I have mixed thods about this. The mad sciencetist part wants to say “let the turbo spin!” but the realistic says “wohaa let safety, simplicity and experiance take the lead”.
Ok. Lets listen to the mad sciencetist
Both of you are right. Til says you can not exceed a certain amount of gas per carbon atoms, yes, that is true. But you can substitute air oxigen with water oxigen with less nitrogen dilution, richer gas. Fuel moisture. Dont waste it, use it. Its there all along. But thats easyer sayd thain done.
Raising pressure in a gasifier will only speed the reactions, but it will not change product gas reaction equalibrium! Sayd differently, pressurise the gasifier, you wil need a smaller hearth gasifier, but the gas WILL be the same composition as a athmospheric one.
Now, the way l wuld do it.
First compress the air with a turbo. It will allso heat due to pressurisation. Heat it eaven further with exhaust gases. Then, heat it eaven further with gas from the reduction zone and you shuld end up with air preheated to near 800c. At this temperature, the efficiancy of the gasifier will be much much enlarged. No hopper condensation wuld be neaded or wanted, becouse at this energy recirculation, the extra water is neaded to substitute the air-make richer gas.
Then, the unreacted moisture will condense easyer due to pressure, resaulting in dryer gas-richer gas.
A contra working vacuum automixer-pressure equaliser mixes pressurised gas with athmospheric air in perfect ratio. The engine has no problems sucking it.
But is all this worth it? I dubt it sadly…
Well thats enough midnight brainstorming for today
Edit: in order to crack more water, one needs to add more enthalpy. Pressure does not add enthalpy! Only heat does.
Its the same as in kitchen. Salt doesent add any nutritional value to the food, but it does make it more tasty