chapter - 1 introduction - Meghalaya State Pollution Control Board

Hills Cement Co. Limited.
XLPE insulated aluminum conductor screened & armored cable directly to 33
KV bus of the Substation.
The concept of the instrumentation system for the TG will also be similar to
that of traveling grate boiler. DCS will be provided for the following closed
loop controls:
¾ Hot well level control
¾ Gland steam pressure control
¾ Pressure and temperature control
The transmitters for the open loops of TG will also be wired to the main DCS
system. The protection and interlocking system of the turbine will also be
performed by the main DCS by connecting the field-mounted switches to the
DCS system.
The turbine will also be provided with the surface condenser, condensate
extraction pumps, and gland vent condenser. Governing system of the
turbine will be by electro hydraulic type to govern the turbine speed during
varying load demands the fluctuations. The speed governing system will limit
the over speed of the TG set on loss of full load to avoid tripping by the over
speed device.
The instrumentation and control system for the Atmospheric Fluidized Bed
Boiler and the turbo generator unit, etc., will be of electronic instruments with
pneumatic final control elements using the latest state of art of technology
viz., DCS system along with PC based automation system for monitoring and
control of the power plants from the control room. All the necessary
instruments required for proper operation of the plants will be provided.
The CPP is proposed to be operated in synchronous mode with Meghalaya
State Grid. The generated electrical power will be consumed in-house for the
existing cement plant and CPP auxiliaries’ power. The plant utility
requirements like compressed air, instrument air, water, etc., are all suitably
designed to meet the power plant requirement. The capacities of the
equipments used in this system have been considered with sufficient margins
to take care of these requirements.
WATER REQUIREMENT
Apart from steam generation, water is used as a cooling medium in the heat
exchanger equipments in power plant such as condensers, oil coolers,
generator air coolers etc. of turbo generator. Nearly 1,100 M 3 / day water
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