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Thermodynamic modeling for hydrogen production from biomass and evaluation of biomass energy technologies

Hemmati, Sh ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. Publisher: 2010
  3. Abstract:
  4. Compared with fossil fuel, biomass is a clean energy with zero CO 2 emission, because CO 2 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 in fuel cell. 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. Biomass gasification produces a mixture of gases (mainly consisting of H 2, CO, CO 2, CH 4 and higher hydrocarbons), solids (char) and liquids (aromatic hydrocarbons) known as 'tars'. The relative proportion of each constituent depends on the operating conditions such as temperature, pressure, type of gasifying medium, biomass type; biomass feed rate, heating rate, flow rate of gasifying medium, physical characteristics of biomass such as particle size, shape, surface area to volume ratio and the gasifier design. So far various experimental investigations into gasification of biomass carried out, but the work on thermodynamic analysis is relatively limited. Thermodynamic analysis is very helpful in providing theoretical guidance for optimization of design and operation of biomass gasification system. So, in this work a thermodynamic equilibrium model was used to predict the chemical composition of the products of biomass gasification. Gibbs energy minimization approach was used to determine the product gas composition. The code of MATLAB software was used. Gasifier, the most critical component of any biomass gasification system, was modeled as an equilibrium reactor. Equilibrium calculations were compared with experimental data from literature. Finally investigation of evaluation of biomass energy technologies carried out
  5. Keywords:
  6. Modeling ; Thermodynamic ; Biomass energy technologies ; Biomass Gasification ; Biomass gasification system ; Biomass growth ; Chemical compositions ; Clean energy ; Conversion process ; Critical component ; Design and operations ; Direct use ; Energy ; Equilibrium calculation ; Experimental data ; Experimental investigations ; Feed-rates ; Fuel gas ; Gasifiers ; Gasifying medium ; Gibbs energy minimization ; Higher hydrocarbons ; Low energies ; Matlab- software ; Operating condition ; Physical characteristics ; Product gas ; Renewable hydrogen production ; Surface area ; Thermo dynamic analysis ; Thermo-chemical ; Thermodynamic equilibrium model ; Thermodynamic modeling ; Volume ratio ; Carbon dioxide ; Fossil fuels ; Gasification ; Hydrocarbons ; Hydrogen ; Hydrogen production ; Models ; Polymer blends ; Thermoanalysis ; Thermodynamic properties ; Thermodynamics ; Biomass
  7. Source: Biotechniques for Air Pollution Control - Proceedings of the 3rd International Congress on Biotechniques for Air Pollution Control, 28 September 2009 through 30 September 2009, Delft ; 2010 , Pages 269-273 ; 9780415582704 (ISBN)
  8. URL: http://www.crcnetbase.com/doi/abs/10.1201/b10563-57