Thermodynamics Irreversibilities Analysis of Oxy-Fuel Diffusion Flames: The Effect of Oxygen Concentration

• Published in: Entropy (Basel, Switzerland) Vol. 24; no. 2; p. 205
• Main Authors: Yan, Huibo, Tang, Guangtong, Wang, Chaoyang, Li, Lujiang, Zhou, Yuanke, Zhang, Zhongnong, Lou, Chun
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 28.01.2022; MDPI
• Subjects: Carbon dioxide; Chemical reactions; Combustion; Communication; Conduction heating; Conductive heat transfer; Diffusion effects; Diffusion flames; Efficiency; Energy utilization; Entropy; entropy generation; Flue gas; Gases; Heat; hydrocarbon diffusion flame; Numerical analysis; Oxidizing agents; Oxy-fuel; oxy-fuel combustion; Oxygen; Radiation; Thermodynamics; thermodynamics irreversibility; thermodynamics irreversibility; entropy generation; oxy-fuel combustion; hydrocarbon diffusion flame
• ISSN: 1099-4300; 1099-4300
• DOI: 10.3390/e24020205

In studies on the combustion process, thermodynamic analysis can be used to evaluate the irreversibility of the combustion process and improve energy utilization efficiency. In this paper, the combustion process of a laminar oxy-fuel diffusion flame was simulated, and the entropy generation due to the irreversibilities of the radiation process, the heat conduction and heat convection process, the mass diffusion process, and the chemical reaction process was calculated. The effect of the oxygen concentration in the oxidizer on the entropy generation was analyzed. The results indicated that, as the oxygen concentration in the oxidizer increases, the radiative entropy generation first increases and then decreases, and the convective and conductive entropy generation, the mass diffusion entropy generation, the chemical entropy generation, and the total entropy generation gradually increase.