HomeRoast Digest


Topic: Building a smoke-eater: Some ideas (4 msgs / 85 lines)
1) From: James Gundlach
On Tuesday, January 14, 2003, at 06:30 PM, Ben Treichel wrote:
<Snip>
After Deward noted that the Z&D's smoke-eater was made with a small 
version of a wood stove honeycomb catalytic combustor,  as they call 
them,  I decided that it would be possible to build a home made 
smoke-eater that would allow someone to use smoky  roasting methods in 
the house.  These catalytic combustors are a ceramic honeycomb frame 
coated with a material that causes smoke that has a temperature of more 
than 500F to ignite.  I have looked around and found a source of a 
piece of the material that is 1.8" by 6.8" by 1" that can be bought for 
about $42.00 plus shipping.   I would build one to take the smoke from 
relatively large wok roasts.  All you would need is a cone shaped hood 
on legs to hold it high enough above the smoke generator to allow 
necessary access to roast the beans.  To the top, narrow end, of the 
cone I would attach the intake of a heat gun.  To the exhaust of the 
heat gun I would mount a tube with a section of catalytic combustor.  I 
would cut a piece off the catalytic combustor to fit in the exhaust 
tube with my diamond rock saw.  The exhaust tube would probably need 
something to disperse the heat.  Then, set the hood over the wok on the 
stove, once smoke starts, turn on the heat gun and hopefully roast 
without smoke.  It seems to work for Z&D.
It will be a while before I start this project, as if I need another 
one.  If anyone has any thoughts or ideas, I'm quite willing to listen 
while I tune the plans.
Jim Gundlach
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

2) From: Rick Farris
Jim wrote:
<Snip>
Aren't you going to gum up the insides of that heat gun pretty quickly?
Sounds to me like you need an eductor.
-- Rick
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

3) From: jim gundlach
On Monday, January 20, 2003, at 12:28 AM, Rick Farris wrote:
<Snip>
I probably could put together an eductor, I just wonder if a heat gun 
would provide the velocity needed to suck in the smoky air above the 
roasting device and maintain the heat to get the catalytic combustor up 
to 500F?  Do you know of any tables or other sources of eductor 
functioning?
Jim Gundlach
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

4) From: Rick Farris
Jim wrote:
<Snip>
No.  I only thought they existed for water (as a result of my stint in the
USN), but sometime in the last year or so an air eductor came to my notice.
I just can't remember where.
I have some more bad news, though. :-)  Besides the problem of gumming up
the heat gun, heat guns are designed to have a room-temperature input.  I'm
betting you would burn up the heating element in seconds if you were pushing
400+ air into it.
Actually, if you designed your eductor so that the main airflow from the
roaster was the "supply" air, and the heat gun output was getting sucked in,
it would probably work fine.  I'll bet all you would have to do is cut an
oval shaped hole in your main airflow pipe, and then cut the pipe coming
from your heat gun at a 30-angle, or so, and weld/solder it onto the oval
opening...
-- Rick
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast


HomeRoast Digest