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Hi Ron,<br>
see answers below<br>
<br>
On 12/03/2012 5:49 PM, <a class="moz-txt-link-abbreviated" href="mailto:rongretlarson@comcast.net">rongretlarson@comcast.net</a> wrote:
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<div style="font-family: Arial; font-size: 12pt; color: rgb(0,
0, 0);">Alex cc List<br>
<br>
Nice work (again).<br>
<br>
Few questions:<br>
<br>
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?<br>
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On February 6 I posted some pictures of the "natural draft
Dasifier". This latest post is working with that basic arrangement.
<br>
<br>
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.<br>
<br>
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.<br>
<br>
A second difference is the secondary air inlet. Much more
controllable now than with the first outfit.<br>
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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?<br>
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Passive Gasifier, like passive solar, no pumps or fans, no
electricity required.<br>
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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?<br>
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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.<br>
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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?<br>
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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.<br>
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5. Any chance that this can be run as a charcoal-maker?
(with some re-design assumed/allowed).<br>
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Yes, but with augers, it isn't a Pasifier.<br>
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6. You showed 0.1 inch water pressure difference. At <br>
<a class="moz-txt-link-freetext" href="http://www.gutenberg.org/files/22657/22657-h/chapters/chimneys.html">http://www.gutenberg.org/files/22657/22657-h/chapters/chimneys.html</a><br>
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)<br>
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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.<br>
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7. Your previous video concentrated on the flame inside the
(modified) original stove. Presumably this time no flame to
be seen there?<br>
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Yes it should be completed under the cooking stove top.<br>
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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?)<br>
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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. <br>
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Thanks again for keeping us informed. Ron<br>
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<br>
I try,<br>
Alex<br>
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<br>
<hr id="zwchr"><b>From: </b>"Alex English"
<a class="moz-txt-link-rfc2396E" href="mailto:english@kingston.net"><english@kingston.net></a><br>
<b>To: </b>"Discussion of biomass cooking stoves"
<a class="moz-txt-link-rfc2396E" href="mailto:stoves@lists.bioenergylists.org"><stoves@lists.bioenergylists.org></a><br>
<b>Sent: </b>Sunday, March 11, 2012 9:12:01 PM<br>
<b>Subject: </b>[Stoves] Pasifier Video<br>
<br>
Dear Stovers,<br>
I have been using my latest version of the gravity powered
'Pasifier' <br>
in both wood pellet and chip fired modes for the last month.<br>
Still learning but I'm running out of winter and therefore the
need. <br>
Check it out at;<br>
<a class="moz-txt-link-freetext" href="http://www.youtube.com/watch?v=mWP15Eek4Xo&feature=youtu.be">http://www.youtube.com/watch?v=mWP15Eek4Xo&feature=youtu.be</a>
<br>
<a class="moz-txt-link-rfc2396E" href="http://www.youtube.com/watch?v=mWP15Eek4Xo&feature=youtu.be"><http://www.youtube.com/watch?v=mWP15Eek4Xo&feature=youtu.be></a><br>
<br>
Alex<br>
<br>
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