[Stoves] The TLC burner is new and improved technology inbiomass burner design.

Wed Jul 31 17:30:22 CDT 2013

Dear Lanny

Using a TLUD ignition and following that with a hopper fed burn is one good
way to limit total emissions including the ignition period.

This has relevance to testing of stoves where the ignition period is
included in some test ratings and not in others. As the householder is
exposed to everything from a fire, to me it seems sensible to include
everything as part of the burn cycle.

With an always-on device like a hot water boiler in a heating system there
are arguably good reasons not to include the ignition period but (rather
obviously) that is not part of normal operation.

For an actual reduction in the exposure of cooks to smoke, the ignition
period is a good target. Using a top-lit fire, like a good Boy Scout always
does, is an easy way to reduce the overall total PM mass emitted.

Incidentally there were 13 stoves tested for the Ulaanbaatar Clean Air
Project (UB-CAP). There were 4 stoves selected for the second round of more
intensive testing. All the selected stoves were ND-TLUD's. None are fan
stoves. All achieved >90% reduction in emissions based on the old baseline.
The reason I say 'old baseline' is that there has been a government mandated
change in the fuel available in the city (from one coal source to another)
and the new source is significantly different in composition. This resulted
in a large increase in the baseline emissions, meaning the baseline stove
produce much more smoke than it used to with the old fuel. In spite of this
fuel change, the new stoves were held to the old emission baseline and were
still able to dramatically reduce total PM and CO.

Now that 100,000 stoves have been changed there are about 60,000 left. Some
45,000 will be change by the end of the year - at least that is the target.

Depending on the quality of combustion, a coal fire can significantly affect
the taste of food. With the newest stoves this is pretty good, though there
is much to be learned about how to ignite a stove for minimum smoke. My
feeling is that we can do better. Some stoves are still achieving 99.5%
reductions even with the new fuel so 'much better' is not unrealistic.

Regards

Crispin

From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
Lanny Henson
Sent: Wednesday, July 31, 2013 5:43 PM
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] The TLC burner is new and improved technology
inbiomass burner design.

Crispin,

If the wood is high quality like well seasoned oak the water I am boiling
does not take on a nasty flavor. But of course high quality wood will be
rare so a lid may be necessary.

I have worked with hopper fed designs mostly charcoal cookers. I have one
that will hold steady temps for 48 hours without refueling. You do have to
pull the ashes every 12 hours though using briquettes. 

Me and my senior cooking partner cooked 2000 LB of pork for Habitat for
Humanity an org that builds houses for the poor* with 4 cookers that I
designed in two cooking sessions. We have another cook for the Knights of
Columbus a Catholic org, this Labor day. I do two charity events a year.

*The poor in the USA should be called the "Impovrich". Hopefully soon I will
be able to help the "real poor" to which I have more sympathy.

Lanny

----- Original Message ----- 

From: Crispin Pemberton-Pigott <mailto:crispinpigott at gmail.com>  

To: 'Discussion of biomass cooking stoves'
<mailto:stoves at lists.bioenergylists.org>  

Sent: Wednesday, July 31, 2013 4:59 PM

Subject: Re: [Stoves] The TLC burner is new and improved technology
inbiomass burner design.

Dear Lanny

Thanks for the interesting review. I think it will be of interest to the
viewers to know that a pot heated all around will probably have to have a
lid on it to prevent the food absorbing smells from the combustion. This is
so important in certain regions that users can be observed waiting until 'a
certain point' during the ignition of a stove before putting on the pot to
avoid any contamination.

There are cases where the smoke is desirable but that is more unusual. 

So there is no big issue for the cooker, it is just that the lid will
probably have to be on when cooking and the flat lid-thing will have to
clear the handle.

I like the side loading. It is one approach to refuelling TLUDS's (top-lit
updraft-started stoves). There is a variation on the theme in Mongolia which
is a TLUD with hopper fed continuation, and it generates >50 Watts of
electricity too.

Regards

Crispin

The TLC burner ("Top Lit Combustor") is new technology.  I believe it is
step forward toward improved biomass cooking stove design.

The TLC is a batch-fueled burner to which you can add fuel without creating
smoke to boost the heat and extend the cooking time.

This video demonstrates the "Top Lit Combustor" and the 'School Lunch
Cooker's" amazing capability to burn damp and wet wood outdoor in the rain.
Even adding a chunk wet concrete block does not stop this burner.

The "School Lunch Cooker" uses the "TLC burner",  and my  "Exhausted Pot
Shell"  to cook outdoor in all weather. 

This stove just wants to cook!

http://www.youtube.com/watch?v=uP2FVCeR8QQ

Lanny Henson

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