<scp>MILD</scp>Combustion

Joannon, M. de; Sabia, Pino; Cavaliere, Antonio

doi:10.1002/9783527628148.hoc081

Cited by 9 publications

(6 citation statements)

References 27 publications

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“…Elementary processes that undergo MILD combustion influence the controlling parameters (Cavaliere et al, 2016). In particular, the reactivity under stoichiometric conditions is comparable with the one related to fuel-lean or fuel-rich conditions (de Joannon et al, 2010). It follows that reactions are homogeneously distributed (Plessing et al, 1998;Özdemir and Peters, 2001).…”

Section: Steady Diffusion Ignition: Hddi and Hcdimentioning

confidence: 92%

“…Combustion processes in which the reactants are separated yield diffusion flames and they can be obtained in a counterdiffusion reactor when it is fed with oxidant and fuel in opposite directions along the same axis. In MILD combustion, such streams can be diluted with inert species (such as combustion products) and can be heated to such high temperatures that the frozen temperature is higher than the ignition one (de Joannon et al, 2010;.…”

Section: Steady Diffusion Ignition: Hddi and Hcdimentioning

confidence: 99%

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Diffusion Ignition Processes in MILD Combustion: A Mini-Review

et al. 2020

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MILD combustion processes belong to new combustion technologies developed to achieve efficient and clean fuel conversion. The basic concept behind its implementation is the use of high levels of hot exhausted gas recirculation within the combustion chamber. They simultaneously dilute fresh reactants, to control system temperatures and pollutants emission, while promoting fuel complete oxidation. The combination of low maximum system working temperatures and high diluted mixtures with intense pre-heating delineates an oxidation process with unique chemical and physical features, such as uniformity of scalars at macroscale related to distributed reacting regions at microscale, extremely different from conventional flames. In turn, this requires the definition and characterization of new elementary processes, not ascribable to traditional deflagration or diffusive flame structures, which, in literature have been identified as "diffusion ignition." The present mini-review reports on several literature characterizations of such reactive structures under steady and unsteady conditions combining evidences from numerical, experimental, and/or theoretical studies. Both premixed and non-premixed configurations were analyzed in terms of system temperature, heat release, and species distributions as key parameters to describe the intrinsic nature of such new elementary processes. Analyses were realized changing the main system external parameters (mixture pre-heating temperature, dilution level in several feeding configurations) moving from traditional to MILD conditions. Results highlighted the "distributed ignition" nature of igni-diffusive structures, with implication on the thickness of the oxidation structures in the mixture fraction space, the presence/absence of a pyrolysis region, and the correlation of the maximum heat release with the mixture stoichiometric.

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Section: Steady Diffusion Ignition: Hddi and Hcdimentioning

confidence: 92%

Section: Steady Diffusion Ignition: Hddi and Hcdimentioning

confidence: 99%

Diffusion Ignition Processes in MILD Combustion: A Mini-Review

et al. 2020

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“…The analysis of the MILD combustion reactive structures on liquid fossil fuels were carried out for the first time by de Joannon et al . Differently from the case considered for biogas, where the presence of diluent was considered on the fuel side, the structures of interest are also those deriving from strong local mixing of heat and mass recirculation of exhaust gases and undiluted fuel, generally identified as a hot oxidant diluted oxidant configuration .…”

Section: Bioderived Combustible Liquidsmentioning

confidence: 99%

MILD Combustion and Biofuels: A Minireview

Sabia¹,

Sorrentino

Ariemma³

et al. 2021

Energy Fuels

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Even in the presence of the formidable growth of renewable energy sources, advanced combustion processes have and will continue to have an irreplaceable role as a driving force for energy market. This is indeed motivated by the same huge amount of energy that can be conveniently stored in the form of energy carriers, made available from the renewable sources. The coupling of the appropriate combustion conversion technology with locally available biofuels certainly is among the most effective solutions, now on the table, to face the decarbonization challenge. In this framework, moderate or intense low oxygen dilution (MILD) combustion is among the best candidates to support the transition toward the net zero emission target. Indeed, due to its inherent features, it is highly fuel flexible and efficient, allowing for the utilization of whatever energy carrier can be considered in the decarbonization strategy. It is also characterized by an inherent low or absent pollutant emission. The novelty of this minireview is to highlight the relevance of the kinetics involved in MILD combustion processes with particular focus on biofuels, identifying invariant temperatures, relevant for process stabilization for any energy carrier. A critical evaluation of advantages and drawbacks of the use of raw bioliquids in MILD combustion conditions is reported. Then, challenges, open questions, and future perspectives on the use of biofuel in MILD combustion are discussed.

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“…All the nozzles and exhausts were at the bottom of the furnace. This MILD combustion setup has produced data on various experiments, including fuel tests, flame tests, NO x tests, and heat exchanger tests (Christo and Dally, 2005;Colorado et al, 2009;Dally et al, 2002Dally et al, , 2004Dally et al, , 2010de Joannon et al 2009de Joannon et al , 2010Flamme, 2004;Li et al, 2011b;Lou et al, 2007;Maruta et al, 2000;Medwell et al, 2007Medwell et al, , 2008Mi et al, 2009;Mörtberg et al, 2006;Oryani et al, 2011;Park et al, 2004;Stankovic, 2006). MILD combustion technology is still not fully commercialized and well adopted in the furnace industry, thus it is very important to conduct substantial fundamental and applied research (Cavaliere et al, 2008;Danon, 2011;Li et al, 2011b;Parente et al, 2011aParente et al, , 2011b.…”

Section: Recent Trends In Mildmentioning

confidence: 99%

“…The characteristic of MILD combustion is the strong coupling between turbulence and chemistry (Parente et al, 2008) occurring at similar timescales (Galletti et al, 2007;Plessing et al, 1998), thus the turbulence-chemistry interactions should be treated with finite-rate approaches. The level of homogeneity of the mixing field (de Joannon et al, 2010) and slower reaction rates make the accurate modeling of this combustion regime challenging (Aminian et al, 2011), especially regarding the heat release rate and NO x and soot formation, thus a fundamental study on the mixing quality is required. To achieve MILD combustion the air supply has to be preheated (Wünning and Wünning, 1997).…”

Section: Recent Trends In Mildmentioning

confidence: 99%

A review of MILD combustion and open furnace design consideration

Noor¹,

Wandel²,

Yusaf³

2012

Int J Automot Mech Eng

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Combustion is still very important to generate energy. Moderate or Intense Low-oxygen Dilution (MILD) combustion is one of the best new technologies for clean and efficient combustion. MILD combustion has been proven to be a promising combustion technology in industrial applications with decreased energy consumption due to the uniformity of its temperature distribution. It is clean compared to traditional combustion due to producing low NO x and CO emissions. This article provides a review and discussion of recent research and developments in MILD. The issue and applications are summarized, with some suggestions presented on the upgrading and application of MILD in the future. Currently MILD combustion has been successfully applied in closed furnaces. The preheating of supply air is no longer required since the recirculation inside the enclosed furnace already self-preheats the supply air and selfdilutes the oxygen in the combustion chamber. The possibility of using open furnace MILD combustion will be reviewed. The design consideration for open furnace with exhaust gas re-circulation (EGR) was discussed.

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MILDCombustion

Abstract: The sections in this article are Introduction Definition and Properties Main Effects of Operative Conditions Combustion Chamber Properties Pollution Reduction/Abatement‐Effect of Diluent Nature Identification of Basic Processes in MILD Combustion Applications in Industry … Show more

Cited by 9 publications

References 27 publications

Diffusion Ignition Processes in MILD Combustion: A Mini-Review

Diffusion Ignition Processes in MILD Combustion: A Mini-Review

MILD Combustion and Biofuels: A Minireview

A review of MILD combustion and open furnace design consideration

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