[Stoves] Blue flame of TLUD-FA with rice hull fuel

[Anderson, Paul]

Good comments from several people.

Can the differences between the reported values be paired with the something that explains the differences, such as device type?

All list “ash” in the 16 to 20 percent range.   But no separation  of Silica-type ash vs other ash (inert chemicals).   Are there differences?   Are they important (possibly not), but the ash of rice hull IS different from the ash of woody biomass.   There was a comment about the SiO2 impact,  but that seems to be set aside, and I would like more clarity about it and its impact.

Is there a difference in the amount of Silicon (or SiO2) if the rice hulls being analyzed are from one  device versus a different device (one being the Belonio-style TLUD-FA stove)?   In other words, when we get the nice blue flame in  the TLUD, is something different from some other burning, pyrolysis, combustion of rice hulls?

Who has used pelletized (or briquetted) rice hulls in a TLUD stove?   And have you ALSO used the loose rice hulls?   Any observed difference in the flames?   More yellow, maybe?

If the rice hulls have a desired impact, what would be the impact of having rice hull material as some percentage of woody pellets?   What if 40% - 60% proportion?  (either way 40 – 60 or 60 -40).

Ron, the issue of charcoal (a product of pyrolysis) burning with blue color is not comparable with the real-time pyrolytic TLUD flames from rice hulls.

I have never heard anyone discuss pelletizing or briquetting of the char from pyrolyzed rice hulls, and then how they burn the same or differently from pelletized / briquetted char from  wood.   Less energy because of higher % of ash (silica), but otherwise different burning????

Paul

Doc / Dr TLUD / Paul S. Anderson, PhD
Exec. Dir. of Juntos Energy Solutions NFP
Email:  psanders at ilstu.edu<mailto:psanders at ilstu.edu>       Skype:   paultlud
Phone:  Office: 309-452-7072    Mobile: 309-531-4434
Website:   www.drtlud.com<http://www.drtlud.com>

From: Stoves <stoves-bounces at lists.bioenergylists.org> On Behalf Of Julien Winter
Sent: Saturday, January 12, 2019 6:43 PM
To: Discussion of biomass cooking stoves <stoves at lists.bioenergylists.org>
Subject: Re: [Stoves] Blue flame of TLUD-FA with rice hull fuel

Here are some more rice hull compositions:

Jenkins BM; Baxter, LL; Miles, TR Jr.; Miles, TR. 1998. Combustion properties of biomass.  Fuel Processing Technology 54:17-46

                      Rice husk    Rice straw
Higher heating value (constant volume)
MJ/kg 15.84     15.09
Btu/lb 6811.00                6486.00
Proximate analysis (% dry fuel)
Fixed carbon    16.22     15.86
Volatile matter               63.52     65.47
Ash      20.26     18.67
              100.00 100.00
Ultimate analysis (% dry fuel)
Carbon               38.83     38.24
Hydrogen          4.75        5.20
Oxygen (diff.)  35.47     36.26
Nitrogen            0.52       0.87
Sulphur              0.05       0.18
Chlorine             0.12       0.58
Ash      20.26     18.67
              100.00 100.00
Elemental composition of ash (%)
SiO2    91.42     74.67
Al2O3 0.78       1.04
TiO2                                                    0.02       0.09
Fe2O3                 0.14       0.85
CaO     3.21       3.01
MgO    <0.01     1.75
Na2O  0.21       0.96
K2O     3.71       12.30
SO3      0.72       1.24
P2O5   0.43       1.4
CO2 / other
Total    100.64   100
Undetermined 0.64        2.68



--
Julien Winter
Cobourg, ON, CANADA
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