[Gasification] Re: Definition of a "Gasifier"

[Jigme Rangdrol]

Do you have accesss to the grading scheme for natural gas Harry John Gatley?

Can you explain why this EU requirement was established and by whom?

Thanks.

J.R.

Hararat wrote:

> What I am seeing reminds me of this issue of a minimum retention time 
> at a given temperature for the gas inside of the gasifier.  There is 
> an EU requirement and I am still not clear on the US requirements.  I 
> believe it is 2 seconds at 1500°F.  This as regards the question of a 
> classification of the product gas seems to be rather staunchly held to. 
>
> What is the current thought on retention time?  With the plasma arc, 
> high pressure oxygen blown systems does this sort of thinking apply?  
> It seems a little 'Gaia-ish' to be trying to put a box around the 
> process when it is just getting a chance to undergo some decent 
> development.  If the space velocity of the reactor is determined by 
> the rates of the reactions, fruitful collisions, devolatilization, 
> pyrolysis and heat and mass transfer kinetics, all of which are the 
> object of a chemical engineer's desire, then why fix this item and not 
> simply grade the producer gas or syngas as natural gas is graded 
> irrespective of how it is produced?
>
>
> Harry John Gatley, P.Eng.
>