multi phase flow with chemical reactions in one phase
 

Dear my friends,
I have two phase flow, hot gas flow phase and granular material as an other phase. these two phase are counter flow.
Granular material phase has 6 or 7 reaction that each of them occurs due to hot gas flow dispersing to it.
No I want to model this two phase model with TwophaseEulersolver in openfoam.
How can I add chemical reactions to one phase?
or how can I add chemical reactions to flow in openFoam?
If there are another suitable solver for this problem please introduce to me.
thanks very much
Kind regards
Fateh.:):):):):)