[Gasification] Torrified woodchips as a gasifier fuel

[Rolf Uhle]

John, in diesels this is commonly used and they call it dual fuel mode. In 
german more precisely "Zündstrahlbetrieb" which means igniting beam mode.
The ignition of a small amount of liqid fuel (+ 5 %) sparks the larger 
amount of gas. Another advantage is that certain irregularities in gas 
production  are evened out as well as it compensates a bit of the power 
loss.
I have no experience on dual fuel in otto engines, I guess that preparing a 
siutable air/fuel mixture is not so easy. Also, it is not necessary due to 
the fact that you have spark plugs which fire the ignition.
Rolf

----- Original Message ----- 
From: "john shelzi" <jshelzi at yahoo.com>
To: "Discussion of biomass pyrolysis and gasification" 
<gasification at listserv.repp.org>
Sent: Thursday, August 02, 2007 7:56 PM
Subject: Re: [Gasification] Torrified woodchips as a gasifier fuel


> Rolf, can a diesel run producer gas as well as WVO at the same time?, & 
> for that matter, can a gasoline engine run gasoline, along with producer 
> gas at the same time? John.
>
>
> Rolf Uhle <energiesnaturals at gmx.de> wrote:
>  Hallo Ken,
> if your Lister produces soot running on wvo,check compression, timing and
> iny.pressure. If it is very cold, preheat.
> My 12/1 runs on very rough wvo several hours every day and there is no 
> soot.
> Odor, o.k.-- but this is still better than diesel fumes.(to me)
> Anyway, my aim is to use the limited wvo as detonant for less limited
> woodgas in a future.
> Rolf
> ----- Original Message ----- 
> From: "Ken Boak"
> To: "Discussion of biomass pyrolysis and gasification"
>
> Sent: Tuesday, July 31, 2007 7:54 PM
> Subject: Re: [Gasification] Torrified woodchips as a gasifier fuel
>
>
>> Rolf,
>>
>> Thanks for your comments.
>>
>> I will need to try the output exhaust of the Lister to see if it contains
>> enough excess O2 to support combustion of the woodchips. Experimentation
>> later this summer ought to identify whether there is any validity in 
>> these
>> methods.
>>
>> Despite the often overstated "renewable" nature of waste vegetable oil as
>> the main fuel, there is no doubt that burning veg oil produces excess
>> soot
>> and often undesirable odours.
>>
>> Whilst I could qite easily eliminate my fossil fuel consumption by 
>> burning
>> about 2000 litres of waste vegetable oil per year in my CHP system, I am
>> fully aware that this would only create unacceptable amounts of soot and
>> undesirable exhaust fumes.
>>
>> I am looking for a way to filter this soot from the exhaust gases,
>> eliminate the "oily" odour and passing through a bed of hot char to
>> support
>> drying and torrefaction of a batch o woodchips seems one approach.
>> I also need some extra thermal energy. My house needs about 70kWh per day
>> for 5 months of the winter. Whilst currently burning natural gas to
>> provide
>> this - I want to offset this, next winter with a gasifier and a woodstove
>> boiler.
>>
>>
>>
>> Ken
>>
>>
>>
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