Impact of fuel staging on stability and pollutant emissions of premixed syngas flames

García-Armingol, Tatiana; Sobrino, Álvaro; Luciano, Ennio; Ballester, Javier

doi:10.1016/j.fuel.2016.07.086

Cited by 14 publications

(4 citation statements)

References 19 publications

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“…This increased wrinkling can result in increased flame area changes and thus enhanced combustion instabilities. These and other studies [5,[9][10][11][12][13][14] show that depending on combustor characteristics, hydrogen enrichment and fuel composition can have different effects on combustion instability. In an effort to further investigate the mechanisms that cause these variable results, recent studies have observed hydrogen enrichment effects on strain, flow field, and peak heat release locations.…”

Section: Accepted Manuscript N O T C O P Y E D I T E Dsupporting

confidence: 52%

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Effect of Hydrogen on Steady-State and Transient Combustion Instability Characteristics

Strollo

Peluso

O’Connor

2021

Journal of Engineering for Gas Turbines and Power

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This paper examines the effects of steady-state and transient hydrogen enrichment on thermoacoustic instability in a model gas turbine combustor. Measurements of combustor chamber pressure fluctuations and CH* chemiluminescence imaging are used to characterize instability at a range of operating conditions. Steady-state tests show that both mixture heat rate and hydrogen content affect system stability. At a given heat rate, higher levels of hydrogen result in unstable combustion. As heat rate increases, instability occurs at lower concentrations of hydrogen in the fuel. Transient operation was tested in two directions - instability onset and decay - and two hydrogen-addition times - a short time of 1 millisecond and a longer time of 4 seconds. Results show that instability onset processes, through the transient addition of hydrogen, are highly repeatable regardless of the timescale of hydrogen addition. Certain instability decay processes are less repeatable, resulting in cases that do not fully transition from unstable to stable combustion despite similar changes in hydrogen fuel flow rate. Flame behavior before, during, and after the transient is characterized using high-speed CH* chemiluminescence imaging. Analysis of the high-speed images show changes in flame stabilization and dynamics during the onset and decay processes. The results of this study can have implications for systems that experience variations in fuel composition, particularly in light of growing interest in hydrogen as a renewable fuel.

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Section: Accepted Manuscript N O T C O P Y E D I T E Dsupporting

confidence: 52%

“…In addition, research on the transient effects of fuel composition variation is sparse. Most of the existing fuel staging work has been limited to either steady-state staging with syngas [14],…”

Section: 𝐴−𝐵 𝑒mentioning

confidence: 99%

Effect of Hydrogen on Steady-State and Transient Combustion Instability Characteristics

Strollo

Peluso

O’Connor

2021

Journal of Engineering for Gas Turbines and Power

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“…For syngas, the lean blowout limit (LBO) varies significantly depending on the fuel composition and chemical kinetic rates. Several groups have investigated the blowout phenomena of syngas at lean burning region [19,20]. Li et.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

H2-rich syngas strategy to reduce NOx and CO emissions and improve stability limits under premixed swirl combustion mode

Samiran

Jaafar

et al. 2016

International Journal of Hydrogen Energy

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The combustion performance of H 2-rich model syngas was investigated by using a premixed swirl flame combustor. Syngas consisting mainly of H 2 and CO was blended with components such as CH 4 and CO 2 in a mixing chamber prior to combustion at atmospheric condition. The global flame appearance and emissions performance were examined for high (H 2 /CO = 3) and moderate (H 2 /CO = 1.2) H 2-rich syngases. Results showed that higher H 2 fractions in the syngases produce lower NO x emissions per kWh basis across all equivalence ratios tested. CO emissions are equivalence ratio dependent and are less affected by the H 2 fraction in the syngas. Increasing CO 2 diluent ratios result in the decrease of NO x , particularly for moderate H 2-rich syngases. In contrast, syngas without CO shows an increase of NO x with increasing CO 2 for fuel-lean mixtures. Addition of CO 2 increases the lean blowout limit of all syngases. Higher fraction of H 2 produces lower lean blowout limits due to the characteristics of high diffusivity of hydrogen molecules and high flame speed that assist in the stabilisation of the flame under flame-lean conditions. The range of blowout limits for moderate and high H 2-rich and pure hydrogen syngases under diluent ratios up to 25% were within the range of φ = 0.12-0.15.

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“…Nevertheless, the impurities of the syngas must be studied in the burner behaviour and in the material to be heated or melted. In this sense, some efforts have been focused on the development of new burners to be able to combust syngas or a mixing fuel composed by NG and syngas [20][21][22][23][24], some of them focused on the flame stabilisation [21,23,25] and the reduction of the NOx emissions through the modifications in the diameters of the injector and the fuel rate [23]. However, the use of these fuels in existing furnaces is not widespread yet, and it remains at Technology Readiness Level (TRL) 4-5 since the actual implementation of the process would require a careful redesign to enable the system dealing with the differences that exist between the conventional and the synthetic fuel in terms of heating values and density properties.…”

Section: Introductionmentioning

confidence: 99%

Digital industrial furnaces: Challenges for energy efficiency under VULKANO project

Antolín-Urbaneja¹,

González-González²,

López-Guede

et al. 2018

Journal of Energy Systems

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Under intensive industry, industrial furnaces must cope with new challenges to improve the efficiency, reliability and flexibility of their processes. As they need a great amount of energy to achieve the temperature required for heating and melting processes, many researchers have been focused on the minimization of the energy consumption. This energy optimization implies improvements, not only in the competitiveness, but also in environmental and cost performances of the process. This paper shows briefly the challenges for industrial furnaces under VULKANO project focused on the development of five approaches from the point of view of efficiency, flexibility, reliability and safety: improving refractories, investigating new recovery systems based on PCM, using alternative fuels, integrating advanced monitoring and control devices and, finally, developing a holistic tool to help the operator to make decisions. Besides, this paper describes the creation of a digital industrial furnace, regarding to digital twin term. Therefore, an analytical model comprising the burners system, the isolation structure, an energy recovery system, and the load to be heated is described. Each individual model provides the base for the development of future hybrid models, accurately parametrized through process variables, used to investigate the efficiency optimization and provide precise maintenance operation strategies.

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Impact of fuel staging on stability and pollutant emissions of premixed syngas flames

Cited by 14 publications

References 19 publications

Effect of Hydrogen on Steady-State and Transient Combustion Instability Characteristics

Effect of Hydrogen on Steady-State and Transient Combustion Instability Characteristics

H2-rich syngas strategy to reduce NOx and CO emissions and improve stability limits under premixed swirl combustion mode

Digital industrial furnaces: Challenges for energy efficiency under VULKANO project

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