4.13.3
LP SCR control system
The main tasks of the WinGD control system for the LP SCR system are as follows:
•
Calculate the setpoint position for the turbine bypass valve (V4) to control the exhaust gas
temperature.
•
Control the operation of the auxiliary blowers.
•
Calculate the setpoint for the urea dosing unit.
Related to the input signals the LP SCR control system gives the related signals to the LP SCR
system, refer to
.
Fig 4-28
LP SCR control system layout
001
002
003
Legend
001
Input signals
003
Output signals
002
LP SCR control system
The main input signals are as follows:
•
Engine parameters
•
Prepare Tier III command from RCS
•
Tier III command from RCS
•
Position of turbine bypass valve (V4)
•
Different temperatures and pressures
The main output signals are as follows:
•
Different temperatures and pressures
•
Signals to enable or disable the LP SCR system
The principal control configuration of the LP SCR system is shown in
.
X72-B
AA00-9270-00AAA-043B-A
Operation Manual
LP Selective catalytic reduction system
Winterthur Gas & Diesel Ltd.
- 120 -
Issue 003 2021-12
