[Stoves] Stoves Digest, Vol 139, Issue 6

Mon Mar 7 21:50:44 CST 2022

Dear Andrew

Hoe about placing a short chimney inside the stove? Suspend it so the bottom just touches the top of the fuel to start, and remains "in the air" as the fuel burns down.  I suspect it will pull in the upward-bound gases and improve the quality of the downdrafting primary (I love preheated downdrafting primary air).

It might burn out the corner fuel a bit better/more completely.

I also suspect it will burn damp fuel better than any other method, largely because of the preheated primary air.  Adding moister fuel (maybe not at the very top so it ignites well) should reduce the char % yield but still burn very cleanly.

The temperature here is dropping this week from a sunny 3°C today.  We are putting a damp 12" log into the fireplace each night.  I worked out how to burn them cleanly!  Always something new.

Regards
Crispin

From: Stoves <stoves-bounces at lists.bioenergylists.org> On Behalf Of A J
Sent: Monday, March 07, 2022 20:21
To: stoves at lists.bioenergylists.org
Subject: Re: [Stoves] Stoves Digest, Vol 139, Issue 6

Crispin,

You are correct in your assement of the stove.  The stove in the current format will char 95%+ of the wood, leaving undercharred wood on the outside edges due to a lack of draft at the end of the burn.

The stove lights easy and will start out strong with just enough secondary air and finish with a weak flame with too much air.  It seemed comparable to a basic TLUD.

The pellets will settle into a funnel shape as they reduce.  I placed a 2D donut shaped piece of sheet metal under the soil layer in the previous video.

Andrew,

Crispin did a good job explaining but here are a few more videos.  My drawing skills are awful and I can't get to a paint program this week.  I will get an updated drawing next week unless Alex tells me no.

This is how it starts up.
https://youtu.be/F9OrriVw3Zk

This is considered started.
https://youtu.be/okVlI1Zv9HI

This is how it finished
https://youtu.be/JmbBuBIPlEs

This is what the inside looks like
https://youtu.be/6cuVET6uCHw

Alex,

;)   I don't have a clue as to what the right path to take is for getting this to the world.

    The simplest version of this stove is a hole in the ground and a cylindrical screen that could be made of sticks.  Oh, and some clay to seal the top and for making terra preta.

The well designed version is OMG

You are the man,

Aaron Wingle
Pyromaniac

Paul,

I'm still going to get back to you on the graphene post.  Your response was greatly appreciated.

The supply chain failed and I could not get my stove parts I needed to finish recreating the molten stuff so I put a lot of focus into designing a cheaper stove with fewer parts that also lasts longer.

Thank you for all the years of guidance,

Aaron

________________________________
From: Stoves <stoves-bounces at lists.bioenergylists.org<mailto:stoves-bounces at lists.bioenergylists.org>> on behalf of 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>>
Sent: Monday, March 7, 2022 6:00 PM
To: stoves at lists.bioenergylists.org<mailto:stoves at lists.bioenergylists.org> <stoves at lists.bioenergylists.org<mailto:stoves at lists.bioenergylists.org>>
Subject: Stoves Digest, Vol 139, Issue 6

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Today's Topics:

   1. Re: This is not a TLUD stove. (A J)
   2. Re: This is not a TLUD stove. (Crispin Pemberton-Pigott)
   3. Re: This is not a TLUD stove. (ajheggie at gmail.com<mailto:ajheggie at gmail.com>)
   4. Re: This is not a TLUD stove. (alex english)

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Message: 1
Date: Sun, 6 Mar 2022 19:21:14 +0000
From: A J <awingle at hotmail.com<mailto:awingle at hotmail.com>>
To: "stoves at lists.bioenergylists.org<mailto:stoves at lists.bioenergylists.org>"
        <stoves at lists.bioenergylists.org<mailto:stoves at lists.bioenergylists.org>>
Subject: Re: [Stoves] This is not a TLUD stove.
Message-ID:
        <DM6PR06MB65082C7863AE8CF14FD020BEB0079 at DM6PR06MB6508.namprd06.prod.outlook.com<mailto:DM6PR06MB65082C7863AE8CF14FD020BEB0079 at DM6PR06MB6508.namprd06.prod.outlook.com>>

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I've been working with a new stove design that is showing a lot of promise to char a load of wood.

The stove has no primary air holes in the Fuel chamber.

A  3 1/2" metal screen cylinder is placed in the center of the fuel chamber (16 quart bucket with a lid with a 4" exhaust hole)   Wood Pellets are added around the screen and filled to the top, just below the air inlets.  The screen leaves an open hole in the fuel chamber from the top to the bottom.

I then added soil on top of the fuel Pellets.  I packed it about an inch deep next to the screen and kept adding the soil over the top of the pellets, but left a 1" ring of exposed pellets next to the fuel chamber walls.  This "ring" supplies the primary air.

I add 1/4 cup of gasoline into the bottom of the screen, then ignite the gas.

The flame starts the pellets burning at the bottom.  As the oxygen becomes depleted the flame works itself up the screen to the top of the fuel bed.  Once the flame reaches the top it only wood gas is burning.  The secondary air is supplied through the two vortex vents on the sides of the fuel chamber.  The soil on top prevents the flames from burning the top of the fuel load.  The lid is now installed.

I'm not 100% certain how exactly the "flame front" works in this stove, but it is somehow not burning from the top down, but from the inside out. Most likely bottom up and inside out at the same time.

Near the end of the burn coals will appear on the outer ring of exposed pellets.  They have not started on fire during that process, yet.  I expect they could and that would be beneficial.

So far, I've been able to char 95% of the wood and the total fuel volume reduces about 55%.  The undercharred pieces remain at the outer edges.

This video is from the end of the burn.  You can see glowing embers appearing on the outer ring.

https://youtu.be/3xSp3RfIzxU<https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fyoutu.be%2F3xSp3RfIzxU&data=04%7C01%7C%7Cf25327541fae43b2215a08da00b3d51f%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637823069642305503%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=GligQckMbVMwwCTDYTRPSTHMmglixjQwTeXngp2sh3Q%3D&reserved=0>

I believe this design has a ton of potential to be very cheap and easy to make.  It's not perfect yet, but it is worth taking a look at.

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Message: 2
Date: Sun, 6 Mar 2022 20:14:14 +0000
From: Crispin Pemberton-Pigott <crispinpigott at outlook.com<mailto:crispinpigott at outlook.com>>
To: Discussion of biomass cooking stoves
        <stoves at lists.bioenergylists.org<mailto:stoves at lists.bioenergylists.org>>
Subject: Re: [Stoves] This is not a TLUD stove.
Message-ID:
        <DM5PR18MB213664D601C6AC67B7402CF8B1079 at DM5PR18MB2136.namprd18.prod.outlook.com<mailto:DM5PR18MB213664D601C6AC67B7402CF8B1079 at DM5PR18MB2136.namprd18.prod.outlook.com>>

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Dear Andrew

I think it is pulling air down the outside and drafting gas up the centre.  The pyrolysation of the inner fuel is fed by air coming through the fuel.  The draft is supplied by the low density flame.

It sounds good. Does it burn to completion? How does the "activity" change as the fuel disappears?

Interesting work.
Crispin

From: Stoves <stoves-bounces at lists.bioenergylists.org<mailto:stoves-bounces at lists.bioenergylists.org>> On Behalf Of A J
Sent: Sunday, March 06, 2022 12:21
To: stoves at lists.bioenergylists.org<mailto:stoves at lists.bioenergylists.org>
Subject: Re: [Stoves] This is not a TLUD stove.