Metode Cogeneration untuk Efisiensi Gas Turbine Generator 3x108 MW pada PLTGU Blok II PT. PLN Indonesia Power UBP Semarang
DOI:
https://doi.org/10.59024/jisi.v4i2.1748Keywords:
Cogeneration, Combined Cycle, Exergi, Gas Turbine Generator, Thermal EfficiencyAbstract
The low thermal efficiency of Gas Power Plants (PLTG) due to exhaust gas heat loss drives the implementation of cogeneration at PLTGU Block II PT. PLN Indonesia Power UBP Semarang. This study analyzes the performance of the Gas Turbine Generator (GTG), combined cycle efficiency, and Exergy distribution using a 3-3-1 configuration. The research utilizes actual operational data from January 28, 2026, sampled at 10-minute intervals. Results indicate that cogeneration via a Heat Recovery Steam Generator (HRSG) significantly enhances plant efficiency. The GTG output ranged from 273–283 MW with an efficiency of 30.0–30.2%. Following combined cycle integration, system efficiency increased to 43.9–44.4%, a gain of approximately 14%, with a heat rate of 11,916–11,988 kJ/kWh. Exhaust heat of 665–713 MW was recovered to generate an additional 130 MW through the Steam Turbine Generator (STG). Exergy analysis reveals that the largest irreversibility occurs in the GTG combustion process (285 MW), followed by the HRSG (185 MW) and STG (49 MW).
References
Arifin, M., Nugroho, A., & Setiawan, B. (2022). Analisis performa heat recovery steam generator pada pembangkit listrik tenaga gas dan uap menggunakan metode energi dan eksergi. Jurnal Rekayasa Mesin, 17(2), 85–94. https://jurnal.polines.ac.id
Fauzi, A., Prasetyo, H., & Firmansyah, D. (2021). Evaluasi efisiensi termal PLTGU berdasarkan variasi beban operasi turbin gas. Jurnal Teknik Mesin Indonesia, 16(1), 45–53. https://journal.unnes.ac.id
Kurniawan, R., Hidayat, T., & Santoso, E. (2023). Analisis kinerja combined cycle power plant untuk meningkatkan efisiensi pembangkitan listrik. Jurnal Energi dan Manufaktur, 16(2), 101–109. https://ojs.unud.ac.id
Prabowo, A., Siregar, M., & Wibisono, G. (2020). Kajian eksergi pada sistem pembangkit listrik tenaga gas dan uap untuk optimasi konsumsi bahan bakar. Jurnal Teknik ITS, 9(2), B156–B161. https://journal.its.ac.id
Yuliana, D., Hadi, S., & Nugraha, F. (2022). Pengaruh temperatur gas buang terhadap performa heat recovery steam generator pada PLTGU. Jurnal Teknologi dan Rekayasa Energi, 5(1), 27–35. https://ejournal.brin.go.id
Antariksa, A. A., et al. (2023). Optimisasi performa gas turbine generator (GTG) unit PLTGU Cilegon PGU melalui analisis performa pada variabel beban berbeda dan strategi peningkatan efisiensi. Jurnal Teknik Energi, 11(2), 39–48.
Boyce, M. P. (2012). Gas turbine engineering handbook (4th ed.). Butterworth-Heinemann.
Çengel, Y. A., Boles, M. A., & Kanoğlu, M. (2019). Thermodynamics: An engineering approach (9th ed.). McGraw-Hill Education.
Elwardany, M., Kumar, Y. S., & Nassif, N. (2026). Thermodynamic and exergy analysis of high-temperature heat pump systems for sustainable industrial heating. Progress in Engineering Science, 3(2), Article 100287. https://doi.org/10.1016/j.pes.2026.100287
Ganapathy, V. (2003). Industrial boilers and heat recovery steam generators: Design, applications, and calculations. Marcel Dekker.
Kaushik, S. C., Reddy, V. S., & Tyagi, S. K. (2011). Energy and exergy analyses of thermal power plants: A review. Renewable and Sustainable Energy Reviews, 15(4), 1857–1872. https://doi.org/10.1016/j.rser.2010.12.007
Kareem, A. F., Akroot, A., Wahhab, H. A. A., Talal, W., Ghazal, R. M., & Alfaris, A. (2023). Exergo-economic and parametric analysis of waste heat recovery from Taji gas turbines power plant using Rankine cycle and organic Rankine cycle.
Kehlhofer, R., Rukes, B., Hannemann, F., & Stirnimann, F. (2009). Combined-cycle gas & steam turbine power plants (3rd ed.). PennWell Books.
Moran, M. J., & Shapiro, H. N. (2014). Fundamentals of engineering thermodynamics (8th ed.). Wiley.
Purba, J. H. N. B. (2024). Analisis efisiensi gas turbine unit 2 sebelum dan sesudah overhaul di PLTGU Tanjung Uncang. Jurnal Teknik Energi, 6(1), 2–7.
Rasooli, M., Ali, H., & Safari, S. (2023). Investigation of a set of novel heat exchanger configurations of a heat recovery steam generator to improve the energy efficiency of combined cycle power plant. Journal of Renewable Energy, 10(1), 68–82.
Rezaei, R. A. (2023). Energy and exergy evaluation of a dual fuel combined cycle power plant: An optimization case study of the Khoy plant (pp. 97–109).
Saputra, A. D., Wibowo, P., & Anisah, S. (2025). Analysis of exhaust gas utilization at Belawan gas turbine power plant (PLTG) lot 3 to improve efficiency through a combined cycle system with a steam turbine (pp. 2933–2945).
Syarif, M. J., & Hantoro, R. (2013). Analisa unjuk kerja heat recovery steam generator (HRSG) dengan pendekatan media porous. Jurnal Teknik POMITS, 2(1), 1–6.
Wuryanti, S., & Jadmiko, R. D. (2021). Design of heat-recovery steam generator components in gas turbine (70 MW) combined cycle power plants (105 MW). International Journal of Mechanical Engineering and Robotics Research, 10(11), 612–619. https://doi.org/10.18178/ijmerr.10.11.612-619
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