Based on the requirements of double control of energy consumption in the cement industry under the background of double carbon, the main factors affecting heat consumption in the thermal balance expenditure of the existing production line were analyzed through the calculation of thermal efficiency. It put forward the energy efficiency improvement solution, which is typically applied in the technical transformation of the existing production line, and the thermal efficiency of the sintering system is further increased by 5%~9%. Fuel consumption per unit product of clinker can be reduced by more than 10kg/t.cl, reaching and better than level 1 of GB 16780-2021. It improves energy efficiency while taking into account the environmental protection function of the pyro-system, through the application of calciner self-denitrification technology to reduce source emission. The CO content out of calciner would not exceed 500ppm and the original NOx before ammonia below 350mg/Nm³, the ammonia water consumption below 3kg/t.cl under the condition of NOx emission below 50mg/Nm³ of environmental protection requirements. These measures and technology would help the plants to meet the rapid development of enterprises.