[Stoves] Rice husk briquettes in Vietnam was Re: Cuber and size of densifying machines
Ronal W. Larson
rongretlarson at comcast.net
Sat Mar 15 14:31:06 CDT 2014
Anh, list, et al:
1. Thanks for the new information on pellets in Viet Nam. It is good to hear the husks are now being put to use. The rating of 4100 kcal/kg is a bit more than 17 MJ/kg. What are typical wholesale and retail prices for these pellets/briquettes? Do the different shapes (and probably densities) have different prices?
2. I recommend your web site to others. You seem to have a nice product line. Glad to see the word “biochar” there. If you stop your pyrolysis at the right time, what maximum percentage char yield are you able to obtain? Is there a market for the char and if so at what price relative to the input fuel?
3. All of your 4 size stoves seemed to focus on wood. Can they work with pellets - and what operational cost difference would you expect? Do you expect most of your customers to get sticks and then stack vertically?
4. It seems like a good idea for you to allow a two day trial period. What percentage of those who take up that offer then buy? It is perhaps impolite to ask the prices of the four sizes, but if not, perhaps you could give those. Since we have all your dimensions, just knowing the ratio of prices for the four different models would be very interesting
5. The main difference I note over other TLUDs is that you seem to only have secondary air at the very top - and hence a very tall flame. Do you have any problem of soot buildup on the pots?
6. Another difference is having a square rather than cylindrical geometry. This probably has many manufacturing advantages, but possibly not on uniformity of pyrolysis. Does the char seem to be roughly the same in the corners as the center?
Thanks for doing what you are doing. Best of luck.
Ron
On Mar 15, 2014, at 11:26 AM, Anh Nguyen <ntanh at greengenvn.com> wrote:
> Dear Paul and all,
>
> Below are some links for what we have in Vietnam, sorry that they are in
> Vietnamese but you can see some machines and rice husk products
> http://mayepcuitrau.com/
> http://tmptrade.com/product.html?gclid=CPeW5YPylL0CFacF4goddiwA2Q
>
> I've just briefly visited Mekong delta last month and met several people in
> rice milling business to discover the chance to make rice husk briquette
> there and was very surprise too with the fact that I found. Mekong delta is
> the heart of Vietnamese rice production, there's a lot of rice mill there
> and all of them (as far as I know) already have a buyer for their rice
> husks. They often sign year long contract to buy all the rice husks, most
> for making briquettes/pellets, some for direct use (making bricks,...). In
> many area , people also use rice husk briquetted for daily cooking, most of
> them burn as normal wood in three stone stoves. Small rice mill there can
> handle 300-400 tons rice/day, producing 60-80 tons rice husks.
>
> In the north of Vietnam, due to small scale production of rice, we are
> running short of rice husk briquette now, all producers have no stock to
> sell even when the price already up by 50%. Most rice husk briquette
> producers in the north of VN have relatively small capacity 300-600
> tons/months due to the supplies of rice husks, supplying ability also depend
> a lot of harvest season.
>
> The largest importers are Japan and Korea. Largest local buyers are food
> processing and garment industry.
>
> For the ash from rice husk briquette, all manufacturers offer to buy back
> the ash from customers. Due to high silica content in the ash, it consider
> somehow toxic waste" but at the same time, some fertilizer and construction
> material need it for the use so its a win-win-win situation for everyone
> involved.
>
>
> As for equipments:
>
> The above briquette machines are local made, we have a few makers in
> Vietnam. You can find similar from China too. Machines need 3 phrase power,
> 7-15kw for 200kg-1ton/hr, price range is around 2000USD-5000USD.
>
> Pellets machines: ring die system from China cost ~40kUSD for 1-2ton/hr, but
> for export quality (need to deal/reduce silica first), there are some system
> from Euro installed in the region but I'm not sure about the brand and price
> (heard of 150k range). I will try to find more info on this.
>
> I also visited Henan, China last summer looking for briquette and pellets
> machines. There were some good machines there, some may work with grass or
> straw. I would be very happy to discuss further if anyone interested.
>
> As about myself, my background is business and I m running a small private
> start up in Hanoi. Our main focus is to utilize the agriculture residues
> (which e have million tons in Vietnam yearly) in a more useful way rather
> than burning as waste. Our current product is a ND TLUD which use wood +
> biomass, just started to make and sell for about 6 months with some positive
> feedback.
>
>
> Anh
>
> Anh Nguyen
> General Director
> Green Generation JSC
> 30A Tran Hung Dao St., Hanoi, Vietnam
> Tel + 84 91 242 6666
> Email: ntanh at greengenvn.com
> Website: www.greengenstove.com
>
>
>
>
>
>
>
> -----Original Message-----
> From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
> Paul Anderson
> Sent: 15 March, 2014 9:06 AM
> To: Discussion of biomass cooking stoves; Michael Shafer - Thailand; Kent
> Good - Cambodia; alexis belonio
> Subject: [Stoves] Rice husk briquettes in Vietnam was Re: Cuber and size of
> densifying machines
>
> Dear Anh,
>
> On behalf of many of us, I request that you send to us more information
> about the rice husk briquette processes and equipment and costs, etc
> that you mention are so well established in Vietnam. This is VERY
> important and is not well known to us. Maybe there are some reports you
> could send. Or you could ask others to assist to provide us with the
> information.
>
> Thank you in advance.
>
> And we are interested in getting to know your better, your employment,
> training, etc.
>
> 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 3/14/2014 9:20 AM, Tuan Anh wrote:
>> Robert and Richard,
>>
>> Vietnam used to have problem with excess rice husks at mills too, but now
> they all make rice husk briquette, pellets so it turn from waste to tradable
> goods. We have many rice husk pellets makers here for both domestic and
> export.
>>
>> As far as I know, dealing with high abarisve silica in rice husk require a
> much more expensive equipment. Low cost rice husk briquette machines can
> serve well for simple tasks such as daily cooking or simple
> commercial/industrial production.
>>
>> Anh
>>
>>
>>
>>
>>
>> On Mar 14, 2014 8:32 PM, Richard Stanley <rstanley at legacyfound.org> wrote:
>>> Robert
>>>
>>> We have seen the same experience described by many in the wet processing
> of briquettes, but with the wet process, it was about abrasion to the
> blenders and molders hands, as it is very much a hands-on process.
>>> However we found a different way to handle them for our needs-- at least
> in Mbale Uganda in 2007.
>>>
>>> In Mbale, rice husks were piled several meters high and spread out over
> 100 meter wide mounds all from the local rice mill.
>>> With the rains, these mounds would begin to decompose --more like decay--
> from within, leaving large voids beneath --and invisible on-- the surface.
> Many children playing on them were reported to have fallen in and been
> badly burned . We were glad to discover that this glutinous mass was an
> excellent binder and in-filler for the wet process briquettes The abrasive
> properties of the original husk were abated in the decay process as well.
> Rice husk blended briquettes were one variety of briquettes being made by
> the Uganda United Womens Association- Joint.
>>>
>>> The UUWA-J is headed by Vicky Akello. She and her team are really
>>> great trainers by the way and have trained all over Uganda and
>>> western Kenya ever since we first met in 2008. A contact for Vicky is
>>> : Akello victoria <uuwaj at yahoo.com>
>>>
>>> Richard
>>>
>>>
>>>
>>> On Mar 6, 2014, at 11:28 PM, robdeutsch44 wrote:
>>>
>>> Rice hulls are a very difficult material to pelletize with because of
>>> the high silica content makes it very abrasive on the dies and moving
> parts.
>>> Better to use rice hulls at point of generation (the rice mill) and
>>> use bulk gasifier.... Just my two cents :-)
>>>
>>> Robert in Cambodia
>>>
>>>
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