[Gasification] Dual Fuel Diesel consumption.

[Ken Calvert]

Derek, Toby and all,
                                 You are very lucky to  get your diesel 
consumption below 15% on a diesel dual fuel mode, unless the engine is 
running in a very steady mode.  A/.  It is the diesel injection side that 
tends to respond quickest to any variation of load and  the gas comes in 
along way behind.
            B/.  Diesel injectors  need at least 10% of full load fuel 
passage through them to keep them lubricated,  cool and fubctional. 
Replacing cooked injectors is an expensive  pastime.  Ken C.
----- Original Message ----- 
From: "Derek Schulze" <derek at tjgreenhouses.ca>
To: "Discussion of biomass pyrolysis and gasification" 
<gasification at listserv.repp.org>
Sent: Thursday, November 22, 2007 8:19 AM
Subject: Re: [Gasification] diesel and gasification


> If you want to burn gas from your gasification setup in a diesel engine,
> then your best bet would be a dual fuel natural gas and diesel engine.  I
> have seen these in large generator applications.  Basically, the diesel
> injector is modified to inject an extremely minute amount of diesel fuel 
> to
> be mixed with gas having intered via the intake valve mixed with air.
> Basically, the diesel fuel provides the "spark" as natural gas will not
> ignite from the pressure provided by a diesel engine.  Such an engine will
> consume exceedingly small quanitities of diesel fuel and otherwise run 
> quite
> happily on natural gas.
>
> As for solenoid valves,... you would be better to control the injection
> timing (modern gas engines use solenoid actuated nozzles along a common
> pressurized rail).  You would need very large solenoids for actuating the
> valves with sufficient force to eliminate valve float at high RPMs (when
> valves can not complete their travel cycle within a compression cycle).
>
> -Derek Schulze
> TJ Greenhouses Inc.
>
> ----- Original Message ----- 
> From: "Toby Seiler" <seilertechco at yahoo.com>
> To: <dlevine at speakeasy.net>
> Cc: <gasification at listserv.repp.org>
> Sent: Thursday, November 22, 2007 1:22 AM
> Subject: [Gasification] diesel and gasification
>
>
>> David and list members,
>>
>>  I've asked this question before and got no response on the gasification
>> list.  Have you ever seen a diesel engine with three valves per cylinder?
>> I'm thinking one exhaust, one air intake and one wood gas.  Perhaps a CNG
>> engine with that setup??  I know several engines now have four valves but
>> still with 2 flows, intake and exhaust.
>>
>>  Also have you ever seen electric solenoid operated valving on any 
>> engine?
>> Modern electronics could go a long way with a valve system that could be
>> controlled that way using a PC.
>>
>>  Regards,   Toby Seiler
>>
>>
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