Simulation of Heat and Mass Balance in Rotary Kiln of Iron Pellets Induration

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Najafi, Alireza | 2018

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 50761 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Yuzbashizadeh, Hossein
Abstract:
In this study, the heat and mass balance of rotary kiln of iron pellets induration was simulated. Due to large amount of heat transfer calculations, a quasi three-dimensional model has been used in this study. First, the freeboard heat condition was simulated via fluent program and the average temperature of freeboard was stablished. Then, a one-dimensional heat transfer model was developed using heat transfer equations. In this model, the heat transfer via conduction, convection and radiation in different parts of the kiln was included. Also, the bed reactions and their effect on bed temperature were evaluated. Finally, transversal movement and velocity of particles was studied. Transversal temperature distribution of bed and wall was extracted from the model using the results of mentioned steps. The results showed that the transversal temperature distribution in uniform. Also, by adding 1 wt% of carbon to green pellets, the magnetite oxidation percentage increased from 7.1% to 7.8%. In addition, adding 1 wt% of carbon increased the final pellets temperature about 67 K
Keywords:
Mass Balance ; Rotary Kilns ; Simulation ; Pellets ; Thermal Balance ; Iron Pellet

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