[Stoves] Reducing Ultrafine Particle Emissions Using Air Injection in Wood-Burning Cookstoves

[Paul Anderson]

Dear Ashok Gadgil's group, the GACC leadership, and all Stovers, ,

Very interesting.  Good that this was reported.

The results also show / suggest that more such research is needed, 
especically if using a better combustion device than a Darfur stove (a 
stick burner, not a gasifier).

The TLUD gasifier stoves already have both natural draft (ND) and forced 
air (FA) versions.  So, such comparisons could be done if using the 
equipment.   But perhaps the directing of the air injection into 
specific locations MIGHT result in even lower emissions and better 
improvement.

I believe that no producer of TLUD stoves has the capabilities of doing 
such research, nor the budget to hire Ashok's group.   If this research 
about reducing emissions is to be fully serious, those with the testing 
capabilities and those with the money now need to match with those who 
can provide ths stoves.

(Correct me if I am incorrect.)  I believe that the Berkeley / Livermore 
entity had the major role in developing and promoting the Darfur stove, 
so it is totally natural that they should have selected that Darfur 
stove to do their first round of research.  I am suggesting that they 
branch out soon to do such research on the true and inexpensive TLUD 
gasifiers (and not to the "flame jet" high vortex expensive stoves such 
as Philips / ACE-1).

I hope that Ashok and GACC and others will soon reply via this Stoves 
Listserv about prospects and plans for further research.

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 9:35 AM, Tom Miles wrote:
>  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
>
>
>
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