[Gasification] Re: Definition of a "Gasifier"

[astrupgaard]

Dear list

 

I think I can clear this matter up. It very much seems to me that you are
referring to the arbitrarily made rule on retention time for products of
combustion (flue gas) from waste incineration plants, which is 2 sec.
retentiontime in more than 850 centigrade. You can deviate from this if you
can prove that your flue gas does not hold dioxins under different
conditions.

 

Best regards/Med venlig hilsen

ENVIPOWER AS

 

Nils Peter Astrupgaard

Snerlevej 1 DK-2800 Kgs. Lyngby

+45 4061 5600

npa at envipower.dk

 

 

 

-----Original Message-----
From: gasification-bounces at listserv.repp.org
[mailto:gasification-bounces at listserv.repp.org] On Behalf Of Jigme Rangdrol
Sent: 5. maj 2006 13:59
To: gasification at listserv.repp.org
Subject: Re: [Gasification] Re: Definition of a "Gasifier"

 

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.

> 

 

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