Abstract
Iron ore sintering is a typical application of reactive porous media combustion (RPMC) which has been widely reported. In this work, a computational model of RPMC is developed, in which heat and mass transfer, as well as main chemical subprocesses in reactive porous media are incorporated. A gaseous-fuel injection method is examined to enable better heat pattern. However, the imbalance of heat distribution in the flow direction caused by internally recirculating heat released via a solid matrix is still problematic on energy efficiency. Through computations, it is observed that the heat pattern and melting quantity index (MQI) are sensitive on gaseous-fuel concentration, providing a possibility of improving the heat distribution imbalance. Numerical results are presented to demonstrate the benefits of fuel segregation. Finally, more reasonable heat pattern is observed by combinations of gaseous-fuel segregation with hot air and oxygen enrichment. The dynamics of gaseous/solid-fuel combustion zones caused by the hot air and oxygen enrichment would contribute to an expansion of melting zone near the inlet, producing a more reasonable and uniform heat distribution in a sintering bed.
Issue Section:
Porous Media
Keywords:
reactive porous media,
gaseous-fuel segregation,
fuel segregation,
hot air,
oxygen enrichment
Topics:
Fuels,
Heat,
Oxygen,
Sintering,
Melting,
Combustion,
Porous materials,
Temperature,
Iron,
Methane,
Oxidation
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