[Stoves] Pellet stoves - risks

Frank Shields franke at cruzio.com
Sat Sep 5 23:45:52 CDT 2015


Dear Dean, Stovers,

I have not worked with stoves but working with all types of pellets (paper, manures, etc.) and good quality wood pellets I find they burn in pipes very poorly and seem they are really just good for pellet stoves dropping in one at a time. 
I think you may be on to something in regards to torrifying to some extent before using to get a cleaner combustion. I see the real challenge is quality control because torrification takes place in a very narrow range and it is so easy to have a ‘run-a-way’ combustion that heats higher than the setting you want. I was able to achieve that in my pipes but only after much practice and   s l o w l y    raising the temperature to desired amount. Not sure how this would be done commercially.  It would be a very interesting project. 

We also may be able to get clean combustion by finding constituents in the pellets (and all biomass for that matter) that create these large organic volatile structures that give problems and eliminate them from the fuel. 

Regards


Frank

  




Frank Shields
franke at cruzio.com




> On Sep 3, 2015, at 12:28 PM, Dean Still <deankstill at gmail.com> wrote:
> 
> Hi Frank,
> 
> After limited experience in Uganda and China my experience is that it's not easy to make clean burning recipes for biomass pellets. 
> 
> Seems like the torrified pellets emit less PM but we need to do more tests.
> 
> Best,
> 
> Dean
> 
> On Thu, Sep 3, 2015 at 8:44 AM, Frank Shields <franke at cruzio.com <mailto:franke at cruzio.com>> wrote:
> Dear Chispin and stovers
> 
> 
> Of course no mention of the quality of the pellets! In the U.S. The go through standard testing and results labeled
> On bags. But pellets are made of all sorts of materials and energy values and volatile profiles.   It would seem this would be part of the discussion. 
> Thanks
> Frank
> 
> Sent from my iPhone
> 
> On Sep 3, 2015, at 6:13 AM, Crispin Pemberton-Pigott <crispinpigott at outlook.com <mailto:crispinpigott at outlook.com>> wrote:
> 
>> Dear Friends
>> 
>>  
>> 
>> There is a broad move around the world to create pelleted fuel from biomass and burn it in tighter spaces. This report was noted in the Alliance for Green Heat newsletter:
>> 
>>  
>> 
>> Updated on the Mt. Vernon pellet stove recall <http://r20.rs6.net/tn.jsp?f=001d7dcszljjgfEKYA31aaHyRsMRRejQSaDUDJHpy5B3lPW1W0QcteHERbDFukIhEc2-_1cKtvym49J_ai7zvt1WWN26UenG3N6joIskOVraQhcc__S5dpEwVlcw8pbpwWuwRufyvZSstnraBJTXAbr2wOPL-tX7Wypj3swduscC5I1Staun8b2olWMeGwuEsLEKsSA0qsYd2J1B5b7fDXOH7vLn_jPI3y12xty5nULquL9LCJu6LE7P-Ysu5qiL45LFwfyKNL4feu5XOzEawUh0a7X5VAZM8fb7F4K1l1kHGeFIFftvkxNTEEi9J_I05V6LKmiIZSk4GOQXJRAMRf5NDba52L-Wn_9jVkbpqju9Kifq8bMZm_xowV5Qn2NerYbUfu00_a4isbrvL9gktLkSQ==&c=WnPhxOQ3V-ic1ZJ3NBDpcipfRPq-UdIrBKPYwMfkxe-_CRS45fkQ4w==&ch=gnDbpciWOWhz6yV0o8Zdcoli15r_rpgR21xk0iBJKKi_KYRnwLVmTw==>
>> Last month, we reported on the recall of 2,000 Mt. Vernon E2 pellet stoves after about 6 experienced explosions that shattered the glass in the front door. No injuries have been reported. The Alliance wrote to HHT asking for clarifications about what caused the malfunction and whether the stove would be 3rd party tested again for safety. Click here <http://r20.rs6.net/tn.jsp?f=001d7dcszljjgfEKYA31aaHyRsMRRejQSaDUDJHpy5B3lPW1W0QcteHEfKhE4oT8BuuAHDwJ1L0g7GrKo5I0xEbbDvkpCt65Xds638GUTKpc9WxdvAozGBIprVOl7vL1wQKB10dTQFUofpAQnr3z9i2zwxCfiQA3rCg4PVvKxSMWgMWDhYiC_fJ7rGJlBpUwsdpb9A-KCa9c_WZg3sRbG1GpSOEsBvotEVw3FLKELU68l1aktAt4KqIrr-AbESuj8iSP6u9wdRQU3L5aMshSI5ocFejIUjrSB94PP9Q2h_zrmWcq3brFPbj1VqWZSiFfmDp50WpCw2b2SOvJ-9NqzbOgn8sgdzIHO2tNWqczgkuFI6d7bzwPt4D_g==&c=WnPhxOQ3V-ic1ZJ3NBDpcipfRPq-UdIrBKPYwMfkxe-_CRS45fkQ4w==&ch=gnDbpciWOWhz6yV0o8Zdcoli15r_rpgR21xk0iBJKKi_KYRnwLVmTw==> for a copy of the HHT response.
>>  
>> 
>> The drive to create better combustion often means having a staged gasification-then-burning type of design. That may be a source of problems.
>> 
>>  
>> 
>> I know of at least one instance of a very modern TLUD coal stove explosion in Ulaanbaatar when the operator refuelled it with a significant amount of lignite (high volatiles) while it was already very hot. This generated a huge amount of combustible gas while simultaneously extinguishing the gas flame.  Eventually it heated up to the point that the gas ignited and it blew flaming fuel out of the top of the stove, around the room.  A public education campaign tried to prevent exactly this sort of mis-operation.
>> 
>>  
>> 
>> Regards
>> 
>> Crispin
>> 
>>  
>> 
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> 
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> -- 
> Dean Still
> Executive Director
> Aprovecho Research Center
> PO Box 1175
> 76132 Blue Mountain School Road
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> (541) 767-0287
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