[Stoves] Cleaning chimneys Re: Reducing Ultrafine Particle Emissions Using Air Injection in Wood-Burning Cookstoves
Crispin Pemberton-Pigott
crispinpigott at outlook.com
Wed Jul 13 14:26:19 CDT 2016
Dear Paul'n'All
Nearly all the stoves approved for the Ulaanbaatar Clean Air Program (UC-CAP) are TLUD's with chimneys. They all save maybe one can heat and cook.
I can say with some confidence that the chimney cleaning requirement is drastically reduced. The reason is obvious: they produce 93-99% less PM2.5.
The increase in PM nanoparticles is a well known consequence of 'cleaning up' the emissions. When the particle formation process is interrupted it results in smaller particles.
A caution here is that PM mass for small sizes is not relevant, they are counted instead. This means that as this topic proceeds new concepts and terminology are going to be used.
Mass concentration of particles might be reported for both so there is some overlap that serves to get a grip on the difference.
Regards
Crispin
Rogerio,
Please forgive me for changing the Subject line, but your topic is so
important that it merits discussion separate from the research results.
There are a few TLUD stoves that do have chimneys. But I have never
heard of users complaining of the need to clean chimneys on TLUD
stoves. Maybe someone can provide info for us. Todd Albi at
Silverfire has some and maybe could comment on user experiences.
My own work has not included much use of chimneys, and not for extended
periods of time. But I have seldom seen much accumulation of tarry
"gunk" that would be able to build up enough to clog a chimney.
Perhaps the lack of TLUD stoves with chimneys reflects that they do not
need chimneys when the kitchens are very well ventilated (or even
without some of its four walls).
Could you please provide us with your thoughts and experiences with
clogging of chimneys?
Paul
Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: psanders at ilstu.edu
Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.com
On 7/13/2016 10:37 AM, Rogerio carneiro de miranda wrote:
> Quite interesting.
>
> I am more interested on the aspect of reduce cleaning of chimneys. For
> chimney stoves the impact of such technology might be greater on
> reduced cleaning frequency of chimneys than on IAP directly. This may
> benefit greater adoption of chimney stoves (less cleaning), which also
> naturally minimize IAP.
>
> Rogério
>
>
>
> 2016-07-13 11:35 GMT-03:00 Tom Miles <tmiles at trmiles.com
> <mailto:tmiles at trmiles.com>>:
>
> From Ashok Gadgil's group at Berkeley:
> The following content is published on the ACS Web Editions Platform:
>
> Reducing Ultrafine Particle Emissions Using Air Injection in
> Wood-Burning Cookstoves
> Vi H. Rapp, Julien J. Caubel, Daniel L. Wilson and Ashok J. Gadgil
> Environ. Sci. Technol., Article ASAP
> DOI: 10.1021/acs.est.6b01333
> Publication Date (Web): July 13, 2016
> Copyright © 2016, American Chemical Society
> http://pubs.acs.org/doi/abs/10.1021/acs.est.6b01333
>
> Abstract
> In order to address the health risks and climate impacts
> associated with pollution from cooking on biomass fires,
> researchers have focused on designing new cookstoves that improve
> cooking performance and reduce harmful emissions, specifically
> particulate matter (PM). One method for improving cooking
> performance and reducing emissions is using air injection to
> increase turbulence of unburned gases in the combustion zone.
> Although air injection reduces total PM mass emissions, the effect
> on PM size distribution and number concentration has not been
> thoroughly investigated. Using two new wood-burning cookstove
> designs from Lawrence Berkeley National Laboratory, this research
> explores the effect of air injection on cooking performance, PM
> and gaseous emissions, and PM size distribution and number
> concentration. Both cookstoves were created using the
> Berkeley–Darfur Stove as the base platform to isolate the effects
> of air injection. The thermal performance, gaseous emissions, PM
> mass emissions, and particle concentrations (ranging from 5 nm to
> 10 μm in diameter) of the cookstoves were measured during multiple
> high-power cooking tests. The results indicate that air injection
> improves cookstove performance and reduces total PM mass but
> increases total ultrafine (less than 100 nm in diameter) PM
> concentration over the course of high-power cooking.
>
> T R Miles Technical Consultants Inc.
> tmiles at trmiles.com <mailto:tmiles at trmiles.com>
>
>
>
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