【摘要】 利用自定义燃烧模型对煤粉与城市污泥共燃过程进行数值模拟，研究不同掺烧比例下共燃过程的燃烧特性、NO_x体积分数空间分布和生成行为等。结果表明：污泥对煤粉第一阶段燃烧有明显的促进作用，在掺烧比例≤3%时，对煤粉第二阶段燃烧也有促进作用，而在掺烧比例≥6%时有抑制作用；在燃烧器出口附近氮存在形式丰富，大部分NH₃在该区域转换为HCN,少量转换为HNO和NH₂等，而在回流区后半段，HCN体积分数明显降低，NO体积分数上升，随着燃烧反应的进行，部分NO被还原成HCN和HNO;NO_x生成行为主要集中发生在燃料燃烧的2个阶段，在第一阶段，NO的生成过程主要为NH被O和O₂氧化以及N被O₂氧化，第二阶段主要为NH被O氧化以及N被CO₂氧化；NO被CH₃还原成HCN是2个阶段中NO被还原的主要过程。更多还原

【Abstract】 Co-combustion process of pulverized coal and municipal sludge was simulated by the customized combustion reaction model, while the combustion characteristics, NO_x volume fraction distribution and formation behavior under different mass ratios of the sludge were studied. Results show that sludge can promote the combustion of pulverized coal in the first stage obviously, and it can promote the combustion of pulverized coal in the second stage with the ratio less than 3% and inhibit the combustion of pulverized coal with the ratio more than 6%. Nitrogen exists in various forms near the outlet of the burner, where most of NH₃ is converted to HCN and a small amount of NH₃ is converted to HNO and NH₂, etc. In the second half of the recirculation zone, HCN volume fraction is significantly reduced, NO volume fraction rises, and part of NO is reduced to HCN and HNO in the combustion. NO_x is mainly generated in two stages of coal combustion. In the first stage, NO generation process is mainly the oxidation of NH by O and O₂, and the oxidation of N by O₂;The second stage is mainly the oxidation of NH by O and the oxidation of N by CO₂. The reduction of NO to HCN by CH₃ is the main process of NO reduction in two stages.更多还原