【摘要】 为提高某型余热锅炉的换热效率，设计了一种前置导流结构，并研究了其前置工业补燃燃烧器工作时的强度问题。根据计算流体动力学的流场迭代仿真结果调整了燃烧器导流板仰角，得到了符合流场一致性和流动均匀性要求的导流设计，再利用自主开发的MATLAB程序算法将温度场映射到有限元分析模型，并使用HyperMesh-ABAQUS联合仿真对组件进行了常温静力及热力耦合分析，校核了导流板在不同工况下的结构强度。为使模拟更加精确，根据材料性质随温度改变的情况对模型材料参数进行了相应调整。分析表明：在导流结构满足将流场均匀输出的前提下，设计的结构在自重分析下满足强度准则，等效应力远低于结构材料屈服强度；而在高温热冲击下，计算结构的局部应力水平趋近于材料屈服强度，针对该现象从几何设计和材料选择两方面给出了优化意见。整个分析过程全面考虑了导流板在常温、热态使用条件下的强度表现，并给出了结构调整带来的应力下降幅度，为基于使用状态的补燃燃烧器导流板优化设计提供了标准化参考流程。更多还原

【Abstract】 In order to improve the heat transfer efficiency of a heat recovery steam generator, the strength of a pre-positioned supplementary combustion burner is studied in this paper.Based on iterative flow field CFD simulations, the exit angles of each burner deflector is optimized, and a design that meets the requirements of flow field consistency and uniformity is obtained.Then, the temperature field is mapped to the finite element analysis model by an in-house MATLAB code, and the cold-state static and high-temperature thermal-mechanical analysis of the component is carried out by using HyperMesh and ABAQUS,and the structural strength of the deflectors under different working conditions is evaluated.In order to make the simulation more accurate, the temperature-dependent material properties are taken into account.The analysis shows that on the premise that the deflectors can assure the flow uniformity, the structure can meet the strength criterion under the cold-state self-weight analysis, and the stress level is far lower than the yield strength of the material; under high-temperature thermal-mechanical load, the local stress level is slightly higher than the material’s yield strength.To resolve this issue, suggestions from two aspects, namely geometric design and material selection, are provided.The whole analysis process comprehensively considers the strength performance of the deflectors under cold and hot service conditions, and gives the stress reduction range caused by geometric adjustment, which provides a standardized process for the optimal design of the deflector of supplementary combustion burner under different service conditions.更多还原