Volvo VAH 2013, Руководство оператора, Страница: 104 / 175

100 Operator's Manual Vehicle Maintenance VN,
VHD
CAUTION
Do not put diesel fuel in the
Aftertreatment DEF tank. Diesel
fuel, if sprayed into the hot exhaust
along with the DEF, could ignite
explosively causing a fire resulting
in personal injury or damage to the
exhaust system.
There are two different configurations for the SCR catalysts, they are vertical and
horizontal. The horizontal SCR catalyst comes in two different sizes, one for the
D11/D13 engines and larger size for the D16 engine. The vertical SCR catalyst also
comes in two different sizes, one for the D11/D13 engines and larger size for the D16
engine.
The VOLVO SCR system is simple and effective, with few components. It consists
of a Aftertreatment DEF tank positioned near the standard diesel tank, plus a
Aftertreatment DEF pump, Aftertreatment DEF Dosing unit and SCR catalyst. The
advantage of using DEF is that it enables the engine to use less EGR -- and higher
oxygen levels -- for better combustion, while meeting the EPA near-zero NOx
emissions requirement of 0.2 g/hp-hr NOx. By using DEF, we avoid the disadvantages
of increasing EGR to massive levels. This results in better fuel economy from your
VOLVO engine.