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Research Papers

An Experimental Data Based Correction Method of Biomass Gasification Equilibrium Modeling

[+] Author and Article Information
L. Damiani

 DIMSET–University of Genoa, Via Montallegro 1, 16145, Genoa, Italylorenzo.damiani@unige.it

A. Trucco

 DIMSET–University of Genoa, Via Montallegro 1, 16145, Genoa, Italytrucco1@unige.it

J. Sol. Energy Eng 132(3), 031011 (Jun 21, 2010) (11 pages) doi:10.1115/1.4001463 History: Received June 16, 2009; Revised December 18, 2009; Published June 21, 2010; Online June 21, 2010

This paper presents a modified equilibrium simulation model for biomass gasification performance prediction. The model, implemented in the MATLAB-SIMULINK ® environment, is able to calculate the reactor main operating parameters such as reaction temperature, gas composition, gas flow rate and solid product (typically charcoal). The comparison of model output with experimental data puts in evidence the insufficient precision of equilibrium models due to their incapability of taking into account the nonequilibrium effects always present in the gasification process. To obtain a better prediction of measured values, the pure equilibrium model has been modified on the basis of literature experimental data, introducing semi-empirical relations with the aim to consider the most meaningful effects of nonequilibrium. The results demonstrate that this modification leads to an increased precision of the model in reproducing experimental data.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

The CHO triangular diagram

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Figure 2

Representation of the heterogeneous, homogeneous and limit conditions for a CHOI system on the triangular diagram. (a) Representation of the carbon deposition boundary (solid line) for the CHOI system. (b) Representation of the pseudocarbon deposition boundary (dashed line) for the homogeneous CHOI system.

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Figure 3

Logical scheme of the simulation model

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Figure 4

The loop scheme of the simulation model, complete of energy balance block

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Figure 5

Scheme of the model complete of nonequilibrium correction streams

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Figure 6

Char yield in function of A/F ratio for EQ and MOD and EXP

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Figure 7

Reaction temperature in function of A/F ratio for EQ and MOD for 5% and 10% moisture content and EXP

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Figure 8

Comparison of the EQ and MOD models with the experimental data for H2O and N2

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Figure 9

Comparison of equilibrium and modified models with experimental data for CO2 and CO

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Figure 10

Comparison of equilibrium and modified models with experimental data for H2 and CH4

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Figure 11

Dry and wet gas LHV calculated by equilibrium and modified models in function of A/F ratio

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Figure 12

Comparison of reactor power output for equilibrium and modified models

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Figure 13

Comparison of reactor cold gas efficiency for equilibrium and modified models

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Figure 14

Results of simulation No. 1 (A/F=2.37). Upper diagram: comparison between experimental and modeled gas composition. Lower diagram: calculated lower heating values.

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Figure 15

Results of simulation No. 2 (A/F=1.86). Upper diagram: comparison between experimental and modeled gas composition. Lower diagram: calculated lower heating values.

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