[Digestion] {Disarmed} RE: Small Digester and Rankine Engine Questions

Sun Jan 16 18:23:39 CST 2011

hello i am interested in reciveing a copy of this report
              thanks andrew
-- 
> > Andrew Ward

> > School of Chemical Engineering
> > The University of Adelaide, Australia 5005
> > Room NM10 Engineering north
> > laboratory NG15(Biochemical and Fermentation Lab)

> > Phone: +61 8 83133150
> > Fax:   +61 8 8303 4373
> > Mobile: 0410 389 528
> >
> > E-mail: andrew.ward at adelaide.edu.au

Quoting Dominic Lapointe <projet at aptq.info>:

> Iâ€™m also interested in the report.
>
>
>
> signature3
>
>
>
>
>
>
>
> De : digestion-bounces at lists.bioenergylists.org
> [mailto:digestion-bounces at lists.bioenergylists.org] De la part de Marie
> EnvoyÃ© : 13 janvier 2011 17:42
> Ã€ : For Discussion of Anaerobic Digestion
> Cc : digestion at lists.bioenergylists.org
> Objet : Re: [Digestion] Small Digester and Rankine Engine Questions
>
>
>
>
>
> All,
>
> I am currently doing a report on approximately 20 small scale UK farm
> digesters, looking at various parameters and what makes a successful digester
> installation. Current 'industry' thinking is that digesters at this scale are
> not economically viable.  However, the smallest of these has been running
> successfully for 20 years on an organic farm with 65 cows, saving thousands
> by using the gas to heat the house and diary washings.  The average Uk dairy
> herd is about 112 cows.  Another one here has been running for more than 20
> years, heating a very large manor house. Another interesting digester running
> for more than two years digesting slurry from cows bedded on woodchip and
> sand,, as well as chicken muck. It has an automatic degritting system and the
> digester does not have to be stopped.
>
>
>
> At this scale, the reason for the success of these systems are that they
> separate the digestate which comes out of the digester, they use inexpensive
> and easily maintained gas mixing which means a low parasitic load (one is as
> little as 1watt/cubic meter), the loading is typically simple auger or
> gravity feed straight into the digester, the control system is very simple
> and the digester is integrated into the farmyard. Suitable cast iron boilers
> have lasted for 20 years and are still running.
>
>
>
> If you are interested in the report, let me know and I can send a link/copy
> when it is published.
>
>
>
> Regards
>
>
>
> Angie Bywater
>
>
> On 13 Jan 2011, at 17:16, <armoss at umd.edu>un wrote:
>
> Charles-
> There's at least one small-scale digester of that size currently operating in
> the U.S. - at the USDA Beltsville Agricultural Research Center in Beltsville,
> MD.  The dairy's herd size is roughly 125-130, with ~100 milking and
> producing manure at any given time (dry cattle are let out to pasture).  The
> digester was built in 1994 and was constructed as a continuous stirred-tank
> reactor.  I have tentative plans to conduct research on this digester
> simultaneously with a low-cost, pilot-scale digester project operating on the
> same waste-stream that's being constructed by our lab group at the University
> of Maryland.  I don't have intimate knowledge of the USDA CSTR's history, but
> I can tell you what I know.
>
> The digester was originally constructed for odor control as an upright,
> cylindrical concrete tank (I'm not sure enough of the designed HRT to give
> you information on it), and was later insulated with gunnite-coated
> styrofoam.  It operates on mechanically screw-press separated, scraped waste,
> and utilizes the biogas produced to power a boiler that circulates hot water
> through a conveyance system installed within the digester for heating;  a
> combined heat and power electric generator was installed in the mid-2000s,
> but it has never been brought online.  The digester's had a number of
> problems come up, including repeated clogging of the supply lines (originally
> 3-4" ID, now 6"), the break down of the screw-press separator and supply
> pumps, and the corrosion of the boiler due to inadequate scrubbing.  To be
> fair, many of the problems associated with the digester are the result of
> fluctuating research interest, funds, management, and the lack of an
> effective biogas scrubbing system, but they exist all the same.  Currently,
> the digester is up and operating... although obviously not ideally.
>
> Although most of the digestion systems are covered lagoons, the AgSTAR
> website <http://epa.gov/agstar/projects/index.html>  contains a link to a
> Excel file detailing the digesters currently registered in the EPA's system
> (look under "Farm Project Profiles").  A few of them approximate the herd
> numbers you're interested in.
>
> As a side note, our research at the University of Maryland, together with
> research at Ohio State and the University of Wisconsin, is attempting to
> introduce smaller-scale, lower-cost systems in the U.S.  I gave a
> presentation in October on small-scale digestion and some of the current
> efforts that you can find here
> <http://www.jgpress.com/biocycleenergy/pres_tue/Moss_bcre10_s.pdf> .
>
> Good luck hunting!
>
> -Andy
>
> Andrew R. Moss
> Sustainable Agriculture Research & Education Fellow
> University of Maryland Dept. of Environmental Science and Technology
> 1445 Animal Sci./Ag. Engineering (Bldg. 142)
> University of Maryland, College Park, MD 20742
> Phone:  (865) 363-5535
>
>
>
> ---- Original message ----
>
> Date: Wed, 12 Jan 2011 12:00:06 -0800
> From: <digestion-request at lists.bioenergylists.org>
> Subject: Digestion Digest, Vol 5, Issue 5
> To: <digestion at lists.bioenergylists.org>
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> >________________ >Today's Topics: > > 1. Small Digester and Rankine Engine
> Questions (Gould, Merrill) > 2. Re: 250kW hot water biogas boiler (Ian
> Bywater) > 3. Re: Small Digester and Rankin Engine Questions (Randy Mott) >
> 4. Re: Small Digester and Rankin Engine Questions (Sam Wampler) > 5. Re:
> Small Digester and Rankine Engine Questions (David Fulford) >________________
> >Date: Tue, 11 Jan 2011 17:07:41 +0000 >From: "Gould, Merrill"
> <gouldm at anr.msu.edu> >Subject: [Digestion] Small Digester and Rankine Engine
> Questions >To: "digestion at lists.bioenergylists.org"
> <digestion at lists.bioenergylists.org> >
>
>
>
> Greetings:
>
>
>
> I have two questions I am hoping someone has answers for:
>
> 1.       Are there small farms with digesters in the United States? When I
> say small farm I donâ€™t mean 2-3 cows, I mean a farm with around 125 dairy
> cows, which is the average herd size in Michigan. If so, where are they and
> what has been their experience with their digester? I suspect there probably
> are no small farms with digesters in the US, but I would really like to know.
> I have had numerous inquiries from farmers with small farms in West Michigan
> about putting in a digester on their farm. If my assumption is correct that
> there are no small farms with digesters, are there farms with comparable
> numbers of dairy cattle with digesters outside of the United State? If so,
> where are they and what has their experience been with their digester?
>
> 2.       Has anyone had experience using a Rankine engine as part of an
> energy producing system?
>
>
>
> Thanks in advance for any insight you can provide me.
>
>
>
> Charles Gould
>
> Michigan State University Extension
>
> West Olive, Michigan
>
>
>
> >________________ >Date: Fri, 7 Jan 2011 20:51:07 +1300 >From: Ian Bywater
> <ian.bywater at naturalsystems.co.nz> >Subject: Re: [Digestion] 250kW hot water
> biogas boiler >To: For Discussion of Anaerobic Digestion
> <digestion at lists.bioenergylists.org> >
> Hi Edward,
>
>
>
> I know a boiler expert here in Christchurch, New Zealand that I'm sure has
> the right expertise and can help.
>
>
>
> Ian Bywater
>
> On 7/01/2011, at 8:42 PM, Edward Matos wrote:
>
>
>
>
>
> A milk processing company in our vicinity (Tanga, Tanzania) has had a lasting
> interest in converting its milk pasteurising process from running on propane
> to running on biogas. I am doing them a little favour by helping them to make
> a feasibility study and find the right people that will make this happen.
> Unfortunately I have very little experience in biogas combustion and would
> like to find out if anyone here is/knows someone who could help us on this
> subject.
>
>
>
> _________________
>
> Director, Natural Systems Limited
>
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>
> PO Box 41032
>
> Christchurch 8247
>
> New Zealand
>
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>
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>
> S bywateri
>
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>
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>
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>
>
>
>
>
>
>
>
>
>
>
>
>
> >________________ >Date: Wed, 12 Jan 2011 08:50:57 +0100 >From: "Randy Mott"
> <randymott at ceeres.eu> >Subject: Re: [Digestion] Small Digester and Rankin
> Engine Questions >To: "'For Discussion of Anaerobic Digestion'"
> <digestion at lists.bioenergylists.org> >
>
>
>
> We donâ€™t do projects in the US, but my understanding is that 500 cows is a
> rule of thumb. I have some literatureâ€¦.
>
>
>
> On Rankin cycle engines, we have followed it closely in Europe and the US.
> There is about 15% more electricity that can come from the heat exhaust of
> the initial generators. The capex is about 1250 Euro/kW. We donâ€™t have much
> incentive to do it in Poland since we sell the heat and also obtain a
> co-generation certificate for each MWe.
>
>
>
> GE Jenbacher is doing some development in Europe and eventually, I believe,
> will be trying to offer this as an option on its generators.
>
>
>
> Randy Mott
>
> CEERES
>
> Warsaw
>
>
>
>
>
> From: digestion-bounces at lists.bioenergylists.org
> [mailto:digestion-bounces at lists.bioenergylists.org] On Behalf Of Gould,
> Merrill
> Sent: Tuesday, January 11, 2011 6:08 PM
> To: digestion at lists.bioenergylists.org
> Subject: [Digestion] Small Digester and Rankine Engine Questions
>
>
>
> Greetings:
>
>
>
> I have two questions I am hoping someone has answers for:
>
> 1.       Are there small farms with digesters in the United States? When I
> say small farm I donâ€™t mean 2-3 cows, I mean a farm with around 125 dairy
> cows, which is the average herd size in Michigan. If so, where are they and
> what has been their experience with their digester? I suspect there probably
> are no small farms with digesters in the US, but I would really like to know.
> I have had numerous inquiries from farmers with small farms in West Michigan
> about putting in a digester on their farm. If my assumption is correct that
> there are no small farms with digesters, are there farms with comparable
> numbers of dairy cattle with digesters outside of the United State? If so,
> where are they and what has their experience been with their digester?
>
> 2.       Has anyone had experience using a Rankine engine as part of an
> energy producing system?
>
>
>
> Thanks in advance for any insight you can provide me.
>
>
>
> Charles Gould
>
> Michigan State University Extension
>
> West Olive, Michigan
>
>
>
> >________________ >Date: Wed, 12 Jan 2011 05:20:28 -0800 >From: Sam Wampler
> <smwampler at avatarenergy.com> >Subject: Re: [Digestion] Small Digester and
> Rankin Engine Questions >To: For Discussion of Anaerobic Digestion
> <digestion at lists.bioenergylists.org> >
>
>
>
> Nick,
>
>
>
> Why donâ€™t you have Kevin answer the below question about a small digester.
>
>
>
> Sam
>
>
>
>
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> From: digestion-bounces at lists.bioenergylists.org
> [mailto:digestion-bounces at lists.bioenergylists.org] On Behalf Of Randy Mott
> Sent: Wednesday, January 12, 2011 2:51 AM
> To: 'For Discussion of Anaerobic Digestion'
> Subject: Re: [Digestion] Small Digester and Rankin Engine Questions
>
>
>
> We donâ€™t do projects in the US, but my understanding is that 500 cows is a
> rule of thumb. I have some literatureâ€¦.
>
>
>
> On Rankin cycle engines, we have followed it closely in Europe and the US.
> There is about 15% more electricity that can come from the heat exhaust of
> the initial generators. The capex is about 1250 Euro/kW. We donâ€™t have much
> incentive to do it in Poland since we sell the heat and also obtain a
> co-generation certificate for each MWe.
>
>
>
> GE Jenbacher is doing some development in Europe and eventually, I believe,
> will be trying to offer this as an option on its generators.
>
>
>
> Randy Mott
>
> CEERES
>
> Warsaw
>
>
>
>
>
>
>
> From: digestion-bounces at lists.bioenergylists.org
> [mailto:digestion-bounces at lists.bioenergylists.org] On Behalf Of Gould,
> Merrill
> Sent: Tuesday, January 11, 2011 6:08 PM
> To: digestion at lists.bioenergylists.org
> Subject: [Digestion] Small Digester and Rankine Engine Questions
>
>
>
> Greetings:
>
>
>
> I have two questions I am hoping someone has answers for:
>
> 1.       Are there small farms with digesters in the United States? When I
> say small farm I donâ€™t mean 2-3 cows, I mean a farm with around 125 dairy
> cows, which is the average herd size in Michigan. If so, where are they and
> what has been their experience with their digester? I suspect there probably
> are no small farms with digesters in the US, but I would really like to know.
> I have had numerous inquiries from farmers with small farms in West Michigan
> about putting in a digester on their farm. If my assumption is correct that
> there are no small farms with digesters, are there farms with comparable
> numbers of dairy cattle with digesters outside of the United State? If so,
> where are they and what has their experience been with their digester?
>
> 2.       Has anyone had experience using a Rankine engine as part of an
> energy producing system?
>
>
>
> Thanks in advance for any insight you can provide me.
>
>
>
> Charles Gould
>
> Michigan State University Extension
>
> West Olive, Michigan
>
>
>
> >________________ >Date: Wed, 12 Jan 2011 16:22:12 +0000 >From: David Fulford
> <davidf at kingdombio.com> >Subject: Re: [Digestion] Small Digester and Rankine
> Engine Questions >To: For Discussion of Anaerobic Digestion
> <digestion at lists.bioenergylists.org> >Cc: "Gould, Merrill"
> <gouldm at anr.msu.edu> >
> Charles and listers,
>
> The best source of information on AD in USA is the AgSTAR project run by EPA
> (www.epa.gov/agstar/). They have a database of digesters, which includes a
> few small ones.
>
> They point to the Minnesota Project  (www.mnproject.org)  which is trying to
> concentrate on biogas for small farms (125 cattle or less).
>
> Regards,
>
> David F
>
> On 11/01/2011 17:07, Gould, Merrill wrote:
>
> Greetings:
>
>
>
> I have two questions I am hoping someone has answers for:
>
> 1.       Are there small farms with digesters in the United States? When I
> say small farm I donâ€™t mean 2-3 cows, I mean a farm with around 125 dairy
> cows, which is the average herd size in Michigan. If so, where are they and
> what has been their experience with their digester? I suspect there probably
> are no small farms with digesters in the US, but I would really like to know.
> I have had numerous inquiries from farmers with small farms in West Michigan
> about putting in a digester on their farm. If my assumption is correct that
> there are no small farms with digesters, are there farms with comparable
> numbers of dairy cattle with digesters outside of the United State? If so,
> where are they and what has their experience been with their digester?
>
> 2.       Has anyone had experience using a Rankine engine as part of an
> energy producing system?
>
>
>
> Thanks in advance for any insight you can provide me.
>
>
>
> Charles Gould
>
> Michigan State University Extension
>
> West Olive, Michigan
>
>
>
>
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> http://www.adelaide.edu.au/biogas/
> and the Biogas Wiki http://biogas.wikispaces.com/
>
>
>
>
> --
>
> ********************************************************************
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> > >for more information about digestion, see >Beginner's Guide to Biogas
> >http://www.adelaide.edu.au/biogas/ >and the Biogas Wiki
> http://biogas.wikispaces.com/ >
>
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> http://www.adelaide.edu.au/biogas/
> and the Biogas Wiki http://biogas.wikispaces.com/
>
>