Open AccessStudy of Potential of Cascade Direct Use to Utilize Exhaust Steam from Back Pressure Turbine at Ulumbu Geothermal Power Plant
Author(s) -
Azaria Haykal Ahmad,
Aby Lafkin,
Sholihah R. Utami,
Nur Hasyyati Luqiyana,
Fadhil Karunia Hammad,
Rian Andriana,
Jooned Hendrarsakti
Publication year - 2022
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/1014/1/012009
Subject(s) - geothermal energy , geothermal power , geothermal gradient , engineering , steam electric power station , turbine , environmental science , steam turbine , power station , environmental engineering , waste management , mechanical engineering , combined cycle , electrical engineering , geophysics , geology
The Indonesian government has fixated Flores Island for geothermal utilization due to its potential to reach about 776 MW. Of these potentials, one that has been utilized is at PLTP Ulumbu with a 10 MW energy reservation. 2 backpressure units at PLTP Ulumbu generate power 2×2.5 MW. The exhaust on the backpressure unit of the PLTP Ulumbu has an average temperature of 99°C with enthalpy ranging from 2,430 to 2,435 kJ/kg. Instead of releasing the steam to the environment, it would be wiser to utilize the brine’s heat through cascade direct use based on Lindal Diagram. The cascading system will be arranged from high to low temperature to use excessive energy efficiently. The direct use application is selected based on the best potential-for-fit commodities and the energy of the heat source. This paper aims to perform a feasibility study of cascade direct use of geothermal energy that uses an exhaust steam backpressure turbine at Ulumbu geothermal power plant. The Ulumbu area will be transformed as the center of agricultural, stockbreeding, factory, and geothermal tourism. From potential commodities, the four applications selected are coffee bean drying, egg-hatching incubator, brick factory, and new tourism site. Additionally, several preliminary scenarios are available regarding plant development components (e.g., stakeholder and partnership type). Hence, the comprehensive determination of the ‘best scenario’ will be discussed in terms of feasibility and economic attractiveness.