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Research Papers

# Measurements of the Laminar Burning Velocities for Typical Syngas–Air Mixtures at Elevated Pressures

[+] Author and Article Information
Eliseu Monteiro

CITAB,  University of Trás-os-Montes, Alto Douro, Portugal

Abel Rouboa1

CITAB, University of Trás-os-Montes, Alto Douro, Portugal; CITAB-UTAD/MEAM Department,  University of Pennsylvania, 229 Towne Building, 220 South 33rd Street, Philadelphia, PA-19104-6391rouboa@seas.upenn.edu

1

Corresponding author.

J. Energy Resour. Technol 133(3), 031002 (Sep 06, 2011) (6 pages) doi:10.1115/1.4004607 History: Received January 15, 2011; Revised June 14, 2011; Published September 06, 2011; Online September 06, 2011

## Abstract

In the currently reported work, three typical mixtures of H2 , CO, CH4 , CO2 , and N2 have been considered as representative of the producer gas (syngas) coming from biomass gasification. Syngas is being recognized as a viable energy source worldwide, particularly for stationary power generation. However, there are gaps in the fundamental understand of syngas combustion characteristics, especially at elevated pressures that are relevant to practical combustors. In this work, constant volume spherical expanding flames of three typical syngas compositions resulting from biomass gasification have been employed to measure the laminar burning velocities for pressures ranges between 1.0 and 20 bar tanking into account the stretch effect on burning velocity. Over the ranges studied, the burning velocities are fit by a functional form $Su=Su0(T/T0)α(P/P0)β$; and the dependencies of α and β upon the equivalence ratio of mixture are also given. Conclusion can be drawn that the burning velocity decreases with the increase of pressure. In opposite, an increase in temperature induces an increase of the burning velocity. The higher burning velocity value is obtained for downdraft syngas. This result is endorsed to the higher heat value, lower dilution and higher volume percentage of hydrogen in the downdraft syngas.

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## Figures

Figure 1

Pressure versus time for syngas-air mixtures: (a) draft; (b) downdraft; and (c) fluidized bed

Figure 2

Burning velocity versus pressure for updraft syngas-air mixture at various equivalence ratios

Figure 3

Burning velocity versus pressure for downdraft syngas-air mixture at various equivalence ratios

Figure 4

Burning velocity versus pressure for fluidized bed syngas-air mixture at various equivalence ratios

Figure 5

Stretch rate versus pressure for syngas-air mixtures: (a) Updraft, (b) downdraft, and (c) fluidized bed

Figure 6

Evolution of the reference laminar flame speed as a function of the equivalence ratio

Figure 7

Comparison between experimental and correlated burning velocities of stoichiometric syngas-air mixtures. (a) Updraft; (b) downdraft; and (c) fluidized bed

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