Diffusion and Reaction in a Stagnant Boundary Layer about a Carbon Particle

Caram, Hugo S.; Amundson, Neal R.

doi:10.1021/i160062a001

Cited by 172 publications

(88 citation statements)

References 9 publications

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“…Of course both rate equations do not fit the experimental data above 700°C where combustion rate is under external diffusion control. 17) and Uebo experimental data.…”

Section: Combustion Under Isothermal and Air Controlled Flow Conditionsmentioning

confidence: 99%

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Coke Oven Carbon Deposits Growth and Their Burning Off

Zymla¹,

Honnart²

2007

ISIJ Int.

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“…Of course both rate equations do not fit the experimental data above 700°C where combustion rate is under external diffusion control. 17) and Uebo experimental data.…”

Section: Combustion Under Isothermal and Air Controlled Flow Conditionsmentioning

confidence: 99%

“…17,18) The first model assumes that the only reaction in the system is a heterogeneous reaction of oxygen with solid carbon on its nonporous surface: CϩO 2 ϭCO 2 . Its rate depends on relative contribution of surface reaction kinetics (intrinsic reaction) and external (gas film) diffusion steps.…”

Section: Introductionmentioning

confidence: 99%

Coke Oven Carbon Deposits Growth and Their Burning Off

Zymla¹,

Honnart²

2007

ISIJ Int.

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“…The rate of gas-solid oxidation on the surface of a biomass particle was taken from Arrhenius expression. (6), (26) . Table 3 Representative 38 reactions with N-species and 2 gasification reactions…”

Section: ……… (1)mentioning

confidence: 99%

Study on the N2O Formation under Low Temperature Condition in Pulverized Biomass Combustion

Okumura

Watanabe

Okazaki

2012

JTST

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The purpose of this study is to clarify the fundamental and general features of N 2 O formation during the combustion of pulverized biomass under low temperature. First, the effect of various important factors, i.e., combustion temperature, volatilization process (i.e., either slow or rapid dispersion), and nitrogen content in biomass on N 2 O formation were investigated by theoretical analysis. The analysis of the effect of combustion temperature on the formation of nitrous oxide showed that N 2 O emission level increases with the decrease in combustion temperature, and both N 2 O and NO levels are strongly dependent on the combustion temperature. In other words, there is a trade-off relationship between the formation of NO and that of N 2 O. The analysis of the effect of the slow/rapid volatilization process on the formation of nitrous oxide showed that the conversion ratio of biomass-N to N 2 O increases with the decrease in the dispersion of volatile matter per unit time; it means that biomass-N is effectively converted to N 2 O during slow volatilization. Further, the gasification reactions between CO 2 , O 2 , and C occur simultaneously on the surface of biomass particles during combustion. With respect to the effect of nitrogen content in biomass, the N 2 O emission level increases with the increase in N-content of the biomass, while the NO emission level remains constant during low-temperature combustion.

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“…The rate at which carbon particles burn in a fluidized bed of inerts has often been studied [3,[21][22][23][24]. Guedes de Carvalho et al [20] used coke and char particles (with d Ͼ 1 mm) and proved that the oxidation of CO to CO 2 occurs outside the boundary layer for oxygen diffusion.…”

Section: Transfer Rate During Bubble Formationmentioning

confidence: 99%