[Stoves] Crispin´s kiln -- Bourry Birebox gasifier heater

[Tom Miles]

Peter,

So you can have any kind of a reactor you want as long as it has an arc? :-)

I found a modification of the Bourry design that looks like it might have a
more uniform gas pattern. The concept is adaptable to stickwood or sawdust
like designs. 

Ken Goyer shows a variety of traditional wood kilns that can be improved on.
http://www.bioenergylists.org/en/kilnsandbrick

I wonder how the Bourry compares in performance to the stickwood and sawdust
fired kilns of the kind that Manny Hernandez has been building. 
http://www.bioenergylists.org/en/kilnbuilding
http://www.bioenergylists.org/en/hernandezkilnethos


Tom




> -----Original Message-----
> From: stoves-bounces at listserv.repp.org [mailto:stoves-
> bounces at listserv.repp.org] On Behalf Of Peter Singfield
> Sent: Friday, July 06, 2007 8:04 AM
> To: stoves at listserv.repp.org
> Subject: Re: [Stoves] Crispin´s kiln -- Bourry Birebox gasifier heater
> 
> At 08:38 PM 7/5/2007 -0700, Tom Miles wrote:
> >Peter,
> >
> >That's a fun design. It's really more of a downdraft staged combustor.
> I've
> >worked with Russian and Japanese designs which burn chips that are
> very
> >similar. They can make a lot of removable char. I doubt that it could
> >maintain the 1100-1300C temperature required. I noted the comment
> about the
> >4 cone difference in temperature along the back will for the 100 ft3
> kiln.
> >Crispin's requirement is for high temperature and uniform temperature
> >control.
> >
> >Kiln builders like Joe Finch
> >(http://www.amazon.com/Kiln-Construction-Brick-Approach/dp/0812219848
> )
> >suggest that a kiln built to fire up 1150 C is a lot different than
> one
> >designed for 1300C. (In "pros and cons" he lists an advantage for wood
> >firing as: "Wood firing can satisfy one's pyromaniac tendencies!")
> >
> >Tom
> >
> 
> 
> I Believe he requires a cone 10 -- 1305C / 2381F
> 
> That is right up there with smelting cast iron.
> 
> I foundry -- one can do this with electric -- coke -- or diesel/oil as
> fuel.
> 
> Charcoal barely can do it. Sponge iron -- etc.
> 
> What is cute about this gasifier is:
> 
> 1: not much fuel sizing required
> 
> 2: Of brick construction
> 
> 3: It is a dual cycle device -- with three air feeds.
> 
> a: Top down burning
> 
> b: combustion of product gas
> 
> c: up draft charcoal burner.
> 
> Electric heating would be the best for Crispin -- but here is a
> possible
> avenue of experimentation.
> 
> Using a suitably sized bourry firebox --
> 
> Still top load and burn off those product gasses to "preheat" kiln and
> supply a reducing atmosphere.
> 
> But redirect the product gas from the char pit to a dual fueled diesel
> for
> electric power to operate the resistance heaters.
> 
> The kiln could be regulated by using an induced draft fan --
> 
> So as heat got up -- more product gas could be redirected to engine
> power
> plant. (And just in time to!!)
> 
> The electric load required should be greatly reduced than as well --
> being
> at the producer gas alone should heat to at least 1500 F
> 
> And -- this would also work well for an iron foundry/smelting set up --
> where producer gas was traditionally use for preheating charge.
> 
> But instead of resistance heating -- use an arc.
> 
> Then yes -- a truly biomass fired kiln of foundry with exceptional high
> temperature operation can be achieved.
> 
> Further -- "arc" heating might be considered for kiln as well as
> smelting??
> Being as resistance heaters that can do 1305 C are something quite
> exotic --
> 
> While graphite rods one can roll their own.
> 
> Soderberg electrode paste composition
> 
> http://www.freepatentsonline.com/4897170.html
> 
> Peter/Belize
> 
> 
> 
> **********appended****************
> 
> Just the higher "cones"
> 
> The entire chart is found at:
> 
>  http://www.ceramicstoday.com/cones.htm
> 
> Cone #   C      F
> 1       1154   2109 Yellow
> 2       1162   2124
> 3       1168   2134
> 4       1186   2167
> 5       1196   2185
> 6       1222   2232
> 7       1240   2264
> 8       1263   2305
> 9       1280   2336
> 10      1305   2381 White
> 11      1315   2399
> 12      1326   2419
> 13      1346   2455
> 
> 
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