; LIANG Yan; YE Weicai

doi:10.7512/j.issn.1001-2303.2023.10.12

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Analysis and Repair of Cracks in the Cracking Furnace of Ammonia Decomposition Unit
Vol. 53, Issue 10, Pages: 78-83(2023)
DOI： 10.7512/j.issn.1001-2303.2023.10.12

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张鹏，付一川，赵振旭，等.裂解炉炉胆焊缝裂纹原因分析及焊接修复［J］.电焊机，2023，53（10）：78-83.

ZHANG Peng, FU Yichuan, ZHAO Zhenxu, et al.Analysis and Repair of Cracks in the Cracking Furnace of Ammonia Decomposition Unit[J].Electric Welding Machine, 2023, 53(10): 78-83.
张鹏，付一川，赵振旭，等.裂解炉炉胆焊缝裂纹原因分析及焊接修复［J］.电焊机，2023，53（10）：78-83. DOI： 10.7512/j.issn.1001-2303.2023.10.12.

ZHANG Peng, FU Yichuan, ZHAO Zhenxu, et al.Analysis and Repair of Cracks in the Cracking Furnace of Ammonia Decomposition Unit[J].Electric Welding Machine, 2023, 53(10): 78-83. DOI： 10.7512/j.issn.1001-2303.2023.10.12.

摘要

氨分解装置裂解炉炉胆为耐热不锈钢焊接制造，局部焊接接头在长期高温运行过程中产生裂纹。为保证耐热不锈钢炉胆的安全生产，分析炉胆裂纹的产生原因为S31008奥氏体不锈钢在长时间高温运行中沿晶界连续析出网状脆性Cr,23,C,6,碳化物，在工作应力作用下裂纹沿晶界扩展，造成沿晶界断裂。此外，裂解炉运行温度以及椭圆形封头与中间接管、中间接管与管束的尺寸不一致引起应力集中，造成无法同步收缩，从而形成残余拉应力。采用ER310焊丝和钨极氩弧焊进行焊接修复，选用合理的焊接工艺能够获得奥氏体+铁素体的焊缝组织，既可以提高金属的抗裂性能，又不降低焊缝金属的高温性能，焊缝无损检测后发现焊缝与母材熔合线清晰规则，熔合情况良好，修复后的炉胆能够达到正常使用要求。

Abstract

A furnace of cracking furnace of ammonia decomposition unit is made of heat-resistant stainless steel-welded, and the partial welded joint cracks in the process of long-term high-temperature operation. In order to ensure the safe production of heat-resistant stainless steel furnace liner, the reason for the occurrence of furnace liner cracks is that S31008 austenitic stainless steel continuously precipitates a network of brittle Cr,23,C,6, carbides along the grain boundary during long-term high-temperature operation. Under the action of working stress, the cracks propagate along the grain boundary, causing fracture along the grain boundary. In addition, the operating temperature of the cracking furnace and the inconsistency in the dimensions of the elliptical head and intermediate nozzle, as well as the intermediate nozzle and tube bundle, cause stress concentration and prevent synchronous shrinkage, resulting in residual tensile stress. Using ER310 welding wire and tungsten argon arc welding for welding repair. After the non-destructive testing of the weld, it was found that the fusion line between the weld and the base metal was clear and regular, the fusion was good, and the furnace liner after welding repair could meet the requirements of normal use.

关键词

耐热不锈钢焊缝裂纹晶间腐蚀焊接修复

Keywords

heat-resistant stainless steelweld crackintergranular corrosionwelding repair

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