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以大型制氢转化炉入口集合管为研究对象,从其受力变形分析入手,对其三通开裂原因进行了分析。通过对工作状态下入口总管与支管垂直方向位移的测量,发现二者垂直位移最大差值达到40 mm,且水平方向各支管位移差值达到25 mm,使得三通位置承受弯扭组合状态,是引起该位置产生应力集中并导致开裂的重要原因。采用有限元计算方法,分别通过增设入口集合管悬吊装置和三通保护器的方法,降低了开裂位置处的应力集中,最大等效应力可降低40%以上。有效改善了入口集合管位置处的受力状态,改造后可安全工作。
Taking the inlet manifold of large-scale hydrogen conversion reactor as the research object, starting from the analysis of its stress and deformation, the cracking reason of the tee is analyzed. Through the measurement of vertical displacements of inlet manifold and branch pipe under working condition, it is found that the maximum vertical displacement difference between them reaches 40 mm and the horizontal displacement difference of each branch pipe reaches 25 mm, which makes the three-way position bear the combination of bending and torsion. Causing the location of the stress concentration and lead to cracking an important reason. Finite element method is adopted to reduce the stress concentration at the crack location by adding the inlet manifold suspension device and the three-way protector, respectively. The maximum equivalent stress can be reduced by more than 40%. Effectively improve the inlet manifold position at the state of stress, after the transformation can work safely.