[Stoves] iCan Trash Can Style - very clean burning

Mon May 26 12:43:35 CDT 2014

iCan in its trash can.  It would look like this in full operation also.
They only evidence that it is operating is a shimmering column of very hot air.
No steam is seen as exhaust gases are several hundred degrees above the boiling point.

The trash can with the three can iCan stack next to it.
The ash can makes the iCan essentially impervious to winds.  It also cause all of the
primary and secondary air to be down drafted.  This results in the air being preheated.
The position in the top can of the pot for boiling water is clearly shown.
Bottom can: reactor can w/ fuel, flame retention disk, secondary air ports
Middle can: three 2 inch deflector disks
Top can: supports for pots for boiling water.
Top two cans provided draft that greatly accelerates the secondary air.
Note the use of washers to hold the cans firmly in place.  I use three washers at the base of each can.
The small washers at the base of the reactor establish the minimum primary air gap.

Top view of a pot for boiling water in place in the flue.  The pot easily hold 750g of water.

View down thru the three cans. 
The top can holds the supports of the cooking “pots” - smaller tin cans.
The middle can holds the three deflector disks.
The bottom can is the reactor can that holds the fuel, has the secondary airports, and the 3” flame retention disk.

Looking into each of the three cans.  Reactor can in the center with flame retention disk in place.
The disk lifts out for fueling and charcoal removal.

Details of the BOTTOMS of the deflector can, left, and the reactor can on the right.
The primary air holes in the outer and inner rings are made with 7/64s bit.  
The middle ring holes are made with a 1/8th inch bit. Size matters.
This configuration would likely need to be adjusted for each fuel type.

The bottom of the pot after 29 minutes over 600 grams of softwood pellet fuel.
No creosote. A very thin layer of grey soot that easily rubs off.
The sides also had a very light, easily removed, coating of light gray soot. The soot layer is barely visible.
I had to carefully tilt the can into the sun to make it easily visible.

Indication of the heat generated by the system.

The three nuts make centering the flame retention disk very easy.

Ideally, the reactor can would be of high temperature stainless and the primary air holes would
 be on an interchangeable plate that dropped into the bottom of the reactor.  Dartmouth College
has such a design in a fan assisted TLUD in a 35 gallon drum.  The Dartmouth unit runs well
on dry saw dust.

The relatively small number and size of the primary air holes is a very important design function.
They approach the limit of the least amount of air required for a well balanced combination of:
run time, system temperature levels, water boiling times, and biochar yield
 - all with no creosote and vanishingly small amounts of soot deposited on the water container.

Notes:

1. 250g of water put on fire at the 5 minute mark.  Water boiled in 11:35.  At end, 49% of the watery had been boiled off.

2. At 10 minutes, the stack gases exiting around the can were 550f, @ 20 minutes 770f, peak temp reached 971 degrees at ~28 minutes.

3: Run time on 600 grams of softwood wood pellet fuel was 34.5 minutes

4. Biochar yield was ~ 19% - as weighed hot at end of the run.

5. No flames or soot were seen to exit the top can.

Jock Gill
P.O. Box 3
Peacham,  VT 05862

+1 (802) 503-1258

Stewardship, not dominion

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