水泥炉窑烟气脱硝数值模拟与优化设计

Numerical simulation and optimization design of De-NOx for cement kiln and calciner

采用k-ε湍流流动模型,对2 500 t/d熟料生产线的TDF炉燃烧过程、喷氨方案及不同方案的脱硝反应进行了数值模拟。结果表明,煤粉燃烧的流场分布与实际基本吻合,分解炉内悬浮态的钙粉颗粒物有利于强化氨水的分散,氨水流量越大,喷射点可以保证的停留时间越长,60°的喷射角,都有利于NO_x的脱除。用模拟出来的参数指导工程设计,各项指标优于设计指标,虽然不能实施全方位的比对,但是,对将数值模拟技术应用于水泥脱硝工程设计进行了有益探索和经验总结。

Through κ-ε turbulent flow model, combustion process, ammonia injection scheme and denitrification reaction were simulated in 2 500 t clinker per day TDF furnace. The results showed that the flow field distribution of pulverized coal combustion fits in with the actual situation. The calcium powder particles suspended in the furnace is conducive to enhancing the ammonia dispersion. Ammonia flow, injection point to ensure longer residence time, 60° injection angle are helpful to remove NOx. By using the parameters of the simulation result to guide the engineering design, all of the running parameters were better than the designed ones. Although the full range of comparison could not be implemented, explore and summary the experience about the numerical simulation used in cement denitrification engineering design was beneficial.