[Gasification] tar cracking theory

[Ian Vincent]

Hi again

Thanks for the replies, both for Mssrs Chisholm. Is that a coincidence of 
family thing?

Now I want to know:

1. What limits the temperature, Design or Fuel or both?. Is the 1000C 
requirement difficult to achieve in practice? Or perhaps more difficult to 
achieve with some fuels than others?

2. Is the dryness of the fuel significant in achieving these temperatures 
ie quality control of fuel moisture? (my fuel is wood based)

3. Catalysts: How difficult and expensive is this? Is this where the 
amateur gets out of their depth, or is this something achievable? What 
catalysts work? And how do you apply them?

I keep hearing this idea that tar can be eliminated with correct gasifier 
design. Yet tar appears to be the plague of gasifiers. I am trying to get a 
handle on what makes a gasifier that can crack tar different from one that 
cant.

I know I am asking the right people.

TIA

Ian






At 12:00 10/09/2007 -0400, you wrote:
>On Mon, 2007-10-09 at 15:14 +1200, Ian Vincent wrote:
> > I am wondering what is the general principle in cracking the tar in a raw
> > fuel gasifier, if indeed those are the correct words. Obviously some
>
>One or more of:
>
>1 - Temperature (1000C or more)
>2 - partial oxidation
>3 - catalysis
>
>--
>- Daniel
>Fredericton, NB  Canada