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Optimization of Operating Parameters for Low NO_x Emission in High-Temperature Air Combustion

机译：高温空气燃烧中低NO_x排放的运行参数的优化

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摘要

This paper focuses on determining the effects of operating parameters on NO_x emission and parameters optimization to reduce NO_x emission for high-temperature air combustion furnaces. For this purpose, the Taguchi method, based on computational fluid dynamics (CFD) modeling, was implemented. Eight factors were considered, including the velocity of air injection (A), the velocity of fuel injection (B), the oxygen concentration in preheated air (C), the preheated air temperature (D), fuel temperature (E), the interaction between A and B, the interaction between A and C, and the interaction between A and D. An L_(27) (3~(13)) orthogonal array was employed to arrange the CFD modeling tests. By analysis of variance, the degrees of effect of the selected factors are determined, which are as follows, in descending order: E, B, C, A, D, AB, AC, and AD. The major factors are found to be A, B, C, and E, while the other factors are considered to be secondary factors. The optimal operating conditions are determined to be A = 120 m/s, B = 85 m/s, C = 18.5%, D = 1493 K, and E = 298 K. Under the optimal operating condition, the concentration of NO_x emission decreases by 25.45%, compared with the original operating condition.
机译：本文着重于确定操作参数对NO_x排放的影响，并进行参数优化以减少高温空气燃烧炉的NO_x排放。为此，实施了基于计算流体动力学（CFD）建模的Taguchi方法。考虑了八个因素，包括空气喷射速度（A），燃料喷射速度（B），预热空气中的氧气浓度（C），预热空气温度（D），燃料温度（E），相互作用A和B之间的相互作用，A和C之间的相互作用以及A和D之间的相互作用。采用L_（27）（3〜（13））正交阵列布置CFD建模测试。通过方差分析，确定选定因素的影响程度，按降序确定如下：E，B，C，A，D，AB，AC和AD。发现主要因素是A，B，C和E，而其他因素被认为是次要因素。确定最佳操作条件为A = 120 m / s，B = 85 m / s，C = 18.5％，D = 1493 K和E = 298K。在最佳操作条件下，NO_x排放浓度降低与原始操作条件相比降低了25.45％。

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