On Mon, 2 Aug 2010 14:16:38 -0400, Brian wrote in message <[email protected]>:
> And it is generally accepted that the optimal air blast through the > tuyeres is (roughly) between 25 - 35 m/s ..if your hearth diameter is in the 100 to 300mm range for modern 4-strokes, yes, or in the 220 to 300mm for the old big 2-strokes. ;o) ..to eat the entire range, you wanna be between 22m/s for 70mm to 33m/s for 300mm, and 14.7m/s to 22.1m/s for the big old 2-strokes at full load, according to Gengas. The "lower" speeds for 2-strokes, are pulse averages, smaller faster engines will have uniform suction thru the gasifier. > (m3/m2-s) air, yes? > > (Based on air volume calculations at 0C.) ..nope, "full load" according to Gengas, means "0.9Nm^3/cm^2h thru the hearth", or "2.5m/s", both if you do the math on the messy "metric" units or re-check the Gengas math. ;o) ..keep in mind your tuyere air flow is only 60% of your gas flow, you _produce_ the "other 40%" gas in the gasifier. ;o) > -brian > > > On Aug 2, 2010, at 12:34 PM, Arnt Karlsen wrote: > > > On Sun, 1 Aug 2010 20:51:39 -0400, Brian wrote in message > > <[email protected]>: > > > >> Hi all, > >> > >> When calculating gas flows through the input ports (tuyeres) and > >> then across the cross section of the constriction/hearth, what is > >> typical in the art of wood/biomass gasification? To do the gas > >> volume calc's at ambient air temp? Hearth temp? European normal, > >> 0C? US standard, 77F, 25C? Or something else? > >> > >> Thanks! > > > > ..the Gengas uses 0 degrees Celsius for its "Normalkubikmeter" > > or "Nm3" standard in its gas reaction and gas flow calculations. -- ..med vennlig hilsen = with Kind Regards from Arnt... ;o) ...with a number of polar bear hunters in his ancestry... Scenarios always come in sets of three: best case, worst case, and just in case. _______________________________________________ Gasification mailing list [email protected] http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org http://gasifiers.bioenergylists.org http://info.bioenergylists.org
