[Stoves] Biomass Reactor Systems Was: Re: Fuel Testing

[AJH]

On Mon, 9 Oct 2006 23:44:38 -0400, Crispin Pemberton-Pigott wrote:

>It has not been mentioned that during this discussion there are basically
>two categories of 'paper': 'mechanical paper' like kraft and cardboard boxes
>and newspaper.  That should yield the 45% figure.  It is basically bashed up
>wood.

Yes that was the sort of inference I was suggesting, mechanical pulp
is used for things like brown paper and newsprint. The mill I supplied
made the corrugated lining paper for cardboard, this was a semi
chemical pulp cooked with sulphite liquor. "Good" paper has even more
of the lignin removed and, as Crispin says, fillers like china clay
added. So when we talk about yield of fixed carbon in the char we
would need to refer it back to a dry ash free basis.

Best paper was made from recycled linen, now this all suggests to me
that for paper a low lignin content is better and this leads to the
idea that good paper should have a lower char yield at typical
charcoaling temperatures. Which brings us back to the original point
that char from different biomass will differ but we haven't definitive
proof that the char yield is proportional to lignin content, for any
given temperature.

AJH