Research progress in numerical simulation of waste heat recovery from blast furnace slag
Blast furnace slag is a typical byproduct in the ironmaking process of blast furnaces,with an emission tem-perature of up to 1 450-1 550℃.It has a large amount of high-grade thermal energy and accounts for nearly 30%of the total energy consumption of the steel industry.Efficient recovery of blast furnace slag waste heat provides a guar-antee for the green and high-quality development of the steel industry.Blast furnace slag is currently efficiently treated via dry granulation technology.Scholars have conducted relevant research on the transformation from molten slag to granular slag and waste heat recovery in the granular slag flow process.They have achieved certain results.Through numerical simulation,costs can be reduced,and key links in the waste heat recovery process can be system-atically summarized,providing theoretical guidance for practical operations.On this basis,this article systematically elaborates on the current status of physical method treatment for waste heat recovery of blast furnace slag and com-monly used numerical methods for simulation of blast furnace slag.It provides a detailed introduction to the research status of multiphase flow and heat transfer characteristics of blast furnace slag in the centrifugal granulation process and heat exchanger.In the centrifugal granulation process,researchers have utilized various models to conduct numerical simulations on the solidification process of slag.This research aims to investigate the impact of particle properties and operating conditions on waste heat recovery,as well as to optimize operating parameters.During the cooling process of the heat exchanger,scholars utilized DEM-CFD simulation to conduct an in-depth investigation into the multiphase flow and heat transfer characteristics of blast furnace slag in fluidized beds,fixed beds,and mov-ing beds.Numerical simulation provides guidance for optimizing waste heat recovery processes,but most studies focus on multiphase flow characteristics of blast furnace slag with limited research on heat transfer and chemical reac-tions.Moreover,slag particle modeling has certain conditions and ignores deformation and agglomeration.There-fore,finding suitable mathematical models and strengthening research on heat transfer characteristics and chemical reactions to optimize the slag waste heat recovery process and improve recovery efficiency have become the future development direction.
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