Abstract
In this work, the new concept of a late mixing porous burner (LMPB) that is safe to operate with preheating zone of fuel and air mixture, resulting in an increase in the thermal efficiency, is studied. This is unlike conventional premixed porous burner technology, where the fuel and air are mixed early and have only a mixture preheated zone. The numerical model is calculated based on a single step global reaction, a steady state approach and a local thermal non-equilibrium between gas and solid phase. The results of the numerical model are validated by comparison with experimental data. Results from the simulation emphatically agree with the experimental data. The modelling can predict the burner performance at various operating conditions. Furthermore, modelling can also provide importation information; for example, it predicts the equivalence ratio and firing rate. This indicates that the LMPB achieved higher heat recirculation efficiency and higher radiant output efficiency compared with the conventional premixed porous burner.
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Support for this work by the Ministry of Education, Royal Thai Government under the project of Thailand National Research Universities (NRU) is gratefully acknowledged.