[Gasification] Updraft gasifiers

[Javier Bonet]

Dear gasification list.

I am looking for information on making a updraft gasifier unit. similar to the one in 

www.gastechnology.org/webroot/downloads/en/IEA/WoodchipsGasifierCombinedheatandPower.pdf

This unit takes a mixture of hot exhaust gases from the running engine, and fresh air to control the amount of oxygen going into the gasifier.
Then the filtering of the dust coming from the gasifier, is filtered in the unburnt (newly introduced moist wood) saving space and cooling down the gas, they take very little oxygen into the gasifier, but a lot of moisture, after thermolysis of the steam they get, Oxygen for the combustion, and H2 gas.
Anybody has more information on this kind of gasifiers?

Thanks.