|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||9th International Symposium on High Temperature Metallurgical Processing
||Exergy and its Efficiency Estimations for Sponge Iron Production in a Rotary Hearth Furnace
||Binay Kumar, Gour Gopal Roy, Prodip Kumar Sen
|On-Site Speaker (Planned)
Exergy calculations have been attempted based on input and output stream data for a rotary hearth furnace (RHF) producing sponge iron. The stream data are computed under no heat loss condition and the stoichiometric addition of the reductant carbon using a thermodynamic model established earlier. Initially, an energy balance is computed based on estimated stream compositions and thermal state, predicted from the model with the help of thermodynamic software FactSage6.4. Subsequently, exergy for solid and gaseous streams are estimated based on standard exergy values and compared with the energy of streams. The total exergy destroyed and exergy efficiency is calculated as 1033.39 MJ and 39.41% per tonne of sponge iron, respectively. Exergy efficiency increases with the introduction of post-combustion in reduction zone. Exergy losses and exergy efficiencies per tonne of product iron produced through RHF route are comparable with conventional ironmaking process once slag is considered as a useful product.