Scr Diesel Deliversgood Fuel Economy

摘要

One year from now, in January 2010, all new diesels for sale in the United States and Canada will have to meet even tougher exhaust emissions limits than now, and many will do it with selective catalytic reduction. SCR equipment, already used in many diesels in Europe and Japan, sprays a urea solution into the exhaust stream to break down oxides of nitrogen -the NOx that causes smog - into harmless nitrogen and water vapor. SCR also promises better fuel economy.rnThat's about what they're finding at Haines & Kibblehouse Inc., a contractor based in eastern Pennsylvania, which ran a Granite dump truck with a 2010-spec Mack Power engine in everyday service. The Granite is the very first Mack built with an SCR engine, and last April it was loaned to H&K for testing.rnBy mid-September, when I visited the company's Skippack headquarters, the engine had worked well and saved a goodly amount of fuel, according to Dan Alderfer, the fleet's superintendent.