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Detroit Diesel Engine 13/03/2008 Detroit diesel made a splash at the ConExpo in Las Vegas 2008 with its Series 900 engine that will be compliant with the nonroad interim Tier 4 emission standards. The Detroit diesel engine meets the Tier 4 emission standards using the selective catalytic reduction (SCR) technology, without a diesel particulate filter. The Series 900 and Series 500 engine families achieved the low emission by calibrating the Detroit diesel engine for low PM emissions, to meet the PM emission standard without the need for a particulate filter. The engine will use SCR technology to control any increase in NOx emissions from the low-PM calibration. The US Tier 4i standards will become effective on January 1, 2011 for engines above 130 kW. The SCR system used in the Detroit Diesel engine will replace the conventional muffler and consists of engine-mounted hardware, urea lines, electrical wiring and a catalyst unit somewhat larger than a muffler. The SCR system has not been picked up by everyone in the industry, nonroad engine manufacturers are divided on the SCR technology. Manufacturers like John Deere has announced that its Tier 4i engines will not be using the SCR technology but instead will be fitted with diesel particulate filters. The SCR system used in Detroit diesel engines works by injecting urea into the exhaust stream this then decomposes into ammonia which in turn reacts with nitrogen oxides over the SCR catalysts and finally is converted into harmless product. According to MTU urea consumption is not expected to exceed 5% of fuel consumption, although it varies with the engine load and other factors. Urea will most likely become a required component for highway diesel engines to meet the US emission standards by 2010. Urea is non-toxic and does not require special handling, in fact it will be become standard to refill nonroad equipment with urea when you refuel the machine. |
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