Bill Freeman wrote:

Paul,
Biogas is mostly methane, highly variable, but often a bit
poorer than natural gas (~1000 BTU/ft3 is typical, altho
this is driven by contracts, some is 900).   Should burn
much like LP gas with a proper carb.  Probably a bit less
power per cubic inch.

Bill

What are some of the other constituents of natural gas and bio gas?
Oxygen? Sulfur dioxide? Nitrogen? Carbon dioxide? Etc., etc.. 
As I understand it this Ingersoll Rand NG burning huge rotary engine had
problems with the quality of the NG.

Perhaps a computer can analyze the gas quality real time and 
adjust the mixture on the fly. Perhaps the gas can economically
be pre processed to remove undesirable constituents.

If crude oil were $50 a barrel almost anything would be possible :-)

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.
ACRE NL web site.
http://home.earthlink.net/~rotaryeng/            http://www.linux.org