Abstract: Aiming at the technical bottleneck of energy efficiency improvement of CUCC(Xuzhou)
10 000t/d production line Ⅰ, a solution of pollution reduction and carbon reduction of pyro system was proposed. The five-stage preheater was changed to six-stage preheater for the first time in chinese cement industry. The calciner volume was expanded and self-denitrification technology was adopted to improve the efficiency of the main combustion area, the speed of rotary kiln was accelerated, and the cooler was changed to the fourth-generation cooler with middle roll crusher. After the transformation, the outlet temperature of the preheater is reduced by 83℃, the standard coal consumption of clinker is reduced by about 14kg/t.cl, the comprehensive coal consumption per unit product of clinker reaches and is lower than the level 1 index of GB 16780-2021 standard by about 4%, 43 000 tons of standard coal is saved every year, and the annual carbon dioxide emission is reduced by 108 000 tons. Meanwhile, the emission reduction technology of self-denitrification source is applied in the existing preheater tower. The NOX emission is lower than 25mg/Nm3 required by the local environmental protection department, the ammonia consumption is reduced by 10 000 tons, and provide a technology demonstration for the new upgrading of cement manufacturing under the double carbon strategy background, double control of energy consumption and ultra-low emission targets.
