[Stoves] Influence of fuel-bed temperatures on CO and condensed matter emissions from packed-bed residential coal combustion

[Paul Anderson]

Crispin, Frank and all,

Interesting.   Some comments:
1.  You say
> investigated in a typical informal brazier/imbaula. 
Please confirm:   Something like a bucket with holes in the bottom.   No 
upper extension.   No attempt to have a TLUD-type concentrator or 
directed horizontal entrance of the secondary air. Just light one at the 
bottom (bottom burning only - BB) and the other at the top (meaning that 
the pyrolytic front will be moving downward through the stack of fuel, 
as migratory pyrolytic front MPF until it reaches the bottom.)

2.  So the fuel-bed temperatures were always measured in the bottom of 
the BB unit, but were measured at the position of the MPF as the MPF 
progressed downward.   Right?   If not, please describe.

3.  How did the experimenters control (make hotter or less hot) the fuel 
bed temperatures?   That would be dome by delivery of more primary air 
(O2 content) into the bottom of the imbuela units, right?   Used a 
fan?   Or some primary air restricter or obstruction?   And what were 
the temperatures (high and low) in both situation>

4.  How deep is the pile of coal fuel?

5.  Please describe the "secondary" burning.   Flames flickering on the 
top?   tall, short, etc.

6.  And which way (BB or MPF)  is the common practice in South Africa?

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 9/19/2015 1:22 PM, Crispin Pemberton-Pigott wrote:
>
> Dear Friends
>
> From the SeTAR Centre group:
>
> “Influence of fuel-bed temperatures on CO and condensed matter 
> emissions from packed-bed residential coal combustion”
>
> *Abstract 
> <https://www.researchgate.net/publication/281804591_Influence_of_fuel-bed_temperatures_on_CO_and_condensed_matter_emissions_from_packed-bed_residential_coal_combustion?requestFulltext=true>*
>
> In this paper, the influence of fire-ignition methods (which determine 
> the progression of the pyrolytic zone) and combustion temperatures on 
> CO and condensed matter (smoke) emissions during fixed-bed coal 
> combustion were investigated in a typical informal brazier/imbaula. 
> Particle and gaseous samples were drawn from the exhaust through a 
> rapid dilution sampling system (the SeTAR dilution system) before 
> being channelled to respective gas and particle analysers. Particle 
> morphologies and chemical composition of the particles were 
> investigated by a VEGA3 SEM unit with EDS. Results showed that the 
> propagation of bed temperatures in fixed-bed residential combustion 
> has an influence on the characteristics of CO and PM10 emissions. 
> Temperature stratification was found to depend on the fire-ignition 
> methods. The top-lit up-draft (TLUD) fire-ignition method produced 
> less emissions compared to bottom-lit up-draft (BLUD) fire-ignition 
> method. Bed temperatures and the propagation front have an impact on 
> aerosol formation and can highlight differences in the morphology of 
> the emitted particles and the modes of formation. Increasing 
> combustion temperature yields a decrease in emissions liquid 'tarry' 
> substances and super-aggregates (>10 μm) but also leads to an increase 
> in emissions of sub-micron soot particles. This work is significant in 
> that there is still scarce information available in literature on 
> fuel-bed temperature profiles/stratification for packed-bed 
> residential coal-burning devices.
>
>
>
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