[Stoves] offlist reply from Paul

[ajheggie at gmail.com]

Please see below a small offlist discussion which I think was aimed at
[stoves]
. I found it interesting that kaolin (same as fullers earth  or bentonate
clay I suspect) modiies the combustion in this way.

Now to find a Vietnamese shipping company that can handle all the duies and
transport for dhipping Delivered Duty Paid.
Andrew

On Thu, 22 Dec 2022 at 00:20, Paul Olivier <paul.olivier at esrla.com> wrote:

> See comments below.
>
> On Thu, Dec 22, 2022 at 6:51 AM <ajheggie at gmail.com> wrote:
>
>> What appeals to me is that rice husk is an agri residue that performs
>> well with no special preparation, there are presumably other crop
>> hulls  or pips which are similar, olive or cherry pits or pistachio
>> nut hulls.
>>
>
> Here in Vietnam where I live, there is a lot of coffee husk that is
> uniform.
> But coffee husk contains a lot of oily compounds.
> When one gasifies coffee husk, a lot of black smoke is created, and the
> flame is yellow.
> However, when we mixed in about 2% kaolin and pelleted the coffee husk,
> the black smoke disappeared, and a beautiful blue flame was created.
> This opens the door to pelletizing pine forest debris.
> In the province where I live, there are 50,000 hectares of pine forests.
>
> Vietnam produces over 90 million tons of rice straw and over 8 million
> tons of rice hull.
> No one here should have to use fossil fuels, wood or charcoal to cook a
> meal.
> World-wide there are several billion tons of straw of various kinds that
> could be pelleted and used as gasifier fuel.
>
> I look forward to making briquettes as well as pellets.
>
>
>
> The height of the briquette can be adjusted to whatever gasifier run time
> is needed.
> A fan would not be needed when gasifying briquettes.
> The top of the briquette could be coated with a fire-starter material for
> easy lighting.
>
>
>> Twigs on the other hand would have to be harvested, dried and prepared
>> which may be costly in labour.
>>
>> When wood pellets got more expensive here in UK I sieved out wood
>> chips to give me the relatively small size class that my pellet burner
>> could feed, they were difficult to dry sufficiently and although
>> available free the effort wasn't worth it to me, also the burner was
>> derated by over 50% because the bulk density was so low. I took the
>> pellet burner out and reverted to a modern, clean burning 4kW log
>> stove. This can heat my small house comfortably down to 5C outside and
>> a little less well in the few days last week when it went to -5C.
>>
>> Paul has developed the gasifier for agricultural communities and it is
>> best suited there.
>>
>
> I suggest that it is suitable everywhere that high-grade heat and biochar
> are needed.
>
>>
>> Where I volunteer at a community interest woodland (mainly run for
>> educational purposes) there is a small commercial sawmill. The sawdust
>> has been allowed to build up to become a problem, it has also been
>> allowed to get rained on. If the gasifier could turn dry sawdust to
>> char it would be an interesting teaching aid on a number of counts:
>>
>> Utilising waste for heat/cooking
>> tidiness
>> Pyrolysis/gasification
>> Biochar for use in the nursery
>>
>
> Try not to let the sawdust get wet.
> If the sawdust contains oily compounds, add kaolin and pelletize.
>
>>
>> Best wishes for the season Paul and Ron and thanks for an interesting
>> topic back on [stoves]
>>
>
> Thanks so much.
>
>
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