A study on thermal combustion of lean methane–air mixtures: Simplified reaction mechanism and kinetic equations

Gosiewski, Krzysztof; Pawlaczyk, Anna; Warmuziński, K.; Jaschik, M.

doi:10.1016/j.cej.2009.03.045

Cited by 42 publications

(59 citation statements)

References 17 publications

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“…At ultra-lean conditions and elevated temperatures, the combustion regime shifts to "transitional combustion" requiring longer autoignition delay times [87]. The effect of dilution and low temperature gradients not only affects the competition of different chemical pathways usually hidden by large heat release [89], but also affects the validity of the scheme due to the different activation energies of some elementary reactions outside the range that the scheme was designed for [91,92].…”

Section: Chemical Description Of Ultra-lean Methane Oxidationmentioning

confidence: 99%

“…A study of MILD combustion for methane rich mixtures was initially developed by de Joannon et al [90], but more recent publications for lean conditions have also been reported in a one-dimensional flow reactor [86,88]. The oxidation process is influenced by the heat losses to the surroundings and therefore, the characteristics of the experimental facilities where the measurements are performed must be taken into account [87,91,92]. The work by Sabia et al [87] reported some interesting reactivity behaviours for the oxidation of methane under diluted conditions in the MILD regime named: slow combustion/pyrolysis, pyrolysis, transitional combustion, dynamic behaviour, combustion and slow combustion.…”

Section: Chemical Description Of Ultra-lean Methane Oxidationmentioning

confidence: 99%

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The combustion mitigation of methane as a non-CO 2 greenhouse gas

Jiang

Mira

Cluff

2018

Progress in Energy and Combustion Science

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ABSTRACT:Anthropogenic emissions of non-CO 2 greenhouse gases such as fugitive methane contribute significantly to global warming. A review of fugitive methane combustion mitigation and utilisation technologies, which are primarily aimed at methane emissions from coal mining activities, with a focus on modelling and simulation of ultra-lean methane oxidation/combustion is presented. The challenges associated with ultra-lean methane oxidation are on the ignition of the ultra-lean mixture and sustainability of the combustion process. There is a lack of fundamental studies on chemical kinetics of ultra-lean methane combustion and reliable kinetic schemes that can be used together with computational fluid dynamics studies to design and develop advanced mitigation systems. Mitigation of methane as a greenhouse gas calls for more efforts on understanding ultra-lean combustion. Recuperative combustion provides a promising means for mitigating ultra-lean methane emissions. Progress is needed on effective methods to ignite and to recuperate and retain heat for oxidation/combustion of the ultra-lean mixtures. Catalysts can be very effective in reducing the temperatures required for oxidation while plasmas may be utilised to assist the ignition, but thermodynamic/aerodynamic limits of burning ultra-lean methane remain unexplored. Further technological developments may be focussed on developing innovative capturing technology as well as technological innovations to achieve effective ignition and sustainable oxidation/combustion.

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Section: Chemical Description Of Ultra-lean Methane Oxidationmentioning

confidence: 99%

Section: Chemical Description Of Ultra-lean Methane Oxidationmentioning

confidence: 99%

The combustion mitigation of methane as a non-CO 2 greenhouse gas

Jiang

Mira

Cluff

2018

Progress in Energy and Combustion Science

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“…Moreover, the reaction temperature of methane is low, so gas-phase reactions do not occur under such conditions, and the surface reaction has an inhibitory effect on the space reactions [48], thus, gas phase reactions of CH 4 can be ignored in this work [48][49][50][51]. The detailed kinetic reaction mechanism (Supplementary Materials Table S1) of methane/moist air on the platinum catalytic surface is applied [52].…”

Section: Catalytic Combustion Mechanismsmentioning

confidence: 99%

The Influence of Slight Protuberances in a Micro-Tube Reactor on Methane/Moist Air Catalytic Combustion

Wang

Ran

et al. 2016

Energies

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Abstract:The combustion characteristics of methane/moist air in micro-tube reactors with different numbers and shapes of inner wall protuberances are investigated in this paper. The micro-reactor with one rectangular protuberance (six different sizes) was studied firstly, and it is shown that reactions near the protuberance are mainly controlled by diffusion, which has little effect on the outlet temperature and methane conversion rate. The formation of cavities and recirculation zones in the vicinity of protuberances leads to a significant increase of the Arrhenius reaction rate of CH 4 and gas velocity. Next, among the six different simulated conditions (0-5 rectangular protuberances), the micro-tube reactor with five rectangular protuberances shows the highest methane conversion rate. Finally, the effect of protuberance shape on methane/moist air catalytic combustion is confirmed, and it is found that the protuberance shape has a greater influence on methane conversion rate than the number of protuberances. The methane conversion rate in the micro-tube decreases progressively in the following order: five triangular slight protuberances > five rectangular protuberances > five trapezoidal protuberances > smooth tube. In all tests of methane/moist air combustion conditions, the micro-tube with five triangular protuberances has the peak efficiency and is therefore recommended for high efficiency reactors.

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“…1 Generally, models representing methane combustion use more than 300 reactions to define combustion products, requiring complex computational processing. [5][6][7][8][9] To simplify this problem, the well-known and tested Westbrook and Dryer model (WD-modified) can be used for chemical kinetic calculations. 8 Simulated and real conditions such as biogas concentration, excess air ratio (λ) and temperature are considered in this simulation.…”

Section: Introductionmentioning

confidence: 99%

“…8 Simulated and real conditions such as biogas concentration, excess air ratio (λ) and temperature are considered in this simulation. 4,[9][10][11] The use of simplified mechanisms is also very helpful in Computational Fluid Dynamics analysis (CFD) since, for the same reason, the modeling of industrial combustion requires great computational effort. 8,11 CFD analysis becomes an important industrial tool in which chemical reactions are often represented by a mixed-is-burned assumption or by a chemical equilibrium.…”

Section: Introductionmentioning

confidence: 99%

Methane combustion kinetic rate constants determination: an ill-posed inverse problem analysis

et al. 2013

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Recebido em 11/6/12; aceito em 10/9/12; publicado na web em 1/2/2013 Methane combustion was studied by the Westbrook and Dryer model. This well-established simplified mechanism is very useful in combustion science, for computational effort can be notably reduced. In the inversion procedure to be studied, rate constants are obtained from [CO] concentration data. However, when inherent experimental errors in chemical concentrations are considered, an ill-conditioned inverse problem must be solved for which appropriate mathematical algorithms are needed. A recurrent neural network was chosen due to its numerical stability and robustness. The proposed methodology was compared against Simplex and Levenberg-Marquardt, the most used methods for optimization problems.

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A study on thermal combustion of lean methane–air mixtures: Simplified reaction mechanism and kinetic equations

Cited by 42 publications

References 17 publications

The combustion mitigation of methane as a non-CO 2 greenhouse gas

The combustion mitigation of methane as a non-CO 2 greenhouse gas

The Influence of Slight Protuberances in a Micro-Tube Reactor on Methane/Moist Air Catalytic Combustion

Methane combustion kinetic rate constants determination: an ill-posed inverse problem analysis

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