[Stoves] SPAM: Re: Charcoal from waste - home cooking or other markets? (Re: Crispin, Anand Karve)

Thu Oct 13 19:21:54 CDT 2016

Crispin,

Adjusting the plate makes a lot of sense for that design. It would be interesting to try. What is the moisture tolerance of the Mayon Turbo? Would it take moderately wet sawdust? 

Tom

From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Crispin Pemberton-Pigott
Sent: Thursday, October 13, 2016 3:15 PM
To: 'Discussion of biomass cooking stoves' <stoves at lists.bioenergylists.org>
Subject: Re: [Stoves] SPAM: Re: Charcoal from waste - home cooking or other markets? (Re: Crispin, Anand Karve)

Dear Tom

Thanks for that.

Most people have not used a Mayon Turbo Stove which is a rice hull gasifier. I think it works with lost of small biomass. I investigated its performance for Roger Samson with two of his interns a few years ago.

What we found was that lowering the plate that holds the fuel ‘up’ (to stop it falling out the bottom) causes the char production to decrease substantially. Elevating it has the consequence of increasing the char fraction.

It is a clean burning cooking stove, while it makes char on a continuous basis – not a batch like a TLUD. I think it may be worth investigating as a sawdust charcoaler – it should have an adjustable bottom centre plate so as to be able to control the char fractions as Alex does by changing the speed of the chain grate.

Regards

Crispin

From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Tom Miles
Sent: 14-Oct-16 04:08
To: 'Discussion of biomass cooking stoves' <stoves at lists.bioenergylists.org <mailto:stoves at lists.bioenergylists.org> >
Subject: Re: [Stoves] SPAM: Re: Charcoal from waste - home cooking or other markets? (Re: Crispin, Anand Karve)

A cyclone sawdust gasifier was developed and tested by Jim (JW) cousins in New Zealand in the early 1980s. Google “cyclone gasifier” http://pubs.acs.org/doi/abs/10.1021/i200031a063

There have been various research versions since but nothing commercial. 

Jaques Lede worked on a fast pyrolysis cyclone reactor. I suspect that the char yields were pretty low. 

https://www.researchgate.net/publication/231393861_The_Cyclone_A_Multifunctional_Reactor_for_the_Fast_Pyrolysis_of_Biomass

Cyclonic pyrolysis and gasification of lighter ag residues in the 1970s and 1980s required recirculation of pyrolysis gases to maintain high mas flow in the reactor while limiting air or reactive gases. 

Tom

From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Ken Boak
Sent: Thursday, October 13, 2016 2:53 PM
To: Discussion of biomass cooking stoves <stoves at lists.bioenergylists.org <mailto:stoves at lists.bioenergylists.org> >
Subject: SPAM: Re: [Stoves] Charcoal from waste - home cooking or other markets? (Re: Crispin, Anand Karve)

Andrew & list

Hello again after a few years off.

I like the high thermal mass cyclone burner idea.

Pyrolyse the sawdust into char in a micro cyclone ( Think Dyson Root 8, Root 12 technology - but cast in alumina refracory material)

Char drops into a hopper - pyro gases are separated and go to a burner to keep the cyclones hot.

regards

Ken

On 13 October 2016 at 22:19, <ajheggie at gmail.com <mailto:ajheggie at gmail.com> > wrote:

[Default] On Thu, 13 Oct 2016 09:46:26 -0500,Paul Anderson
<psanders at ilstu.edu <mailto:psanders at ilstu.edu> > wrote:

>Rebecca, I do not know of any "small, reasonable size" method to make
>raw sawdust directly into charcoal.

As I said Chardust in Kenya initially did it in a simple down draught
burner.

>Of course it can be done in
>scientific laboratories, and probably in some expensive pyrolyzer-style
>large burners at some sawmill that wants heat, or in some fluidized bed
>gasifier that sprays in the sawdust (utilizing its small particle
>size).  I hope that somebody has a brilliant idea someday for a small
>inexpensive method, but not being done yet, as far as I know.

There have been many ways to pyrolyse sawdust, I was told of one where
the sawdust was metered into the exhaust of a diesel generator, I bet
that made some smoke.

One can envisage a simple vortex burner of high thermal mass being
initially heated up by the sawdust and later the sawdust would
centrifuge to the side and then down whilst the offgas burned  in the
upper area, the radiant heat from the walls then further carbonising
the sawdust as it fell.

Alex has shown how a chip stoker can be set to produce char and make
use of the heat, whether the char produced is marketable is another
matter.

In the Chardust case it looks like there is still lots of vendor's
waste char fines which is easier picking than making fresh from
sawdust.

Andrew

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