[Gasification] CO2 recycling

[Hararat]

Interesting that hydrogen is raised as useful in IC's for its high flame speed.  i have found that the GE Jenbacher folks hate it as it reduces the Methane nuber so much that it makes knocking a super pain in the engine.  
There is a greater value in the Kalle use of the Monotrator for improving the exploitation of the pyrolysis gases in the combustion zone by letting the condensate return to the combustion zone outside of the reacting bed.  
This helps avoid making them refractory as they travel downwards in a downdraft bed.  Of course Kalle et al used eductors, the monorator, etc quite effectively in this manner.  Better overall carbon conversion is the ultimat goal of downdraft gasification and the sneaking by of these volatiles helps present them to the combuastion zone in a more easily converted form.  Slower pyrolysis has shown to produce a gas rich in benzene as well so hence the separation of an updraft due to evaporation of bouyant gases below the top of the fuel bed in a slower manner produces a nice gasoline like product for combustion in an IC engine.  
The GEM folks have been using their pyrolyzers quite effectively in this application.  Carbon conversion suffers however.  
And so the old 'tried and true' basic thermodynamic laws and principles you mention are still valuable in this brave new world of 'dilithium crystals' and 'warp drives'.


Harry John Gatley, P.Eng.