Kinetics of gasification of coal char with CO2 in a rotary reactor

  • Mehrotra S
  • Brimacombe J
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Abstract

The kinetics of gasification of coal chars with C02 in a rotary reactor have been investigated. The effects of process parameters like temperature, particle size, composition of the reactant gas, gas flowrate, etc., have been examined. The apparent activation energy for the reaction is found to be ~1 0 kcal (g mol)-1. Such a low value indicates that the mixing between the solids and the reactant gas is rate limiting rather than the chemical reaction. With the help of some simulated room temperature experiments it has been established that the transverse bed motion in a rotary vessel undergoes changes (from rolling to slumping, sliding, etc.) during the course of the reaction due to the variations in: (a) morphology of char particles, (b) composition and degree of fill of the reactor, and (c) coal/ash ratio. These changes in bed behaviour influence the mixing of solids and therefore heat and/or transfer to and within the bed of char particles. Experimentally observed reaction rates have been explained taking into consideration bed motion, surface area changes during the course of the reaction, and the effect of ash formation

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Authors

  • S P Mehrotra

  • J K Brimacombe

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