[Digestion] 250kW hot water biogas boiler

[Alexander Eaton]

It would make sens to start with biogas production.  Is there enough?  Back
of the envelope, I think you would need about 800-1000 m3 of biogas daily to
supply the heating need you described.  The modifications needed to a
propane appliance would be a new burner, gas line and likely a gas blower,
since the propane system relied on the pressure inside the propane tanks.
Otherwise, you should be able to use all the rest of the structure and
plumbing of the old boiler.  I usually suggest adding a second burner that
can work without removing the old burner (or figuring out a very quick and
efficient changing method), so in case there is no biogas for a few days
(cleaning, maintenance, etc.), the appliance can still run on propane.  The
economics of this switch, providing the biogas is available, are very good.

Best,

A

On Fri, Jan 7, 2011 at 8:20 AM, info <info at thecogas.nl> wrote:

> Edward,
>
>
>
> Propane and biogas cannot be integrated in one burner. You need a different
> burner head.  You should go for a burner that can be removed and than
> interchanged. We have experience with biogas burners to be used for drying
> of tea and that works very well. The tea dryer is fitted both with diesel
> fired burners and biogas fired burners. The digester we used was a large
> 4000 m3 pvc reinforced ecobag digester with mixers and with plenty of biogas
> storage. For a photo look at
> http://www.thecogas.nl/download/Indonesia%20factsheet%20eng.pdf
>
>
>
> Theo Bijman
>
>
>
> *Van:* digestion-bounces at lists.bioenergylists.org [mailto:
> digestion-bounces at lists.bioenergylists.org] *Namens *Edward Matos
> *Gepost om:* vrijdag 7 januari 2011 8:42
> *Gepost naar:* Archief van info
> *Discussie:* [Digestion] 250kW hot water biogas boiler
> *Onderwerp:* [Digestion] 250kW hot water biogas boiler
>
>
>
> Dear biodigestion experts,
>
>
>
> 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.
>
>
>
> I am looking for a someone that could make a cost-effective
> modification/replacement to the current burner, so that it can may run
> interchangeably on biogas or propane. I’ve included a few system
> specifications below:
>
>
>
> Burner make/model:                     Buderus Logano SE635
>
> Gas regulator make:                       Dreizler
>
> Gas:                                                       Propane @ 1.5
> bar (apparently not of particularly good quality)
>
> Heating power:                                 250kW
>
> Usage:                                                  230-300 litres of
> liquified propane gas /day
>
>
>
> The burner is used to heat water from around 70 degrees C to 95 degrees C
> in a boiler.
>
>
>
> Does anyone know if such a replacement/modification is typically
> financially viable? Of course this depends on the rest of the system but I
> would be interested of hearing/reading about similar switch-overs in this
> ballpark that have been carried out before with financial success in the
> context of their own systems.
>
>
>
> Many thanks for any help that could be offered.
>
>
>
> Best regards,
>
>
>
> Edward
>
>
>
> _______________________________________
> Edward Matos
>
> MEng (Hons.), AMIMechE, Hon.MSEE
>
>
> Mobile: +255(0) 686 128 037
>
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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/
>
>
>


-- 
Alexander Eaton
Sistema Biobolsa
IRRI-Mexico
RedBioLAC

Mex cel: (55) 11522786
US cel: 970 275 4505

alex at irrimexico.org
alex at sistemabiobolsa.com

sistemabiobolsa.com
www.irrimexico.org
www.redbiolac.org
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