Abstract
This paper describes a macroscopic, isothermal model for pulverized coal combustion in a cyclone reactor. Fuel-rich gasification without steam addition is also considered through a gas-phase equilibrium treatment. Fluid mechanics are modeled by a particle force balance and a series combination of a perfectly stirred reactor and a plug flow reactor. Kinetic treatments of coal pyrolysis, char oxidation, and carbon monoxide oxidation are included. The model predicts carbon conversion efficiency and product gas composition; gasification parameters, such as cold and hot gas efficiency and product gas heating value, are calculated for fuel-rich conditions. Extensive comparisons between the model predictions and experimental results are presented. The experiments were carried out in a laboratory-scale, atmospheric pressure cyclone reactor. Air flowrates ranged from 25 to 100 kg/h, coal feed rates from 4 to 14 kg/h, and equivalence ratios from 0.67 to 2.4. The level of agreement between experiment and theory was satisfactory; discrepancies are discussed in terms of possible revisions to the model or more detailed experiments.
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