THERMODYNAMICS ANALYSIS OF DOUBLE FLASH CYCLE AT THE WAYANG WINDU UNIT 1 GEOTHERMAL POWER PLANT

• Main Author: WIRAWAN (NIM : 131 06 042); Dosen Pembimbing : Prof. Dr. Ir. T.A. Fauzi Soelaiman, MSME , IRWAN
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/16111
• Institution: Institut Teknologi Bandung

This paper aims to examine technologies that can be applied at the Wayang Windu Geothermal Power Plant Unit 1 to increase capacity without drilling new wells, and only add flash separator. Hot water temperature is still between 180-190 oC at a pressure of 11.6 bar is technically still contains energy that can be extracted by using technology with the addition of flash separator (double flash). Pressure in hot water from the separator will be reduced by flasher with the isoentalphik condition to raise the quality of steam at the hot water from the separator. Water vapor mixture from flasher will pass through a separator for the separation process to separate liquid from the mixture. Steam from low pressure separator will be inserted into the low pressure turbine to increase the power from turbine. There are two cases that will be discussed in this final exam. The first case is the double flash with one turbine and the second case is double flash with two turbine. With thermodynamic calculations after optimization, the extra electricity generated after the addition of flash (double flash) on a single turbine is 3490 kW while the extra electricity generated by a bottoming cycle with the addition of flash (double flash) on double turbine is 2100 kW with low pressure separator pressure is 2.5 bar. After the addition of the flash steam separators, cooling towers is modified so that no excess water entering the cooling system to maintain constant pressure according to the design. Modification in cooling tower is done by increase height of fill and power of fan motor. After the modification, water temperature out of cooling towers decrease from 23.5 oC to 22.5 oC. In this final exam, separator is designed to separate liquid from vapor that will enter into the low pressure turbine. Separator which is designed is Weber separator.