Studi Numerik Karakteristik Perpindahan Panas Pada High Pressure Turbin Saat Proses Stop Unit Dengan Sliding Pressure Di Supercritical Steam Turbin

Santoso, Budi (2022) Studi Numerik Karakteristik Perpindahan Panas Pada High Pressure Turbin Saat Proses Stop Unit Dengan Sliding Pressure Di Supercritical Steam Turbin. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pada pemeliharaan turbin PLTU, untuk proses open casing turbin dilakukan setelah First Stage Metal Temperature dibawah 150°C. Apabila menggunakan metode stop unit normal dan pendinginan natural maka akan membutuhkan waktu sekitar 14 sampai dengan 17 hari, sehingga waktu pemeliharaan turbin menjadi lama dan kesempatan produksi listrik menjadi berkurang.
Untuk mempercepat waktu pendinginan First Stage Metal Temperature Turbin digunakan metode proses Stop Unit dengan Sliding Main Steam Pressure. Untuk itu dilakukan penelitian terhadap perpindahan panas yang terjadi di HP Turbin dari data parameter stop unit dengan sliding pressure yang pernah dilakukan dan disimulasikan sebanyak 3 variasi untuk mencari pendinginan akhir terbaik.
Komponen HP Turbin akan lebih cepat didinginkan menggunakan metode stop unit dengan sliding pressure dengan waktu 10 jam jika dibandingkan dengan stop unit normal yang memerlukan waktu 101 jam. Hasil analisa total biaya proses dan kerugian dari metode stop unit dengan sliding pressure sebesar 10,1 milyar rupiah lebih murah bila dibandingkan dengan stop unit normal dengan pendinginan natural yaitu sebesar 51,28 milyar rupiah. Upaya yang dilakukan untuk mempercepat proses pendinginan yaitu dengan memperbesar aliran main steam dan dengan memperbesar nilai kecepatan aliran fluida yang akan memperbesar nilai reynold numbernya sehingga nilai koefisien panas konveksi juga akan menjadi besar. Pendinginan paling maksimal di komponen HP Turbin dari hasil perbandingan variasi simulasi di akhir proses yaitu pada variasi 3 (load 645 MW). Rekomendasi untuk proses stop unit dengan sliding pressure yaitu dimulai dari beban 645 MW.
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In turbine maintenance, the turbine open casing is carried out after First Stage Metal Temperature below 150°C. If using the normal stop unit method and natural cooling, it will take about 14 to 17 days, so the turbine maintenance time becomes longer and the opportunity for electricity production is reduced.
To speed up the cooling time of the First Stage Metal Temperature Turbine process method Stop Unit with Sliding Main Steam Pressure. For this reason, a research was conducted on heat transfer that occurred in the HP Turbine parameter data stop unit with sliding pressure that had been carried out and simulated as many as 3 variations to find the best final cooling.
HP Turbine components will be cooled faster using the stop unit method with sliding pressure with a time of 10 hours when compared to a normal stop unit which takes 101 hours. The results of the analysis of the total process costs and losses from the stop unit method with sliding pressure of 10.1 billion rupiahs are cheaper when compared to normal stop units with natural cooling, which are 51.28 billion rupiahs. Efforts are made to speed up the cooling process, namely by increasing the main steam flow and by increasing the value of the fluid flow velocity which will increase the Reynolds number so that the convection heat coefficient will also be large. The maximum cooling in the HP Turbine component is the result of the comparison of simulation variations at the end of the process, namely variation 3 (load 645 MW). The recommendation for the stop unit process with sliding pressure is starting from a load of 645 MW.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	First Stage Metal Temperatur & Stop Unit
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ266 Turbines. Turbomachines (General)
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21101-(S2) Master Thesis
Depositing User:	Budi Santoso
Date Deposited:	14 Feb 2022 03:56
Last Modified:	02 Nov 2022 02:20
URI:	http://repository.its.ac.id/id/eprint/93853

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