Steam Power Plants - PLC Automation & Control System

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PLC AUTOMATION & CONTROL SYSTEM FOR STEAM POWER PLANTS

A boiler installed for simple process steam requirements does not need much automation since small variations in steam pressure and temperature are negligible. However, when a boiler is installed for steam turbine, much more accuracy is required. Further, solid fuel used in boiler is much more complicated than liquid or gas fuels. Hence, complete automation system is installed for fuel handling, pressure regulation, flow of steam and steam turbine electrifications.

First of all, total automation layout for inputs and outputs of PLC is finalized in accordance with boiler design and size :

Fuel feeding to the furnace is automated through VFD installation and attached with boiler pressure & temperature. Pressure drop of steam increases fuel feeding and vice versa:

Thermocouples

Pressure Swithes

Parameteres Display

Boiler Feed Water Pumps are connected with boiler water level controllers through PLC to maximize boiler water tubes safety. FD fans, ID fans, dumpers and ash rotary motors are also controlled by centeral PLC. All these parameters are displayed in individual controllers along with central HMI for continuous monitoring:

Turbine panel is also integrated with main control system to monitor frequency, RPM, power and other factors:

Proper sized LT or HT cables connect power from turbine panel to industries main change over system:

The whole electric and electronic load of auxillary of the power plant is controlled while the generated power is sent to industry. Everything is monitored within main control room:

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