Effects of CO2 and N2 Dilution on the Combustion Characteristics of H2/CO Mixture in a Turbulent, Partially Premixed Burner

Liu, Yu; Xue, Qingguo; Zuo, Haibin; Yang, Fan; Xing, Peng; Wang, Jingsong

doi:10.1021/acsomega.1c00534

Cited by 17 publications

(3 citation statements)

References 57 publications

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“…The flame reaction position changes. Second, Liu et al compared the CO 2 and N 2 dilution flames and believed that the increase in flame length was caused by the increase in momentum. Furthermore, CO 2 -diluted CH 4 /air diffusion flames were simulated based on the detailed chemical reaction mechanism of GRI-Mech 3.0 .…”

Section: Resultsmentioning

confidence: 99%

Experimental Study on OH, CH, and CO₂* Chemiluminescence Diagnosis of CH₄/O₂ Diffusion Flame with CO₂-Diluted Fuel

et al. 2022

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OH* and CH* chemiluminescence in hydrocarbon flames are often applied to characterize flame structure, equivalence ratio, strain rate, heat release rate, etc. In this study, chemiluminescence images of OH*, CH*, and CO 2 * in the CH 4 / O 2 diffusion flame were obtained using a CCD camera imaging system. The effect of CO 2 dilution on the flame structure, strain rate, and other flame characteristics of CH 4 /O 2 diffusion flame was discussed. The results show that CO 2 dilution greatly affects flame morphology and chemiluminescence intensity. There are quantitative functions between the chemiluminescence peak intensity of OH* and CH* and the CO 2 dilution level. The CO 2 * average intensity in the flame zone is better suited to characterize the dilution level than the CO 2 * peak intensity. Moreover, the strain rate of CO 2 -diluted laminar flame is defined. It is found that there is a linear relationship between the thickness of the OH* reaction zone and the square root of the strain rate.

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Section: Resultsmentioning

confidence: 99%

Experimental Study on OH, CH, and CO₂* Chemiluminescence Diagnosis of CH₄/O₂ Diffusion Flame with CO₂-Diluted Fuel

et al. 2022

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“…They observed that CO 2 dilution reduces flame height and raises the flame attachment point while also decreasing NOx emissions by lowering peak temperatures. Liu et al 13 experimentally explored the effects of CO 2 , N 2 , and CO 2 /N 2 dilution on the combustion characteristics of a turbulent, partially premixed CO/H 2 -air flame. Their results revealed that CO 2 -and CO 2 /N 2 -diluted flames have larger reaction zones compared to N 2 -diluted flames.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of the Structure and Height of CH₄ Laminar Diffusion Flames: Effects of Fuel-Side versus Air-Side Dilution

Xu,

Zhou,

Zhu

et al. 2023

ACS Omega

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The strategy for introducing diluents is a critical practical concern in diluted combustion; however, a comprehensive understanding of the effects of fuel-side dilution versus air-side dilution is currently lacking. This numerical investigation systematically studied the effects of dilution strategies on methane coflow diffusion flames, with a focus on the flame structure and flame length. Common additives in practical combustion, specifically H2O and CO2, were introduced to either the fuel or the air streams, with dilution ratios (Z) ranging from 0 to 0.2, and the impacts of four dilution strategies were quantified and ranked. Detailed simulations were conducted using a well-validated two-dimensional (2D) flame code to gain a deep understanding of OH formation, flame attachment, temperature of the burner nozzle, and flame height. Systematic analyses in terms of heat transfer, molecular diffusion, and chemical kinetics were conducted. Results demonstrate that introducing diluents into the air stream exerts a more profound influence on suppressing OH formation compared with fuel-side dilution. Moreover, air-side dilution has a negligible influence on flame attachment, while increasing Z on fuel side significantly inhibits flame attachment, and the latter behavior is attributed to the diminished mass diffusion of CH4 toward the oxidizer side. As the flame attachment weakens, it causes a consequential reduction in heat transfer from the flame base to the burner. Accordingly, the nozzle temperature exhibits a more remarkable decrease with the fuel-side dilution ratio than with the air-side dilution ratio. Simultaneously, a more profound influence of Z on flame length was observed for fuel-side dilution than for air-side dilution, and the underlying mechanisms governing these two distinct dilution strategies were theoretically elucidated.

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“…Most studies use statistical characteristics of the image pixel values, − ,− which are related to the intensity of light emissions. Additionally, other methods can also compute texture , and geometrical characteristics ,,− and flame speeds. , Before the characteristics are extracted from the image, several preprocessing techniques are used. These preprocessing techniques include the averaging of image sequences, ,, flame segmentation with thresholding, ,, noise filters, color space conversions to grayscale, and finally hue, saturation, and intensity (HSI). , …”

Section: Introductionmentioning

confidence: 99%

Optical Analysis of Blast Furnace Gas Combustion in a Laboratory Premixed Burner

et al. 2022

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The use of blast furnace gas (BFG) as a fuel provides an alternative for waste stream valorization in the steel industry, enhancing the sustainability and decarbonization of its processes. Nevertheless, the implementation of this solution on an industrial scale requires a continuous control of the combustion due to the low calorific value of BFG. This work analyzes the combustion behavior and monitoring of BFG/CH 4 blends in a laboratory premixed fuel burner. We evaluate several stable combustion conditions by burning different BFG/CH 4 mixtures at a constant power rate over a wide range of air/fuel equivalence ratios. In addition, relevant image features and chemiluminescence emission spectra have been extracted from flames, using advanced optical devices. BFG combustion causes an increase in CO 2 and CO emissions, since those fuels are the main fuel components of the mixture. On the other hand, NO x emissions decreased because of the low temperature of combustion of the BFG and its mixtures. Chemiluminescence shows that, in the case of CH 4 combustion, peaks associated with hydrocarbons are present, while during the substitution of CH 4 by BFG those peaks are attenuated. Image flame features extracted from both ultraviolet and visible bandwidths show a correlation with the fuel blend and air/fuel equivalence ratio. In the end, methodologies developed in this work have been proven to be valuable alternatives with a high potential for the monitoring and control of BFG cofiring for the steel industry.

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Effects of CO₂ and N₂ Dilution on the Combustion Characteristics of H₂/CO Mixture in a Turbulent, Partially Premixed Burner

Cited by 17 publications

References 57 publications

Experimental Study on OH, CH, and CO₂* Chemiluminescence Diagnosis of CH₄/O₂ Diffusion Flame with CO₂-Diluted Fuel

Experimental Study on OH, CH, and CO₂* Chemiluminescence Diagnosis of CH₄/O₂ Diffusion Flame with CO₂-Diluted Fuel

Comparative Study of the Structure and Height of CH₄ Laminar Diffusion Flames: Effects of Fuel-Side versus Air-Side Dilution

Optical Analysis of Blast Furnace Gas Combustion in a Laboratory Premixed Burner

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Effects of CO2 and N2 Dilution on the Combustion Characteristics of H2/CO Mixture in a Turbulent, Partially Premixed Burner

Cited by 17 publications

References 57 publications

Experimental Study on OH*, CH*, and CO2* Chemiluminescence Diagnosis of CH4/O2 Diffusion Flame with CO2-Diluted Fuel

Experimental Study on OH*, CH*, and CO2* Chemiluminescence Diagnosis of CH4/O2 Diffusion Flame with CO2-Diluted Fuel

Comparative Study of the Structure and Height of CH4 Laminar Diffusion Flames: Effects of Fuel-Side versus Air-Side Dilution

Optical Analysis of Blast Furnace Gas Combustion in a Laboratory Premixed Burner

Contact Info

Product

Resources

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Effects of CO₂ and N₂ Dilution on the Combustion Characteristics of H₂/CO Mixture in a Turbulent, Partially Premixed Burner

Experimental Study on OH, CH, and CO₂* Chemiluminescence Diagnosis of CH₄/O₂ Diffusion Flame with CO₂-Diluted Fuel

Experimental Study on OH, CH, and CO₂* Chemiluminescence Diagnosis of CH₄/O₂ Diffusion Flame with CO₂-Diluted Fuel

Comparative Study of the Structure and Height of CH₄ Laminar Diffusion Flames: Effects of Fuel-Side versus Air-Side Dilution