An experimental parametric study of gas reburning under conditions of interest for oxy-fuel combustion

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

doi:10.1016/j.fuproc.2010.11.014

Cited by 39 publications

(32 citation statements)

References 48 publications

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“…This is contrary to previous literatures, which instead show that the role of CO 2 is to inhibit CH 4 oxidation in a dilute flow reactor (6,9) . The details of our findings will be discussed later.…”

Section: Journal Of Thermal Science and Technologycontrasting

confidence: 99%

“…Therefore, CH 4 is often the focus of O 2 /CO 2 combustion studies. Many studies have reported that CO 2 is not inert but participates in chemical reactions in its gas phase primarily through the reaction CO 2 + H = CO + OH (R1) (5)(6)(7)(8)(9)(10)(11)(12)(13) .…”

Section: Journal Of Thermal Science and Technologymentioning

confidence: 99%

“…The effect of R1 on the combustion process has been extensively studied (5)(6)(7)(8)(9)(10)(11)(12)(13) , and some studies have shown that CO 2 inhibits the oxidation of CH 4 because of the competition between reactions R1 and H + O 2 = O + OH (R3), the main chain branching reaction in the combustion process in a dilute flow reactor (7,10) . In contrast, our previous paper shows the role of CO 2 was to advance CH 4 oxidation during fuel-rich O 2 /CO 2 combustion where the concentrations of reactants were high because R3 became insignificant under fuel-rich condition, and R1 produced an abundance of OH radicals that were more active than the H radicals in hydrocarbon reactions in the specific temperature range (12,13) .…”

Section: Journal Of Thermal Science and Technologymentioning

confidence: 99%

“…H + CH 3 (+M) → CH 4 (+M) (R5) Several studies have shown that high levels of CO 2 reduce the amount of H radicals through R1 reaction, lowering the rate of formation of chain carriers via R3 reaction (5)(6)(7)(8)(9)(10) .…”

Section: Journal Of Thermal Science and Technologymentioning

confidence: 99%

“…This means that competitive reactions with R3 for H radicals (reactions such as R1) strongly inhibit CH 4 oxidation. In fact, in the presence an excessive amount of O 2 , the chemical role of CO 2 is to only decrease the rate of CH 4 oxidation as many researchers have stated (6,9) . …”

Section: Journal Of Thermal Science and Technologymentioning

confidence: 99%

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Experimental and Kinetic Studies of Chemical Role of CO2 in Hydrocarbon Oxidation during Fuel-Rich O2/CO2 Combustion

Watanabe

Kiatpanachart

Okazaki

2013

JTST

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Experimental and kinetic studies of the chemical role of CO 2 in hydrocarbon reactions were conducted in a fuel-rich CH 4 flat flame with air ratios varying from 0.60 to 0.74. Unburned hydrocarbons (CH 4 , C 2 H 2 , C 2 H 4 , and C 2 H 6 ) in O 2 /CO 2 combustion were found to be lower than those in air combustion. The differences in the CH 4 oxidation characteristics between the air and O 2 /CO 2 combustion were caused by the chemical role of CO 2 in the reaction R1 (CO 2 + H → CO + OH), R2 (CH 2 (S) + CO 2 → CH 2 O + CO), and higher third body efficiencies of CO 2 at an air ratio (= 0.62 where the concentrations of reactants were high. The role of CO 2 in R1, R2, and the higher third body efficiencies of CO 2 decreased the rate of CH 4 oxidation during the early stage of combustion, where O 2 was present. Even though R2 did not directly compete with the main chain branching reaction R3 (H + O 2 → H + OH) for H radicals, like R1 did, R2 changed the hydrocarbon reaction pathway, thereby decreasing the rate of R4 (CH 3 + HO 2 → CH 3 O + OH) which had negative sensitivity in CH 4 oxidation. However, we found that R1 and R2 advance CH 4 oxidation in the last stage of combustion where O 2 was mostly consumed. This is attributed to the fact that the reactions R1 and R2 were able to advance without the presence of O 2 , and that R1 produced OH radicals that were active in hydrocarbon oxidation in the specific temperature range and R2 enhanced hydrocarbon oxidation when the rate of R4 was insignificant. Although R1 was the dominant reaction to reduce unburned hydrocarbons in the O 2 /CO 2 combustion, the role of R2 was significant at  = 0.62. Meanwhile, when the air ratio was 0.74 where concentrations of reactants were relatively low, the chemical role of CO 2 is to only decrease the rate of CH 4 oxidation due to the presence of an excessive amount of O 2 .

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Section: Journal Of Thermal Science and Technologycontrasting

confidence: 99%

Section: Journal Of Thermal Science and Technologymentioning

confidence: 99%

Section: Journal Of Thermal Science and Technologymentioning

confidence: 99%

Section: Journal Of Thermal Science and Technologymentioning

confidence: 99%

Section: Journal Of Thermal Science and Technologymentioning

confidence: 99%

See 3 more Smart Citations

Experimental and Kinetic Studies of Chemical Role of CO2 in Hydrocarbon Oxidation during Fuel-Rich O2/CO2 Combustion

Watanabe

Kiatpanachart

Okazaki

2013

JTST

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Formation of NO from N₂/O₂ Mixtures in a Flow Reactor: Toward an Accurate Prediction of Thermal NO

Abián

Alzueta

Glarborg

2015

Int J of Chemical Kinetics

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We have conducted flow reactor experiments for NO formation from N2/O2 mixtures at high temperatures and atmospheric pressure, controlling accurately temperature and reaction time. Under these conditions, atomic oxygen equilibrates rapidly with O2. The experimental results were interpreted by a detailed chemical model to determine the rate constant for the reaction N2 + O ⇌ NO + N (R1). We obtain k1 = 1.4 × 1014 exp(−38,300/T) cm3 mol−1 s−1 at 1700–1800 K, with an error limit of ±30%. This value is 25% below the recommendation of Baulch et al. for k1, while it corresponds to a value k1b of the reverse reaction 25% above the Baulch et al. evaluation. Combination of our results with literature values leads to a recommended rate constant for k1b of 9.4 × 1012 T0.14 cm3 mol−1 s−1 over 250–3000 K. This value, which reconciles the differences between the forward and reverse rate constant, is recommended for use in kinetic modeling.

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Aerodynamics issues and configurations in MILD reactors

Sorrentino

Ariemma

Manna

et al. 2022

Fundamentals of Low Emission Flameless Combustion and Its Applications

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An experimental parametric study of gas reburning under conditions of interest for oxy-fuel combustion

Cited by 39 publications

References 48 publications

Experimental and Kinetic Studies of Chemical Role of CO<sub>2</sub> in Hydrocarbon Oxidation during Fuel-Rich O<sub>2</sub>/CO<sub>2</sub> Combustion

Experimental and Kinetic Studies of Chemical Role of CO<sub>2</sub> in Hydrocarbon Oxidation during Fuel-Rich O<sub>2</sub>/CO<sub>2</sub> Combustion

Formation of NO from N₂/O₂ Mixtures in a Flow Reactor: Toward an Accurate Prediction of Thermal NO

Aerodynamics issues and configurations in MILD reactors

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An experimental parametric study of gas reburning under conditions of interest for oxy-fuel combustion

Cited by 39 publications

References 48 publications

Experimental and Kinetic Studies of Chemical Role of CO<sub>2</sub> in Hydrocarbon Oxidation during Fuel-Rich O<sub>2</sub>/CO<sub>2</sub> Combustion

Experimental and Kinetic Studies of Chemical Role of CO<sub>2</sub> in Hydrocarbon Oxidation during Fuel-Rich O<sub>2</sub>/CO<sub>2</sub> Combustion

Formation of NO from N2/O2 Mixtures in a Flow Reactor: Toward an Accurate Prediction of Thermal NO

Aerodynamics issues and configurations in MILD reactors

Contact Info

Product

Resources

About

Formation of NO from N₂/O₂ Mixtures in a Flow Reactor: Toward an Accurate Prediction of Thermal NO