Experimental and kinetic modeling study of the oxy-fuel oxidation of natural gas, CH4 and C2H6

Giménez-López, Jorge; Millera, Ángela; Bilbao, Rafael; Alzueta, María U.

doi:10.1016/j.fuel.2015.07.087

Cited by 19 publications

(7 citation statements)

References 56 publications

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“…The produced H 2 O 2 is then consumed by hydrogen-based and methane-based reactions, for example R19, for the formation of high reactive OH radicals and the initiation of the fuel ignition. Moreover, the produced CH 3 interacts with O 2 via R4 for the production of formaldehyde and OH [56,57]. Therefore, it can be said that R2 is an intermediate reaction that affects the production of OH via the production of H 2 O 2 and CH 3 .…”

Section: Methane-based Reactionsmentioning

confidence: 99%

Investigation of the Effect of Hydrogen and Methane on Combustion of Multicomponent Syngas Mixtures using a Constructed Reduced Chemical Kinetics Mechanism

2019

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This study investigated the effects of H2 and CH4 concentrations on the ignition delay time and laminar flame speed during the combustion of CH4/H2 and multicomponent syngas mixtures using a novel constructed reduced syngas chemical kinetics mechanism. The results were compared with experiments and GRI Mech 3.0 mechanism. It was found that mixture reactivity decreases and increases when higher concentrations of CH4 and H2 were used, respectively. With higher H2 concentration in the mixture, the formation of OH is faster, leading to higher laminar flame speed and shorter ignition delay time. CH4 and H2 concentrations were calculated at different pressures and equivalence ratios, showing that at high pressures CH4 is consumed slower, and, at different equivalence ratios CH4 reacts at different temperatures. In the presence of H2, CH4 was consumed faster. In the conducted two-stage sensitivity analysis, the first analysis showed that H2/CH4/CO mixture combustion is driven by H2-based reactions related to the consumption/formation of OH and CH4 recombination reactions are responsible for CH4 oxidation. The second analysis showed that similar CH4-based and H2 -based reactions were sensitive in both, methane- and hydrogen-rich H2/CH4 mixtures. The difference was observed for reactions CH2O + OH = HCO + H2O and CH4 + HO2 = CH3 + H2O2, which were found to be important for CH4-rich mixtures, while reactions OH + HO2 = H2O + O2 and HO2 + H = OH + OH were found to be important for H2-rich mixtures.

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Section: Methane-based Reactionsmentioning

confidence: 99%

Investigation of the Effect of Hydrogen and Methane on Combustion of Multicomponent Syngas Mixtures using a Constructed Reduced Chemical Kinetics Mechanism

2019

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“…However, CO 2rich flue gas is required to increase the efficiency and economy during carbon capture and storage. Several new advanced combustion technologies that use O 2 /CO 2 as an oxidizer, such as oxy-fuel combustion technology (Buhre et al, 2005;Wall, 2007;Hjärtstam et al, 2009;Rathnam et al, 2009;Scheffknecht et al, 2011;Taniguchi et al, 2011;Chen et al, 2012;Dhaneswar and Pisupati, 2012;Luo et al, 2015;Moroń and Rybak, 2015;Liu et al, 2016;Ge et al, 2017;Seddighi, 2017;Menage et al, 2018;Zhang et al, 2018), moderate or intense low-oxygen dilution (MILD) oxy-combustion (Li et al, 2013;Tu et al, 2015;Mardani and FazlollahiGhomshi, 2016;Mao et al, 2017;Gładysz et al, 2018), gaseous fuel-fired oxy-fuel combustion technology (Yin et al, 2011;Seepana and Jayanti, 2012a;Seepana and Jayanti, 2012b;Oh et al, 2013a;Oh et al, 2013b;Oh and Noh, 2014;Giménez-López et al, 2015;Oh and Noh, 2015;Oh and Hong, 2016;Bürkle et al, 2018), and high-temperature oxygen combustion technology (Li et al, 2014;Li et al, 2015;Li et al, 2016), have been developed to meet this requirement. However, many other challenges must be solved before these combustion technologies can be widely adopted in the industry, since the differences in the physical properties and chemical characteristics of CO 2 and N 2 can lead to important distinctions in flame structure.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study on the Combustion Characteristics of a Laminar Non-Premixed Methane Jet Flame in Oxygen/Carbon Dioxide Coflow

Zhang

Xie

et al. 2022

Front. Energy Res.

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The combustion characteristics of laminar non-premixed CH4 jet flame in an O2/CO2 coflows with different oxygen mole fractions were studied experimentally. The flame heights at different oxygen concentrations and fuel jet velocity were obtained. The experimental observation shows that the luminosity of the CH4 jet flame in O2/CO2 coflow is different from that of the flame in air stream. A two-dimensional numerical study of a laminar non-premixed CH4 jet flame in the O2/CO2 coflow with the O2 mole fraction of 0.35 was conducted to analyze the effects of CO2 dilution on the flame. The distribution of OH radicals in the flame was measured experimentally using planar laser-induced fluorescence (PLIF) to validate the computational method adopted in this work, and the computational and experimental results of the OH distributions showed good consistency at various fuel flow velocities. Three artificial species were created in the numerical experiment to analyze the effects of the chemical reactions, third-body collisions, and transport properties of CO2 on the height, width, and temperature distribution of the flame. The results showed that CO2 participation in chemical reactions exerts significant effects on the flame. However, the influences of the third-body effects and transport properties of CO2 on the jet flame are unremarkable. The global reaction pathways and distributions of important species in the laminar non-premixed CH4 jet flame were analyzed in detail to investigate the influence mechanisms of CO2 on the flame height and temperature. The entire flame can be divided into two oxidation parts, which separated by the boundary of the HCCO. The H, O, and OH concentrations and distributions in different parts of the flame were influenced by CO2 dilution, resulting in different flame heights and temperature distributions.

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“…Outras abordagens para a estabilização incluem: o uso de bluff-bodies que estabilizam a chama na região de recirculação, pré-aquecimento, coflow, chamas-piloto, ecoamento Swirl entre outros. No caso particular da oxi-combustão com oxidante rico em dióxido de carbono, diversos estudos experimentais e numéricos (LIU et al, 2001;BENTZEN, 2007;MENDIARA;GLARBORG, 2009;GIMÉNEZ-LÓPEZ et al, 2015) observaram uma redução nas taxas de reação e temperatura da zona de reação. A causa deste efeito ainda é controversa, há autores que o relacionam com a maior capacidade térmica do dióxido de carbono em relação ao nitrogênio, o que levaria a uma redução na temperatura e por conseguinte nas taxas de reação (LIU et al, 2001 Na literatura, a reação 3.2 é considerada a principal fonte de radicais OH * ativados e seu tempo de vida é da ordem de grandeza de 1 µs(GAYDON, 2012).…”

Section: Combustãounclassified

“…Independente do mecanismo, todos devem ser calibrados com base em dados experimentais. Nesse procedimento as reações químicas ocorrem no interior de um reator controlado e instrumentado permitindo a medição simultaneamente de diversas espécies químicas ao longo do tempo em uma dada temperatura, como feito em(GIMÉNEZ-LÓPEZ et al, 2015).Para o metano o mecanismo mais consagrado e estudado é o GRI3.0 que foi avaliado em experimentos de velocidade de chama laminar (MAAREN; THUNG; GOEY, 1994), de Ignição em Shock-Tubes (WOIKI et al, 1998) e em reatores isotérmicos (ALZUETA; GLARBORG; DAM-JOHANSEN, 1997).…”

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“…). Outros autores focaram no papel químico do dióxido de carbono, substancialmente diferente do nitrogênio, pois esse participa ativamente nas reações químicas em especial na reação 2.4(GIMÉNEZ-LÓPEZ et al, 2015).Assim, um excesso de dióxido de carbono desloca a reação 2.4 para o lado direito consumindo radicais H, o que leva a uma redução global das taxas de reação. Para avaliar este efeito foi feita uma simulação da cinética química de uma CounterFlow difussion Flame.A figura 6a mostra um diagrama desse reator.…”

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Investigação das causas das instabilidades na oxi-combustão de gás natural por quimioluminescência.

Bortolin¹

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Experimental and kinetic modeling study of the oxy-fuel oxidation of natural gas, CH4 and C2H6

Cited by 19 publications

References 56 publications

Investigation of the Effect of Hydrogen and Methane on Combustion of Multicomponent Syngas Mixtures using a Constructed Reduced Chemical Kinetics Mechanism

Investigation of the Effect of Hydrogen and Methane on Combustion of Multicomponent Syngas Mixtures using a Constructed Reduced Chemical Kinetics Mechanism

Experimental and Numerical Study on the Combustion Characteristics of a Laminar Non-Premixed Methane Jet Flame in Oxygen/Carbon Dioxide Coflow

Investigação das causas das instabilidades na oxi-combustão de gás natural por quimioluminescência.

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