Preheating of pulverized coal (PC) has previously been verified as an effective method for reducing NO emission during coal combustion. However, studies on NO formation and destruction characteristics related to the combustion of high-temperature preheated PC are rare. In this study, two drop tube furnaces were connected in series to model the preheating-combustion process, and the effect of combustion temperature on NO emission during the oxidation of high-temperature preheated PC was studied in detail through experiment and kinetic modeling. Results confirmed the effectiveness of preheating on NO reduction with a maximum efficiency as high as 71.73%. Results also indicated that increasing the combustion temperature promoted both the formation and destruction of NO, while the increase in the NO formation rate was steeper than its destruction. This led to an increase in NO from 223 to 273 mg·m⁻³ as the combustion temperature increasing from 1273 K to 1473 K at preheating temperature of 1673 K. In addition, the rate of production (ROP) of NO formation increased from 8.54E-9 to 3.49E-7 mol·cm⁻³·s⁻¹ with an elevated temperature from 1073 K to 1873 K, whereas the rate of NO destruction increased only from 1.40E-9 to 7.45E-8 mol·cm⁻³·s⁻¹. Finally, the ROP analysis also indicated that the presence of background NO posed heavy impact on conversion of char-N and significantly improved the NO destruction rate.

煤粉预热 (PC) 先前已被证实是减少煤燃烧过程中 NO 排放的有效方法。然而，关于与高温预热 PC 燃烧相关的 NO 形成和破坏特性的研究很少。在本研究中，将两台管式炉串联连接以模拟预热-燃烧过程，并通过实验和动力学建模详细研究了燃烧温度对高温预热 PC 氧化过程中 NO 排放的影响。结果证实了预热对 NO 还原的有效性，最高效率高达 71.73%。结果还表明，提高燃烧温度促进了 NO 的形成和破坏，而 NO 形成速率的增加比其破坏更陡峭。^-3随着燃烧温度从 1273 K 增加到 1473 K，预热温度为 1673 K。此外，NO 生成速率 (ROP) 从 8.54E-9 增加到 3.49E-7 mol·cm ^-3 · s ^-1的温度从 1073 K 升高到 1873 K，而 NO 的破坏率仅从 1.40E-9 增加到 7.45E-8 mol·cm ^-3 ·s ^-1。最后，ROP 分析还表明，背景 NO 的存在对炭-N 的转化产生了严重影响，并显着提高了 NO 的破坏率。