[Stoves] Chimneys, rice husks [Ovens]

[Tom Miles]

Paul,

 

After discussing rice hull combustion and gasification at some length you
are now saying this is dangerous. Why, specifically? You have discussed the
potential to emit cristobalite but there is no evidence of the hazard it
presents. What evidence do you have that burning rice husks or rice straw is
a health hazard?

 

Tom 

 

From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
Paul Olivier
Sent: Friday, June 14, 2013 8:56 PM
To: JJ Claire; Discussion of biomass cooking stoves
Subject: Re: [Stoves] Chimneys, rice husks [Ovens]

 

JJ,

I would not recommend that you burn rice hulls ir rice straw.

In many cases this is quite dangerous.

Paul

 

On Sat, Jun 15, 2013 at 9:40 AM, JJ Claire <pugoclaire at yahoo.com> wrote:

Greetings one and all,

I visit the Philippines often and usually stay about six months a year.  

I often use a rice hull stove.  I would like to get a plan to build a 

concrete stove.  I am also wondering if there is such a thing as building 

an 'oven' using cement and/or concrete?  I would like to build one, 

a white model if possible, [vice a black model], if such a plan is 

available and if the technology would be practical.  We have a 

lot of rice hulls and not all that much firewood.  

I would be open to heating the oven with firewood and then 

maintaining the heat level with or by burning rice hulls.  I have

a lot of rice hulls and want to make the best use of the hulls.

I currently use the wood ashes to make lye so I can make soap, 

but I have not used any ashes from rice hulls to make lye.  I

wonder if making lye with rice hulls is possible.

The rice hull stoves we use are sort of a metal pail with a wire rack.  

I am looking for a stove, hopefully one that is hot, medium and cool, 

for cooking with rice hulls over a long number or years.   

On our island, rice hulls are still burned to 'get rid of them', and 

believe it or not, rice straw is still burned. I often ask neighboring

farmers to bring me their straw and provide them a small bit of 

cash for doing so.  We use the rice straw for making compost.

We add some rice hulls to the compost.  Most of the rice hulls

are burned for fuel to cook with.  We add the char from the cooking

process to the garden.  I am wondering if we are making the best

use of the rice hulls and if the plans I am speaking of by post 

are available.  

Please inform, I am open to suggestions and direction.

Blessings,

JJ

 

From: "ajheggie at gmail.com" <ajheggie at gmail.com>
To: Discussion of biomass cooking stoves <stoves at lists.bioenergylists.org> 
Sent: Friday, June 14, 2013 5:02 PM
Subject: Re: [Stoves] Chimneys, rice husks


[Default] On Fri, 14 Jun 2013 17:37:30 -0400,"Crispin
Pemberton-Pigott" <crispinpigott at gmail.com> wrote:

>We are experimenting in Indonesia with draft-operated buoyancy balancers to
limit the pull to the ideal even when combustion conditions change in the
large wood stoves. They are easy and cheap to make. They are mounted on the
side of the stack of all oil furnaces.

We have used them on pellet stoves (which have their own id fans) to
limit draught on an insulated ss chimney that rose through 4 floors. I
wasn't entirely happy with the idea as it raised the possibility of
the boiler room getting combustion products if the seal wasn't good, I
would have been happier if the air was sucked from outside. In fact
there was subsequently a problem but this was down to poor
maintenance.

AJH

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-- 
Paul A. Olivier PhD
26/5 Phu Dong Thien Vuong
Dalat
Vietnam

Louisiana telephone: 1-337-447-4124 (rings Vietnam)
Mobile: 090-694-1573 (in Vietnam)
Skype address: Xpolivier
http://www.esrla.com/ 

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