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Thermodynamic Modeling of Hydrogen Production from Biomass and Evaluation of Biomass Energy Technologies

Hemmati, Shohreh | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40176 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Vossoughi, Manoochehr; Sabohi, Yadollah
  7. Abstract:
  8. Dependence on fossil fuels as the main energy sources has led to serious energy crisis and environmental problems, i.e. fossil fuel depletion and pollutant emission. Compared with fossil fuel, biomass is a clean energy with zero CO2 emission, because CO2 is fixed by photosynthesis during biomass growth and released again during utilization. Due to its low energy density, direct use of biomass is not convenient. Thus, it is necessary to convert biomass to fuel gas, such as hydrogen, which can be used cleanly and highly efficiently. One of the promising hydrogen production approaches is conversion from biomass, which is abundant, clean and renewable. Alternative thermo-chemical and biological processes can be practically applied to produce hydrogen. Thermo-chemical gasification is likely to be the most cost-effective conversion process and it is promising technology for renewable hydrogen production by utilizing biomass. So in this work biomass gasification in supercritical water that is a promising technology for hydrogen production by utilizing wet biomass, high efficiency, high capacity and … is simulated. For simulation two approaches were used. In one approach nine real biomass models as feedstock are used and in another approach glucose is taken as a model of real biomass. Then the heat recovery is considered for process and the energy efficiency is evaluated. Finally a thermodynamic equilibrium model is used to predict the chemical composition of the products of biomass gasification. The effects of temperature, pressure, feedstock concentration and amount of water on the equilibrium hydrogen yield were studied. Gibbs energy minimization approach was used to determine the product gas composition
  9. Keywords:
  10. Biomass ; Thermodynamic Modeling ; Hydrogen Producing

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