[Gasification] measuring moisture content

[Thomas Reed]

Dear Fabian

You can measure the absolute Water content of wood by weighing a chip, heating to 120 C for an hour, and then re weighing.  The loss in weight is the water content.  120C is low enough so that you don't destroy any of the cellular structure, and high enough to guarantee "bone dry".  

Tom Rees

Thomas B Reed 


On May 22, 2013, at 1:35 AM, "Fabian Schmid" <fabi.klotz at web.de> wrote:

> Hey Stephen,
>  
> thanks for your hint with the moisture content curve, we also thought about drying only to a content which can be reached with air drying and then estimating this content with such diaramms.
>  
> But on the other side we never can be sure about the exact value of the moisture content, regardless of which influence it really has on the themro chemical conversion process inside a gasifier.
>  
> But when you`re doing a water boiling test it makes a difference in your results if you estimated the content only a littel bit wrong.
>  
> As our aim is to have exact results to compare stoves we really search for a possibility of minimize this error.
>  
> Grettings
>  
>  
> Fabian
>  
>  
> Gesendet: Donnerstag, 16. Mai 2013 um 14:44 Uhr
> Von: sabbadess at aol.com
> An: gasification at lists.bioenergylists.org
> Cc: troy at offgridpro.com, jared at offgridpro.com
> Betreff: Re: [Gasification] measuring moisture content
> Hi Fabian,
>  
> I hope you can see the image below:
>  
> 
>  
> The drying issue is not that big a deal.  I found that with large wood chips from a tractor chipper that the chips are suitable for gasification after 5 day in still air if they are stirred daily.  If you can buffer five days worth of fuel you can eliminate the dryer completely.  I suspect many sliced or fractured fuels of the same or lesser volume will dry in the same amount of time.
>  
> I have already produced a personal scale gasifier for cooking shown below:
>  
> 
>  
> You can see it boiling a pot of water here:
>  
> http://www.youtube.com/watch?v=m5uMUi3zzqU
>  
> http://www.youtube.com/watch?v=MbEeRm1Dmgw
>  
> It runs on a 35W air pump that can be driven by a solar panel.  I also have a larger unit that could feed multiple homes in the developing world from a single solar PV panel.  I will be shipping units in the next month.
>  
> Let me know if I can be of any help.
>  
> Stephen Abbaddessa
> -----Original Message-----
> From: Fabian Schmid <fabi.klotz at web.de>
> To: gasification <gasification at lists.bioenergylists.org>
> Sent: Thu, May 16, 2013 7:04 am
> Subject: [Gasification] measuring moisture content
>  
> Hello everybody,
>  
> our project "efficient cooking in Tanzania", realized of engineers without borders, Berlin and CHEMA, Tanzania wants to design different microgasifiers for cooking using a broad range of biomass.
>  
> We want to measure the moisture content of different biomass, including sawdust, coffee husks and wood logs for the exact evaluation of microgasifier WBTs.
> Till now we estimated the content but want to have more scientific results for a better comparison to other micogasifiers.
>  
> As our project is situated in Kagera, Tanzania there aren`t any electrical devices like a drying stove or a microwave, we also don`t want to buy a expensive moisture device. We think of heating the sample above a microgasifier (Sawdust stove or Mwoto TLUD) or heating it with steam from a boiled water pot to achieve the 106°C.
> We want to conduct the WBTs in Tanzania, because it isn`t possibel to get comparabel fuels in Berlin, Germany.
>  
> Are there any experiences regarding this problem?
> Do you have any hints?
>  
> Thanks a lot!
>  
> Gaifiers ahead.
>  
> Fabi
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