[Stoves] Hydrogen from charcoal

[Crispin Pemberton-Pigott]

Dear Frans

 

Those are very interesting considerations for emissions testers.

 

There are four sources of Hydrogen then: water in the ambient air, fuel
moisture, hydrogen in the fuel and moisture in the stove body if it is made
from a ceramic material.

 

I am discounting the possibility that there is much hydrogen in the ambient
air.

 

In case anyone would like to see the raw data it is pasted below your reply.
The high H2(EF) is not the result of an unusually high lambda value
multiplied by a tiny hydrogen concentration. There is quite a lot present
even at a significant dilution.

 

I see no other mechanism for this level – water gas shift reaction. It is
taking place at quite ordinary temperatures in relatively small fires (a few
kW).  This may encourage some gasifier builders to consider ways to create
better quality gas.

 

So, why is the ratio to CO almost constant in most tests? The correlation
coefficient between the CO and H2 is 97.7%. Given some room for instrument
error, that is pretty darn close to unity.

 

Regards

Crispin

 

 

Dear Crispin,

 

Dont forget: at 900 °C H2O +C------> H2 +CO Your plot is missing
themperature !

Mind hydrogen is dens 2 versus  28 for CO becouse every mol gas  =22,4 L .

So H2 escapes 14 times faster by Archimedes ....

If you measure in a horizontal stoofpipe! Up and down is different !!!

CO is not only the bad stove but the production from water in watergas .

The smoke must be returned into a glowing fuelmass . Fluidized sand  bed or
Karnetsoff system .

Hydrogen is free of no cost here ,so nobody has interesse to measure it .

 

 

Regards

Frans

 

++++++++++++

Raw data, H2, test SeTAR_539, charcoal

 


ppm H2 (5)


0


1


0


0


0


2


2


0


1


1


2


3


2


1


4


1


2


1


Ignition 3


1


1


0


0


0


0


0


2


10


17


26


35


44


51


55


58


59


62


61


59


57


54


51


50


47


46


45


44


43


43


40


41


42


43


46


49


55


58


62


69


73


78


84


87


92


98


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546


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574


586


599


611


624


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646


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677


685


695


706


720


735


746


760


773


787


799


813


828


839


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870


886


903


918


933


946


964


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997


1013


1030


1047


1059


1073


1088


1104


1121


1136


1151


1161


1175


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1195


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1189


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1157


1138


1119


1100


1086


1071


1057


1049


1040


1032


1026


1024


1019


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1010


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1002


997


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984


980


977


974


971


968


966


963


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955


948


940

 

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