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Re: Hydrogen fuel conversion NOx problem in combustion engines? In theory and after twenty years, still believed?...
Author: BOB2
Date: 10-19-2023 - 08:45
Oh FUD, not the H2 NOX myth again....?
NOx turned out not to be a problem at SunLine with combustible H2 or CNG blend "hythane" because of the physics that drives steam locomotives, the heat absorbing propeerties in H20.
When we began running hythane blend (20% H2 and 805 CNG)at SunLine Transit in the early 2000's the initial theoretical burn temperature calculations showed that with addition heat energy from a hotter burn, due to oxidizing more H2, that there would increase the creation of oxides of nitrogen (NOX) emissions, though a hythane blend at that level does reduce CO2 emissions by nearly 40%.
When folks hooked up the monitors to the tailpipes of the hythane powered buses, and measured the actual crap coming out of the buses, the NOX levels did not increase,and remained unchanged. The confusion from these "observed" emissions was solved when the "physics" was recalculated, to correct for the "cooling effect" of all of teh super heated steam (H20) that was created by the combusiotn of the extra H2, which absorbed so much of the excess heat, reducing the NOX that would have otherwise been produced.
This famous theor based "urban myth" about H2/NOX "problem" nonsense is apparently undergoing a "revival" with the "only wires" are "true" ZEV lobbying and propaganda, by some of these so-called "new urbanist" front groups.
NOx turned out not to be a problem at SunLine with combustible H2 or CNG blend "hythane" because of the physics that drives steam locomotives, the heat absorbing propeerties in H20.
When we began running hythane blend (20% H2 and 805 CNG)at SunLine Transit in the early 2000's the initial theoretical burn temperature calculations showed that with addition heat energy from a hotter burn, due to oxidizing more H2, that there would increase the creation of oxides of nitrogen (NOX) emissions, though a hythane blend at that level does reduce CO2 emissions by nearly 40%.
When folks hooked up the monitors to the tailpipes of the hythane powered buses, and measured the actual crap coming out of the buses, the NOX levels did not increase,and remained unchanged. The confusion from these "observed" emissions was solved when the "physics" was recalculated, to correct for the "cooling effect" of all of teh super heated steam (H20) that was created by the combusiotn of the extra H2, which absorbed so much of the excess heat, reducing the NOX that would have otherwise been produced.
This famous theor based "urban myth" about H2/NOX "problem" nonsense is apparently undergoing a "revival" with the "only wires" are "true" ZEV lobbying and propaganda, by some of these so-called "new urbanist" front groups.
