[Gasification] Gasified rice husk for CNG tanks

Fri May 20 09:09:56 CDT 2011

Dear Randy,
at least in India we use biogas as it comes out of the biogas plant.
The H2S in it burns to form SO2, but then all organic substances would
produce SO2 if burned and one does not bother to remove the SO2 from
other fuels. But if you are bent on removing H2S, pass the biogas
through a transparent pipe filled with fresh iron filings. The iron
combines with the H2S to form iron sulphide, which is black in colour.
When all the filings in the entire tube have turned black, you remove
them and fill fresh iron filings into the tube. The blackened filings
can be sold as scrap metal.
Yours
A.D.Karve

On Fri, May 20, 2011 at 9:30 PM,  <randyc29 at comcast.net> wrote:
> Hello A.D. Karve:
>
>
>
> Thank you so much for this clarification.  If I gasify the rice husks and
> pipe the gas to a genset, what other steps are there to be taken to make
> sure the gas doesn't damage the engine?  What will be the life expectancy of
> a gas engine if the gas is piped directly from the gasifier (of course via
> some filtering)?
>
>
>
> Second, I will reverse my idea and use biogas to store in CNG tanks.  If I
> do this, the question of removing the hydrogen sulfide still exists because
> of its corrosive nature on metals.  I've seen a youtube video of a dairy
> farm in california wheren he pipes the biogas straight to the municipal gas
> line.  The farmer had a setup wherein the hydrogen sulfide was removed.
> What systems are there that take care of the hydrogen sulfide?
>
>
>
> Thanks,
>
> Randy
>
> ----- Original Message -----
> From: "Anand Karve" <adkarve at gmail.com>
> To: "Discussion of biomass pyrolysis and gasification"
> <gasification at lists.bioenergylists.org>
> Sent: Thursday, May 19, 2011 8:29:31 PM
> Subject: Re: [Gasification] Gasified rice husk for CNG tanks
>
> Dear Randy,
> rice husk gasifiers are already being used in various countries,
> including India. However, the process of gasification would not
> produce hydrogen sulphide, which is normally associated with the
> process of anaerobic digestion of biomass. Secondly, in the
> gasification technologies currently in use, the heat required for the
> process of pyrolysis is generated by burning the biomass itself. As a
> result, the gas gets mixed with nitrogen in the air, which dilutes the
> combustible components. Unless you can find a cheap method of removing
> the nitrogen from the gas, selling compressed gas in cylinders would
> not be economically viable. Purification of biogas is relatively easy,
> because the main contaminant in it is carbon dioxide, which dissolves
> in calcium hydroxide or even in water, but rice husk is not a good raw
> material for producing biogas, because it won't be digested by the
> methanogenic organisms.
> Yours
> A.D.Karve
>
> On Fri, May 20, 2011 at 7:46 AM,  <randyc29 at comcast.net> wrote:
>> Hello All,
>>
>>
>>
>> Although I have read many articles about gasification, I have not come
>> across one that gave me a full picture of the feasibility of using
>> gasified
>> rice husk and compressing it to fill CNG tanks.
>>
>>
>>
>> I'm a native of the Philippines and have been living in the US for many
>> years.  However, I plan to move back to the Philippines to possibly start
>> an
>> organic farm, a piggery, or some sort of farming.
>>
>>
>>
>> Rice husk is easily accessible in the Philippines because current method
>> entails the husk being burned in open air, since few has found uses for
>> it.
>> Juxtaposed to this is the use of CNG/Propane tanks for cooking in majority
>> of households.  My question is:  How viable and cost effective is it to
>> gasify the rice husk, remove the hydrogen sulfide, and compressed the
>> biogas
>> into CNG tanks?
>>
>>
>>
>> 1. I've seen plans regarding the construction of gasifiers.  I'm sort of a
>> handyman, and I think I can construct one, or perhaps pay a welder.  It
>> may
>> also be cheaper if I use materials while I'm in country.
>>
>>
>>
>> 2. I have not seen a cheap way to remove hydrogen sulfide.  Several
>> articles
>> and videos I have seen required the use of metal shavings or steel wool.
>> Using this in a large scale may be quite expensive in the Philippines.
>> Has
>> anyone come up with a better and more cost effective solution?  This would
>> actually be a major requirement because the gas will be stored in metal
>> (propane) tanks
>>
>>
>>
>> 3. I've read about some "home-use" gas compressors that are used to
>> compress
>> the natural gas.  Does anyone have experience on this?  How much would a
>> system typically cost?
>>
>>
>>
>> If I get the rice husk started, I wish to also start a piggery.  Although
>> pig farming may provide limited profit, I wish to actually build a
>> bio-digester (using the same tarp as those in landfills).  The biogas from
>> this will be used to run generators - electricity is also in demand in the
>> Philippines, and this investment may prove productive.
>>
>>
>>
>> Can anyone help me on my plans?  I have been doing a lot of research on my
>> free time, but what I see are typically successful stories with limited
>> details on the project.  I am hoping for a more exhaustive details,
>> hopefully outlining the difficulties and problems they encountered in each
>> phase of their projects.  I'm also hoping that one could help me with
>> valves, guages, and other gadgets/electronics I may use.
>>
>>
>>
>> Thanks so much,
>>
>> Randy Campana
>>
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>>
>
>
>
> --
> ***
> Dr. A.D. Karve
> President, Appropriate Rural Technology Institute (ARTI)
>
> *Please change my email address in your records to: adkarve at gmail.com *
>
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>
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-- 
***
Dr. A.D. Karve
President, Appropriate Rural Technology Institute (ARTI)

*Please change my email address in your records to: adkarve at gmail.com *