Abstract NOx emission has noticeably hindered cement industry from developing sustainably. A novel fuel pretreatment is developed to lower NOx emission. Besides, a pilot scale experimental facility was used to investigate differences between the fuel pretreatment and that of traditional low-nitrogen combustion with two different size ranges of coal (0–0.18 mm and 0.1–0.5 mm). The results shown that NOx emission attributed to fuel pretreatment is 40–45% lower than that of traditional low-nitrogen combustion with both size ranges of coal. Fuel pretreatment can maximally cut NOx emission as follows: partial fuel-N is reduced in situ to stable N2 at the preprocessing stage, thereby lowering the possibility of fuel-N oxidation in the precalciner; compared with parent coal, the reducing capacity of preprocessing product is enhanced for its larger specific surface area and lower graphitized degree in carbonaceous framework. Furthermore, particle size distribution could significantly influence above process. It is therefore revealed that the proposed approach more applies to NOx emission control in practical cement manufacture.

中文翻译：

---

一种水泥窑脱硝的热化学燃料预处理工艺

摘要 NOx 排放严重阻碍了水泥工业的可持续发展。开发了一种新型燃料预处理以降低 NOx 排放。此外，中试规模的实验设备用于研究燃料预​​处理与传统低氮燃烧与两种不同尺寸范围的煤（0-0.18 毫米和 0.1-0.5 毫米）之间的差异。结果表明，燃料预处理产生的 NOx 排放比传统的低氮燃烧低 40-45%，两种尺寸范围的煤。燃料预处理可以最大限度地减少NOx排放：在预处理阶段将部分燃料-N原位还原成稳定的N2，从而降低在预分解炉中燃料-N氧化的可能性；与母煤相比，预处理产物的还原能力由于其较大的比表面积和较低的碳质骨架石墨化程度而增强。此外，粒度分布会显着影响上述过程。因此表明，所提出的方法更适用于实际水泥制造中的氮氧化物排放控制。