Energy and Exergy Analysis of the Modified Combine Cycle with Cooling and Humidifying Air

• Main Author: Surya Agung, Ahmad
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/40621
• Institution: Institut Teknologi Bandung

Growth in electricity demand in Indonesia will increase with the rapid increasing in amount of population and industrial needs. Percentage PLTGU in Indonesia is 25.97% supported by abundant of natural resources (gas). A power plant in Indonesia is PLTGU Tanjung Priok, North Jakarta. The thermal efficiency of power plant around 48.84% for TIT (Turbine Inlet Temperature) is 1070°C and Pr (Pressure Ratio) is 12. The design of modified combine cycle with cooling and humidifying air able to increase the thermal efficiency. Broadly speaking, there are some models of modification system. The first model is a combine cycle with addition of saturator (TMP). Model TMP divided into two variants: TMP 1 and TMP 2 consecutive full and partial humidification. The second model is a combine cycle with steam injection before entering the combustion chamber (TIU). TIU model is divided into two variants, namely models TIU 1 and TIU 2 consecutive steam derived from high and low pressure of HRSG. Simulation TMP 1 produces thermal efficiency is 46.74% and exergy destruction (E ?d) of combustion chamber is 30.5% for TIT 1070°C with Pr 12, simulation TMP 2 has thermal efficiency is 27.18% for TIT 1070°C with Pr 12 and 20% humidifying, simulation TIU 1 has thermal efficiency is 51.35% and E ?d of combustion chamber (including mixer) is 27.5% in TIT 1070°C, HR (Humidity Ratio) 0.03, and Pr 12, and simulation TIU 2 achieves thermal efficiency is 49.03% and E ?d of combustion chamber (including mixer) is 27.6% for TIT 1070°C, HR 0.03, and Pr 12. From these results, it can be concluded that the model TIU 1 has highest potential for increasing thermal efficiency.