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

[Ulan CAMP]

Dear Crispin,

 

This week we have tested Mongolian Model 4 with new bridge, based on your
original drawings. Also we added 3 lines of brick around hoper inside of the
stove in order to prevent coal from roasting. Those minor improvements made
a positive changes on stove operating. 

There is a report attached with our observations and measurements.   

 

best regards, 

 

Ulan    

 

 

From: Crispin Pemberton-Pigott [mailto:crispinpigott at outlook.com] 
Sent: Wednesday, August 30, 2017 3:43 PM
To: 'Stoves (stoves at lists.bioenergylists.org)'
<stoves at lists.bioenergylists.org>
Subject: Mongolian Model 4, based on the Kyrgyzstan stove, drawings now
available

 

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.

 



 

High power pefromance



 

The top surface is very hot.



 

The stove with the hopper lid off:

 



 

Regards

Crispin

 

 

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