[Stoves] Understanding TLUDs, MPF and more. (was Re: Bangladesh TLUD )

[Frank Shields]

Andrew,

A pipe filled with sand, purged with N2 and temperature probe placed 
inside  and placed in a furnace,- the temperature should lag behind the 
oven temperature as the heat slowly goes into the pipe. The temperature 
of biomass inside the pipe should also lag behind  unless heat is 
produced inside from the biomass. I will not be permitted to drill two 
holes through the furnace wall to test this out. But I think the 
experiment would show if Oxygen in the biomass structure already reacted 
with surrounded C and H would free up and increase heat as a secondary 
'structure shift'(?) occurs.


When charring biomass at increasing temperatures (450c to 900c in 50deg 
increments) it needs to be done very slowly or fire happens and a 
run-a-way temperature ruining the experiment. The char produced is used 
to plot Activity to find the optimum temperature for highest activity 
char. This heated slowly to allow the gases to escape and dilute below 
concentrations supporting combustion.

I don't have equipment for gas analysis. The lab I now work in is very 
small using cheap equipment. It can do all I would want for biomass 
testing (Box-1) and a lab like it could be set up anywhere.

Regards


Frank



On 12/14/17 8:28 AM, Andrew Heggie wrote:
>
>
> On 13 December 2017 at 05:43, Frank Shields <franke at cruzio.com 
> <mailto:franke at cruzio.com>> wrote:
>
>     This is an interesting topic and one i have wondered about. When
>     packing hard a pipe with biomass then flushing with N2 then
>     placing in an oven to heat from the outside to a temperature to
>     550c a lot of gases come out the small hole at the end.  That will
>     ignite if the door is opened and O2 contact. I have wondered if
>     any heat is being produced in the pipe itself? or all from
>     external heat? If there is it can't be much because the
>     temperature advances at a continuous rate. Should you see the
>     temperature jump well above 550c its because air leaked in to the
>     furnace and there is a flame.
>
>
> Frank it is interesting  what you seem to be showing when opening the 
> door is that the pyrolysis offgas coming out of the hole is above its 
> auotignition point.  What would be relevant to the current discussion is :
> 1 the temperature variation inside the tube
>
> 2 the varying analysis of the composition of offgas as the tube heats up.
>
> Andrew
>
>
> _______________________________________________
> Stoves mailing list
>
> to Send a Message to the list, use the email address
> stoves at lists.bioenergylists.org
>
> to UNSUBSCRIBE or Change your List Settings use the web page
> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org
>
> for more Biomass Cooking Stoves,  News and Information see our web site:
> http://stoves.bioenergylists.org/
>

-- 
Frank Shields
444 Main Street Apt. 4205
Watsonville, CA  95076

(831) 246-0417 cell
franke at cruzio.com

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20171214/fa4c63c5/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: franke.vcf
Type: text/x-vcard
Size: 264 bytes
Desc: not available
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20171214/fa4c63c5/attachment.vcf>