New extended eddy dissipation concept model for flameless combustion in furnaces

Romero-Antón, Naiara; Huang, Xianfu; Bao, Hesheng; Martin-Eskudero, Koldo; Salazar-Herran, Erik; Roekaerts, Dirk

doi:10.1016/j.combustflame.2020.06.025

Cited by 43 publications

(5 citation statements)

References 47 publications

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“…As shown in Figure , the main discrepancies between simulated results and experimental measurements also exist in this region, wherein the ignition of coal particles affected by the internal recirculated flue gas cannot be perfectly simulated due to the limitations of the conventional EDC model under highly turbulent conditions. The phenomenon was also reported by other scholars. , The FGR is strengthened with the formed main stream moving downstream (0.735 m < x < 3.22 m), which effectively reduces the temperature fluctuation, hence establishing the stable MILD regime under a high-temperature ( T f > 1500 K) and strong-dilution ( K v > 2.5) environment. The axial ranges of the MILD regime and IRR are almost coincident, which demonstrates that the internal FGR is essential for achieving MILD-oxy combustion.…”

Section: Resultssupporting

confidence: 71%

“…The phenomenon was also reported by other scholars. 31,34 The FGR is strengthened with the formed main stream moving downstream (0.735 m < x < 3.22 m), which effectively reduces the temperature fluctuation, hence establishing the stable MILD regime under a high-temperature (T f > 1500 K) and strong-dilution (K v > 2.5) environment. The axial ranges of the MILD regime and IRR are almost coincident, which demonstrates that the internal FGR is essential for achieving MILD-oxy combustion.…”

Section: Mild Combustion Regime 431 Stability Limitmentioning

confidence: 99%

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MILD-Oxy Combustion Characteristics of Pulverized Coal Affected by Oxidizer O₂ Concentrations under Dry and Wet Recycle Modes

et al. 2023

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Moderate or intense low-oxy dilution oxy-fuel (MILD-oxy) combustion can synergistically reduce the emissions of CO 2 and NO x , and its industrial implementation is carried out under dry and wet recycle modes. In this work, a series of numerical simulations on pulverized coal MILD-oxy combustion under the typical dry and wet recycle modes are performed, aiming at fully evaluating the combustion behaviors affected by the oxidizer O 2 concentration (21−30%) under different recycle modes. The results show that increasing O 2 concentration weakens the in-furnace flue gas recirculation and promotes the combustion intensity, while a more uniform temperature distribution is obtained under dry recycle mode than under wet recycle mode. The diffusion/kinetics-controlled MILD regime is realized as the O 2 concentration increases. Nevertheless, the diffusion effect is enhanced due to the accelerated reaction rate under a high O 2 level. The gasification reaction is strengthened with the increased O 2 concentration. Compared with wet recycle mode, the burnout of coal char is slowed down under dry recycle mode because of the lower burnout rate. The fuel-NO conversion ratio is significantly reduced with the increased O 2 concentration, while wet recycle mode shows more potential in achieving low NO x emission than dry recycle mode. This work is expected to provide new insights into the comprehensive understanding of MILD-oxy combustion.

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Section: Resultssupporting

confidence: 71%

Section: Mild Combustion Regime 431 Stability Limitmentioning

confidence: 99%

MILD-Oxy Combustion Characteristics of Pulverized Coal Affected by Oxidizer O₂ Concentrations under Dry and Wet Recycle Modes

et al. 2023

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“…These mechanisms have also been used to develop reduced mechanisms such as DRM19 and DRM22 [34], as well as in comparisons against other, less detailed mechanisms such as KEE [35]. These reduced mechanismsparticularly DRM19-have again been used successfully to model combustion under similar hot and low-oxygen conditions [36,37,38,39], further validating the use of GRI-Mech 3.0 in the current study.…”

Section: Numerical Simulationssupporting

confidence: 57%

Characteristics of turbulent flames in a confined and pressurised jet-in-hot-coflow combustor

Proud¹,

Evans²,

Chan³

et al. 2022

Journal of the Energy Institute

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“…Hori dela eta, diluitutako erreaktiboak kontuan hartzen dituzten modelo matematikoen garapena beharrezkoa da, eta ildo horretan daude abian ikerkuntzak. Ikerkuntzak, batez ere, Eddy Dissipation Concept (EDC) modeloaren hedapenean oinarritzen dira [26]. Hala ere, Flamelet Generation Manifold (FGM) modeloak eskaintzen duen denbora konputazional aurrezpena dela eta, modelo horren hedapenean ikerkuntzak abian daude flameless errekuntza FDK bitartez aztertzeko [27] [28].…”

Section: Ondorioakunclassified

Flameless errekuntzak klima aldaketaren aurka

Antón¹,

Escudero²,

Valdes³

2021

EKAIA

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Gaur egun klima aldaketaren inguruan daukagun egoera hobetzeko, energia kontsumoa murriztu behar da eta teknologia eraginkorrak eta emisiorik gabekoak suspertu behar dira. Nahiz eta energia berriztagarrien alde apustu egin, gaur egungo datuen arabera, bai gaur egun zein etorkizunean erregai fosilen kontsumoa energia primarioa izango da. Egoera honen aurrean erregai fosiletan oinarritzen diren teknologietan ikerkuntzak egitea beharrezkoa da, teknologia berderantz bideratzeko. Klima aldaketari aurre egiteko flameless errekuntza garatua izan da. Flameless errekuntza produktuen aerodinamikan oinarritzen da, eta horiek birzirkulatuz erreaktiboak diluitu egiten dira. Honi esker O2ren kontzentrazioa murrizten da labeko gar tenperatura murriztuz. NOx gasen emisioak tenperaturarekin erlazionatuta daudenez, labe tenperatura murriztean NOxen emisioak murrizten dira. Gainera, produktuen birzirkulazioaren bitartez erreaktiboak aurre-berotzen badira, energia eraginkortasuna hobetzen da. Teknologia berri honek aplikazio zuzena izan dezake tenperatura altuko labe eta galdaretan; adibidez, potentzia termiko instalazioak, findegiak, industria kimikoak, zeramika, beira, zementu eta altzairu lantegiak, NOxen emisioak eta energia kontsumoa murriztuz. Flameless teknologia hobeto ulertzeko helburuarekin ikerlariak Fluido Dinamika Konputazionala (FDK)-ren bitartez esperimentuak eta simulazioak egiten ari dira. FDK programan dauden modeloekin ohiko errekuntzaren ezaugarriakzehaztasunez simulatu daitezke; bero transferentzia, jariakinen mekanika, erradiazio termikoa, erreakzio kimikoak eta turbulentzia-kimika interakzioa, baina ez flameless errekuntza, erreaktiboen diluzioa kontuan hartzen ez delako. Hori dela eta beste modelo berri batzuk garatu behar dira.

show abstract

New extended eddy dissipation concept model for flameless combustion in furnaces

Cited by 43 publications

References 47 publications

MILD-Oxy Combustion Characteristics of Pulverized Coal Affected by Oxidizer O₂ Concentrations under Dry and Wet Recycle Modes

MILD-Oxy Combustion Characteristics of Pulverized Coal Affected by Oxidizer O₂ Concentrations under Dry and Wet Recycle Modes

Characteristics of turbulent flames in a confined and pressurised jet-in-hot-coflow combustor

Flameless errekuntzak klima aldaketaren aurka

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New extended eddy dissipation concept model for flameless combustion in furnaces

Cited by 43 publications

References 47 publications

MILD-Oxy Combustion Characteristics of Pulverized Coal Affected by Oxidizer O2 Concentrations under Dry and Wet Recycle Modes

MILD-Oxy Combustion Characteristics of Pulverized Coal Affected by Oxidizer O2 Concentrations under Dry and Wet Recycle Modes

Characteristics of turbulent flames in a confined and pressurised jet-in-hot-coflow combustor

Flameless errekuntzak klima aldaketaren aurka

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Product

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MILD-Oxy Combustion Characteristics of Pulverized Coal Affected by Oxidizer O₂ Concentrations under Dry and Wet Recycle Modes

MILD-Oxy Combustion Characteristics of Pulverized Coal Affected by Oxidizer O₂ Concentrations under Dry and Wet Recycle Modes