SO2 effects on CO oxidation in a CO2 atmosphere, characteristic of oxy-fuel conditions

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

doi:10.1016/j.combustflame.2010.07.017

Cited by 55 publications

(51 citation statements)

References 49 publications

(67 reference statements)

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“…This sequence corresponds to a net removal of H and OH radicals through the mechanism described by Rasmussen et al [21], although the chain terminating effect is weaker if reactions R9 or R18 are involved. Sequences similar to R14-R18 are well known to inhibit the oxidation of CO in the presence of SO 2 [22][23][24][25]. Zachariah and Smith [26] also concluded from their experimental and numerical results that SO 2 reduces the flame speed of H 2 flames through a similar mechanism.…”

Section: Impact Of Fuel Compositionmentioning

confidence: 68%

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: Impact Of Fuel Compositionmentioning

confidence: 68%

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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“…However, there remain some quantitative discrepancies, especially at higher temperatures. This was also observed by Fleig et al [62] using the kinetic model from [63]. We were not able to remove this discrepancy by including these experiments as optimization targets.…”

Section: Validation: H 2 S Oxidationmentioning

confidence: 68%

“…The combined mechanism can capture the inhibiting effect of SO 2 on CO oxidation at stoichiometric conditions observed by Giménez-López et al [63] both in a nitrogen (N 2 ) bath and in the presence of CO 2 (see Fig. 18).…”

Section: Validation: Interactions Between Ch 4 and H 2 Smentioning

confidence: 93%

“…One possible interaction between carbon and sulfur species is the inhibition of CO oxidation by SO 2 [30,31,63,64]. The combined mechanism can capture the inhibiting effect of SO 2 on CO oxidation at stoichiometric conditions observed by Giménez-López et al [63] both in a nitrogen (N 2 ) bath and in the presence of CO 2 (see Fig.…”

Section: Validation: Interactions Between Ch 4 and H 2 Smentioning

confidence: 99%

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

Bongartz

Ghoniem

2015

Combustion and Flame

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Oxy-fuel combustion of sour gas, a mixture of natural gas (essentially methane (CH 4 )), carbon dioxide (CO 2 ), and hydrogen sulfide (H 2 S), could enable the utilization of large natural gas resources, especially when combined with enhanced oil recovery. In this work, a detailed chemical reaction mechanism for oxy-fuel combustion of sour gas is presented. To construct the mechanism, a CH 4 sub-mechanism was chosen based on a comparative validation study for oxy-fuel combustion. This mechanism was combined with a mechanism for H 2 S oxidation, and the sulfur sub-mechanism was then optimized to give better agreement with relevant experiments. The optimization targets included predictions for the laminar burning velocity, ignition delay time, and pyrolysis of H 2 S, and H 2 S oxidation in a flow reactor. The rate parameters of 15 sulfur reactions were varied in the optimization within their respective uncertainties. The optimized combined mechanism was validated against a larger set of experimental data over a wide range of conditions for oxidation of H 2 S and interactions between carbon and sulfur species. Improved overall agreement was achieved through the optimization and all important trends were captured in the modeling results. The optimized mechanism can be used to make qualitative and some quantitative predictions on the combustion behavior of sour gas. The remaining discrepancies highlight the current uncertainties in sulfur chemistry and underline the need for more accurate direct determination of several important rate constants as well as more validation data.

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“…In air, the conversion is 91%, which means that almost all sulphur is converted into SO 2 . For combustion in O 2 /CO 2 mixtures, the conversion drops on average to 75%, and for recycle combustion the average conversion in only 64% (Croiset and Thambimuthu, 2001, Sen et al 2008, Giménez-López et al 2011). Oxygen content difference was calculated from:…”

Section: Introductionmentioning

confidence: 99%

NOx and SO2 Emission During OXY-Coal Combustion

Moroń

Czajka

Ferens

et al. 2013

Chemical and Process Engineering

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The paper presents results of coal behaviour during combustion in oxy-fuel atmosphere. The experiment was performed using 3 meter long Entrained Flow Reactor and 1 meter long Drop Tube Reactor. Three hard coals and two lignites were analysed in order to investigate NOx, SO 2 emission and fly ash burnout. The measurements were performed along and at the outlet of a combustion chamber for one-and two -stage combustion. In the second stage of the experiment, kinetic parameters for nitrogen evolution during combustion in oxy -fuel and air were calculated and the division of nitrogen into the volatile matter and the char was measured. The conducted experiment showed that emissions in oxy -fuel are lower than those in air.

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SO2 effects on CO oxidation in a CO2 atmosphere, characteristic of oxy-fuel conditions

Cited by 55 publications

References 49 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

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

NOx and SO2 Emission During OXY-Coal Combustion

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