[Gasification] Gasification Digest, Vol 40, Issue 19
Wayne Hipkin
whipkin at gmail.com
Fri Dec 20 18:42:21 CST 2013
An Open call for a very Merry New Season to all !!
We are Looking to Buy/Build A100+ KWelec We have Beetle Kill Pine
12-15% MC Whats the optimum chip size?/range Lookin @ the Liamet Screw
Chipper Many are Hope,n To Realize this Dream As we still are
waste,n to much Fiber In BC Canada
The diesel price?? or Propane
The Utilization&Job creation Thank You for any Direction We see
Indepth Tech & Advice WHipkin Merry&aHappy
On Fri, Dec 20, 2013 at 11:00 AM, <
gasification-request at lists.bioenergylists.org> wrote:
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> Today's Topics:
>
> 1. Re: raising H2 concentration in downdraft gasification
> (Rex Zietsman)
> 2. Re: raising H2 concentration in downdraftgasification (Kevin)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 20 Dec 2013 09:32:32 +0200
> From: "Rex Zietsman" <rex at whitfieldfarm.co.za>
> To: <gasification at lists.bioenergylists.org>
> Subject: Re: [Gasification] raising H2 concentration in downdraft
> gasification
> Message-ID: <007001cefd55$a5f3f840$f1dbe8c0$@whitfieldfarm.co.za>
> Content-Type: text/plain; charset="us-ascii"
>
> Hi All,
>
> The deafening silence on this post is quite interesting. At the very least
> I
> would have thought that someone would have suggested adding steam to the
> reduction zone. What about a charcoal gasifier with steam addition?
>
> Any comments on a 1.6MW/2MW thermal gasifier?
>
> Kind regards
> Rex
>
> -----Original Message-----
> From: Rex Zietsman [mailto:rex at whitfieldfarm.co.za]
> Sent: 16 December 2013 09:57 AM
> Subject: raising H2 concentration in downdraft gasification
>
> Hi All,
>
> We are looking at a system that will hydrotreat bio oils from pyrolysis,
> catalytic cracking and vegetable oil. For this we need in the region of
> 30kg
> hydrogen/ton oil. At small scale ie 1 ton oil/hour, this works out at, you
> guessed it, 30kg of hydrogen/hour. As this is a small amount in the overall
> scheme of things, we are looking at gasifying wood chips and to recover the
> hydrogen using pressure swing absorption. What I would like to know is
> whether we can increase the H2 concentration in syngas by tweaking the
> gasifier. Clearly we can look at the water gas shift reaction but, as the
> syngas has to be cooled, washed, pressurised and reheated, it is quite an
> additional investment for the scale we are looking at. If we could simply
> up
> the H2 content, we would go straight from washing to PSA. Residual gas
> would
> be piped to a diesel generator where CO and the like will be combusted
> prior
> to exhaust to atmosphere.
>
> For easy mental arithmetic, let us assume a 33% H2 concentration in dry
> syngas. 30kg/hour of H2 is 15kmol/hour or 15/0.33 = 45kmol/hour of syngas.
> A
> kmol of gas has a volume of 22.4 Nm3. So, to get 30kg/hour requires 22.4 x
> 45 = 1000 Nm3 syngas/hour (mental arithmetic here, go with the flow).
> Assuming an 80% PSA recovery this means that we need 1250Nm3/hour of
> syngas.
> Not a bad sized downdraft gasifier! Assuming 6MJ/Nm3, this is around a 2MW
> thermal unit. If we can get the H2 concentration up to say 40%, then the
> syngas requirement would be 37.5kmol/hour or 37.5/45 x 1250 = roughly 80%
> of
> 1250 or roughly 1000 Nm3 syngas/hour. This reduces the size of gasifier to
> 1.6MW thermal and more sensible in size.
>
>
> ---
> This email is free from viruses and malware because avast! Antivirus
> protection is active.
> http://www.avast.com
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>
>
> ------------------------------
>
> Message: 2
> Date: Fri, 20 Dec 2013 04:49:02 -0400
> From: "Kevin" <kchisholm at ca.inter.net>
> To: "Discussion of biomass pyrolysis and gasification"
> <gasification at lists.bioenergylists.org>
> Subject: Re: [Gasification] raising H2 concentration in
> downdraftgasification
> Message-ID: <84DD1A65A3DF403A9AB70ECD75760078 at usera594fda0bf>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Dear Rex
>
> In principle, the way to increase the Hydrogen content of "Wood Gas" is to
> add external heat to the gasifier inputs, and to reduce the "input heat
> loads".
>
> Actions that accomplish these goals would be :
> 1: Dry the wood.
> 2: Preheat the wood.
> 3: Preheat the air.
> 4: Add superheated steam to the air
>
> Best wishes,
>
> Kevin
>
> ----- Original Message -----
> From: "Rex Zietsman" <rex at whitfieldfarm.co.za>
> To: <gasification at lists.bioenergylists.org>
> Sent: Friday, December 20, 2013 3:32 AM
> Subject: Re: [Gasification] raising H2 concentration in
> downdraftgasification
>
>
> > Hi All,
> >
> > The deafening silence on this post is quite interesting. At the very
> least
> > I
> > would have thought that someone would have suggested adding steam to the
> > reduction zone. What about a charcoal gasifier with steam addition?
> >
> > Any comments on a 1.6MW/2MW thermal gasifier?
> >
> > Kind regards
> > Rex
> >
> > -----Original Message-----
> > From: Rex Zietsman [mailto:rex at whitfieldfarm.co.za]
> > Sent: 16 December 2013 09:57 AM
> > Subject: raising H2 concentration in downdraft gasification
> >
> > Hi All,
> >
> > We are looking at a system that will hydrotreat bio oils from pyrolysis,
> > catalytic cracking and vegetable oil. For this we need in the region of
> > 30kg
> > hydrogen/ton oil. At small scale ie 1 ton oil/hour, this works out at,
> you
> > guessed it, 30kg of hydrogen/hour. As this is a small amount in the
> > overall
> > scheme of things, we are looking at gasifying wood chips and to recover
> > the
> > hydrogen using pressure swing absorption. What I would like to know is
> > whether we can increase the H2 concentration in syngas by tweaking the
> > gasifier. Clearly we can look at the water gas shift reaction but, as the
> > syngas has to be cooled, washed, pressurised and reheated, it is quite an
> > additional investment for the scale we are looking at. If we could simply
> > up
> > the H2 content, we would go straight from washing to PSA. Residual gas
> > would
> > be piped to a diesel generator where CO and the like will be combusted
> > prior
> > to exhaust to atmosphere.
> >
> > For easy mental arithmetic, let us assume a 33% H2 concentration in dry
> > syngas. 30kg/hour of H2 is 15kmol/hour or 15/0.33 = 45kmol/hour of
> syngas.
> > A
> > kmol of gas has a volume of 22.4 Nm3. So, to get 30kg/hour requires 22.4
> x
> > 45 = 1000 Nm3 syngas/hour (mental arithmetic here, go with the flow).
> > Assuming an 80% PSA recovery this means that we need 1250Nm3/hour of
> > syngas.
> > Not a bad sized downdraft gasifier! Assuming 6MJ/Nm3, this is around a
> 2MW
> > thermal unit. If we can get the H2 concentration up to say 40%, then the
> > syngas requirement would be 37.5kmol/hour or 37.5/45 x 1250 = roughly 80%
> > of
> > 1250 or roughly 1000 Nm3 syngas/hour. This reduces the size of gasifier
> to
> > 1.6MW thermal and more sensible in size.
> >
> >
> > ---
> > This email is free from viruses and malware because avast! Antivirus
> > protection is active.
> > http://www.avast.com
> >
> >
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> ------------------------------
>
> End of Gasification Digest, Vol 40, Issue 19
> ********************************************
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