[Stoves] High mass space heating options Re: Rocket Stoveforthe PLACE
Kevin
kchisholm at ca.inter.net
Wed Oct 12 10:15:42 CDT 2011
Dear Paul
This is very interesting indeed... waste rice hulls worth about $US283 per tonne for its gas energy plus biochar value!
It is also very interesting that the Vietnamese will pay about $70 for about 1/3 tonne of biochar plus ash. Say $US200 per tonne What are the specific and tangible advantages that the Vietnamese see with rice hull biochar, such that its price of $200 per tonne is economically justifiable? Hopefully, what they use to justify the use of biochar can be used to justify the greater use of biochar throughout the rest of the world.
Are there any specific advantages to Rice Hull biochar that would not be present in biochars from other agricultural wastes that are not as high in ash? Alternatively, is it possible that other biochar, with much less silica ash content, would be even more economically justifiable?
Thanks!
Kevin
----- Original Message -----
From: Paul Olivier
To: Discussion of biomass cooking stoves
Sent: Wednesday, October 12, 2011 2:32 AM
Subject: Re: [Stoves] High mass space heating options Re: Rocket Stoveforthe PLACE
See comments.
On Wed, Oct 12, 2011 at 8:30 AM, Kevin <kchisholm at ca.inter.net> wrote:
Dear Paul
----- Original Message -----
From: Paul Olivier
To: Discussion of biomass cooking stoves
Sent: Tuesday, October 11, 2011 9:44 PM
Subject: Re: [Stoves] High mass space heating options Re: Rocket Stove forthe PLACE
...del...
For example, one kg of rice hulls produces about $0.21 in gas but only about $0.07 in biochar.
In other words, biochar comes in at only one third of the value of the gas.
# Very interesting!!
1: Does the 1.0 kG of rice hulls yield EITHER $.21 of gas OR $.07 worth of char
OR,
does it yield $.21 worth of gas + $.07 of char, total $.28 per kG?
It's not "or" but "plus".
Another way to put it is one metric ton of rice hulls is worth $283 US in gas and biochar.
2: What is the weight yield of biochar from 1 kG of rice hull?
From 30% to 50% by weight: this depends on the rate of gasification.
3: Are the people actually using this biochar for agricultural purposes?
Yes, it is commonly used throughout Vietnam.
Thanks!!
Kevin
Biochar production therefore is a by-product of gas production.
But if the the rice hull can be obtained, as is usually the case, free-of-charge,
and if biochar can be sold at a nice profit,
then gas is produced at a negative cost.
Also note that when rice hulls are properly gasified,
no smoke is produced.
So in producing gas, one earns a profit in the sale of biochar.
The big economic driver in this instance is the production of gas.
There are people in Vietnam who know nothing about the value of rice hull gas,
and they are busy each day making rice hull biochar in crude retorts.
These low-temperature retorts emit clouds of smoke that can be seen from miles around.
Focusing only on biochar production, these people do a lot of damage to the environment and should be shut down.
The biochar that they produce is anything but uniform.
For more on this, see:
http://dl.dropbox.com/u/22013094/Paper/park.pdf
See the section on gasification starting on page 79.
I am a big believer in utilizing a multiplicity of approaches with regard to biomass.
Thanks.
Paul Olivier
Vietnam
On Wed, Oct 12, 2011 at 6:40 AM, Steve Taylor <steve at thetaylorfamily.org.uk> wrote:
On 11 October 2011 17:55, Fireside Hearth <firesidehearthvashon at hotmail.com> wrote:
Dear Steve,
I spent most of my adult life teaching people how to heat their homes without smoke coming from the chimney, when I see pictures of areas where bio char is being made I see horrible air pollution from the fires,
I see "biochar" being used as an excuse for burning to clear land rather than the emissions generated being considered pollution from the process of making it.
Steve
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Mobile: 090-694-1573 (in Vietnam)
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