Development and analysis of the novel hybridization of a single-flash geothermal power plant with biomass driven sco2-steam rankine combined cycle


Entropy, vol.23, no.6, 2021 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 23 Issue: 6
  • Publication Date: 2021
  • Doi Number: 10.3390/e23060766
  • Journal Name: Entropy
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Communication Abstracts, INSPEC, Metadex, zbMATH, Directory of Open Access Journals, Civil Engineering Abstracts
  • Keywords: hybridization, single-flash, geothermal, biomass, sCO(2) cycle, olive residue, flexibility, SUPERCRITICAL CO2, WASTE HEAT, PERFORMANCE ANALYSIS, OPTIMIZATION, GENERATION, EFFICIENCY, INCREASE
  • Middle East Technical University Affiliated: Yes


© 2021 by the authors. Licensee MDPI, Basel, Switzerland.This study investigates the hybridization scenario of a single-flash geothermal power plant with a biomass-driven sCO2-steam Rankine combined cycle, where a solid local biomass source, olive residue, is used as a fuel. The hybrid power plant is modeled using the simulation software EBSILON®Professional. A topping sCO2 cycle is chosen due to its potential for flexible electricity generation. A synergy between the topping sCO2 and bottoming steam Rankine cycles is achieved by a good temperature match between the coupling heat exchanger, where the waste heat from the topping cycle is utilized in the bottoming cycle. The high-temperature heat addition problem, common in sCO2 cycles, is also eliminated by utilizing the heat in the flue gas in the bottoming cycle. Combined cycle thermal efficiency and a biomass-to-electricity conversion efficiency of 24.9% and 22.4% are achieved, respectively. The corresponding fuel consumption of the hybridized plant is found to be 2.2 kg/s.