[Stoves] wheat husk pellets

Tue Jun 11 20:54:01 CDT 2013

Tom,
.
Coffee husk are a bit soft and oily, and I venture to guess that they will
provide lubrication, if added to the rice hulls.
The best fuel I have seen so far is a mixture of rice hulls and coffee
husks, 50%-50% by volume.
We have both coffee husks and rice hulls in Lam Dong province.

Thanks.
Paul

On Wed, Jun 12, 2013 at 8:25 AM, Tom Miles <tmiles at trmiles.com> wrote:

> Rice husks are a challenge for densifying. They are famously abrasive due
> to the very high silica content. It helps if you have a wet fibrous
> material that can knit the husks together. Something like shredded
> eucalyptus bark or a bagasse can work but it takes power to do the
> shredding.  ****
>
> ** **
>
> *From:* Stoves [mailto:stoves-bounces at lists.bioenergylists.org] *On
> Behalf Of *Paul Olivier
> *Sent:* Tuesday, June 11, 2013 4:21 PM
>
> *To:* Discussion of biomass cooking stoves
> *Subject:* Re: [Stoves] wheat husk pellets****
>
> ** **
>
> Tom,****
>
> Can you send more information on these "meat-grinder" pellet machines?****
>
> But I am a bit worried that such pellet machines will not achieve complete
> binding.****
>
> Here in Vietnam there are a lot of pellet machines in operation,
> especially on rice hulls.****
>
> Nothing has to be invented. It's simply a question of getting pellet
> machines out there.****
>
> For example, in Lam Dong province where I live no one is making pellets.**
> **
>
> This I hope to correct real soon.****
>
> Paul****
>
> ** **
>
> On Tue, Jun 11, 2013 at 7:25 PM, Tom Miles <tmiles at trmiles.com> wrote:****
>
> The world is full of failed densification systems. You don’t have to go
> all the way to a high density (35 lb/ft3) fuel pellet. Put the crumbled
> cake through a meat grinder with a large sieve and dry out the pellets.
> Make’s a great fuel. $1,000 from Cabela’s. It’s a mini version of Richard’s
> press. There are Chinese versions of course. ****
>
>  ****
>
> Tom****
>
>  ****
>
> *From:* Stoves [mailto:stoves-bounces at lists.bioenergylists.org] *On
> Behalf Of *mtrevor
> *Sent:* Tuesday, June 11, 2013 4:25 AM****
>
>
> *To:* Discussion of biomass cooking stoves****
>
> *Subject:* Re: [Stoves] wheat husk pellets****
>
>  ****
>
> I absolutely agree with you right down the line, however I am generally
> the odd man out.****
>
>  ****
>
> The only pelleting machine they had here was in the copra mill for the
> cake. ****
>
> It was phased out years ago Now they just move bulk crumble. Even though
> you do not approve****
>
> the crumbled cake burned nicely in my XL woodgas stove. ****
>
>  ****
>
> There is no coir dust as the is no industrial processing of husks. Beside
> the husks are spread ove an area ****
>
> maybe 1/3 of the entire United States****
>
>  ****
>
> there is a very small scale briquetting operation based on one of Richard
> Stanley's ****
>
> lever press and scrap paper at the local waste company. Effective
> processing of biomass waste would be important ****
>
> but its limited diffuse distributed nature makes this nearly impossible. *
> ***
>
>  ****
>
> There are some real challenges involved here.****
>
>  ****
>
> Michael N Trevor. ****
>
>  ****
>
> .  ****
>
> ----- Original Message ----- ****
>
> *From:* Paul Olivier <paul.olivier at esrla.com> ****
>
> *To:* Discussion of biomass cooking stoves<stoves at lists.bioenergylists.org>
> ****
>
> *Sent:* Tuesday, June 11, 2013 8:29 PM****
>
> *Subject:* Re: [Stoves] wheat husk pellets****
>
>  ****
>
> Michael,****
>
> Can you access pellets in the Marshal Islands?****
>
> Do you have coconut dust in the Marshal Islands?****
>
> Coconut dust is in an ideal powder form for pelletizing,****
>
>  and it contains a lot of lignin that should serve as a natural binder.***
> *
>
> I would urge funding agencies to get involved in the finance of pellet
> machines throughout the world.****
>
>  ****
>
> Funding agencies should also be investing heavily in biochar research.****
>
> When farmers understand the value of biochar, it will acquire value.
> Its sale will cover the cost of making pellets.****
>
>  ****
>
> Once again, fuel preparation is critical.
> Imagine where the coal industry would be without coal preparation.****
>
> There are a lot of bad fuels out there, such as coconut dust, that need to
> be prepared.****
>
>  ****
>
> Paul****
>
>  ****
>
> On Tue, Jun 11, 2013 at 2:44 PM, mtrevor <mtrevor at ntamar.net> wrote:****
>
> Dear Paul ****
>
> If you start making this unit please advise.****
>
> Thank you****
>
>  ****
>
> Michael N Trevor****
>
> Majuro ****
>
> Marshall islands ****
>
> .****
>
> n****
>
> ----- Original Message ----- ****
>
> *From:* Paul Olivier <paul.olivier at esrla.com> ****
>
> *To:* Discussion of biomass cooking stoves<stoves at lists.bioenergylists.org>
> ****
>
> *Sent:* Tuesday, June 11, 2013 6:54 PM****
>
> *Subject:* Re: [Stoves] wheat husk pellets****
>
>  ****
>
> In my previous email I concluded by saying:
> *What's needed above all else, in my opinion, are small, beautiful TLUD's
> that make use of pellets. Such units could be situated in modern kitchens
> throughout the world. Once these units are in place, the rest will follow.
> *****
>
>
> It seems that Home Depot, Wal-mart, Lowes, Ace, Agway and many others
> large retailers in the USA all carry wood pellets. Why can we not make
> TLUDs that make use of these pellets as fuel? The only thing that changes
> is the height of the reactor: it's much less than the height of a reactor
> that uses undensified biomass. This means that the TLUD is small,
> lightweight, mobile and much cheaper.
>
> Here is an example of what I am talking about:
>
> https://dl.dropboxusercontent.com/u/22013094/150%20Gasifier/Short/DrawingsUltra/001.pdf
> The total height of the reactor is less than 10 inches.****
>
> This reactor holds about 2 kgs of pellets.****
>
> This gives a burn time of about one and a half hours.****
>
> The reactor itself in 304 stainless steel weighs less than 1.5 kgs.****
>
>  ****
>
> We've already tested taller TLUDs on rice hull pellets,****
>
>  and they emit the same beautiful blue flame as when loose rice hulls are
> used.****
>
> Another big advantage of pellets is that there is much less particulate
> matter emissions compared to loose rice hulls.****
>
> Loose rice hulls are dusty, messy, bulky and a real nuisance to store and
> load.****
>
> In an urban setting it makes no sense to be hauling in loose rice hulls of
> a bulk density of only 80 kg/m3.****
>
> If we're going to compete with fossil fuel gas, we've must reach a certain
> level of convenience and ease of use.****
>
>  ****
>
> Thanks.****
>
> Paul****
>
>  ****
>
>  ****
>
> On Tue, Jun 11, 2013 at 6:11 AM, Paul Olivier <paul.olivier at esrla.com>
> wrote:****
>
> See comments below.****
>
>  ****
>
> On Mon, Jun 10, 2013 at 7:01 PM, Crispin Pemberton-Pigott <
> crispinpigott at gmail.com> wrote:****
>
> Dear Paul O
>
> The reason is economics.****
>
>  ****
>
> In may cases transport distances are short, and the economics are quite
> good, and yet we complacently continue to burn fossil fuels. I lived for
> over 20 years in West Flanders in Belgium where wheat fields encroached
> upon densely populated rural areas, and yet everyone merrily burned LPG gas
> to cook a meal. Later I move to Waxahachie, Texas, a small town near
> Dallas, and once again, wheat fields were everywhere. Yet no one dreamed of
> making wheat husk or wheat straw pellets and using them to make syngas to
> cook a meal.****
>
>  ****
>
>
> China is showing at the moment that the maximum radius that is viable to
> transport pellets/briquettes is 150 km.****
>
>  ****
>
> China appears to be struggling with a lack of infrastructure in getting
> pellets to market. How does one explain the economics of shipping coffee
> husk pellets from Brazil to Holland as we see in this link?
> http://www.coffeehabitat.com/2007/10/coffee-husks-as/ This is a
> thoroughly bold undertaking, but does it make sense to transport coffee
> husk pellets half way around the world to provide fuel for Dutch power
> stations? Why not make use of these pellets in Brazil? Also, one might
> argue that the highest and best use of coffee husk pellets would be, not to
> burn them in huge power stations, but to generate from them a syngas that
> would replace bottled gas or other forms of fossil fuel gas. The biochar
> left over from these stoves would then be returned to the soil.****
>
>  ****
>
>
> $76 a ton is cheap by Canadian standards but far higher than the price of
> coal per delivered MJ.****
>
>  ****
>
> Not always so. Vietnamese coal coming from the north costs more per
> delivered MJ than rice hulls pellets. ****
>
> In Vietnam there is a huge multi-billion dollar infrastructure that
> underlies the mining, preparation and transportation of coal.****
>
> This infrastructure does not yet exist for waste biomass pellets.****
>
>  ****
>
>  ****
>
>
> Agri-waste pellets are a nice fuel provided they have been prepared
> properly.****
>
>  ****
>
> The same applies to coal and all other fossil fuels.****
>
> Coal preparation is a gigantic and complex undertaking.****
>
>
>  ****
>
>
> If the value of char is 'always there' it is quite possible the economic
> equation will change with the introduction of gasifiers, however the same
> energy production rate will increase the demand for transport and raw husk
> supply.****
>
>  ****
>
> Yes, you are right. The introduction of pellet gasifiers in a given area
> will create a demand for pellets, and the demand for pellets will stimulate
> the construction of the infrastructure needed to meet this demand.****
>
>
> You know all this. How about giving us an equation or spreadsheet that
> includes the whole value chain?****
>
>  ****
>
>
> Stovers could plug in their local costs and make a comparison between
> options. In at least *some *circumstances the gasification route would be
> the most viable.****
>
>  ****
>
> Instead of using the word "some". I would prefer to say "many".****
>
>  ****
>
>
> The UK buys wood pellets from Canada to burn in power stations, but that
> is subsidized by pensions grannies and the working poor.****
>
>  ****
>
> Once again, why haul pellets from Canada to the UK? Does the UK not have
> an abundance of agricultural waste? And once again, should we not focus
> more on producing syngas from pellets and directly using this syngas to
> cook a meal? Burning pellets to make electricity is surely not the wisest
> way to proceed, especially if this electricity is used as a source of
> energy to cook a meal. Why not bypass the power station altogether?****
>
> What's needed above all else, in my opinion, are small, beautiful TLUD's
> that make use of pellets. Such units could be situated in modern kitchens
> throughout the world. Once these units are in place, the rest will follow.
> ****
>
>  ****
>
>
> Regards
> Crispin
> >From BB9900****
>
>
> -----Original Message-----
> From: Paul Olivier <paul.olivier at esrla.com>
> Sender: "Stoves" <stoves-bounces at lists.bioenergylists.org>
> Date: Mon, 10 Jun 2013 15:19:20****
>
> To: Discussion of biomass cooking stoves<stoves at lists.bioenergylists.org>
> Reply-To: Discussion of biomass cooking stoves
>         <stoves at lists.bioenergylists.org>
> Subject: [Stoves] wheat husk pellets****
>
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>
> --
> Paul A. Olivier PhD
> 26/5 Phu Dong Thien Vuong
> Dalat
> Vietnam
>
> Louisiana telephone: 1-337-447-4124 (rings Vietnam)
> Mobile: 090-694-1573 (in Vietnam)
> Skype address: Xpolivier
> http://www.esrla.com/ ****
>
>
>
>
> --
> Paul A. Olivier PhD
> 26/5 Phu Dong Thien Vuong
> Dalat
> Vietnam
>
> Louisiana telephone: 1-337-447-4124 (rings Vietnam)
> Mobile: 090-694-1573 (in Vietnam)
> Skype address: Xpolivier
> http://www.esrla.com/ ****
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> --
> Paul A. Olivier PhD
> 26/5 Phu Dong Thien Vuong
> Dalat
> Vietnam
>
> Louisiana telephone: 1-337-447-4124 (rings Vietnam)
> Mobile: 090-694-1573 (in Vietnam)
> Skype address: Xpolivier
> http://www.esrla.com/ ****
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>
> --
> Paul A. Olivier PhD
> 26/5 Phu Dong Thien Vuong
> Dalat
> Vietnam
>
> Louisiana telephone: 1-337-447-4124 (rings Vietnam)
> Mobile: 090-694-1573 (in Vietnam)
> Skype address: Xpolivier
> http://www.esrla.com/ ****
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-- 
Paul A. Olivier PhD
26/5 Phu Dong Thien Vuong
Dalat
Vietnam

Louisiana telephone: 1-337-447-4124 (rings Vietnam)
Mobile: 090-694-1573 (in Vietnam)
Skype address: Xpolivier
http://www.esrla.com/
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