Power plant controls
Introduction While it is theoretically possible to operate a boiler with manual control the operator must maintain a tedious, constant which for disturbances and variations of parameters. Time is needed for the boiler to respond to a correction and this lead to over correction with further upset to the boiler. An automatic controller once properly tuned will make the proper adjustment quickly to minimize upsets and will control the system more accurately and reliably. Instrumentation systems are provided for the boiler to achieve the following: 1. To measure the actual values of different parameters for which the boiler is designed. 2. Safe working range of the different parameters is maintained. 3. To monitor one or more variables at a time and provide input for automatic control. 4. In case of operator failure to take remedial action for an upset condition, it protects the boiler by alarms and trippings. 5. To provide data on operating conditions before failure of...