Development of a combined flash and binary geothermal system integrated with hydrogen production for blending into natural gas in daily applications


Energy Conversion and Management, vol.227, 2021 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 227
  • Publication Date: 2021
  • Doi Number: 10.1016/j.enconman.2020.113501
  • Journal Name: Energy Conversion and Management
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Applied Science & Technology Source, CAB Abstracts, Communication Abstracts, Computer & Applied Sciences, Environment Index, INSPEC, Pollution Abstracts, Veterinary Science Database, Civil Engineering Abstracts
  • Keywords: Geothermal energy, Hydrogen, Efficiency, Electrolyzer, Exergy, Natural gas, ORGANIC RANKINE-CYCLE, THERMOECONOMIC ANALYSIS, POWER-PLANT, ENERGY, EXERGY, NETWORKS, DRIVEN, WATER
  • Yıldız Technical University Affiliated: Yes


© 2020 Elsevier LtdThis paper concerns a novel integrated system for geothermal-based power and hydrogen generation and blending of hydrogen into natural gas to feed household devices, such as gas stove and combi boiler. The system includes a combined flash and binary geothermal subsystem, an alkaline electrolyzer, a blending unit and a combustion reactor. The design and modelling of the proposed system are conducted with Aspen Plus software. The overall energy and exergy efficiencies of the investigated system are found to be 46.8% and 77.9%, respectively. The highest exergy efficiency belongs to January as 86.63% when the average ambient temperature is 5.8 °C, while the lowest exergy efficiency belongs to July as 76.98% when the average ambient temperature is 27.2 °C in Denizli, Turkey. The hydrogen fraction into natural gas is changed from 0% to 20% and analysed the combustion of the blend. The results show that syngas composition has higher oxygen output rate and lower carbon dioxide, steam and heat release rates with higher hydrogen addition.