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Research Papers: Energy From Biomass

Thermodynamic Equilibrium Model and Exergy Analysis of a Biomass Gasifier

[+] Author and Article Information
T. Srinivas1

School of Mechanical and Building Sciences, VIT University, Vellore 632 014, Indiasrinivastpalli@yahoo.co.in

A. V. S. S. K. S. Gupta

Department of Mechanical Engineering, JNT University, Hyderabad 500 081, India

B. V. Reddy

Department of Mechanical Engineering, University of Ontario Institute of Technology, Oshawa, ON, L1H 7K4, Canada

1

Corresponding author.

J. Energy Resour. Technol 131(3), 031801 (Aug 20, 2009) (7 pages) doi:10.1115/1.3185354 History: Received April 15, 2008; Revised May 10, 2009; Published August 20, 2009

Biomass gasification involves the production of a gaseous fuel by partial oxidation of a solid fuel. Clean synthesis (syn) gas, produced from partial combustion of biomass, can be burnt in a gas turbine combustion chamber to run a biomass based combined cycle power plant. A thermochemical model has been developed to predict the gas composition and performance of a biomass gasifier based on thermodynamic equilibrium concept for different biomass materials. A simplified numerical method is applied to solve the thermochemical equilibrium reactions. The system consists of a pressurized circulating fluidized bed to produce the syn gas from the biomass. The effect of the relative air fuel ratio (RAFR), steam fuel ratio (SFR), and gasifier pressure has been examined on the gas composition, gasifier temperature, lower heating value of syn gas, and exergy efficiency of biomass gasifier to obtain a high yield from the biomass. It has been found that at lower values of RAFR and SFR, the heating value of the syn gas and the exergy efficiency of gasifier is high.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 5

Exergy efficiency of gasifier as a function of (a) RAFR, (b) SFR, and (c) gasifier pressure for different biomass fuels

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Figure 1

Schematic flow diagram of a biomass gasifier along with power generation and heat recovery steam generator system

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Figure 2

Dry syn gas species concentrations as a function of (a) RAFR, (b) SFR, and (c) gasifier pressure for different biomass fuels

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Figure 3

Gasifier temperature as a function of (a) RAFR, (b) SFR, and (c) gasifier pressure for different biomass fuels

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Figure 4

Syn gas LHV as a function of (a) RAFR, (b) SFR, and (c) gasifier pressure for different biomass fuels

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