[Stoves] wheat husk pellets

Tue Jun 11 07:25:31 CDT 2013

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 <mailto:paul.olivier at esrla.com>  

To: Discussion of biomass cooking stoves
<mailto: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 <mailto:paul.olivier at esrla.com>  

To: Discussion of biomass cooking stoves
<mailto: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/DrawingsUl
tra/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/ 

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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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