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ABSTRACT
The present article systematically investigates the laminar explosion behaviors of syngas with wider ranges of fuel concentrations (0.4 ~ 3.0 in equivalence ratio) and composition fractions (30%~70% in volume fraction ratio of H2 in syngas) in a 28.73-L spherical vessel. The temporal traces of explosion overpressure and the variations of four essential explosion indices (maximum explosion pressure, explosion duration, peak pressure rise rate, and deflagration index) have been studied, the influencing factors and mechanism have been analyzed and discussed. The influences mechanism of composition and concentration on maximum explosion pressure are discussed from the viewpoint of heat loss to the vessel wall. The correlation of explosion duration to laminar burning velocity has also been discussed, the result indicates that the correlation is mainly determined by fuel composition when the burning velocity beyond certain level. The critical equivalence ratio for peak pressure rise rate in syngas explosion is determined by the maximum pressure for H2-enriched syngas but it is determined by explosion duration for CO-enriched syngas. Furthermore, the safety issues about syngas are also discussed upon deflagration index.
Acknowledgments
Sincere thanks to Dr WANG Chao (Dalian University of Technology) for his helps on preparing experiments when he studied at Beijing Jiaotong University as my student. Sincere thanks to Dr XIE Yong-Liang (Southwest Jiaotong University), Miss WANG Wei-Qing (Beijing Jiaotong University), and Miss WANG Han-Yu (Zhejiang University) for their helps on the related revisions. Sincere thanks also to all the editors and all the reviewers for their works on this article.