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中文摘要：
以某火力发电厂肋式烟气脱硝反应器为工程背景，以有限元分析软件ANSYS为手段，建立了空间有限元模型，系统的研究了反应器在负压作用下的屈曲模态和屈曲承载力，进而对影响反应器壳体稳定性的几种因素进行了探讨，并将提高反应器稳定性的几种措施进行了对比．结果表明：采用的薄板加强肋方案有效可行，负压作用下稳定性良好；布置加强肋、减小加强肋布置间距、增加壁板厚度和加宽立柱翼缘宽度都可以提高壳体的稳定性，但提高的效率差别较大，设置间距较小的加强肋是提高壳体稳定性最有效的方法．
英文摘要：
Based on the engineering background of a denitrification reactor in coal fired plants, and by means of finite element analysis software ANSYS, the spatial finite element analysis model is established. The buckling mode and buckling bearing capacity of reactor under negative pressure is systematically studied, then several fac- tors to the stability of the reactor shell are discussed, and several measures to improve the stability of the reactor shell were compared. The result shows that the strengthening rib plate used in this structure is effective and feasi- ble and has good stability under negative pressure. Arranging of stiffening rib, reducing the spacing of strengthe- ning rib, increasing the thickness of the wall and widening the the column flange can improve the stability of the shell, but the efficiency of improving the shell stability varies. The setting of rib with smaller spacing turns out to be the most effective way .
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