Lanny Henson's Center Fire Stove 01

Lanny Henson June 4, 2006

This modular stove is built from used metal containers.

It has a center fire burner module, a sunken 8-liter pot module, and an insulated/ chip drying top cap.
The burner and is made from an institutional food can. It takes all the ware and stress from the fire protecting the rest of the stove body.They are easy to build and can act as fuel cartridges to store fuel for quick and easy use.
The burner module, under development, adds secondary combustion air to the top of the burner.

Lanny Henson's Center Fire Stove 01Lanny Henson's Center Fire Stove 01

Lanny Henson's Center Fire Stove 01

Outer shell, inner shell, burner, pine chips, paper stuffed in hole frame.Outer shell, inner shell, burner, pine chips, paper stuffed in hole frame.
Burner Module, Sunken Pot ModuleBurner Module, Sunken Pot Module
Burner, pot, and chip dryingBurner, pot, and chip drying/top cap modules are used in heat retaining (hay box) mode.

500 gr of air-dry pine chips
boiled 6 liters 30 min after striking the match held 175 degF for 3 hours held 100 degf bath temp for 13 hours Retained 54gr clean char and There is 35gr of ash and small char

Sun dried pine chips, top lit burned with a clear exhaust most of he time but had a short period of dark whiffs of smoke near the end of the gasification stage. The secondary air supply needs further development.

At the end of gasification there was only char so I shut the air intakes and capped the system with a chip-drying module.
This saved the charcoal and retained the heat like a hay box.
Insulation would improve the performance.

These photos show he problem I had with bottom lighting moist pine chips.
After the vapors were driven off the chips burned too fast.

Fire battles cloud/high moistureFire battles cloud/high moisture
Pot module increases draft, fire shoots out of cloudPot module increases draft, fire shoots out of cloud
4 After moisture is driven off the fire burns too fast4 After moisture is driven off the fire burns too fast

Top lighting seems to work better than bottom/center lighting. As the fuel burned from the top the moisture vaporized slowly without extinguishing the fire. The moisture even seemed to stabilize the burn rate.

Lanny Henson