[Gasification] Producer Gas Engine Paper

Thomas Reed tombreed2010 at gmail.com
Thu Jun 30 05:29:40 CDT 2011


Dear Tom Miles

(When we communicate it would be desirable to add last names.  Otherwise the post looks umbilaskeptic. )

The CO:H2 ratio in producer gas is 21:19, set by the composition of wood, 

C H1.4 O0.6

plus whatever moisture is in the wood.  

Adding water to the wood seriously reduces the already weak energy content of the wood.

How else can you add more Hydrogen?  

Just thinking out loud ....

The water gas reaction, 

C + H2O ==> CO + H2

Improves the energy content, but not the H2/CO ratio.....

So adding charcoal to wood fuel definitely improves the energy content.

()()(()

Our Woodgas stoves only pyrolyse the wood to make pyrolysis gas and  produce extra charcoal.

I'll try a mixture of charcoal and pellets this AM and report back.

While inconvenient, it is sometimes important to remember that there is a lot of H and O left in most charcoal.

Tom (Reed)





On Jun 29, 2011, at 12:09 PM, "Tom Miles" <tmiles at trmiles.com> wrote:

> Tom, Sridhar,
> 
>  
> 
> Is part of the solution to make producer gas with more hydrogen in it?
> 
>  
> 
> Tom
> 
>  
> 
> 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
> 
> www.Woodgas.com
> 
> 
> 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.  
> 
>  
> 
> Cheers,
> 
> Erin Rasmussen
> 
> TR Miles Techical Consultants Inc.
> 
> and BioEnergy Discussion Lists
> 
> erin at trmiles.com
> 
>  
> 
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