[Stoves] Charcoal as space filler in TLUD reactors

Tue May 7 16:44:29 CDT 2013

Josh: 

I certainly want to be on your list of recipients, but think you should send to the whole list. 

I learned va googling that you will be experimenting with a "drupe". I want now to hear what happens with avocado pits. I think we need really big TLUDS to make them work. 

Others are plums,peaches,dates,mangoes and apricots. Mangos sound the most interesting of that list. None spheres, but also none are pencil-like. 

There are probably experts around for each who can give the packing fraction (or void space and average path length so as to predict a "superficial velocity". 

I hope all is gong well for you away from Colorado. You are needed here. 

Ron 

----- Original Message -----
From: "Josh Kearns" <yeah.yeah.right.on at gmail.com> 
To: "Discussion of biomass cooking stoves" <stoves at lists.bioenergylists.org> 
Sent: Tuesday, May 7, 2013 3:21:33 PM 
Subject: Re: [Stoves] Charcoal as space filler in TLUD reactors 

I just got a bunch of (spherical) cherry pits I'm going to try soon. Let me know if you are interested in the results.... 

On Tue, May 7, 2013 at 4:57 PM, < rongretlarson at comcast.net > wrote: 

Frank and list: 

Need to bring in one more variable: fuel shape. Imagine the fuel is pencil shaped. If placed vertically, they work fine to make char. If horizontal and parallel, they can block most vertical air flow. Anyone able to supply biomass fuel spheres? 

Ron 

From: "Frank Shields" < frank at compostlab.com > 
To: "Discussion of biomass cooking stoves" < stoves at lists.bioenergylists.org > 
Sent: Tuesday, May 7, 2013 2:46:13 PM 

Subject: Re: [Stoves] Charcoal as space filler in TLUD reactors 

Dear Martin, 

I often determine the particle density here in the lab using free flowing 
sand. If the particle density of the fuel is determined (g/cc) and you know 
the weight of fuel packed in a known volume you know the volume of voids and 
can determine the air speed - I am thinking. 

Frank 

-----Original Message----- 
From: Stoves [mailto: stoves-bounces at lists.bioenergylists.org ] On Behalf Of 
ajheggie at gmail.com 
Sent: Tuesday, May 07, 2013 1:26 PM 
To: Discussion of biomass cooking stoves 
Subject: Re: [Stoves] Charcoal as space filler in TLUD reactors 

[Default] On Tue, 7 May 2013 09:22:19 +0200,"Boll, Martin Dr." 
< boll.bn at t-online.de > wrote: 

>You have to calculate the free space in order to get the real air-speed in 
this area. 
>I think even if that is naturally not the true surface-speed on the fuel, 
it is a good number to deal with. 

I think in gasification they use the term "superficial velocity" a fictional 
speed derived from the air volume and cross section of the chamber, the 
actual speed of any given bit of air flow through the spaces will be much 
higher of course. 

AJH 

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-- 
Josh Kearns 
PhD Candidate, Environmental Engineering 
University of Colorado-Boulder 
Visiting Researcher, North Carolina State University 

Director of Science 
Aqueous Solutions 
www.aqsolutions.org 

Mobile: 720 989 3959 
Skype: joshkearns 

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