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 is the SCR catalyst. The remaining items
are various components
making the system complete and automatic.
BY BO SVENSSON Despite early indications that Scania engines would implement exhaust gas recirculation (EGR)
as its main method to meet upcoming
emissions regulations, the company has
decided to use selective catalytic reduction (SCR) as their first choice for emissions reduction technology 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 customers 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.
SCANIA SELECTS SCR
SCR lowers fuel consumption and reduces CO2 emissions for Scania
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
22 January-February 2010
The upper curve of the diagram shows the maximum output/speed for the six-cylinder
12. 7 L DC13 engine. The lower curve indicates the maximum torque over engine speed
for the same engine. The torque increases as the speed drops down to 1300 r/min.
