A numerical study on extinction and NOx formation in nonpremixed flames with syngas fuel

Chun, Kang Woo; Chung, H.J.; Chung, Suk Ho; Choi, Jae-Hun

doi:10.1007/s12206-011-0810-4

Cited by 12 publications

(4 citation statements)

References 12 publications

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“…Literature shows that concentration of NOx resulted from Methane combustion, increases by adding hydrogen, especially in high ratios [33][34][35]. Also, in constant equivalence ratio, adding hydrogen to Methane-air flame increases the flame temperature significantly [36].…”

Section: The Effects Of Pressure and Dilution On No Formationmentioning

confidence: 99%

Effects of pressure and carbon dioxide, hydrogen and nitrogen concentration on laminar burning velocities and NO formation of methane-air mixtures

Zahedi

Yousefi

2014

J Mech Sci Technol

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To cite this version:Peyman Zahedi, Kianoosh Yousefi. Effects of pressure and carbon dioxide, hydrogen and nitrogen concentration on laminar burning velocities and NO formation of methane-air mixtures. AbstractIn this research we have studied the effects of increasing pressure and adding carbon dioxide, hydrogen and nitrogen to Methane-air mixture on premixed laminar burning velocity and NO formation in experimentally and numerically methods. Equivalence ratio was considered within 0.7 to 1.3 for initial pressure between 0.1 to 0.5 MPa and initial temperature was separately considered 298 K. Mole fractions of carbon dioxide, hydrogen and nitrogen were regarded in mixture from 0 to 0.2. Heat flux method was used for measurement of burning velocities of Methane-air mixtures diluted with CO2 and N2. Experimental results were compared to the calculations using a detailed chemical kinetic scheme (GRI-MECH 3.0). At first, the results in atmosphere pressure for Methane-air mixture were calculated and it was compared with the results of literature. Results were in good agreement with published data in the literature. Afterwards, by adding carbon dioxide and nitrogen to Methane-air mixture, we witnessed that laminar burning velocity was decreased, whereas by increasing hydrogen, the laminar burning velocity was increased. Finally, the results showed that by increasing the pressure, the premixed laminar burning velocity decreased for all mixtures and NO formation indicates considerable increase, whereas the laminar flame thickness decreases.

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Section: The Effects Of Pressure and Dilution On No Formationmentioning

confidence: 99%

Effects of pressure and carbon dioxide, hydrogen and nitrogen concentration on laminar burning velocities and NO formation of methane-air mixtures

Zahedi

Yousefi

2014

J Mech Sci Technol

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“…For example, the combustion of syngas and its dilution was examined by Chun et al [14]. Among the results described above, it was discovered that an increase in N radicals leads to more significant NO x production.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Inert Fuel Compounds on Flame Characteristics

et al. 2021

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To describe the effects of inert compounds in gaseous fuel, experiments on three different process burners (staged fuel burner, staged air burner, and low-calorific burner) were carried out. The tested burners are commercially available, but they were specially designed for experimental usage. Tests were carried out in the semi-industrial burner testing facility to investigate the influence of inert gases on the flame characteristics, emissions, and heat flux to the combustion chamber wall. Natural gas was used as a reference fuel, and, during all tests, thermal power of 500 kW was maintained. To simulate the combustion of alternative fuels with lower LHV, N2 and CO2 were used as diluents. The inert gas in the hydrocarbon fuel at certain conditions can lower NOx emissions (up to 80%) and increase heat flux (up to 5%). Once incombustible compounds are present in the fuel, the higher amount of fuel flowing through nozzles affects the flow in the combustion chamber by increasing the Reynolds number. This can change the flame pattern and temperature field, and it can be both positive and negative, depending on actual conditions.

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“…Most of the developed mechanisms have been validated against experimental values of laminar flame speeds [17][18][19][20]. Other researchers have studied the effects of different fuel compositions [21], nitrogen and carbon dioxide dilutions [22,23], preheat temperatures and pressures [24,25] as well as emissions [26][27][28] on the accuracy of the developed mechanisms. Syngas mechanisms developed have also been used variously in CFD modeling of syngas.…”

Section: Introductionmentioning

confidence: 99%

Effect of different syngas compositions on the combustion characteristics and emission of a model combustor

Sanusi¹,

Dandajeh²

2020

Nig. J. Tech.

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There is a growing need to design fuel flexible combustors. This require understanding of the combustion and emission characteristics of the combustors under varying fuel compositions. In the present study, the combustion characteristics and emission of methane and syngas flames were investigated numerically in a swirl stabilized combustor. The numerical model was developed using ANSYS-fluent software and validated using experimental values of temperature, CO2 and NOx emissions. A two-step chemical mechanism was used to model methane-air combustion. Results of the numerical validation showed similar trend between the experimental and predicted temperature along the combustor axis with about 5 % over prediction of the temperature. Syngas-air combustion was thereafter modeled using a 21 step chemical mechanism. Syngas compositions studied were: syngas A (67% CO: 33% H2), syngas B (50% CO: 50% H2) and syngas C (33% CO: 67% H2). Results showed that for pure methane, a V-shaped flame was observed with the flame attached to the fuel nozzle, while a lifted flame was observed for case of syngas A composition. CO gas with higher ignition temperature and flammability as compared to H2 gas is the dominant gas in syngas A fuel composition. Jet flames were observed for syngas B and syngas C. Carbon monoxide is a slow burning gas. Therefore syngas with low CO content has a low tendency of emission of CO from the combustor. This suggests that syngas with high CO content such syngas A may require more residence time to completely combust the CO gas. The NOx emission was observed to have the same trend as that of the combustor maximum temperature. Syngas C flame had the highest NOx emission, while, syngas A flame had no NOx emission. This is due to low combustor temperature observed in the case of syngas A flame. Keywords: Syngas, ANSYS-FLUENT, Swirl-stabilized combustor, NOx emission, Chemical Mechanism

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A numerical study on extinction and NOx formation in nonpremixed flames with syngas fuel

Cited by 12 publications

References 12 publications

Effects of pressure and carbon dioxide, hydrogen and nitrogen concentration on laminar burning velocities and NO formation of methane-air mixtures

Effects of pressure and carbon dioxide, hydrogen and nitrogen concentration on laminar burning velocities and NO formation of methane-air mixtures

The Effect of Inert Fuel Compounds on Flame Characteristics

Effect of different syngas compositions on the combustion characteristics and emission of a model combustor

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