The synergistic effect of equivalence ratio and initial temperature on laminar flame speed of syngas. (30th June 2022)

• Record Type: Journal Article
• Authors: Guo, Pinkun; Liu, Songjie; Chang, Xinyue; Wang, Zhirong; Xu, Chuanqing; Hu, Lin; Lu, Junchen
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 55(2022)
• Page Start: 23106
• Page End: 23117
• Publication Date: 2022-06-30
• Subjects: Syngas -- Laminar flame speed -- Equivalence ratio -- Initial temperature -- Synergistic effect; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.05.125
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The laminar flame speed of syngas (CO:H2 = 1:1)/air premixed gas in a wide equivalence ratio range (0.6–5) and initial temperature (298–423 K) was studied by Bunsen burner. The results show that the laminar flame speed first increases and then decreases as the equivalence ratio increasing, which is a maximum laminar flame speed at n = 2. The laminar flame speed increases exponentially with the increase of initial temperature. For different equivalent ratios, the initial temperature effects on the laminar flame speed is different. The initial temperature effects for n = 2 (the most violent point of the reaction) is lower than others. It is found that H, O and OH are affected more and more when the equivalence ratio increase. When the equivalence ratio is far from 2, the reaction path changes, and the influence of initial temperature on syngas combustion also changes. The laminar flame speed of syngas is more severely affected by H + O2 = O + OH and CO + OH = CO2 + H than others, which sensitivity coefficient is larger and change more greatly than others when the initial temperature and equivalence ratio change. Therefore, the laminar flame speed of syngas/air premixed gas is affected by the initial temperature and equivalence ratio. A new correlation is proposed to predict the laminar flame speed of syngas (CO:H2 = 1:1)/air premixed gas under the synergistic effect of equivalence ratio and initial temperature (for equivalence ratios of 0.6–5, the initial temperature is 298–423 K). Highlights: The laminar flame speed of syngas was tested at different n and T. A new correlation was proposed to predict the laminar flame speed of syngas. The influence of n and T on the main reaction path was analyzed. A synergistic effect of n and T on laminar flame speed of syngas was analyzed.