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Operational Characteristics Of A Parallel Jet Mild Combustion Burner System

机译：平行射流轻度燃烧燃烧器系统的运行特性

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摘要

This study describes the performance and stability characteristics of a parallel jet MILD (Moderate or Intense Low-oxygen Dilution) combustion burner system in a laboratory-scale furnace, in which the reactants and exhaust ports are all mounted on the same wall. Thermal field measurements are presented for cases with and without combustion air preheat, in addition to global temperature and emission measurements for a range of equivalence ratio, heat extraction, air preheat and fuel dilution levels. The present furnace/burner configuration proved to operate without the need for external air preheating, and achieved a high degree of temperature uniformity. Based on an analysis of the temperature distribution and emissions, PSR model predictions, and equilibrium calculations, the CO formation was found to be related to the mixing patterns and furnace temperature rather than reaction quenching by the heat exchanger. The critical equivalence ratio, or excess air level, which maintains low CO emissions is reported for different heat exchanger positions, and an optimum operating condition is identified. Results of CO and NO_x emissions, together with visual observations and a simplified two-dimensional analysis of the furnace aerodynamics, demonstrate that fuel jet momentum controls the stability of this multiple jet system. A stability diagram showing the threshold for stable operation is reported, which is not explained by previous stability criteria.
机译：这项研究描述了实验室规模炉中平行喷射MILD（中度或强烈低氧稀释）燃烧燃烧器系统的性能和稳定性特征，反应物和排气口均安装在同一壁上。除了对一系列当量比，热量提取，空气预热和燃料稀释水平的全局温度和排放测量外，还提供了有或没有燃烧空气预热情况下的热场测量结果。事实证明，当前的炉/燃烧器配置无需外部空气预热即可运行，并实现了高度的温度均匀性。基于对温度分布和排放的分析，PSR模型预测和平衡计算，发现CO的形成与混合方式和炉温有关，而不是与热交换器进行的反应淬火有关。对于不同的热交换器位置，报告了维持低CO排放的临界当量比或过量空气水平，并确定了最佳运行条件。 CO和NO_x排放的结果，以及目视观察和对炉内空气动力学的简化二维分析，表明燃料喷射动量控制着该多喷系统的稳定性。报告了显示稳定操作阈值的稳定性图，以前的稳定性标准未对此进行说明。

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