Ok, steam turbines under 250 hp aren't efficient and a turbine
needs super heated steam. But a reciprocating steam engine is
efficient and doesn't need superheated steam, so aren't these
better than trying to deal with tar in an internal combustion engine?
Stuart.
From: stuart mather <[email protected]>
To: Discussion of biomass pyrolysis and gasification
<[email protected]>
Sent: Friday, 1 February 2013 12:21 PM
Subject: Re: [Gasification] mycoremediation of tarry water
I'm just curious why syngas is ever deliberately burnt in an
internal combustion engine in a deliberate setup when surely it
would completely sidestep the tar/acids corrosion/disposal issue if
the heat was just used to power a steam turbine driven generator?
Sorry if it's a daft question.
Stuart.
From: Robert Fairchild <[email protected]>
To: Discussion of biomass pyrolysis and gasification
<[email protected]>
Sent: Friday, 1 February 2013 11:40 AM
Subject: Re: [Gasification] mycoremediation of tarry water
This might be a job for mushrooms. Really. Filter the water through
straw or woodchips then innoculate with the appropriate fungus.
It's known as mycoremediation. Paul Stamets is the expert.
See:
http://www.realitysandwich.com/mycoremediation_and_oil_spills
http://www.wsdot.wa.gov/research/reports/fullreports/464.1.pdf
Bob
--- On Thu, 1/31/13, [email protected] <[email protected]> wrote:
From: [email protected] <[email protected]>
Subject: Re: [Gasification] Gasification Digest, Vol 29, Issue 7:
scrubber water
To: [email protected]
Date: Thursday, January 31, 2013, 8:15 PM
And some of the gasifiers in India simply dump it in ponds. One
very well funded group set up large tanks ala biodigesters, that
didn't work. This is the same group that spent $200 mm on an
Australian MSW to power gasifier that was scrapped. It is not
acceptable to dump the produced water in any normal waste water
treatment system. Even in "clean" gasifier gas the moisture content
going to the engine will bring organic acids and other compounds
that will reduce the lifetime and the power output of the engine.
There are effective water treatment systems available, and after
years of trying a variety of options, we have landed on ones that
work well and are relatively inexpensive to construct and operate.
If you look at the cost of a coal gasifier water treatment plant,
it is a significant investment.
Sincerely,
Leland T. "Tom" Taylor
Thermogenics Inc.
-----Original Message-----
From: David Coote <[email protected]>
To: gasification <[email protected]>
Sent: Thu, Jan 31, 2013 5:38 pm
Subject: Re: [Gasification] Gasification Digest, Vol 29, Issue 7:
scrubber water
How were they handling the scrubber water, Tom? A colleague visited a
reasonable size gasifier in Europe where the water was stored in a
tank.
Once this tank was full their immediate option was to install another
tank. Not ideal!
Waste disposal is becoming increasingly expensive in Australia. This
would increase the cost of the power.
Regards
David
On 1/02/2013 7:00 AM, [email protected]
wrote:
> ------------------------------ Message: 20 Date: Thu, 31 Jan 2013
> 09:32:11 -0800 From: "Tom Miles" <[email protected]> To:
"'Discussion
> of biomass pyrolysis and gasification'"
> <[email protected]> Subject: Re: [Gasification]
> Power Pallet Message-ID: <00f201cdffd8$e7c8ae80$b75a0b80
[email protected]>
> Content-Type: text/plain; charset="us-ascii"
>> >yes, but remember that all that run these fuels to date are
doing so by
>>
> tolerating a dirty gas non tar solving reactor, and fighting the
tar problem
> in the filtering. on the low tech end this is nearly always a water
> scrubbing system, which really just>moves the toxic problem
somewhere else,
> and actual real world running is highly unattractive. yes, it
will work for
> the demo, but the ongoing issues with the bongwater cofferdam
challenges
> health, regulatory and general pleasurable>concerns.
>
> Not so fast. You can't write off "tar making" gasifiers
completely. While
> your observation may be true for hundreds of low cost gasifiers
now in use,
> in the last five years I have seen three small scale gas cleaning
systems
> using wet scrubbers that would pass California air quality and
safety
> regulations. One is produced commercially and was demonstrated at
the 300
> kWe scale. Another was demonstrated at 300 KWe and used on a 1
MWe system.
> One was demonstrated on a 100 kWe downdraft gasifier generating
100 kWe from
> grass seed screenings. I know of another two in development for
the 40 kWe
> scale. (I also know of at least one that has failed miserably.)
>
> Tar making gasifiers may be a solution for some very difficult
but abundant
> fuel like rice husks and agricultural residues if the tars can be
managed
> and destroyed acceptably.
>
> Tom
>
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