[Stoves] Refuelable TLUD Coal Stove developed in Mongolia that is not a batch process.

[Paul S. Anderson]

Crispin,

Good report.  Consider sending the final full report to the Stove website.

Note to all:  It is increasingly evident from MANY sources that people  
are not aware that a true TLUD can end its fundamental operation (the  
pyrolysis front moving downward) and then be combusting in a manner  
that is NOT at TLUD basic operation, in what might be called "phase  
two" such as after adding more fuel.

Crispin, please check and clarify if there is a pyrolysis front action  
in the stove after you add more fuel (and after the initial pyrolysis  
front has reached the bottom).  I suspect not.

Also, when the moving pyrolysis front has ended and a new regime of  
combustion has taken over, there can be a difference in the emissions.  
  Usually it is an increase in the CO because the second phase is  
directly char-gasifying the charcoal (or coke in the case of coal  
fuel).  Crispin, can you compare the emissions from your unit in the  
true TLUD phase and also in the second phase after the end of the  
moving pyrolysis front?

Congratulations to all in UB working on these issues.

Paul
-- 
Paul S. Anderson, PhD
Known to some as:  Dr. TLUD    Doc    Professor
Phone (USA): 309-452-7072   SKYPE: paultlud   Email: psanders at ilstu.edu



Quoting Crispin Pemberton-Pigott <crispinpigott at gmail.com>:

> Dear TLUD Fans
>
> We have been testing several TLUD stoves at the SEET laboratory in
> Ulaanbaatar this past week.  Today we had the great pleasure of testing a
> stove that was locally developed by a Mongolian on his own which is the
> cleanest and most thermally efficient (the combination) we have seen emerge
> from the 'townships'.
>
> It is called the NDHSHZ. It is not particularly a thing of beauty but that
> is mere cosmetics! Thermal efficiency is very easy to change so that is no
> issue either. Presently it is about 76% efficient. That translates into a
> fuel saving of 23% over the baseline.
>
> It is a TLUD which can be loaded with 4 kg of high volatiles Nalaikh
> lignite. It was refuelled, while running, with 2 kg of same. Refuelled, you
> say? Yes! It is a refuellable TLUD with the refuelling technique based on
> the ELCD (end-lit cross draft) stove refuelling technique. The coals are
> pushed to the back and the coal added through a side door against the hot
> coals (coke, actually, by that time).
>
> The pick-up was great - very rapid and at present the CO ppm is 72 with
> excess air sitting at 125%. That gives a CO(EF) of 162 ppm(v). With the CO2
> Max considered it is a CO/CO ratio of 0.0088%. We will know the total later.
>
> The test protocol (SeTAR 2.59.1) gives the net thermal efficiency as a
> heater, the PM emissions per net MJ (delivered into the room) and the CO per
> net MJ. We are expecting this it easily be in the cleanest 10 stoves tested
> so far, maybe top 5.
>
> Position 1 is still held by the GTZ 7.5 crossdraft stove with 0.46 mg of PM
> 2.5 per Net MJ delivered into the room.
>
> The baseline stoves are 650 mg/Net MJ. At present stoves achieving 70 mg/Net
> MJ will qualify for promotion (and subsidy).
>
> When the stove NDHSHZ TLUD is well-lit and running well the PM mass emitted
> is below the PM mass drawn into the stove from the ambient air. I think we
> have seen at least 10 stoves that reach this condition. The goal still
> eluding us is a Net PM reduction over the whole burn cycle. Now 2.5 hours
> into the burn the PM needle is pegging 0 to 5 microgrammes per m^3. That is
> probably below the lower resolution limit of the machine. The ambient air is
> presently 80 microgrammes/m^3 though at the beginning of the test it was
> 410. That is considered a good day in UB.
>
> The test outputs will be available in a few days. At this time we have
> nowhere to post them but they are available on request.
>
> Regards
>
> Crispin in sunny, cold UB, -22 this morning.
>
>
>
>



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