Leakage failure of a stainless steel spiral plate condenser
Leakage failure of a stainless steel spiral plate condenser
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DOI：
10.1016/j.engfailanal.2021.105921
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发表时间：
2021-12-22
影响因子：
4
通讯作者：
Wu, Chi-Man Lawrence
中科院分区：
文献类型：
--
作者：
Xu, Na;Ding, Ning;Wu, Chi-Man Lawrence
冷凝器是化工生产中不可缺少的基础设备。由于冷凝器工作条件复杂，泄漏失效事故时有发生。本文对304不锈钢螺旋板式冷凝器的泄漏故障进行了研究。故障的冷凝器只运行了6个月，是用来通过循环冷冻盐水冷凝异丙胺的。在切断和打开冷凝器后，发现在间隔柱和与冷冻盐水接触的不锈钢螺旋板之间的焊接连接处附近出现了许多泄漏点。结果表明，凝汽器泄漏是由于氯离子在间隔柱与不锈钢螺旋板的焊接连接处引起的点蚀引起的。焊接区不锈钢的敏化加剧了点蚀的危险。间隔柱焊接区存在焊接裂纹和夹渣等焊接缺陷，这些缺陷也可能加剧焊接区腐蚀的发展。
The condenser is an indispensable basic equipment in chemical industry. Due to the complex working conditions, leakage failure accidents often occur for condensers. In this work, the leakage failure of a spiral plate condenser made of 304 stainless steel has been investigated. The failed condenser, which had serviced for just six months, was used to condense isopropylamine by circulating frozen brine. After cutting and opening the condenser, numbers of leakage points were found occurring near the welding joints between the spacing columns and stainless steel spiral plates contacting with the frozen brine. The evidences indicate that leakage of the condenser is due to pitting corrosion caused by chloride ions near the welding joints between the spacing columns and stainless steel spiral plates. The sensitization of stainless steel in the welding zone intensifies the risk of pitting corrosion. Welding defects, including welding cracks and slag inclusions, are observed in the welding zone of the spacing columns, which might also aggravate the development of corrosion in the welding zone.