Effects of hydrogen addition on propagation characteristics of premixed methane/air flames. (March 2015)

• Record Type: Journal Article
• Authors: Yu, Minggao; Zheng, Kai; Zheng, Ligang; Chu, Tingxiang; Guo, Pinkun
• Is Part Of: Journal of loss prevention in the process industries. Volume 34(2015:Mar.)
• Page Start: 1
• Page End: 9
• Publication Date: 2015-03
• Subjects: Hydrogen/methane -- Premixed flame -- Flame speed -- Overpressure; Chemical industries -- Safety measures -- Periodicals; 660.2804
• DOI: 10.1016/j.jlp.2015.01.017
• Languages: English
• ISSNs: 0950-4230

Abstract

Abstract: An experimental study has been conducted to investigate the effects of hydrogen addition on the fundamental propagation characteristics of methane/air premixed flames at different equivalence ratios in a venting duct. The hydrogen fraction in the methane–hydrogen mixture was varied from 0 to 1 at equivalence ratios of 0.8, 1.0 and 1.2. The results indicate that the tendency towards flame instability increased with the fraction of hydrogen, and the premixed hydrogen/methane flame underwent a complex shape change with the increasing hydrogen fraction. The tulip flame only formed when the fraction of hydrogen ranged from 0 to 50% at an equivalence ratio of 0.8. It was also found that the flame front speed and the overpressure increased significantly with the hydrogen fraction. For all equivalence ratios, the stoichiometric flame ( Φ = 1.0) has the shortest time of flame propagation and the maximum overpressure. Highlights: Effects of hydrogen addition on methane/air premixed flame propagation characteristics were experimentally studied. Hydrogen addition can significantly influence the flame front structure. There is a close relationship between the maximum overpressure and the laminar flame speed.