Abstract
The primary-secondary air ratio is believed to impact both the combustion process and the overall performance of a power plant. This study aims to investigate how an increase in the primary-secondary air ratio affects the performance of a power plant located in North Gorontalo, South Sulawesi, Indonesia, using a GateCycle model. We conducted simulations of 48 variations based on three primary-secondary ratio values (PA-SA) to determine the optimal proportion of PA-SA. Our findings indicate that the optimal PA-SA ratio under stoichiometric conditions was 25-75%, resulting in a total cost of 108.03 million Rupiah per hour with a fuel burn rate of 22756 kg/h. When operating with 10% excess air, the optimal PA-SA ratio remains 25-75%, and the fuel flow and total cost were 22947 kg/h and 108.94 million Rupiah, respectively. Similarly, under 20% excess air, the optimal PA-SA ratio was also 25-75%, with a fuel flow rate and total cost of 23144 kg/h and 109.87 million Rupiah, respectively
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