[Stoves] Misuderstanding of TLUD stoves Re: Refuelable TLUD Coal Stove developed in Mongolia that is not a batch process.

[Kevin]

Dear Paul

----- Original Message ----- 
From: "Paul S. Anderson" <psanders at ilstu.edu>
To: "Discussion of biomass cooking stoves" 
<stoves at lists.bioenergylists.org>; "Crispin Pemberton-Pigott" 
<crispinpigott at gmail.com>
Cc: "Hugh McLaughlin" <wastemin1 at verizon.net>; "'Discussion of biomass 
cooking stoves'" <stoves at lists.bioenergylists.org>
Sent: Sunday, March 06, 2011 12:43 AM
Subject: Re: [Stoves] Misuderstanding of TLUD stoves Re: Refuelable TLUD 
Coal Stove developed in Mongolia that is not a batch process.


> Go to the bottom of Crispin's message for my reply.

...del...

>
> Crispin.  Correct.  The Chip Energy Biomass Furnace is NOT a TLUD.   That 
> is what I have said.

# OK... would you agree that a "FURNACE" is a device whose purpose is to 
burn a fuel to release heat? If so, do you have data for the combustion 
efficiency? More specifically:
1: What percentage of the energy in the incoming fuel leaves with the flue 
gases as unburned combustibles?
2: What percentage of the energy in the incoming fuel leaves with the ash as 
a "char loss?"
>
> Concerning your other comments, the problem is that the term  "downdraft" 
> is being used as the SINGLE descriptor of several  strikingly different 
> types of gasifiers.

# OK, but if we are talking about a FURNACE, whose purpose is generation of 
heat from fuel, a GASIFIER is a very poor furnace, in that much of the fuel 
energy leaves the system as chemical energy.

 I have used the term "true"
> when maybe I should have said "traditional, as seen in the textbooks 
> descriptions."  OTHER modifier words would be useful to describe the 
> different variations of downdraft devices with which you are working. 
> But you need to do that, not me.  You need to be clear about what 
> variation of downdraft gasifier you are referring.

# I am not at all clear whether the Chip Energy Furnace is a FURNACE, a 
GASIFIER, or a PYROLYSER. The Brochure at:
http://www.chipenergy.com/brochurefurnace.htm seems to suggest that there 
would be a significant percentage of  unburned fuel leaving the system as 
char. That would give a very low furnace efficiency. It would appear to be 
more of a "continuous feed Bottom Lit Up Draft pyrolyser. having a close 
coupled pyrolysis gas burner with heat recovery." However, if the "smoke 
eater" was removed, then the pyrolysis gases could be used elsewhere as a 
fuel gas, and the system, as an air blown pyrolyser,  would then be a char 
producing gasifier. If we define the Chip Energy Biomass Furnace by the job 
it does best, what would you say is the "job that the Chip Energy Biomass 
Furnace" does best?
>
> And I will try to do likewise.

# Thanks!

Best wishes,

Kevin
>
> Paul
>>
>> Interesting.
>>
>> Regards
>> Crispin
>>
>>
>>
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