Pulverized coal pellets, which may be approximatedas
Chapter 14, Problem 14.30(choose chapter or problem)
Pulverized coal pellets, which may be approximatedas carbon spheres of radius ro?1 mm, are burned in apure oxygen atmosphere at 1450 K and 1 atm. Oxygenis transferred to the particle surface by diffusion,where it is consumed in the reaction C?O2lCO2.The reaction rate is first order and of the form ?O2??k?1CO2(ro), where k?1?0.1 m/s. Neglecting changes inro, determine the steady-state O2molar consumptionrate in kmol/s. At 1450 K, the binary diffusion coeffi-cient for O2and CO2is 1.71?10?4m2/s.
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