[Stoves] Pasifier Video

Paul S. Anderson psanders at ilstu.edu
Mon Mar 12 21:55:54 CDT 2012


Alex, Ron and all,

Great work, Alex!!!!!!!!!!

The removal of some char and some ash is part of the original Dasifier  
by Agua Das with a small manually operated auger.  Paul Wever and I  
have similar augers in the Chip Energy AVUD gasifiers, both the large  
ones that are automated and in the Biomass Grill (on a red cart, seen  
at   www.chipenergy.com ) that is manually operated.  Maybe turn it a  
few times each 15 to 30 minutes (depends on the fuel and the primary  
air supply.

NOTE to all:  These are __not__ TLUD gasifiers.  As Alex pointed out,  
these have the hot spot at the bottom, and there is not a  
downward-migrating pyrolysis zone that is the key distinction of the  
TLUD units.

The advantages of the auger for removal include.

1.  Clears out part of the bottom of the gasifier so that the created  
char and ash are not blocking the entrance of fresh fuel from above  
AND letting the primary air reach to char without so much ash around it.

2.  Does allow for gathering biochar instead of burning it all to ash.

Alex, I will be going to western Massachusetts for Stove Camp on 6 -  
10 August.  If possible, I would like to drive to your location and  
see your many device(s).  Around 13 Aug.  Are you available then?

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 Alex English <english at kingston.net>:

> Hi Ron,
> see answers below
>
> On 12/03/2012 5:49 PM, rongretlarson at comcast.net wrote:
>> Alex cc List
>>
>>    Nice work (again).
>>
>>    Few questions:
>>
>>  1.  You sent in a "stoves" message on 12 Jan that had some  
>> similarities to, but also major differences from, this given below.  
>>  Can you describe how and why the various differences?
> On February 6 I posted some pictures of the "natural draft  
> Dasifier". This latest post is working with that basic arrangement.
>
> The big difference is that there is a  bed of glowing/gasifying char  
> below the vertical fuel hopper. It supports the fuel and limits its  
> flow down ward. So within limits, the power level is controlled by  
> the primary under grate air, just like most air controlled stoves.  
> This is very effective if the both the ash and the fuel flows  
> freely, as with premium( low ash) wood pellets. If I try to use oat  
> hull pellets which have eight times the ash content and tend to hold  
> their shape as a char-ash, it doesn't let fresh pellets slip down,  
> it won't work. The wood pellets fire in a nozzle at the base of the  
> hopper. I ran it with a 2 inch diameter 4 inch long nozzle for about  
> 80 hours before I had a bridge and flame out. Not good enough. Now  
> it is a 2.5 inch diameter X 4 inch long  nozzle with the bottom inch  
> reduced with a 2 inch insert. No problems since.
>
> With chips, and there are many different qualities and sizes of  
> chips, there is no nozzle. There tends to be some irregularity in  
> chip flow/slippage down the tube. This results in power fluctuations  
> and concurrent changes in combustion quality as gas production and  
> excess air fluctuates. Still quite effective though. There is always  
> more to learn, but especially with the chip.
>
> A second difference is the secondary air inlet. Much more  
> controllable now than with the first outfit.
>>
>>  2.  I can't see a reason for the name "pasifier",  but my google  
>> search engine was sure you had mis-spelled "pacifier". I assume "P"  
>> might stand for "pellet"?  How about the "as"?   Yours seems to  
>> have some similarity to the "dasifier" - is that part of the name  
>> history?
> Passive Gasifier, like passive solar, no pumps or fans, no  
> electricity required.
>>
>>  3.  You also indicated this was working for wood chips - which is  
>> welcome news because of presumed lower costs.  Can you say more on  
>> costs?
> Pellets are now a commodity at 5-7 dollars a bag up here. Chips  can  
> be free to what ever mulch sells for. We buy them by the truck load  
> for 35-55 dollars  per tonne.
>>
>>  4.  Do you have (or could have) any control on output power?  For  
>> how long can the indicated tall supply last - and how much does  
>> power change during this period?
> Yes but there is a minimum where the fire slowly creeps up the  
> nozzle below say 5 KW. At 8 KW it goes for about 2 hours on a  
> "tank". The longest continuous run has been 14 hours.
>>
>>  5.  Any chance that this can be run as a charcoal-maker?  (with  
>> some re-design assumed/allowed).
> Yes, but with augers, it isn't a Pasifier.
>>
>>  6.  You showed 0.1 inch water pressure difference.   At
>>        http://www.gutenberg.org/files/22657/22657-h/chapters/chimneys.html
>> they show .67 inches for 100 ft chimney.     Is yours in the  
>> neighborhood of 14-15 feet?  (This assuming closer to 500 oF, per  
>> their example)
> Close enough. I  have started it with as little as .02 inches of  
> H2O, though slowly. The stack of the wood stove exiting the room is  
> usually in the 300-400F range.
>>
>>  7.  Your previous video concentrated on the flame inside the  
>> (modified) original stove.  Presumably this time no flame to be  
>> seen there?
> Yes it should be completed under the cooking stove top.
>>
>>   8.  We haven't heard anything on your earlier moving grate burner  
>> modifications for the greenhouse.  Have you been getting some char  
>> out?  (presumably chips?)
> We have been working on feed stock quality and have just now  
> received material which should be good. One of several hurdles. Some  
> researchers are keen to do more work with us, so we will make some  
> char over the next couple of weeks.
>>
>> Thanks again for keeping us informed.    Ron
>
> I try,
> Alex
>>
>>
>>
>> ------------------------------------------------------------------------
>> *From: *"Alex English" <english at kingston.net>
>> *To: *"Discussion of biomass cooking stoves"  
>> <stoves at lists.bioenergylists.org>
>> *Sent: *Sunday, March 11, 2012 9:12:01 PM
>> *Subject: *[Stoves] Pasifier Video
>>
>> Dear Stovers,
>> I have been using my  latest version of the gravity powered 'Pasifier'
>> in both wood pellet and chip fired modes for the last month.
>> Still learning but I'm running out of winter and therefore the need.
>> Check it out at;
>> http://www.youtube.com/watch?v=mWP15Eek4Xo&feature=youtu.be
>> <http://www.youtube.com/watch?v=mWP15Eek4Xo&feature=youtu.be>
>>
>> Alex
>>
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>
>



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