[Stoves] Cleaning chimneys Re: Reducing Ultrafine Particle Emissions Using Air Injection in Wood-Burning Cookstoves

Sat Jul 16 14:14:32 CDT 2016

Paul:

Of course soot is going to be directly impacted by biomass fuel type, humidity, etc...,  but Crispin is correct, minimal impact.  Our experience with our chimney TLUD cook stove is there is minimal buildup of soot or tar in the chimney, we expect that to be the case unless using fuels with heavy pitch, or other impurities.  We would expect minimal impact on cook stove chimney, since cooking is usually considered a short duration activity.  

Perhaps the paradigm changes though for long duration bio-char production or 24/7 TLUD prolonged heating applications.  Then obviously we better inspect our chimneys more often, I think would be a good practice.  The other discussions on chimneys are not relevant to TLUD cook stove chimney use.

Regards,

Todd Albi, SilverFire

On Wed, Jul 13, 2016 at 1:14 PM, Todd Albi <todd.r.albi at gmail.com <mailto:todd.r.albi at gmail.com> > wrote:

Paul:

Of course soot is going to be directly impacted by biomass fuel type, humidity, etc...,  but Crispin is correct, minimal impact.  Our experience with our chimney TLUD cook stove is there is minimal buildup of soot or tar in the chimney, we expect that to be the case unless using fuels with heavy pitch, or other impurities.  We would expect minimal impact on cook stove chimney, since cooking is usually considered a short duration activity.  

Perhaps the paradigm changes though for long duration bio-char production or 24/7 TTLUD heating applications.  Then obviously we better inspect our chimneys more often, I think would be a good practice.

Regards,

Todd Albi, SilverFire

On Wed, Jul 13, 2016 at 10:54 AM, Paul Anderson <psanders at ilstu.edu <mailto:psanders at ilstu.edu> > wrote:

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 <mailto:psanders at ilstu.edu> 
Skype:   paultlud    Phone: +1-309-452-7072 <tel:%2B1-309-452-7072> 
Website:  www.drtlud.com <http://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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