THERMODYNAMICS STUDY OF FLASH-BINARY CYCLE IN THE LAHENDONG GEOTHERMAL POWER PLANT

• Main Author: GUNAWAN (NIM : 13106008); Pembimbing 1 : Dr. Ir. Ari Darmawan Pasek; Pembimbing 2 : Prof. , CHRISTIAN
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/15228
• Institution: Institut Teknologi Bandung

This study was conducted to evaluate the performance of a flash-binary cycle if applied to Geothermal Power Plant (PLTP), where the source of heat comes from the residual brine from the separator which is generally re-injected into wells. <br /> <br /> <br /> In the study of flash-binary cycle, there are four types of organic working fluids considered for the binary cycle, namely i-pentane, n-pentane, i-butane, and n-butane. <br /> <br /> <br /> Optimization process was carried out on the performance of plant systems. In order to obtain the optimum conditions that can produce the maximum net power, several components were also thermally designed in this study, such as: preheater, evaporator, and air cooled condenser. <br /> <br /> <br /> Process simulation and design of heat exchangers were carried out by HYSYS, Heat Transfer Research Inc. (HTRI) program package, and methods that existed at the Gas Processors Supplier Association (GPSA). The results showed the influence of each parameter which was varied (flash pressure, evaporator pressure, 4 pinch temperature, scale formation and type of organic working fluid) to obtain the <br /> <br /> <br /> optimum conditions required to produce the maximum net power at the Geothermal Power Plant and the main dimensions of the preheater, evaporator, and air-cooled condenser. From the study, it was concluded that i-pentane working fluid can produce a maximum net power of 3077,64 kW, in the condition of 600 kPa flash pressure, evaporator pressure of 1500,60 kPa, and 4 pinch temperature of 5 oC. Net power is <br /> <br /> <br /> obtained after considering the possibility of formation of scale on the outlet brine temperature 122oC. After the thermal design process was performed for the preheater, evaporator and air-cooled condenser, the net power of flash-binary cycle was calculated is 2991,98 kW, thermal efficiency (&#951;t) of 12,29% and the efficiency of utilization (&#951;u) is 23,06%.