|
|
|
| Optimization and Engineering Application of a Direct-feeding System for Waste Textiles in Cement Kilns#br# |
| Cheng Wen, Hu Ming, Lv Bing, Liu Chenhao
|
| Gezhouba Jiayu Cement Co., Ltd. , Xianning Hubei 437221, China |
|
|
|
|
Abstract The cement industry, characterized by high-energy consumption and high carbon-emissions,increasingly utilizes combustible solid waste as a coal substitute to implement energy-saving and carbon-reduction policies and reduce production costs. This study details the implementation and optimization of a 5t/h waste textile direct-feeding system on a 4 800t/d new dry process clinker production line. To address operational challenges such as material blockage, dust accumulation in the tertiary air duct, and low Thermal Substitution Rates (TSR), a comprehensive process optimization was conducted. Key measures included the installation of a remote-controlled overhead crane and a four-stage dispersing device, optimization of the feeding-injection position of the precalciner, and stringent control of harmful components in the raw waste. Combustion characteristic analysis indicated that while waste textiles have a lower ignition temperature than pulverized coal, they exhibit a longer burnout time. By shifting the injection point from the tertiary air duct elbow to the lower oxygen-lean zone of the precalciner, the hidden danger of material accumulation in the tertiary air duct was completely eliminated, enabling stable 24h continuous operation. Consequently, the TSR increased from less than 2% to 2.5%. Industrial trials demonstrated the consumption of 4 500t of waste textiles without compromising clinker strength or free lime (f-CaO) content. This initiative resulted in a saving of 2 864t of raw coal, a reduction of 858t in CO2 emissions, and fuel cost savings exceeding CNY 2.8 million. This retrofit, characterized by low investment and high adaptability, provides a viable engineering reference for the co-processing of waste textiles in similar cement production lines.
|
|
Received: 18 January 2026
Published: 25 September 2026
|
|
|
|
|
|
|
|
