The Scania SCR system. Item 1 is the AdBlue tank with pump module; item 6 is the hydrolysis catalyst with the AdBlue doser; item 7 is the NOx sensor with control unit; and item 8 isthe SCR catalyst. The remaining items are vari- ous components making the system complete and auto- matic.
SCANIA SELECTS SCR SCR lowers fuel consumption and reduces CO2 emissions for Scania
BY BO SVENSSON Despite early indications that Scania engines would imple- ment exhaust gas recircula- tion (EGR) as its main method to meet upcoming emissions regulations, the company has decided to use selective catalytic reduction (SCR) as its first choice for emissions reduction tech- nology on its industrial engines to meet Stage 3b/Tier 4 interim and Stage 4/Tier 4 final. “We have now chosen to use the SCR technology on our industrial engines for 2011, since this gives the best overall performance for our cus- tomers when it comes to performance and operational cost,” said Robert Sobocki, senior vice president, Scania Engines. “When we started the project, we were developing engines with both concepts, EGR and SCR, but specific vital customer needs in the industrial segment and our own tests with both technologies made us decide on SCR.” Scania has experience with both the EGR and SCR technologies and can currently offer the customer a choice of either EGR or SCR on its truck models. By offering both technologies, Scania’s products are adaptable to a variety of operating conditions, said the company. “An important factor in favor of SCR is the environmental performance. The substantially lower diesel consumption of an industrial SCR engine helps to reduce the CO2 emissions, which is the ambition of Scania,” said Magnus Henrikson, director, Technical Develop- ment, Scania Engines. “Another impor- tant feature for many industrial applica- tions is the engine’s response time from idling to maximum torque. With SCR, the engine can be designed to give a fast response, something the EGR system will not permit.” For Stage 3b/Tier 4 interim in 2011, Scania is introducing a new engine
80 DIESEL PROGRESS NORTH AMERICAN EDI TION April 2010