[Stoves] benefits from reduced indoor air pollution.

[Andrew Heggie]

On 15 October 2017 at 00:43, Crispin Pemberton-Pigott
<crispinpigott at outlook.com> wrote:

> ‎Prof Stuart Piketh said last night that the conversion of N2 to NOx is copious above 1850 C which is easily reached in a power station with only 5-6% excess air.

...but wood is already partially oxidised so the adiabatic flame
temperature is only around 1600C and I seldom see more than 1100C .

This of course is why charcoal was needed before iron could be
smelted, even then it depended on the fact iron carbide formed a
eutectic mixture that lowered the iron melting point.

P
>
> The only way to get really high temperatures, which I define as melting the ash (in the absence of significant quantities of fluxes), ‎is to blow on the fire.

Yes this is char burning



I
>
> There is a very practical side to this. Is it worth separately measuring NO and NO2 when testing a stove? Many emission standards mention pollutants and metrics that are copied straight from power stations where the combustion process and goals are very different.

I wouldn't have thought so but stand to be corrected. I worked most of
my adult life  by the exhaust of two stroke engines and they are
particularly bad for both particulates and NOx, especially when
running lean which gave some extra revs. You soon notices the acridity
 from NO2 if working in a poorly ventilated hollow.



>
> ‎So the question is, what are the appropriate measurements to make and what should be the reporting framework?


That's for someone better qualified than me to answer but black sooty
particulates come high on my list and then CO if unvented.

Andrew