| To further explore carbon reduction potential and establish a benchmark enterprise, systematic research and multiple rounds of technical evaluation were conducted on a 5,000 t/d cement clinker production line in Gansu Province. Key technical bottlenecks and operational pain points restricting further energy efficiency improvement were accurately identified, including poor heat exchange efficiency of the preheater, insufficient calciner volume, high raw NOx concentration, and excessive resistance in certain pipelines. A series of technical retrofit measures were implemented, such as upgrading the preheater from a five-stage to a six-stage system, expanding the calciner volume, applying in-depth self-denitrification technology in the calciner, reducing resistance in process pipelines, and installing high-efficiency energy-saving fans. As a result, the comprehensive energy consumption per unit of clinker reached 92.89 kgce/t, outperforming the Level 1 energy consumption requirement specified in GB 16780-2021. The annual savings amount to 0.885x104t of standard coal, 2.2x104t of CO2 emission reduction, and 3.75x106 kWh of electricity. The energy-saving and carbon-reduction effects are remarkable. |