加氢反应器焊后局部热处理过程数值模拟与工艺优化

Numerical simulation and optimization of post-weld local heat treatment process of hydrogenation reactor

利用有限元软件MSC.Marc建立了加氢反应器焊后局部热处理过程的热力耦合有限元模型,并利用软件的二次开发功能把蠕变变形耦合到有限元模型当中。通过以上模型实现了对加氢反应器焊后局部热处理过程的数值模拟。模拟得到了反应器焊缝附近在不同热处理阶段的温度场、应变场和畸变场。为了减小反应器热处理后的畸变量,本文提出了优化的热处理工艺。与原始工艺相比,新工艺使反应器的畸变量从-2.31 mm减小为-1.86 mm。

A thermo-mechanical coupled finite element model for post-weld local heat treatment of hydrogenation reactor was developed by means of FE software MSC. Marc. Creep strain was considered by the subroutine and the heat treatment process was simulated. The temperature field, strain field and distortion field around the weld of hydrogenation reactor during different times were obtained. An optimized heat treatment process which can decrease the distortion of hydrogenation reactor after heat treatment was put forward. Using the optimized heat treatment process, the distortion can be controlled from -2.31 mm to -1. 86 mm.