1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Tsinghua University,Beijing　 100084,China;2. Key Laboratory for Clean Combustion and Flue Gas Purification of Sichuan Province,Dongfang Boiler Co. ,Ltd. ,Dongfang Electric Group,Zigong　 643099,China

在前期工作中开发了新的煤粉燃烧NO_x预测模型,使用CO,H2浓度表征碳氢化合物含量来刻画NO_x的均相还原,编写程序以UDF的形式将NO_x模型、包含气化反应的焦炭燃烧模型嵌入Fluent中,实现新的NO_x模型与先进湍流、辐射换热模型的耦合计算。在此基础上,进一步改造完善沉降炉、一维炉实验平台,开展不同煤种、不同工况下的燃烧实验,获得高质量的实验数据。使用新的NO_x预测模型对各工况进行模拟、对比,建立适用于不同煤种的模型参数数据库。最后将新的NO_x模型及参数数据库应用于四角切圆锅炉、对冲火焰锅炉以及W火焰锅炉的CFD计算中。结果表明新的NO_x模型可以合理预测不同煤种、不同炉型、不同运行条件下NO_x的生成与还原,这就为锅炉、燃烧器的低NO_x设计、改造与优化奠定了基础。

In the previous work,a new NOx prediction model for pulverized coal combustion has been developed;the concentrations of CO and H2 were used to represent the fraction of CHi to quantitatively describe NOx gas phase reduc- tion;by making codes,the new NOx model and char burning model considering gasification reactions were implemented with Fluent. Based on this,a drop tube furnace (DTF) and a one-dimensional furnace were updated and the combus- tion experiments of different coals under different conditions were conducted to collect experimental data of high quali- ty. The parameter database of the new NOx model was built via the simulations of such basic experiments. Finally,the developed NOx model was successfully applied in the CFD simulations of tangential-fired boiler,opposed firing boiler and W-shaped flame boiler. Simulation results of three types of boilers under different operational conditions indicate that the new NOx model is able to accurately simulate the effects of different coals,different boiler types and different operational conditions on NOx evolution. This work provides a model basis for the further design,modification and opti- mization of low-NOx burner and boiler.

国家自然科学基金资助项目(51376105)；“十三五”国家重点研发计划资助项目(2016YFB0600801)；

Li Zhenshan,Chen Denggao,Zhang Zhi,et al. Prediction of NOx during pulverized coal combustion:Parameter database and CFD applica- tion[J]. Journal of China Coal Society,2016,41(12):3142-3150.