Crispin,
This may be an affront to your technical cred, but if you could humour
me with an educated guess, I have a question. How much of the
improvement/reduction in emissions is due to 'top ignition', better
start up and how much is due to improved steady state combustion?
Alex
On 06/11/2013 3:38 PM, Crispin Pemberton-Pigott wrote:
Dear Friends
The air quality of Ulaanbaatar is famously bad because of the ignition
of coal stoves. The majority of stoves have been swapped for very much
cleaner burning ones and the impact is dramatic.
Usually in November the city air has between 500 and 4000 µg of PM2.5
If you visit https://twitter.com/UB_Air you can see Prof Lodoysamba's
twitter feed which Tweets the number every 3 hours, every alternate day.
It has almost reached 600 but that is a far cry from two years ago.
There is a (slightly misleading) article from the Guardian at
http://www.theguardian.com/world/2013/oct/20/ulan-bator-killer-winter-stoves
which discusses the air quality issue.
It says the rise in patients with respiratory illnesses from 2004-2008
is deteriorating air but it is far more likely to be the huge increase
in population -- the air was the same from 2004-2008. The population
went from 400k to 1.2m in 15 years.
Anyway, publicity is not wrong when it comes to cleaner air!
Note the feedback from consumers. The photo is of one of the
'approved' new stoves. It is a TLUD with controllable secondary and
primary air. Note the very large ring that can be removed to
accommodate huge woks. The materials used are cast iron, sheet metal
and ceramic.
Regards
Crispin
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