4.12.2.3
HP SCR system - preparation
In this operation mode, exhaust gas causes the temperature of the HP SCR reactor to slowly
increase. The engine operates in Tier II mode. Urea solution is not injected.
The valves have the conditions that follow:
•
V1 - Open
•
V2 - Slowly changes from closed to open
•
V3 - Slowly changes from open to closed
•
V4 - Controlled by the ECS
•
V7 - Closed
If necessary, you can operate the engine in this mode for longer periods, eg to be ready for a fast
change to Tier III mode.
Fig 4-18
HP SCR system - preparation
V1
V2
V3
V7
V4
003
001
007
006
005
004
002
00523
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
X52
AA00-9270-00AAA-043A-A
Operation Manual
HP Selective catalytic reduction system
Winterthur Gas & Diesel Ltd.
- 99 -
Issue 002 2018-11