[Digestion] Diesels with pilot fuel injection

[Ken Calvert]

All this is very interesting but let me  add another possibility!!
I have been told that the equilibrium point for  dissolving methane in 
diesel fuel is
70% methane to 30% diesel???   I would guess that one might have to keep 
ones fuel tank under pressure
to stop any vacuum being created on the passage to the injection pump  which 
would cause it to "vapour lock,"
but  if I was ten years younger, I would be giving it a try!!??
Lets all keep thinking!  Ken C.
----- Original Message ----- 
From: "F. Marc de Piolenc" <piolenc at archivale.com>
To: <digestion at listserv.repp.org>
Sent: Saturday, May 10, 2008 3:08 PM
Subject: [Digestion] Diesels with pilot fuel injection


> This is very encouraging. I have NACA reports from the 30s reporting
> successful use of hydrogen in diesels with pilot injection, but when
> I mention it to contemporary "experts" I get blank looks, and solemn
> assurance that it is not practical to replace more than 70% of the
> diesel fuel with gas. Here in the Philippines the main application is
> pollution reduction in big cities, and fleet vehicles - buses and
> delivery trucks - are the main target. But being able to use biogas
> in a diesel vehicle should be a strong incentive to implement
> small-scale anaerobic digestion - in piggeries especially - so this
> technique could have a further environmental benefit.
>
> Can you direct me to manufacturers of engines or conversion kits, or
> any (preferably online) information that supports my contention that
> diesels can be run on a high percentage of gas fuel without adding
> spark ignition?
>
> The NACA reports are "old," you see - and as everybody knows, the
> laws of physics and chemistry are completely different these days!
>
> Marc de Piolenc
> http://www.archivale.com/catalog/
>
> "Zietsman, Rex" <Rex at Process.co.za> wrote:
>
> Realistically, you can get down to about 70% to 80% replacement but with
> a whole lot of challenges. With bleeding into the air intake, you can
> safely replace 50% of the diesel with low risk of mechanical problems -
> over fueling, etc. If you are running at a nice steady load, you can
> increase the replacement but, to get to the really high replacement
> values, you need to control both the gas and the diesel. This is less
> straight forward than simply bleeding in the biogas.
>
> For your information, there are engines out there that have pilot diesel
> injectors in addition to the main injectors. They start with diesel on
> the main injectors, introduce gas cutting back on the diesel until only
> the pilot injectors are running. This cuts back the diesel to as low as
> 1%, just enough to fire the gas mixture. So, when answering your
> question, it is a bit of "how long is a piece of string?".
>
>
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> Beginner's Guide to Biogas
> http://www.adelaide.edu.au/biogas/
> http://info.bioenergylists.org
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