Numerical simulation of enhanced cooling and solidification process of gas quenched blast furnace slag beads
The technology of blast furnace slag reinforced crushing is to use high-speed gas mixing with the strength-ened medium to break the slag into slag beads,so as to ensure the kinetic energy of crushing during granulation process,improve the crushing effect of slag,accelerate slag beads cooling rate,and optimize the amorphous content of granulation blast furnace slag beads,which can improve the utilization value of blast furnace slag.The solid pow-der slag was used as strengthened medium to study the condensation and heat exchange process of granulation slag beads.A two-dimensional model of single-particle slag bead enhanced cooling was established by fluid mechanics cal-culation method,comparing and exploring the difference in temperature field,velocity field,and pressure fields of slag beads with and without cold nucleus.The effects of different airflow,slag bead diameters and cold nucleus di-ameters on the complete solidification time and cooling rate were studied.The results show that the gas quenched blast furnace slag beads is cooled and solidified under the joint action of cold nucleus and external air flow,and the addition of strengthened medium increases the cooling speed.The solidification time of slag beads is 0.65 s shorter than that without cold nucleus under the condition of diameter of 2.0 mm,relative speed of 20 m/s and cold nucleus diameter of 0.5 mm.The complete solidification time decreases with the increase of airflow velocity,the decrease of slag bead diameter and the increase of cold nucleus diameter.The cooling rate increases with the increase of airflow velocity,the decrease of slag bead diameter and the increase of cold nucleus diameter.The research results can pro-vide theoretical support for high value resource utilization of blast-furnace slag.
blast furnace slagenhanced coolingnumerical simulationsolidification heat transfercomprehensive utilization of resources
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