Pressure dependence of NO formation in laminar fuel-rich premixed CH4/air flames

Essen, V.M. van; Sepman, Alexey; Mokhov, Anatoli; Levinsky, Howard

doi:10.1016/j.combustflame.2007.10.006

Cited by 15 publications

(3 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In recent years, some scholars have studied the influences of altitudes on flame temperature, length, CO emissions, and NO x emissions. Yang et al 7 pointed that the peak flame temperature decreased with increasing altitude, being consistent with the observations of Kim et al 13 and Essen et al 8 However, those results were obtained by using laminar flame at open environment, which cannot clarify the complex effect of altitude on combustion temperature within furnace. Kim et al 13 found that flame length increases with increasing altitude, but Zeng et al 9 observed the same flame heights in Lhasa and Hefei.…”

Section: Introductionsupporting

confidence: 66%

The influence of altitude on combustion characteristics within gas‐fired boiler by numerical simulation

Zhang

et al. 2023

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

The reduced atmospheric pressure and oxygen mass concentration at high altitudes have brought tremendous problems to the operation of gas‐fired boiler, mainly due to their influence on gas combustion and flow within furnace. Boilers designed for plateau region generally experience insufficient output, incomplete combustion, and reduced thermal efficiency when operating at high altitudes. However, the impacts from increasing altitude to the combustion characteristics within furnace are still ambiguous, which greatly hampers the boiler design for high‐altitude area. In this paper, the influences of altitude on the gas combustion characteristics within furnace were explored by using the computational fluid dynamics (CFD) method. The simulation shows that when altitude rises from 0 to 4000 m, the flame length and width increase as well as the temperature within furnace, but the burnout rate decreases due to the reduced residence time. The furnace length and diameter of the boiler designed for high altitudes should be appropriately increased to avoid the high temperature flame from scouring the back tube sheet and the furnace liner. While the CO emissions are generally very low, an increasing trend with altitude was observed. In addition, for each 1000 m of altitude rise, the NOx emissions increase by about 14 mg·m−3 at 100% loads and α = 1.05. The present work reveals the influence of altitude on combustion characteristics within gas‐fired boiler, which can guide the design and operation of the gas‐fired boiler at high altitudes.

show abstract

Section: Introductionsupporting

confidence: 66%

The influence of altitude on combustion characteristics within gas‐fired boiler by numerical simulation

Zhang

et al. 2023

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

show abstract

“…Results show that in high pressures, NO formation increases, and in 10% increase of diluents, NO formation is more than that in 20% increase of diluents. Temperature profiles are strongly dependent upon pressure, when the temperature changes, the rate of the reaction increases [41], which results in observed growth of the calculated NO mole fractions with pressure.…”

Section: The Effects Of Pressure and Dilution On No Formationmentioning

confidence: 99%

Effects of pressure and carbon dioxide, hydrogen and nitrogen concentration on laminar burning velocities and NO formation of methane-air mixtures

Zahedi

Yousefi

2014

J Mech Sci Technol

View full text Add to dashboard Cite

To cite this version:Peyman Zahedi, Kianoosh Yousefi. Effects of pressure and carbon dioxide, hydrogen and nitrogen concentration on laminar burning velocities and NO formation of methane-air mixtures. AbstractIn this research we have studied the effects of increasing pressure and adding carbon dioxide, hydrogen and nitrogen to Methane-air mixture on premixed laminar burning velocity and NO formation in experimentally and numerically methods. Equivalence ratio was considered within 0.7 to 1.3 for initial pressure between 0.1 to 0.5 MPa and initial temperature was separately considered 298 K. Mole fractions of carbon dioxide, hydrogen and nitrogen were regarded in mixture from 0 to 0.2. Heat flux method was used for measurement of burning velocities of Methane-air mixtures diluted with CO2 and N2. Experimental results were compared to the calculations using a detailed chemical kinetic scheme (GRI-MECH 3.0). At first, the results in atmosphere pressure for Methane-air mixture were calculated and it was compared with the results of literature. Results were in good agreement with published data in the literature. Afterwards, by adding carbon dioxide and nitrogen to Methane-air mixture, we witnessed that laminar burning velocity was decreased, whereas by increasing hydrogen, the laminar burning velocity was increased. Finally, the results showed that by increasing the pressure, the premixed laminar burning velocity decreased for all mixtures and NO formation indicates considerable increase, whereas the laminar flame thickness decreases.

show abstract

“…One of the disadvantages of this technique is the relatively long response time and the need for frequent calibration. As an alternative, optical techniques such as Laser Induced Fluorescence (LIF) have high accuracy and a relatively fast response time [13]. Although H 2 S, SO 2 and NO 2 absorbs strongly in the infrared (IR) spectral range [14], selective detection using an absorption technique such as Tunable Diode Laser Absorption Spectroscopy (TDLAS) [15] or Fourier Transform Infrared spectroscopy (FTIR) [16,17] in this spectral range is difficult due to the interference from CO 2 and other impurities present in captured CO 2 in particular H 2 O and CH 4 .…”

Section: Introductionmentioning

confidence: 99%

Detection of H2S, SO2 and NO2 in CO2 at pressures ranging from 1- 40 bar by using broadband absorption spectroscopy in the UV/VIS range

et al. 2014

View full text Add to dashboard Cite

This paper presents a methodology to quantitatively measure H 2 S, SO 2 and NO 2 fractions in gaseous CO 2 by using broadband absorption spectroscopy at 1 and 40 bar. The mole fractions of binary-and 3-component mixtures of H 2 S, SO 2 and NO 2 in CO 2 with known fractions ranging from 35-250 ppm are successfully derived from the measured absorption spectra. The difference between the fitted and experimental mole fractions is less than 10% for all studied mixtures. The results successfully demonstrate that low fractions of H 2 S, SO 2 and NO 2 in gaseous CO 2 can be accurately measured at pipeline conditions by using broad band absorption spectroscopy.

show abstract

Pressure dependence of NO formation in laminar fuel-rich premixed CH4/air flames

Cited by 15 publications

References 22 publications

The influence of altitude on combustion characteristics within gas‐fired boiler by numerical simulation

The influence of altitude on combustion characteristics within gas‐fired boiler by numerical simulation

Effects of pressure and carbon dioxide, hydrogen and nitrogen concentration on laminar burning velocities and NO formation of methane-air mixtures

Detection of H2S, SO2 and NO2 in CO2 at pressures ranging from 1- 40 bar by using broadband absorption spectroscopy in the UV/VIS range

Contact Info

Product

Resources

About