[Stoves] The Combined Heat and Biochar Gasifier

Wed May 3 00:40:43 CDT 2023

Dear Paul Olivier

I am bit mystified by the metrics so please add some information.

The WHO does have PM emission rates, and they have ambient air PM concentrations (several actually). The current one is under 10 micrograms per cu m. You have provided a concentration as an emission rate, sort of. How can the PM emitted be a 24 HR concentration?  It depends on how diluted the sample was.

Did the people who tested the stove give you an emission rate per minute? If so, what was the firepower? Make a fire smaller reduces the PM emitted. That is why the ISO has the PM emission given per MJ delivered. In that way the work done is related to the emission rate.

There is a way to report emissions in terms of mass per cubic metre, but that means having a standard dilution level. Perhaps the testing service provided that number. It would be an oxygen concentration, for example 13%. So far there is not enough information to know how clean the stove is, other than it must be pretty good.

If they gave you a report with multiple metrics, you could share it so we see what the standard rating metrics are. It is not a problem if you send it to me and I will reply directly to you.

Best regards
Crispin

From: rongretlarson at comcast.net
Sent: May 2, 2023 11:11 PM
To: stoves at lists.bioenergylists.org; main at biochar.groups.io
Reply-to: stoves at lists.bioenergylists.org
Subject: Re: [Stoves] The Combined Heat and Biochar Gasifier

Paul:, Stoves list and (added) biochar list

These are wonderful numbers.  Congratulations.

I add the biochar list, where we seldom hear of emissions.

I know that some biochar production facilities have to pass EPA regulations in the US (and similar in other countries).  Can anyone report what regulations they have had to meet (and how hard) - similar to Paul”s for WHO?

RON

On May 1, 2023, at 3:41 AM, Paul Olivier <paul.olivier at esrla.com> wrote:

The PM emissions from my gasifier averaged 9.1 micrograms per cubic meter over 24 hours. In its definition of a clean cook stove, the World Health Organization stipulates that PM emissions should not exceed 25 micrograms per cubic meter. No problem here with respect to particulate matter: 9.1 micrograms is well below 25 micrograms.

According to WHO guidelines, carbon monoxide emissions should not exceed 28.40 ppm over a one hour period. The Lotus Fire Gasifier emitted very little CO over a one hour period: only 3.925 ppm (well within the WHO guidelines). The average CO emissions over 24 hours according to the WHO guidelines should not exceed 5.68 ppm. The average CO emissions of the gasifier was 0.491 ppm (again well within WHO guidelines).

So my gasifier easily meets standards set by the World Health Organization in terms of particulate matter and carbon monoxide emissions. About 50% of Vietnamese households burn firewood. The health problems associated with this practice are truly horrendous. Burning firewood is one of the leading causes of mortality in Vietnam. If these households stopped burning firewood and used gasifiers, households would be protected from toxic levels of human carcinogens, and human health in Vietnam would improve dramatically.

--
Paul A. Olivier PhD
104/43 Phu Dong Thien Vuong
Dalat
Vietnam

Louisiana telephone: 1-337-447-4124 (rings Vietnam)
Mobile: 090-694-1573 (in Vietnam)
Skype address: Xpolivier
http://epwt.vn/en/home/
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