Abstract
When utilizing moving bed heat exchanger for waste heat recovery from blast furnace slag, it's essential to enhance the cooling rate in the high-temperature section to meet the requirements for resource utilization. In this study, we introduced moving bed heat exchanger with airflow-assisted cooling, building upon the shell-and-tube design. This innovation enhanced the cooling rate of the section above the glass transition temperature in the heat exchanger, surpassing the critical cooling rate, through the introduction of cooling airflow in the high-temperature section. Experimental studies were conducted to investigate the impact of airflow Reynolds number, granular Peclet number, and the dimensionless height of the section with cooling airflow on Nusselt number, recovery efficiency, local cooling rate, and pressure drop. Multi-objective optimization of these parameters were performed using hierarchical analysis, leading to the determination of the optimal operational parameters for airflow-assisted cooling moving bed heat exchanger, resulting in Pes=10.18, Reg=2969, and Hap/H=1/9. The Nusselt number, recovery efficiency and pressure drop corresponding to the optimal parameters were 3.593, 79 % and 407.57 pa, respectively.
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