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at www.dieselprogress.com At the recent announcement of its Tier 4 interim/Stage 3b engine strategy, Caterpillar also introduced its portfolio of tech- nologies to meet Tier 4 interim emis- sions regulations for mobile and sta- tionary generator sets. Steve Niehaus, general manager, Electric Power North America, said the Tier 4 interim regulations affect the majority of nonroad mobile equipment powered by diesel en- gines greater than 130 bkW, includ- ing mobile generator sets. Stationary diesel engines, such as those used in standby and prime power genera- tor sets, are regulated separately, but to similar standards as nonroad mobile equipment. However, Niehaus said the chal- lenges facing the electric power industry are unique in a number of areas, particularly above 900 bkW, where the regulations focus on reduc- ing NOx emissions from generator sets by 90%, compared to a 45% reduction for other equipment types.As a result, Robert Koval, global product director of the Electric Power Division, said Caterpillar has devel- oped three different engine-integrated technology packages that can be used, in combination, to address the various emissions reduction levels required by the EPA regulations. 130 to 560 bkW: On the engine side, an electronically controlled air management system lowers the com- bustion temperature by combining a “small amount” of EGR with the com- bustion air, resulting in decreased NOx output. For aftertreatment, a diesel oxidation catalyst and particu- late filter with an automated regener- ation system are incorporated into the package design to reduce PM to less than the regulatory requirement, Cat said. 560 to 900 bkW: As the regulated PM limit is higher in this power range, the emissions control on the engine alone can meet the requirement with- out the need for aftertreatment. 900 bkW and above: The engines feature low-soot combustion tech- niques, incorporating detail changes to piston bowl design, injector config- uration and turbocharger matching.In terms of aftertreatment, a diesel oxidation catalyst combined with a se- lective catalytic reduction (SCR) mod- ule, with an air-assisted urea injection Power Gen Says “Yes” (In Part) To SCR system, form the clean air system for larger diesel generator sets.In addition to the Caterpillar- designed aftertreatment system, a dosing control module, diesel emis- sions fluid tank and air source are integrated into the generator pack- age design. dp For those engine models requiring aftertreatment, Caterpillar has devel- oped a range of Clean Emissions Modules — integrated and modular sys- tems that include a diesel oxidation cat- alyst, diesel particulate filter, an active regeneration system, supporting cradle, air cleaner and sensors and controls.
Finally, in terms of the cost of meet- ing Tier 4 interim and Stage 3b, Utley said it cost “substantially more” than the $1 billion Cat spent to develop ACERT — itself a key element in the company’s emissions strategy. In facilities alone, Cat has recently opened a Large Payload Structural Dynamics Lab, at its Mossville, Ill., Tech Center, as well as a 3. 75 acre machine development center, with 140,000 sq.ft. under roof for Tier 4 testing. Details on Cat’s various engine group strategies can be found in accompanying articles. dp
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