Dear Andrew
----- Original Message -----
From: <[email protected]>
To: "Discussion of biomass pyrolysis and gasification"
<[email protected]>
Sent: Saturday, January 25, 2014 7:18 AM
Subject: Re: [Gasification] Mk2 Chip Guillotine
On Fri, 24 Jan 2014 07:25:06 -0400, you wrote:
Both temperature and relative humidity are important when drying wood.
With the same air flow, you can dry wood just as quickly with 80 Degree F
air and 80% RH, as you can with 60 Degree F air and 60% RH.
I think this needs qualifying, whilst the same amount of flow can hold
similar amounts of water from the chip surface at these two
temperatures the moisture movement to the surface will be faster at
the higher temperature. So depending on chip geometry the 60 Degree
air may end up less saturated than the 80 Degree air.
# In a practical dryer, it is probably best to adjust air flow rate such
that the RH of the air leaving the dryer is close to, but less than, 100%
relative humidity. At lower temperatures, with the same relative humidity at
entering, the rate of pickup of moisture would probably be lower, and
accordingly, the air flow rate would have to be reduced, so that the
"leaving air" was adequately saturated with moisture.
# You are quite right that if 80 F and 60 F air were blown through a bed of
chips at the same flow rate, then the 60 degree air would probably be less
saturated on exit.
Best wishes,
Kevin
AJH
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