| Aiming at the dual challenges of high energy consumption and high carbon emissions in the cement industry, as well as the demand for resource utilization of agricultural and forestry solid wastes, this paper conducts an application study on biomass alternative fuels derived from agricultural and forestry residues including cotton stalks and fruit tree branches, based on a 4000 t/d new dry-process cement production line in Aksu, Xinjiang. An integrated technical route consisting of crushing pretreatment, step combustor, and capacity expansion retrofitting of the calciner was adopted, to solve the common industrial pain points caused by biomass fuel combustion, including high moisture content, long burnout time, proneness to scaling and blockage, and operational fluctuations of the firing system. The industrial operation results show that the thermal substitution rate reaches 14.7%; the standard coal consumption per ton of clinker is reduced from 96.44 kg to 82 kg, achieving an annual coal saving of 20,500 tons and an annual CO₂ emission reduction of 43,900 tons. The ammonia consumption per ton of clinker is reduced by 42.7%, with NOₓ emissions meeting the standard stably. Key parameters including system resistance and temperature are within the safe and controllable range, while the clinker quality and operation stability of the production line fully meet the production requirements. |