An Investigation of Fuel Mixing and Reaction in a CH4/Syngas/Air Premixed Impinging Flame with Varied H2/CO Proportion

For industrial applications, we propose a concept of clean and efficient combustion through burning syngas on an impinging burner. We performed experimental measurements of particle image velocimetry, OH radical (OH*) chemiluminescence, flame temperature, and CO emission to examine the fuel mixing a...

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Bibliographic Details
Published in:Energies (Basel) 2017-07, Vol.10 (7), p.900
Main Authors: Chiu, Chih-Pin, Yeh, Szu-I, Tsai, Yu-Ching, Yang, Jing-Tang
Format: Article
Language:English
Subjects:
Biogas
Carbon monoxide
CO emission
Counterflow
Energy
Free radicals
fuel mixing
Fuel-air mixing
Heat transfer
Hydrocarbons
Hydrogen
impinging flame
Investigations
Iron oxides
Methane
OH radical chemiluminescence
Radiation
Raw materials
reaction
syngas
Synthesis gas
Thermocouples
Velocity
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Summary:For industrial applications, we propose a concept of clean and efficient combustion through burning syngas on an impinging burner. We performed experimental measurements of particle image velocimetry, OH radical (OH*) chemiluminescence, flame temperature, and CO emission to examine the fuel mixing and reaction of premixed impinging flames of CH4/syngas/air with H2/CO in varied proportions. The velocity distribution of the combustion flow field showed that a deceleration area in the main flow formed through the mutual impingement of two jet flows, which enhanced the mixing of fuel and air because of an increased momentum transfer. The deceleration area expanded with an increased CO proportion, which indicated that the mixing of fuel and air also increased with the increased CO proportion. Our examination of the OH* chemiluminescence demonstrated that its intensity increased with increased CO proportion, which showed that the reaction between fuel and air accordingly increased. CO provided in the syngas hence participated readily in the reaction of the CH4/syngas/air premixed impinging flames when the syngas contained CO in a large proportion. Although the volume flow rate of the provided CO quadrupled, the CO emission increased by only 12% to 15%. The results of this work are useful to improve the feasibility of fuel-injection systems using syngas as an alternative fuel.
ISSN:1996-1073
1996-1073
DOI:10.3390/en10070900