[Gasification] CO2 recycling

[Benjamin Domingo Bof]

Toby; Congratulations. This is the right way. I´m not having numbers for stochiometrics because are travelling but your choice of "prosyn" is very happy. Good work. Keep up.
  Regards ;Benjamin

Toby Seiler <seilertechco at yahoo.com> escribió:
  Mark, 

I'm referring to the water content in fuel, primarily in relation to design. We have discussed steam introduction and that it creates syngas (if enough energy is available) as opposed to producer gas, one endothermic and one exothermic. When the water content of fuel is discussed, the thermodynamics of the heat flow (in the reduction zone and above to a monorator for example) is much affected. 

In wood fuel the temperature of the water contained must be raised from ambient and then 1000 btu/lb added to go from liquid to vapor. All of this occurs in a gasifier using wood that has bound and free water contained in it's fuel, unlike charcoal, assumed dry. 

And there is only a certain amount of heat, thus only a limited water content of the fuel can be introduced into the burn and sustain the reaction temperature. Too much water and it goes down. If the process of making a fuels water content into steam drives the temp down, the gas quality suffers and tars are formed. The monorator is an example of a method to condense and remove excess water. Clearly an understanding of the water thermodynamics helps one understand how the monorator reduces the water content of fuel in the top of it. Similar to a stove pot lid condensing. 

The point is, water and thermodynamics play significant roles that a designer should consider. And in a two staged process, reaching 1650-1800f, the thermodynamics for indirect heating of incoming fuel, especially starting from ambient temp., may reduce the amount of air necessary to create the heat in the initial reactions. Less air, less nitrogen, less fuel consumption to get maximized H and CO gas output. The balance of carbon and water inputs being optimized for that purpose. I termed it "prosyn" gas, because it's both. Ever seen that name used before?

I'm talking about using the fuels water content to ones advantage, rather than injecting steam for a syngas, by controlling two or more fuel introductions in staged, progressively hotter reaction zones. This could be separate devices or combined, but definitely will have control over the water content of multiple fuels and various introduction points. I see no way to minimize the importance of thermodynamics when water is part of pyrolysis, contained in the fuel, it appears to matter significantly. 

Water is not a source of energy. It is an energy transfer medium, generally taking advantage of the change from liquid to vapor like a boiler or in reverse, turbine and condenser. But we are talking also about more energy to disassociate the molecules, making oxygen available to bond with carbon. A pure syngas, makes CO2 rather than CO, because to make more CO requires more carbon. In a model where carbon is supplied into the high temp. reaction for syngas, the resulting gas would appear to be CO and H maximized, because the waters 2 oxygen would bond with available carbon. If there is anyone out there that can help with the stochiometrics, please contact me. OK, I am one of those bad "implorers", seeking help. Since I admitted to Peter that I am a "seed eater", the labels accumulate. 

Best regards, Toby Seiler



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