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Abstract
Gas turbine efficiency is an indicator to determine the performance of a generator. The greater the efficiency value of the gas turbine in a generator, the better the performance of the generator. One of the things that affect the value of the efficiency of a gas turbine is the air fuel ratio. Air Fuel Ratio (AFR) is the ratio of the amount of air and fuel in the combustion process in units of mass or volume. Air fuel ratio is a factor that affects the perfection of the combustion process in the combustion chamber. In the graphic image it can be seen that the lowest AFR values are on July 3 and 4 2022, when the gas turbine produces a loading of 20900 kW and 20100 kW with an AFR value of 39.76 unitless each. Whereas the highest AFR value is on June 28 2022 when the gas turbine produces a loading of 20780 kW with an AFR value of 40.68 unitless. The highest gas turbine efficiency value is on June 30, 2022, at a loading of 20,650 kW with a gas turbine efficiency of 83.3%. The lowest efficiency value is on July 2, 2022, at a load of 20,800 kW with a gas turbine efficiency of 81.05%. From the results of existing data processing and graphs, it can be seen that the value of the air fuel ratio and the efficiency of the gas turbine are inversely proportional, which means that when the value of the air fuel ratio decreases, the value of the efficiency of the gas turbine tends to increase. However, there are some deviations when the value of the air fuel ratio decreases, the efficiency of the gas turbine also decreases. Therefore it can be concluded that the value of the air fuel ratio affects the value of the efficiency of the gas turbine, however, the value of the air fuel ratio is not the only factor that affects the value of the efficiency of the gas turbine.
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References
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References
Fadillah, Dimas Dinalda. (2020). ”Analysis of The Comparative Unit 2.3 Gas Turbine Performance Before and After Combustor Maintenance with The Commisioning Condition in PLTGU Gresik”. Skripsi. Fakultas Teknologi dan Bisnis Energi. STT-PLN: Jakarta
Fahmi, Al-Tekreeti W. K., et al. (2022). “A comprehensive review on mechanical failures cause vibration in the gas turbine of combined cycle power plants”. Department of Mechanical and Instrumental Engineering. RUDN University. Engineering Failure Analysis.
Jamaludin, dan Iwan Kurniawan. (2017). “Analisis Perhitungan Daya Turbin yang Dihasilkan dan Efisiensi Turbin Uap pada Unit 1 dan Unit 2 di PY. Indonesia Power Uboh UJP 3 Lontar”. Banten.
Moran, Michael J., dan Howard N. Shapiro. (2006). “Fundamentals of engineering thermodynamics: SI version”. Great Britain: Scotprint, East Lothian
Sunarwo, Teguh Harijono M. (2016). “Analisa Efisiensi Turbin Gas Unit 1 Sebelum dan Setelah Overhaul Combustor Inspection di PT PLN (Persero) Sektor Pembangkitan PLTGU Cilegon”. Jurnal Teknik Energi.Vol 12. No. 2, 50-57
Syammary, Rakha. Hendri. Lukfianto. (2020). “Analisis Efisiensi Turbin Gas Tipe V94.2 Sebelum dan Sesudah Minor Inspection Pada Blok 4 Unit 3 Pltgu Muara Tawar”. Jurnal Power Plant. Vol 8 No.2.
Yusron, Ahmad. dan Danang Dwi Saputro. (2018). “ Analisa Performa Heat Recovery Steam generator Sebelum dan Sesudah Cleaning di PT Indonesia Power Tambak Lorol Semarang Menggunakan Software Mat.
Hendra Dwipayana, M Alf Akbar Baraf. 2019. Analisis Perbandingan Performansi Pembangkit Listrik Tenaga Gas TM 2500 Jakabaring Unit 2 dan Unit 3 pada waktu beban puncak, TEKNIKA: Jurnal Teknik: Vol 6 No 2
Boyce, P. Mehewan. 2012. Gas Turbine Engineering Handbook 4th Edition. The boyce Consultancy Fellow, American Society of Mechanical Engineers (ASME). United Kingdom.
V. Ganesan. 2010. Gas turbines 3rd edition. Tata McGraw-Hill. New delhi.
Michael J. Moran and Howard N. Shapiro. 2014. Fundamental Engineering Thermodynamic. Wiley. USA.
Firmansyah. Fikri Logi. 2017. Analisa Perbandingan Performa Turbin Gas PLTGU unit 1.2 dan 1.3 pada beban 50 MW dan 100 MW. Insitut Teknologi Sepuluh November. Surabaya.