Boiler Equpement Interlock And Logic
Boiler Equpement Interlock And Logic
Bagasse and Coal base Travailing grate boiler
ID Fan Start / Stop
- If DCS mode (remote) selected.
- No ID fan stop command
- Furnace pressure no very low
If VFD mode is selected, ID fan start signal is initiated in DCS as a 5sec pulse. Within the 5sec if the ID fan running feedback signal is received by DCS then ID fan start signal gets latched & fan is running.
Incase of selection of 'SOFT STARTER' mode inlet damper shall be fully closed to enable starting. Once 'RUNNING' feedback is obtained the inlet damper can be opened.
FD FAN Start / Stop
FD fan shall be started from DCS if following Preconditions are fulfilled.
- DCS mode (remote) selected.
- Furnace pressure not very high.
- Drum level not very low.
- ID fan running condition.
- No FD fan stop command.
- If VFD mode is selected To start signal is initiated in DCS as a 5sec pulse. Within the 5sec if the FD fan running feedback signal is received by DCS then FD fan start signal gets latched & fan is running.
- If Soft Starter mode is selected the inlet damper shall be fully closed to enable starting. Once 'FAN RUNNING' feedback is obtained damper can be opened.
SA Fan Start / Stop
SA fan shall be started from DCS if following Preconditions are fulfilled.
- DCS mode (remote) selected.
- Drum level not very low.
- ID fan running condition.
- FD fan running condition.
- No SA fan stop command.
- If VFD mode is selected To start signal is initiated in DCS as a 5sec pulse. Within the 5sec if the SA fan running feedback signal is received by DCS then SA fan start signal gets latched & fan is running.
- If Soft Starter mode is selected the inlet damper shall be fully closed to enable starting. Once 'FAN RUNNING' feedback is obtained damper can be opened.
Screw (Fuel) Feeder Start / Stop
The bagasse screw feeder can be started from DCS if following Preconditions are fulfilled.
- SA fan is on mode.
- DCS mode selected from MCC.
- No screw feeder stop command.
Drum (Fuel) Feeder Start / Stop
- DCS mode (remote) selected.
- ID fan running condition.
- FD fan running condition.
- SA fan running condition.
- Corresponding screw feeder running.
- Drum level not very low
- No Drum feeder stop command.
Coal Spreader Start / Stop
- DCS mode selected from MCC.
- No Coal spreader stop command.
Coal Feeder Start / Stop
The Coal Feeder can be started from DCS if following Preconditions are fulfilled.
- DCS mode (remote) selected.
- ID fan running condition.
- FD fan running condition.
- SA fan running condition.
- Corresponding Coal Spreader running.
- Drum level not very low
- No Coal feeder stop command.
Boiler Feed Water Pump (BFP) Start / Stop
The Boiler Feed water Pump (BFP) shall be started from DCS if following Preconditions are fulfilled.
- DCS selected.
- Deareator level not low.
- No stop command.
Main Steam Stop Valve (MSSV) Open
Main Steam Stop valve can be opened if following Preconditions are fulfilled.
- MSSV remote selected.
- MSSV bypass valve is open.
- MSSV not fully open.
- No MSSV close command present.
Main Steam Stop Valve (MSSV) Close
Main Steam Stop valve can be Closed if following Preconditions are fulfilled.
- MSSV remote selected.
- MSSV not fully closed.
- No MSSV open command present.
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