Thermoeconomic appraisal of a novel power and hydrogen cogeneration plant with integration of biomass and geothermal energies

• Published in: International journal of hydrogen energy 2024-01, Vol.52, p.385-400
• Main Authors: Wang, Dan, Ali, Masood Ashraf, Alizadeh, As'ad, Singh, Pradeep Kumar, Almojil, Sattam Fahad, Alali, Abdulrhman Fahmi, Almoalimi, Khaled Twfiq, Almohana, Abdulaziz Ibrahim
• Format: Article
• Language: English
• Subjects: Biomass energy; Economic; Exergo-environmental; Geothermal energy; Power/hydrogen co-generation
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2023.02.066

The present research aims at development and design of a new high-efficiency power/hydrogen co-production framework running by biomass/geothermal renewable resources. In this regard, to attain global energy transition goals based on green hydrogen utilization of renewable resources instead of conventional fossil fuel-based routes for hydrogen production is followed. The proposed system structure consists mainly of a gas turbine coupled to a geothermal assisted Rankine unit which extracts the gas turbine wasted heat to run a water electrlyzer for H2 production. To illustrate a comprehensive performance evaluation, technical (thermodynamic), environmental and economic aspects are considered and assessed. Eight performance indices are evaluated including: power and hydrogen productions, thermal and exergetic efficiencies, environmental damage and emission index, LCOP and overall system cost. In addition, a bi-objective optimization is implemented with respect to efficiency and product cost. Results show that, the cogeneration framework under optimum condition, operates with exergetic efficiency of 42.37% and levelizedproductcostof68.52$/MWh, whose emitted CO2 is 0.7443kg/kWh. Also, compared to basic design point conditions, it is found out that optimization leads to performance enhancements by 7.5%, 9.0% and 7.7% for the three mentioned indicators, respectively. •Proposal of power/hydrogen cogeneration structure driven by biomass-geothermal energies.•Thermodynamic, environmental and economic evaluations for proposed hybrid structure.•Determination of optimum operation via two-objective optimization.•AcHieving 9.0% reduction in levelized product cost by optimization.