[Stoves] High mass space heating options Re: Rocket Stove forthe PLACE

Paul Olivier paul.olivier at esrla.com
Tue Oct 11 22:32:07 PDT 2011


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 <paul.olivier at esrla.com>
> *To:* Discussion of biomass cooking stoves<stoves at lists.bioenergylists.org>
> *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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>>
>>
>
>
> --
> Paul A. Olivier PhD
> 27C Pham Hong Thai Street
> 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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-- 
Paul A. Olivier PhD
27C Pham Hong Thai Street
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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