Coal sludge is a seriously polluted solid waste, and the rational utilization of its resources has long being an undoubtedly important research topic. This paper mainly studies the coal sludge partial preheating characteristic, combustion characteristic and the process of migration and conversion of nitrogen with preheating combustion technology. The experimental results indicate that most of the elements in the coal sludge are released during preheating, and the ratio of the fuel-N converted to the N₂, NH₃ and HCN are 75.5%, 6.74% and 0.64%, respectively. Compared with the coal sludge, the BET surface area and cumulative pore area of preheated char are increased. The surface of preheated char is loose and porous with many fine particles, while raw coal is dense with larger particles. Meantime, the quantity of carbon defect structure, the active sites and the reactivity of preheated char are all increased. In the whole process, the NO_x emission is about 156 mg/m³ (@6% O₂), the ratio of fuel-N converted to NO_x was 2.98%, and the combustion efficiency is 96.5%. This experiment results will play a vital role in efficient and clean utilization of coal sludge.

煤泥是一种严重污染的固体废物，其资源的合理利用长期以来无疑是一个重要的研究课题。本文主要研究煤泥部分预热特性、燃烧特性以及采用预热燃烧技术的氮迁移转化过程。实验结果表明，煤泥中的大部分元素在预热过程中被释放，燃料-N转化为N ₂、NH ₃的比例和 HCN 分别为 75.5%、6.74% 和 0.64%。与煤泥相比，预热后的炭的BET表面积和累积孔隙面积都有所增加。预热后的炭表面疏松多孔，有许多细小颗粒，而原煤致密，颗粒较大。同时，碳缺陷结构的数量、活性位点和预热炭的反应性均增加。整个过程中NO _x排放量约为156 mg/m ³ (@6% O ₂ )，燃料-N转化为NO _x的比例为2.98%，燃烧效率为96.5%。该实验结果将对煤泥的高效清洁利用起到至关重要的作用。