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*New* video of large gasifier operation HERE
Poor man's large gasifier Instructible
MIDGE small tin can gasifier Instructible
This is the documentation of my largest gasifier experiment so far.
This unit costs about $50 to make.
After building a MIDGE stove, I wanted to design something with bigger,better performance.
It also needed to be a design that could be copied easily. All parts must be commonly available. Tools should be kept to a minimum.
This gasifier can be built in two quality levels. The prototype is identical to this silver aluminum model but is made from a large popcorn can using no power tools.
The output of this stove is very high. A very rough estimate might be 30-40,000 BTU. Don't quote me on that though. It can boil 5 gallons of water in 30 minutes. I've also mounted it under a 30 gallon gas water heater. After an hour and a half of runtime the water inside reached 150 deg. F
The stove will run for 1 hour without "in flight refueling". Wood pellets are the preferred fuel but literally anything "woody" can be burned in the stove. This stove burns material from the top down.
If burning wood scraps like 2x4 and pallet chunks, pack the wood in tight and cover with a layer of wood pellets. The top layer of pellets will create the initial layer of coals you need for nice combustion.
Much more can be said about stove operation. I will document some of this as I go on. Once you build the stove and run a few times on wood pellets, the operation becomes more obvious. When operated correctly there should be NO SMOKE emitted.
There are somewhat dangerous fumes produced by this size stove so don't use it indoors. Treat this device like a literal "campfire in a can".
TLUD stoves such as this are very safe in operation for the most part. The top ring of the burn pot gets incredibly hot (230 deg. +) but the sides stay cool (100 deg. or so) for the rest of the burn.
My stove uses a regular common computer fan for air supply. A centrifugal blower style fan is preferred but an axial fan can be used successfully if you make a straight duct and attach to the outer pot. Blower fans can be found surplus or can also be found in some Dell tower computers.
Improvise and adapt!
Now on to the plans........
Step 1: Gather tools and parts
- Dremel tool with fiberglass cutoff wheel
- Corded or cordless drill
- DeWalt 1/8 or 9/64th titanium drill bit
- 12 quart aluminum stock pot (buy quality restaurant grade with thick lid)
- 4 quart stainless steam table pot with "inset" top (Libertyware IP04 or Vollrath?)
- 6 quart stainless steam table pot bain marie(Libertyware BM06 or Vollrath ?)
- 12 sheet metal screws (pref. stainless)
Libertyware website w/part numbers:
Optional (if you can't cut the main hole perfect):
- wood stove cement
- high temperature RTV sealant
- Thermo Steel high heat putty
Optional tools for cutting main holes:
- Makita die grinder GD0601
- Clesco M-3 wheel mandrel set (Holder for 3" stainless cutting discs. Can be used with Makita or corded drill)
- 3" fiberglass cut off wheels (Any brand with these specs will do. 3/8" center hole preferred)
These pots should be bought from a real restaurant supply store (or come from a restaurant).
I used Libertyware (Indian made), but Vollrath (USA) should work also. The Vollrath "inset" 4 quart is shaped differently I believe. Test fit before buying.
The burn pots are stainless, this is the only durable way to go. Use DeWalt or equivalent drill bit that is capable of drilling stainless. The point angle of the drill bit really matters. A Rigid brand cryo cobalt bit did NOTHING. It literally melted trying to drill the thin stainless. DeWalt titanium went through like drilling butter. It was a night and day difference. Will give part number of drill bit later. It's common at any Home Depot.