Analisis Numerik Variasi Bukaan Damper HRSG Tanjung Uncang Terhadap HP Superheater Tube Pada Pola Operasi Warm Start

Subagya, Samuel Ronald Torang (2025) Analisis Numerik Variasi Bukaan Damper HRSG Tanjung Uncang Terhadap HP Superheater Tube Pada Pola Operasi Warm Start. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

PLTGU menggunakan siklus kombinasi gas turbin (CCGT), seperti yang diterapkan di PLTGU Tanjung Uncang di Batam sebagai sumber energinya dengan memanfaatkan udara panas hasil buangan turbin gas untuk menghasilkan steam untuk menggerakkan steam turbine. Ketika turbin ini beroperasi, umumnya diawali dengan proses starting. Terdapat berbagai macam kondisi starting dalam HRSG, salah satunya adalah warm start. Dalam kondisi warm start, PLTGU Tanjung Uncang menerapkan prosedur operasi standar (SOP) untuk pemanasan awal. Ketika HRSG outservice dalam kondisi peak load pada tengah hari, dilakukan bocoran damper untuk mempertahankan steam pada HP Superheater hingga tengah malam untuk dapat dilakukan turun beban gas turbin. Proses kemudian dilakukan dengan membuka damper 10o dengan load 10 MW. Hasil simulasi dilakukan untuk mengetahui tahanan termal material berdasarkan bukaan damper 5o, 10o, dan 25o dengan kondisi ketika temperatur steam 175oC, 250oC, 300oC, dan 420oC pada saat turbin gas diberi pembebanan 30 MW. Ditemukan bahwa pada kondisi bukaan damper 5o dan 10o dengan keseluruhan kondisi steam variasi berada dalam kondisi safe. Sedangkan untuk pola operasi dengan bukaan damper 25o, ditemukan bahwa kondisi operasi aman ketika temeperatur steam dalam HP Superheater telah berada pada temperatur dengan nilai minimum sebesar 250oC. Sehingga, ditemukan bahwa pola operasi baru warm start dapat dilakukan tanpa harus menurunkan beban pada gas turbin.
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Combined Cycle Gas Turbine (CCGT) power plants, such as the Tanjung Uncang CCGT Power Plant in Batam, utilize their combined cycle for energy generation. This process involves recovering hot exhaust gases from the gas turbine to produce steam, which then drives a steam turbine. The operation of these turbines typically begins with a starting sequence. Within the Heat Recovery Steam Generator (HRSG), various starting conditions exist, one of which is a warm start. For warm start conditions, the Tanjung Uncang CCGT Power Plant implements a standard operating procedure (SOP) for pre-heating. When the HRSG is taken out of service during peak load at midday, a damper leakage is performed to maintain steam in the HP Superheater until midnight, allowing for gas turbine load reduction. Subsequently, the process proceeds by opening the damper to 10 degrees with a 10 MW load. Simulations were conducted to determine the thermal resistance of the material based on damper openings of 5 degrees, 10 degrees, and 25 degrees, with varying steam temperatures of 175°C, 250°C, 300°C, and 420°C when gas turbine has 30 MW load. The results indicate that operations with damper openings of 5 degrees and 10 degrees are safe across all tested steam temperature variations. Meanwhile, for a 25-degree damper opening operation, safe conditions are achieved only when the steam temperature in the HP Superheater has reached a minimum value of 250°C. Based on the study it founds that new operational standard for warm start is feasible without reducing the gas turbine load.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	HP Superheater, HRSG, Thermal Stress, Warm Start
Subjects:	T Technology > TD Environmental technology. Sanitary engineering > TD899.S68 Steam power plants
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Samuel Ronald Torang Subagya
Date Deposited:	30 Jul 2025 09:33
Last Modified:	30 Jul 2025 09:33
URI:	http://repository.its.ac.id/id/eprint/121884

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