Legend
001 Mixing duct 005 Venting/sealing unit
002 Reactor 006 Urea solution supply unit
003 Turbine of turbocharger 007 Soot blowing unit
004 Engine
The HP SCR system can be operated, if the exhaust gas temperature after the exhaust gas
manifold is in the permitted limits shown in Table 4-6 - Operation limits of exhaust gas
temperature after exhaust gas manifold. A temperature that is less than the given limit can
cause the catalyst elements to clog. A temperature that is more than the given limit can cause
the catalyst elements to age faster.
Tab 4-6 Operation limits of exhaust gas temperature after exhaust gas manifold
Operation mode T
min
T
max
Preparation (urea injection OFF) 200°C 470°C
Use of low sulphur fuel (≤ 0.5% S) (urea injection ON) 310°C 470°C
Use of high sulphur fuel (> 0.5% S) (urea injection ON)
1
325 to 340°C
2
470°C
1
Refer to the HP SCR system documentation if the operation of the HP SCR system with
high sulphur fuel is permitted.
2
The engine control system (ECS) calculates this value related to the engine load and to
the exhaust gas pressure.
NOTE: WinGD recommends to do a test of the valves regularly during engine stop, refer to
Figure 4-40.
4.15.2 Operation modes
The HP SCR system has the operation modes that follow.
X92DF
AA00-9270-00AAA-043A-A
Operation Manual HP Selective catalytic reduction system
Winterthur Gas & Diesel Ltd.
- 122 - Issue 002 2020-08
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