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- W3206505265 abstract "A numerical study is conducted to emulate the MILD combustion conditions in actual industrial furnaces and to explore the effects of different types of reactants dilution on NOx formation mechanisms and emission characteristics of methane and coke oven gas (COG) combustion. A well-stirred reactor (WSR) is utilized to generate high-temperature flue gas that dilutes and preheats the fuel and the oxidizer at different dilution ratios. The model with two plug-flow reactors and one opposed-flow diffusion flame reactor is selected for the simulations. The OH radical profile analysis indicates that COG combustion maintains a larger reaction zone due to high hydrogen concentration as compared to methane combustion. The results show that there exists a critical oxygen percentage that divides MILD combustion into two different combustion regimes based on the inlet temperature Tin of the reactants. And the critical oxygen percentage to achieve MILD combustion is about 9.5% and 7.5% for methane and COG, respectively. Moreover, the effect of different dilution types on the NOx emissions indicates that the NOx emission index (EINO) value for the fuel dilution case is about 0.2 g-NO/kg-fuel whereas the value for the oxidizer dilution case is around 0.4 g-NO/kg-fuel at the dilution ratio of 0.9. The comparison between the EINO values for fuel dilution and oxidizer dilution cases suggests that the fuel dilution is more effective to reduce NOx emission than the oxidizer dilution. The relative contribution analysis of different NOx formation routes reveals that the dominant NOx formation route is the prompt route for methane combustion whereas the N2O intermediate and NNH routes are also important for COG combustion. The results provide a good insight into the NOx formation mechanism and assist in the design of a low NOx burner of MILD combustion." @default.
- W3206505265 created "2021-10-25" @default.
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- W3206505265 date "2022-02-01" @default.
- W3206505265 modified "2023-10-17" @default.
- W3206505265 title "Numerical analysis of NOx formation mechanisms and emission characteristics with different types of reactants dilution during MILD combustion of methane and coke oven gas" @default.
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- W3206505265 doi "https://doi.org/10.1016/j.fuel.2021.122131" @default.
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