Practice of energy efficiency improvement for the pyro system of the 10000 t/d production line

Aiming at the technical bottleneck of energy efficiency improvement of the CUCC (Xuzhou) 10000 t/d production line, a solution of pollution reduction and carbon reduction of the pyro system was proposed. The five-stage preheater was changed to a six-stage preheater for the first time in the 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 the rotary kiln was accelerated, and the cooler was changed to the fourth-generation cooler with middle roller crusher. After the modification, the outlet temperature of the preheater is reduced by 83 degrees C, the fuel consumption of clinker is reduced by about 98 kcal/kg.cl, the fuel consumption per unit product of clinker reaches and is lower than the level 1 index of the GB 16780-2021 standard by about 4%, 43000 t of standard coal is saved every year, and the annual carbon dioxide emission is reduced by 108000 t. Meanwhile, the emission reduction technology of the self-denitrification source is applied in the existing preheater tower. The NOx emission is lower than 25 mg/Nm(3) required by the local environmental protection department, the ammonia consumption is reduced by 10000 t/a. It provides 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.