[Stoves] gasifying sawdust

[Ronal W. Larson]

Rob and list:

	Sounds like an important advance.  Congratulations

	I’ll bet most on the list would like to see your pictures.

	What weight of sawdust?   The fuel bed height?  Times for the pyrolysis front to reach the bottom and for total combustion?   Have to change to lots more “primary” after you had made the char?  Can you guesstimate the several butterfly ratio settings?  Power for the fan/blower?  Might you have been able to save the sawdust char if the  4 m3 wood was dry?  Any way to describe cleanness of the burns?

Ron


On May 22, 2015, at 6:06 PM, Robert Lerner <bajarob at gmail.com> wrote:

> We built a big (1M dia.) fan-forced sawdust TLUD gasifier in Costa Rica, designed by Nikolaus Foidl.
> 
> Used one blower with two butterfly valves—one to balance primary:secondary air ratio, and the other to adjust total airflow. 
> 
> Worked great, though we combusted the char too, because were using the TLUD to dry & prime a 4M³ retort kiln filled with high MC wood. I have pictures.
> 
> Rob Lerner
> ~~~~~~~~~~~~~~~~~~~~~~~
> Robert A. Lerner
> Mexico cell: 415-101-4591
> U.S. direct: 619-618-1248
> Skype ID: bajarob
> Rob's Biochar TED talk
> Board member CATIS-Mexico
> ~~~~~~~~~~~~~~~~~~~~~~~
> 
>> On May 22, 2015, at 12:00 PM, stoves-request at lists.bioenergylists.org wrote:
>> 
>> Message: 1
>> Date: Thu, 21 May 2015 11:11:33 -0700
>> From: Tom Reed <tombreed2010 at gmail.com>
>> To: "stoves at lists.bioenergylists.org"
>> 	<stoves at lists.bioenergylists.org>
>> Subject: [Stoves] Sawdust Gasification
>> Message-ID: <3B3D1B5B-91C0-408B-8FBE-38ADAE3896A2 at gmail.com>
>> Content-Type: text/plain;	charset=us-ascii
>> 
>> Dear List
>> 
>> One of the benefits of the TLUD stove working on wood chips is that it produces 20% charcoal, which can be sequestered, removing 38 tons of CO2 from circulation for each           ton of wood gasified (20% due to formation of charcoal from the lignin and using the gas from the cellulose (renewable) in place of propane, natural gas of coal gas.  
>> 
>> If we could gasify sawdust, it would bring another, typically dry, source of fuel into the picture.  However, the particle size of sawdust does not permit TLUD operation.  Does anyone have a suggestion of how to gasify sawdust?
>> 
>> TOM REED 
>> 
>> Thomas B Reed 
>> 280 Hardwick Rd
>> Barre, MA 01005
>> 508 353 7841
> 
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