Effect of pressure and fuel–air unmixedness on NOx emissions from industrial gas turbine burners

Biagioli, Fernando; Güthe, Felix

doi:10.1016/j.combustflame.2007.04.007

Cited by 88 publications

(26 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Similar values have been reported in literature: Biagioli and Giithe [25] found a negative pressure exponent for "in-flame NOx" and a positive for "postflame NOx," and experimentally determined a total pressure exponent ranging from 0.1 to 0.67. (3)): At dry conditions, the average pressure exponent increases with flame temperature/equivalence ratio from " (Tflame) « 0.1 at low temperatures to x ~ 0.65 at higher flame tem peratures.…”

Section: Co Formationsupporting

confidence: 89%

Influence of Pressure and Steam Dilution on NOx and CO Emissions in a Premixed Natural Gas Flame

Göke

Schimek

Steffen

et al. 2014

Journal of Engineering for Gas Turbines and Power

View full text Add to dashboard Cite

C h ris tia n O liv e r P a s c h e r e it1In flu en ce of Pressure and S team D ilu tio n on NOx and CO Em issions in a P rem ixed N atu ral Gas F lam eIn the current study, the influence o f pressure and steam on the emission formation in a premixed natural gas flame is investigated at pressures between 1.5 bar and 9 bar. A pre mixed, swirl-stabilized combustor is developed that provides a stable flame up to very high steam contents. Combustion tests are conducted at different pressure levels fo r equivalence ratios from lean blowout to near-stoichiometric conditions and steam-to-air mass ratios from 0% to 25%. A reactor network is developed to model the combustion process. The simulation results match the measured NOx and CO concentrations very well fo r all operating conditions. The reactor network is used fo r a detailed investigation o f the influence o f steam and pressure on the NOx formation pathways. In the experi ments, adding 20% steam reduces NOx and CO emissions to below 10 ppm at all tested pressures up to near-stoichiometric conditions. Pressure scaling laws are derived: CO changes with a pressure exponent o f approximately -0.5 that is not noticeably affected by the steam. For the NOx emissions, the exponent increases with equivalence ratio from 0.1 to 0.65 at dry conditions. At a steam-to-air mass ratio o f 20%, the NOx pressure expo nent is reduced to -0.1 to +0.25. The numerical analysis reveals that steam has a strong effect on the combustion chemistry. The reduction in NOx emissions is mainly caused by lower concentrations o f atomic oxygen at steam-diluted conditions, constraining the ther mal pathway. plants [1,2] but with lower installation costs and emission levels [3]. In contrast to the complex combined-cycle plants, ultra wet gas turbines have a substantially smaller footprint. Depending on the cycle configuration, short start-up times and excellent load control capabilities can be achieved. Furthermore, the high steam content allows for low-NOx, near-stoichiometric combustor oper ation and, thus, enables postcombustion CO2 capture at low cost, since the concentration of CO2 reaches the highest possible value for air breathing gas turbines after condensation of the steam. It was recently shown for a lean premixed and for a rich-quenchlean combustor, that steam dilution significantly reduces NOx

show abstract

Section: Co Formationsupporting

confidence: 89%

Influence of Pressure and Steam Dilution on NOx and CO Emissions in a Premixed Natural Gas Flame

Göke

Schimek

Steffen

et al. 2014

Journal of Engineering for Gas Turbines and Power

View full text Add to dashboard Cite

show abstract

“…34. A more recent effort showing the effect of fuel-air mixing on NO x emissions in an industrial lean premixed gas turbine burners can be found in the work of Biagioli et al [128].…”

Section: Table 10mentioning

confidence: 98%

Fuel flexibility, stability and emissions in premixed hydrogen-rich gas turbine combustion: Technology, fundamentals, and numerical simulations

et al. 2015

View full text Add to dashboard Cite

“…It is mainly based on reactions occurring mainly behind the original heat release zone. A more detailed view [12] splits the NO x formation in a post flame and a prompt contribution with slightly different temperature scaling. The prompt NO x formation is linked to the heat release according to "N 2 O" [13,14] and the "NNH" [15] pathways as well as the "Fenimore" [16] reaction of hydrocarbon intermediates.…”

Section: Flame Chemiluminescencementioning

confidence: 99%

Chemiluminescence as diagnostic tool in the development of gas turbines

et al. 2012

View full text Add to dashboard Cite

To optimise the operation of gas turbine combustors with respect to emission, cycle efficiency and components lifetime, increased attention has to be attributed to diagnostic techniques and more flexible control schemes. Chemiluminescence is an obvious choice and a relatively easy and low cost option for such a diagnostic tool. Application examples include spectral analysis and light intensity scaling, temporal analysis studying flame dynamic effects and imaging techniques resolving spatial distribution of heat release zones, as well as combinations of the methods like phase matched imaging and tracking of ignition kernels using high speed imaging. Further fundamental work should be triggered on the nature for the excited species and their formation pathways as well as their connection to heat release and the NO x formation processes.

show abstract

Effect of pressure and fuel–air unmixedness on NOx emissions from industrial gas turbine burners

Cited by 88 publications

References 22 publications

Influence of Pressure and Steam Dilution on NOx and CO Emissions in a Premixed Natural Gas Flame

Influence of Pressure and Steam Dilution on NOx and CO Emissions in a Premixed Natural Gas Flame

Fuel flexibility, stability and emissions in premixed hydrogen-rich gas turbine combustion: Technology, fundamentals, and numerical simulations

Chemiluminescence as diagnostic tool in the development of gas turbines

Contact Info

Product

Resources

About