Effect of freeboard deflectors on the exergy in a fixed bed combustor

This study includes experiments conducted on a continuous feed pellet combustor, with a freeboard deflector located at different axial locations. The aim is to characterize the relative impact of freeboard deflectors on the mechanical exergy profiles and exhaust gas total exergy, over a range of stoichiometry (primary and secondary air flow rates). Results indicate that deflectors affect the mechanical exergy in the downstream, however their influence depends on their relative (axial) position (H). Furthermore, results reveal that for the tests with and without deflector, both CO chemical exergy and total exergy decrease in a similar manner when the air-fuel equivalence ratio (λ) increases. It has been found that deflectors do not appear to affect the total and CO chemical exergy at the exhaust section of a lab-scale combustor, bearing in mind a ±3% variation in temperature, CO emissions as well as exergies is estimated based on the uncertainty analyses undertaken.