In article ,
The Natural Philosopher writes:
wrote:
On 14 Nov,
The Natural Philosopher wrote:

CH4 + 2O2 = CO2 = 2H2O.

well you didn't even get that right.

CO2 doesn't equal 2H20

Typo. Have you never made one?

CH4 + 2O2 = CO2 + 2H2O.

AND remember, we are not feeding them a pure oxygen stream anyway, its
mainly nitrogen.
Condensing the water is the equivalent of cooling it through 540 degrees.
so well worth it.
not when its less than 1% of the total mass

11.8% more likely! A worthwhile contribution.

cant be even close to that.

21% of air is oxygen. Even if you are exactly at the whatever its called
ratio to use ALL the oxygen, only one third of it, so 7% of the
incoming, will be in the H20.


so that's 7% of the incoming AT BEST. BUT you have added methane as
well, and that essentially dilutes the mix still further. with CO2


The more carbon to hydrogen ratio there is in the gas the less water
and the more CO2, which reduces water content still further. butane and
propane have a much higher carbon to hydrogen ration.


And you never would run a boiler at critical fuel-air tratis. You run it
well over to ensure complete combustion. And full use of teh fuel.

It's not _well_ over as that knocks the efficiency too much.
When my Keston is tuned spot-on perfect, the O2 exhaust is
5.7% and the excess air (over that used for combustion) is
37%, which results in around 40ppm CO. (CO output climbs as
the excess air reduces, because it gets harder to find enough
O2 molecules to oxidise the carbon fully to CO2. You are
balancing CO production against the inefficiency of heating
up excess air.)

A non-condensing boiler doesn't control the air flow, and
they are typically between 100% and 170% excess air.

--
Andrew Gabriel
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