<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Arial; font-size: 12pt; color: #000000'><P>Hello A.D. Karve:</P>
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<P>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)?</P>
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<P>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?</P>
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<P>Thanks,</P>
<P>Randy</P>
<P><BR>----- Original Message -----<BR>From: "Anand Karve" <adkarve@gmail.com><BR>To: "Discussion of biomass pyrolysis and gasification" <gasification@lists.bioenergylists.org><BR>Sent: Thursday, May 19, 2011 8:29:31 PM<BR>Subject: Re: [Gasification] Gasified rice husk for CNG tanks<BR><BR>Dear Randy,<BR>rice husk gasifiers are already being used in various countries,<BR>including India. However, the process of gasification would not<BR>produce hydrogen sulphide, which is normally associated with the<BR>process of anaerobic digestion of biomass. Secondly, in the<BR>gasification technologies currently in use, the heat required for the<BR>process of pyrolysis is generated by burning the biomass itself. As a<BR>result, the gas gets mixed with nitrogen in the air, which dilutes the<BR>combustible components. Unless you can find a cheap method of removing<BR>the nitrogen from the gas, selling compressed gas in cylinders would<BR>not be economically viable. Purification of biogas is relatively easy,<BR>because the main contaminant in it is carbon dioxide, which dissolves<BR>in calcium hydroxide or even in water, but rice husk is not a good raw<BR>material for producing biogas, because it won't be digested by the<BR>methanogenic organisms.<BR>Yours<BR>A.D.Karve<BR><BR>On Fri, May 20, 2011 at 7:46 AM, <randyc29@comcast.net> wrote:<BR>> Hello All,<BR>><BR>><BR>><BR>> Although I have read many articles about gasification, I have not come<BR>> across one that gave me a full picture of the feasibility of using gasified<BR>> rice husk and compressing it to fill CNG tanks.<BR>><BR>><BR>><BR>> I'm a native of the Philippines and have been living in the US for many<BR>> years. However, I plan to move back to the Philippines to possibly start an<BR>> organic farm, a piggery, or some sort of farming.<BR>><BR>><BR>><BR>> Rice husk is easily accessible in the Philippines because current method<BR>> entails the husk being burned in open air, since few has found uses for it.<BR>> Juxtaposed to this is the use of CNG/Propane tanks for cooking in majority<BR>> of households. My question is: How viable and cost effective is it to<BR>> gasify the rice husk, remove the hydrogen sulfide, and compressed the biogas<BR>> into CNG tanks?<BR>><BR>><BR>><BR>> 1. I've seen plans regarding the construction of gasifiers. I'm sort of a<BR>> handyman, and I think I can construct one, or perhaps pay a welder. It may<BR>> also be cheaper if I use materials while I'm in country.<BR>><BR>><BR>><BR>> 2. I have not seen a cheap way to remove hydrogen sulfide. Several articles<BR>> and videos I have seen required the use of metal shavings or steel wool.<BR>> Using this in a large scale may be quite expensive in the Philippines. Has<BR>> anyone come up with a better and more cost effective solution? This would<BR>> actually be a major requirement because the gas will be stored in metal<BR>> (propane) tanks<BR>><BR>><BR>><BR>> 3. I've read about some "home-use" gas compressors that are used to compress<BR>> the natural gas. Does anyone have experience on this? How much would a<BR>> system typically cost?<BR>><BR>><BR>><BR>> If I get the rice husk started, I wish to also start a piggery. Although<BR>> pig farming may provide limited profit, I wish to actually build a<BR>> bio-digester (using the same tarp as those in landfills). The biogas from<BR>> this will be used to run generators - electricity is also in demand in the<BR>> Philippines, and this investment may prove productive.<BR>><BR>><BR>><BR>> Can anyone help me on my plans? I have been doing a lot of research on my<BR>> free time, but what I see are typically successful stories with limited<BR>> details on the project. I am hoping for a more exhaustive details,<BR>> hopefully outlining the difficulties and problems they encountered in each<BR>> phase of their projects. I'm also hoping that one could help me with<BR>> valves, guages, and other gadgets/electronics I may use.<BR>><BR>><BR>><BR>> Thanks so much,<BR>><BR>> Randy Campana<BR>><BR>> _______________________________________________<BR>> Gasification mailing list<BR>><BR>> to Send a Message to the list, use the email address<BR>> Gasification@bioenergylists.org<BR>><BR>> to UNSUBSCRIBE or Change your List Settings use the web page<BR>> http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org<BR>><BR>> for more Gasifiers, News and Information see our web site:<BR>> http://gasifiers.bioenergylists.org/<BR>><BR>><BR><BR><BR><BR>-- <BR>***<BR>Dr. A.D. Karve<BR>President, Appropriate Rural Technology Institute (ARTI)<BR><BR>*Please change my email address in your records to: adkarve@gmail.com *<BR><BR>_______________________________________________<BR>Gasification mailing list<BR><BR>to Send a Message to the list, use the email address<BR>Gasification@bioenergylists.org<BR><BR>to UNSUBSCRIBE or Change your List Settings use the web page<BR>http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org<BR><BR>for more Gasifiers, News and Information see our web site:<BR>http://gasifiers.bioenergylists.org/<BR></P></div></body></html>