Numerical study on solidification behaviors of a molten slag droplet in the centrifugal granulation and heat recovery system
| Autor: | Hong Wang, Yu Tan, Qiang Liao, Xian-Yan He, Xun Zhu, Bin Ding |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Blast furnace
Materials science 020209 energy Drop (liquid) Metallurgy Enthalpy Energy Engineering and Power Technology 02 engineering and technology Heat transfer coefficient 021001 nanoscience & nanotechnology Industrial and Manufacturing Engineering Granulation Molten slag Fluidized bed Heat recovery ventilation 0202 electrical engineering electronic engineering information engineering 0210 nano-technology |
| Zdroj: | Applied Thermal Engineering. 130:1033-1043 |
| ISSN: | 1359-4311 |
| DOI: | 10.1016/j.applthermaleng.2017.11.080 |
| Popis: | Centrifugal granulation technique is the most feasible method for heat recovery from molten blast furnace (BF) slag. The granulated slag droplets experience a complex cooling process to achieve a glassy phase for cement clinker. In the present study, an enthalpy-based model is established to investigate solidification behaviors of a molten BF slag droplet cooled in the centrifugal granulation and heat recovery system. Moreover, influences of droplet flying speed and time in the flying process, heat transfer coefficient and cooling air temperature in the primary fluidized bed as well as droplet initial temperature and diameter are discussed on the solidification behaviors of the BF slag droplet. The numerical results indicate that the temperature of droplet outer surface successively experiences a rapid drop in the flying process, rebound and then gradual decrease in the primary fluidized bed due to the variable cooling condition. Moreover, for a specific granulating device as well as the slag droplet with diameter of 5 mm and initial temperature of 1673 K, the condition with heat transfer coefficient of 50–76 W·m−2·K−1 and cooling air temperature of 889–973 K are the optimized cooling conditions for the heat recovery stage to satisfy the multiple goals. |
| Databáze: | OpenAIRE |
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