Chemical kinetics mechanism for oxy-fuel combustion of mixtures of hydrogen sulfide and methane

Bongartz, Dominik; Ghoniem, Ahmed F.

doi:10.1016/j.combustflame.2014.08.019

Cited by 75 publications

(43 citation statements)

References 54 publications

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“…The chemical reaction mechanism for sour gas combustion employed in this study is presented in detail in reference [3]. It is a combination of the AramcoMech 1.3 mechanism for the combustion of small hydrocarbons by Metcalfe et al [6] with an optimized version of the recent mechanism for H 2 S oxidation developed by Zhou et al [7].…”

Section: Modelingmentioning

confidence: 99%

“…This is the case for conventional air combustion, but certainly even more so for oxy-combustion with its unusual combustion environment consisting of pure oxygen (O 2 ) and either CO 2 or water (H 2 O) as diluents. As a starting point to address this need, we recently assembled and validated a chemical kinetics mechanism for the combustion of H 2 S and mixtures of CH 4 of H 2 S [3].…”

Section: Introductionmentioning

confidence: 99%

“…One strategy is to use sour gas directly in a gas turbine process employing an oxy-fuel combustion (or oxy-combustion) strategy, possibly combined with enhanced oil recovery. This could help address issues associated with the formation of highly corrosive sulfur trioxide (SO 3 ) and the low heating value caused by the high CO 2 contents in the fuel [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Theoretical expressions for k 1 − k 4 are derived for temperatures up to 3000 K. Although CH 3 SH will be short-lived at high temperatures, these expressions combined with the known equilibrium constants will assist modeling of sulfur systems via the reverse of processes R1.1−R1.4, in analysis of situations where reactions of species such as SH and CH 3 S are relevant, for example, CS 2 formation in the Claus process 15 and the oxidation of H 2 S/CH 4 mixtures in the combustion of sour gas. 16,17 2. EXPERIMENTAL METHODOLOGY We applied the flash photolysis/resonance fluorescence method.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Computational Studies of the Kinetics of the Reaction of Atomic Hydrogen with Methanethiol

et al. 2015

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The overall rate constant for H + CH 3 SH has been studied over 296− 1007 K in an Ar bath gas using the laser flash photolysis method at 193 nm. H atoms were generated from CH 3 SH and in some cases NH 3 . They were detected via timeresolved resonance fluorescence. The results are summarized as k = (3.45 ± 0.19) × 10 −11 cm 3 molecule −1 s −1 exp(−6.92 ± 0.16 kJ mol/RT) where the errors in the Arrhenius parameters are the statistical uncertainties at the 2σ level. Overall error limits of ±9% for k are proposed. In the overlapping temperature range there is very good agreement with the resonance fluorescence measurements of Wine et al. Ab initio data and transition state theory yield moderate accord with the total rate constant, but not with prior mass spectrometry measurements of the main product channels leading to CH 3 S + H 2 and CH 3 + H 2 S by Amano et al.

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“…Several researchers have studied oxygen combustion and clarified its fundamental phenomena (Maruta et al, 2007;Toftegaard et al, 2010;Sevault et al, 2012;Kobayashi et al, 2013;Bongartz and Ghoniem, 2015;Shimokuri et al, 2015). Research works on micro flames have revealed the essence of small-scale combustion (Miesse et al, 2005;Chen et al, 2007;Ju and Maruta, 2011;Hirasawa et al, 2013;Saiki and Suzuki, 2013;Nakamura et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Oxygen combustion of CH<sub>4</sub>-CO<sub>2</sub> mixture in a small-scale counterflow burner

Kadowaki

Kohatsu²,

Uehara³

et al. 2018

JTST

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Oxygen combustion of CH4-CO2 mixture in a small-scale counterflow burner was studied. A diffusion flame was stabilized in the gap between opposed ports ejecting fuel and oxygen gases, and its thickness which depended on the gap distance between burner ports, inner diameter of burner tubes, flow rate of gases and fuel gas component was measured. The gas flow rates were varied such that the apparent equivalence ratio became constant at unity, while the gap distance was varied in the range from 1 mm to less. It was shown that the flame thickness decreased monotonically as the gap distance decreased and that the diffusion flame became thinner when the methane concentration in fuel gas became lower. Increased flame thickness was observed at large gas flow rate, and a diffusion flame was found in smaller gap distance at larger inner diameter. From these data, the relation between the flame thickness and the flame stretch rate was summarized, showing that the flame thickness decreased as the flame stretch became stronger, i.e. the thickness varied inversely with the square root of stretch rate. To elucidate the dependence of the flame thickness on the flame stretch rate, the flame thickness normalized by the average velocity of oxygen gas and the inner diameter was introduced. It was confirmed that the normalized flame thickness depended only on the flame stretch rate.

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Chemical kinetics mechanism for oxy-fuel combustion of mixtures of hydrogen sulfide and methane

Cited by 75 publications

References 54 publications

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

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

Experimental and Computational Studies of the Kinetics of the Reaction of Atomic Hydrogen with Methanethiol

Oxygen combustion of CH<sub>4</sub>-CO<sub>2</sub> mixture in a small-scale counterflow burner

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