12-08-2009, 10:41 PM
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#63 (permalink)
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Moderate your Moderation.
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919
Pasta - '96 Volkswagen Passat TDi 90 day: 45.22 mpg (US)
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Quote:
Originally Posted by roflwaffle
Heavy duty trucks just go w/ urea aftertreatment if anything. Treating the entire exhaust stream w/ water is far too weight/volume intensive for a road going vehicle, so what manufacturers do is minimize what NOx emissions they can, use a SCR system to capture the rest, and periodically inject the urea solution into the exhaust stream in order to clean it out. Rinse and repeat. Regarding water recovery, the water has to be deionized, so unless that can be done on the truck, contaminants from the exhaust stream will poison the SCR system.
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Further adding to weight and complexity, of course. By the time we got done with a sufficient system, we'd need a bigger engine to haul it all around.
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