[Stoves] More about concentrators.

[Julien Winter]

Hi Norm;

The nozzle discussed above would replace a concentrator ring in a ND-TLUD
cookstove, or go at the bottom of an internal riser burner.

For a 55 gallon TLUD, a nozzle can be adapted from black stove pipe
expanding/reducing connectors.  There is a picture of one (attached) that I
built in 2013, following the advice of David Yarrow.  It is a 35 gallon
drum inside of a 55 gallon drum.  David suggested cutting diagonal slits in
the side of the expanding connector to create a tertiary air entry point.
Later, I attached three cable guy-wires, with turn-buckles, to stabilize
the stack.   I don't have it any more.  I gave it away to a friend.

For these nozzles, I assume that there is a large degree of mixing of
secondary air and pyrolytic gases before they enter the nozzle.

Cheers,
Julien.

On Thu, Mar 28, 2019 at 12:53 PM Norman Baker <ntbakerphd at gmail.com> wrote:

> Julien;
>
> I'm not sure I entirely understand where you put the nozzle? Where would
> you suggest in my 55 gal. TLUD?
>
> Norm
>
> On Thu, Mar 28, 2019 at 6:58 AM Anderson, Paul <psanders at ilstu.edu> wrote:
>
>> Julien,    (and to the Stoves Listserv, and for posting at my website
>> www.drtlud.com/eposts   )
>>
>>
>>
>> Interesting.
>>
>> Are the nozzles with slanted walls (like in a funnel) or with straight
>> sides?    What diameters at each end for what sized of TLUD gasifiers?
>>
>>
>>
>> Paul
>>
>>
>>
>> Doc / Dr TLUD / Paul S. Anderson, PhD
>>
>> Exec. Dir. of Juntos Energy Solutions NFP
>>
>> Email:  psanders at ilstu.edu       Skype:   paultlud
>>
>> Phone:  Office: 309-452-7072    Mobile: 309-531-4434
>>
>> Website:   www.drtlud.com
>>
>>
>>
>> *From:* Julien Winter <winter.julien at gmail.com>
>> *Sent:* Thursday, March 28, 2019 8:31 AM
>> *To:* Norman Baker <ntbakerphd at gmail.com>
>>
>> Hi Norm;
>>
>>
>>
>> Instead of a concentrator ring, try a nozzle.    A nozzle brings the
>> burning gases together without the shape edges of a concentrator ring.
>>  The sharp edges could generate soot.  A nozzle has smooth edges.   TLUD
>> nozzles are being manufactured, but they are being misused!!   People are
>> turning them upside down and using them to load mason jars with food.   So,
>> you can find TLUD nozzels on the shelves for food canning supplies in
>> hardware stores.
>>
>>
>>
>> The reason why I got into the stove burner design business about five
>> years ago was because when I used concentrator rings, I got deposits on the
>> bottom of pots.
>>
>>
>>
>> Cheers,
>>
>> Julien.
>>
>>
>>
>>
>>
>>
>>
>> On Thu, Mar 28, 2019 at 1:47 AM Norman Baker <ntbakerphd at gmail.com>
>> wrote:
>>
>> Paul;
>>
>> I assume you mean the diameter of the stack or combustor? In prior tests
>> with concentrator rings, a whole that has a diameter of 70% of the stack
>> seem to be adequate. Lately, I have been going to about an 80%
>> diameter.  In one publication I read the stack diameter should be at least
>> 60% of the feedstock barrel diameter. Otherwise the time needed for gases
>> to exit the combustor became too fast and hence too short for complete
>> combustion. Is this your experience? And how about the rest of you chiming
>> in on this.
>>
>>
>>
>> Norm
>>
>>
>>
>> On Wed, Mar 27, 2019 at 8:05 PM Anderson, Paul <psanders at ilstu.edu>
>> wrote:
>>
>> Norm,
>>
>>
>>
>> In general, the diameter of the hole is about half of the diameter.   But
>> there might not be any visible (noticeable) impact if reduced or enlarge 10
>> to 20% of the size of the  hole.  Trial and error are your best bets to get
>> this refined.
>>
>>
>>
>> I look forward to hearing of your results.
>>
>>
>>
>> Paul
>>
>>
>>
>>
>>
>

-- 
Julien Winter
Cobourg, ON, CANADA
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