RE: GAS-L: rated power - Dual Fuel Diesel

["Schmidt, Darren" <dschmidt@undeerc.org>]

Short answer: NO

Long answer:

I do not have direct experience with diesels, (The folks from India have the
most experience) but what I understand is that you look at it differently
from spark ignition.  Instead of derating, you are trying to replace diesel.
So the question is how much replacement can you get?  The power output will
remain constant.  Generally the diesel engine will be fitted with an
automatic carburetor, which will allow gas to be sucked into the air intake
while backing off on the diesel injection.  I believe the amount of gas
input is limited to the knock potential.  These carburetors are commercially
available for duel fuel firing of natural gas in a diesel engine, and can be
used for low Btu gas.  Some diesel fuel is always required to initiate
combustion.  I have seen reports of 90% replacement.  In one case I read a
paper where the researcher achieved 100% replacement, but the engine was
obviously running in a knocking/auto ignition mode that would eventually
ruin the engine.

-----Original Message-----
From: Tom Miles [mailto:tmiles@trmiles.com]
Sent: Monday, October 22, 2001 10:11 AM
To: Schmidt, Darren; gasification@crest.org
Subject: RE: GAS-L: rated power - Dual Fuel Diesel


Darren,

It seems like using wood gas to substitute 70% of the diesel in a  "dual 
fuel" mode is a practical solution. Do you derate the engine in that case?

Regards,

Tom

At 08:03 AM 10/22/01 -0700, Schmidt, Darren wrote:
>-----Original Message-----
>From: "Schmidt, Darren" <dschmidt@undeerc.org>
>To: gasification@crest.org
>Subject: RE: GAS-L: rated power
>Date: Mon, 22 Oct 2001 09:41:42 -0500
>MIME-Version: 1.0
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>
>Camp Lejeune, NC - A 1MWe Waukesha L7042 was operated on 150 Btu/scf wood
>gas.  After researching the serial number on the block, we determined our
>engine was originally a naturally aspirated engine retrofitted with a rotex
>turbo-charger.  Since the engine was used and older all we had to go by was
>the specifications for the L7042 turbo-charged engine.  We never baselined
>the engine on natural gas, but we did baseline it on propane.
>With that said here were the numbers:
>Fuel: natural gas, Rating: 1MWe, Output on producer gas: 350 kW, derate:
65%
>
>Fuel: propane, Rating: 650 kW, Derating: 46%
>
>I have also seen numerous examples of gasoline engines having deratings of
>up to 50% when fired on wood gas.
>
>Derating is dependant on compression ratio.  At Camp Lejeune, we could not
>get the turbo chargers to perform properly with wood gas.  If we could of
>achieved higher boost, we would have had much better results.
Theoretically
>the derating is calculated at 20-25% based on the difference in heating
>value.  You can expect to be somewhere between 25% and 50% derating.
>
>-----Original Message-----
>From: shuster [mailto:shuster@zol.co.zw]
>Sent: Monday, October 22, 2001 1:05 AM
>To: gasification forum
>Subject: GAS-L: rated power
>
>
>PLEASE COULD A FEW PEOPLE WHO ACTUALLY OPERATE  WOOD GASIFIERS TO FUEL
SPARK
>AND COMPESSION IGNITION ENGINES STATE WHAT % HP THEY OBTAIN FROM THEIR
>ENGINES COMPARED TO MANUFACTURERS SPECS WHEN RUNNING ON THE ORIGINAL FUEL.
>I.E.
>BY HOW MUCH IS A ENGINE DERATED. IS THE DERATING DEPENDENT ON THE
>COMPRESSION RATIO OF THE ENGINE.
>I AM DESPERATE FOR A THERMOCOUPLE (1200 C) TO DETERMINE TEMPS IN OUR
>GASIFIERS AND SIMPLY GAS ANALYSER (DIY ; EXHAUST GAS; TUNE UP TYPE) TO
>MEASURE ROUGHLY CO CO2 AND
>O2.
>WE NEED A STRAIGHT DONATION IM AFRAID. FOREX IS SO SCARCE AND EXSORBITANT.
>
>MANY THANKS
>ASHLEY
>
>
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Thomas R Miles          tmiles@trmiles.com
T R Miles, TCI                  Tel 503-292-0107
1470 SW Woodward Way    Fax 503-292-2919
Portland, OR 97225 USA

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