Discussion on the selection of denitrification process for a special cement clinker production line
The unit NOx output of a special cement clinker production line under the simultaneous action of"low nitrogen combustion at the kiln head+staged combustion in the decomposition furnace"is 5.52 kg/t.Theoretical calculations show that even the combination of"LNB+SCC+SNCR+SCR"for denitrification cannot simultaneously meet the rigid index of NOx ultra net emissions and unit ammonia consumption of clinker ≤ 4 kg/t.The combination denitrification process of"LNB+SCC+thermal carbon reduction+efficient SNCR+high-temperature and low dust SCR"is selected to meet policy requirements.After implementation,the NOx emission concentration can be precisely controlled to 45±5 mg/m3,and the NOx reduction per unit clinker is 5.38 kg/t,which is 3.64 times the NOx reduction per unit clinker in the conventional cement kiln denitrification process.It is expected that the ammonia consumption per unit clinker will be 2.69 kg/t,the coal consumption per unit clinker will increase by 1.36 kg/t,and the electricity consumption per unit clinker will increase by 2.68 kWh/t.The comprehensive operating cost per unit clinker denitrification will be reduced from the current 9.31 yuan/t to 7.27 yuan/t,and the annual denitrification operating cost will be saved by 1.13 million yuan.
SCR denitrificationaccurate denitrificationgasifierthermal carbon reductionspecial cementammonia nitrogen ratio
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