Emissions from Oxyfueled or High-Exhaust Gas Recirculation Turbines

Amato, Alberto; Seitzman, Jerry M.; Lieuwen, Timothy C.

doi:10.1017/cbo9781139015462.012

Cited by 5 publications

(2 citation statements)

References 76 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At this low thermal power, burner exhaust temperatures measured < 1000 K for H 2based flames, influenced by the high dilution levels and heat losses to the experimental rig, evidenced by CH 4 -air flame exhaust temperature at the highest equivalence ratio (φ = 0.8), which measured only about 200 K higher. Furthermore, as described by Amato et al [31], high CO 2 and H 2 O dilution at low operating pressure will enhance radiative heat losses compared with O 2 or N 2 . Initial studies at higher P therm (25 kW) for atmospheric pressure conditions suggest extension of the H 2 -air stable operating range.…”

Section: Atmospheric Pressure Stability (125 Kw)mentioning

confidence: 91%

Experimental and Kinetic Evaluation of Pressurized Lean Premixed Hydrogen-Air Flame Stability With Carbon Dioxide and Steam Dilution

Runyon

Pugh

Giles

et al. 2020

Volume 4B: Combustion, Fuels, and Emissions

View full text Add to dashboard Cite

A study has been undertaken to experimentally and numerically evaluate the use of carbon dioxide or steam as premixed fuel additive in hydrogen-air flames to aid in the development of lean premixed (LPM) swirl burner technology for low NOx operation. Chemical kinetics modelling indicates that the use of CO2 or steam in the premixed reactants reduces H2-air laminar flame speed and adiabatic flame temperature within the well-characterized range of preheated LPM methane-air flames, albeit in markedly different proportions; for example, nearly 65 %vol CO2 as a proportion of the fuel is required for a reduction in laminar flame speed to equivalent CH4-air values, while approximately 30 %vol CO2 in the fuel is required for an equivalent reduction in adiabatic flame temperature, significantly impacted by the increased heat capacity of CO2. The 2nd generation high-pressure generic swirl burner, designed for use with LPM CH4-air, was therefore utilized to experimentally investigate the influence of CO2 and steam dilution on pressurized (up to 250 kW/MPa), preheated (up to 573 K), LPM H2-air flame stability using high-speed OH* chemiluminescence. In addition, exhaust gas emissions, such as NOx and CO, have been measured in comparison with equivalent thermal power conditions for CH4-air flames, showing that low NOx operation can be achieved. Furthermore, pure LPM H2-air flames are characterized for the first time in this burner, stabilized at low equivalence ratio (approximately 0.24) and increased Reynolds number at atmospheric pressure compared to the stable CH4-air flame (equivalence ratio of 0.55). The influence of extinction strain rate is suggested to characterize, both experimentally and numerically, the observed lean flame behavior, in particular as extinction strain rate has been shown to be non-monotonic with pressure for highly-reactive and diffuse fuels such as hydrogen.

show abstract

Section: Atmospheric Pressure Stability (125 Kw)mentioning

confidence: 91%

Experimental and Kinetic Evaluation of Pressurized Lean Premixed Hydrogen-Air Flame Stability With Carbon Dioxide and Steam Dilution

Runyon

Pugh

Giles

et al. 2020

Volume 4B: Combustion, Fuels, and Emissions

View full text Add to dashboard Cite

show abstract

“…itiated air refers to a high-preheat oxidizer stream with recycled combustion products used in various devices to reduce emissions [1,2], improve flame stability [3], improve combustion efficiency [4,5], or to achieve highenthalpy hypersonic flight conditions at ground level [6]. The presence of combustion products in the inlet oxidizer stream has been found to influence the combustion chemistry of hydrocarbon fuels.…”

Section: Introductionmentioning

confidence: 99%

Ignition Characteristics of Alternative Jet Fuels under Vitiated Conditions

Gokulakrishnan¹,

Fuller²,

Klassen³

et al. 2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

View full text Add to dashboard Cite

Atmospheric pressure flow reactor experiments were performed to investigate the ignition characteristics of Fischer-Tropsch and hydrotreated renewable JP-8 fuels under vitiated conditions in order to compare these properties to conventional JP-8. Ignition experiments were conducted with reactor temperatures between 832 K and 917 K with standard air as well as vitiated air with 17% O 2 and NO x levels varied between 0 and 755 ppmv. Experiments were also performed with jet fuel surrogate components such as n-dodecane and iso-octane to investigate the ignition behavior of normal-and iso-paraffins, respectively. Experimental measurements show that the presence of NO x in the oxidizer stream reduces the ignition delay time of jet fuels and surrogates significantly. Furthermore, the effect of NO x on iso-octane ignition delay time is more pronounced than for n-dodecane. Surrogate kinetic modeling results are also compared with the experimental data regarding the effect of NO x . Overall, the modeling results agree with trends observed for the effect of NO x on ignition delay time. However, the ignition delay time predictions for Sasol-IPK are much longer than the experimental data. This is due to the fact that the representation of isoparaffinic components in Sasol-IPK is not correctly represented by iso-octane alone.

show abstract