Alternate Heating wood gun E100 SF, Installation And Operator'S Manual

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will have been dried down so that gasi cation can
occur at a very rapid rate when the unit resumes
active ring. Under these conditions there may be
insu<cient oxygen present to adequately burn all the
gas, which results in limited to extensive (and
repeated) back pu<ng.
Long burn cycles will also lead to accumulation of
charcoal in the fuel storage area. Excess charcoal will
tend to block airGow through the slots in the center
brick. Furthermore, so9, crumbly charcoal can also
be pulled through the refractory, resulting in tiny,
live embers being emi7ed into the cyclone.
Very dry wood of 18% moisture content or less, or
fuel with a lot of surface area per volume such as
slab wood or kiln-dried scrap from manufacturing, is
likely to produce back pu<ng as well.
e optional
secondary dra9 tube is one option to help alleviate
this problem when burning wood that is very dry.
Preferred options follow, as included in this
backpu<ng prevention/resolution checklist.
Back-Puffing PreventionChecklist
✔
Use fuel with higher moisture content,
✔
Load we7er fuel on the top of your fuel
charge
✔
Use a good percentage of full rounds, as large
as 10 inches or more in diameter
✔
Stack wood tightly, using a combination of
full rounds and split pieces to form a more
solid block of fuel inside the fuel chamber
✔
Utilize shorter burn cycles, to prevent over
drying of the fuel charge that occurs with
long cycles
✔
Use the EPA Side Tunnel Plug (described
below)
One way to appraise what is going on inside the
boiler is to open the air valve box during an active
ring cycle (or to look through an optional Air Valve
View Port) and observe the re. If you see Games
shooting upward inside the fuel chamber, consider
the above checklist items as your action list for
preventing back pu<ng. Remember, the Wood Gun
utilizes a down dra9 design, and optimum
combustion takes place when the Game is properly
inverted.
EPA Side Tunnel Refractory Plug
If you by preference or unplanned circumstances
must use dry fuel to re your Wood Gun, consider
use of the EPA Side Tunnel Plug.
is plug ts into
one of the side refractory tunnels, blocking passage
of hot combustion gasses.
is results in one side of
the refractory lining the bo7om of the fuel chamber
remaining comparatively cooler than the other. Less
heat on that side means a lower rate of pyrolysis, and
lower total amounts of wood gas production.
is
can alleviate backpu<ng. It may also lengthen burn
cycles, at the cost of reduced peak output. If using
your dry fuel is producing backpu<ng, or your stack
temperatures are abnormally high, use the EPA Side
Tunnel plug for improved e<ciency and less
backpu<ng.
EPA Side Tunnel Plug
EPA Side Tunnel Plug Install
- 23 -
Note: Guard against charcoal accumulation in
your Wood Gun
TM
by keeping burn cycles at less
than 10 hours. Utilize occasional short cycles, as
short as 4 hours, for good firebox management.