Fig 4-15 LP SCR bypass rate controlled (example)
V3
V1
V4
V2
002 003 005001
006
004
Legend
001 Engine 004 Burner
002 Urea dosing unit 005 LP SCR reactor
003 Decomposition unit 006 Turbocharger
4.14.2 Operation modes
The LP SCR system can be operated if the exhaust gas temperature is in the permitted limits.
These limits are adjusted during commissioning. A temperature that is less than the permitted
limit can cause the catalyst elements to clog. A temperature that is more than the permitted limit
can cause the catalyst elements to become worn quickly.
4.14.2.1 LP SCR system - (emergency) bypass
In this operation mode, the LP SCR system is bypassed. The engine operates in Tier II mode.
Urea solution is not injected.
The valves have the conditions that follow:
•
V1 - closed
•
V2 - closed
•
V3 - open
•
V4 - the control systems control this valve.
X92DF
AA00-9270-00AAA-043B-A
Operation Manual LP Selective catalytic reduction system
Winterthur Gas & Diesel Ltd.
- 108 - Issue 002 2020-08
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