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combustion Irreversibilities: Numerical Simulation and Analysis

Journal of Thermal Science 2012年第4期21卷 377-383页

作者： Valter Silva Abel Rouboa CITAB/Engineering Department School of Science and Technology of University of U TAD Mechanical Engineering and Applied Mechanics Department University of PennsylvaniaPhiladelphia

An exergy analysis was performed considering the combustion of methane and agro-industrial residues produced in Portugal (forest residues and vines pruning). Regarding that the irreversibilities of a thermodynamic process are path dependent, the combustion process was considering as resulting from different hypothetical paths each one characterized by four main sub-processes: reactant mixing, fuel oxidation, internal thermal energy exchange (heat transfer), and product mixing. The exergetic efficiency was computed using a zero dimensional model developed by using a Visual Basic home code. It was concluded that the exergy losses were mainly due to the internal thermal energy exchange sub-process. The exergy losses from this sub-process are higher when the reactants are preheated up to the ignition temperature without previous fuel oxidation. On the other hand, the global exergy destruction can be minored increasing the pressure, the reactants temperature and the oxygen content on the oxidant stream. This methodology allows the identification of the phenomena and processes that have larger exergy losses, the understanding of why these losses occur and how the exergy changes with the parameters associated to each system which is crucial to implement the syngas combustion from biomass products as a competitive technology.

关键词： Exergy combustion paths combustion sub-processes Exergetic efficiency Visual Basic Syngas

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