[Stoves] Mongolian Model 4, based on the Kyrgyzstan stove, drawings now available

[Crispin Pemberton-Pigott]

Dear Friends

There is a new set of drawings for the Mongolian Model 4, a localised version of the KG4.x stoves that were so successful last winter. The localisation involves:


  *   Shortening of the heat exchanger to meet the local demand caused by very constricted space in side a ger (yurt)
  *   Large cooking hole (36 cm) to accommodate woks up to 62 cm in diameter
  *   Cast iron grate
  *   New heat exchanger layout to bring more heat to the front of the stove, on each side
  *   A down-drafting heat exchanger gas flow that utilises buoyancy to create a thermally stratified profile, hottest at the top and coldest at the bottom
  *   Retains the hot gas ‘bleeder’ incorporated into the Model TJ2, KG2.5 and KG5.2 stoves the latter being a low pressure boiler)
  *   The photos show the top being made of 6mm steel plate but the drawings are provided for a cast iron top which is on it way to production.
  *   The appearance is very conventional on the outside
  *   There is a heating function bypass allowing the stove to be used in summer for cooking while not heating the kitchen much. That is the lever at the back corner.

Things to ignore:
The text of the cutting list is incomplete.
There is only one inner ring, mostly for saving time to make it. A cast iron set is usually 3 parts, not 2.

Linings:
The stove was designed to be assembled using plastic refractory plates 40mm thick, but as we built the prototype lined with refractory bricks, both solutions are included. All the moulds are shown for making the plates including inserts to create bevels. If you have trouble understanding how the inserts work, contact me.

Testing the stove with Kara-Keche coal the firepower peaked at about 20 kW which is well above the designed operating power of 12 kW.

We have multiple reports of people burning corn cobs, wood and a variety of biomass in the stove. I have no advice on how to do that. I tested it with 8mm wood pellets and it has uncontrollably high power. It would need modification in the lower hopper to limit the power to 12 kW.

Coking:
We boiled about 7 litres in water at a rate of 5.5 minutes per litre. That is reasonable for a cooking stove, but very good for a space heating stove. The cooking power is very controllable. In general there is no need to ‘do something’ to the grate or fuel to ramp cooking power up and down. Just slide the air controller.

The estimated selling price is $150.

This combustor, a crossdraft gasifier, makes extremely little smoke. Here is a photo of the top of the stove chimney (at full power) with the Bishkek power station chimney in the background. Both are burning Kara-Keche coal.

[cid:image002.jpg at 01D321A5.E3D76160]

High power pefromance
[cid:image007.jpg at 01D321A5.E3D76160]

The top surface is very hot.
[cid:image008.jpg at 01D321A5.E3D76160]

The stove with the hopper lid off:

[cid:image009.jpg at 01D321A5.E3D76160]

Regards
Crispin


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20170830/c0fc7d0e/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 7752 bytes
Desc: image001.jpg
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20170830/c0fc7d0e/attachment.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image003.jpg
Type: image/jpeg
Size: 11287 bytes
Desc: image003.jpg
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20170830/c0fc7d0e/attachment-0001.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image004.jpg
Type: image/jpeg
Size: 11153 bytes
Desc: image004.jpg
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20170830/c0fc7d0e/attachment-0002.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image005.jpg
Type: image/jpeg
Size: 17253 bytes
Desc: image005.jpg
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20170830/c0fc7d0e/attachment-0003.jpg>