Re: GAS-L: NOx and Gasifiers

["Dr. Sue Kelly" <skelly@woodlandchemicals.com>]

Many thanks for that information, Tom.  I will let you know if I find more
links, and if I need more details.
Sue

Tom Miles wrote:

> Dr. Kelly,
>
> Three gasifiers were installed in 1984-1986 by (the former) Combustion Power
> at the Hyperion sewage treatment plant in Los Angeles County. The sewage
> sludge was dried using light oil to displace the water in the "Carver
> Greenfield" process. The resulting dried powder was pneumatically conveyed
> into a bubbling fluidized bed. Gas was staged using partial oxidation in
> three stages before final combustion. Input N was about 8% if I recall. NOx
> was reduced from several thousand ppm to 25 ppm. The plant was dismanteled
> after they couldnt get the drying process to work properly.
>
> Michael F. Lewis and Roger Haug presented papers about it at AICHE meetings
> at the time. I had copies of Mike's papers, some of which were deleted by a
> virus a few months ago. If you have access to databases that include
> professional societies try searching for Lewis, Hyperion or sewage sludge
> gasification. Let me know if you find something. If you don't I may be able
> to find Mike.
>
> I got the following reference on a search:
> Four Stage, Fluidized Bed Gasification Process Minimizes NOX
> File Format: PDF/Adobe Acrobat - View as HTML
> ... Page 1 FOUR STAGE, FLUIDIZED BED GASIFICATION PROCESS MINIMIZES NOX F.
> Michael Lewis
> Mechanical Process & Design Roger T. Haug Division Engineer Environmental
> ...
> www.etis.net/balpyo/15icfbc/99-0205.PDF
>
> The attached pdf contains part of a presentation that Mike and Dave Hoecke
> (Enercon) presented at a conference on animal wastes in 1999. Dave has a
> combustion company near Cleveland (Elyria). I think he is still Chairman of
> an ASME Committee on Combustion Technologies. Please feel free to contact
> Mike or Dave directly.
>
> Regards,
>
> Tom
>
> ----- Original Message -----
> From: "Dr. Sue Kelly" <skelly@woodlandchemicals.com>
> To: "Tom Miles" <tmiles@trmiles.com>
> Cc: "gas" <gasification@crest.org>
> Sent: Thursday, June 27, 2002 9:42 AM
> Subject: Re: GAS-L: NOx and Gasifiers
>
> > Dear Mr. Miles:
> > Is the efficiency of the large scale sewage sludge system published?  If
> so, can
> > we get a copy of it easily?
> > Thank you.
> > Dr. Sue Kelly
> >
> > Tom Miles wrote:
> >
> > > Doug,
> > >
> > > One should not conclude that gasifiers do not make NOx. We measured NOx
> from
> > > the gasification of fuels with different nitrogen contents and found
> that,
> > > for a given system, NOx generation is proportional to N content.
> > >
> > > Comparisons of NOx reduction from gasification with staged combustion
> and
> > > flue gas recirculation with SNCR (selective non catalytic reduction
> using
> > > ammonia or urea) are welcome. To my knowledge, except for one large
> scale
> > > sewage sludge system, efficiencies of staged combustion and FGR
> techniques
> > > for high nitrogen fuels have not been published.
> > >
> > > Regards,
> > >
> > > Tom Miles
> > >
> > > ----- Original Message -----
> > > From: "Graeme Williams" <graeme@powerlink.co.nz>
> > > To: <gasification@crest.org>
> > > Sent: Wednesday, June 26, 2002 1:43 AM
> > > Subject: GAS-L: NOx and Gasifiers
> > >
> > > > Dear Colleagues,
> > > >
> > > > During the years that we have been playing with producer gas, both in
> > > > engines for power generation and for process heat in timber kilns, at
> no
> > > > time has NOx been an emission problem.
> > > >
> > > > Although gasifier temperatures are high, it appears that it just
> doesn't
> > > > happen in this process although I suppose anything is possible given
> > > certain
> > > > conditions existing.
> > > >
> > > > The adiabatic flame temperature of clean producer gas ie tar free has
> > > never
> > > > exceeded 1100 degrees Celcius, in our experience, and in fact is one
> of
> > > the
> > > > measures we use to check to see if tar is present in the gas stream.
> > > >
> > > > Hope this helps.
> > > >
> > > > Doug Williams
> > > > FLUIDYNE GASIFICATION
> > > >
> > > >
> > > > -
> > > > Gasification List Archives:
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> > > >
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> > > > www.webpan.com/BEF
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> > > >
> > > >
> > >
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> >
> >
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> > http://www.crest.org/articles/static/1/1011975339_7.html Gasification
> > http://www.crest.org/articles/static/1/1011975672_7.html Carbon
> >
>
>   ------------------------------------------------------------------------
>                    Name: an_waste.pdf
>    an_waste.pdf    Type: Acrobat (application/pdf)
>                Encoding: base64
>
>   ------------------------------------------------------------------------
> -
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>
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> http://www.crest.org/articles/static/1/1011975339_7.html Gasification
> http://www.crest.org/articles/static/1/1011975672_7.html Carbon


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http://www.crest.org/articles/static/1/1011975672_7.html Carbon