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

Wed Jul 13 16:31:33 CDT 2016

Paul,  my comment was related to conventional wood stoves, not TLUD.

Chimney cleaning is a need in conventional wood stoves, including rocket
stoves.  Depending on the biomass quality and frequency of usage, cleaning
is more need.  Pine wood for instance burns fiercely but produces lots of
smoke and soot accumulation within the stove and chimney.

As you can imagine, cleaning up a chimney can be very complicated and
laborious.  We are adding features to our stoves that make easier for
chimney clean up.  For our middle class customers for instance, a stove
with less cleaning requirements would be very appreciated.

I would be interested on testing again TLUD + pellets  on our Ecostove .
There is a growing demand from our clients in southern Brazil to use
pellets, and likely TLUD would do well with it.

Best

Rogério

2016-07-13 14:54 GMT-03:00 Paul Anderson <psanders at ilstu.edu>:

> 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>:
>
>> 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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