Small size burner combustion stabilization by means of strong cyclonic recirculation

Joannon, M. de; Sabia, Pino; Sorrentino, Giancarlo; Bozza, Pio; Ragucci, Raffaele

doi:10.1016/j.proci.2016.06.070

Cited by 41 publications

(21 citation statements)

References 26 publications

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“…The test facility used in this study is a lab-scale burner extensively described in previous works. ,, The core of the facility is a prismatic chamber (20 × 20 × 5 cm 3 ), schematically reported in Figure .…”

Section: Experimental and Numerical Methodsmentioning

confidence: 99%

“…Reactants are fed to the reactor by means of two couples of straight ducts located in the two opposed corners of the combustion chamber, thus producing a cyclonic flow field within the combustion chamber. ,, The establishment of a cyclonic flow field ensures a strong internal recirculation of mass and sensible enthalpy, diluting the fresh reactants and increasing the temperature above the autoignition one. The resulting formation of hot gas/fresh reactant mixtures with local conditions of high dilution and preheating allow for the achievement of MILD combustion conditions.…”

Section: Experimental and Numerical Methodsmentioning

confidence: 99%

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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: Experimental and Numerical Methodsmentioning

confidence: 99%

Section: Experimental and Numerical Methodsmentioning

confidence: 99%

Alcohols as Energy Carriers in MILD Combustion

Ariemma

Bozza²,

Joannon³

et al. 2021

Energy Fuels

View full text Add to dashboard Cite

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“…Different configurations have been considered, from laboratory to domestic to industrial scale. A very effective configuration is the one based on a cyclonic flow configuration on a small scale. , The authors deeply studied ammonia MILD combustion in this burner, identifying the range of stability in terms of the equivalence ratio, initial temperature, and power intensity. It has been proven that, in this condition, ammonia combustion can be stabilized in a wide range of equivalence ratios, from 0.4 up to 1.8.…”

Section: Applicationsmentioning

confidence: 99%

Review on Ammonia as a Potential Fuel: From Synthesis to Economics

et al. 2021

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Ammonia, a molecule that is gaining more interest as a fueling vector, has been considered as a candidate to power transport, produce energy, and support heating applications for decades. However, the particular characteristics of the molecule always made it a chemical with low, if any, benefit once compared to conventional fossil fuels. Still, the current need to decarbonize our economy makes the search of new methods crucial to use chemicals, such as ammonia, that can be produced and employed without incurring in the emission of carbon oxides. Therefore, current efforts in this field are leading scientists, industries, and governments to seriously invest efforts in the development of holistic solutions capable of making ammonia a viable fuel for the transition toward a clean future. On that basis, this review has approached the subject gathering inputs from scientists actively working on the topic. The review starts from the importance of ammonia as an energy vector, moving through all of the steps in the production, distribution, utilization, safety, legal considerations, and economic aspects of the use of such a molecule to support the future energy mix. Fundamentals of combustion and practical cases for the recovery of energy of ammonia are also addressed, thus providing a complete view of what potentially could become a vector of crucial importance to the mitigation of carbon emissions. Different from other works, this review seeks to provide a holistic perspective of ammonia as a chemical that presents benefits and constraints for storing energy from sustainable sources. State-of-the-art knowledge provided by academics actively engaged with the topic at various fronts also enables a clear vision of the progress in each of the branches of ammonia as an energy carrier. Further, the fundamental boundaries of the use of the molecule are expanded to real technical issues for all potential technologies capable of using it for energy purposes, legal barriers that will be faced to achieve its deployment, safety and environmental considerations that impose a critical aspect for acceptance and wellbeing, and economic implications for the use of ammonia across all aspects approached for the production and implementation of this chemical as a fueling source. Herein, this work sets the principles, research, practicalities, and future views of a transition toward a future where ammonia will be a major energy player.

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“…23,43−46 However, heat loss effects play an influential role in furnace-like burners because of the confinement and longer residence time of internal EGR systems. 47,48 Internal EGR is also the cause of the high content of the absorbing and emitting mixture of H 2 O/CO 2 inside the combustion chamber, 49 which poses further modeling challenges for MILD combustion.…”

Section: ■ Introductionmentioning

confidence: 99%

Numerical Investigation of Moderate or Intense Low-Oxygen Dilution Combustion in a Cyclonic Burner Using a Flamelet-Generated Manifold Approach

et al. 2018

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Small size burner combustion stabilization by means of strong cyclonic recirculation

Cited by 41 publications

References 26 publications

Alcohols as Energy Carriers in MILD Combustion

Alcohols as Energy Carriers in MILD Combustion

Review on Ammonia as a Potential Fuel: From Synthesis to Economics

Numerical Investigation of Moderate or Intense Low-Oxygen Dilution Combustion in a Cyclonic Burner Using a Flamelet-Generated Manifold Approach

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