多层包扎尿素合成塔应力状况分析

对层板之间存在间隙的尿素合成塔应力状况进行计算,模拟实际运行条件,并进行有限元分析。结果表明,深环焊缝内侧层板间隙部位存在很大应力集中,局部已发生屈服,是尿素合成塔最危险的部位,并且计算结果与尿素合成塔实际开裂形式相吻合,文中指出Lame公式已经不再适合存在间隙的多层包扎尿素合成塔设计。进行尿素合成塔设计时,必须考虑深环焊缝部位的应力集中对整体强度的影响。

预加氢反应器裂纹成因和安全评定

In this paper the inspection results of pre-hydrogenation reactor are presented and some problems such as stress corrosion cracks and corrosion holes are analyzed and discussed. A proposal concerning safety in use is also put forward.