中文摘要：

针对浙江华能玉环电厂脱硝工程，应用有限元分析方法对烟道结构进行小变形弹性和大变形弹性模拟，对钢结构烟道在实际荷载作用下的力学性能进行了分析，探讨了烟道长度变化对烟道结构应力和变形的影响．考虑大变形影响时，烟道的应力分布均匀，其应力值较不考虑大变形的应力值小5％-50％，烟道长度的变化对应力值的影响不超过20％．结合现场监测验证了数值模拟的可靠性．

英文摘要：

A denitration project in Zhejiang Huaneng Yuhuan Power Plant in China was taken as the research object, and the finite element method was used to simulate elastic properties in small deformation and large deformation. The mechanical properties of the flue in practical load were studied, and the influence of the flue length on the stress and deformation were discussed. It is found that because of considering large deformation effect, the equivalent stress of the flue is well-distributed, and its values decrease by 5% to 50% The influence of the change in flue length on the stress is less than 20%. At last, monitoring was used to show the reliability of numerical simulation.