[Digestion] Fw: burning dung

[adkarve]

> Dear enthusiasts of biogas slurry,
>  organic manure is required to feed the soil micro-organisms, but why feed
> them with material from which all or most of the
> nutrition has already been removed? If you asked any agronomist the dose
of
> compost to be applied to a field, he would recommend doses in the
> range of 50 to 100 tons/ha. This means that  biomass from 10 hectares is
> needed
> to fertilize one hectare. This kind of agriculture is just not
> sustainable.  My advice therefore is to feed the soil micro-organisms with
a
> high calorie, non-composted material, such as green leaves. Just 125 kg
> green leaves (25 kg on dry weight basis), applied to a hectare once every
> two to three months is all the manure that one needs to apply to a field.
> We are today facing an energy crunch.  Therefore,
> burn all the dung without scruples to extract all the energy ouyt of it.
> If you want to feed the micro-organisms in the soil, apply 25 kg dry
matter
> having high nutritive value like sugar, green leaves, waste starch,
> cellulose,
> protein, fat etc. per hectare. My biogas system also works on the same
> principle and it is therefore 400 times as efficient as the dung based
> biogas system.
> Yours
> A.D.Karve
>
> ----- Original Message -----
> From: Juan Galarza <jcg at intiresources.com>
> To: 'adkarve' <adkarve at pn2.vsnl.net.in>
> Sent: Wednesday, September 05, 2007 8:15 PM
> Subject: RE: [Digestion] Electricite generation
>
>
> You are missing the point of the added value of the biofertilizer and the
> sanitation process, which seems to be more important that the biogas.
>
> Regards,
>
> Ing. Juan Galarza
> Presidente
> INTIRESOURCES CIA.LTD.
> TEL: (5939)7895013
> FAX:(5932)2569227
> www.intiresources.com
>
>
>
> -----Mensaje original-----
> De: digestion-bounces at listserv.repp.org
> [mailto:digestion-bounces at listserv.repp.org] En nombre de adkarve
> Enviado el: lunes, 03 de septiembre de 2007 19:18
> Para: Digestion at listserv.repp.org
> Asunto: Re: [Digestion] Electricite generation
>
> If you just want heat to poduce steam for running a steam turbine, you can
> as well burn the biomass directly, without converting it into biogas. A kg
> of dry dung, burned in the form of dung cakes, would yield 2200 kcal
energy.
> The same amount of dung would yield only 660 kcal energy, if it were
> converted into biogas and burned.
> Yours
> A.D.Karve
> ----- Original Message -----
> From: Bruno M. <brunoM1 at telenet.be>
> To: <Digestion at listserv.repp.org>
> Sent: Monday, September 03, 2007 10:09 PM
> Subject: Re: [Digestion] Electricite generation
>
>
> Maybe you need ( already) to rethink your endeavor,
>
> If I understand it correctly you have biogas from a digester( CH4 + CO2 )
> you like to blow that in a boiler to produce steam,
> then you gonna blow that steam into a expensive turbine,
> that drives a generator that makes electricity
>
> for your own use or selling to the grid).
> And you think blowing the rest steam of the
> turbine back into the boiler will help?
>
> To expensive and to complex i believe, on every
> conversion you gonna loose energy.
> so leave out the boiler and the expensive turbine and blow your biogas
> into an adapted motor ( ICE), that is coupled to a generator,
> find a use for the waste heat from the ICE, e.g. heating a greenhouse
> ( than you can also use the CO2 containing exaust gas as fertilizer),
> or heating your digester.
>
> Also, in your proposed setup there will be no
> real gain by blowing the turbine exit steam
> back into the boiler.
> Why?
> Let say you make 10 bar wet steam ( = 184°C ) you blow that steam
> in the turbine, you will get energy out as
> rotation of the shaft to run your generator,
> what comes out of your turbine is steam ( and
> water droplets) with a temp lower than
> 184° C. How you gonna heat your boiler who needs to get above 184°C
> with steam that is colder? ( wile your boiler is
> working the water will be constant on 184°C,
> and al heat input will then be used to convert
> water from 184°C to steam (-vapor)
> of the same temp; so there will be no real use
> (gain) for a fluidum with a temp below 184°C
> to help (pre-)heat the boiler.
>
> Maybe you can start with telling us about your system you already have
> ( how much gas a day you produce now, and whats the quality) ,
> and what your future needs are ( electricity and heat ).
>
>
> grts
> Bruno M.
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> At 12:22 3/09/2007, Francois wrote:
> >Hi all,
> >
> >I am looking for a system to produce electricite out
> >of biogaz - most likely a cogeneration steam turbine
> >that reuses the exhaust to preheat the boiler for max
> >energy efficiency.
> >Does anyone know of trade marks, sellers etc.
> >Cheers and thanks
> >Francois
> >==================================================================
>
>
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