A 5-step reduced mechanism for combustion of CO/H2/H2O/CH4/CO2 mixtures with low hydrogen/methane and high H2O content

TLDR: ZMN and NS acknowledge the funding through the Low Carbon Energy University Alliance Programme supported by Tsinghua University, China as mentioned in this paper, and also like to acknowledge the educational grant through the A.G. LeventisFoundation.

About: This article is published in Combustion and Flame.The article was published on 2013-01-01 and is currently open access. It has received 63 citations till now.

Figures

Fig. 18: Flame structure for CO/H2/O2/He. He/O2 = 7.0, φ = 2.0, fH2 = 1.0, Tu = 298 K, p = 10 atm. (conditions as in Fig.8 top).

Fig. 4: Laminar flame speeds of CO/H2-air mixtures using the reduced (dashed lines) and skeletal (full lines) mechanisms. Symbols: experimental results of Vagelopoulos and Egolfopoulos [48]. Tu = 298 K, p = 1 atm, XN2/XO2 = 3.76.

Fig. 3: Laminar flame speeds of syngas mixtures ( CO/H2/CH4/CO2/N2-air ) using the reduced (dashed lines) and the skeletal (full lines) mechanisms. Symbols: experimental results of Yong et al. [27]. fCH4 = 0.24 with 11% CO2 and 42.7% N2 in the fuel mixture. Tu = 298 K, p = 1 atm, XN2/XO2 = 3.76. Error bars from [27] are also shown.

Table 3: The skeletal mechanism. Units are in cm, s, mol, cal, K.

Fig. 14: Laminar flame speeds of CO/CH4/H2O/O2/N2 mixtures using the reduced (dashed lines) and skeletal (continuous lines) mechanisms. Symbols: GRI Mech 3.0 predictions. fCH4 = 5/95, Tu = 600 K at p = 1 and 10 atm.

Fig. 8: Laminar flame speeds of CO/H2 mixtures using the reduced (dashed lines) and skeletal (continuous lines) mechanisms. Symbols: experimental results of Sun et al. [33]. At p = 1 atm the oxidizer is O2,N2 with XN2/XO2 = 3.76. At p = 5, 10, 20 atm the oxidizer is O2 and He with XHe/XO2 = 7.0. Open symbols: experimental results of Singh et al. [21].

Frequently asked questions

Q1. What are the contributions in "A 5-step reduced mechanism for combustion of co/h2/h2o/ch4/co2 mixtures with low hydrogen/methane and high h2o content" ?

In this study a 5-step reduced chemical kinetic mechanism involving 9 species is developed for combustion of Blast Furnace Gas ( BFG ), a multi-component fuel containing CO/H2/CH4/CO2, typically with low hydrogen, methane and high water fractions, for conditions relevant for stationary gas-turbine combustion. 

Q2. What are the future works in "A 5-step reduced mechanism for combustion of co/h2/h2o/ch4/co2 mixtures with low hydrogen/methane and high h2o content" ?

The computational results are compared to experimental measurements of the flame speeds available in the literature for a wide range of pressure, 1-20 atm., temperature, 298- 700 K and thermo-chemical conditions. The authors thank the reviewers for suggesting many validation data which helped to show the robustness of the mechanisms over wide range of conditions for flame speeds and autoignition delay times.