[Stoves] Rice husk stove and rice husk gasifier ON THE SIDE

Christopher Bradnum Christopher.Bradnum at nottingham.ac.uk
Mon Oct 17 09:14:25 CDT 2016


Dear Crispin

Thank you for your kind offer, I will certainly take you up on this.
I will contact you off list to discuss details.

Thanks again,

Chris

-----Original Message-----
From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Crispin Pemberton-Pigott
Sent: 14 October 2016 15:36
To: Christopher Bradnum <stoves at lists.bioenergylists.org>
Subject: Re: [Stoves] Rice husk stove and rice husk gasifier ON THE SIDE

Dear Chris

I am willing to advise from a distance if you and she find the arrangement suitable.

There are a couple of approaches but the Mayon Turbo Stove shows that it need not be a batch stove. This item is really under-appreciated because it doesn't fit either the Rocket Stove mentality and is not a TLUD gasifier, which are the two main products bandied about.

Rice hull gasification can be done with and without making char. I have seen that during my work on the Mayon Turbo improvement work.

I have photos of that, but it was done while confined to retaining the basic design Roger Samson produced in the Philippines.

I am working a lot these days with hopper-filled cross draft stoves and they have a lot of merit. The MTS I guess I can call Roger's stove is a hopper stove that requires occasional attention, it won't burn for five hours.

The existing designs from Olivier in Vietnam and the work on which it is based are not really taking off I think in part because people don't want to burn 'batches'. Maybe they do and I can't detect it. Anyway I am willing to advise her if she wants.

I am presently a visiting prof at the college of engineering at China Agricultural University, Beijing and am advising grad students, co-supervising some. We have a spectacular lab these days based on the SeTAR Centre. I was there a couple of weeks ago testing a Chinese made copy of the Tajikistan Model 4 coal gasifier. The background air was 235 micrograms per cubic metre and in the stack it was 21 meaning it produced zero PM2.5 and was stripping 90% of the ambient PM out of the air while burning bituminous Shanxi coal. Something like Witbank 2.

In principle it could be made to burn rice hull and that would be an interesting experiment. Maybe that will be a better option as it will burn for ages unattended.

What do you think?

I am in Kyrgyzstan this coming week testing copies of the stoves I put up on my website for here and Tajikistan. You can see them at

Www.newdawnengineering.com then /library /stoves /Kyrgyzstan

Best regards
Crispin

C Pemberton-Pigott
International Technical Consultant
World Bank CSI Projects in Indonesia, China, Kg and TJ Crispinpigott at outlook.com

  Original Message
From: Christopher Bradnum
Sent: Friday, October 14, 2016 18:07
To: Discussion of biomass cooking stoves Reply To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] Rice husk stove and rice husk gasifier


Dear List Member

I am looking for some help on a project one of my students is starting.

I have a Taiwanese student who would like to develop a passive (not electric fan) rice husk stove for her home as her major project for the BEng in Mechanical Engineering at the University of Nottingham. Depending on the success of the project, her family may consider starting a business manufacturing such stoves within their community. Her family own a rice farm and they have a lot of material that they can convert into energy. They already have a stove (sorry I don't have the photographs of this) which they use for some of their cooking needs. It has a deep central 'pot like' component (+/- 750mm tall X 300mm diameter) with a grid at its base which holds the burning rice husk. This 'pot' is located inside a larger vessel. At the base a fan directs air in below the central rice burning 'pot'. A separate pot holder unit is placed on top of the whole configuration. This has, what looks like, an inverted colander at its centre through which the flame reaches the cooking pot. Th  e stove complete is around 1,000mm tall. The rice husk is top lit inside the central pot and I assume the air pushed in from underneath helps to fuel the fire. The stove produces a reddish / purple flame and I am told a pot filled with fuel lasts for 5 hours. Although I can't quite work out what needs to be cooked for that long.
The student returns home in December and will complete some rudimentary tests to get a baseline for the efficiency and emissions given off by the stove. I will also get her to complete the heterogeneous cooking test developed by SeTAR under Prof Harold Annegarn and Crispin Pemberton-Piggots' supervision at the University of Johannesburg.
Leading up to that testing I want her to get on with a bit of research, so I thought to turn to this very excellent group and ask for some help (standing on the shoulders of giants...).
Has anyone on the list worked with rice husk as a fuel source and does anyone have any research work we can look at as a starting point? Particularly using rice husks as a fuel for cooking.

It seems to me, through superficial online perusing, that a rice husk gasifier might be a better utilisation of the raw material. If it is a good system to convert rice husk into energy I would like to make and test one of these too. Does anyone have research around rice husk gasifiers that I could start investigating? Is this a good or not so good use of the fuel?

Kind regards

Chris





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This message and any attachment are intended solely for the addressee
and may contain confidential information. If you have received this
message in error, please send it back to me, and immediately delete it. 

Please do not use, copy or disclose the information contained in this
message or in any attachment.  Any views or opinions expressed by the
author of this email do not necessarily reflect the views of the
University of Nottingham.

This message has been checked for viruses but the contents of an
attachment may still contain software viruses which could damage your
computer system, you are advised to perform your own checks. Email
communications with the University of Nottingham may be monitored as
permitted by UK legislation.





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