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In short - for an efficient, reliable, and safe boiler operation, there is a need of basic instrumentation.
1. Safe sequence of motors and control devices.
2. Air fuel ratio control. Fuel measurement meter.
3. Inlet water flow measurement and control to maintain safe water level. Mobrey switch or suitable level switch or transmitter. Water flow meter.
4. Differential steam pressure control - pressure switch or pressure transmitter.
5. Firing sequence controller.Purging sequence. Flame detection and ignition control.
6. Two element or three element water level control method.
7. Safety valves.
8. Fuel tank level control if not gas used.
9. Dearator level control, deareator pressure / temp control
10. Alarm and trip limits and control
11. Suitable control cabinet with PLC or hardwired logic and devices and suitable user interface / HMI
12. Exhaust temp, and other sox, nox measurement.
13. Blow down method and control.
14. Intet water quality monitoring and control.
If coal or bio mass used there will more add on instrumentation and control necessary.
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