Analysis of Exergy Loss in Syngas Premixed Flame

The exergy loss in laminar premixed flames of syngas is investigated by analyzing the local entropy generation. Particularly, the effects of the change in the H2 molar ratio in H2-CO mixture at two different temperature values (300 and 600 K) and at both atmospheric and high pressure (50 atm) conditions are deepened identifying both the mainly responsible process for exergy loss and the factors that can positively affect the performance of the syngas combustion. It is shown that the chemical reactions are not always the main contribution to the total entropy generation (i.e. to exergy loss) but the roles of the chemical reactions and heat conduction are strongly affected by pressure. Furthermore, it is underlined that the hydrogen content in syngas negatively affects the exergy loss while pressure increase has positive effects.