[Stoves] Biomass Stove from Indonesia -- TLUD data -- and stick-wood fuel

Wed Apr 4 10:39:01 CDT 2012

Dear Prof. Nurhuda and all,

Thank you for your informative response.  You are one of the leaders  
in TLUD work worldwide.

With my Webmaster James Schoner (JSS), we will soon have your data and  
info posted to the newly revised    www.drtlud.com   website.

Your work reveals several important things:

1.  Use of segments of stick-wood (could be called "wood segment  
fuel") for TLUDs.

2.  Length of time of burning:  for each batch of fuel, over 1 hour to  
over 2 hours in the larger units.

The above 2 are "answers" to frequently asked questions.  Next is a  
continuing "issue".

3.  Life-span of the UB-03 stove is 6 to 12 months, but we want it to  
last longer.  So I discuss this below and request that Prof Nurhuda  
reply to confirm or correct my statements:

A.  The first part to fail is at the bottom grate or bottom of the  
inner (fuel holding) cylinder.  That is mainly because of the high  
heat of burning charcoal.  We agree that the char should be dumped out  
  (not burned inside of a TLuD).

B.  Does the UB-03 model allow for repairs of that piece, or is the  
entire stove basically lost?  Replacement parts extend stove life if  
available and affordable and easily installed.

C.  Use of different metals for the parts with the shortest lifespan.   
Is there any Indonesian experience with that?

In future messages we can discuss additional aspects of TLUDs.

Paul
-- 
Paul S. Anderson, PhD
Known to some as:    Dr TLUD      Doc      Professor
Phone (USA): 309-452-7072   SKYPE: paultlud   Email: psanders at ilstu.edu
www.gtz.de/de/dokumente/giz2011-en-micro-gasification.pdf (excellent ref.)
My website specific for TLUD information: www.drtlud.com  =  www.DrTLUD.com

Quoting mnurhuda at ub.ac.id:

> Dear Proff. Anderson,
>
> Thank you very much for your nice response.
>
> As you might know, the main challenge in implementation the stove is the
> stove material. In this time, the stove is made from 'reject plate
> material', commonly used for kerosene stove, but the thickness of plate is
> a bit larger. Otherwise, it is almost impossible to sell the stove below
> US$ 10,-/each. Most of our targeted users in Indonesia can not pay for
> stove price higher than US$ 10,-
>
> Consequently, users must take care when operate the stove, they have to
> avoid over-heating, i.e. when wood changes to charcoal. They have also to
> avoid contact between water and the stove. When the stove is used
> according the manual procedures, it can last up to one year or even more,
> otherwise, it depends on how the users handle the stoves,  sometime the
> stove can last more than 6 months, sometime less.
>
> About the fuel. We currently use stick wood/twigs with length 17 cm for
> our household stove type, and 30 cm restaurant (jumbo) type stove. Small
> pieces are placed on the top only to  facilitate the initial combustion.
> When fuel is compactly arranged in the burning tube, we will see no smoke.
> With about 1 kg fuels, house hold type can deliver flame up to 1.5 hours.
> The jumbo type, on the other hand, with 3 kg fuels, can burn up to 2.5
> hours (for flame) and additional 1.5 hour for charcoal. The power of jumbo
> type is clearly higher than the house hold type. To boil 15 L water needs
> 40 minutes.
>
> We currently have sold the UB-03 type, more than 6000 units. Totally with
> UB-02, probably it counts more than 8500. User are usually satisfied with
> our stoves, after they know the correct procedures in using the stove.
> Beginner users usually make mistakes in using the stove and we provide the
> free-consultation for it.
> The most complaint usually deals with the life time of the stoves.
> Subsidiaries are therefore very important in order we can improve the
> stove quality. Are there international funding?
>
>
> Best regards
> M. Nurhuda
>
>
>> To all Stovers,
>>
>> BRAVO to Professor Muhammad Nurhuda and his co-workers in Indonesia!!!
>>
>> This is serious TLUD R&D, with practical results!!!!
>>
>> The use of stick-wood segments (30 cm in this case) is highly
>> important.  Christa Roth and I and others have seen such fuels also
>> used successfully in Africa (especially CREEC in Uganda).  Nurhuda's
>> YouTube items illustrate very well the vertical placement of
>> serious-sized stick-wood with smaller pieces entering last,to fill
>> most of the vertical voids, plus small pieces on the top for ignition
>> (and I suspect also for appropriate additional limiting of the
>> vertical air flow).  This deserves further serious study.
>>
>> If stick-wood segments are a preferred fuel source and are available,
>> they will give a major boost to spreading TLUD cookstoves worldwide.
>>
>> I and hopefully others will assist Nurhuda bring his excellent work to
>> the attention of the English speaking stovers.
>>
>> M.N, please tell us how many of your TLUD stoves you have now
>> produced, and at what price.  At ETHOS 2010 I reported about your
>> stoves and noted "2500 units of model UB-02 have been produced and
>> sold at $10."  So that was probably 2009 data that you sent me.
>>
>> We are delighted to have such a significant update about your work in
>> Indonesia!!
>>
>> Paul
>> --
>> Paul S. Anderson, PhD
>> Known to some as:    Dr TLUD      Doc      Professor
>> Phone (USA): 309-452-7072   SKYPE: paultlud   Email: psanders at ilstu.edu
>> www.gtz.de/de/dokumente/giz2011-en-micro-gasification.pdf (excellent ref.)
>> My website specific for TLUD information: www.drtlud.com  =
>> www.DrTLUD.com
>>
>>
>> Quoting mnurhuda at ub.ac.id:
>>
>>> All,
>>>
>>> Muhammad Nurhuda has provided links to an interesting series of TLUD
>>> cooking
>>> stoves made by Kompor Biomass in Indonesia.  The videos show how large
>>> pieces can be burned in TLUD designs.
>>>
>>> Tom Miles
>>> -------------------------------------------------------------------
>>>
>>> Let me first introduce myself. My name is Muhammad Nurhuda, I am
>>> researcher and teaching staff at Physics Department, Brawijaya
>>> University,
>>> Malang, Indonesia.
>>>
>>> We have developed various biomass stoves. The fuels also vary from
>>> chopped
>>> woods/twigs, pellet, palm kernel shell,  hazelnut kernel shell,
>>> corncob,
>>> etc..
>>>
>>> You might see the videos of our stoves in the following  youtube's
>>> addresses:
>>>
>>> http://www.youtube.com/watch?v=sty_pdFYr44
>>>
>>> http://www.youtube.com/watch?v=B4r5U18s_OY
>>>
>>> http://www.youtube.com/watch?v=g7TZn6YGOcI
>>>
>>> http://www.youtube.com/watch?v=KOba6FobfrQ
>>>
>>> http://www.youtube.com/watch?v=b70z9-0nK6E
>>>
>>> All stoves presented above are of TLDU types, but the combustion is
>>> improved by using pre-heating and counter-flow burning mechanism. The
>>> one
>>> intended for palm kernel shell utilizes diffused-combustion mechanism,
>>> in
>>> addition to pre-heating and counter flow mechanism.
>>>
>>> The latest one
>>>
>>> http://www.youtube.com/watch?v=b70z9-0nK6E
>>>
>>> is devoted for institutional cook stove or small restaurants.
>>>
>>> Very recently, we have also developed a new rocket stove. The combustion
>>> in this new rocket stove is improved by introducing counter-flow burning
>>> mechanism. Please check the video in the following address:
>>>
>>> http://www.youtube.com/watch?v=kID0YL6TyqA
>>>
>>> I have been invited by Prof Anderson to join this discussion group, a
>>> year
>>> ago. Due to my bad English, I am not very confident to write an article
>>> in
>>> discussion group. However, I always check if there is a new one.
>>>
>>> With best regards
>>> M. Nurhuda
>>> Malang, Indonesia
>>> mnurhuda at ub.ac.id
>>>
>>>
>>>
>>>
>>>
>>>
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>>>
>>>
>>
>>
>>
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