2000
DOI: 10.1016/s0082-0784(00)80631-1
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Modeling high-pressure char oxidation using langmuir kinetics with an effectiveness factor

Abstract: The global nth order rate equation has been criticized for lack of theoretical basis and has been shown to be inadequate for modeling char oxidation rates as a function of total gas pressure. The simple Langmuir rate equation is believed to have more potential for modeling high pressure char oxidation. The intrinsic Langmuir rate equation is applied to graphite flake oxidation data and agrees well with reaction rates at three temperatures over the entire range of oxygen pressure (1-64 atm). It also explains th… Show more

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Cited by 29 publications
(11 citation statements)
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“…Equation (7) has been widely used in the modelling of coal char combustion and gasification in literature [34][35][36][37][38][39]. Adanez et al [40] used the TGA data to predict the intrinsic kinetic parameters of wood chars and applied the kinetic parameters on the fluidized bed combustion boilers.…”
Section: + 2 → ( ) Error! No Text Of Specified Style In Documentmentioning
confidence: 99%
See 1 more Smart Citation
“…Equation (7) has been widely used in the modelling of coal char combustion and gasification in literature [34][35][36][37][38][39]. Adanez et al [40] used the TGA data to predict the intrinsic kinetic parameters of wood chars and applied the kinetic parameters on the fluidized bed combustion boilers.…”
Section: + 2 → ( ) Error! No Text Of Specified Style In Documentmentioning
confidence: 99%
“…A = 11581 − 393.7 + 1.441 + 3.301 2 − 0.00059 2 (37) And, for coal char with a maximum 4.63% error:…”
Section: Initial Char Apparent Densitymentioning
confidence: 99%
“…As a result, the combustion rate of coke breeze increases. Thus far, several researchers have analyzed the combustion of solid fuel in the bulk material layer , they postulate that the combustion of fuel particles within this layer is a complex reaction that is affected by the mass transfer of films, ash layer diffusion, and interfacial kinetic reaction. The reaction rate can be expressed as follows: 0trueRc=k·4πr02·COxy,1kf+δDeff+1kc,where R C is the reaction rate for the coke particles (in mol·s −1 ); k indicates the coke consumption per mole of oxygen; r 0 denotes the equivalent diameter of the coke particles (in m); C Oxy,∞ represents the oxygen concentration in the surrounding environment (in mol·m −3 ); k f corresponds to the convection mass transfer coefficient of gas through a gas film (in m·s −1 ); δ indicates ash layer thickness (in m); D eff denotes the effective diffusion coefficient of oxygen through the ash layer (in m 2 ·s −1 ); and k c corresponds to the chemical reaction kinetic coefficient (in m·s −1 ).…”
Section: Resultsmentioning
confidence: 99%
“…As a result, the combustion rate of coke breeze increases. Thus far, several researchers have analyzed the combustion of solid fuel in the bulk material layer [9,26,27], they postulate that the combustion of fuel particles within this layer is a complex reaction that is affected by the mass transfer of films, ash layer diffusion, and interfacial kinetic reaction. The reaction rate can be expressed as follows:…”
Section: Influences Of Recycled Gas Oxygen Contentmentioning
confidence: 99%
“…As the requirements of these modeling and simulation 64 activities have increased in complexity, more detail in the funda-65 mental submodels and processes is required in order for accurate 66 and relevant outcomes. Furthermore, the increasing availability 67 of high-performance computing resources has seen simulation 68 tools used regularly for understanding and optimizing the complex 69 reactive multiphase flow in coal gasification systems. CFD simula- 70 tions in particular now play an important part in the design pro- 71 cess of advanced reactors.…”
mentioning
confidence: 99%