Dr. Karve and list members,
On Mon, May 30, 2011 at 11:01 PM, Anand Karve <[email protected] <mailto:[email protected]>> wrote:
We are already using, in India, wood gas made from agricultural waste to run stationary internal combustion engines. But, for using it as automobile fuel, it would have to be filled into cylinders, for which the nitrogen in the wood gas would have to be removed in order to reduce its bulk and to increase its calorfiic value. Does anybody have a suggestion as to how this can be achieved?
There are no doubt exceptions in some circumstances, but biogas is generally rather more efficient at turning a hectare of plants into energy than a number of other forms of biomass conversion, and certainly less polluting. See, for example, this study <http://www.reap-canada.com/online_library/grass_pellets/40%20Developing%20Energy%20Crops%20for%20Thermal%20Ch16-Samson%20et%20al.%202009.pdf> by Roger Sampson and colleagues, or this report <http://news.mongabay.com/bioenergy/2006/10/hydrogen-out-compressed-biogas-in_01.html> about another study, done for the EU, which examined a large number of biofuel and powertrain options. More information here <http://www.renewableenergyworld.com/rea/news/article/2010/03/why-is-biogas-renewable-energys-cinderella>.
Even so, powering general-purpose ICE vehicles by the direct use of highly incompressible biomethane will only make sense at industrial scales (for example <http://www.ngvglobal.com/sewage-biogas-planned-for-delhi-buses-0517>), at least as I see it. An excellent lower-tech, distributed alternative is biodiesel production to produce liquid fuel, where the plant wastes, seed cake and the leftovers from transesterification are made into biogas (or perhaps ethanol where again, biogas is made from whatever digestible matter is not consumed in the process).
d. -- David William House "The Complete Biogas Handbook" |www.completebiogas.com| /Vahid Biogas/, an alternative energy consultancy |www.vahidbiogas.com | "Make no search for water. But find thirst, And water from the very ground will burst." (Rumi, a Persian mystic poet, quoted in /Delight of Hearts/, p. 77) http://bahai.us/
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