Optimization of Prefill Mode to Increase Reliability of Gas Turbin 13E21 PT. PJB UP Muara Tawar

Muara Tawar block V is constructed by PT. PLN (Persero) Power Plant Master Project of Java, Bali and Nusa Tenggara Networks based on contract No. 261. PJ / 041 / DIR / 2007 (Concerning Gas Fired Power Plant Extension Project). The plant use gas turbine type 13E2. Operational concept of gas turbine type 13E2 is regulating the amount of fuel that is divided from three fuel control valves and the operating pattern is in an area known as the pilot valve and premix valve which must be maintained stability of combustion shown by pulsation parameters. The prefill concept is used to avoid flame off when gas turbine loading often passes over point switch or back point switch. Prefill itself will momentary activate a pilot valve to fill the Fuel Distribution System (FDS) line from MBP43. However, prefill gives effect of high pulsation that trigger Gas Turbine experiencing PLS or derating. This effect can be overcome by improving the prefill concept and modifying the prefill system through Logic Advant, resulting in a more stable burning in the gas turbine burner.