Investigation of fuel dilution in ethanol spray MILD combustion

Mahalegi, Hamed Karimi Motaalegh; Mardani, Amir

doi:10.1016/j.applthermaleng.2019.113898

Cited by 15 publications

(22 citation statements)

References 55 publications

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“…Other interesting efforts on the study of ethanol MILD combustion were conducted in laboratory units, mainly finalized to evaluate the effects of diluent and/or velocity field on the transition to a MILD combustion regime and pollutant emissions . In addition, numerical analyses were carried out to set up and demonstrate the appropriateness and challenges of the numerical approach. − …”

Section: Introductionmentioning

confidence: 99%

Alcohols as Energy Carriers in MILD Combustion

Ariemma

Bozza²,

Joannon³

et al. 2021

Energy Fuels

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Among the liquid fuels supporting the decarbonization of the energy conversion chain, alcohols play a key role. Mainly considered for engine application, their use in stationary systems designed for power generation is receiving considerable attention but requires further investigation. This work aims at demonstrating the feasibility of thermochemical conversion of low-molecular-weight alcohols, methanol, ethanol, and 1-butanol, in a small-scale unit exercised under moderate or intense low-oxygen dilution combustion conditions. The highly recirculated flow field configuration allows for the stabilization of the process over a wide range of reactor temperatures. The experimental campaign is carried out by varying the mixture equivalence ratio and the thermal power. The burner was exercised with different gas feeding configurations, namely, premixed and non-premixed. Experimental results are reported in terms of operational temperatures and pollutant emissions (CO and NO x ). For all of the fuels and thermal power, it was possible to reach NO x levels lower than 20 ppm and CO below 40 ppm for a wider range of the mixture equivalence ratio than hydrocarbon fuels. Despite similarities in the temperature profiles and CO emissions, NO x levels increase with the complexity of the alcohol molecules and their distribution is also a function of the injection strategy. Simulations in a perfectly stirred reactor and in a counterflow diffusion flame were performed to provide insights into the key factors controlling the NO x emission levels and distribution. Numerical results with a perfectly stirred reactor model show the role of NO x chemistry in determining the different emission levels of the three alcohols. On the other hand, simulations with a counterflow diffusion flame suggest that the separate reactant supply to the combustion chamber represents the key parameter in determining the experimental NO x distribution in the non-premixed mode.

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Section: Introductionmentioning

confidence: 99%

Alcohols as Energy Carriers in MILD Combustion

Ariemma

Bozza²,

Joannon³

et al. 2021

Energy Fuels

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“…In the inner reaction zone, fuel reacts in hot and rich conditions which leads to intermediate species that oxidize in the outer reaction zone. The presence of swirler as well as the use of combustion chamber geometry that allow very high recirculation ratios make the differences in inner and outer flame regions to almost disappear, as can be seen in the combustion region detected in the swirl burner by Gupta and coworkers , and Kumar et al both working in MILD combustion conditions.…”

Section: Bioderived Combustible Liquidsmentioning

confidence: 99%

“…Indeed, the overall behavior is certainly kept while the temperature ranges where the different regimes prevail may slightly change. Looking at the effect of heating value reduction on MILD combustion regime of ethanol, Karimi et al 133 studied the effect of water addition on ethanol oxidation. They pointed out that the presence of up to 5% of water in ethanol favors the establishment of MILD combustion conditions.…”

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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“…Previous studies concerning flameless combustion were mainly focused on the use of gaseous fuel [20]. This is due to the homogeneous mixture produced from the mixing process of gaseous fuel and air.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, this will allow the liquid fuel to silt at the bottom of the rig, thus reducing the efficiency of the process, and obstructing the production of flameless mode. Thus, a much more complex mixing method that involves atomization and vaporization of liquid fuel through jet spray is needed to produce a relatively homogenous mixture for combustion process [20,23,24].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Multiple Swirl Generator Inlets Circumferential Distribution to a Liquid Fuelled Ultra-High Swirl Flameless Combustion Characteristics

Kasani

Wahid

Ghazali

et al. 2020

ARFMTS

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This paper presents the experimental results of a simple cylindrical shaped, liquid fuelled flameless combustor which utilizes ultra-high swirl flow in the combustion process. 4 different swirl generator inlet configurations were tested in this work. Ethanol fuel were used during flameless mode. The experiments were conducted at equivalence ratio (F=1), with the flow rate of fuel set at 4.48*104 kg/s, and flow rate of air at 3.854*103 kg/s. The results revealed that by using all 12 tangential air inlets (swirl generator injectors), the swirl strength was reduced through evenly distributing the position of the injectors circumferentially. As a result, the combustor successfully suppressed the emission of NOx and CO to zero ppm for both gasses. It was also reported that flameless mode was established in all configurations, regardless of the swirl strength.

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Investigation of fuel dilution in ethanol spray MILD combustion

Cited by 15 publications

References 55 publications

Alcohols as Energy Carriers in MILD Combustion

Alcohols as Energy Carriers in MILD Combustion

MILD Combustion and Biofuels: A Minireview

The Effects of Multiple Swirl Generator Inlets Circumferential Distribution to a Liquid Fuelled Ultra-High Swirl Flameless Combustion Characteristics

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