[Stoves] Wood fired, two-stage gasification employed

Thu Aug 4 11:53:21 CDT 2011

Dear Crispin,

The CO measurements are 'normalized' to O2 values? Really? What's wrong with
people. : )   That means all CO measurements reported are meaningless if
some unknown number of them are based on O2 concentration without giving the
factor used.    

You mention 7% and 11%. Are these common factors used? Or just numbers? And
can you give an example as to how the calculations might be reported based
on the O2 values?  Are they calculated per O2 directly from a combustion
analyzer or re-calculated using O2 and CO2 values from the analyzer. Wonder
if we have any control over the calculations when using combustion
analyzers. 

Thanks
Frank

Frank Shields
Control Laboratories, Inc.
42 Hangar Way
Watsonville, CA  95076
(831) 724-5422 tel
(831) 724-3188 fax
frank at compostlab.com
www.compostlab.com

-----Original Message-----
From: stoves-bounces at lists.bioenergylists.org
[mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Ronald
Hongsermeier
Sent: Thursday, August 04, 2011 1:25 AM
To: Discussion of biomass cooking stoves; crispinpigott at gmail.com
Subject: Re: [Stoves] Wood fired, two-stage gasification employed

Dear Crispin,
I'll try to find out.
regards,
Ron

-----Ursprüngliche Nachricht-----
Von: "Crispin Pemberton-Pigott" <crispinpigott at gmail.com>
Gesendet: Aug 4, 2011 4:53:40 AM
An: "Discussion of biomass cooking stoves" <stoves at lists.bioenergylists.org>
Betreff: Re: [Stoves] Wood fired, two-stage gasification employed

>Dear Robert and anyone who can help:
>
>The emissions are given per cubic metre. It is likely that the flue gas
measurements are normalised to a certain oxygen level, for example 7% or
11%. Does anyone know what the O2 level is when reporting the CO limit, for
example?
>
>The number is not meaningful unless the dilution value is known. Because of
the confusion created by having in Europe a different dilution factor for
each fuel I advocate that all emissions be calculated at 0% O2 (no dilution
at all) because a) it is easy to calculate and b) everything is directly
comparable (different fuels and stoves).
>Whatever the dilution factor is the corrected emission numbers is per M^3
seem pretty high.
>
>Interesting.
>
>Regards
>Crispin
>-----Original Message-----
>From: "Robert Taylor" <rt at ms1.hinet.net>
>Sender: stoves-bounces at lists.bioenergylists.org
>Date: Thu, 4 Aug 2011 07:49:07
>To: Discussion of biomass cooking stoves<stoves at lists.bioenergylists.org>
>Reply-To: Discussion of biomass cooking stoves
> <stoves at lists.bioenergylists.org>
>Subject: Re: [Stoves] Wood fired, two-stage gasification employed
>
>Here's a rough and ready translation of the German in the two pages that
>Martin links to:
>
>Umwelttechnik:
>
>
>
>Environmental technology
>
>
>
>To reduce environmental loads, the legal limits on CO and fine particulate
>emissions have been redefined. The planned limits are:
>
>
>
>Fine particulates:
>
>Legal limit from 2008: 100 mg/m3; from 2015: 40 mg/m3
>
>xeoos Twinfire emissions, 2008: 22 mg/m3
>
>
>
>Carbon monoxide:
>
>Legal limit from 2008: 2000 mg/m3; from 2015: 1250 mg/m3
>
>xeoos Twinfire emissions, 2008: 625 mg/m3
>
>
>
>
>
>The xeoos, with its patented combustion process, not only meets these
>values, but goes far below them, even at partial or minimum loads. This is
>achieved by:
>
>
>
>- Burning exhaust gases at 1000-1200 deg C
>
>- 180-degree inertial separation of suspended particulates from exhaust
>gases in lower combustion chamber
>
>- intelligent air routing inside stove leads to maximum heat transfer into
>room
>
>
>
>
>
>Brenntechnik:
>
>
>
>Combustion technology
>
>
>
>In the xeoos Twinfire combustion process, the exhaust gases created by the
>burning of wood in the upper combustion chamber undergo an afterburn at
>temperatures of 1000-1200 deg C and are thus converted into additional heat
>and energy. In this way the xeoos achieves:
>
>
>
>- efficiency of over 90% throughout the burn period
>
>- up to 40% less ash generation for the same heat output, compared to a
>xeoos fireplace stove not operating in twinfire mode
>
>- up to 40% lower fuel consumption for the same heat output, compared to a
>xeoos fireplace stove not operating in twinfire mode
>
>- extremely low proportion of fine particulates, and very low proportion of
>CO, in exhaust gases
>
>- consistently low emissions even at partial or minimum load
>
>
>
>Facts:
>
>- body in steel sheet 4 mm thick
>
>- front frame in gray cast iron
>
>- combustion chamber cladding in vermiculite
>
>- combustion chamber floor in special refractory* material
>
>(*the meaning of the German word is probably more specific than this; see
>"Schamotte" in German Wikipedia)
>
>- double floor in highly heat resistant stainless* steel
>
>(*"Edelstahl" is usually translated as "stainless steel", but not every
>Edelstahl is stainless, and not every stainless steel is an Edelstahl; the
>term covers various special-purpose steels, as defined by the relevant
>standards)
>
>- twinfire grate in highly heat resistant stainless steel
>
>- ash box in highly heat resistant stainless steel
>
>- simple, ergonomic control via two thermally decoupled control elements
>
>- free choice of top or rear flue outlet
>
>- all stoves can be equipped with xeoos adaptor for external combustion air
>feed
>
>- xeoos stoves can optionally be equipped to be rotatable
>
>- the xeoos burns with normal chimney draft
>
>- five years' warranty on body
>
>
>
>
>
>Figure:
>
>
>
>Twinfire tuner
>
>Door handle/Twinfire starter
>
>Upper combustion chamber
>
>Twinfire grate
>
>Lower combustion chamber
>
>Ash box
>
>
>
>
>
>HTH
>
>
>
>Robert Taylor
>
>
>
>----- Original Message -----
>From: "Boll, Martin Dr." <boll.bn at t-online.de>
>To: <stoves at lists.bioenergylists.org>; "'Crispin Pemberton-Pigott'"
><crispinpigott at gmail.com>
>Sent: Thursday, August 04, 2011 6:10 AM
>Subject: Re: [Stoves] Wood fired, two-stage gasification employed
>
>
>> Crispin,
>>
>> There is another two-stage top to bottom burning room-heating-stove. I
saw
>> it some years ago here in Hatzfeld-Reddighausen, Germany, in the
show-room
>> of the producer.
>> It has natural draft!
>> The website is in German, Swedish and Polish, not in English. But the
>> pages
>> on bottom have pictures and short technical terms.
>> It is certainly even eco and bio but they do not make so much music about
>> that.
>> http://www.xeoos.de/technik/umwelttechnik.html
>>
>> http://www.xeoos.de/technik/brenntechnik.html
>>
>> - Interested in your meaning -
>>
>> Kind Regards
>> Martin
>
>
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