Derek,
To condense the vapor, the gases must be cooler than 100 deg C. In
updraft gasifiers with the intention of direct combustion, we do NOT
want to condense the volatiles/tars/etc. We want to combust them
while still hot. If the moisture content is so high that combustion
is not possible, then some drying should be considered.
But in hot gases with moisture present, the water vapor will be heated
in the combustion (if combustion can occur). Then that hot water
vapor will go to the heat exchanger which is still well above 100 C.
Then it passes to the chimney. If, in an appropriate chimney, you can
condense the water vapor, you can regain much of the latent heat that
was taken to evaporate the moisture from the feedstock, provided that
your condenser is inside your greenhouse.
Others will have more experience than I have and can correct my statements.
Paul (Chip Energy) [email protected]
Quoting derek schulze <[email protected]>:
Wouldn't condensation be a big problem with the moisture levels up near 50%.
With the gasifier I can condense out the the moisture prior to combustion.
On Thu, Sep 23, 2010 at 3:23 PM, Don Murray, ing.
<[email protected]>wrote:
If the water content of your feed is less than 52% w.c. and the ash
content does not exceed 10% to 12% you could process the feed in a
gasification boiler without any further pretreatment.
High efficiency, robust, clean processing.
The Uniconfort VIGC gasifier is worth mention.
http://www.aesintl.net/solutions/vigc
Regards,
Don Murray,ing.
EMISPEC
2750, rue Einstein, suite 314
Québec (Qc), G1P 4R1 Canada
web: http://www.emispec.ca
Office: +1 418 266 0308 poste 245
De la fibre au KWh
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of derek schulze
Sent: 23 septembre 2010 14:44
To: Discussion of biomass pyrolysis and gasification
Subject: Re: [Gasification] wet cherry pits
I already heat my house with dried cherry pits in a modified pellet
boiler.
The trouble is that drying the pits takes a lot of energy and time. If I
am going to heat my greenhouse with them, I will need to dry in excess of
100 tons. If I can burn them wet I will save time and energy.
I have been trying to think of a way to dry the pits in the hopper as they
approach the combustion area and this is where the idea of an updraft
gasifier came to mind.
How would you envision a sidestream of the burner drying the pits?
Any further thoughts?
On Thu, Sep 23, 2010 at 1:48 PM, Energies Naturals C.B. <
[email protected]> wrote:
> Derek,
>
> gasification is great for certain puposes, but in your case I think that
a
> simple burner will do and it is far less complicated.
> Almost any pellet burner will do but you should dry your pits first.
> This can be done naturally (air) or with a sidestream of the burner.
> There are many pellet burners around.
> www.termocabi.it
> A very, very simple system is here :
> www.fundicionesreus.com
> They work !
> Rolf
>
>
>
>
>
>
> Am 23.09.2010 18:08, schrieb derek schulze:
>
>> I have a large supply of wet cherry pits and I want to burn them to
>> produce
>> hot water for heating my greenhouse.
>>
>> I have a 200,000BTU natural gas boiler I would like to run 24/7. The
hot
>> water would enter a large storage tank for immediate or later use.
>>
>> My thought was to make an updraft top loading gasifier. The hope being
>> that
>> this would dry the pits sufficiently for burning. I would run the
>> producer
>> gas through a rad to remove as much moisture as possible and then pump
the
>> dry gas into the boiler.
>>
>> I understand that an updraft style gasifier will not crack the tars.
Will
>> this require frequent cleaning of the boiler? Reduce efficiency?
>>
>> I understand the basic principles involved, but would love some input
>> before
>> I start chopping and welding.
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