[Gasification] FW: Gasification Digest, Vol 16, Issue 27

[Mark Ludlow]

Is this the so-called Ericsson Cyle?

-----Original Message-----
From: gasification-bounces at listserv.repp.org
[mailto:gasification-bounces at listserv.repp.org] On Behalf Of Malcolm Lefcort
Sent: Sunday, October 28, 2007 10:14 PM
To: 'Discussion of biomass pyrolysis and gasification'
Subject: [Gasification] FW: Gasification Digest, Vol 16, Issue 27

 Re: Tars, etc.

 

As you well know, Tom, we can make like the Swedes and dry, scrub, clean up,
and then pulverize, initially wet, dirty biomass, before gasifying it.
That's pretty straight forward.  Unfortunately, it is extremely costly. 

 

I don't know how many millions (billions?) of Euros were spent on the
pulverized wood gasification gas turbine project installed, deep
underground, in downtown Stockholm (or so I'm told); the cold, clean
producer gas from which is burned in a specially designed (?) gas turbine
combustion chamber.  Very interesting from a technical point of view; very
impractical from an economic point of view.

 

As far as I'm concerned, the only way to use biomass to make gas turbine
generated power is to do so indirectly: by using an external heat exchanger.
The heat exchanger replaces the combustion chamber. 

 

Products of combustion from a two-stage combustor - oops, a gasifier cum
thermal oxidizer - such as the Heuristic EnvirOcycler, are routed through
the shell side of the external heat exchanger.  Compressor discharge air
travels through the tube side of the heat exchanger.  A piece of cake.

 

See "Sawmill, Wood Waste Fuelled, 100% Recuperated, 5 MWe Gas Turbine
Co-Generation Plant", International Gas Turbine & Aeroengine Congress &
Exhibition, Stockholm, Sweden, 2nd - 5th June 1998, ASME Paper 98-GT-62.
See http://www.heuristicengineering.com/papers/papers.html

 

Malcolm Lefcort

Heuristic Engineering Inc

Vancouver, BC        

 

 

 

-----Original Message-----

From: gasification-bounces at listserv.repp.org

Sent: Sunday, October 28, 2007 8:00 AM

Today's Topics:

 

   1. Re: combustion of tarry producer gas (Tom Miles)

   2. Re: combustion of tarry producer gas (Mark Ludlow)

   3. Re: combustion of tarry producer gas (Paul S. Anderson)

   4. TLUD and Conventional updraft gasifiers (Thomas Reed)

 

 

----------------------------------------------------------------------

 

Message: 1

Date: Sat, 27 Oct 2007 09:27:06 -0700

From: "Tom Miles" <tmiles at trmiles.com>

Subject: Re: [Gasification] combustion of tarry producer gas

To: "'Discussion of biomass pyrolysis and gasification'"

      <gasification at listserv.repp.org>

Message-ID: <001601c818b6$36eac850$a4c058f0$@com>

Content-Type: text/plain;     charset="us-ascii"

 

Mark,

 

Nexterra, the newest industrial scale gasifier in North America, is working

on tar reduction for engine applications at their 8 MMBtuh pilot facility in

Kamloops, British Columbia. I suspect, however, that their solution will be

partial oxidation which burns gases to crack tars, not burning tars to

enhance gasification, which I think you are suggesting. 

http://gasifiers.bioenergylists.org/

http://gasifiers.bioenergylists.org/nexterraenergy

 

Tom 

 

> Gasification, in its present popular incarnation, assumes that 

> cracking of tarry gas requires a parasitic process deriving energy 

> from the primary reaction zone. This is very elegant, in theory, but 

> is dependent on a number of mechanical parameters such as fuel 

> condition and form factor. I ask:

> cannot the tars from a simple updraft gasifier be considered a fuel 

> source unto themselves?  Between their gaseous state and their 

> troublesome crystallized state there must be a liquid state that would 

> facilitate their transport back into either the primary 

> gasification/reduction zone or a secondary oxidation zone, providing 

> energy for the primary gasification transformation.

> 

> 

> 

> Am I dreaming?

 

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