I have used 10 kg of wood conversion pyrolysis unit. I need to know the flow rate of nitrogen gas supply for the entire process. Any suggestions?
Please find the link below:
http://www.sciencedirect.com/science/article/pii/S1877705813001434
It is a favorable question for me as I had published my consideration on that first in 2007 (Journal of Engineering Physics and Thermophysics, Vol.81. No 4, 2008, pages 781-786), operating not with nitrogen, but steam co-generated with the same pyrolysis processing of tire shreds. Basing on that pyrolysis gas to be mixed and diluted with steam so much as to be non-explosive with air, through both of consideration on the gas fuel activation energy and its ignition tem-perature it had been theoretically calculated as 5.77 kg steam required per 1 kg tire pyrolysis processing that was too much than steam could be co-generated.
The next idea on that had been calculated and published in the same journal (Vol. 83, No 2, 2010, pages 324-330), operating with a superheated steam supply into reactor at the same pyrolysis temp around 400oC and considering the steam function to prevent a counter-flow air penetration into reactor (of cylindrical auger type) in case of failure with any of airlock devices (double-dump or flap gates), and taking into account the reactor must be operated under some of low-negative pressure. With reference to the journal it was next included in both of my pub-lications on tire pyrolysis recycling with steam on my page in Research Gate. The idea is simply concluded in that the positive dynamic pressure of steam supply flow in reactor cross-section (and for nitrogen too):
(see equation in attached file)
to be equaled to the negative pressure (draft) with air flow from outside that is performed under the chimney effect and depended as min on the temp difference between reactor inside and open air (the low-negative pressure of vacuum fan can be included additionally to that):
(see in attached file)
Resulting and calculating equation for the steam specific supply per 1 m2 reactor cross-section was obtained as the function of the temp inside reactor, comparing to that as no problem when the ambient temp inside:
(see in attached file)
where = 9.81 is gravity constant value, is both of air (a) and superheated steam (ss) density, by which way it had been calculated around as min 1200 kg/hr steam per 1 m2 reactor cross-section to be supplied against of air penetration from outside (independently on the kind of pyrolysis matter). As for nitrogen, steam density in the calculating equation above to be simply changed for that.
Best Regards,
Dr. U.Kalitko
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