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research-article

Second-Law Thermodynamic Analysis in Premixed Flames of Ammonia and Hydrogen Binary Fuels

[+] Author and Article Information
Jiabo Zhang

Key Laboratory for Power Machinery and Engineering, Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
zhangjiabo@sjtu.edu.cn

Anhao Zhong

Key Laboratory for Power Machinery and Engineering, Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
zhongah@sjtu.edu.cn

Zhen Huang

Key Laboratory for Power Machinery and Engineering, Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
z-huang@sjtu.edu.cn

Dong Han

Key Laboratory for Power Machinery and Engineering, Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
dong_han@sjtu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4042412 History: Received October 05, 2018; Revised December 26, 2018

Abstract

A theoretical analysis based on the second-law thermodynamics was conducted for the ammonia/hydrogen/air premixed flames at different initial pressures. The irreversibility causing exergy losses in premixed flames were divided into five parts, namely heat conduction, mass diffusion, viscous dissipation, chemical reaction and incomplete combustion, respectively. The results revealed that as hydrogen percentage in fuel blends increased from 0% to 100%, the total exergy losses decreased. Specifically, the exergy losses induced by heat conduction and mass diffusion decreased with increased hydrogen percentage. The exergy loss induced by incomplete combustion increased with hydrogen addition, as more incomplete combustion products, such as H2, H and OH, were generated with increased hydrogen percentage. The exergy loss by chemical reactions first decreased and then increased with increased hydrogen percentage, which was attributed to the combination effects of increased entropy generation rate and reduced flame thickness. Compared to the other four sources, the exergy loss induced by viscous dissipation was negligible. Furthermore, at the elevated pressure of 5 atm, the effects of hydrogen blending were similar with those at the atmospheric condition. However, the exergy losses by heat conduction and mass diffusion increased while the exergy losses by chemical reaction and incomplete combustion were both reduced, with the overall exergy loss decreased by 1-2% as the pressure increased from 1 atm to 5 atm.

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