Publication: Design and optimization of flameless combustion chamber fueled by producer gas
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Date
2023-07-14
Authors
Ahmad Firdaus bin Ishak
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Abstract
Flameless combustion is regarded as an advancement in combustion technology due to its low pollutant emission, stable temperature distribution and reduction in noise while retaining the thermal efficiency of the system. In this study, a combustion chamber fueled by producer gas was designed to achieve flameless combustion. The design was developed with different inlet nozzle diameters ranging from 20 to 50mm and combustor height of 500 to 800 mm. Computational fluid dynamics (CFD) simulations were conducted to investigate the effect of varying chamber height and inlet diameter on flameless combustion performance. Producer gas composition and simulation setting were derived from previous experimental and numerical studies. The performance of the designed chambers was evaluated based on CO and NOx emissions, as well as the Damköhler number. Design of Experiment (DOE) technique was used to optimize the chamber design. The results showed that the chamber height and inlet nozzle diameter had a limited influence on combustion performance. Increasing the chamber height will increase the probability of achieving flameless combustion due to longer residence time. However, NOx emissions are shown to increase as well because fuel molecules can produce more NOx if they are exposed to high temperatures for a longer period time. Smaller inlet nozzle diameter significantly reduces the Damköhler number which gives an estimation of the degree of conversion in the combustion process. The optimization from Minitab suggested the chamber with an inlet nozzle diameter of 20 mm and a chamber height of 800 mm will achieve desirable flameless combustion with reduced CO emissions and NOx emissions.