[Stoves] Why is it still so difficult to design cookstoves for 3 billion people?

Max Turunen maxturunen at gmail.com
Mon Jun 20 05:35:05 CDT 2016


Also, unfortunately, in some cases because stove development projects can
get grant money. Ready stove design means end of money for "project
coordinator".
On Jun 20, 2016 03:15, "Anand Karve" <adkarve at gmail.com> wrote:

> Dear Crispin,
> Bottom-lit updraft is a nice way of producing wood gas. The fire at the
> bottom gasifies the biomass piled above the burning biomass. But this gas
> can catch fire as it comes out of the gasifier. I still remember my first
> attempts about 15 years ago, when I got such a tall flame that it burned
> the  wiring of the electric lighting fixture on the ceiling. Can you
> provide me with the E-mail address of  Hirendra Chakrabarti?
> Yours
> A.D.Karve
>
> ***
> Dr. A.D. Karve
>
> Chairman, Samuchit Enviro Tech Pvt Ltd (www.samuchit.com)
>
> Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
>
> On Sun, Jun 19, 2016 at 12:47 PM, Crispin Pemberton-Pigott <
> crispinpigott at outlook.com> wrote:
>
>> Dear Todd
>>
>>
>>
>> That was informative. Thanks.
>>
>>
>>
>> I would like to bring to everyone’s attention a type of gasifier that is
>> bottom-lit, updraft, that is used to make a high energy wet gas. CAU grad
>> student Riaz Ahmad has been working on one and has been able to produce a
>> gas capable of working in a standard gas burner. He is using forced draft
>> both to run the gasifier and to produce a pre-mixed gas. The major
>> advantage of such a layout is that it can be continuously or episodically
>> refuelled indefinitely. This type of gasifier is made by Hirendra
>> Chakrabarti in India (and his company).
>>
>>
>>
>> As the fuel is pyrolysed, the ash (or char) can be removed from the
>> bottom while the hot zone is moving upwards. As the hot zone rises above
>> the middle of the vertical height, the ash (or char) an be removed from the
>> bottom and additional fuel added through an airlock at the top.
>>
>>
>>
>> Riaz has been creating usable gas from a variety of materials including
>> large pellets (small briquettes) made from agricultural waste.
>>
>>
>>
>> The advantages of being able to refuel the stove while it is running are
>> obvious.
>>
>>
>>
>> Regards
>>
>> Crispin
>>
>>
>>
>>
>>
>> *TLUDs were developed in China*.  Note intense tall flame, the Chinese
>> developed this advanced secondary combustion over primary combustion
>> technology specifically for wok cooking, their preferred cooking
>> methodology.  In fact more TLUDs are produced in China than anywhere else
>> in the World.  Natural draft TLUD's have been utilized in China for over a
>> century from what we can determine.  Unfortunately no documentation
>> exists.  The stoves are found in old homes throughout China that have
>> fallen down decades ago.
>>
>>
>>
>> If you explore ancient Chinese homes, you'll find natural draft wood
>> burning TLUD configurations in numerous homes.  The top burning
>> gasification was referred to as 2nd wind.  This additional firepower is
>> highly desired and intended to maximize temperatures required for wok
>> cooking.  While great discussions have been going on regarding turn down
>> power designs as a relatively new innovation, it is not.
>>
>>
>>
>> We have been selling both a natural draft TLUD with primary air dampner
>> for 4 years now, and a forced air fan stove with a pulse width modulator
>> (interrupts electrical signal to create fan speed to regulate firepower)
>> since 2012, in addition to rocket stoves.  The TLUDs cook faster and hotter
>> than the rocket stove, but actually complement each other for different
>> styles of cooking.
>>
>>
>>
>> Although a TLUD can easily return to high firepower with the addition of
>> new fuel, there is also a cadence to cooking with a TLUD that occurs over
>> time.  The turn down control when cooking with a TLUD is a natural process
>> over time, with or without a mechanical damper.  That seems to be a nuance
>> missed by many.
>>
>>
>>
>> Regards,
>>
>>
>>
>> Todd Albi, SilverFire
>>
>> www.silverfire.us
>>
>>
>>
>>
>>
>> On Thu, Jun 16, 2016 at 10:47 PM, Mangolazi <mangolazi at yahoo.com> wrote:
>>
>> How about China? There are hundreds of millions of farmers and rural
>> dwellers there, most of them still using firewood or biomass for cooking
>> and heating. LPG is used mainly in urban areas and it's mainly piped gas,
>> not canisters.
>>
>> I've yet to see any TLUD stoves during my travels there, despite most of
>> the EBay woodgas stoves being made there. Most farm houses use simple
>> chimney stoves or 3-stone fires. I've seen nomadic herders up in the
>> Tibetan plateau using cast iron chimney stoves but even those were smoky,
>> filling up tents with choking soot. TLUDs running on wood and dung could
>> provide interior and cooking heat with much lower emissions, provided they
>> can work at high above 4000 m.
>>
>> Anyway, just my 2c...
>>
>>
>>
>>
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>
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