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
Fig 4-12
HP SCR system - purging and venting
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
After that procedure, or directly, the venting/sealing unit supplies compressed air to keep a
pressure in the reactor and in the pipes. This makes a seal against the exhaust gas to prevent
damage of the reactor. Make sure that the pressure in the reactor is more than the exhaust gas
pressure.
The valves have the conditions that follow:
•
V1 - Closed
•
V2 - Closed
•
V3 - Open
•
V4 - Controlled by the ECS
•
V7 - Closed, can be opened to decrease the pressure in the reactor
X72-B
AA00-9270-00AAA-043A-A
Operation Manual
HP Selective catalytic reduction system
Winterthur Gas & Diesel Ltd.
- 101 -
Issue 003 2021-12