During pyrolysis, we generally use nitrogen gas. However, there is limited research about the gas flow rate in the pyrolysis chamber. If anyone provides some idea about this, will be helpful.
Dear Chandra Sekhar Paul,
I am not a specialist of your subject but the existence of xenon compounds and othersof supposed inert gas have led to suppose a role of bond of the outermost shell of the atoms see: Chernick C.L., Rec. Chem. Prog., 24, 139-155, (1962), and my work “From Ln valence to that of 3d”.
Increasing the carrier gas flow rate removes volatile matter faster from the hot zone, reducing secondary exothermic reactions such as thermal cracking, partial oxidation, repolymerisation and recondensation leading to decreased char formation.
Dear Paul Chandra Sekhar
The flow rate must be optimized. The lower flow rate will increase the tenden@cy of the secondary cracking as mentioned by Anil Kumar Sakhiya and the higher flow rate will affect the condensation part for the bio-oil separation.
https://www.sciencedirect.com/topics/engineering/nitrogen-flow-rate
As Anil Kumar Sakhiya mentioned, increasing N2 flow rate reduces vapour residence time and thus decreases the charring-favoured reactions (e.g., condensation and repolymerization reactions), leading to reduced biochar yield with increased specific surface area. So, it is a trade-off between biochar yield and biochar porosity.
As discussed earlier it may effect the production yield and the composition. However, there are several other properties which may be coonaidered while chosing the inert gas and its flowrate such as porosity, surface area, yield or bio-oil etc. Optimum flowrate is required in this concern. At the begining flush the inert gas so that it may lead to free oxygen environment inside the reactor later the flowrate might be slow down.
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