[Stoves] Cuber and size of densifying machines. (no longer Re: The wood and char and fuel "debate" )

Nolbert Muhumuza muhumuza at gmail.com
Thu Mar 6 04:47:55 CST 2014


Bjarne Laustsen,

Actually they both use the screw presses. They make high density briquettes.

Nolbert.

2014-03-06 13:42 GMT+03:00, Bjarne Laustsen <bjarne at kiwlau.com>:
> Nolbert Muhumuza
>
> One of the issues with briquette production is to get briquettes of high
> density.
> High density will help in reducing the risk of picking up moisture in
> the briquettes.
> Then there are also the issue of type of raw materials used for making
> briquettes, especially the moisture content.
>
> I am aware that some briquettes producers in Uganda are using hydraulic
> piston presses. These presses typically produce briquttes of lower
> density than briquettes produced on either screw presses or mechanical
> piston presses. So it is better to use these last ones when making
> briquettes for gasifier stoves.
>
> Bjarne Laustsen
>
> On 3/6/2014 12:10 PM, Nolbert Muhumuza wrote:
>> Mr. Bjarne Laustsen,
>>
>> We have a 2-3 commercial briquette producers in Uganda. One particular
>> company gave us an excellent sample for our Quad gasifier stoves.
>> However the quality soon deteriorated (for two subsequent supplies),
>> they became un-burnable in the gasifiers. They were very smoky, picked
>> up moisture quite easily. So we had to dry them a day before cooking
>> each meal.
>>
>> Reason was variations in feedstock mixtures, due to infrequent
>> supplies. These guys drive all around the country collecting biomass
>> feedstock, so they surely couldn't maintain a steady and consistent
>> supply of feedstock which affected their final product. The other
>> company added chicken droppings, which also made the briquettes smoky.
>>
>> Dr. Paul Anderson once picked high density (only wood shavings) from
>> Zambia, they were excellent.
>>
>> Hope you put some of these issues in consideration as you prepare to
>> use briquettes in gasifiers.
>>
>> Regards, Nolbert.
>>
>> 2014-03-06 10:32 GMT+03:00, Bjarne Laustsen <bjarne at kiwlau.com>:
>>> To Paul and others
>>> Fuel supply can be big business but it does not need to be.
>>> We have been making pellets for gasification stoves.
>>> The pellets in itself work very well if they are in sizes from 6 mm or 8
>>> mm in diameter, they have been burning very good in our gasification
>>> stoves.
>>> The problems in relation with pellets for gasification stoves are how to
>>> find good and sustainable pellet presses for producing the pellets.
>>> The slides from the presentation from Crane Wang MUYANG illustrate this
>>> very well. Because the pellet press they shows are big and expensive
>>> equipments that will do a good job, however they are outside the
>>> financial reach of most of us.
>>> We have experiences with some of the smaller and cheaper pellets mills,
>>> and they are not able to produce pellets in a sustainable way. They are
>>> designed for feed pellet production, and they aretherefore not able to
>>> produce fuel pellets in an economical way.
>>>
>>> I have noted that in China they are mainly working with pellets for fuel
>>> production while in India they are working with briquettes.
>>>
>>> For me to see the cuber will still be an to expensive solution.
>>>
>>> The solution for us will be to use the Indian type of mechanical piston
>>> briquette presses that can make briquettes with diameter of 60 mm and
>>> get attached a puck cutter on that so the briquettes are cut out in
>>> pucks. Such pucks will be a good fuel for gasification stoves. And the
>>> equipment is reasonable in price so it is possible for many to finance
>>> such a solution.
>>>
>>> These briquette presses can work with most types of agricultural
>>> residues, so we at the same can shift to using renewable biomass for
>>> cooking and in this way also contribute to reducing the deforestation.
>>>
>>> Bjarne Laustsen
>>>
>>> On 3/5/2014 10:47 PM, Paul Anderson wrote:
>>>> Stovers,
>>>>
>>>> Slide #9 of the presentation at the site given below is interesting.
>>>> Those cubes should work very well in gasifiers of many different sizes.
>>>>
>>>> I was impressed by the other slides that show the very large sizes of
>>>> the pelletizers and cubers.   If supply of raw materials is
>>>> sufficient, large machines seem so much more appropriate than 100 or
>>>> 1000 small units.   Fuel supply is BIG business.
>>>>
>>>> Paul
>>>>
>>>> Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
>>>> Email:  psanders at ilstu.edu
>>>> Skype: paultlud      Phone: +1-309-452-7072
>>>> Website:  www.drtlud.com
>>>>
>>>> On 3/5/2014 9:58 AM, Energies Naturals C.B. wrote:
>>>>> Hello Michael,
>>>>>
>>>>> .....
>>>>>
>>>>> We saw some examples of cubers in a Beijing(?) stove exposition some
>>>>> time ago.
>>>>>
>>>>> Also check this:
>>>>> http://www.novator.se/bioint/BPUA12Pres/10_BPUA12_Crane_Wang_MUYANG.pdf
>>>>>
>>>>> Hope this helps
>>>>>
>>>>> Rolf
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Wed, 26 Feb 2014 10:36:47 -0600
>>>>> Michael Mahowald <memahowald at hotmail.com> wrote:
>>>>>
>>>>>> You are absolutely correct Paul !
>>>>>> Deforestation happens all over the world with the lack of fire wood.
>>>>>> There simply is not enough dry sources of trees or waste from them
>>>>>> even for TLUD's to keep even poor consumers interested in them.
>>>>>> We know vetiver grass has the highest photosynthetic activity of any
>>>>>> plant, making it the most renewable energy source on the planet.
>>>>>> We just have to densify the grass into pellets at a cost that people
>>>>>> can afford.  The only way we can do this is to eliminate the cost of
>>>>>> diesel fuel to run the generator to make the pellets.
>>>>>> We are planning on using a downdraft gasifier for gas to accomplish
>>>>>> this.  We just have to perfect this process and size it for a
>>>>>> portable pelleting plant that can be taken to the fields they grow
>>>>>> it.
>>>>>> When we perfect this it will be capable to work everywhere in the
>>>>>> world that needs clean cook stoves.
>>>>>> If you want to see what we are doing check out
>>>>>> http://haitireconstruction.ning.com/page/grass-energy
>>>>>> and
>>>>>> http://haitireconstruction.ning.com/page/sustainable-path-on-how-to
>>>>>>
>>>>>> Michael E. MahowaldPresident
>>>>>> Haiti Reconstruction International952-220-6814
>>>>>>
>>>>>> Date: Tue, 25 Feb 2014 20:43:31 -0600
>>>>>> From: psanders at ilstu.edu
>>>>>> To: stoves at lists.bioenergylists.org; biochar at yahoogroups.com
>>>>>> Subject: [Stoves] The wood and char and fuel "debate" (was a long
>>>>>> time ago called Re: Request for technology proposals - Clean Stove
>>>>>> Initiative, Indonesia)
>>>>>>
>>>>>>
>>>>>>                     Dear Crispin, Ron and all,
>>>>>>
>>>>>>
>>>>>>         It is interesting reading the back and forth between Ron and
>>>>>>         Crispin.   I emphasize two paragraphs from Crispin,
>>>>>>
>>>>>>
>>>>>>         On 2/24/2014 10:10 AM, Crispin Pembert-Pigott wrote:
>>>>>>
>>>>>>           There
>>>>>>               is no dispute between us whatsoever as to the energy
>>>>>>               consumption: the energy remaining in the char
>>>>>> represents
>>>>>>               energy not liberated from the fuel consumed.
>>>>>>                     The
>>>>>>               important question is not what we want, but what the
>>>>>>               customer of the test result wants. They are not asking
>>>>>> how
>>>>>>               much energy was used when cooking, they asked how much
>>>>>> fuel
>>>>>>               was consumed. The answer is of course different if
>>>>>> there is
>>>>>>               char remaining and that char is not 'fuel' to the same
>>>>>> stove
>>>>>>               for the next fire.
>>>>>>                             For the vast majority of "customers"
>>>>>> (including governments that
>>>>>>       want to reduce or reverse deforestation), the important
>>>>>> question is
>>>>>>       "how much wood is burned."    The interests are highly related
>>>>>> to
>>>>>>       WOOD, specifically related to TREES, not even counting sawdust
>>>>>> that
>>>>>>       goes into pellets.
>>>>>>
>>>>>>
>>>>>>       So, because TLUD stoves are VERY GOOD at burning NON-wood
>>>>>> biomass,
>>>>>>       the wood saved can be 100%.   And we still get the char.
>>>>>>
>>>>>>
>>>>>>       Concerning fuel and wood and non-wood and char and other such
>>>>>>       measurements, the real problems can come from rankings and
>>>>>> Tiers and
>>>>>>       o
>>>>>> ther reports that could give excellent stoves some poor results
>>>>>>       because the "authorities" are defining fuel as being
>>>>>> exclusively
>>>>>>       wood, as in trees and woodlands that need to be protected.
>>>>>>
>>>>>>
>>>>>>       If we could get past that "imposed intellectual construct" of
>>>>>> fuel
>>>>>>       being wood, we could make more progress about some types of
>>>>>> biomass
>>>>>>       stoves being even better than good for the environment.
>>>>>>
>>>>>>
>>>>>>       Rest assured that the advocates of alcohol and kerosene and
>>>>>> other
>>>>>>       NON-biomass fuels are pointing out that their stoves help
>>>>>> minimize
>>>>>>       deforestation/enviromental degradation.
>>>>>>
>>>>>>
>>>>>>       Biomass that is NOT WOOD needs to be recognized as being
>>>>>> favorable
>>>>>>       for saving trees, and credit given to the stoves that can use
>>>>>> those
>>>>>>       non-wood biomass fuels.
>>>>>>
>>>>>>
>>>>>>       AND that recognition and credit needs to be EXPLICITLY STATED
>>>>>> IN THE
>>>>>>       REPORTS ABOUT FUEL CONSUMPTION.
>>>>>>
>>>>>>
>>>>>>       In some ways, this is all just another discussion about why the
>>>>>>       reported results of any stove testing need much explanation
>>>>>> (which
>>>>>>       is usually not provided) and why the results are so easy to
>>>>>> ignore
>>>>>>       as being poorly related to the realities of people and their
>>>>>> stoves
>>>>>>       and their fuels.
>>>>>>
>>>>>>
>>>>>>       I hope we can do better in the future.
>>>>>>
>>>>>>
>>>>>>       Paul
>>>>>>          (still another week to go on my vacation trip to Brazil,
>>>>>>       so I probably will not be sending replies.)
>>>>>>
>>>>>>       Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
>>>>>> Email:  psanders at ilstu.edu
>>>>>> Skype: paultlud      Phone: +1-309-452-7072
>>>>>> Website:  www.drtlud.com
>>>>>>
>>>>>>
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>>>>>>
>>>>>>
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>>>>
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>>>
>>> --
>>> Bjarne Laustsen
>>> Director
>>> Kiwia & Laustsen Limited
>>> P.O. Box 285
>>> Karatu, Tanzania
>>> phone +255 787295684
>>>
>>>
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>>
>
>
> --
> Bjarne Laustsen
> Director
> Kiwia & Laustsen Limited
> P.O. Box 285
> Karatu, Tanzania
> phone +255 787295684
>
>
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>


-- 
Nolbert Muhumuza

President & Chief Operations Officer
Awamu Biomass Energy Ltd.
P.O. Box 40127, Nakawa
Kampala - Uganda.

Mobile: +256-776-346724
Skype: nolbertm
www.awamu.ug




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