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    STUDIA CHEMIA - Issue no. 2 / 2004  
         
  Article:   REACTIVITY OF A COAL IN GASIFICATION REACTIONS. A THERMODYNAMIC CASE STUDY.

Authors:  GAVRIL NIAC, OSSI HOROVITZ, ELENA MARIA PICĂ.
 
       
         
  Abstract:  Gibbs free energies, and equilibrium constants were calculated and zero-affinity plots were drawn based on average maceral phase composition, obtained by extrapolation of elemental content and higher heating value, to the ash content of the maceral phase, according to the two phase model of coals. Elements bound to the organic mass of coal (S, Al, Fe, Ca) were also considered. Their presence contributes to lowering the Gibbs free energy of gasification reactions. Zero-affinity plots show a much higher thermodynamic reactivity of the studied coal, as compared to graphite. Equilibrium constants (Kx) of gasification reactions for coal (Illinois No.6) approach the value 1 (ΔGTP=0) at temperatures 200-300C lower than the respective values for graphite.  
         
     
         
         
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