Extended Application of the Moving Flame Front Model for Combustion of a Carbon Particle with a Finite-Rate Homogenous Reaction

Zhang, Jian; Zhang, Mingchuan; Yu, Jiang

doi:10.1021/ef900994k

Cited by 16 publications

(10 citation statements)

References 19 publications

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“…In Fig.8(b), it can also be observed that the peak soot volume fraction increases from 9×10 −6 , to 10.8×10 −6 and 11.2×10 −6 , as the velocity is decreased from 15, to 2.0, and 1.2 cm/s, respectively. In addition, the value and the distribution of soot volume fraction obtained by the simulation are similar to those from the experiment [23]. This is attributed to the reduced radially inward flow velocity with decreasing the coflow air velocity and the enhanced residence time.…”

Section: Resultssupporting

confidence: 76%

Computation and measurement for distributions of temperature and soot volume fraction in diffusion flames

Zhang

Lou

Xie

et al. 2011

J. Cent. South Univ. Technol.

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A combined computational and experimental investigation to examine temperature and soot volume fraction in coflow ethylene-air diffusion flames was presented. A numerical simulation was conducted by using a relatively detailed gas-phase chemistry and complex thermal and transport properties coupled with a semi-empirical two-equation soot model. Thermal radiation was calculated using the discrete ordinates method. An image processing technique and a decoupled reconstruction method were used to simultaneously measure the distributions of temperature and soot volume fraction. The results show that the maximum error for temperature does not exceed 10% between the prediction and the measurement. And the maximum error is 6.9% for soot volume fraction between prediction and measurement. Additional simulations were performed to explore the effects of global equivalence ratio on diffusion flames and the soot formation. The results display that the soot formation increases with decreasing the coflow air velocity. And the soot formation in each case appears in the annular region, where the temperature ranges from about 1 000 K to 2 000 K and the profile becomes taller and wider when the coflow air is decreased.

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Section: Resultssupporting

confidence: 76%

Computation and measurement for distributions of temperature and soot volume fraction in diffusion flames

Zhang

Lou

Xie

et al. 2011

J. Cent. South Univ. Technol.

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“…The three heterogeneous reactions, as listed below, were assumed to occur at the particle external surface with first-order global Arrhenius kinetics . The overall carbon consumption rate equals the sum of the rates from each individual surface reaction normalC false( normals false) + 0.5 normalO 2 → CO normalC false( normals false) + CO 2 → 2 CO normalC false( normals false) + normalH 2 normalO → CO + normalH 2 q = prefix∑ j = 1 3 q j = P normalg , normalO 2 1 K normalS , 1 + 1 K normald , 1 + P normalg , CO 2 1 K normalS , 2 + 1 K normald , 2 …”

Section: Methodsmentioning

confidence: 99%

“…2 The overall carbon consumption rate equals the sum of the rates from each individual surface reaction. 39 + → C 0.5O CO (s) 2…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Computational Fluid Dynamics Modeling on the Air-Firing and Oxy-fuel Combustion of Dried Victorian Brown Coal

et al. 2013

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The numerical modeling of the combustion of air-dried Victorian brown coal in O 2 /N 2 and O 2 /CO 2 mixtures with 21−30% O 2 has been conducted via the use of computational fluid dynamics (CFD), ANSYS FLUENT 13.0, with the refined weighted-sum-of-gray-gases model (WSGGM), the single-film model with multiple surface reactions (i.e., char-O 2 , char-CO 2 , and char-H 2 O) for char particle, and the refined two-step mechanism for the oxy-firing of methane to mimic the volatile oxidation. The purpose of this study is to verify the experimental observations in a lab-scale drop-tube furnace (DTF) and to promote the understanding on the details underpinning the combustion characteristics of Victorian brown coal, the youngest coal in the world and the single largest source for power generation in Victoria, Australia. As confirmed, the modeling results show good agreement with the experimental measurements on the particle temperature, coal ignition delay photographed by a high-speed camera, carbon burnout rate, and particle velocity. The air-dried Victorian brown coal bears an extremely high reactivity for devolatilization and char-O 2 and char-CO 2 reactions. The inherent moisture in coal was released with volatile matter simultaneously rather than as that predicted by the CFD wet combustion module for pulverized coal with surface moisture. Increasing the secondary gas temperature greatly narrowed coal ignition delay caused by the substitution of 21% O 2 balanced in CO 2 for air. At the furnace temperatures of 1073 and 1273 K, the contribution of char-CO 2 to coal burnout reached approximately 10 and 25% in the oxy-fuel mode, respectively, which, in turn, reduced the coal particle temperature by a maximum of 300 K. To achieve an identical flue gas temperature with the air-firing case, the use of 30% O 2 in CO 2 is essential. However, the radiation heat flux match can be achieved by the substitution of 27% O 2 in CO 2 for air.

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“…Surface reactions, as listed in Table 4, are solved in the CFD code by using first-order global Arrhenius kinetics [7] and the multiple surface reactions model [1]. Sum of the carbon consumption rates from each individual surface reaction equals to the total carbon consumption rate at the computational volume [17]. …”

Section: Numerical Model Of the Eafmentioning

confidence: 99%

CFD modeling of carbon combustion and electrode radiation in an electric arc furnace

Yiğit

Büyükkaya

Durmaz

et al. 2015

Applied Thermal Engineering

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Extended Application of the Moving Flame Front Model for Combustion of a Carbon Particle with a Finite-Rate Homogenous Reaction

Cited by 16 publications

References 19 publications

Computation and measurement for distributions of temperature and soot volume fraction in diffusion flames

Computation and measurement for distributions of temperature and soot volume fraction in diffusion flames

Computational Fluid Dynamics Modeling on the Air-Firing and Oxy-fuel Combustion of Dried Victorian Brown Coal

CFD modeling of carbon combustion and electrode radiation in an electric arc furnace

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