CIESC Journal ›› 2019, Vol. 70 ›› Issue (4): 1644-1651.doi: 10.11949/j.issn.0438-1157.20181008

• Process safety • Previous Articles     Next Articles

Extinction mechanism of ethylene opposed-flow diffusion flame using chemical explosive mode analysis method

Yinhu KANG1(),Pengyuan ZHANG2,Congcong LIU2,Jiangze MA2,Xiaofeng LU1   

  1. 1. Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, China
    2. School of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400045, China
  • Received:2018-09-05 Revised:2019-01-15 Online:2019-04-05 Published:2019-04-17
  • Contact: Yinhu KANG E-mail:cqukangyh@cqu.edu.cn

Abstract:

The basic methodological theory as well as its feasibility of the chemical explosion mode analysis (CEMA) method in flame extinction mechanism study was particularly emphasized. The interaction between detailed chemistry and thermal/mass mixing as well as its impact on flame extinction was analyzed. The concept of factor determines the key reaction kinetic factors that dominate the flame flameout limit of ethylene. The results show that the CEM with positive eigenvalues firstly appeared at the stoichiometric location in the near-extinction condition, so positive CEM could play as an important criterion for the detection of combustion instability. The extinction limit of opposed-flow diffusion flame resulted from the comprehensive interaction between heat release and chain branching and termination reactions. It is found that the branching reaction R32 (H+O2 ? O+OH) and exothermic reaction R81(OH+CO ? H+CO2) were most significant for the ethylene flame extinction limit, which could be largely broadened with the enhancements of these two recations. On the contrary, enhancement of the termination reaction R49 (H+HCO ? H2+CO) was unforable to ethylene flammability. The CEMA theory with the concepts of explosive index and bifurcation index was a systematical tool to reveal the impact of detailed chemical kinetics on flame extinction mechanism.

Key words: dynamics theory, explosion, chemical reaction, computational simulation, fuel

CLC Number: 

  • TK 4

Fig.1

Diagram of 1-D ethylene opposed-flow diffusion flame"

Fig.2

S-curves using detailed and reduced USC mechanisms"

Fig.3

(a) S-curve of C2H4 opposed-flow diffusion flame at 50 kPa (20%C2H4/80%N2 vs 20%O2/80%N2)(P1—P5 are five typical points along S-curve); (b) Plots of sign(Re(λ e))×lg(1+|Re(λ e)|) vs temperature at stoichiometric location along the S-curve; (c) Plots of sign(Re(λ e))×lg(1+|Re(λ e)|) vs mixture fraction at points P1—P5, respectively(Re(λ e) is the real part of CEM mode)"

Fig.4

(a) Governing reactions for CEM at the stoichiometric location of flame P3 and their BI values; (b) Response of S-curve after the pre-factors (Ar ) of governing reactions were multiplied by 2"

Fig.5

Heat release rates of governing reactions at the stoichiometric location of flame P3(Positive heat release designates exothermicity and the negative designates endothermicity. The parenthesized red number following each reaction shows the index of its absolute heat release rate in deceasing order)"

Fig.6

Governing species or temperature with their corresponding EI at stoichiometric location of P3 flame"

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