加氢反应器T接管结构优化

Structure optimization of T-nozzle in hydrogenated reactor

T接管是加氢反应器氢气和蒸气混合气的进口,裂纹出现较多,焊接残余应力是主要原因之一.利用有限元法,对加氢反应器T接管与球形封头焊接残余应力进行计算分析.从焊接残余应力的角度,优化了T接管的连接方式.结果表明,当T接管轴线沿球形封头半径方向时,在T接管内壁以及焊缝根部,产生了较大的残余应力,对应力腐蚀开裂影响很大.因此,在T接管内部插入一个翻边,可以将焊接残余应力与介质有效隔离,防止应力腐蚀开裂.研究结果为加氢反应器T接管的裂纹治理、结构优化提供了参考依据.

T-nozzle is the inlet of the mixture gas of hydrogen and steam in a hydrogenated reactor.Many cracks have been generated in T-nozzle,which are caused mainly by the welding residual stresses.Finite element method is used to study the welding residual stress in T-nozzle of hydrogenated reactor.Based on considerations of residual stress,the welding structure of T-nozzle is optimized.The axial of T-nozzle is welded in the direction of head radius,through which the stress concentration is decreased.Large residual stresses are generated in the internal surface of nozzle and head,which have great effect on stress corrosion cracking.A flanging is inserted into the nozzle to isolate the residual stress from the mediums,which can prevent the stress corrosion cracking.It can be a reference for crack treatment and structure optimization of T-nozzle for hydrogenated reactor.