Studi Numerik Karakteristik Aliran Dan Perpindahan Panas Pada Proses Forced Cooling High Pressure Turbine PLTU Lontar

Suyadi, Suyadi (2020) Studi Numerik Karakteristik Aliran Dan Perpindahan Panas Pada Proses Forced Cooling High Pressure Turbine PLTU Lontar. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Perbaikan peralatan turbin pada pembangkit listik PLTU dibeberapa kasus gangguan memerlukan proses shutdown unit dan stop turning gear. Untuk melakukan stop turning gear pada turbin, temperature HP inner cylinder disyaratkan harus dibawah 130 °C. Untuk mencapai temperature syarat minimal stop tuning gear diperlukan waktu sekitar 8 hari dengan proses natural cooling. Untuk mempercepat proses pendinginan, dilakukan pendinginan paksa dengan cara mengalirkan uap sisa didalam boiler dan udara yang mengalir melalui boiler dengan temperature yang lebih rendah dari temperature HP inner cylinder ke dalam turbin. Forced cooling pada turbin dengan menggunakan fluida berupa uap sisa didalam boiler selanjutnya dengan udara yang mengalir melalui boiler. Penelitiaan ini dilakukan simulasi menggunakan pendekatan numerik yaitu Computational Fluid Dynamic (CFD) dengan Fluent. Simulasi pendinginan dilakukan dengan varisasi mass flow rate fluida pendingin 0,1 kg/s dan 0,5 kg/s dengan fluida pendingin uap dan udara. Hasil simulasi menunjukkan laju pendinginan yang berbeda pada setiap stage. Kecepatan aliran rata-rata dan besarnya perbedaan temperatur antara sudu dan fluida berpengaruh terhadap nilai koefesien perpindahan panas rata-rata. Koefisien perpindahan panas rata-rata tertinggi pada stage 1 sebesar 46,41 W/m2 °C dengan mass flow rate 0,1 kg/s dan sebesar 79,1 W/m2 °C dengan mass flow rate 0,5 kg/s saat menggunakan fluida pendingin berupa uap.
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Repairing turbine equipment in power plants in some power cases requires shutdown of the unit and stop turning gear. To make a stop turning gear on a turbine, the HP inner cylinder temperature must be below 130 ° C. To reach the minimum temperature requirement, stop tuning gear takes about 8 days with a natural cooling process. To speed up the cooling process, forced cooling is carried out by flowing residual steam in the boiler and air flowing through the boiler at a temperature lower than the temperature of the HP inner cylinder into the turbine. Forced cooling in the turbine using fluid in the form of residual steam in the boiler next to the air flowing through the boiler. This research was conducted simulations using a numerical approach namely Computational Fluid Dynamic (CFD) with Fluent. Cooling simulations were performed with a mass flow rate of the cooling fluid 0.1 kg/s and 0.5 kg/s with the cooling fluid steam and air. The simulation results show a different cooling rate at each stage. The average velocity of flow and the magnitude of the temperature difference between the blade and the fluid affect the value of the average heat transfer coefficient. The highest average heat transfer coefficient at stage 1 was 46.41 W / m2 ° C with a mass flow rate of 0.1 kg / s and 79.1 W / m2 ° C with a mass flow rate of 0.5 kg / s when using a cooling fluid in the form of steam.

Item Type:	Thesis (Masters)
Additional Information:	RTM 621.406 Suy s-1 2020 3100020085527
Uncontrolled Keywords:	Heat transfer, HP Inner Cylinder, High Pressure Turbine, Forced Cooling, Computational Fluid Dynamic (CFD)
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ263 Heat exchangers
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21101-(S2) Master Thesis
Depositing User:	suyadi suyadi
Date Deposited:	20 Nov 2025 02:52
Last Modified:	20 Nov 2025 02:52
URI:	http://repository.its.ac.id/id/eprint/75329

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