FAILURE ANALYSIS ON CONE BURNER ANNULAR COMBUSTOR GAS TURBINE TYPE ABB-GT13E2 IN GILIMANUK POWER PLANT AND ALTERNATIVE ABATEMENT

• Main Author: G.A.N.SUBAWA PUTRA (NIM : 23108324); Tim Pembimbing : Dr. Ir. Toto Hardianto; Dr. Ir. Iman K. Re, I
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/15983
• Institution: Institut Teknologi Bandung

Gilimanuk gas turbine power plant using ABB type GT13E2. One of the problems experienced by PLTG Gilimanuk is damage to the components of Hot Gas Path (HGP) in particular damage to the burner where the actual life time is less than its recommended lifetime (24,000 EOH repairable). Failure on the annular combustor burner cone Gas Turbine ABB Type GT13E2 analyzed from two sides ie from the thermodynamic and strengthened in terms of material failure analysis. Thermodynamic analysis will analyze the process of combustion in the combustion chamber with the geometry modeling and simulation of combustion processes with variations of the mass flow of fuel and air with the help of fluent software. This simulation is used to determine the temperature distribution in the combustion chamber for the analysis of material failure on the burner cone. Analysis of the failure cone burner with failure analysis through metallurgical testing to validate the results of simulations conducted. Countermeasures suggested as an alternative form of solution to the problems that are not repeated. From the simulation results with results obtained using the program fluent cone burner wall temperature of 816 oC. This temperature is still above the temperature of 650 oC carburization, so the burner cone materials undergo a process carburization causing material failure. Failure analysis on the cone burner with a method of failure analysis and metallurgical testing results obtained that the cause of material failure is due carburization burner cone, namely the entry of carbon from the environment into the material. Carbon will be compounds with Cr, Fe, Mo, W to form complex carbides. Source of carbon from the environment is the result of imperfect combustion in the turbine combustion chamber. Material Hastelloy carburization can be attacked if it works temperatures above 650 oC. There are three ways you can do to avoid the occurrence of carburization on the burner cone, namely the use of a layer (coating) material repair, replacement and decreasing burner cone temperature. Judging from the economic aspect, the losses incurred due to derating of 12.45% is Rp. 134.612.104.954 whereas if you do repair to the burner cone issued a fee of Rp. 2.880.000.000. So it is still more profitable to do repair than lower cone burner wall temperature to below 650 oC.