[Stoves] [biochar-production] Continuous TLUD for cooking

[Crispin Pemberton-Pigott]

Dear All

Because of the emphasis on 'cooking stoves' instead of 'stoves' the
possibility for several technologies is not, I feel, being considered if the
goal is to make char.

The BLDD (bottom-lit downdraft) which has been the subject of design many
investigations by people from Peter Verhaart years ago to recent patents
filed by the University of Johannesburg holds promise for very clean burning
and relative simplicity.

The lowest cost is for space heating which is of course not a big topic on a
'cooking stove' forum but in the real world is quite common. Making char
continuously is quite possible and if it is important, one can cook but it
would mean using new developments in heat application. Most downdraft stoves
are used for making process heat or gas, with space heating being a 'process
heat' application.

It is also possible to use a hopper-fed cross draft burner to make char
simply by moving the fuel out of the combustion zone before it finishes
burning.  Alex English has a (very expensive, large) burner that has a dial
on the side which can control exactly the amount produced in this manner. It
burns waste wood from construction and demolition.

As for the cost, with recent improved stove subsidies running in the range
of $5 to as much as $200 perhaps the emphasis on very low cost is not as
relevant as it has been in the past.  The current WB-CSI subsidy for greatly
improved cooking stoves are up to $25 each. That will attract market-ready
products in the $50 range.

Regards
Crispin


2014-01-29, Ronal W. Larson <rongretlarson at comcast.net>:
> Antony  - with eleven ccs
>
> 	1.  First note nice help offered by Alan Cave in several messages
> yesterday.   They did not include your original request below.
>
> 	I agree with his remark that the continuous Belonio stoves that you 
> found at Paul Anderson's sites are down draft (BLDD) - and that may be 
> the best way to go.  At the recent ETHOS conference I do not recall 
> this topic coming up.  (I wrote 3-pager on that conference - available 
> at the stoves site.) The reason is the strong emphasis on stoves that 
> cost $10-$20 - and I doubt we can ever see continuous feed stoves in that
price range.  I talked to Dr.
> Belonio a good bit over the last weekend, but this topic did not come 
> up.  I include Alexis as a cc, as he is probably the best expert on 
> this topic we have.
>
> 	2.   I include the stoves list, because there is apt to be more
expertise
> there on your stove question than on the Biochar-production list.  Tom 
> Miles added because he manages both lists and will have valuable thoughts.
>
> 	3.   I Include Jerry Whitfield, Jock Gill, Alex English, and Marc
Pare as
> they have all written on continuous feed char-makers; but none I think 
> for stoves.  These are probably all horizontal feed (augers, moving
grates,
> etc.).   See http://www.whitfieldbiochar.com   (that is apparently in a
> "hold" mode).  Apologies to anyone I inadvertently left out who has 
> been thinking of continuous-feed stoves.
>
> 	4.  I include Dean Still and Ranyee Chiang as the best way to get 
> this topic into GACC discussions.
>
> 	5.  Can you explain more on why you are interested in this topic for

> stoves?  Do you have an upper price limit or particular stove 
> application in mind?  Would several low cost batch TLUDs operating 
> sequentially in parallel meet your needs?
>
> 	I consider the non-continuous aspect of TLUDs as their biggest 
> drawback - so think we should all take this topic very seriously.  I 
> thank you for bringing it up.  In my mind, the other advantages of 
> TLUDs (primarily time savings and money-making) outweigh this 
> disadvantage.  But it would be very nice to remove this disadvantage 
> whenever an application allows the extra expense that seems sure to
accompany continuous operation.
>
> Ron
>
>
>
>
>
> On Jan 28, 2014, at 4:43 PM, Anthill <ahilliard at gmail.com> wrote:
>
>>
>> Hi biochar-production people. Google has failed me. Do you know if 
>> anyone developed a biochar-generating stove that can run 
>> continuously?  Something
>> that:
>>
>> - Produces water-quenched biochar
>> - Runs continuously on pellets/chips
>> - Unlikely to set fire to feed hopper
>> - Flame can be used for cooking
>>
>> What I'm thinking of is something like:
>>
>> http://imgur.com/a/BGADk
>>
>> Google has showed me:
>>
>> The BEK biochar generator
>> http://bekbiochar.pbworks.com/w/page/6465132/FrontPage
>> - Not for cooking
>>
>> Wallace's biochar generator
>> http://terrapreta.bioenergylists.org/wallaceACpatent
>> - Not woodgas-running
>>
>> Belonio's continuous rice husk generator 
>> http://www.drtlud.com/2012/04/04/rice-husk-gasifier-new-papers/
>> - No quenchable biochar?
>>
>>
>>
>> Any thoughts?
>>
>> -Antony
>>
>>
>>
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--
Nolbert Muhumuza

President & Chief Operations Officer
Awamu Biomass Energy Ltd.
P.O. Box 40127, Nakawa
Kampala - Uganda.

Mobile: +256-776-346724
Skype: nolbertm
www.awamu.ug

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