ANALYSIS OF OPENED SCOOP AND CLOSED SCOOP TYPE COMBUSTOR APPLIED ON GAS TURBINE MW 701D

• Main Author: Tongam Samosir, Mangihut
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/38831
• Institution: Institut Teknologi Bandung

The increasing price of fuel oil nowadays resulted in high electricity cost of production, Power plant operators try to find alternative and cheaper fuels to reduce the cost of production. PLTGU Grati has the opportunity to reduce costs of production due to it was designed to operate using two choices of fuel i.e. fuel oil (HSD) or natural gas fuel. In September 2009, PLTGU Grati has obtained supplies of natural gas fuel, they are adequate only for three of the six turbine units in PLTGU Grati. Therefore fuel oil is still used for the operation of PLTGU Grati. In the operation of gas turbines, the role of combustor is very since the performance of a combustor will affect the performance and life time of gas turbines. PLTGU Grati has two choices of combustor types, i.e. closed scoop type and opened scoop type and also have two options of fuel types in operating its gas turbines. This thesis discusses the options for operating the PLTGU Grati’s turbines and aims to do performance analysis of both types of the combustor using either oil or natural gas. One of the alternatives in analyzing the effect of different types of combustor is using Computational Fluid Dynamics software (CFD). The combustor parameters evaluated in this thesis are combustor exit temperature profile and the temperature distribution inside chamber. The results of the temperature distribution analysis show that is opened scoop combustor is better than closed scoop type because the flame not directly in contact with the combustor wall of the opened scoop combustor. This can occur because the flame tends to be covered by the air that comes out from six scoops. As the results of the CFD analysis, a combustor exit temperature profile was 1.11 for the closed scoop combustor and 1.13 for the opened scoop combustor when using natural gas. Whereas if combustor operated with oil fuel, the temperature profile was 1.41 for closed scoop combustor and 1.45 for opened scoop combustor. From the average exit temperature analysis of the combustor, the temperature value for the type of scoop opened is lower than the closed type scoop. Therefore from the temperature profile aspect the closed scoop combustor is better than opened scoop combustor.