[Stoves] the 150 gasifier in operation in Vietnam

Sat Mar 3 00:25:15 CST 2012

Ron,

See comments.

On Sat, Mar 3, 2012 at 11:04 AM, Ron Larson <rongretlarson at comcast.net>wrote:

> Paul and lists
>
>   Congratulations on the new design with a mesh.  I think you have
> achieved the nicest looking flame yet of any stove ever described on this
> list.
>

On February 22, 2012 I did three boiling tests.

The first test was carried out on a normal propane gas burner that I have
in my kitchen. <#135d72f7bad81d52__ftn1>
 <http://youtu.be/w8OdW_GEhWo>

http://youtu.be/w8OdW_GEhWo

Here it took 6 minutes and 6 seconds to bring one liter of water to a boil.

The burner shown in this video is a very efficient premix gas burner.

But since it operates solely by means of convection, its performance is not
optimal.

 The second test was carried out using the 150 gasifier:
 <#135d72f7bad81d52__ftn2>

<#135d72f7bad81d52__ftn2> http://youtu.be/jK3UTe1Lxqk

Here it took 3 minutes and 42 seconds to bring one liter of water to a
boil.

Note that the same pan without a lid was used in these two boiling tests.

Here heat is transferred by both convection and thermal radiation.

The third test was carried out using an insulated electric water kettle, as
shown here:

http://dl.dropbox.com/u/22013094/150%20Gasifier/Boiling/IMG_1042.JPG

Here it took 3 minutes and 25 seconds to bring one liter of water to a
boil.

In this way I was able to compare the two previous results

with what could be considered to be the fastest way to boil water in a
kitchen setting.

  I wonder if you have found any technical design literature for this added
radiative mesh?  (Materials, wire diameters and spacing, etc?)

I have no theoretical understanding with regard to what is happening with
the wire mesh dome.
I tried flat wire mesh, and this did not work at all.
The wire mesh has to be in the form of a dome to accommodate the small
diffusion tail that you see here:
http://youtu.be/WXZvvoxCm1g

I tried wire meshes of various apertures.
If the aperture of the wire mesh is too big, the flames are not contained
properly under the dome.
If the burning of gases takes place above the dome, the dome does not turn
red hot.
This week I will experiment with much finer wires and apertures.

Also, if I turn down the primary air to a point where much less gas is
produced,
 combustion no longer takes place at the burner holes but within the apex
of the dome.
Here a most unusual but stable cloud of burning gases is formed.

The wire mesh dome quite nicely protects the gas being combusted from
disturbance by the wind.
Previously when the wind would hit the burner without the wire mesh dome,
it would move the flames in all directions.
Often it left in its wake a lot of unburned gases.

I think that thermal radiation travels down to the burner and keeps it
hotter than before.
I suppose that as hot gases hug the underside of the red hot dome,
 gas temperature prior to combustion is higher than before.

The wire mesh dome not only emits thermal radiation,

but it also traps fine cinders that are emitted by the burner.

It will take many more months of experimenting and testing to understand  a
bit better what is happening here.

Thanks.
Paul Olivier

>   To list readers, I strongly recommend the report given below, as well as
> the videos.  There are some impressive Biochar field results as well as
> stove results.  For this reason, I am also forwarding this to the (general)
> Biochar list.
>
> Ron
>
>
>
> On Mar 2, 2012, at 4:11 PM, Paul Olivier <paul.olivier at esrla.com> wrote:
>
> This is a TLUD forced air gasifier in operation on rice hulls.
>
> Here you see the burner with burner housing:
>  <http://www.youtube.com/watch?v=nZDt8DfgSls&feature=channel>
> http://www.youtube.com/watch?v=nZDt8DfgSls&feature=channel
>  <http://youtu.be/WXZvvoxCm1g>http://youtu.be/WXZvvoxCm1g
>
> When a wire mesh dome is placed on top of the burner and burner housing,
>  this roughly doubles the amount of heat being transferred to a pot:
>  <http://youtu.be/7fnGem9BQ7Q>http://youtu.be/7fnGem9BQ7Q
>  <http://youtu.be/yO3jcbQj-GI>http://youtu.be/yO3jcbQj-GI
>  <http://youtu.be/2c6A6BVitpE>http://youtu.be/2c6A6BVitpE
>
> Here it took 3 minutes and 42 seconds to bring a liter of water to a boil:
>  <http://youtu.be/jK3UTe1Lxqk>http://youtu.be/jK3UTe1Lxqk
>  <http://youtu.be/80REBVTwpMo>http://youtu.be/80REBVTwpMo
>
> For more details on this gasifier, see:
>  <http://esrla.com/pdf/landfill_06.pdf>
> http://esrla.com/pdf/landfill_06.pdf
>
> Thanks.
> Paul
>
> --
> Paul A. Olivier PhD
> 27C Pham Hong Thai Street
> Dalat
> Vietnam
>
> Louisiana telephone: 1-337-447-4124 (rings Vietnam)
> Mobile: 090-694-1573 (in Vietnam)
> Skype address: Xpolivier
> <http://www.esrla.com/>http://www.esrla.com/
>
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-- 
Paul A. Olivier PhD
27C Pham Hong Thai Street
Dalat
Vietnam

Louisiana telephone: 1-337-447-4124 (rings Vietnam)
Mobile: 090-694-1573 (in Vietnam)
Skype address: Xpolivier
http://www.esrla.com/
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