[Gasification] Regarding Combustion Quality of Producer gas

[english at kingston.net]

Dear Rolf or Ken,
What is an example of the  difference in advance for the two fuels at 
load?
Alex



On Saturday 13/10/2012 at 12:19 pm, Energies Naturals C.B.  wrote:
> Dear Tom and Ken and all,
>
> what you describe is the classical dual fuel mode which works, but not
> really well.
>
> Diesel and PG timing is not the same, PG should have more advance.
>
> Ken´s (and my ) Listers are easy due to the huge plug in the 
> prechamber.
> So both diesel and spark can have their own timing.
>
> This doesn´ t apply to many engines!
>
> Rolf
>
>
>
> Am 13.10.2012 15:49, schrieb Thomas Reed:
>>
>> Dear Ken and all
>>
>> Sounds below like you have it nailed.
>>
>> One option used in the past is to always have the diesel present at 
>> idle injection level, and then add producer gas to whatever power is 
>> required.  Uses more diesel, but provides great stability for igniting 
>> the too low cetane number producer gas.
>>
>> Tom Reed
>>
>>
>>
>>
>> On Oct 13, 2012, at 5:10 AM, Ken Boak<ken.boak at gmail.com>  wrote:
>>
>>>
>>> Dear Tom, and Greg,
>>>
>>> Thankyou for clarifying that it is the ~50% nitrogen content in 
>>> producer gas that gives it a high octane number, and the simple rule 
>>> of thumb that links the octane number and the maximum compression 
>>> ratio.
>>>
>>> Having read IISc literature about running converted diesel engines on 
>>> wood gas at 17:1 CR, this inspired me to continue with the conversion 
>>> project of the Lister type engine at All Power Labs, so that it could 
>>> be run at it's stock compression ratio of 17:1 on wood gas.
>>>
>>> The conversion involved keeping the original diesel injector and 
>>> fitting a spark plug through a side port, which gave direct access to 
>>> the spherical combustion chamber.
>>>
>>> The rationale behind this conversion, was to allow the diesel engine 
>>> to be started and run as a diesel, providing immediate thermal, 
>>> pneumatic and mechanical energy, which could be used to start up the 
>>> downdraft gasifier.  When the gasifier was producing good, engine 
>>> grade gas, the diesel fuel could be shut off, the woodgas introduced 
>>> to the air intake through a mixing valve and the engine would continue 
>>> to run in spark ignition mode on woodgas.
>>>
>>> This approach seems to make absolute economic sense, where the engine 
>>> would only be started and run for 5 minutes or so on diesel (or 
>>> biodiesel, WVO) and for the remainder of the daily duty would be run 
>>> on wood gas.
>>>
>>> The small team working on the Lister conversion project at the April 
>>> weekend workshop, found that the 6hp engine and alternator was still 
>>> capable of generating 2.5 kWe electrical power in wood gas mode at 600 
>>> rpm -  hardly any power derating from what it could achieve at 600 rpm 
>>> in diesel mode.
>>>
>>> The Lister type engine is a simple durable engine, still produced,  
>>> sold and in common usage around the developing world. It's basic 
>>> construction lends itself to this simple spark ignition conversion so 
>>> that it can benefit from the much reduced running costs offered by 
>>> woodgas operation.
>>>
>>>
>>> regards
>>>
>>>
>>>
>>> Ken Boak
>>>
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