In the FBC boiler air or gas is passed through an inert bed of solid particles
with high velocity.The air bubles through the bed and particles attain state of
high turbulence. The bed assumes the appearance of a fluid and is then heated
to ignition temperature of fuel.
The fuel burns rapidly and the bed attains a uniform temperature due to
effective mixing. The temperature of fuel should never be allowed to approach
ash fusion temperature due to effective mixing. The temperature of fuel should
never be allowed to approach ash fusion temperature to avoid melting of ash.
This is achieved by conductive and convective heat transfer through tubes
immersed in the bed. The Steam from WHRSG and FBC is brought to turbine through
ESV .
Turbine Control & Protection (Automatic)
 |
Latest state of the art Microprocessor based fault tolerant
systeminstalled for controlling the operation and safety of the turbine. |
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Triple Modular Redundant (TMR) PLC system of Triconex Corporation USA helps in
monitoring and controlling important process parameters. |
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During critical process condition, turbine control is taken over by Automation
till process is normalised |
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Human machine interface and the data acquisition are through the SCADA system. |
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System is having 100 milliseconds cycle time. |
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Power is supplied to the automation system through a dual redundant UPS system |
Generator Control & Protection
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Generator excitation is controlled by a micro processor based ultra
fast IGBT powered AVR within cycle time of 400 milliseconds supplied by M/S CKD
Czech Republic. |
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Generator protection is achieved by multi functional microprocessor based
programmable relays of Siemens, Germany. |
Boiler Control & Protection
Controllers and the hot redundant PLC system of Simens are
installed for automatic drum level control and combustion control of the FBC. |
