4.15.2.4 HP SCR system - Tier III
In this operation mode, the HP SCR system is set to ON. The engine operates in Tier III mode.
Urea solution is injected.
The valves have the conditions that follow:
•
V1 - Open
•
V2 - Open
•
V3 - Closed
•
V4 - Controlled by the ECS, can be more opened to decrease the scavenge air flow and
thus to increase the exhaust gas temperature
•
V7 - Closed, can be opened to decrease the pressure in the reactor
Fig 4-32 HP SCR system - Tier III
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.
- 128 - Issue 002 2020-08
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