chapter - 1 introduction - Meghalaya State Pollution Control Board

Hills Cement Co. Limited.
Atmospheric Fluidized Bed Boiler
The power plant is envisaged with installation of atmospheric fluidized bed
boiler of 45 TPH steam capacity at a steam pressure of 67 ata and
temperature of 495 o C. The atmospheric fluidized bed boiler will meet the
steam requirement of the turbine of the power plant. The boiler will be of
single drum construction and will include the complete furnace, the super
heater, economizer, steam drum, air heater etc. The ash handling system
comprises of conveying the bed ash generated from the bottom of the
atmospheric Fluidized Bed boiler and the fly ash generated that economizer,
air heater and ESP. Bottom ash shall be manually disposed off and fly ash
shall be pneumatically. The boiler will also be provided with an electrostatic
precipitator to restrict the outlet dust concentration to 50 mg / Nm 3 . The
power will be provided with chimney of suitable height to take into
consideration the Pollution Control Board requirements.
The Atmospheric Fluidized Bed Boiler will be provided with necessary field
mounted gauges, switches, transmitters, I/P converters, pneumatically
operated control valves.
The transmitters and converters for the open loops and closed loops to
monitor and control the various process parameters of the boiler will be of
electronic type.
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Combustion control along with master pressure control
Drum level control (3 Element)
Super heater temperature control
Furnace draft control
Deaerator pressure control
Deaerator level control
The transmitters for the open loops to monitor the pressure, temperature,
flow and level at various points of the boiler will be directly connected to the
Analog Input Modules of the main DCS system and the signal will be
processed and displayed on the monitor.
Turbo – Generator
The steam generated from the boiler will be fed into 10 MW Turbo-
Generators. 10 MW Turbo-Generators will generate power at 11 KV, which
shall be stepped up to 33 KV through 16 MVA step up cum step down
transformer. Output of this 33 KV Switchgear will be connected by 33 / 19 KV
Pollution Control Consultants (India) Pvt. Ltd. 24