Experimental and kinetic study on laminar flame speeds of ammonia/syngas/air at a high temperature and elevated pressure

Abstract

The laminar flame speeds of ammonia mixed with syngas at a high pressure, temperature, and different syngas ratios were measured. The data obtained were fitted at different pressures, temperatures, syngas ratios, and equivalence ratios. Four kinetic models (the Glarborg model, Shrestha model, Mei model, and Han model) were compared and validated with experimental data. Pathway, sensitivity and radical pool analysis are conducted to find out the deep kinetic insight on ammonia oxidation and NO formation. The pathway analysis shows that H abstraction reactions and NH_i combination reactions play important roles in ammonia oxidation. NO formation is closely related to H, OH, the O radical produced, and formation reactions. NO is mainly formed from reaction, HNO+ H= NO+ H₂. Furthermore, both ammonia oxidation and NO formation are sensitive to small radical reactions and ammonia related reactions.

Graphical abstract

Keywords

ammonia mixed with syngas / laminar flame speed / kinetic model / sensitivity analysis / pathway analysis

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Acknowledgments

This study is supported by the National Natural Science Foundation of China (52106182), the National Science and Technology Major Project (2019-III-0018-0062), and Chinese Postdoctoral Science Foundation (2021M692537). The supports from the State Key Laboratory of Engines at Tianjin University (K2021-02) and Key Laboratory for Thermal Science and Power Engineering of Ministry of Education in Tsinghua University are also appreciated.

Electronic Supplementary Material

Supplementary material is available in the online version of this article at https://doi.org/10.1007/s11708-021-0791-7 and is accessible for authorized users.

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