[Stoves] Rice hull gasifier milling rice

[Crispin Pemberton-Pigott]

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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