Energy and Exergy Analysis of High Temperature Agent Gasification of Biomass

Yueshi Wu, Weihong Yang and Wlodzimierz Blasiak
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Yueshi Wu: Division of Energy and Furnace Technology, Department of Material Science and Engineering, School of Industrial Engineering and Management, KTH-Royal Institute of Technology, Brinellvägen 23, 10044 Stockholm, Sweden
Weihong Yang: Division of Energy and Furnace Technology, Department of Material Science and Engineering, School of Industrial Engineering and Management, KTH-Royal Institute of Technology, Brinellvägen 23, 10044 Stockholm, Sweden
Wlodzimierz Blasiak: Division of Energy and Furnace Technology, Department of Material Science and Engineering, School of Industrial Engineering and Management, KTH-Royal Institute of Technology, Brinellvägen 23, 10044 Stockholm, Sweden

Energies, 2014, vol. 7, issue 4, 1-16

Abstract: A chemical equilibrium model was developed to predict the product composition of a biomass gasification system using highly preheated air and steam. The advantages and limitations of this system were discussed from a thermodynamic viewpoint. The first and second law analyses have been conducted for various preheating temperatures and steam/biomass mass (S/B) ratios. The results demonstrated that the chemical energy output of the produced syngas is highest when the S/B ratio is 1.83 under the conditions used in this study. However, higher S/B ratios have a negative effect on the energy and exergy efficiencies. Higher preheating temperatures increase the chemical energy of the produced syngas and the two efficiencies. The peak values for the energy and exergy efficiencies are 81.5% and 76.2%, respectively. Based on the calculated limitation values, where the highest chemical energy (exergy) of the produced syngas and maximum achievable efficiencies are determined, a thermodynamically possible operating region is suggested.

Keywords: biomass gasification; high temperature agent; Aspen model; exergy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2014
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (19)

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