Forwarding Heggie Re: Energy Conversions

[ronallarson@qwest.net (Ronal W. Larson)]

For a reason that is not clear, this message from Andrew Heggie got bounced
through me.

Ron (the rest from Andrew)


On Thu, 28 Dec 2000 08:53:59 +0200, mchambwera@wwf.org.zw wrote:


>Can anyone help with conversions of the following fuels to energy
>units such (j or MJ)
>
>1 litre Kerosene or Paraffin

12.80kWhr/kg ->10.24kWhr/ltre ->36.864MJ/ltre

>1 kg firewood

bone dry
~5.28kWhr/kg ->19MJ/kg
30%mc (wwb)
~3.47kWhr/kg ->12.49MJ/kg

>1 kg charcoal

Pure? or more likely with volatiles from a retort? dry?
~7.5kWhr/kg ->27MJ/kg

>LPG

13.80kWhrs/kg ->49.68MJ/kg
6.969KWhrs/ltre ->25.80MJ/ltre

Some consideration must be given to the conversion of this potential
into the target for the heat, LPG can burn particularly efficiently.

Hope that is quick enough, the figures may vary between HHV and LHV
but are in the ball park, just picked up the list since Christmas.

I am still cogitating over remarks on dryness of wood and the
synergism with moisture in the pyrolissi/gasification zone. We had
discussed this before and dropped it. I consider this to be
interesting in relation to top down burning, continuous processes get
round this by "averaging" out the combustion conditions on discrete
pieces of biomass being in the combustion zone at one time. I have
however found one other reference to elemental carbon (soot) particles
in a continuously fed stove which may bear some discussion. As always
I have a theory but nothing to test it with ;-).

It also relates to comments on the gasification list in the
preparations of fuel, and again there was a thread, on the value of a
cheap charcoal gasifier for power generation, where I touched on a
possible mechanism to explain the mode of action.

Anyone want to take up the trail again?

AJH


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