[Digestion] Small Digester and Rankine Engine Questions

[David Fulford]

Dear Angie,

Please send me a copy of your report when it is available.

Thank you,

David Fulford

On 13/01/2011 22:42, Marie wrote:
>
>
> 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
>

-- 

********************************************************************
Dr David Fulford CEnv MEI, 15, Brandon Ave, Woodley, Reading RG5 4PU
d.j.fulford at btinternet.com <mailto:d.j.fulford at btinternet.com>, Tel: 
+44(0)118 326 9779 Mob: +44(0)7746 806401
Kingdom Bioenergy Ltd, www.kingdombio.com <http://www.kingdombio.com>, 
davidf at kindombio.com <mailto:davidf at kindombio.com>

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