乙烯裂解炉原料预热管线焊接接头开裂原因分析

Analysis of the causes of cracking of welded joints of raw material preheating pipelines of ethylene cracking furnace

摘要

本文针对乙烯裂解炉原料预热管线焊接接头的开裂原因进行了深入分析。首先，介绍了预热管线焊接的特点，包括管线材料的特性和焊接要求，分析了焊接过程中可能出现的问题。然后，探讨了焊接接头开裂的主要因素，包括机械应力、高温环境与介质腐蚀的作用，以及焊接缺陷对裂纹萌生的影响。最后，结合乙烯裂解炉原料预热管线的实际工况，详细分析了焊接接头开裂的原因，重点讨论了温度波动、残余应力、金相组织变化、焊接工艺控制不足等因素对焊接接头开裂的影响。

Abstract

This article provides an in-depth analysis of the causes of cracking in the welding joints of the preheating pipeline for ethylene cracking furnace raw materials. Firstly, the characteristics of preheating pipeline welding were introduced, including the properties of pipeline materials and welding requirements, and the possible problems that may occur during the welding process were analyzed. Then, the main factors causing cracking in welded joints were discussed, including mechanical stress, the effects of high temperature environment and medium corrosion, as well as the influence of welding defects on crack initiation. Finally, based on the actual working conditions of the preheating pipeline for ethylene cracking furnace raw materials, the causes of welding joint cracking were analyzed in detail, with a focus on discussing the effects of temperature fluctuations, residual stresses, changes in metallographic structure, and insufficient welding process control on welding joint cracking.

关键词

乙烯裂解炉 / 预热管线 / 焊接接头 / 开裂原因 / 残余应力

Key words

ethylene cracking furnace / preheating pipelines / welded joints / causes of cracking / Residual stress

参考文献

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[3] 张磊, 赵辉. 乙烯裂解炉焊接接头裂纹分析及其控制措施[J]. 石油炼制与化工, 2021, 50(02): 45-49.