[Gasification] Producer Gas Engine Paper

Tom Miles tmiles at trmiles.com
Wed Jun 29 11:09:05 CDT 2011

Tom, Sridhar,


Is part of the solution to make producer gas with more hydrogen in it?




From: gasification-bounces at lists.bioenergylists.org [mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of Thomas Reed
Sent: Tuesday, June 28, 2011 6:26 PM
To: Discussion of biomass pyrolysis and gasification
Cc: Sridhar Gururaja Rao; <gasification at bioenergylists.org>
Subject: Re: [Gasification] Producer Gas Engine Paper


Dear Eric and all


You commented on the lack of knock in engines running on producer gas.  


The Octane of a fuel turns out to be 10x the compression ratio at which the engine will knock on a fuel in that engine.  


Typical gasoline engines today have a CR of 8.5 and won't knock on 85 octane gasoline, but will knock on 80 octane gasoline.


Small planes typically demand high test gasoline 100 octane and have a CR of 10:1.  


It is important to use the highest CR that a fuel will support.  Both power AND efficiency increase linearly with CR.   I believe the octane of producer gas is over 150, and I have been urging all to raise the CR of engines running PG.  


My company, CPC, ran PG in an engine with CR 15 and got no knock and spectacular power and efficiency.


It took five years to get them to do it.


Tom Reed

Dr Thomas B Reed

President, The Biomass Energy Foundation


On Jun 28, 2011, at 2:11 PM, "Erin Rasmussen" <erin at trmiles.com> wrote:

Sridhar recently forwarded us information about his paper about Producer Gas Engines. It is an interesting paper, and we've posted a link to it from the gasification web site, but you can also get it directly from the publisher with this link.


G. Sridhar and Ravindra Babu Yarasu (2010). Facts about Producer Gas Engine , Paths to Sustainable Energy, Jatin Nathwani and Artie Ng (Ed.), ISBN: 978-953-307-401-6, InTech,  Available from: http://www.intechopen.com/articles/show/title/facts-about-producer-gas-engine


To sum up, they connected an engine that has been designed to run on producer gas, to a downdraft gasifier, and recording and analyzing the results. There may be some surprises here, like the lack of knock at higher compression ratios, and the information gathering is both sound, and beautifully presented.  



Erin Rasmussen

TR Miles Techical Consultants Inc.

and BioEnergy Discussion Lists

erin at trmiles.com


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