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Simulation of the combined oxy-fuel combustion and electrolyte alka-line electrolysis for production of hydrogen

Matthias Re

Simulation of the combined oxy-fuel combustion and electrolyte alka-line electrolysis for production of hydrogen.

Rel. Massimo Santarelli, Mika Järvinen. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Energetica E Nucleare, 2021

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Carbon dioxide emissions and municipal solid waste are globally increasing, affecting the thin balance on Earth. Oxy-fuel combustion thermal power plants effectively reduce carbon dioxide emissions in the energy sector. However, carbon capture processes have a low over-all efficiency, which is a common disadvantage of this strategy. This thesis investigates the modelling using Aspen Plus of the Vantaan Energia waste-to-energy thermal power plant, taken as a reference case, to its retrofitting into a municipal solid waste oxy-fuel combustion thermal power plant with alkaline electrolysis cells. The simulation results report that the proposed design is not electrically self-sustainable, which requires an additional supply of 365.5 MWel. The electrical demand might be fulfilled by involving wind park design, which should have a nominal installed power of 1100 MW in order to smooth wind production fluctuations. The wind park installation could result in a higher cost of the system. Nevertheless, the simulation indicates the economic feasibility of the proposed municipal solid waste oxy-fuel combustion system owing to a massive produc-tion of thermal power for district heating purpose equal to 191.1 MW. The alkaline electroly-sis cells produce 278 MW of hydrogen fuel power. The oxy-fuel combustion system has an overall efficiency of 26.21%. The simulated retrofitted thermal power plant produces hydro-gen with a levelized cost of 0.851 EUR/kg. The simulated thermal power plant produces hydrogen and carbon dioxide with a ratio of 2.48:1 (H2-CO2), close to methanol production stoichiometric reaction. The reduction in hydrogen cost consecutively results in the eco-nomic feasibility of a methanol power plant, which would have a methanol selling price break-even cost of 0.221 EUR/kg. The exploitation of municipal solid waste effectively re-duces the cost of hydrogen. The proposed design is a promising strategy to cope with climate changes, by achieving carbon neutrality, as well as to produce cheap and clean hydrogen.

Relators: Massimo Santarelli, Mika Järvinen
Academic year: 2021/22
Publication type: Electronic
Number of Pages: 88
Corso di laurea: Corso di laurea magistrale in Ingegneria Energetica E Nucleare
Classe di laurea: New organization > Master science > LM-30 - ENERGY AND NUCLEAR ENGINEERING
Ente in cotutela: AALTO UNIVERSITY OF TECHNOLOGY - School of Engineering (FINLANDIA)
Aziende collaboratrici: Aalto University
URI: http://webthesis.biblio.polito.it/id/eprint/19966
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