An improved high‐temperature flue gas combustion technology was developed and examined in this study. The high‐temperature flue gas generator generated a flow of flue gas at a high temperature (720°C) with low oxygen content (10%), which flowed into the main combustion zone and acted as the carrier gas for pulverized bituminous coal (0–0.355 mm) in the combustion chamber. In the combustion chamber, the coal particles reached a higher combustion temperature (>1,100°C) in a short time, and the temperature difference was within 230°C, which showed that the local oxidation zone had been avoided. Furthermore, air‐staging combustion technology was also adopted in combination with this technology. NO was the main nitrogen‐containing compound, and the concentrations of other nitrogen‐containing compounds (N₂O, NH₃, and HCN) were extremely low. The NO concentrations were reduced to 0 ppm twice when the volatiles released rapidly in the initial stage, and the volatiles burned violently in the intermediate stage, which are the main reasons for the significant reduction in NO_x emissions. The original emissions of NO_x were 187.2 mg/m³ (@6% O₂), and the conversion ratio of fuel‐nitrogen to NO_x was 16.6%. High‐temperature flue gas combustion technology has reached low‐NO_x combustion for pulverized coal.

中文翻译：

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高温烟气中粉煤燃烧的NOx排放

这项研究开发并检查了一种改进的高温烟气燃烧技术。高温烟气发生器产生的烟气在高温（720°C）且氧含量低（10％），并流入主燃烧区，并作为粉煤烟气的载气（0 –0.355毫米）。在燃烧室内，煤颗粒在短时间内达到较高的燃烧温度（> 1,100°C），并且温差在230°C以内，这表明已经避免了局部氧化区。此外，还采用了空气分段燃烧技术。NO是主要的含氮化合物，是其他含氮化合物（N ₂ O，NH₃和HCN）极低。的NO浓度减少至0ppm的两倍时在初始阶段快速释放的挥发物，挥发物在中间阶段剧烈燃烧，这是在没有还原显著的主要原因_X排放。NO _x的原始排放为187.2 mg / m ³（@ 6％O ₂），燃料氮转化为NO _x的转化率为16.6％。高温烟道气燃烧技术已达到低NO _X燃烧为粉煤。