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

[Crispin Pemberton-Pigott]

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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