[Gasification] [Stoves] Heating/thermal usage - China workshopnotes

[psanders at ilstu.edu]

David and all,

After a preliminary reading of the website, I comment:

1.  They say "syngas", but isn't that when only oxygen is used?  If they keep
their operating costs low and are not looking for real high temperatures (to
avoid clinker creation), they probably run mostly with air, and that would
yield "producer gas" with the high percentage of N2 nitrogen in the 
flue gases.

2.  Being basically an up-draft gasifier, we expect "char-making inside the
gasifier and tar-burning in the flue gases".  Close-coupled combustion 
would be
quite important, and it is highly unlikely that this unit could yield 
gases for
operating IC engines.

3.  I was wondering about the size of the unit.  A click on the "Product
Development and Test Plant" button shows a unit 2 storeys high.  This is a big
plant, and is probably not "down-size-able" to serve the needs of 
cookstoves or
even institutional cookers.

I like it and I am sure it has a niche, even a large niche.  But not with
cooking.

Paul

Quoting David Fulford <d.j.fulford at reading.ac.uk>:

> Ken and others,
>
> Ken, you have just almost described the technology about which Roger 
> Samson was asking on the gasification list; the Nexterra gasifier: 
> http://www.nexterra.ca/technology/index.cfm
>
> It is an updraft gasifier that keeps a fixed level of fuel above the 
> combustion zone. It claims to produce clean gas, but only suggests 
> that it is used for heating, not for running engines, so I am not 
> sure about the claim.
>
> David
>
> At 23:07 06/08/2006 +0100, Ken Boak wrote:
>> Kevin & List,
>>
>> It's quite simple (easier said than done perhaps) , you have to provide a
>> mechanical means that replenishes the fuel from the underneath or side at a
>> rate that matches the burn down rate.
>>
>> Think of it like a rocket stove but with an auger that feeds the fuel in
>> from the side, such that the combustion and pyrolysis zones remain almost
>> stationary towards the top of the gasifier.
>>
>>
>> Ken


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