Abstract
High temperature slags carry a substantial amount of high quality thermal energy (up to 1550°C), and represent the largest undeveloped energy sources in steel industry. However, the waste heat recovery rate of slags is less than 2% in China. So there is a great potential of waste heat recovery. Our study mainly investigated the cooling processes of high temperature slags using Single Hot Thermocouple Technique (SHTT) and Computational Fluid Dynamics (CFD) method. A series of slags with the constant CaO/SiO2 ratio and different Al2O3 contents were designed and analyzed. The SHTT results indicated that the variation of Al2O3 content greatly changed the slag properties, including crystallization ability and glass forming ability, and this had a great effect on heat recovery of slags. We proposed a multi-stage control method of heat recovery from slags. The CFD results indicated that the temperature differences could be over 100°C between core and surface of slag droplets with the diameter of 3 mm. These large temperature differences could cause crystallization inside the slag droplets, which should be considered in the actual processes of heat recovery.
Published Version
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