Faculty of Chemical, Petroleum and Gas Engineering- Semnan University
Domestic companies of metal and alloy production have faced many problems in providing required fuel. These companies often use traditional industrial furnaces, which in addition to very high energy consumption, have a very negative impact on the environment. For this reason, the proposal of modern processes for metal oxide reduction to decrease the energy consumption will be of great interest. In this research, the carbon bed of a new metal oxide reduction system operated under microwave waves is modeled. In this system, the carbon bed is responsible for heating process and converts electromagnetic waves into heat. Due to the fact that the metal oxide granules in this system are located inside the carbon bed and the carbon bed convert almost all electromagnetic waves, the heating effects of metal oxides were ignored. Comparison of the modeling results with experimental data related to carbon bed rising temperature trend showed that the used model has good accuracy and the average error is less than 5%. Based on the modeling, it was found that with increasing the microwave power from 1000 w to 1200 w, the carbon bed temperature (excluding metal oxide granules) increased by 9%. In addition, SiC had better performance compared to the carbon bed in terms of the rate of heat generation. In addition, it was found that by increasing the carbon bed emissivity parameter, the maximum temperature decreased. By changing the emissivity parameter from 0.95 to 0.65, the final bed temperature increased by 9% after 15 minutes.