Gasification of porous carbon particle by steam

Gremyachkin, V. M.; Mazanchenko, E. P.

doi:10.1134/s1990793109040125

Cited by 7 publications

(4 citation statements)

References 4 publications

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“…(1)- (10). Calculated values of temperature in the "particle -air" system were used as initial conditions for solution of eq.…”

Section: Mathematical Model and Numerical Methods Of Researchmentioning

confidence: 99%

“…Thermal emission as a result of the exothermic oxidation reaction leads to the rising of temperature on the coke surface. According to provisions of [8][9][10] it was considered that the coke part of coal particle consists of carbon after completion of thermal decomposition process. Heterogeneous ignition of carbon occurs at the achievement of critical temperature [9] on particle surface.…”

Section: Problem Formulationmentioning

confidence: 99%

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Numerical research of heat and mass transfer during low-temperature ignition of a coal particle

2015

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Numerical researches have been carried out to study the influence of air flow temperature and a fossil fuel particle rate on sufficient conditions of ignition in a "coal particle -air" system. Developed mathematical model takes into account interconnected processes of heat transfer in a coal particle and gas area, thermal decomposition of organic material, diffusion and gas-phase oxidation of volatiles, heating of a coke (carbon) and its heterogeneous ignition. The effect of low-temperature (about 600 K) ignition for a single coal particle is impossible even at variation of its rate (radius) from 0.05 mm to 0.5 mm. Nevertheless this process is possible for group of particles (two, three, et al.) situated at close-range from each other. The physical aspects of the problem are discussed.

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“…(1)- (10). Calculated values of temperature in the "particle -air" system were used as initial conditions for solution of eq.…”

Section: Mathematical Model and Numerical Methods Of Researchmentioning

confidence: 99%

Section: Problem Formulationmentioning

confidence: 99%

Numerical research of heat and mass transfer during low-temperature ignition of a coal particle

2015

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“…The rate of the reaction C + H 2 O = CO + H 2 , which is the main supplier of combustible gases, was calculated similarly …”

Section: Problem Statementmentioning

confidence: 99%

Choice of the Kinetic Scheme of Oxidation Reactions of the Gaseous Products of Coal Pyrolysis during Induction Period at Ignition of the Water–Coal Fuel Particles

et al. 2019

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A theoretical analysis of the conditions and ignition of a drop of water−carbon fuel has been carried out. A mathematical model of the ignition process has been developed, which is characterized by well-known descriptions of the processes of interaction of gaseous combustible (volatile) and oxidative (air) components near the surface of the drop (and after the particle drying). The analysis of the influence of the kinetic scheme of the process of thermochemical reaction and oxidation on the main characteristics of the ignition of drops of water−carbon fuel (ignition delay timet ign ) has been carried out. The comparison of the experimental and theoretical values has shown their good correspondence. The experiments have been carried out on the facility that provides the conditions adequate to the characteristic zones of the steam and hot water boilers. According to the results of mathematical modeling, the prognostic potential of two significantly different kinetic models of oxidation of the main gaseous combustible components of pyrolysis products (carbon monoxide CO, hydrogen H 2 , and methane CH 4 ) has been analyzed. It has been established that the one-stage model of volatile ignition describes the ignition process quite well in the induction period. The deviations in the ignition delay times obtained in the framework of two different kinetic models do not exceed 5% over the entire range of variations in the heating conditions possible in practice. The results of numerical simulation show that taking into account the multistage nature of gas-phase ignition reactions of water−coal fuel particles (oxidation of hydrogen, methane, and carbon monoxide with air oxygen) does not lead to significant (in the practice of fuel combustion processes) changes in ignition delay times.

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“…At the operative conditions required for iron oxides reduction, the thermal cracking of the carbonaceous reductant is favored, resulting in the formation of solid carbon, which undermines both the hydrogen purity and the particle reactivity. If the carbon deposition occurs, in fact, carbon can react with water during the steam oxidation step producing CO by gasification, a poison of the fuel cell catalyst [19]. Furthermore, a fraction of solid carbon can remain on the particle's surface after the water oxidation step and can block the Fe active sites, contributing to their deactivation at high number of redox cycles [20,21].…”

Section: Introductionmentioning

confidence: 99%

Efficient utilization of Al2O3 as structural promoter of Fe into 2 and 3 steps chemical looping hydrogen process: Pure H2 production from ethanol

Damizia

Bracciale

Anania

et al. 2023

International Journal of Hydrogen Energy

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Gasification of porous carbon particle by steam

Cited by 7 publications

References 4 publications

Numerical research of heat and mass transfer during low-temperature ignition of a coal particle

Numerical research of heat and mass transfer during low-temperature ignition of a coal particle

Choice of the Kinetic Scheme of Oxidation Reactions of the Gaseous Products of Coal Pyrolysis during Induction Period at Ignition of the Water–Coal Fuel Particles

Efficient utilization of Al2O3 as structural promoter of Fe into 2 and 3 steps chemical looping hydrogen process: Pure H2 production from ethanol

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