Modeling CO<sub>2</sub>Chemical Effects on CO Formation in Oxy-Fuel Diffusion Flames Using Detailed, Quasi-Global, and Global Reaction Mechanisms

Chen, Lei; Ghoniem, Ahmed F.

doi:10.1080/00102202.2014.883384

Cited by 18 publications

(16 citation statements)

References 33 publications

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“…Recently, Chen et al 36 numerically studied the oxidation of methane in a one-dimensional, opposed-flow flame. They performed preliminary thermodynamic calculations showing that from a chemical perspective, CO 2 affects the concentration of CO at the equilibrium state under rich/lean mixture conditions.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Behaviors in Methane MILD and Oxy-Fuel Combustion. Chemical Effect of CO₂

Sabia

Sorrentino²,

Chinnici

et al. 2015

Energy Fuels

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The oxidation process of CH 4 /O 2 mixtures diluted in CO 2 under MILD/Oxy-fuel conditions was numerically investigated in a perfectly stirred flow reactor at atmospheric pressure. The analysis aimed to investigate the kinetics involved in fuel oxidation in systems highly diluted and strongly pre-heated. Particular attention was focused on the effects of CO 2 on oxidation routes because it can significantly alter the kinetic pathways participating directly in key reactions, or indirectly in termolecular reactions as a third body species. Furthermore, adiabatic flame temperatures are lower with respect to air conditions because of the higher thermal heat capacity of CO 2 in comparison to N 2 , thus modifying the kinetics promoted by temperature in combustion processes. The analyses were realized as a function of main system parameters, systematically changing inlet temperatures and mixture compositions.Results showed the establishment of complex dynamic behaviors in terms of temperature oscillations for both lean and rich fuel mixtures, in both non-adiabatic and adiabatic conditions. Further numerical analyses were performed to highlight the kinetic aspects of the problem. Simulations suggested that in fuel lean conditions, the dynamics observed are related to the H 2 /O 2 sub-system reactions independently of diluent nature, while, for fuel rich mixtures diluted in carbon dioxide, the CO 2 decomposition to CO and CH 3 recombination to ethane are key reactions for the onset of temperature oscillations.

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Section: Introductionmentioning

confidence: 99%

Dynamic Behaviors in Methane MILD and Oxy-Fuel Combustion. Chemical Effect of CO₂

Sabia

Sorrentino²,

Chinnici

et al. 2015

Energy Fuels

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“…We only discuss air combustion here, since the only significant effects in oxy-fuel combustion as compared to air combustion that we observed have been reported in the literature before. Namely, these are a rise in CO and a drop in H 2 mole fractions for CO 2 diluted oxy-combustion, and slightly lower CO and higher H 2 for H 2 O diluted oxy-combustion [37][38][39][40].…”

Section: Premixed Flame Structurementioning

confidence: 99%

Impact of sour gas composition on ignition delay and burning velocity in air and oxy-fuel combustion

Bongartz¹,

Ghoniem²

2015

Combustion and Flame

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Sour gas is an unconventional fuel consisting mainly of methane (CH 4 ), carbon dioxide (CO 2 ), and hydrogen sulfide (H 2 S) that constitutes a considerable, currently untapped energy source. However, little is known about its combustion characteristics. In this work, we used our recently assembled and validated detailed chemical reaction mechanism to examine some of the combustion properties of sour gas with different compositions in both conventional air combustion and oxy-fuel combustion, the latter being motivated by application in carbon capture and storage. The calculations suggest that raising the H 2 S content in the fuel leads to relatively small changes in the flame temperature and laminar burning velocity, but a considerable reduction in the ignition delay time. At elevated pressures, H 2 O diluted oxyfuel combustion leads to higher burning velocities than CO 2 diluted oxy-fuel combustion or air combustion. Mixed CH 4 /H 2 S flames exhibit a two-zone structure in which H 2 S is oxidized completely to sulfur dioxide (SO 2 ) while CH 4 is converted to carbon monoxide (CO). Formation of corrosive sulfur trioxide (SO 3 ) mainly occurs during CO burnout.

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“…On the contrary, CO 2 and H 2 O can drastically alter the ignition process in dependence of operating conditions with a twofold interaction. They increase system reactivity at low temperatures (Sabia et al, 2007(Sabia et al, , 2015Sjöberg et al, 2007;Anderlohr et al, 2010;Lubrano Lavadera et al, 2016), but delay it at intermediatehigh temperatures (Mueller et al, 1999;Cadman et al, 2000;de Joannon et al, 2002;Park et al, 2003;Wang et al, 2003Wang et al, , 2013Herzler et al, 2004;Penyazkov et al, 2005;Zabetta et al, 2005;Basevich and Frolov, 2007;Glarborg and Bentzen, 2007;Sjöberg et al, 2007;Gallagher et al, 2008;Le Cong and Dagaut, 2009a,b;Mendiara and Glarborg, 2009;Mardani et al, 2010Mardani et al, , 2013Lee et al, 2012;Sabia et al, 2013Sabia et al, , 2015Chen and Ghoniem, 2014;Xie et al, 2014a;Song et al, 2015;Zou et al, 2015;Hashemi et al, 2016Hashemi et al, , 2017Hashemi et al, , 2019Lubrano Lavadera et al, 2016, 2018aEvans et al, 2017;He et al, 2017;Fedyaeva et al, 2018;Sorrentino et al, 2018;Zhang et al, 2019). ...…”

Section: Discussionmentioning

confidence: 99%

Critical Issues of Chemical Kinetics in MILD Combustion

Sabia

Joannon

2020

Front. Mech. Eng.

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Mild combustion processes occur with mixtures highly diluted and preheated by a strong recirculation of hot exhausted gases (thus mass and sensible enthalpy) within the combustion chamber. This strategy configures a process based on autoignition kernels outside or close to flammability limits transported by convection in the combustion chamber, thus defining a process with unique physical and chemical features drastically different from traditional deflagrative-diffusive flames. The article aims at analyzing the recent issues relative to kinetic aspects involved in moderate or intense low-oxygen dilution (MILD) combustion processes. First, the article comes through the identification of peculiar experimental features of simple hydrocarbons oxidation process induced by highly preheated and diluted conditions in model reactors typical of chemical engineering. Second, the effects of steam and carbon dioxides on fuel oxidation process, whose presence within the combustion chamber is imposed by high levels of hot gas recirculation, are addressed. Third, the article comes through a thorough analysis of recent scientific contributions on kinetic aspects of MILD combustion processes to identify the critical points in modeling activities.

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Modeling CO₂Chemical Effects on CO Formation in Oxy-Fuel Diffusion Flames Using Detailed, Quasi-Global, and Global Reaction Mechanisms

Cited by 18 publications

References 33 publications

Dynamic Behaviors in Methane MILD and Oxy-Fuel Combustion. Chemical Effect of CO₂

Dynamic Behaviors in Methane MILD and Oxy-Fuel Combustion. Chemical Effect of CO₂

Impact of sour gas composition on ignition delay and burning velocity in air and oxy-fuel combustion

Critical Issues of Chemical Kinetics in MILD Combustion

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Modeling CO2Chemical Effects on CO Formation in Oxy-Fuel Diffusion Flames Using Detailed, Quasi-Global, and Global Reaction Mechanisms

Cited by 18 publications

References 33 publications

Dynamic Behaviors in Methane MILD and Oxy-Fuel Combustion. Chemical Effect of CO2

Dynamic Behaviors in Methane MILD and Oxy-Fuel Combustion. Chemical Effect of CO2

Impact of sour gas composition on ignition delay and burning velocity in air and oxy-fuel combustion

Critical Issues of Chemical Kinetics in MILD Combustion

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Product

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Modeling CO₂Chemical Effects on CO Formation in Oxy-Fuel Diffusion Flames Using Detailed, Quasi-Global, and Global Reaction Mechanisms

Dynamic Behaviors in Methane MILD and Oxy-Fuel Combustion. Chemical Effect of CO₂

Dynamic Behaviors in Methane MILD and Oxy-Fuel Combustion. Chemical Effect of CO₂