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20.2.6 $SO_2$ and $H{_2}S$ Production from Coal

For coal, it is assumed that sulfur is distributed between the volatiles and the char. Since there is no reason to assume that S is equally distributed between the volatiles and the char, the fraction of S in the volatiles and the char should be specified separately.



$SO_2$ and $H{_2}S$ from Char


The source of $SO_2$ and $H{_2}S$ from the char is related to the rate of char combustion:


$\displaystyle S_{\rm char, i}$ $\textstyle =$ $\displaystyle \frac{S_{c} \; Y_{\rm S, char} M_{w,{\rm i}}}{M_{w,{\rm S}} V}$ (20.2-10)


where $S_{c}$ = char burnout rate (kg/s)
  $S_{\rm char, i}$ = source of $i$ (kg/m $^3$-s) in char, where $i = SO_2$ or $H{_2}S$
  $Y_{\rm S, char}$ = mass fraction of sulfur in char
  $V$ = cell volume (m $^{3}$)



$SO_2$ and $H{_2}S$ from Volatiles


The source of $SO_2$ and $H{_2}S$ from the volatiles is related to the rate of volatile release:


$\displaystyle S_{\rm vol, i}$ $\textstyle =$ $\displaystyle \frac{S_{\rm vol} \; Y_{\rm S, vol} M_{w,{\rm i}}}{M_{w,{\rm S}} V}$ (20.2-11)


where $S_{\rm vol, i}$ = source of volatiles originating from
      the coal particles into the gas phase (kg/s), where $i = SO_2$ or $H{_2}S$
  $Y_{\rm S, vol}$ = mass fraction of sulfur in the volatiles
  $V$ = cell volume (m $^{3}$)


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