Energy and exergy analysis of dry-steam geothermal power plant: Case study in kamojang geothermal power plant unit 2

Nova Dany Setyawan,Mert Gürtürk,Reza Adiprana,Frandhoni Utomo,Nugroho Agung Pambudi,Bayu Rudiyanto,Herman Saputro,Lip Huat Saw,Ade Gafar Abdullah,Asep Bayu Dani Nandiyanto

doi:10.1051/matecconf/201819708018

Abstract

The Government of Indonesia is committed to realize a policy of 35,000 Megawatt (MW) of an additional supply of electricity within 5 years (2014-2019). The projection of this capacity is largely supported by fossil fuel power plants and a small portion of renewable energy. One of the renewable energy which currently has great potential in Indonesia is the geothermal. Therefore, improving the capacity of geothermal is needed to support the policy. The Kamojang is one of the largest geothermal power plant in Indonesia with an installed capacity of 235 MW from 5 generating units. The purposes of this research is to calculate the energy and exergy analysis at Kamojang geothermal power plant. To improve the capacity, exergy analysis can be used by employing the thermodynamic method. In this research, unit 2 of Kamojang's plant is employed. The analysis was examined by using the Engineering Equation Solver (EES) code. The results show the first law of efficiency was calculated at 19.03% and the second law of efficiency at 40.31%.

Highlights

The Government of Indonesia is committed to realize the supply of electricity amounting to 35,000 Megawatts (MW) within 5 years (2014-2019)
Referring to the geothermal investigation conducted by Geological Agency, it has been identified as many as 312 geothermal potential points until 2013 [1]
The data required in this research are the steam flow rate, temperature and pressure at each state, environmental temperature, power plant power, and other data needed to support the implementation of this research

Summary

Introduction

The Government of Indonesia is committed to realize the supply of electricity amounting to 35,000 Megawatts (MW) within 5 years (2014-2019) This projection is largely covered by the fossil fuel power plants, such as coal and gas. A. (2016) steam consumption at unit 2 plant in Indonesia Power increased from 240 ton / hour to 350 ton / hour [6]. This is due to the age of the plant which leads to a decrease in the component’s performance, resulting in energy losses in the system. The objective of this study is using exergy analysis in evaluating and optimizing unit 2’s geothermal power plant in Kamojang. The evaluation and optimization calculations will be performed using the Engineering Equation Solver (EES) code

Method

Unit 2 kamojang plant

Energy and exergy’s system analysis

Grassman Diagram and analysis performance

Conclusions