Abstract: The high temperature exhaust gas from the rotary kiln head of the cement production line, after undergoing heat recovery through a grate cooler and a waste heat boiler, is discharged at approximately 100°C. Direct emission of this gas results in significant heat waste. By implementing the Cooler Air Loop System, both heat utilization efficiency and waste heat recovery (WHR) power generation can be further enhanced. Based on the heat balance principles, the input-output thermal equilibrium of the grate cooler was analyzed, and theoretical calculations were performed to evaluate heat variations at the waste heat boiler inlet. The results demonstrated that reintroducing the externally emitted kiln head exhaust into the grate cooler’s cooling air system increases the heat input to the boiler without altering other thermal parameters, thereby improving the steam turbine efficiency and boosting power generation.Taking a 5 000t/d dry-process clinker production line as an example, the design and installation of the Cooler Air Loop System were detailed, emphasizing optimization measures such as rational duct layout and advanced control technologies. Practical application showed that after Cooler Air Loop System implementation, WHR power generation increased by 6.38kW·h/t.cl, while exhaust emissions and thermal pollution were effectively reduced, yielding notable environmental and economic benefits.
张国平, 邹军辉, 谢华. 应用窑头循环风系统提高水泥窑余热发电量的实践[J]. 水泥技术, 2025, 1(3): 11-15.
ZHANG Guoping, ZOU Junhui, XIE Hua. Practice of Cooler Air Loop System to Increase WHR Power Generation. Cement Technology, 2025, 1(3): 11-15.
