Fuel?????

[Glenn]

Flop hook up with Buddy Leonard. GO to one of his meetings.

[Flop]

Where is he located, north or south LA.?

[Glenn]

Contact Charv (LA) pm through the forum.

Joe Rolfe, Monroe LA
Buddy Leonard, Covington LA

[Ice Czar]

Dasifier (Twin Fired Gasifier)

was working on the injector / ejector and the baffle (between downdraft and updraft sections) earlier today

YouTube - Renewable carbon negative energy that one has a preheater for the compressed air, in the daylight section woodgas is the primary fuel being burned (the downdraft section) with charcoal production, but the jet engine night shot is the charcoal being cracked and producer gas (primarily carbon monoxide from the updraft section) also being burned
http://www.emnrd.state.nm.us/ECMD/In...pt-Klepper.pdf
(note the estimate of 860 to 968F thats the gas temperature before its ignited)

[Flop]

Ice that is a real cool design, I might have to steal that design as I do a little bronze casting on the side as well. Very interesting.

Glen, thanks for the info, I'll have to get in contact with him, Monroe is about 2hrs from me.

[Ice Czar]

I'll be starting a thread on it as soon as I get the injector built and test fire my initial prototype. Its a rather high priority as I have an art commission I need to cast but Im under no illusions that getting something tuned in to work properly may take several prototypes. After that Id like to scale it up.

[R Funk]

Ice Czar:

Interesting!!!

Couple of questions.

How do get fuel in the lower up draft section?
I assume that the fuel for bottom section is wood as well.

You talk about cracking the charcoal. Is this were you add water to split the CO2?

H20 + CO2 => H2 + CO

SAFETY NOTE:
The primary gas produced is Carbon Monoxide (CO). So be very careful!!!
I personally knew 2 people who where overcome with Carbon Monoxide at a gassifier and DIED.

[Frosty]

Interesting designs Ice Czar. Please keep us posted on your progress.

The fuel in the lower section is the charcoal that has fallen from the upper section.

The injector/ejector provides a vacuum that draws air for both the downdraft and updraft section.

Absolutely, CO is nothing to take lightly.

Frosty

[Ice Czar]

Gasification
The advantage of gasification is that using the syngas is more efficient than direct combustion of the original fuel

the advantage of a twin fired gasifier is the gas itself is hotter when its introduced into a combustion chamber (forge\kiln\furnace) when compared to updraft or downdraft gasifiers, that can be increased by employing preheated air to the upper chamber, lower chamber but most importantly (I gather ) to the injector, the heat of course is scavenged from the forge exhaust after we have used it, and with good insulation

in most gasifiers the fuel is loaded from the top, and is gravity fed
proceeding down through the following zones irregardless of the direction of the draft flow, but exactly how a twin fired or co-current counter current gasifier works makes it advantageous to our purposes of a higher temperature from a fuel with a lower energy content volume for volume than say coal.


Upper chamber (down draft section)

Drying zone
a fuel with a low moisture content to start with is advisable, one use of the exhaust after the final combustion of the gases is to heat a pre-drying kiln for your fuel, or preheating the air introduced to the top of the gasifier with a heat exchanger

Pyrolysis zone (slightly endothermic, a partially reducing or anerobic atomsphere)
the fuel meets a rising pyrolysis flame front and undergoes a chemical decomposition. Pyrolytic gas is a generally medley of organic compounds including methane, methanol, ethane, ethanol, methyl ethyl ether and a host of tars and heavier compounds formed when the sugars, cellulose and lignins in the wood are broken down by heat. Varies with the biomass selected, but gasification can also be employed with coal to coke process.The main thing to keep in mind is that there isnt really enough oxygen in this zone for complete combustion. The fuel however is finally carbonized to a charcoal and falls through the baffle to the lower chamber.


Lower Chamber

Carbon Zone
Here there is a slightly greater amount of oxygen introduced from the bottom passing threw the red hot charcoal
2C + O2 → 2CO
but tis still an oxygen lean combustion process, too much oxygen and you'd get CO2. While steam is a common element in cracking, in this case its the more general meaning of breaking the carbon-carbon bonds in this case with air.

and finally the
Ash Zone

(sorry, Im too sleepy to be more coherent than this )

[BeaverDamForge]

Any update on this? I'd like to try a setup like that, do you have any pictures? Can you share a couple details like the sizes of hole in the baffle (paint can lid?), the tube going to the firebox, and the valves?

You mention preheating in a chimney, but it looks like this would be similar to a gas forge, which usually don't have chimneys. What kind of firebox/chimney would you set up for a forge?

Thanks and Good Luck!