[Stoves] Stove tipping: Stoves Digest, Vol 37, Issue 28

[Nathan Johnson]

Hi Lanny,

Fuel can increase the ease of stove tipping if the fuel exerts a downward force near the outside of the stove (e.g., wood placed in horizontally that "hangs" out the side of the stove, or wood placed in vertically that leans to the side rather than remaining upright).

Erin commented that a grate is commonly used to hold wood off the ground and enter the chamber more directly. Although the primary purpose of the grate is to improve combustion and increase ease of use, a secondary affect of the grate stove stabilization.

The act of loading fuel may cause a stove to tip in a variety of ways--removing the pot, placing fuel into loading area, pushing fuel into the combustion chamber, removing ash, placing the pot back onto the stove, etc.

Best regards,
Nate

--
Nathan Johnson
Assistant Professor
Department of Engineering & Computing Systems
Arizona State University

nathanjohnson at asu.edu<mailto:nathanjohnson at asu.edu>
480-727-5271

On Sep 25, 2013, at 11:00 AM, <stoves-request at lists.bioenergylists.org<mailto:stoves-request at lists.bioenergylists.org>>
 <stoves-request at lists.bioenergylists.org<mailto:stoves-request at lists.bioenergylists.org>> wrote:

Message: 3
Date: Wed, 25 Sep 2013 13:06:02 -0400
From: "Lanny Henson" <lannych at bellsouth.net<mailto:lannych at bellsouth.net>>
To: "Discussion of biomass cooking stoves"
<stoves at lists.bioenergylists.org<mailto:stoves at lists.bioenergylists.org>>
Subject: Re: [Stoves] Stove tipping: Stoves Digest, Vol 37, Issue 27
Message-ID: <64CCD6BBAFCC43AEAAA29DEABDBC1620 at HP>
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Nathan and all,

Nathan said "I agree that the pot contents can affect the likelihood of tipping, as well as other considerations such as fuel loading and utensils resting on the stove"

What fuel loading problems do you see for stove bumping and tipping?

I was working on a top lit combustor and since one of the problems with batch-fueled stoves is cutting fuel down to size I thought I would add a stick burning port so make the stove more flexible. For sticks to work with my design the port needed be about 6" up from the bottom. This is just above the hot charcoal but high enough to get good combustion air.

With the Rocket stove the sticks are close to the ground and this looks safer to me but long sticks protruding out 1/3 the way up looks dangerous.

When I put the sticks in they seemed to burn ok, the ignition was good they burst into flame and the exhaust looked clear, but the sticks protruding out looked like a trip lever that could easily shake the pot off the stove if anyone bumped into the sticks. I have not abandoned the idea, a stove that will do batch-fueled and also burn sticks would be more flexible, especially for extending cooking time after the batch has gone to char, but I do not see a solution at this time, except shorter sticks I suppose. Cutting sticks down to 18" or so would be easier than cutting them down to 6".

This does not seem like it would be a problem for my larger commercial/institutional stove which is heavy enough to be stable even with a bump on a sticks, so I am going to add a stick port to my next commercial size cooker to see how it works.

Is this the fuel loading problem you mentioned?

Do you think that moving a hot pot off the stove to add fuel is the problem?

If not what fuel loading problem do you see?

Safety is a big issue for me. There is nothing like screwing up to focus your mind on danger.

Lanny

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