Second-law thermodynamic analysis on non-premixed counterflow methane flames with hydrogen addition

Natural gas is an attractive alternative fuel because of its environment-friendly nature, and hydrogen addition is considered as an efficient method to improve the methane combustion performance in combustion engines. In this study, the exergy destruction characteristics in non-premixed counterflow...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2020-02, Vol.139 (4), p.2577-2583
Main Authors: Liu, Yusen, Zhang, Jiabo, Ju, Dehao, Shi, Liuliu, Han, Dong
Format: Article
Language:English
Subjects:
Alternative fuels
Analysis
Analytical Chemistry
Chemical reactions
Chemistry
Chemistry and Materials Science
Combustion
Conduction heating
Conductive heat transfer
Counterflow
Destruction
Exergy
Hydrogen
Inorganic Chemistry
Irreversible processes
Laws, regulations and rules
Measurement Science and Instrumentation
Methane
Natural gas
Organic chemistry
Physical Chemistry
Polymer Sciences
Thermodynamics
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Summary:Natural gas is an attractive alternative fuel because of its environment-friendly nature, and hydrogen addition is considered as an efficient method to improve the methane combustion performance in combustion engines. In this study, the exergy destruction characteristics in non-premixed counterflow methane flames are numerically studied based on the second law of thermodynamics. The irreversible processes during combustion, such as heat conduction, mass diffusion and chemical reactions, are studied, and it is found that heat conduction is the dominant factor in exergy destruction. Additionally, the exergy destruction from each source shows two peaks, and their overall impact causes the total exergy destruction to exhibit three peaks. Moreover, the effects of hydrogen addition on exergy destruction from each source are evaluated. The effect of hydrogen addition on the exergy destruction from heat conduction is insignificant, and the exergy destruction from mass diffusion increases with hydrogen addition. For the exergy destruction from chemical reactions, the carbon-containing reactions are key to the first peak of the exergy destruction rate, whereas the H 2 -O 2 system reactions are more important for the second peak. The contribution of chemical reactions to the overall exergy destruction decreases with H 2 addition.
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-019-08583-0