论文部分内容阅读
通过对实际进行中的裂解反应管的解剖分析和模似实验,探讨了反应管的损伤型式和损伤原因。提出渗碳和热疲劳的联合作用是引起反应管内壁开裂的主要原因。渗碳层中奥氏体基体Cr 含量显著下降,引起耐热钢抗氧化能力下降,从而造成管内壁粉化,在反应介质的冲刷下,管壁减薄乃至穿孔。由于厚壁弯管常处于炉膛边缘,对炉温变化较敏感,因此易于遭受热疲劳损伤。
By analyzing the anatomical analysis and simulation experiment of the actual cracking reaction tube, the damage type and damage reason of the reaction tube were discussed. It is proposed that the combined effect of carburizing and thermal fatigue is the main reason that causes the inner wall of the reaction tube to crack. The Cr content of the austenite matrix in the carburized layer significantly decreases, causing the oxidation resistance of the heat-resistant steel to decline, resulting in the powdering of the inner wall of the tube. The wall of the tube is thinned and even perforated by the reaction medium. Thick-walled bends are often at the edge of the furnace and are more susceptible to changes in furnace temperature and are therefore susceptible to thermal fatigue damage.