Lukman Adi Prananto

Dry steam cycle optimization for the utilization of excess steam at Kamojang geothermal power plant

We proposed an additional unit of the geothermal power plant to harness the vacant excess steam emitted to the atmosphere in the electricity generation cycle of the Kamojang geothermal power plant, owing to high potential of thermal energy due to the vapor-domination of the steam discharged from the geothermal well. Based on the validated model calculation, the optimization of the system was carried out through the selection of variations of the gas removal system (GRS) of the non-condensable gasses (NCGs). Five GRS schemes were carried out in this study: a one-stage steam ejector, a two-stages steam ejector, a one-stage liquid ring vacuum pump (LRVP), a two-stage LRVP, and a hybrid system (ejector plus LRVP). The proposed scheme shows that one-stage LRVP system achieved the best model for the GRS in the proposed plant, generated an electric power of 15.94 MW, representing a 7.6% increase to the current 200 MW installed capacity, with a house load energy consumption of 755.18 kW.We proposed an additional unit of the geothermal power plant to harness the vacant excess steam emitted to the atmosphere in the electricity generation cycle of the Kamojang geothermal power plant, owing to high potential of thermal energy due to the vapor-domination of the steam discharged from the geothermal well. Based on the validated model calculation, the optimization of the system was carried out through the selection of variations of the gas removal system (GRS) of the non-condensable gasses (NCGs). Five GRS schemes were carried out in this study: a one-stage steam ejector, a two-stages steam ejector, a one-stage liquid ring vacuum pump (LRVP), a two-stage LRVP, and a hybrid system (ejector plus LRVP). The proposed scheme shows that one-stage LRVP system achieved the best model for the GRS in the proposed plant, generated an electric power of 15.94 MW, representing a 7.6% increase to the current 200 MW installed capacity, with a house load energy consumption of 755.18 kW.

Study of Kalina cycle as waste energy utilization system in Wayang Windu geothermal power plant

We present the study of electricity generation by utilization of the Kalina cycle system (KCS) as a bottoming cycle in the Wayang Windu geothermal power plant. The KCS converts the thermal energy from the waste brine discharged to the earth crust as a heat source. Based on the brine temperature condition, KCS 11 is the most suitable system among others owing to excellent performance at low to mid-regime temperatures. The constraints of the investigation are focused on the consideration of minimum silica saturation index (SSI) standard of the brine, owing to high SiO2 content. The system is optimized based on the most optimum ammonia-water mass ratio of the working fluid. The system can generate 1660.30 kW of electricity from 48 kg/s of unused brine with 13.20% thermal efficiency while maintaining the proper SSI standard. Owing to the nearly zero cost of heat production from the brine, this system can support the electrification of Wayang Windu geothermal power plant.We present the study of electricity generation by utilization of the Kalina cycle system (KCS) as a bottoming cycle in the Wayang Windu geothermal power plant. The KCS converts the thermal energy from the waste brine discharged to the earth crust as a heat source. Based on the brine temperature condition, KCS 11 is the most suitable system among others owing to excellent performance at low to mid-regime temperatures. The constraints of the investigation are focused on the consideration of minimum silica saturation index (SSI) standard of the brine, owing to high SiO2 content. The system is optimized based on the most optimum ammonia-water mass ratio of the working fluid. The system can generate 1660.30 kW of electricity from 48 kg/s of unused brine with 13.20% thermal efficiency while maintaining the proper SSI standard. Owing to the nearly zero cost of heat production from the brine, this system can support the electrification of Wayang Windu geothermal power plant.