[Stoves] Fwd: Moisture Paper

Nolbert Muhumuza muhumuza at gmail.com
Tue Jul 8 02:12:38 CDT 2014


Hey,

There is a guy making wood chips here. Yes, they are perfect for our Troika
stoves here in Uganda. Really ideal fuels

Nolbert.


2014-07-08 8:26 GMT+03:00 Otto Formo <terra-matricula at hotmail.com>:

> Thanks for the usefull information about fuel and moisture content.
> Paal always said;
> Stoves and fuel are linked together, VERY much.
>
> According to my brief and imediate understanding of the attachment, proper
> dried woodchips would be the most suitable fuel for a ND gasifier and cater
> for most situations, like cooking and biochar production.
>
> The pellet plant are in the early stage of operation, and a woodchipper
> will be operationel in Zambia, next month - GOOD.
>
> Enjoy the summer.
>
> Otto
>
> ------------------------------
> From: rongretlarson at comcast.net
> Date: Mon, 7 Jul 2014 12:45:06 -0600
> To: stoves at lists.bioenergylists.org
> Subject: [Stoves] Fwd: Moisture Paper
>
>
> List     (cc Yibo)
>
> The attachment should be of interest to quite a few on this list.   I hope
> you will react to my following comments  back to Yibo/Jackie - about to
> start a new graduate school stint in the USA.   Yibo and I interacted in
> Beijing last year for a few days - but this is the first time I have had to
> look closely at all the results.  I now consider this issue of moisture
> content to be more important than I did earlier.
>
>
> Yibo:
> Sorry for the delay in responding.  Been busy.
>
> I was surprised with some of the results.  I believe that at least some of
> the results are due to equations 1 and 2 being different from many.  Not
> wrong, just different. I would like to see graphs, where the MC is NOT
> subtracted in the denominator.   I don't really like the subtraction of the
> char energy either in Eq. 2 - but it is much preferred over Eq. 1.   My
> preference is to report separately on the three quantities separately - for
> energy to the pot (desired), to water evaporation from the fuel (no value
> to anyone), and to energy in the char (valuable to some of us).
>
> As shown, it appears in Figures 3a and 3b to be preferable to have high
> MC.  This is counter-intuitive - and I believe is due to the form of Eqs. 1
> and 2.  If you would be so good as to forward the raw data and your Excel
> spread sheet,  I am anxious to see how different efficiency definitions
> change the result.  Also,  I need to check how you calculated the energy
> effect of MC, and to know what LHV you used for your char.
>
> It is less obvious to me how to explain the results in Fig. 5.  I think it
> is because the power levels were significantly modified by MC.  Many have
> reported emissions increases at higher power levels (more primary air).
> It would be interesting to see the same curves with similar power levels.
>  That is not possible without new testing.
>
> Figure 4 was not a surprise for the wet weight basis, but I am surprised
> that there was no drop off in the char weight on a dry basis
>  (cross-hatched).  Again, I think there is a power level (airflow) issue
> here.  That will take a lot of work - I presume you had no control over
> either primary or secondary air?
>
> Congratulations on getting this paper published.  It is important.
>
> I strongly support your main conclusion on the need for testing at
> different (perhaps standard?) MC levels.
>
> Ron
>
>
>
>
> Begin forwarded message:
>
> *From: *"Huangfu Yibo" <hfyblx at 163.com>
> *Subject: **Re:Re: Moisture Paper*
> *Date: *July 1, 2014 at 8:07:18 PM MDT
> *To: *"Ronal W. Larson" <rongretlarson at comcast.net>
>
>
> Dear Professor,
>
> I booked the ticket on Aug. 11th. from Beijing to Pullman. I have been the
> new ARC lab for one time, which is quite a big place far away from the
> town, near a small river and in the forest.
>
> Of course you can send it to the stovelist, and I am looking forward to
> the comments, too ^_^
>
>
> Best wishes
>
> Yibo
>
> At 2014-07-02 09:19:42, "Ronal W. Larson" <rongretlarson at comcast.net>
> wrote:
>
> Yibo  - see below
>
> <snip non pertinent exchanges>
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-- 
Nolbert Muhumuza
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*Awamu Biomass Energy Ltd.*
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