4.15.2.3 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, for example to be
ready for a fast change to Tier III mode.
Fig 4-31 HP SCR system - preparation
V1 V2
V3
V7
V4
003
001
007
006
005
004
002
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
X92DF
AA00-9270-00AAA-043A-A
Operation Manual HP Selective catalytic reduction system
Winterthur Gas & Diesel Ltd.
- 127 - Issue 002 2020-08
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