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

[rongretlarson at comcast.net]

Crispin: 

Thanks for this report. 

Can this or any of the ELCD designs be used to produce char? 

Can this be fed with biomass briquettes or pellets as well as coal? 

How does one switch from TLUD to ELCD - and are both controllable for both primary and secondary air? 

Ron 


----- Original Message ----- 
From: "Crispin Pemberton-Pigott" <crispinpigott at gmail.com> 
To: "Stoves" <stoves at lists.bioenergylists.org> 
Sent: Tuesday, March 1, 2011 11:40:47 PM 
Subject: [Stoves] Refuelable TLUD Coal Stove developed in Mongolia that is not a batch process. 




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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