Effect of CO2 and steam gasification reactions on the oxy-combustion of pulverized coal char

Hecht, Ethan; Shaddix, Christopher R.; Geier, Manfred; Molina, Alejandro; Haynes, Brian S.

doi:10.1016/j.combustflame.2012.06.009

Cited by 218 publications

(104 citation statements)

References 35 publications

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“…The effects of carbon gasification by CO 2 (CO 2 + C s M C(O) s + CO) have been well documented, see for instance Ref. [63]. This is also in agreement with the differing strengths of the recorded pyrometric signals in air and oxy-combustion which were inserted in Eqs.…”

Section: Comparison Of Air Combustion and Oxy-fuel Combustionsupporting

confidence: 54%

Soot loading, temperature and size of single coal particle envelope flames in conventional- and oxy-combustion conditions (O2/N2 and O2/CO2)

Khatami

Levendis

Delichatsios

2015

Combustion and Flame

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Section: Comparison Of Air Combustion and Oxy-fuel Combustionsupporting

confidence: 54%

Soot loading, temperature and size of single coal particle envelope flames in conventional- and oxy-combustion conditions (O2/N2 and O2/CO2)

Khatami

Levendis

Delichatsios

2015

Combustion and Flame

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“…After the temperatures T(l) are obtained, the soot volume fractions f v (l) can be calculated from Equation (8), and the absorption coefficient κ λ (l) can be expressed using Equation (6).…”

Section: Measurement Principlementioning

confidence: 99%

“…The difference in the thermal properties of N 2 and CO 2 renders O 2 /CO 2 combustion significantly different from air combustion. Therefore, CO 2 participates in the chemical reaction and affects the combustion characteristics, altering the flame temperature, soot, and NO x formation [3][4][5][6]. Knowledge of the temperatures and soot concentrations in soot flames can provide valuable information to elucidate the processes involved in soot production.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Soot Volume Fraction and Temperature for Oxygen-Enriched Ethylene Combustion Based on Flame Image Processing

et al. 2017

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Abstract:A method for simultaneously visualizing the two-dimensional distributions of temperature and soot volume fraction in an ethylene flame was presented. A single-color charge-coupled device (CCD) camera was used to capture the flame image in the visible spectrum considering the broad-response spectrum of the R and G bands of the camera. The directional emissive power of the R and G bands were calibrated and used for measurement. Slightly increased temperatures and reduced soot concentration were predicted in the central flame without self-absorption effects considered, an iterative algorithm was used for eliminating the effect of self-absorption. Nine different cases were presented in the experiment to demonstrate the effects of fuel mass flow rate and oxygen concentration on temperature and soot concentration in three different atmospheres. For ethylene combustion in pure-air atmosphere, as the fuel mass flow rate increased, the maximum temperature slightly decreased, and the maximum soot volume fraction slightly increased. For oxygen fractions of 30%, 40%, and 50% combustion in O 2 /N 2 oxygen-enhanced atmospheres, the maximum flame temperatures were 2276, 2451, and 2678 K, whereas combustion in O 2 /CO 2 atmospheres were 1916, 2322, and 2535 K. The maximum soot volume fractions were 4.5, 7.0, and 9.5 ppm in oxygen-enriched O 2 /N 2 atmosphere and 13.6, 15.3, and 14.8 ppm in oxygen-enriched O 2 /CO 2 atmosphere. Compared with the O 2 /CO 2 atmosphere, combustion in the oxygen-enriched O 2 /N 2 atmosphere produced higher flame temperature and larger soot volume fraction. Preliminary results indicated that this technique is reliable and can be used for combustion diagnosis.

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“…With increasing temperature, the chemical equilibrium is shifted from water toward OH. Furthermore, gasification reactions of the char surface involving CO 2 and H 2 O affect the boundary layer concentration [8,29], producing CO and H 2 with the CO predominantly produced by the oxidation reaction under these conditions [30]. These chemical species are transported away from the particle surface.…”

Section: Resultsmentioning

confidence: 98%

Characterization of single coal particle combustion within oxygen-enriched environments using high-speed OH-PLIF

et al. 2015

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Effect of CO2 and steam gasification reactions on the oxy-combustion of pulverized coal char

Cited by 218 publications

References 35 publications

Soot loading, temperature and size of single coal particle envelope flames in conventional- and oxy-combustion conditions (O2/N2 and O2/CO2)

Soot loading, temperature and size of single coal particle envelope flames in conventional- and oxy-combustion conditions (O2/N2 and O2/CO2)

Measurement of Soot Volume Fraction and Temperature for Oxygen-Enriched Ethylene Combustion Based on Flame Image Processing

Characterization of single coal particle combustion within oxygen-enriched environments using high-speed OH-PLIF

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