A mathematical model of a one-dimensional char flame: A comparison of theory and experiment

Xieu, Diep V.; Masuda, Tomiyoshi; Cogoli, J.G.; Essenhigh, Robert H.

doi:10.1016/s0082-0784(81)80149-x

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…It was found that the higher reaction rate of CO from Sobolev’s kinetics was needed to accurately reproduce the experimental results. In addition, perhaps, most of the researchers who used the thermal explosion theory to predict the ignition temperature of a carbon particle assuming CO 2 as the only product of the surface oxidation − need Sobolev’s kinetics to support too.…”

Section: Further Discussion On Co Flame Appearance For Small Carbon P...mentioning

confidence: 99%

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

Zhang

2009

Energy Fuels

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The moving flame front (MFF) model with the assumption of an infinitely fast homogeneous reaction was successfully extended to use in the finite-rate cases, applying the concept of "characteristic combustion rate of CO relative to its generation" and a universal "effectiveness-transforming formula". The predictions by the amended MFF model agree well with those by the rigid continuous-film model, no matter what kinetics of the homogeneous reaction are taken and no matter what the particle diameters are. In addition, the prediction of the particle ignition temperature is accurate too. Under certain conditions, the CO flame may yet appear in the boundary layer of a small carbon particle less than 100 μm burning in air, which was confirmed by the Fourier transform infrared (FTIR) online measurement experiment and detailed modeling work using Sobolev's kinetics of CO oxidation directly measured at the flame front rather than in postflame regions.

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Section: Further Discussion On Co Flame Appearance For Small Carbon P...mentioning

confidence: 99%

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

Zhang

2009

Energy Fuels

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“…Besides the overall temperature field, ignition position is another important parameter for burner design. Previous studies (e.g.,) showed that ignition temperature of pulverized coals is around 900–1000 °C. In the present study, provided temperature profiles were measured in the experiments, isothermal curves at 1173 K (900 °C) are convenient to be adopted as ignition position.…”

Section: Resultsmentioning

confidence: 99%

Modeling of Pulverized Coal Combustion in Turbulent Flow with the Consideration of Intermediate Reactions of Volatile Matter

et al. 2013

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The eddy dissipation concept (EDC) model with the consideration of the intermediate reactions for the volatile matter (VM) combustion was applied to simulate turbulent pulverized coal/air jet combustion adjacent to a bluff-boy type model burner. The VM of the coal was assumed to consist of CO, H2, and CH4, and its chemistry was described by a 16-speices and 41-step skeletal mechanism for CH4/air combustion. The model was compared with some other conventionally used ones, including the eddy dissipation (ED) model, eddy dissipation or finite rate (ED-FR) model, mixture fraction probability density function (MF-PDF) model, and the EDC model with a global reaction mechanism for gas phase combustion (EDC_G), in predicting temperature profiles, maximum flame temperature, flame shape, and ignition position and in CPU cost. The predicted temperature profiles and flame positions were further compared with reported experimental data. It was found that the EDC model with the consideration of the intermediate reactions for VM combustion improved prediction in the temperature field and thus ignition position. With the adoption of the full in situ adaptive tabulation (ISAT) method, two-third of the overall CPU time could be saved, making the EDC model more acceptable in comparison with the ED-type models and MF-PDF model. On the basis of the simulation results, it is suggested that intermediate reactions of the VM should be considered when high accuracy of flame temperature and ignition position prediction is desired in simulation of pulverized coal combustion.

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“…В табл. 1 приведені вихідні та розрахункові дані для ряду частинок різних коксів [15][16][17][18][19][20]. Відмінністю результатів цих досліджень серед великої кількості аналогічних даних, які узагальнюються в роботах [2, 3], є наявність залежностей типу (1) без використання насипної густини для вугільного пилу.…”

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Features of burning's porous coal coke particles

Черненко¹,

Калінчак²,

Батуріна³

2020

ФАС

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Особливості вигорання поруватих частинок коксу вугілля Проводиться порівняння емпіричних і теоретичних залежностей густини частинки коксів від її діаметру при її горінні. На відміну від усталених уявлень, що всередині частинки в порах кисень дифундує переважно кнудсенівською дифузією, при порівнянні з чисельними розрахунками показано, що всередині пор повинна відбуватися переважно об'ємна дифузія. Кисень не встигає потрапляти всередину перехідних і мікропор. Для певної області горіння (високе значення внутрішнього дифузійно-кінетичного відношення Se v > 5) отримано аналітичний вираз, що описує зв'язок між густиною і діаметром частинки в припущенні молекулярної дифузії кисню всередині пор частинок коксу. Показано, що, при горінні частинок вугільного пилу з діаметром менше 150 мкм значення Se v можуть були менші за 5. По визначеному показнику степеня в отриманій залежності можна визначити значення ефективної питомої поверхні пор коксу вугілля.

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A mathematical model of a one-dimensional char flame: A comparison of theory and experiment

Cited by 5 publications

References 9 publications

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

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

Modeling of Pulverized Coal Combustion in Turbulent Flow with the Consideration of Intermediate Reactions of Volatile Matter

Features of burning's porous coal coke particles

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