Fuel and thermal load flexibility of a MILD burner

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

doi:10.1016/j.proci.2018.09.003

Cited by 51 publications

(20 citation statements)

References 27 publications

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“…Moderate or intense low-oxygen dilution (MILD) combustion is one of the alternative technologies that may be considered for ultra-lean methane combustion, as it has the potential to oxidize low concentration fuel mixtures. The technology offers advantages in terms of improved energy efficiency and reduced pollutant emissions [6][7][8][9]. In MILD combustion, the temperature increase in the combustion process is lower than the mixture auto-ignition temperature, due to the high temperature of reactant mixture and the high-level dilution [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…The technology offers advantages in terms of improved energy efficiency and reduced pollutant emissions [6][7][8][9]. In MILD combustion, the temperature increase in the combustion process is lower than the mixture auto-ignition temperature, due to the high temperature of reactant mixture and the high-level dilution [6,7]. Moderate or intense low-oxygen dilution combustion involves mixing reactants and pre-heating the mixture, which essentially affects the thermodynamic properties and sustainability of the combustion process.…”

Section: Introductionmentioning

confidence: 99%

“…Studies on MILD combustion performance and the effects of parameters, such as fuel and thermal load, on the combustion stability have been conducted. Recently, Sabia et al [7] investigated the MILD combustion performance in a cyclonic burner as affected by mixture equivalence ratio and thermal power. It was found that the system best performs at an equivalence ratio slightly lower than one and a well identified operating temperature range for minimal pollutant emissions.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Evaluation of Potential Catalyst Savings for Ventilation Air Methane Catalytic Combustion in Helical Coil Reactors with Selective Wall Coating

et al. 2019

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During active mining operation of a gassy underground mine, large amounts of methane will be released from the mine ventilation shaft. To eliminate the harmful effects of this ventilation air methane and minimize the wastage of this potential energy resource, considerable effort has been devoted to converting this alternative fuel using catalytic combustion. This study numerically investigated the reaction performance of ventilation air methane (VAM) in helical coil tubes of various configurations utilizing a computational fluid dynamics (CFDs) approach. Several key factors affecting the catalytic combustion performance such as curvature, inlet Reynolds number, and cross-section aspect ratio were evaluated. Recalling the high cost of the catalyst used in this reaction—platinum—optimization of catalyst usage by implementing selective catalyst coating was conducted and investigated. For evaluation purposes, the reaction performance of the helical coil tube was compared to its straight counterpart. The results gave a firm confirmation of the superior performance of the helical coil tube compared to the straight one. In addition, it was found that the selective inner wall coating in the circular cross-section at a higher Reynolds number gave rise to the highest figure of merit (FoM), defined as the net energy produced per mg of catalyst platinum.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Evaluation of Potential Catalyst Savings for Ventilation Air Methane Catalytic Combustion in Helical Coil Reactors with Selective Wall Coating

et al. 2019

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“…The geometrical features and characteristics of the cyclonic burner used in this article to mimic MILD combustion conditions have been reported in previous works (de Joannon et al, 2017;Ferrarotti et al, 2019;Sabia et al, 2019;Sorrentino et al, 2019). In the following, the key features of the device are discussed.…”

Section: Experimental Test Casementioning

confidence: 97%

Evaluation of Modeling Approaches for MILD Combustion Systems With Internal Recirculation

et al. 2020

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Numerical simulations employing two different modeling approaches are performed and validated against experimental results from a moderate or intense low-oxygen dilution (MILD) system with internal recirculation. The flamelet-generated manifold (FGM) and partially stirred reactor (PaSR) closures are employed in a Reynolds-averaged Navier-Stokes (RANS) framework to carry out the numerical simulations. The results show that the FGM model strongly overpredicts temperature profiles in the reactive region, while yielding better results along the central thermocouple. The PaSR closures based on a prescribed mixing time constant, C mix , of 0.01, 0.1, and 0.5 are compared, showing that a C mix value of 0.5 is the most appropriate choice for the cases under investigation. A PaSR formulation allowing local estimation of the C mix value is found to provide improved results for both the lateral and central thermocouples. A flame index analysis, used to assess the ability of FGM and PaSR to capture intense mixing of the cyclonic burner, indicates how the FGM model predicts a typical non-premixed region after the injection zone, contrary to the experimental observation.

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“…The gas turbine is one of the power devices widely used in aerospace, marine, electricity generation, and other fields. With the increasing demands for energy conservation and emissions reduction, how to achieve efficient use of fuel in gas turbines has become a popular research direction [1,2]. Therefore, it is urgent for researchers to develop advanced technologies on combustors of gas turbines.…”

Section: Introductionmentioning

confidence: 99%

Effects of Diverging Nozzle Downstream on Flow Field Parameters of Rotating Detonation Combustor

Sun

Zheng

et al. 2019

Applied Sciences

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Featured Application: Provide basis for rotating detonation combustor applications on gas turbine.Abstract: In this study, three-dimensional numerical studies have been performed to investigate the performance of a rotating detonation combustor with a diverging nozzle downstream. The effects of a diverging nozzle on the formation and propagation process of a detonation wave and typical flow field parameters in a rotating detonation combustor are mainly discussed. The results indicate that the diverging nozzle downstream is an important factor affecting the performance and design of a rotating detonation combustor. The diverging nozzle does not affect the formation and propagation process of the rotating detonation wave, while the time of two key wave collisions are delayed during the formation process of the detonation wave. With increases of the diverging angle, the rotating detonation combustor with the diverging nozzle can still maintain a certain pressure gain performance. Both the diverging nozzle and diverging angle have great influence on the flow field parameters of the rotating detonation combustor, including reducing the high pressure and temperature load, making the distribution of the outlet parameters uniform, and changing the local supersonic flow at the outlet. Among them, the outlet static pressure is reduced by up to 88.32%, and the outlet static temperature is reduced by up to 32.12%. This evidently improves the working environment of the combustor while reducing the thermodynamic and aerodynamic loads at the outlet. In particular, the diverging nozzle does not affect the supersonic characteristics of the outlet airflow, and on this basis, the Mach number becomes coincident and enhanced.

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Fuel and thermal load flexibility of a MILD burner

Cited by 51 publications

References 27 publications

Numerical Evaluation of Potential Catalyst Savings for Ventilation Air Methane Catalytic Combustion in Helical Coil Reactors with Selective Wall Coating

Numerical Evaluation of Potential Catalyst Savings for Ventilation Air Methane Catalytic Combustion in Helical Coil Reactors with Selective Wall Coating

Evaluation of Modeling Approaches for MILD Combustion Systems With Internal Recirculation

Effects of Diverging Nozzle Downstream on Flow Field Parameters of Rotating Detonation Combustor

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