Experimental and numerical study on the CO formation mechanism in methane MILD combustion without preheated air

Liu, Yang; Cheng, Jia; Zou, Chun; Cai, Lei; He, Yizhuo; Chen, Zheng

doi:10.1016/j.fuel.2016.12.010

Cited by 30 publications

(18 citation statements)

References 26 publications

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“…22,34,39,44 Interestingly, however, a relatively high CO concentration region appears to exist in the reaction zone of MILD combustion. 116,117 This perhaps suggests reaction paths of hydrocarbon in MILD combustion different from those under the traditional combustion. Through the RANS modeling coupled with GRI3.0, Liu et al 117 Besides, the reaction temperature and equivalence ratio differently impact chemical pathways of MILD combustion.…”

Section: Enclosed Furnace Mild Combustion and Itsmentioning

confidence: 99%

“…116,117 This perhaps suggests reaction paths of hydrocarbon in MILD combustion different from those under the traditional combustion. Through the RANS modeling coupled with GRI3.0, Liu et al 117 Besides, the reaction temperature and equivalence ratio differently impact chemical pathways of MILD combustion. 115 At low temperatures (e.g., 1200 K), the prominent reaction pathways are CH…”

Section: Enclosed Furnace Mild Combustion and Itsmentioning

confidence: 99%

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Review on MILD Combustion of Gaseous Fuel: Its Definition, Ignition, Evolution, and Emissions

Wang

et al. 2021

Energy Fuels

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Combustion of fossil fuels has been continuously generating over 70% of the total energy for our human society, concurrently emitting vastly greenhouse gases and ecologically harmful pollutants. To mitigate the adverse issue, combustion technologies of a new type were successfully developed and debuted around 1990, associated with various terms of "flameless oxidation (FLOX)", "flameless combustion (FLC)", "high-temperature air combustion (HiTAC)", and "moderate and intense low-oxygen dilution (MILD) combustion". These combustion processes may be regarded as similar or the same class of combustion, because they all involve high preheat and deep dilution of individual reactants (nonpremixed) or the reactant mixture (premixed), prior to main combustion reactions, with high-temperature flue gases (burnt products) internally and/or externally. Very significantly, all of these combustion technologies can simultaneously achieve high efficiency and ultralow emissions of nitric oxides (NOx), light, and noise. This class of combustion has been frequently unified as "MILD combustion". Highly worthy to note, as a particular type of combustion, the MILD combustion has thus far been most extensively explored, resulting in many hundreds to 1000 academic articles published by various energy-related journals and conferences. The present review summarizes the research progress in the gaseous-fuel MILD combustion on its definition, ignition, evolution, and NOx emissions, specifically, through its aspects associated with open jet flames in hot coflow and industrial flames in combustion chamber or furnace. Also, discussions are provided on the relevant terminologies, existing problems, and further fundamental issues.

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Section: Enclosed Furnace Mild Combustion and Itsmentioning

confidence: 99%

Section: Enclosed Furnace Mild Combustion and Itsmentioning

confidence: 99%

Review on MILD Combustion of Gaseous Fuel: Its Definition, Ignition, Evolution, and Emissions

Wang

et al. 2021

Energy Fuels

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“…Figure 1 shows a schematic diagram of the lab-scale flameless combustion system used in this study. The system was designed to meet the purpose of the authors by referring to previous studies 19 that use internal recirculation. The O 2 fraction in the oxidant was controlled by considering O 2 and N 2 .…”

Section: Experimental Approachmentioning

confidence: 99%

Oxygen‐enriched flameless combustion of CH ₄ / H ₂ / CO mixtures

Kim

Park

Huh

et al. 2021

Intl J of Energy Research

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In the field of thermal energy, interest in carbon-free fuels, such as H 2 , is increasing to reduce greenhouse gas emissions; simultaneously, efforts are being made to reduce NO x emissions. In this study, experimental and numerical methodologies were applied to analyze the characteristics of flameless combustion under oxygen enrichment conditions for the simultaneous reduction of greenhouse gases and fine dust precursors. Flameless combustion was achieved under all conditions, and numerical simulations using GRI-mech 3.0

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“…The mean temperature, O 2 , and CO 2 predictions are found to agree well with the experimental data while CO is considerably over predicted. Primary CO production and consumption reactions in flameless combustion were identified in the work of Liu et al (2017). Accordingly, four main reactions are selected for the tuning of their kinetic parameters.…”

Section: Validation Of the Numerical Modelmentioning

confidence: 99%

Increased heat transfer to sustain flameless combustion under elevated pressure conditions – a numerical study

Khalil

Eldrainy

Abdelghaffar

et al. 2019

Engineering Applications of Computational Fluid Mechanics

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Sustaining flameless combustion under elevated pressure conditions remains a challenge that hinders its application in gas turbines. Previous attempts succeeded to sustain flameless operation up to 5 atm. In the present work, reaction rate is decreased by increasing heat transfer through combustor walls so that the reaction zone is kept distributed. Pressure is elevated from 1 to 15 atm. and its effect on reaction zone location and spread, and emissions is investigated. Two-dimensional computations are performed using ANSYS fluent package. Under adiabatic combustor wall conditions, increasing the pressure results in a more concentrated reaction zone, and a departure from flameless mode at 3 atm. The calculated Damköhler number is noticed to increase from 0.2 to 1.9. NO x emissions increases from 10 to 78 ppm. Nearly 90 % of the predicted NO x are generated via the thermal route. Under isothermal combustor wall conditions, increased heat transfer is noticed to limit the increase in heat of reaction and temperature with pressure. The calculated Damköhler number is noticed to increase from 0.12 to 0.85. This is nearly half the values encountered under adiabatic conditions, which demonstrate a distributed reaction under all pressures investigated. Finally, NO x emissions are found below 5 ppm for all pressures investigated.

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Experimental and numerical study on the CO formation mechanism in methane MILD combustion without preheated air

Cited by 30 publications

References 26 publications

Review on MILD Combustion of Gaseous Fuel: Its Definition, Ignition, Evolution, and Emissions

Review on MILD Combustion of Gaseous Fuel: Its Definition, Ignition, Evolution, and Emissions

Oxygen‐enriched flameless combustion of CH ₄ / H ₂ / CO mixtures

Increased heat transfer to sustain flameless combustion under elevated pressure conditions – a numerical study

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Experimental and numerical study on the CO formation mechanism in methane MILD combustion without preheated air

Cited by 30 publications

References 26 publications

Review on MILD Combustion of Gaseous Fuel: Its Definition, Ignition, Evolution, and Emissions

Review on MILD Combustion of Gaseous Fuel: Its Definition, Ignition, Evolution, and Emissions

Oxygen‐enriched flameless combustion of CH 4 / H 2 / CO mixtures

Increased heat transfer to sustain flameless combustion under elevated pressure conditions – a numerical study

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Oxygen‐enriched flameless combustion of CH ₄ / H ₂ / CO mixtures