COMBINED IMPACT OF PRIMARY-SECONDARY RATIO AND EXCESS AIR ON COAL-FIRED POWER PLANT PERFORMANCE

Djarot Darmadi; Nurdin Teguh; Lilis Yuliati; Eko Siswanto; Marco Talice

doi:10.5937/jaes0-44064

Djarot B. Darmadi Mechanical Engineering Department, Faculty of Engineering, Brawijaya University, Malang, Indonesia
Nurdin Hasananto Teguh Mechanical Engineering Department, Faculty of Engineering, Brawijaya University, Malang, Indonesia
Lilis Yuliati Mechanical Engineering Department, Faculty of Engineering, Brawijaya University, Malang, Indonesia
Eko Siswanto Mechanical Engineering Department, Faculty of Engineering, Brawijaya University, Malang, Indonesia
Marco Talice PMSQUARED Engineering S.r.l.s, Cagliari, Italia

DOI: https://doi.org/10.5937/jaes0-44064

Keywords: primary air, secondary air, excess air, power plant, efficiency, GateCycle

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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