In order to reduce the nitrogen oxide emission of cement plant, the denitrification of decomposing furnace is studied in this paper.\nBased on Fluent software platform, the 2500 t/d new dry-process cement kiln decomposing furnace of a plant is modeled and\nsimulated by using air fractional combustion technology combined with selective noncatalytic reduction technology. The model\nand simulation methods are verified by the field test. The effects of the urea injection position and ammonia-nitrogen molar ratio\non NO, NH3, and denitrification efficiency are studied by numerical simulation. The results show that the optimal injection\nposition of the urea solution is 12 m, the optimal ammonia/nitrogen molar ratio is 1.8, and the optimal injection velocity of the\nurea solution is 40 m/s. The simulation results obtained under the optimal parameters are as follows: NO concentration is\n187.60 mg/m3, NH3 escape is 32.40 mg/m3, and denitrification efficiency is 74.75%.
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