Investigation of NOx emission under different burner structures with the optimized combustion model
Investigation of NOx emission under different burner structures with the optimized combustion model
复制标题
采用优化燃烧模型研究不同燃烧器结构下NOx排放
DOI：
10.1016/j.neucom.2021.11.051
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发表时间：
2021-11
期刊：
影响因子：
6
通讯作者：
Wenli Du
中科院分区：
文献类型：
--
作者：
Qian Yao;Yu Zhang;Xinjie Wang;Zhou Tian;Guihua Hu;Wenli Du
随着对NOx（氮氧化物）排放的限制变得越来越严格，已经在NOx控制策略的开发上投入了许多努力。加热炉燃烧器结构通过改变火焰温度影响NOx的生成。为了模拟湍流燃烧过程，采用了定常扩散小火焰（SDF）模型，并结合了详细的机理。研究发现，SDF模型中的一些关键火焰面参数对模拟结果的准确性有很大的影响。在这项研究中，提出了一个有效的优化过程中优化燃烧模型参数与代理辅助进化算法K-RVEA。代理模型用于减少优化过程的计算时间。采用优化后的模型参数，模拟得到的温度场和浓度场与实测值吻合较好。在此基础上，研究了导流壁和射流壁长度对NOx排放的影响。结果表明，当导流壁和射流壁长度相等时，出口NOx浓度达到局部极小值。当增加导向壁的长度时出口NOx浓度增加的单调增加间隔的长度为30 mm。如果导向壁的长度比射流壁的长度相对长30 mm，则出口NOx浓度将进一步降低。所提出的优化方法及所得结果对加热炉燃烧器结构的改进具有一定的指导意义。
As restrictions on NOx (nitrogen oxides) emission become increasingly stringent, many efforts have been put into the development of NOx control strategies. The burner structures of the heating furnace can affect NOx formation by the means of changing the flame temperature. To simulate the turbulent combustion process, the Steady Diffusion Flamelet (SDF) model is used and coupled with detailed mechanisms. It is found that some key flamelet parameters of the SDF model will greatly affect the accuracy of the simulation results. In this study, an efficient optimization procedure is proposed to optimize the combustion model parameters with the surrogate assisted evolutionary algorithm K-RVEA. The surrogate model is used to reduce the computational time of the optimization procedure. Using the optimized model parameters, the temperature field and the concentration fields obtained by the simulations are in good agreement with the measurements. Based on this, the investigation of the impact of the length of pilot wall and jet wall on NOx emission is carried out. The results show that the outlet NOx concentration reaches a local minimal value when the length of pilot wall and jet wall are equal. The length of monotonic increasing interval, where the outlet NOx concentration increases when increasing the length of the pilot wall, is 30 mm. If the length of pilot wall is relatively 30 mm longer than that of the jet wall, the outlet NOx concentration will be further reduced. The proposed optimization procedure and obtained results will benefit the improvement of the burner structure of the heating furnace.
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