PRODUCTION • PROCESSING • HANDLING
Improved combustion technology allows control of PM in the engine while SCR reduces NOx emissions in the exhaust
requirements. Tis system enables heat rejection and peak cylinder temperatures to be kept at similar levels to Tier 2. A wastegated turbocharger arrangement enables more precise management of air flow, increasing efficiency and improving load acceptance. DEF, the reactant used in SCR aftertreatment systems, is an aqueous solution of 32.5% industrial urea in 67.5% pure water. It is nonflammable and non-toxic. As a part of the SCR aftertreatment system, DEF is injected into the exhaust stream ahead of the catalyst. DEF freezes at 12 F (-11°C) and thaws at consistent concentration. DEF consumption varies by duty cycle and operating conditions, but is typically consumed at a rate of 3-5% of diesel fuel. Companies operating in the oil and gas field are
becoming familiar with DEF and its use. In North America the trucks used to pull equipment in and out of the field have utilised DEF since 2010. And many engines providing power to other off highway applications at well sites are also using SCR technology. DEF is readily available from the same suppliers that deliver bulk fuel as well as at well- established pump locations on all major interstate trucking routes. Tier 4 Final emissions requirements and the strategies for meeting them are new to many in the oil and gas industry. With global on- and off-road engine experience, Cummins has clear emissions technology leadership and experience with the numerous technology paths available to meet increasingly stringent requirements. Its in-house experts evaluated all viable technology paths before identifying SCR as the ideal aftertreatment solution for engines above 751hp. Well over a million SCR systems are in operation today, delivering the performance, reliability and durability required by the oil and gas market. l
For more information ✔ at
www.engineerlive.com/iog
Frank Griffin is with Cummins.
www.cummins.com
DELIVERING
KNOWLEDGE. BUILDING CAREERS.
DEVELOPING COMPETENCE.
PetroSkills can help you and your organization develop the knowledge and skills to succeed TODAY.
Find out how at
www.petroskills.com/today For more information ✔ at
www.engineerlive.com/iog
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