Upon the background of China's dual-carbon energy and environment strategies and the requirements of green and sustainable development in the new era, how to gradually reduce coal consumption while at the same time enhance the efficient and clean use of coal and reduce pollutant emissions is attracting more and more attention. For a 600-MWe arch-fired furnace facing persistent challenges of high NO x output and an overheating risk in hopper as firing anthracite, a cascade-arched low-NO x and high-efficiency configuration (CLHC) was taken as an alternative to the existing multiple-injection and multiple-staging combustion technique (i.e., the MIMSCT, denoted as the reference furnace or technique in this study). In particular, along the furnace height the CLHC's overfire air (OFA) position in the burnout zone has an important influence on the low-NO x performance due to the shrunk furnace-arch space and a short upper furnace. Aiming at evaluating the OFA-location effect and confirming the CLHC in resolving the above problems, industrial-scale experiments and modeling were performed in the reference furnace and thereafter, the low-NO x characteristics with the CLHC was simulated considering three different OFA locations of the upper-furnace OFA, throat OFA, and arch OFA. In the OFA-location elevated order, the blending position of OFA and the main upward gas first lowered and then elevated, while the OFA penetration, overall combustion performance, and major low-NO x accomplishment indexes related to NO x yield and burnout loss initially improved but then deteriorated. As a result, the medium throat OFA presented the optimal low-NO x merit among the three setups, with the unburnt combustible of 5.3% in fly ash alongside NO x yield of 660 mg/m3 (O2 = 6%), respectively. By comparison to the reference technique, the CLHC gained a 30% NO x reduction ratio without affecting burnout and greatly relieved the hopper overheating issue via reducing sharply its temperatures by 400 K, thereby confirming the CLHC's viability. This study provided guidance on the safe furnace operations and reduction of pollutant emissions, benefiting the efficient and environmentally friendly usage of low-quality coals in industrial-scale furnaces.

中文翻译：

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通过喉部过火空气增强拱形燃烧的低氮氧化物性能，以降低氮氧化物和料斗过热

在我国能源环境双碳战略和新时代绿色可持续发展要求的背景下，如何在逐步降低煤炭消费的同时，提高煤炭高效清洁利用、减少污染物排放，备受关注。越来越受到关注。对于 600 兆瓦e拱火炉面临高NOx持续挑战X燃烧无烟煤（一种梯级拱形低 NO）时，料斗中的产量和过热风险X高效配置（CLHC）被用作现有多次喷射和多级燃烧技术（即MIMSCT，在本研究中表示为参考炉或技术）的替代方案。特别是，沿着炉高，CLHC 在燃尽区的过火空气 (OFA) 位置对低 NO 产生重要影响。X由于炉拱空间缩小和上炉较短而提高了性能。为了评估OFA定位效果并确认CLHC解决上述问题，在参考炉中进行了工业规模的实验和建模，随后，低NOX考虑上炉 OFA、喉部 OFA 和拱部 OFA 三个不同的 OFA 位置，对 CLHC 的特性进行了模拟。在OFA位置升高顺序中，OFA与主要向上燃气的混合位置先降低后升高，而OFA穿透度、整体燃烧性能和主要低NOX与NO相关的成就指数X产量和燃尽损失最初有所改善，但随后又恶化。因此，中喉 OFA 呈现出最佳的低 NOX三种设置中的优点是，飞灰中未燃烧的可燃物含量为 5.3%，NO 旁边X产量 660 毫克/立方米3（O2= 6%），分别。与参考技术相比，CLHC 获得了 30% 的 NOX在不影响燃尽的情况下降低了减速比，并通过将料斗温度急剧降低 400 K 大大缓解了料斗过热问题，从而证实了 CLHC 的可行性。该研究为熔炉安全运行和减少污染物排放提供了指导，有利于工业规模熔炉中劣质煤炭的高效、环保利用。