Life cycle cost analysis of combined flash binary geothermal plant and integrated hydrogen generation system

摘要

The aim of this study is to investigate, optimize and analyze the life cycle cost of a system thermodynamically modeled in a computer environment using thermodynamic and economic methods in a comprehensive way for the use of geothermal energy in hydrogen production. In this study, a liquid geothermal resource is used for electricity generation and this electricity is used as a work input in the electrolysis unit to split of water into the hydrogen and oxygen. When the necessary thermodynamic assumptions are made and the system is run in a computer environment with a simulation program, the maximum net work is calculated to be 8063 kW from the geothermal power plant. The unit energy cost of electricity is calculated to be 0.0107 $/kWh. Hydrogen production from the system is calculated to be 0.053 kg/s as the produced electricity is used directly to produce hydrogen in the electrolysis unit. The unit cost of produced hydrogen is calculated to be 2.767 $ / kg H-2. As a result of the life cycle cost analysis of the system, Net Present Value (NPV) is calculated to be 35.340.000 $. The levelized annual cost with the annual cost method (LAC) is calculated to be 3.395.000 $/yr. Simple payback period (N-sbp) of the system is calculated to be 4.047 year and disconut payback period (N-dbp) is calculated to be 5.442 years, respectively.