[Stoves] Rice hull gasifier milling rice

Fri Nov 2 00:01:31 CDT 2012

This thing runs long hours. They mill until 10 PM each night. 
-----Original Message-----
From: "Tom Miles" <tmiles at trmiles.com>
Date: Thu, 1 Nov 2012 21:36:28 
To: <crispinpigott at gmail.com>; 'Discussion of biomass cooking stoves'<stoves at lists.bioenergylists.org>
Subject: RE: [Stoves] Rice hull gasifier milling rice

It's nice to hear about a gasifier that is apparently doing useful work and
running smoothly. Most of what we hear about are either gasifiers by NGOs
that don't work, or cheap knockoffs of Indian and Chinese gasifiers that are
causing serious health problems through toxic wastewater discharge. 

Tom

-----Original Message-----
From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
Crispin Pemberton-Pigott
Sent: Thursday, November 01, 2012 9:31 PM
To: Stoves
Subject: Re: [Stoves] Rice hull gasifier milling rice

Will do. My son Jeremy got some nice photos as well. The thing I liked is
that the gas plant looks quite modern. 

It has a series of squat tanks with manometers on the side which I presume
are filled with water and the gas is bubbled through them sequentially. Yes?

I met one of the partners last night and he told me the engine was 135 KW.
Their charge per ton is amazingly low - about $60 for clean unpolished rice.
This is no doubt reflecting the fact they don't pay much for motive power. 

I have also seen several engine and cattle drawn stove vending 'trucks'
absolutely loaded with stoves. There are perhaps 6 types available for
charcoal and wood. The $4 stove lasts about 9 months and the $10 about 2
years. There are different sizes but the upper limit is not so big. Above
they use fixed stoves. Pots run up to 80-100 litres. 

Last night I made and demonstrated an ingiting cone as discussed previously
here. The demonstration of low smoke ignition and the ability to burn very
small amounts at a high heat has already sparked discussion of how to
introduce this in the form of a permanent feature of the stove. 

All the charcoal stoves are metal-clad terracotta. No one seems to be
processing the char fines into briquettes. Lots of room for improvement. 

Regards
Crispin
-----Original Message-----
From: "Tom Miles" <tmiles at trmiles.com>
Date: Thu, 1 Nov 2012 20:52:54 
To: <crispinpigott at gmail.com>; 'Discussion of biomass cooking
stoves'<stoves at lists.bioenergylists.org>
Subject: RE: [Stoves] Rice hull gasifier milling rice

Crispin,

Please send photos and we'll put them on the website. I'd love to see them.
I haven't heard of a rice mill powered with a gasifier since a Chinese
gasifier was used in Mali for several years. 

Many thanks

Tom

-----Original Message-----
From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
Crispin Pemberton-Pigott
Sent: Thursday, November 01, 2012 8:26 PM
To: Stoves
Subject: [Stoves] Rice hull gasifier milling rice

Dear Gasifying Friends

I just stopped at a rice milling plant that is about 20 km outside
Battambang. It processes about 1.9 tons per hour. It is all flat belt driven
and a lot of it is made of wood. 

The power plant is an internal combustion engine of about 200 HP. It runs on
gas. The gas is supplied by a rice hull gasifier at the back of the building
where there is literally a mountain of rice hull. 

The gasifier looks quite modern and operates in a way that is day-and-night
continuous. The rice hull is fed into the vertical reactor by an auger. The
reaction zone position is not exactly constant but is maintained within
certain limits. 

The ash/char is dropped off the top into a shallow pond to quench it. 

I see no reason why a small stove could not be operated in the same manner:
TLUD with episodic feeding from below via a plunger of some sort. Rice hull
flows easily. If the primary air control is adequate a range of 1 to 4 kW
would be perfect. 

If anyone is interested I took pictures of the whole gas system and power
plant. 

Regards
Crispin at km post 271 outside Battambang 
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